Active matrix display device, its driving method, and display element

• US 20020154084A1
• Filed: 02/13/2002
• Published: 10/24/2002
• Est. Priority Date: 06/16/2000
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Tanaka, Yukio, Kimura, Masanori, Kumagawa, Katsuhiko, Komori, Kazunori
• Granted Patent: US 6,963,335 B2
• Time in Patent Office: Days
• US Class Current: 345/92
• CPC Class Codes: G02F 1/133388 with constructional differences between the display region and the peripheral region
• CPC Class Codes: G02F 1/134336 Matrix
• CPC Class Codes: G02F 1/136213 Storage capacitors associated with the pixel electrode
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 2320/0209 Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
• CPC Class Codes: G09G 2320/0219 Reducing feedthrough effects in active matrix panels, i.e. voltage changes on the scan electrode influencing the pixel voltage due to capacitive coupling
• CPC Class Codes: G09G 2320/0223 Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
• CPC Class Codes: G09G 2320/0247 Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 3/3655 Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
• CPC Class Codes: G09G 3/3659 the addressing of the pixel involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependant on signal of two data electrodes

Abstract

An active matrix type display apparatus is provided that is inexpensive, has less crosstalk, has no flickering and a brightness gradient, and is suitable for a large screen size. The display apparatus includes a plurality of pixel electrodes arranged in a matrix, switching elements (TFTs) connected thereto, scanning electrodes, video signal electrodes, common electrodes, and a counter electrode, wherein liquid crystal, for example, is interposed between the pixel electrodes and the counter electrode. Assuming that a gate-drain capacitance is C_gd, a common electrode-pixel electrode capacitance is C_st, and the total capacitance connected to the pixel electrodes is C_tot in this configuration, α_gd and α_st represented by α_gd=C_gd/C_tot, α_st=C_st/C_tot are set to be different values between a portion close to feeding ends in a screen and a portion away therefrom.

Claims

1. A display apparatus, comprising:

a plurality of pixel electrodes arranged in a matrix;

switching elements connected thereto;

scanning electrodes;

video signal electrodes;

common electrodes;

a counter electrode;

a display medium interposed between the pixel electrodes and the counter electrode; and

storage capacitance formed between the pixel electrodes and the common electrodes,

wherein, in a case where a scanning electrode-pixel electrode capacitance between the pixel electrodes and the scanning electrodes is represented by C_gd, a common electrode-pixel electrode capacitance between the pixel electrodes and the common electrodes is represented by C_st, and a total capacitance connected electrically to the pixel electrodes is represented by C_tot,

α

_gd and α

_st represented by

α

_gd=C_gd/C_tot, α

_st=C_st/C_tot 

 

(Formula

     1)

are set to be different values between a portion close to feeding ends in a screen and a portion away therefrom.

2. A display apparatus according to claim 1, comprising a video signal driving circuit for applying two kinds of video signals having different polarities to video signal electrodes in accordance with a display period.

3. A display apparatus according to claim 2, comprising a common electrode potential control circuit for applying a voltage signal to a plurality of common electrodes and a scanning signal driving circuit for applying a voltage signal to a plurality of scanning electrodes, the common electrode potential control circuit has output potential levels of at least two values, and the scanning signal driving circuit has output potential levels of at least two values.

4. A display apparatus according to claim 3, wherein a potential of a scanning electrode becomes a first potential level V_gon when the scanning electrode is selected and becomes substantially a second potential level V_goff during a retention period in which the scanning electrode is not selected,

a potential of a common electrode that is a connection destination of storage capacitance connected to pixel electrodes of a plurality of pixels belonging to the scanning electrode becomes a first potential level V_c(+) in a case where a polarity of a video signal is positive and a second potential level V_c(−

) in a case where the polarity of the video signal is negative, when the scanning electrode is selected, and

in a case where a difference between the first potential level V_c(+) of the common electrode and a potential during a subsequent retention period is represented by Δ

V_c(+), and a difference between the second potential level V_c(−

) of the common electrode and a potential during a subsequent retention period is represented by Δ

V_c(−

),

γ

represented by

γ

=α

_stV_cp/2 

 

(Formula

     2)(where V_cp=Δ

V_c(+)−

Δ

V_c(−

) 

 

(Formula

     3))

is set to be smaller in the portion away from the feeding ends in the screen, compared with the portion close thereto.

5. A display apparatus according to claim 4, wherein, assuming that a value of γ

in the portion close to the feeding ends in the screen is γ

(O), a value of γ

in the portion away from the feeding ends in the screen is γ

(E), and a value of γ

in a portion in a middle therebetween in terms of a distance is γ

(M), γ

(M) is smaller than [γ

(O)+γ

(E)]/2.

6. A display apparatus according to claim 4, wherein V_cp takes a negative value.

7. A display apparatus according to claim 3, wherein a potential of a scanning electrode becomes a first potential level V_gon when the scanning electrode is selected and becomes substantially a second potential level V_goff during a retention period in which the scanning electrode is not selected,

a potential of a common electrode that is a connection destination of storage capacitance connected to pixel electrodes of a plurality of pixels belonging to the scanning electrode becomes a first potential level V_c(+) in a case where a polarity of a video signal is positive and a second potential level V_c(−

) in a case where the polarity of the video signal is negative, when the scanning electrode is selected, and

in a case where a difference between the first potential level V_c(+) of the common electrode and a potential during a subsequent retention period is represented by Δ

V_c(+), and a difference between the second potential level V_c(−

) of the common electrode and a potential during a subsequent retention period is represented by Δ

V_{0 (-),}

β

represented by

β

=α

_gd+α

_st(Δ

V_cc/V_gon) 

 

(Formula

     4)(where Δ

V_gon=V_gon−

V_goff, Δ

V_cc=[Δ

V_c(+)+Δ

V_c(−

)]/2 

 

(Formula

     5))

is set to be larger in the portion away from the feeding ends in the screen, compared with the portion close thereto.

8. A display apparatus according to claim 7, wherein, assuming that a value of β

in the portion close to the feeding ends in the screen is β

(O), a value of β

in the portion away from the feeding ends in the screen is β

(E), and a value of β

in a portion in a middle therebetween in terms of a distance is β

(M), β

(M) is larger than [β

(O)+β

(E)]/2.

9. A display apparatus according to claim 7, wherein Δ

V_cc is negative.

10. A display apparatus according to claim 3, wherein a potential of a scanning electrode becomes a first potential level V_gon when the scanning electrode is selected and becomes substantially a second potential level V_goff during a retention period in which the scanning electrode is not selected,

a potential of a common electrode that is a connection destination of storage capacitance connected to pixel electrodes of a plurality of pixels belonging to the scanning electrode becomes a first potential level V_c(+) in a case where a polarity of a video signal is positive and a second potential level V_c(−

) in a case where the polarity of the video signal is negative, when the scanning electrode is selected,

in a case where a difference between the first potential level V_c(+) of the common electrode and a potential during a subsequent retention period is represented by Δ

V_c(+), and a difference between the second potential level V_c(−

) of the common electrode and a potential during a subsequent retention period is represented by Δ

V_c(−

),

γ

represented by

γ

=α

_stV_cp/2 

 

(Formula

     2)(where V_cp=Δ

V_c(+)−

Δ

V_c(−

) 

 

(Formula

     3))

is set to be smaller in the portion away from the feeding ends in the screen, compared with the portion close thereto, and

β

represented by

β

=α

_gd+α

_st(Δ

V_cc/Δ

V_gon) 

 

(Formula

     4)(where Δ

V_gon=V_gon−

V_goff, Δ

V_cc=[Δ

V_c(+)+Δ

V_c(−

)]/2 

 

(Formula

     5))

is set to be larger in the portion away from the feeding ends in the screen, compared with the portion close thereto.

43. A display apparatus according to claim 1 or 11, wherein the display medium is liquid crystal.

44. A display apparatus according to claim 43, which has a configuration forming a parallel plate capacitance in which a liquid crystal layer is interposed between the pixel electrodes and the counter electrode.

46. A display apparatus according to claim 45, wherein the common electrodes are formed on the same substrate as that of the pixel electrodes, and the liquid crystal is operated by an electric field parallel to the substrate.

47. A display apparatus according to claim 1, 11, 22, or 32, wherein at least one of capacitances forming C_tot includes a capacitance formed by two conductive layers or semiconductor layers sandwiching an insulating layer therebetween, and an overlapping area of the two conductive layers or semiconductor layers is made different between the portion close to the feeding ends in the screen and the portion away therefrom, whereby α

_st or α

_lc, and α

_gd are allowed to have different values between the portion close to the feeding ends in the screen and the portion away therefrom.

48. A method for driving the display apparatus of claim 1 or 11, wherein after a potential is written to the pixel electrodes via the switching elements, a voltage is superimposed via C_st and has a value different between the portion close to the feeding ends in the screen and the portion away therefrom.

49. A method for driving a display apparatus according to claim 48, wherein, when a scanning electrode is selected, a first potential level V_c(+) is applied to common electrodes that are connection destinations of storage capacitance connected to pixel electrodes of a plurality of pixels belonging to the scanning electrode in a case where a polarity of a video signal is positive, and a second potential level V_c(−

) is applied thereto in a case where a polarity of the video signal is negative.

64. A display apparatus according to claim 4, 7, 10, 15, 18, 21, 25, 28, 31, 36, 39, or 42, wherein a common electrode potential is different between a retention period after the pixel electrodes are charged with a positive video signal and a retention period after the pixel electrodes are charged with a negative video signal.

68. A display apparatus according to claim 1, 11, 22, or 32, wherein the display medium is composed of a medium whose optical state is controlled with a current and auxiliary switching elements.

11. A display apparatus, comprising:

a plurality of pixel electrodes arranged in a matrix;

switching elements connected thereto;

scanning electrodes;

video signal electrodes;

common electrodes;

a counter electrode;

a display medium interposed between the pixel electrodes and the counter electrode; and

storage capacitance formed between the pixel electrodes and the common electrodes, a plurality of the common electrodes that are connection destinations of the storage capacitance being connected to the pixel electrodes of a plurality of pixels belonging to one of the scanning electrodes,

wherein, in a case where a scanning electrode-pixel electrode capacitance between the pixel electrodes and the scanning electrodes is represented by C_gd, a common electrode-pixel electrode capacitance between the pixel electrodes and the common electrodes is represented by C_st, and a total capacitance connected electrically to the pixel electrodes is represented by C_tot,

α

_gd and α

_st represented by

α

_gd=C_gd/C_tot, α

_st=C_st/C_tot 

 

(Formula

     1)

are set to be different values between a portion close to feeding ends in a screen and a portion away therefrom.

12. A display apparatus according to claim 11, comprising a video signal driving circuit for simultaneously applying two kinds of video signals having different polarities to a plurality of video signal electrodes, and applying two kinds of video signals having different polarities to each of the video signal electrodes in accordance with a display period.

13. A display apparatus according to claim 12, comprising a first common electrode that is a connection destination of storage capacitance connected to pixel electrodes of pixels belonging to a video signal electrode to which a video signal with a first polarity is applied among a plurality of pixels belonging to one of the scanning electrodes, and a second common electrode that is different from the first common electrode and is a connection destination of the storage capacitance connected to the pixel electrodes of the pixels belonging to the video signal electrode to which the video signal with a second polarity is applied.

14. A display apparatus according to claim 13, comprising a common electrode potential control circuit for applying a voltage signal to a plurality of common electrodes and a scanning signal driving circuit for applying a voltage signal to a plurality of scanning electrodes, the common electrode potential control circuit has output potential levels of at least two values, and the scanning signal driving circuit has output potential levels of at least two values.

15. A display apparatus according to claim 14, wherein a potential of a scanning electrode becomes a first potential level V_gon when the scanning electrode is selected and becomes substantially a second potential level V_goff during a retention period in which the scanning electrode is not selected,

among common electrodes that are connection destinations of storage capacitance connected to pixel electrodes of a plurality of pixels belonging to the scanning electrode,

a potential of the first common electrode becomes a first potential level V_c(+) in a case where a polarity of a video signal applied to a video signal electrode corresponding to the first common electrode is positive and a second potential level V_c(−

) in a case where the polarity of the video signal is negative, when the scanning electrode is selected,

a potential of the second common electrode becomes a first potential level V_c(+) in a case where the polarity of the video signal applied to the video signal electrode corresponding to the second common electrode is positive and a second potential level V_c(−

) in a case where the polarity of the video signal is negative, when the scanning electrode is selected, and

in a case where a difference between the first potential level V_c(+) of the common electrode and a potential during a subsequent retention period is represented by Δ

V_c(+), and a difference between the second potential level V_c(−

) of the common electrode and a potential during a subsequent retention period is represented by Δ

V_c (−

),

γ

represented by

γ

=α

_stV_cp/2 

 

(Formula

     2)(where V_cp=Δ

V_c(+)−

Δ

V_c(−

) 

 

(Formula

     3))

is set to be smaller in the portion away from the feeding ends in the screen, compared with the portion close thereto.

16. A display apparatus according to claim 15, wherein, assuming that a value of γ

in the portion close to the feeding ends in the screen is γ

(O), a value of γ

in the portion away from the feeding ends in the screen is γ

(E), and a value of γ

in a portion in a middle therebetween in terms of a distance is γ

(M), γ

(M) is smaller than [γ

(O)+γ

(E)]/2.

17. A display apparatus according to claim 15, wherein V_cp is negative.

18. A display apparatus according to claim 14, wherein a potential of a scanning electrode becomes a first potential level V_gon when the scanning electrode is selected and becomes substantially a second potential level V_goff during a retention period in which the scanning electrode is not selected,

among common electrodes that are connection destinations of storage capacitance connected to pixel electrodes of a plurality of pixels belonging to the scanning electrodes,

a potential of the first common electrode becomes a first potential level V_c(+) in a case where a polarity of a video signal applied to a video signal electrode corresponding to the first common electrode is positive and a second potential level V_c(−

) in a case where the polarity of the video signal is negative, when the scanning electrode is selected,

a potential of the second common electrode becomes a first potential level V_c(+) in a case where the polarity of the video signal applied to the video signal electrode corresponding to the second common electrode is positive and a second potential level V_c(−

) in a case where the polarity of the video signal is negative, when the scanning electrode is selected, and

in a case where a difference between the first potential level V_c(+) of the common electrode and a potential during a subsequent retention period is represented by Δ

V_c(+), and a difference between the second potential level V_c(−

) of the common electrode and a potential during a subsequent retention period is represented by Δ

V_c(−

),

β

represented by

β

=α

_gd+α

_st(Δ

V_cc/Δ

V_gon) 

 

(Formula

     4)(where Δ

V_gon=V_gon−

V_goff, Δ

V_cc=[Δ

V_c(+)+Δ

V_c(−

)]/2 

 

(Formula

     5))

is set to be larger in the portion away from the feeding ends in the screen, compared with the portion close thereto.

19. A display apparatus according to claim 18, wherein, assuming that a value of β

in the portion close to the feeding ends in the screen is β

(O), a value of β

in the portion away from the feeding ends in the screen is β

(E), and a value of β

in a portion in a middle therebetween in terms of a distance is β

(M), β

(M) is larger than [β

(O)+β

(E)]/2.

20. A display apparatus according to claim 18, wherein Δ

V_cc is negative.

21. A display apparatus according to claim 14, wherein a potential of a scanning electrode becomes a first potential level V_gon when the scanning electrode is selected and becomes substantially a second potential level V_goff during a retention period in which the scanning electrode is not selected,

among common electrodes that are connection destinations of storage capacitance connected to pixel electrodes of a plurality of pixels belonging to the scanning electrodes,

a potential of the first common electrode becomes a first potential level V_c(+) in a case where a polarity of a video signal applied to a video signal electrode corresponding to the first common electrode is positive and a second potential level V_c(−

) in a case where the polarity of the video signal is negative, when the scanning electrode is selected,

a potential of the second common electrode becomes a first potential level V_c(+) in a case where the polarity of the video signal applied to the video signal electrode corresponding to the second common electrode is positive and a second potential level V_c(−

) in a case where the polarity of the video signal is negative, when the scanning electrode is selected,

in a case where a difference between the first potential level V_c(+) of the common electrode and a potential during a subsequent retention period is represented by Δ

V_c(+), and a difference between the second potential level V_c(−

) of the common electrode and a potential during a subsequent retention period is represented by Δ

V_c(−

),

γ

represented by

γ

=α

_stV_cp/2 

 

(Formula

     2)(where V_cp=Δ

V_c(+)−

Δ

V_c 

 

(Formula

     3))

is set to be smaller in the portion away from the feeding ends in the screen, compared with the portion close thereto, and

β

represented by

β

=α

_gd+α

_st(Δ

V_cc/Δ

V_gon) 

 

(Formula

     4)(where Δ

V_gon=V_gon−

V_goff, Δ

V_cc =[Δ

V_c(+)+Δ

V_c(−

)]/2 

 

(Formula

     5))

is set to be larger in the portion away from the feeding ends in the screen, compared with the portion close thereto.

65. A display apparatus according to claim 3, 14, 24, or 35, wherein the scanning signal driving circuit conducts writing to a plurality of lines simultaneously.

66. A display apparatus according to claim 65, wherein the display medium is liquid crystal of an OCB mode.

67. A display apparatus according to claim 3, 14, 24, or 35, wherein the scanning signal driving circuit and the common electrode potential control circuit are formed on the same substrate as that of the switching elements.

69. A display apparatus according to claim 68, wherein the medium whose optical state is controlled with a current is an organic electroluminescence medium.

22. A display apparatus, comprising:

a plurality of pixel electrodes arranged in a matrix;

switching elements connected thereto;

scanning electrodes;

video signal electrodes;

common electrodes;

a display medium interposed between the pixel electrodes and the common electrodes; and

storage capacitance formed between electrodes, other than the common electrodes opposing the pixel electrodes via the display medium and the scanning electrodes of the stage concerned, and the pixel electrodes,

wherein, in a case where a scanning electrode-pixel electrode capacitance between the pixel electrodes and the scanning electrodes is represented by C_gd, a common electrode-pixel electrode capacitance between the pixel electrodes and the common electrodes is represented by C_lc, and a total capacitance connected electrically to the pixel electrodes is represented by C_tot,

α

_gd and α

_lc represented by

α

_gd=C_gd/C_tot, α

_lc=C_lc/C_tot 

 

(Formula

     6)

are set to be different values between a portion close to feeding ends in a screen and a portion away therefrom.

23. A display apparatus according to claim 22, comprising a video signal driving circuit for applying two kinds of video signals having different polarities to video signal electrodes in accordance with a display period.

24. A display apparatus according to claim 23, comprising a common electrode potential control circuit for applying a voltage signal to a plurality of common electrodes and a scanning signal driving circuit for applying a voltage signal to a plurality of scanning electrodes, the common electrode potential control circuit has output potential levels of at least two values, and the scanning signal driving circuit has output potential levels of at least two values.

25. A display apparatus according to claim 24, wherein a potential of a scanning electrode becomes a first potential level V_gon when the scanning electrode is selected and becomes substantially a second potential level V_goff during a retention period in which the scanning electrode is not selected,

a potential of a common electrode that opposes pixel electrodes of a plurality of pixels belonging to the scanning electrode via the display medium becomes a first potential level V_c(+) in a case where a polarity of a video signal is positive and a second potential level V_c(−

) in a case where the polarity of the video signal is negative, when the scanning electrode is selected, and

in a case where a difference between the first potential level V_c(+) of the common electrode and a potential during a subsequent retention period is represented by Δ

V_c(+), and a difference between the second potential level V_c(−

) of the common electrode and a potential during a subsequent retention period is represented by Δ

V_c(−

),

γ

represented by

γ

=α

_lcV_cp/2 

 

(Formula

     7)(where V_cp=Δ

V_c(+)−

Δ

V_c(−

) 

 

(Formula

     8))

is set to be smaller in the portion away from the feeding ends in the screen, compared with the portion close thereto.

26. A display apparatus according to claim 25, wherein, assuming that a value of γ

in the portion dose to the feeding ends in the screen is γ

(O), a value of γ

in the portion away from the feeding ends in the screen is γ

(E), and a value of γ

in a portion in a middle therebetween in terms of a distance is γ

(M), γ

(M) is smaller than [γ

(O)+γ

(E)]/2.

27. A display apparatus according to claim 25, wherein V_cp is negative.

28. A display apparatus according to claim 24, wherein a potential of a scanning electrode becomes a first potential level V_gon when the scanning electrode is selected and becomes substantially a second potential level V_goff during a retention period in which the scanning electrode is not selected,

a potential of a common electrode that opposes pixel electrodes of a plurality of pixels belonging to the scanning electrodes via the display medium becomes a first potential level V_c(+) in a case where a polarity of a video signal is positive and a second potential level V_c(−

) in a case where the polarity of the video signal is negative, when the scanning electrode is selected, and

in a case where a difference between the first potential level V_c(+) of the common electrode and a potential during a subsequent retention period is represented by Δ

V_c(+), and a difference between the second potential level V_c(−

) of the common electrode and a potential during a subsequent retention period is represented by Δ

V_c(−

),

β

represented by

β

=α

_gd+α

_lc(Δ

V_cc/Δ

V_gon) 

 

(Formula

     9)(where Δ

V_gon=V_gon−

V_goff, Δ

V_cc=[Δ

V_c(+)+Δ

V_c(−

)]/2 

 

(Formula

     10))

is set to be larger in the portion away from the feeding ends in the screen, compared with the portion close thereto.

29. A display apparatus according to claim 28, wherein, assuming that a value of β

in the portion close to the feeding ends in the screen is β

(O), a value of β

in the portion away from the feeding ends in the screen is β

(E), and a value of β

in a portion in a middle therebetween in terms of a distance is β

(M), β

(M) is larger than [β

(O)+β

(E)]/2.

30. A display apparatus according to claim 28, wherein Δ

V_cc is negative.

31. A display apparatus according to claim 24, wherein a potential of a scanning electrode becomes a first potential level V_gon when the scanning electrode is selected and becomes substantially a second potential level V_goff during a retention period in which the scanning electrode is not selected,

a potential of a common electrode that opposes pixel electrodes of a plurality of pixels belonging to the scanning electrode via the display medium becomes a first potential level V_c(+) in a case where a polarity of a video signal is positive and a second potential level V_c(−

) in a case where the polarity of the video signal is negative, when the scanning electrode is selected,

in a case where a difference between the first potential level V_c(+) of the common electrode and a potential during a subsequent retention period is represented by Δ

V_c(+), and a difference between the second potential level V_c(−

) of the common electrode and a potential during a subsequent retention period is represented by Δ

V_c(−

),

γ

represented by

γ

=α

_lcV_cp/2 

 

(Formula

     7)(where V_cp=Δ

V_c(+)−

Δ

V_c(−

) 

 

(Formula

     8))

is set to be smaller in the portion away from the feeding ends in the screen, compared with the portion close thereto, and

β

represented by

β

=α

_gd+α

_lc(Δ

V_cc/Δ

V_gon ) 

 

(Formula

     9)(where Δ

V_gon=V_gon−

V_goff, Δ

V_cc =[Δ

V_c(+)+Δ

V_c(−

)]/2 

 

(Formula

     10))

is set to be larger in the portion away from the feeding ends in the screen, compared with the portion close thereto.

45. A display apparatus according to claim 22 or 32, wherein the display medium is liquid crystal.

50. A method for driving a display apparatus according to claim 22 or 32, wherein after a potential is written to the pixel electrodes via the switching elements, a voltage is superimposed via C_st and has a value different between the portion close to the feeding ends in the screen and the portion away therefrom.

51. A method for driving a display apparatus according to claim 50, wherein, when a scanning electrode is selected, a first potential level V_c(+) is applied to common electrodes opposing pixel electrodes of a plurality of pixels belonging to the scanning electrode via a display medium in a case where a polarity of a video signal is positive, and a second potential level V_c(−

) is applied thereto in a case where a polarity of the video signal is negative.

32. A display apparatus, comprising:

a plurality of pixel electrodes arranged in a matrix;

switching elements connected thereto;

scanning electrodes;

video signal electrodes;

common electrodes;

a display medium interposed between the pixel electrodes and the common electrodes; and

storage capacitance formed between electrodes, other than the common electrodes opposing the pixel electrodes via the display medium and the scanning electrodes of the stage concerned, and the pixel electrodes, a plurality of the common electrodes opposing the pixel electrodes of a plurality of pixels belonging to one of the scanning electrodes via the display medium,

wherein, in a case where a scanning electrode-pixel electrode capacitance between the pixel electrodes and the scanning electrodes is represented by C_gd, a common electrode-pixel electrode capacitance between the pixel electrodes and the common electrodes is represented by C_lc, and a total capacitance connected electrically to the pixel electrodes is represented by C_tot,

α

_gd and α

_lc represented by

α

_gd=C_gd/C_tot, α

_lc=C_lc/C_tot 

 

(Formula

     6)

are set to be different values between a portion close to feeding ends in a screen and a portion away therefrom.

33. A display apparatus according to claim 32, comprising a video signal driving circuit for simultaneously applying two kinds of video signals having different polarities to a plurality of video signal electrodes, and applying two kinds of video signals having different polarities to each of the video signal electrodes in accordance with a display period.

34. A display apparatus according to claim 33, comprising a first common electrode that opposes, via the display medium, pixel electrodes of pixels belonging to a video signal electrode to which a video signal with a first polarity is applied among a plurality of pixels belonging to one of the scanning electrodes, and a second common electrode that is different from the first common electrode and opposes, via the display medium, the pixel electrodes of the pixels belonging to the video signal electrode to which the video signal with a second polarity is applied.

35. A display apparatus according to claim 34, comprising a common electrode potential control circuit for applying a voltage signal to a plurality of common electrodes and a scanning signal driving circuit for applying a voltage signal to a plurality of scanning electrodes, and the common electrode potential control circuit has output potential levels of at least two values, and the scanning signal driving circuit has output potential levels of at least two values.

36. A display apparatus according to claim 35, wherein a potential of a scanning electrode becomes a first potential level V_gon when the scanning electrode is selected and becomes substantially a second potential level V_goff during a retention period in which the scanning electrode is not selected,

among common electrodes opposing pixel electrodes of a plurality of pixels belonging to the scanning electrode via a display medium,

a potential of the first common electrode becomes a first potential level V_c(+) in a case where a polarity of a video signal applied to a video signal electrode corresponding to the first common electrode is positive and a second potential level V_c(−

) in a case where the polarity of the video signal is negative, when the scanning electrode is selected,

a potential of the second common electrode becomes a first potential level V_c(+) in a case where a polarity of the video signal applied to the video signal electrode corresponding to the second common electrode is positive and a second potential level V_c(−

) in a case where the polarity of the video signal is negative, when the scanning electrode is selected, and

in a case where a difference between the first potential level V_c(+) of the common electrode and a potential during a subsequent retention period is represented by Δ

V_c(+), and a difference between the second potential level V_c(−

) of the common electrode and a potential during a subsequent retention period is represented by Δ

V_c(−

),

γ

represented by

γ

=α

_lcV_cp/2 

 

(Formula

     7)(where V_cp=Δ

V_c(+)−

Δ

V_c(−

) 

 

(Formula

     8))

is set to be smaller in the portion away from the feeding ends in the screen, compared with the portion close thereto.

37. A display apparatus according to claim 36, wherein, assuming that a value of γ

in the portion close to the feeding ends in the screen is γ

(O), a value of γ

in the portion away from the feeding ends in the screen is γ

(E), and a value of γ

in a portion in a middle therebetween in terms of a distance is γ

(M), γ

(M) is smaller than [γ

(O)+γ

(E)]/2.

38. A display apparatus according to claim 36, wherein V_cp is negative.

39. A display apparatus according to claim 35, wherein a potential of a scanning electrode becomes a first potential level V_gon when the scanning electrode is selected and becomes substantially a second potential level V_goff during a retention period in which the scanning electrode is not selected,

among common electrodes opposing pixel electrodes of a plurality of pixels belonging to the scanning electrode via a display medium,

a potential of the first common electrode becomes a first potential level V_c(+) in a case where a polarity of a video signal applied to a video signal electrode corresponding to the first common electrode is positive and a second potential level V_c(−

) in a case where the polarity of the video signal is negative, when the scanning electrode is selected,

a potential of the second common electrode becomes a first potential level V_c(+) in a case where a polarity of the video signal applied to the video signal electrode corresponding to the second common electrode is positive and a second potential level V_c(−

) in a case where the polarity of the video signal is negative, when the scanning electrode is selected, and

in a case where a difference between the first potential level V_c(+) of the common electrode and a potential during a subsequent retention period is represented by Δ

V_c(+), and a difference between the second potential level V_c(−

) of the common electrode and a potential during a subsequent retention period is represented by Δ

V_c(−

),

β

represented by

β

=α

_gd+α

_lc(Δ

V_cc/Δ

V_gon) 

 

(Formula

     9)(where Δ

V_gon=V_gon−

V_goff, Δ

V_cc=[Δ

V_c(+)+Δ

V_c(−

)]/2 

 

(Formula

     10))

is set to be larger in the portion away from the feeding ends in the screen, compared with the portion close thereto.

40. A display apparatus according to claim 39, wherein, assuming that a value of β

in the portion close to the feeding ends in the screen is β

(O), a value of β

in the portion away from the feeding ends in the screen is β

(E), and a value of β

in a portion in a middle therebetween in terms of a distance is β

(M), β

(M) is larger than [β

(O)+β

(E)]/2.

41. A display apparatus according to claim 39, wherein Δ

V_cc is negative.

42. A display apparatus according to claim 35, wherein a potential of a scanning electrode becomes a first potential level V_gon when the scanning electrode is selected and becomes substantially a second potential level V_goff during a retention period in which the scanning electrode is not selected,

among common electrodes opposing pixel electrodes of a plurality of pixels belonging to the scanning electrode via a display medium,

a potential of the first common electrode becomes a first potential level V_c(+) in a case where a polarity of a video signal applied to a video signal electrode corresponding to the first common electrode is positive and a second potential level V_c(−

) in a case where the polarity of the video signal is negative, when the scanning electrode is selected,

a potential of the second common electrode becomes a first potential level V_c(+) in a case where a polarity of the video signal applied to the video signal electrode corresponding to the second common electrode is positive and a second potential level V_c(−

) in a case where the polarity of the video signal is negative, when the scanning electrode is selected,

in a case where a difference between the first potential level V_c(+) of the common electrode and a potential during a subsequent retention period is represented by Δ

V_c(+), and a difference between the second potential level V_c(−

) of the common electrode and a potential during a subsequent retention period is represented by Δ

V_c(−

),

γ

represented by

γ

=α

_lcV_cp/2 

 

(Formula

     7)(where V_cp=Δ

V_c(+)−

Δ

V_c(−

) 

 

(Formula

     8))

is set to be smaller in the portion away from the feeding ends in the screen, compared with the portion close thereto, and

β

0 represented by

β

=α

_gd+α

_lc(Δ

V_cc/Δ

V_gon) 

 

(Formula

     9)(where Δ

V_gon=V_gon−

V_goff, Δ

V_cc=[Δ

V_c(+)+Δ

V_c(−

)]/2 

 

(Formula

     10))

is set to be larger in the portion away from the feeding ends in the screen, compared with the portion close thereto.

52. A display apparatus for conducting a display by controlling a voltage applied to a display medium with a potential of pixel electrodes and applying voltages with both positive and negative polarities to the display medium,

wherein a capacitive coupling voltage is superimposed on the pixel electrodes from electrodes other than pixel electrodes, and a distribution of the capacitive coupling voltage is made different in a display region between a case where a positive voltage is applied to the display medium and a case where a negative voltage is applied thereto.

53. A display apparatus according to claim 52, wherein the electrodes other than the pixel electrodes are common electrodes.

54. A display apparatus comprising:

a plurality of pixel electrodes arranged in a matrix;

switching elements connected thereto;

scanning electrodes, video signal electrodes;

common electrodes;

a counter electrode;

a display medium interposed between the pixel electrodes and the counter electrodes; and

storage capacitance formed between the pixel electrodes and the common electrodes,

wherein a capacitive coupling voltage from the scanning electrode, and a capacitive coupling voltage from the common electrode are allowed to have a distribution in a screen, whereby flickering and a brightness gradient are corrected simultaneously.

55. A display apparatus, comprising:

a plurality of pixel electrodes arranged in a matrix;

switching elements connected thereto;

scanning electrodes, video signal electrodes;

common electrodes;

a display medium interposed between the pixel electrodes and the common electrodes; and

storage capacitance formed between electrodes, other than the common electrodes opposing the pixel electrodes via the display medium and the scanning electrodes of the stage concerned, and the pixel electrodes,

wherein a capacitive coupling voltage from the scanning electrode, and a capacitive coupling voltage from the common electrode are allowed to have a distribution in a screen, whereby flickering and a brightness gradient are corrected simultaneously.

56. A display apparatus, comprising:

a plurality of pixel electrodes arranged in a matrix;

switching elements connected thereto;

scanning electrodes, video signal electrodes;

common electrodes;

a counter electrode;

a display medium interposed between the pixel electrodes and the counter electrode; and

storage capacitance formed between the pixel electrodes and either of the common electrodes,

wherein a plurality of the common electrodes that are connection destinations of the storage capacitance are connected to the pixel electrodes of a plurality of pixels belonging to one of the scanning electrodes.

57. A display apparatus, comprising:

a plurality of pixel electrodes arranged in a matrix;

switching elements connected thereto;

scanning electrodes, video signal electrodes;

common electrodes; and

a display medium interposed between the pixel electrodes and the common electrodes,

wherein a plurality of the common electrodes oppose the pixel electrodes of a plurality of pixels belonging to one of the scanning electrodes via the display medium.

58. A display element, comprising:

a plurality of pixel electrodes arranged in a matrix;

switching elements connected thereto;

scanning electrodes;

video signal electrodes;

common electrodes;

a counter electrode;

a display medium interposed between the pixel electrodes and the counter electrode; and

storage capacitance formed between the pixel electrodes and the common electrodes,

wherein, in a case where a scanning electrode-pixel electrode capacitance between the pixel electrodes and the scanning electrodes is represented by C_gd, a common electrode-pixel electrode capacitance between the pixel electrodes and the common electrodes is represented by C_st, and a total capacitance connected electrically to the pixel electrodes is represented by C_tot,

α

_gd and α

_st represented by

α

_gd=C_gd/C_tot, α

_st=C_st/C_tot 

 

(Formula

     1)

are set to be different values between a portion close to feeding ends in a screen and a portion away therefrom.

59. A display element, comprising:

a plurality of pixel electrodes arranged in a matrix;

switching elements connected thereto;

scanning electrodes;

video signal electrodes;

common electrodes;

a counter electrode;

a display medium interposed between the pixel electrodes and the counter electrode; and

storage capacitance formed between the pixel electrodes and either of the common electrodes, a plurality of the common electrodes that are connection destinations of the storage capacitance being connected to the pixel electrodes of a plurality of pixels belonging to one of the scanning electrodes,

wherein, in a case where a scanning electrode-pixel electrode capacitance between the pixel electrodes and the scanning electrodes is represented by C_gd, a common electrode-pixel electrode capacitance between the pixel electrodes and the common electrodes is represented by C_st, and a total capacitance connected electrically to the pixel electrodes is represented by C_tot,

α

_gd and α

_st represented by

α

_gd=C_gd/C_tot, α

_st=C_st/C_tot 

 

(Formula

     1)

are set to be different values between a portion close to feeding ends in a screen and a portion away therefrom.

60. A display element, comprising:

a plurality of pixel electrodes arranged in a matrix;

switching elements connected thereto;

scanning electrodes;

video signal electrodes;

common electrodes;

a display medium interposed between the pixel electrodes and the common electrodes; and

storage capacitance formed between electrodes, other than the common electrodes opposing the pixel electrodes via the display medium and the scanning electrodes of the stage concerned, and the pixel electrodes,

wherein, in a case where a scanning electrode-pixel electrode capacitance between the pixel electrodes and the scanning electrodes is represented by C_gd, a common electrode-pixel electrode capacitance between the pixel electrodes and the common electrodes is represented by C_lc, and a total capacitance connected electrically to the pixel electrodes is represented by C_tot,

α

_gd and α

_lc represented by

α

_gd=C_gd/C_tot, α

_lc=C_lc/C_tot 

 

(Formula

     6)

are set to be different values between a portion close to feeding ends in a screen and a portion away therefrom.

61. A display element, comprising:

a plurality of pixel electrodes arranged in a matrix;

switching elements connected thereto;

scanning electrodes;

video signal electrodes;

common electrodes;

a display medium interposed between the pixel electrodes and the common electrodes; and

storage capacitance formed between electrodes, other than the common electrodes opposing the pixel electrodes via the display medium and the scanning electrodes of the stage concerned, and the pixel electrodes, a plurality of the common electrodes opposing the pixel electrodes of a plurality of pixels belonging to one of the scanning electrodes via the display medium,

wherein, in a case where a scanning electrode-pixel electrode capacitance between the pixel electrodes and the scanning electrodes is represented by C_gd, a common electrode-pixel electrode capacitance between the pixel electrodes and the common electrodes is represented by C_lc, and a total capacitance connected electrically to the pixel electrodes is represented by C_tot,

α

_gd and α

_lc represented by

α

_gd=C_gd/C_tot, α

_lc=C_lc/C_tot 

 

(Formula

     6)

are set to be different values between a portion close to feeding ends in a screen and a portion away therefrom.

62. A display apparatus, comprising:

a plurality of pixel electrodes arranged in a matrix;

switching elements connected thereto;

scanning electrodes;

video signal electrodes;

common electrodes;

a counter electrode;

a display medium interposed between the pixel electrodes and the counter electrodes; and

storage capacitance formed between the pixel electrodes and the common electrodes, the scanning electrodes being supplied with a power only from one side of a display region, a potential of the common electrodes being fixed at least on a side opposite to the side where the scanning electrodes are supplied with a power in the display region,

wherein, in a case where a scanning electrode-pixel electrode capacitance between the pixel electrodes and the scanning electrodes is represented by C_gd, a common electrode-pixel electrode capacitance between the pixel electrodes and the common electrodes is represented by C_st, and a total capacitance connected electrically to the pixel electrodes is represented by C_tot,

when a value of α

_gd represented by

α

_gd=C_gd/C_tot 

 

(Formula

     101)

in a portion furthest from feeding ends of the scanning electrodes in a display region is α

_gd(F), there is a position where the value of α

_gd becomes larger than α

_gd(F) between the portion furthest from the feeding ends of the scanning electrodes in the display region and a portion closest thereto.

63. A display apparatus, comprising:

a plurality of pixel electrodes arranged in a matrix;

switching elements connected thereto;

scanning electrodes;

video signal electrodes;

common electrodes;

a display medium interposed between the pixel electrodes and the common electrodes; and

storage capacitance formed between electrodes, other than the common electrodes opposing the pixel electrodes via the display medium and the scanning electrodes of the stage concerned, and the pixel electrodes, the scanning electrodes being supplied with a power only from one side of a display region, a potential of the common electrodes being fixed at least on a side opposite to the side where the scanning electrodes are supplied with a power in the display region,

wherein, in a case where a scanning electrode-pixel electrode capacitance between the pixel electrodes and the scanning electrodes is represented by C_gd, a common electrode-pixel electrode capacitance between the pixel electrodes and the common electrodes is represented by C_lc, and a total capacitance connected electrically to the pixel electrodes is represented by C_tot,

when a value of α

_gd represented by

α

_gd=C_gd/C_tot 

 

(Formula

     101)

in a portion furthest from feeding ends of the scanning electrodes in a display region is α

_gd(F), there is a position where the value of α

_gd becomes larger than α

_gd(F) between the portion furthest from the feeding ends of the scanning electrodes in the display region and a portion closest thereto.