DISPLAY DEVICE, ACTIVE MATRIX SUBSTRATE, LIQUID CRYSTALD DISPLAY DEVICE AND TELEVISION RECEIVER

• US 20090009449A1
• Filed: 11/30/2006
• Published: 01/08/2009
• Est. Priority Date: 02/06/2006
• Status: Abandoned Application

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Tsubata, Toshihide, Uchida, Toshihisa
• Application Number:
  US12/087,863
• Publication Number:
  US 20090009449A1
• Time in Patent Office: Days
• US Class Current: 345/87
• CPC Class Codes: G02F 1/134345 Subdivided pixels, e.g. for grey scale or redundancy
• CPC Class Codes: G02F 1/13624 having more than one switching element per pixel
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/0443 with several sub-pixels for the same colour in a pixel, not specifically used to display gradations G09G3/364 takes precedence
• CPC Class Codes: G09G 2300/0447 for multi-domain technique to improve the viewing angle in a liquid crystal display, such as multi-vertical alignment [MVA]
• CPC Class Codes: G09G 2300/0876 Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes
• CPC Class Codes: G09G 2310/0235 Field-sequential colour display
• CPC Class Codes: G09G 2320/028 by changing the viewing angle properties, e.g. widening the viewing angle, adapting the viewing angle to the view direction
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

In one embodiment of a display device, pixels are arranged in matrix, and a first luminance area (high luminance area) and a second luminance area (low luminance area) which surrounds the first luminance area and has a luminance lower than that of the first luminance area can be formed in each pixel. The display device which can clearly display an image having a high spatial frequency and an active matrix substrate to be used for the display device are provided.

Claims

1. A display device comprising:

a plurality of pixels, wherein;

a first luminance area and a second luminance area which surrounds the first luminance area and has a luminance lower than that of the first luminance area are capable of being formed in each of the pixels.

2. The display device according to claim 1, wherein each of the pixels further includes:

a first switching element;

a second switching element;

a first sub-pixel electrode connected to the first switching element; and

a second sub-pixel electrode which surrounds the first sub-pixel electrode and is connected to the second switching element.

3. The display device according to claim 1, wherein:

said first luminance area and said second luminance area have shapes which have a same gravity center.

4. The display device according to claim 1, wherein:

a lowest luminance area is provided between said first luminance area and said second luminance area.

5. The display device according to claim 1, wherein:

said first luminance area and said second luminance area are adjacent to each other.

6. The display device according to claim 4, further comprising:

an active matrix substrate; and

a color filter substrate,

said lowest luminance area is formed at least one of a black matrix in the color filter substrate and a light-shielding body in the active matrix substrate.

7. The display device according to claim 2, wherein:

said first switching element and said second switching element are connected to a same data signal line.

8. The display device according to claim 7, wherein:

said first switching element and said second switching element are connected to a same scan signal line.

9. The display device according to claim 8, further comprising:

a first retentive capacity wiring, said first sub-pixel electrode and the first retentive capacity wiring defining capacitance; and

a second retentive capacity wiring, said second sub-pixel electrode and the second retentive capacity wiring defining capacitance,

electric potentials of the first retentive capacity wiring and the second retentive capacity wiring being independently controlled.

10. The display device according to claim 9, wherein:

said first retentive capacity wiring and said second retentive capacity wiring are controlled to have waveforms whose phase shift is 180°

.

11. The display device according to claim 9, wherein:

(i) the first retentive capacity wiring is controlled to have an electric potential which increases after each of the switching elements turns off and is then maintained until each of the switching elements turns off in a following frame; and

the second retentive capacity wiring is controlled to have an electric potential which decreases after each of the switching elements turns off and is then maintained until each of the switching elements turns off in the following frame, or

(ii) the first retentive capacity wiring is controlled to have an electric potential which decreases after the each of the switching elements turns off and is then maintained until each of the switching elements turns off in a following frame; and

the second retentive capacity wiring is controlled to have an electric potential which increases after each of the switching elements turns off and is then maintained until each of the switching elements turns off in the following frame.

12. The display device according to claim 2, wherein:

said first switching element and said second switching element are connected to first signal line and second scan signal line, respectively.

13. The display device according to claim 12, wherein:

an on-pulse signal applied to said first scan signal line and an on-pulse signal applied to said second scan signal line do not temporally overlap.

14. The display device according to claim 12, wherein:

an on-pulse signal applied to said first scan signal line and an on-pulse signal applied to said second scan signal line overlap for a certain period of time but become in their off-states at different timing, respectively.

15. The display device according to claim 14, wherein:

the on-pulse signal applied to the first scan signal line and the on-pulse signal applied to the second scan signal line simultaneously become in their on-states but the on-pulse signal applied to the first scan signal line becomes in its off-state earlier than the on-pulse signal applied to the second scan signal line.

16. The display device according to claim 14, wherein:

an electric potential applied to the data signal line changes in sync with timing at which one of the on-pulse signals becomes in its off-state earlier than the other or after the timing.

17. The display device according to claim 7, wherein:

a polarity of an electric potential applied to the same data signal line is inverted for every horizontal period.

18. The display device according to claim 2, wherein:

said first switching element and said second switching element are connected to independent first and second data signal lines, respectively.

19. The display device according to claim 18, wherein:

said first luminance area and said second luminance area are formed by applying different signal electric potentials to the first and the second data signal lines, respectively.

30. The display device according to claim 11, wherein:

increasing of the electric potential of the first retentive capacity wiring is in sync with decreasing of the electric potential of the second retentive capacity wiring;

or

decreasing of the electric potential of the first retentive capacity wiring is in sync with increasing of the electric potential of the second retentive capacity wiring.

31. The display device according to claim 11, wherein:

increasing of the electric potential of the first retentive capacity wiring and decreasing of the electric potential of the second retentive capacity wiring are shifted by one horizontal period;

or

decreasing of the electric potential of the first retentive capacity wiring and increasing of the electric potential of the second retentive capacity wiring are shifted by one horizontal period.

34. A liquid crystal display device comprising:

a display device recited in claim 1.

35. A television receiver comprising:

a display device recited in claim 1; and

a tuner for receiving television broadcasting.

20. An active matrix substrate comprising:

a plurality of pixel regions,

wherein each of the pixel regions includes;

a first switching element;

a second switching element;

a first sub-pixel electrode connected to the first switching element; and

a second sub-pixel electrode which surrounds the first sub-pixel electrode, and is connected to the second switching element.

21. The active matrix substrate according to claim 20, wherein:

said first switching element and said second switching element are connected to a same scan signal line.

22. The active matrix substrate according to claim 20, further comprising:

a single data signal line provided to each of the pixel regions, said first and second switching elements being connected to the single data signal line;

a first retentive capacity wiring, said first sub-pixel electrode and the first retentive capacity wiring defining capacitance; and

a second retentive capacity wiring, said second sub-pixel electrode and the second retentive capacity wiring defining capacitance.

23. The active matrix substrate according to claim 20, wherein:

independent first and second data signal lines are provided to the pixel regions, respectively;

the first data signal line is connected to the first switching element; and

the second signal line is connected to the second switching element.

24. The active matrix substrate according to claim 20, wherein:

a light-shielding body is provided so that the light-shielding body and a boundary area between the first sub-pixel electrode and the second sub-pixel electrode overlap each other.

25. The active matrix substrate according to claim 20, wherein:

a part of the wiring from the first switching element or the second switching element and a boundary area between the first sub-pixel electrode and the second sub-pixel electrode overlap each other.

26. The active matrix substrate according to claim 21, wherein:

a part of the scan signal line and a boundary area between the first sub-pixel electrode and the second sub-pixel electrode overlap each other.

27. The active matrix substrate according to claim 22, wherein:

a part of the first retentive capacity wiring and a boundary area between the first sub-pixel electrode and the second sub-pixel electrode overlap each other.

28. The active matrix substrate according to claim 26, wherein:

the scan signal line is wired in a middle part of a pixel in a frame shape so that the scan signal line and the boundary area overlap each other.

29. The active matrix substrate according to claim 27, wherein:

the first retentive capacity wiring is wired in a middle part of a pixel in a frame shape so that the first retentive capacity wiring and the boundary area overlap each other.

32. A display device comprising:

an active matrix substrate according to claim 20.

33. A display device comprising:

an active matrix substrate according to claim 20;

a back light radiating a plurality of colors in a time division; and

said display device performing a field sequential display.