Liquid crystal display
First Claim
1. A liquid crystal display used in normally black mode, comprising a plurality of pixels each of which has a liquid crystal layer and a plurality of electrodes for applying voltage to the liquid crystal layer, wherein:
- each of the plurality of pixels comprises a first sub-pixel and a second sub-pixel which can apply mutually different voltages to their respective liquid crystal layers; and
when each of the plurality of pixels displays a grayscale gk which satisfies 0≦
gk≦
n, where gk and n are integers not less than zero and a larger value of gk corresponds to higher brightness, n represents the highest grayscale, and at least the range of 0<
gk≦
n−
1 includes gk which satisfies relationships Δ
V12 (gk)>
0 volts and Δ
V12 (gk)≧
Δ
V12 (gk+1) if it is assumed that Δ
V12 (gk)=V1 (gk)−
V2 (gk), where V1 (gk) and V2 (gk) are root-mean-square voltages applied to the liquid crystal layers of the first sub-pixel and the second sub-pixel, respectively.
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Abstract
To reduce viewing angle dependence of γ characteristics in a normally black liquid crystal display.
Each pixel 10 has a first sub-pixel 10a and a second sub-pixel 10b which can apply mutually different voltages to their respective liquid crystal layers. Relationships ΔV12 (gk)>0 volts and ΔV12 (gk)≧ΔV12 (gk+1) are satisfied at least in a range 0<gk≦n−1 if it is assumed that ΔV12=V1−V2, where ΔV12 is the difference between root-mean-square voltage V1 applied to the liquid crystal layer of the first sub-pixel 10a and root-mean-square voltage V2 applied to the liquid crystal layer of the second sub-pixel 10b.
30 Citations
28 Claims
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1. A liquid crystal display used in normally black mode, comprising a plurality of pixels each of which has a liquid crystal layer and a plurality of electrodes for applying voltage to the liquid crystal layer, wherein:
-
each of the plurality of pixels comprises a first sub-pixel and a second sub-pixel which can apply mutually different voltages to their respective liquid crystal layers; and when each of the plurality of pixels displays a grayscale gk which satisfies 0≦
gk≦
n, where gk and n are integers not less than zero and a larger value of gk corresponds to higher brightness, n represents the highest grayscale, and at least the range of 0<
gk≦
n−
1 includes gk which satisfies relationships Δ
V12 (gk)>
0 volts and Δ
V12 (gk)≧
Δ
V12 (gk+1) if it is assumed that Δ
V12 (gk)=V1 (gk)−
V2 (gk), where V1 (gk) and V2 (gk) are root-mean-square voltages applied to the liquid crystal layers of the first sub-pixel and the second sub-pixel, respectively. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A liquid crystal display used in a normally black mode, comprising:
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a plurality of pixels, each pixel including a first sub-pixel electrode and a second sub-pixel electrode forming a first sub-pixel and a second sub-pixel, respectively; a first switching element and a second switching element respectively connected to the first and second sub-pixel electrodes; at least one scan line connected to the first and second switching elements; a first signal line and a second signal line respectively connected to the first and second switching elements; a counter electrode; a first liquid crystal capacitor formed by the first sub-pixel electrode, the counter electrode and a liquid crystal layer therebetween; a second liquid crystal capacitor formed by the second sub-pixel electrode, the counter electrode and a liquid crystal layer therebetween; wherein when the first and second switching elements are turned on by a scan signal voltage supplied to the at least one scan line, display signal voltages are applied to the first and second sub-pixel electrodes such that mutually different root-mean-square voltages are applied to the first signal line and the second signal line, respectively; wherein the first sub-pixel and the second sub-pixel display one of a plurality of grayscales in cooperation with each other; and the first sub-pixel and the second sub-pixel are arranged in a direction crossing the at least one scan line; and
whereinwhen the first sub-pixel and the second sub-pixel display an intermediate grayscale in cooperation with each other, the first sub-pixel displays a first intermediate grayscale and the second sub-pixel displays a second intermediate grayscale. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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16. The liquid crystal display according to claim 15, wherein
each of the first sub-pixel and the second sub-pixel includes multiple domains in which the liquid crystal molecules in each of the multiple domains align in different directions when a voltage is applied across the liquid crystal layers. -
17. The liquid crystal display according to claim 16, wherein the each of the plurality of pixels includes four domains which are approximately 90 degrees different in azimuth direction in which their liquid crystal molecules align when a voltage is applied across the liquid crystal layers.
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18. The liquid crystal display according to claim 17, wherein the azimuth directions of the four domains are upper right, upper left, lower left, and lower right.
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19. The liquid crystal display according to claim 18, wherein
the number of the multiple domains included in each of the first sub-pixel and the second sub-pixel is four. -
20. The liquid crystal display according to claim 12, wherein
a region of one of the plurality of pixels is a rectangular shape having a longitudinal direction which crosses the at least one scan line. -
21. The liquid crystal display according to claim 12, wherein when the first and second switching elements are turned on by a scan signal voltage supplied to the at least one scan line, display signal voltages are applied to the first and second sub-pixel electrodes such that mutually different root-mean-square voltages are applied across the liquid crystal layers of the first and second sub-pixels.
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22. A display method for a liquid crystal display used in a normally black mode, the method comprising:
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supplying a scan signal voltage to at least one scan line to turn on a first and a second switching element connected to the at least one scan line, the first switching element and second switching element respectively being further connected to a first sub-pixel electrode forming a first sub-pixel of a pixel and a second sub-pixel electrode forming a second sub-pixel of the pixel, wherein a first liquid crystal capacitor is formed by the first sub-pixel electrode, a counter electrode and a liquid crystal layer therebetween and wherein a second liquid crystal capacitor is formed by the second sub-pixel electrode, the counter electrode and a liquid crystal layer therebetween; and applying display signal voltages to the first and second sub-pixel electrodes, via a first signal line and a second signal line respectively connected to the first and second switching elements, such that mutually different root-mean-square voltages are applied to the first signal line and the second signal line, respectively; wherein the first sub-pixel and the second sub-pixel display one of a plurality of grayscales in cooperation with each other, and the first sub-pixel and the second sub-pixel are arranged in a direction crossing the at least one scan line, and wherein when the first sub-pixel and the second sub-pixel display an intermediate grayscale in cooperation with each other, the first sub-pixel displays a first intermediate grayscale and the second sub-pixel displays a second intermediate grayscale. - View Dependent Claims (23, 24)
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25. A liquid crystal display used in a normally black mode, comprising:
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a plurality of pixels, each pixel including a first sub-pixel electrode and a second sub-pixel electrode forming a first sub-pixel and a second sub-pixel, respectively; a first switching element and a second switching element respectively connected to the first and second sub-pixel electrodes; at least one scan line connected to the first and second switching elements; a first signal line and a second signal line respectively connected to the first and second switching elements; a counter electrode; a first liquid crystal capacitor formed by the first sub-pixel electrode, the counter electrode and a liquid crystal layer therebetween; a second liquid crystal capacitor formed by the second sub-pixel electrode, the counter electrode and a liquid crystal layer therebetween; wherein when the first and second switching elements are turned on by a scan signal voltage supplied to the at least one scan line, display signal voltages are applied to the first and second sub-pixel electrodes such that mutually different root-mean-square voltages are applied across the liquid crystal layers of the first and second sub-pixels; wherein the first sub-pixel and the second sub pixel display one of a plurality of grayscales in cooperation with each other; and the first sub-pixel and the second sub-pixel are arranged in a direction crossing the at least one scan line, wherein when the first sub-pixel and the second sub-pixel display an intermediate grayscale in cooperation with each other, the first sub-pixel displays a first intermediate grayscale and the second sub-pixel displays a second intermediate grayscale, and a grayscale range of 0<
gk<
n includes at least one pair of grayscales gk1 and gk1′
which satisfies relationships gk1<
gk1′ and
Δ
V12(gk1)≧
Δ
V12(gk1′
) if it is assumed that 0 is a minimum grayscale, n is a maximum grayscale and Δ
V12(gk)=V1(gk)−
V2(gk), where V1(gk) and V2(gk) are root-mean-square voltages applied to the liquid crystal layers of the first sub-pixel and the second sub-pixel, respectively, and V1(gk1)>
V2(gk1).
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26. A liquid crystal display used in a normally black mode, comprising:
-
a plurality of pixels, each pixel including a first sub-pixel electrode and a second sub-pixel electrode forming a first sub-pixel and a second sub-pixel, respectively; a first switching element and a second switching element respectively connected to the first and second sub-pixel electrodes; at least one scan line connected to the first and second switching elements; a first signal line and a second signal line respectively connected to the first and second switching elements; a counter electrode; a first liquid crystal capacitor formed by the first sub-pixel electrode, the counter electrode and a liquid crystal layer therebetween; a second liquid crystal capacitor formed by the second sub-pixel electrode, the counter electrode and a liquid crystal layer therebetween; wherein when the first and second switching elements are turned on by a scan signal voltage supplied to the at least one scan line, display signal voltages are applied to the first and second sub-pixel electrodes such that mutually different root-mean-square voltages are applied across the liquid crystal layers of the first and second sub-pixels; wherein the first sub-pixel and the second sub-pixel display one of a plurality of grayscales in cooperation with each other; and the first sub-pixel and the second sub-pixel are arranged in a direction crossing the at least one scan line, wherein when the first sub-pixel and the second sub-pixel display an intermediate grayscale in cooperation with each other, the first sub-pixel displays a first intermediate grayscale and the second sub-pixel displays a second intermediate grayscale, and a grayscale range of 0<
gk<
n includes at least one pair of grayscales gk2 and gk2′
which satisfies relationships gk2<
gk2′ and
V2(gk2)/V1(gk2)≦
V2(gk2′
)/V1(gk2′
) if it is assumed that 0 is a minimum grayscale, n is a maximum grayscale and V1(gk) and V2(gk) are root-mean-square voltages applied to the liquid crystal layers of the first sub-pixel and the second sub-pixel, respectively, and V1(gk2)>
V1(gk2).
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27. A display method for a liquid crystal display used in a normally black mode, the method comprising:
-
supplying a scan signal voltage to at least one scan line to turn on a first and a second switching element connected to the at least one scan line, the first switching element and second switching element respectively being further connected to a first sub-pixel electrode forming a first sub-pixel of a pixel and a second sub-pixel electrode forming a second sub-pixel of the pixel, wherein a first liquid crystal capacitor is formed by the first sub-pixel electrode, a counter electrode and a liquid crystal layer therebetween and wherein a second liquid crystal capacitor is formed by the second sub-pixel electrode, the counter electrode and a liquid crystal layer therebetween; and applying display signal voltages to the first and second sub-pixel electrodes, via a first signal line and a second signal line respectively connected to the first and second switching elements, such that mutually different root-mean-square voltages are applied across the liquid crystal layers of the first and second sub-pixels; wherein the first sub-pixel and the second sub-pixel display one of a plurality of grayscales in cooperation with each other, and the first sub-pixel and the second sub-pixel are arranged in a direction crossing the at least one scan line, wherein when the first sub-pixel and the second sub-pixel display an intermediate grayscale in cooperation with each other, the first sub-pixel displays a first intermediate grayscale and the second sub-pixel displays a second intermediate grayscale, and a grayscale range of 0<
gk<
n includes at least one pair of grayscales gk1 and gk1′
which satisfies relationships gk1<
gk1′ and
Δ
V12(gk1)≧
Δ
V12(gk1′
) if it is assumed that 0 is a minimum grayscale, n is a maximum grayscale and Δ
V12(gk)=V1(gk)−
V2(gk), where V1(gk) and V2(gk) are root-mean-square voltages applied to the liquid crystal layers of the first sub-pixel and the second sub-pixel, respectively, and V1(gk1)>
V2(gk1).
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28. A display method for a liquid crystal display used in a normally black mode, the method comprising:
-
supplying a scan signal voltage to at least one scan line to turn on a first and a second switching element connected to the at least one scan line, the first switching element and second switching element respectively being further connected to a first sub-pixel electrode forming a first sub-pixel of a pixel and a second sub-pixel electrode forming a second sub-pixel of the pixel, wherein a first liquid crystal capacitor is formed by the first sub-pixel electrode, a counter electrode and a liquid crystal layer therebetween and wherein a second liquid crystal capacitor is formed by the second sub-pixel electrode, the counter electrode and a liquid crystal layer therebetween; and applying display signal voltages to the first and second sub-pixel electrodes, via a first signal line and a second signal line respectively connected to the first and second switching elements, such that mutually different root-mean-square voltages are applied across the liquid crystal layers of the first and second sub-pixels; wherein the first sub-pixel and the second sub-pixel display one of a plurality of grayscales in cooperation with each other, and the first sub-pixel and the second sub-pixel are arranged in a direction crossing the at least one scan line, wherein when the first sub-pixel and the second sub-pixel display an intermediate grayscale in cooperation with each other, the first sub-pixel displays a first intermediate grayscale and the second sub-pixel displays a second intermediate grayscale, and a grayscale range of 0<
gk<
n includes at least one pair of grayscales gk2 and gk2′
which satisfies relationships gk2<
gk2′ and
V2(gk2)/V1(gk2)≧
V2(gk2′
)/V1(gk2′
) if it is assumed that 0 is a minimum grayscale, n is a maximum grayscale and V1(gk) and V2(gk) are root-mean-square voltages applied to the liquid crystal layers of the first sub-pixel and the second sub-pixel, respectively, and V1(gk2)>
V2(gk2).
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Specification