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.
28 Citations
25 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 counter electrode; a first liquid crystal capacitor formed by the first sub-pixel electrode, the counter electrode and a liquid crystal layer therebetween; and a second liquid crystal capacitor formed by the second sub-pixel electrode, the counter electrode and a liquid crystal layer therebetween, a circuit configured to apply voltages to the first sub-pixel electrode and the second sub-pixel electrode, wherein when voltages V1 and V2 are respectively applied across the liquid crystal layers of the first and second sub-pixels, such that the first sub-pixel and the second sub-pixel display one of a plurality of grayscales in cooperation with each other, a ratio of V2/V1 for a first value of V1, which is accompanied by a first value of V2, is less than the ratio of V2/V1 at a second relatively greater value of V1, which is accompanied by a second relatively greater value of V2, and wherein, at least at the second relatively greater value of V1, values of V1 and V2 are mutually different, and the value of V1 is larger than the value of V2. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. 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, the first sub-pixel electrode and the second sub-pixel electrode forming a 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 respectively applying voltages V1 and V2 across the liquid crystal layers of the first and second sub-pixels such that the first sub-pixel and the second sub-pixel display one of a plurality of grayscales in cooperation with each other, a ratio of V2/V1 for a first value of V1, which is accompanied by a first value of V2, is less than the ratio of V2/V1 at a second relatively greater value of V1, which is accompanied by a second relatively greater value of V2, and such that, at least at the second relatively greater value of V1, values of V1 and V2 are mutually different, and the value of V1 is larger than the value of V2. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification