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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Accused Products
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.
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Citations
33 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:
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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, comprising a plurality of pixels each of which has a liquid crystal layer and a plurality of electrodes for applying an electric field across the liquid crystal layer, wherein:
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the plurality of pixels are arranged in a matrix (rp, cq) with a plurality of rows (1 to rp) and plurality of columns (1 to cq) and each pixel is expressed as P (p, q), where 1≤
p≤
rp and 1≤
q≤
cq;each of the plurality of pixels has at least two sub-pixels SPa (p, q), SPb (p, q), arranged in the column direction; the at least two sub-pixels differ from each other in brightness when displaying an intermediate grayscale; the at least two sub-pixels include two sub-pixels SPa (p, q) and SPb (p, q); SPa (p, q) and SPb (p, q) each comprise; a liquid crystal capacitor formed by a counter electrode and a sub-pixel electrode opposing the counter electrode via the liquid crystal layer, and a storage capacitor connected electrically to the liquid crystal capacitor and having a storage capacitor counter electrode; the counter electrode is a single electrode shared by SPa (p, q) and SPb (p, q), and the storage capacitor counter electrodes of SPa (p, q) and SPb (p, q) are electrically independent of each other; the liquid crystal display comprises two switching elements provided for SPa (p, q) and SPb (p, q), respectively; the two switching elements are turned on and off by a common scan line signal voltage;
a common display signal voltage is applied to the respective sub-pixel electrodes of SPa (p, q) and SPb (p, q) when the two switching elements are on;
voltages of the respective storage capacitor counter electrodes of SPa (p, q) and SPb (p, q) change after the two switching elements are turned off; andthe sub-pixels are arranged so that, in each vertical scanning period, any two sub-pixels which pertain to a same pixel or different pixels and which are adjacent to each other in the column direction differ from each other in terms of an exclusive disjunction of;
a) the direction of the electric field applied across the liquid crystal layer; and
b) the direction of the change of the voltage of the storage capacitor counter electrode, where a logical value of a) the direction of the electric field applied across the liquid crystal layer is true (T) if the direction is toward the counter electrode and false (F) if the direction is toward the sub-pixel electrode, and a logical value of b) the direction of the change of the voltage of the storage capacitor counter electrode is true (T) if the change is an increase and false (F) if the change is a decrease. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A liquid crystal display, comprising a plurality of pixels each of which has a liquid crystal layer and a plurality of electrodes for applying an electric field across the liquid crystal layer, wherein:
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the plurality of pixels are arranged in a matrix (rp, cq) with a plurality of rows (1 to rp) and plurality of columns (1 to cq) and each pixel is expressed as P (p, q), where 1≤
p≤
rp and 1≤
q≤
cq;each of the plurality of pixels has at least two sub-pixels SPa (p, q), SPb (p, q), arranged in the column direction; the at least two sub-pixels differ from each other in brightness when displaying an intermediate grayscale; the at least two sub-pixels include two sub-pixels SPa (p, q) and SPb (p, q); SPa (p, q) and SPb (p, q) each comprise; a liquid crystal capacitor formed by a counter electrode and a sub-pixel electrode opposing the counter electrode via the liquid crystal layer, and a storage capacitor connected electrically to the liquid crystal capacitor and having a storage capacitor counter electrode; the counter electrode is a single electrode shared by SPa (p, q) and SPb (p, q), and the storage capacitor counter electrodes of SPa (p, q) and SPb (p, q) are electrically independent of each other; the liquid crystal display comprises two switching elements provided for SPa (p, q) and SPb (p, q), respectively; the two switching elements are turned on and off by a common scan line signal voltage;
a common display signal voltage is applied to the respective sub-pixel electrodes of SPa (p, q) and SPb (p, q) when the two switching elements are on;
voltages of the respective storage capacitor counter electrodes of SPa (p, q) and SPb (p, q) change after the two switching elements are turned off; andin each vertical scanning period, any two sub-pixels which pertain to a same pixel or different pixels and which are adjacent to each other in the column direction are opposite in the direction of the electric field applied across the liquid crystal layer and equal in the direction of the change of the voltage of the storage capacitor counter electrode, or, equal in the direction of the electric field applied across the liquid crystal layer and opposite in the direction of the change of the voltage of the storage capacitor counter electrode.
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Specification