ELECTRO-OPTICAL DEVICE AND ELECTRONIC APPARATUS

Abstract

An electro-optical device includes a pair of substrates, and a liquid crystal layer between the substrates. At least one of the substrates has a plurality of scanning lines, a plurality of data lines, and pixel electrodes. The data lines intersect with the scanning lines. The pixel electrodes are disposed in a matrix and correspond to the intersections of the scanning lines with the data lines. When the elastic constant for splay distortion of a liquid crystal material forming the liquid crystal layer is K11, the elastic constant for bend distortion thereof is K33, the dielectric anisotropy thereof is Δε, and the rotational viscosity thereof is γ, the liquid crystal material satisfies the following conditions: 7 pN≦K11≦14 pN; 10 pN≦K33≦16 pN; 12≦Δ∈≦15; and 50 mPa·s≦γ≦100 mPa·s.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be described with reference to the accompanying drawings, wherein like numbers reference like elements.

FIG. 1 is a plan view of an electro-optical device and shows a TFT array substrate and components formed thereon viewed from the opposing substrate side.

FIG. 2 is a sectional view taken along line II-II of FIG. 1.

FIG. 3 shows an equivalent circuit including various elements and lines in a plurality of pixels that are formed in a matrix and that constitute an image display region of the electro-optical device.

FIG. 4 is a sectional view showing an example of configuration of a projection color display apparatus.

FIG. 5 is a graph showing the relationship between the elastic constant K11 for splay distortion of the liquid crystal material and the afterimage level L.

FIG. 6 is a graph showing the relationship between the elastic constant K33 for bend distortion of the liquid crystal material and the afterimage level L.

FIG. 7 is a graph showing the relationship between the dielectric anisotropy Δε of the liquid crystal material and the afterimage level L.

FIG. 8 is a graph showing the relationship between the rotational viscosity γ of the liquid crystal material, and the transmittance ratio T10 of a pixel 10 ms after the pixel is switched from black to white.

FIG. 9 is a graph showing the relationship between the pretilt angle θ0, the transmittance ratio T, and the afterimage level L.

FIG. 10 is a graph showing the relationship between the thickness d of the liquid crystal layer, the transmittance ratio T, and the afterimage level L.

FIG. 11 is a graph showing the relationship between the distance a1 between adjacent pixel electrodes, the contrast C, and the afterimage level L.

FIGS. 12A and 12B illustrate the configuration and the operation mode of a known liquid crystal display device.

FIGS. 13A and 13B illustrate the light leakage between adjacent pixel electrodes.

FIGS. 14A and 14B illustrate the light leakage between adjacent pixel electrodes.

Claims

1. An electro-optical device comprising: a pair of substrates; anda liquid crystal layer between the substrates,at least one of the substrates having a plurality of scanning lines, a plurality of data lines, and pixel electrodes, the data lines intersecting with the scanning lines, the pixel electrodes being disposed in a matrix and corresponding to the intersections of the scanning lines with the data lines,wherein when the elastic constant for splay distortion of a liquid crystal material forming the liquid crystal layer is K11, the elastic constant for bend distortion thereof is K33, the dielectric anisotropy thereof is Δε, and the rotational viscosity thereof is γ, the liquid crystal material satisfies the following conditions: 7 pN≦K11≦14 pN10 pN≦K33≦16 pN12≦Δε≦1550 mPa·s≦γ≦100 mPa·s.

2. The electro-optical device according to claim 1, wherein when the pretilt angle of the liquid crystal is θ0, and the thickness of the liquid crystal layer is d, θ0 and d satisfy the following conditions: 7°≦θ0≦20°2.1 μm≦d≦2.3 μm.

3. The electro-optical device according to claim 1, wherein when the distance between any adjacent two of the pixel electrodes is a1, a1 satisfies the following condition: 0.75 μm≦a1≦1.0 μm.

4. An electronic apparatus comprising the electro-optical device according to claims 1.