Liquid Crystal Panel Curved Electrodes FFS Mode
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Solution Overview
Problem
Liquid crystal display apparatuses in FFS mode face issues with high driving voltage and reduced transmittance due to non-uniform electric field distribution and dark line generation, especially with flat plate form pixel electrodes.
Innovation Solution
A liquid crystal panel design featuring a first substrate with matrix-formed signal and scanning lines, slit-shaped openings, and cross-sectional curve-shaped protruded electrodes, and a second substrate with a light-shielding layer and color filter, using a mixture of compounds with negative and positive dielectric anisotropy for uniform electric field generation and high transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a flat plate form pixel electrode is used in FFS mode, then the device structure is simple, but the electric field distribution becomes non-uniform causing dark lines and reduced transmittance
Solution Approach 1:
The pixel electrode is designed with a curved surface (convex shape) instead of a flat plate form. This curvature modifies the electric field distribution between the pixel electrode and counter electrode, eliminating non-uniformity and preventing dark line generation while maintaining FFS mode operation
2Adaptability or versatility
If the liquid crystal panel operates in FFS mode with conventional electrodes, then the viewing angle is wide, but the driving voltage becomes high and transmittance is reduced
Solution Approach 1:
The invention changes the geometric parameters of the pixel electrode by introducing a curved surface with specific radius of curvature. This parameter modification optimizes the electric field distribution, enabling efficient FFS mode operation at lower driving voltages while maintaining wide viewing angle characteristics
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables low-voltage operation and high transmittance in FFS mode liquid crystal panels by optimizing electric field distribution and minimizing dark line generation.
Implementation Method 1
orientation of liquid crystal molecules aligned in a predetermined direction is changed by an electric field to change an amount of light transmitted through a liquid crystal layer
Implementation Method 2
a rubbing direction of a liquid crystal having a positive dielectric anisotropy (Δ∈) is adjusted to coincide with a direction of a noise field
Implementation Method 3
cross-sectional curve-shaped protruded electrodes alternately formed for every sub-pixel... using a mixture of compounds with negative and positive dielectric anisotropy for uniform electric field generation
Data Source
AI summary
To allow drive at low voltage and obtaining high transmittance in liquid crystal panel driven by FFS mode. Liquid crystal panel 10 has first substrate 14 and second substrate 27 oppositely arranged, and liquid crystal layer LC interposed between the first and the second substrates, wherein the first substrate has plural signal lines 18 and scanning lines 15 formed in matrix in mutually insulated state, upper electrode 24 having plural slit-shaped openings 25 divided by the scanning lines and signal lines, and formed for every sub-pixel, and lower electrode 21 formed with the upper electrode through insulating layer 23, the second substrate has light-shielding layer 28 superimposed with the signal lines and scanning lines in planar view, and color filter layer 29 formed for every sub-pixel, and the liquid crystal layer has at least one compound having negative dielectric anisotropy and at least one compound having positive dielectric anisotropy mixed.