Liquid Crystal Display Pixel Electrode Orientation for Crosstalk Reduction
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Solution Overview
Problem
Crosstalk occurs in Fringe Field Switching (FFS)-mode liquid crystal display devices when the liquid crystal acts as a phase diffraction grating due to the alignment of comb teeth-shaped pixel electrodes, particularly when the rectangular pixel area is vertically longer, causing both right and left eye images to be observed simultaneously.
Innovation Solution
A liquid crystal display device with a pixel electrode having strip-shaped parts arranged with intervals, where the extending direction of these parts is substantially perpendicular to the opening direction of the slit section of a light-shielding barrier, which includes a slit section and a light-shielding section to cause binocular parallax, and a barrier driving section to move the light-shielding barrier according to the observer's position, reducing crosstalk by preventing parallel light rays from aligning with the slit direction of the pixel electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the comb teeth of the pixel electrode extend in the longitudinal direction of a vertically longer rectangular pixel area, then the pixel electrode structure is simplified, but crosstalk increases because the slit direction becomes parallel to the opening direction of the parallax barrier
Solution Approach 1:
The patent changes the orientation relationship between the pixel electrode slit direction and the parallax barrier opening direction from parallel to substantially perpendicular. This asymmetric reorientation prevents the liquid crystal from acting as a phase diffraction grating in the direction that causes crosstalk, while still allowing the comb teeth structure to extend in the longitudinal direction of vertically longer pixel areas for manufacturing simplicity.
2Device complexity
If the liquid crystal acts as a phase diffraction grating due to comb teeth-shaped pixel electrode alignment, then the pixel electrode can be formed with simple comb teeth shape, but crosstalk occurs where right and left eye images are observed simultaneously
Solution Approach 1:
The patent maintains the simple comb teeth-shaped pixel electrode structure but changes the orientation of the slit direction to be substantially perpendicular to the opening direction of the parallax barrier. This asymmetric reorientation prevents the liquid crystal from functioning as a phase diffraction grating that would cause crosstalk, while preserving the manufacturing simplicity of the comb teeth structure.
3Shape
If the slit direction of the pixel electrode is parallel to the opening direction of the parallax barrier, then the rectangular pixel area can be in portrait orientation, but the influence of crosstalk due to liquid crystal phase diffraction grating increases
Solution Approach 1:
The patent allows the rectangular pixel area to maintain its portrait orientation but changes the slit direction of the pixel electrode to be substantially perpendicular to the opening direction of the parallax barrier. This asymmetric reorientation eliminates the parallel alignment that causes liquid crystal to act as a phase diffraction grating, thereby suppressing crosstalk while preserving the desired pixel area shape.
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
This configuration effectively suppresses crosstalk in 3D image display by ensuring the liquid crystal does not act as a diffraction grating in the direction perpendicular to the slit direction of the pixel electrode, maintaining image separation and reducing unwanted image observation.
Implementation Method 1
a light-shielding barrier which has a slit section and a light-shielding section to cause binocular parallax
Implementation Method 2
the liquid crystal for each pixel acts as a liquid crystal phase diffraction grating in accordance with the alignment of the liquid crystal determined by a comb teeth-shaped pixel electrode
Data Source
AI summary
A liquid crystal display device includes a liquid crystal panel which displays a left eye image and a right eye image; and a light-shielding barrier which has a slit section and a light-shielding section to cause binocular parallax, wherein the liquid crystal panel includes a first substrate which has a pixel electrode formed thereon, a second substrate which is separated from and opposed to the surface of the first substrate which has the pixel electrode formed thereon, and a liquid crystal layer which is disposed between the first substrate and the second substrate, the pixel electrode has a plurality of strip-shaped parts which are arranged with intervals therebetween, and an extending direction of the strip-shaped parts is substantially perpendicular to an opening direction of the slit section.