LCD Pixel Electrode Shielding for Lateral Visibility
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Solution Overview
Problem
Liquid crystal display (LCD) devices with vertically aligned mode face challenges in maintaining high contrast ratio and wide viewing angles while minimizing the reduction in aperture ratio, which affects lateral visibility and transmittance at various gray levels.
Innovation Solution
The design incorporates a pixel electrode with sub-pixel electrodes and a shielding electrode on the same layer, where the sub-pixel electrodes have different widths and orientations, and a black matrix on the opposing substrate that overlaps some sub-pixel electrodes but not others, optimizing the electric field and light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a black matrix is used to improve lateral visibility, then lateral visibility is improved, but aperture ratio is reduced
Solution Approach 1:
The patent applies local quality by making the black matrix width variable across different regions. Specifically, the black matrix has a first width in a first region and a second width smaller than the first width in a second region, allowing different areas to have different optical properties optimized for their specific function
Solution Approach 2:
The pixel electrode is divided into multiple sub-pixel electrodes (first sub-pixel electrode, second sub-pixel electrode, third sub-pixel electrode) with different configurations. Each sub-pixel electrode region can be independently optimized with appropriate black matrix coverage, segmenting the overall pixel to achieve both high visibility and high aperture ratio
2Object-affected harmful factors
If the black matrix overlaps all sub-pixel electrodes to improve lateral visibility, then lateral visibility is improved, but transmittance at various gray levels is reduced
Solution Approach 1:
The patent implements local quality by selectively positioning the black matrix to overlap only certain sub-pixel electrodes (first and second sub-pixel electrodes) while leaving others (third sub-pixel electrode) uncovered. This localized approach optimizes lateral visibility where needed while preserving transmittance in regions where it is more critical
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 enhances lateral visibility by minimizing the reduction in aperture ratio and maintaining high transmittance across different gray levels, improving the overall performance of the LCD device.
Implementation Method 1
voltages are applied to the field generating electrodes to generate an electric field in the liquid crystal layer. Accordingly, the direction of liquid crystal molecules of the liquid crystal layer is determined, and polarization of incident light is controlled by the generated electric field
Data Source
AI summary
A liquid crystal display device includes a first substrate, a pixel electrode which is disposed on the first substrate and comprises a first sub-pixel electrode and a second sub-pixel electrode adjacent to the first sub-pixel electrode along a first direction, and a shielding electrode which is disposed on the same layer as the pixel electrode and comprises a first area having a first width and a second area having a second width which is smaller than the first width along a second direction which crosses the first direction, and the first sub-pixel electrode may be adjacent to the first area along the second direction, and the second sub-pixel electrode may be adjacent to the second area along the second direction.