LCD Sub-Pixel Electrode Design for Lateral Visibility
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Solution Overview
Problem
Liquid crystal display (LCD) devices in vertically aligned mode suffer from poor visibility at lateral sides due to luminance differences, which current methods like dividing pixels into sub-pixels with capacitor combinations fail to adequately address, leading to inconsistent light transmittance and aperture ratio issues.
Innovation Solution
The implementation of an LCD design where each pixel is divided into two sub-pixels with different data voltages applied, featuring a sub-pixel electrode larger in area and a storage electrode with specific overlapping areas to manage kickback voltages, ensuring equal kickback voltage levels and independent control of light transmittance for enhanced lateral side visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If pixels are divided into two sub-pixels with capacitor combination to enhance lateral side visibility, then lateral side visibility is improved, but light transmittance is reduced and aperture ratio is deteriorated
Solution Approach 1:
The pixel is divided into two sub-pixels (first sub-pixel and second sub-pixel) with different voltage applications. The first sub-pixel receives a first voltage and the second sub-pixel receives a second voltage, creating different light transmittances to enhance lateral side visibility while maintaining overall light efficiency.
Solution Approach 2:
Different regions of the pixel (first sub-pixel and second sub-pixel) are assigned different electrical characteristics through separate voltage applications. The first sub-pixel electrode has a larger area than the second sub-pixel electrode, creating localized quality differences that optimize both visibility and light transmittance in different areas.
2Illumination intensity
If pixels are divided into two sub-pixels with capacitor combination to enhance lateral side visibility, then lateral side visibility is improved, but aperture ratio is deteriorated
Solution Approach 1:
The pixel is segmented into two sub-pixels with different voltage applications. The first sub-pixel electrode has a larger area than the second sub-pixel electrode, allowing optimized light transmittance control without requiring additional capacitor structures that would reduce aperture ratio.
Solution Approach 2:
The first sub-pixel electrode and second sub-pixel electrode are merged into a single pixel structure with complementary functions. The larger first sub-pixel electrode compensates for the area occupied by the second sub-pixel electrode, maintaining a high overall aperture ratio while achieving differential voltage control.
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 approach enhances lateral side visibility while maintaining reasonable light transmittance and aperture ratio, improving the overall display quality by allowing precise control of light transmittance and voltage adjustments for each sub-pixel.
Implementation Method 1
The LCD generates an electric field in the liquid crystal layer by applying voltages to the field-generating electrodes
Implementation Method 2
aligns the liquid crystal molecules of the liquid crystal layer to control the polarization of light incident thereto
Implementation Method 3
The overlapping area between the first drain electrode and the storage electrode of a first sub-pixel may be larger than the overlapping area between the drain electrode and the storage electrode of a second sub-pixel. Thus the kickback voltage of the first sub-pixel may be substantially the same as the kickback voltage of the second sub-pixel.
Data Source
AI summary
A liquid crystal display includes an array of pixels. Each pixel is divided into a first sub-pixel and a second sub-pixel, and different data voltages are separately applied to (or evolved at) the two sub-pixels, thereby enhancing the lateral side visibility. Each sub-pixel includes a sub-pixel electrode (connected to the drain electrode of a sub-pixel's switching element) overlapped with the sub-pixel's storage electrode. A first predetermined voltage is applied to the first sub-pixel and second predetermined voltage is applied the second sub-pixel, and thus the first sub-pixel electrode may receive a voltage lower than the voltage of the second sub-pixel electrode. The first sub-pixel electrode may be larger in area than the second sub-pixel electrode. The overlapping area between the first drain electrode and the storage electrode of a first sub-pixel may be larger than the overlapping area between the drain electrode and the storage electrode of a second sub-pixel. Thus the kickback voltage of the first sub-pixel may be substantially the same as the kickback voltage of the second sub-pixel.