Liquid Crystal Display Subpixel Voltage Control for Lateral Visibility
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Solution Overview
Problem
Vertical alignment mode LCDs suffer from decreased lateral visibility, where the screen appearance differs significantly when viewed from the side compared to the front.
Innovation Solution
The liquid crystal display is designed with three subpixels per pixel, each receiving different voltages, and includes specific electrode configurations and light blocking members to enhance lateral visibility by adjusting the charge voltages and electrode layouts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If vertical alignment mode LCD is used to achieve high contrast ratio and wide reference viewing angle, then contrast ratio and front viewing angle are improved, but lateral visibility deteriorates
Solution Approach 1:
The pixel electrode is divided into multiple sub-pixel electrodes (first, second, and third subpixel electrodes) arranged in the lateral direction. Each sub-pixel electrode is independently controlled with different voltages to compensate for viewing angle-dependent color shifts and improve lateral visibility while maintaining the vertical alignment mode structure.
Solution Approach 2:
Different voltage levels are applied to different sub-pixel electrodes based on their positions. The first subpixel electrode receives a first voltage, the second subpixel electrode receives a second voltage, and the third subpixel electrode receives a third voltage, creating local variations in electrical characteristics to optimize display performance at different viewing angles.
2Adaptability or versatility
If multiple subpixel electrodes with different voltages are implemented to improve lateral visibility, then viewing angle performance is improved, but device complexity increases
Solution Approach 1:
The storage capacitor electrodes are merged with the sub-pixel electrode structures. The first storage electrode line overlaps with the first subpixel electrode, the second storage electrode line overlaps with the second subpixel electrode, and the third storage electrode line overlaps with the third subpixel electrode, integrating storage functionality into the existing electrode layout without requiring separate capacitor structures.
Solution Approach 2:
The sub-pixel electrodes serve dual functions: they act as display electrodes for image formation and as one terminal of the storage capacitors. This multi-functionality reduces the overall number of components needed while achieving both display and memory functions.
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 improves lateral visibility by ensuring that the image appearance when viewed from the side is similar to that at the front, enhancing the display's overall viewing experience.
Implementation Method 1
Voltages applied to the field generating electrodes generate an electrical field in the liquid crystal layer and, change the orientations of liquid crystal molecules of the liquid crystal layer and control polarization of incident light to display an image
Implementation Method 2
change the orientations of liquid crystal molecules of the liquid crystal layer and control polarization of incident light
Data Source
AI summary
A liquid crystal display includes: a substrate; a gate line, a data line, a first storage electrode line, and a second storage electrode line positioned on the substrate; a first thin film transistor, a second thin film transistor, and a third thin film transistor connected to the gate line and the data line; a fourth thin film transistor connected to the gate line, the third thin film transistor, and the second storage electrode line; a first subpixel electrode connected to the first thin film transistor; a second subpixel electrode connected to the second thin film transistor; a third subpixel electrode connected to the third thin film transistor; and a storage electrode connected to the first storage electrode line and overlapping the first subpixel electrode. Different voltages are applied to the three subpixels to improve lateral visibility of the liquid crystal display.