Liquid Crystal Display Subpixel Electrode for Gray Expression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Vertically aligned liquid crystal displays face challenges in maintaining image quality, particularly in low gray regions, where side visibility is difficult to match front visibility, leading to deteriorated transmittance and gray expression.
Innovation Solution
A liquid crystal display design featuring a first and second subpixel electrode with a plate region and minute branch region, where the first subpixel electrode includes a horizontal and vertical stem with obliquely extended branches, and the second subpixel electrode has a rectangular plane with extended branches, both on the same layer, allowing for varying voltages across different regions of a pixel to control liquid crystal alignment and transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If one pixel is divided into two subpixels and different voltages are applied to provide side visibility, then side visibility is improved, but luminance is increased at low gray or high gray, making gray expression difficult and image quality deteriorates
Solution Approach 1:
The first subpixel electrode is segmented into a plate region and a minute branch region, allowing different voltage applications in different areas. The plate region receives a first voltage while the minute branch region receives a second voltage, enabling independent control of luminance in different regions to achieve accurate gray expression while maintaining side visibility.
Solution Approach 2:
Different regions of the subpixel electrode are assigned different functional qualities. The plate region is optimized for one function while the minute branch region is optimized for another, allowing localized control over electrical characteristics and optical performance in different areas of the pixel.
2Adaptability or versatility
If different voltages are applied to subpixels to approximate side visibility to front visibility, then viewing angle is improved, but transmittance deteriorates
Solution Approach 1:
The electrode structure extends into a third dimension by adding minute branches that protrude from the plate region. This dimensional expansion allows for increased surface area and more complex voltage distribution patterns, enabling improved viewing angle characteristics while managing transmittance through optimized geometric configuration.
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 design enables accurate gray expression in low gray regions while maintaining side visibility comparable to front visibility, preventing transmittance deterioration and enhancing overall image quality.
Implementation Method 1
The liquid crystal display generates an electric field in the liquid crystal layer by applying voltage to the field generating electrodes
Implementation Method 2
The alignment of liquid crystal molecules of the liquid crystal layer is determined by the generated electric field, thus controlling polarization of incident light
Implementation Method 3
a vertically aligned mode liquid crystal display, in which long axes of liquid crystal molecules are aligned to be vertical to the display panels without applying the electric field
Data Source
AI summary
Provided is a liquid crystal display including: a first insulation substrate; a thin film transistor positioned on the first insulation substrate; a first subpixel electrode positioned on the thin film transistor and to which a first voltage is applied; a second subpixel electrode positioned on the thin film transistor and to which a second voltage is applied; a second insulation substrate facing the first insulation substrate; a common electrode positioned on the second insulation substrate and receiving a common voltage; and a liquid crystal layer disposed between the first insulation substrate and the second insulation substrate, in which the first subpixel electrode includes a plate region and a minute branch region overlapping the plate region with a passivation layer between the plate region and the minute branch region, and the plate region and the second subpixel electrode are positioned on a same layer.