Three-Region Pixel Electrode Design for VA Display Side Visibility
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Solution Overview
Problem
Vertically aligned liquid crystal displays face challenges in achieving side visibility similar to front visibility and accurate gray scale expression, particularly at low gray scales, leading to reduced picture quality and texture issues in curved display devices due to panel shifts.
Innovation Solution
A display device design that divides one pixel into three parts with different voltage applications to the first subpixel electrode, second subpixel electrode, and common electrode, ensuring a voltage difference between the first and common voltages is greater than between the second and common voltages, with branch parts extending in different directions to control electric field intensities and reduce texture appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If one pixel is divided into two subpixels to make side visibility similar to front visibility, then side visibility is improved, but luminance becomes high at low and high gray scales making gray scale expression difficult
Solution Approach 1:
The pixel is divided into three distinct regions (first subpixel electrode region, second subpixel electrode region, and common electrode region) instead of the conventional two subpixels. Each region applies different voltages to create three different transmittances, enabling both improved side visibility and accurate gray scale expression through the additional degree of freedom provided by the third region.
Solution Approach 2:
Different regions within the pixel are assigned different voltage levels and transmittance characteristics. The first subpixel electrode region, second subpixel electrode region, and common electrode region each have locally optimized properties to control light transmission differently, allowing simultaneous optimization of side visibility and gray scale expression across various viewing conditions.
2Reliability
If a vertically aligned mode liquid crystal display is used to achieve large contrast ratio and wide reference viewing angle, then contrast ratio and reference viewing angle are improved, but side visibility differs from front visibility
Solution Approach 1:
The pixel structure is segmented into three functional regions with different voltage applications, creating multiple transmittance levels that compensate for the viewing angle limitations of vertically aligned liquid crystal modes. This segmentation allows the display to maintain high contrast ratio while improving side visibility through differential transmittance control.
Solution Approach 2:
The invention changes the voltage parameters applied to different regions of the pixel, creating a voltage gradient across the three regions. By applying different voltages to the first subpixel electrode, second subpixel electrode, and common electrode, the system adjusts light transmission characteristics to improve side visibility while preserving the high contrast ratio inherent to vertically aligned liquid crystal displays.
3Measurement precision
If branch parts of electrodes extend in different directions to control electric field intensities, then gray scale expression is improved, but device complexity increases
Solution Approach 1:
The electrode structure is divided into segmented regions (first subpixel electrode with branch parts, second subpixel electrode, common electrode) where each segment serves a specific function. The branch parts extending in different directions create controlled electric field intensities in each region, enabling precise gray scale expression while maintaining manageable structural complexity through functional segmentation.
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 enables side visibility similar to front visibility and accurate gray scale expression at low gray scales, while minimizing texture generation in curved display devices by controlling electric field intensities and luminance across different parts of the pixel.
Implementation Method 1
a first voltage is applied to the first subpixel electrode and a second voltage is applied to the second subpixel; a voltage difference between the first voltage and the common voltage is larger than a voltage difference between the second voltage and the common voltage
Implementation Method 2
A liquid crystal display is one of the widely used flat panel displays presently and includes two display panels on which field generating electrodes, such as a pixel electrode and a common electrode, are formed, and a liquid crystal layer between the two display panels
Data Source
AI summary
A display device includes: a first insulation substrate; an insulating layer disposed on the first insulation substrate; a pixel electrode including a first subpixel electrode including a first subregion electrode disposed on the insulating layer and a second subregion electrode disposed below the insulating layer, and a second subpixel electrode disposed on the insulating layer, wherein a first voltage is applied to the first subpixel electrode and a second voltage is applied to the second subpixel; a second insulation substrate facing the first insulation substrate; and a common electrode disposed on the second insulation substrate and configured to receive a common voltage, wherein the second subregion electrode overlaps a portion of the second subpixel electrode.