Liquid Crystal Display Sub-Pixel Electrode Pretilt Control
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Solution Overview
Problem
Liquid crystal displays in vertically aligned mode face challenges in achieving side visibility comparable to front visibility, particularly in gray expression, due to increased luminance at low or high grays, which deteriorates image quality and limits design freedom.
Innovation Solution
A liquid crystal display structure with sub-pixel electrodes on a substrate, featuring different pretilt angles for liquid crystal molecules in distinct regions, allowing for varying voltages and luminance across sub-regions within a pixel, while maintaining a common electrode and insulating layer, to control pretilt angles without altering the design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If one pixel is divided into two sub-pixels with different transmittance to improve side visibility, then side visibility is improved, but luminance increases at low or high gray levels causing deterioration of gray expression
Solution Approach 1:
The pixel electrode is divided into multiple sub-pixel electrodes (first sub-pixel electrode and second sub-pixel electrode) with different transmittance characteristics. Each sub-pixel electrode corresponds to different gray levels, allowing independent control of luminance in different regions to achieve accurate gray expression while maintaining improved side visibility.
Solution Approach 2:
Different regions of the pixel are assigned different transmittance properties through separate sub-pixel electrodes. The first sub-pixel electrode has different transmittance than the second sub-pixel electrode, creating local quality variations that enable precise control of luminance at different gray levels without affecting overall side visibility improvement.
2Ease of operation
If one pixel is divided into physical areas to improve side visibility, then side visibility is improved, but design freedom is reduced
Solution Approach 1:
The invention introduces controllable pretilt angles for liquid crystal molecules in different regions, adding a dynamic control parameter that does not require changing the physical structure or design of the pixel. This allows flexible adjustment of display characteristics while maintaining the sub-pixel division structure for side visibility improvement.
Solution Approach 2:
Instead of changing the physical design or structure, the invention achieves improved display performance by changing parameters - specifically, controlling the pretilt angles of liquid crystal molecules in different sub-pixel regions. This parameter-based approach maintains design freedom while achieving the desired side visibility and gray expression.
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 accurate gray expression and improved side visibility by varying pretilt angles, reducing luminance inconsistencies and enhancing display quality without changing the existing design, thus addressing the limitations of previous methods.
Implementation Method 1
a liquid crystal display in a vertically aligned mode in which major axes of the liquid crystal molecules are aligned to be vertical to the display panel
Implementation Method 2
polarization of incident light is controlled based on the generated electric field to display an image
Implementation Method 3
The field generating electrodes are applied with a voltage to generate an electric field in the liquid crystal layer and an alignment of liquid crystal molecules of the liquid crystal layer is determined based on the generated electric field
Implementation Method 4
liquid crystal molecules corresponding to a first region, a second region, and a third region are configured to have different pretilts
Data Source
AI summary
Disclosed herein is a liquid crystal display, including: a first substrate; a first sub-pixel electrode positioned on the first substrate including a first sub-region and a second sub-region; a second sub-pixel electrode positioned on the first substrate including a third sub-region and a fourth sub-region; and an insulating layer positioned between the first sub-region of the first sub-pixel electrode and the second sub-pixel electrode, wherein liquid crystal molecules corresponding to a first region in which the second sub-region of the first sub-pixel electrode is positioned, a second region in which the first sub-region of the first sub-pixel electrode and the third sub-region of the second sub-pixel electrode overlap each other, and a third region in which the fourth sub-region of the second sub-pixel electrode is positioned are configured to have different pretilts.