Liquid Crystal Display Pixel Electrode Asymmetry
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Solution Overview
Problem
Liquid crystal display devices exhibit uneven luminance for different colors when viewed from various angles due to undesirable distribution of liquid crystal molecule directions, leading to unsatisfactory image viewing experiences.
Innovation Solution
The liquid crystal display device incorporates a configuration with multiple pixel areas and electrodes, where each pixel group consists of adjacent pixel areas with specific branch electrode orientations, ensuring systematic distribution of liquid crystal molecule directions to maintain equal luminance across viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional pixel electrode configurations are used, then device complexity is reduced, but luminance uniformity across viewing angles deteriorates
Solution Approach 1:
The pixel electrode is divided into multiple segments (first pixel electrode, second pixel electrode, third pixel electrode, fourth pixel electrode) with different branch electrode configurations. Each segment has stem electrodes and branch electrodes oriented at specific angles (e.g., first branch electrode at first acute angle, second branch electrode at second acute angle) to create systematic distribution of liquid crystal molecule directions across different viewing angles, thereby achieving uniform luminance.
Solution Approach 2:
Adjacent pixel electrodes are configured with asymmetric branch electrode orientations. For example, the first pixel electrode has branch electrodes at certain angles while the second pixel electrode has branch electrodes at different angles, creating complementary asymmetric patterns that collectively achieve uniform luminance distribution across all viewing angles.
2Illumination intensity
If branch electrodes are oriented at multiple angles, then liquid crystal molecule directions are systematically distributed, but manufacturing precision requirements increase
Solution Approach 1:
The electrode structure is segmented into distinct components (stem electrodes, first branch electrodes, second branch electrodes) with clearly defined orientation angles. This segmentation allows for systematic control of liquid crystal molecule directions at different angles, achieving uniform luminance while providing clear manufacturing guidelines for each segment's orientation.
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 ensures that the luminance in the image remains consistent across right and left viewing angles, providing a satisfactory image viewing experience by systematically distributing liquid crystal molecule directions among different color pixel areas.
Implementation Method 1
The field generating electrodes may apply an electric field on the liquid crystal layer to control directions of liquid crystal molecules in the liquid crystal layer for controlling transmission of light
Data Source
AI summary
A display device may include the following elements: a first color filter, which has a first color; a first pixel electrode, which overlaps the first color filter and includes a first stem electrode and a first branch electrode, wherein the first branch electrode is oriented at an acute angle with respect to the first stem electrode; a second color filter, which has a second color different from the first color; and a second pixel electrode, which overlaps the second color filter, immediately neighbors the first pixel electrode, and includes a second stem electrode and a second branch electrode, wherein the second stem electrode is aligned with the first stem electrode, and wherein a shape of a combination of the second stem electrode and the second branch electrode is a mirror image of a shape of a combination of the first stem electrode and the first branch electrode.