Display Substrate Asymmetric Slit Patterns for Viewing Angle
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Solution Overview
Problem
Liquid crystal display (LCD) devices, particularly in the plane-to-line switching (PLS) mode, face challenges with narrow viewing angles due to color shift and reduced light transmittance caused by domain boundaries in multi-domain structures.
Innovation Solution
A display substrate design with specific electrode configurations, including slit patterns and alignment layers, is implemented to enhance viewing angles and light transmittance by forming symmetric domains across pixels, using gamma reference voltage groups to compensate for luminance differences and improve visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multi-domain structure is used to widen viewing angle, then viewing angle is improved, but color shift occurs and light transmittance is reduced
Solution Approach 1:
The patent applies asymmetry by configuring different slit patterns in different domains. Specifically, a first domain has a first slit pattern while a second domain has a second slit pattern, creating asymmetric domain structures that control light transmission differently in each domain to prevent color shift while maintaining wide viewing angle
Solution Approach 2:
The patent segments the pixel electrode into multiple domains with different slit patterns. Each domain is independently configured with specific slit orientations (e.g., first slit pattern at first angle, second slit pattern at second angle) to create distinct light transmission characteristics that eliminate color shift across different viewing angles
2Adaptability or versatility
If a multi-domain structure is used to widen viewing angle, then viewing angle is improved, but light transmittance is reduced
Solution Approach 1:
The patent applies local quality by configuring different slit patterns in different local domains of the pixel. Each domain has optimized slit characteristics (orientation, density) tailored to its specific position and function, allowing different parts of the pixel to contribute differently to overall light transmission while collectively achieving wide viewing angle and high brightness
3Adaptability or versatility
If slit patterns are added to electrodes to control domains, then viewing angle is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by using the same basic electrode structure (upper electrode and lower electrode) across all domains, but varying only the slit pattern configuration. This maintains structural simplicity and manufacturing ease while achieving complex domain control functionality through pattern variation rather than structural complexity
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
The solution effectively improves viewing angles and visibility by minimizing color shift and maintaining high light transmittance, while the use of gamma reference voltage groups ensures balanced luminance across the display panel.
Implementation Method 1
an alignment layer on the insulating substrate on which the first and the second upper electrodes may be located. The alignment direction of the alignment layer in the first pixel region may be same as that of the alignment layer in the second pixel region.
Implementation Method 2
The LCD device may display an image by adjusting the transmittance of light passing through the liquid crystal layer, through realignment of liquid crystal molecules in the liquid crystal layer, in response to a voltage applied to the electric field generating electrodes.
Implementation Method 3
A liquid crystal display (LCD) device typically includes a liquid crystal layer disposed between two insulating substrates on which electric field generating electrodes are formed, respectively.
Data Source
AI summary
A display substrate includes an insulating substrate, a first gate line, a first lower electrode, a second lower electrode, a first upper electrode, and a second upper electrode. The insulating substrate includes a first pixel region and a second pixel region located at a first direction from the first pixel region. The first gate line extends in a second direction crossing the first direction on the insulating substrate. The first and the second lower electrodes are in the first and the second pixel regions, respectively. The first upper electrode overlaps the first lower electrode in the first pixel region and includes a first slit pattern extending in a third direction different from the first and the second directions. The second upper electrode overlaps the second lower electrode in the second pixel region and includes a second slit pattern extending in a fourth direction different from the first to the third directions.