Liquid Crystal Display Sub-Pixel Segmentation for Wide Viewing Angles
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Solution Overview
Problem
Liquid crystal displays suffer from color shift issues at large viewing angles due to variations in brightness of sub-pixels when viewed from different angles, leading to impaired image quality.
Innovation Solution
The implementation of sub-pixels with two display fields having different transmittances, achieved through varying cell gaps and common electrode voltages, ensures that the overall gray level remains consistent across a wide range of viewing angles by modulating backlight luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional liquid crystal display uses uniform sub-pixel structure, then the device complexity is low, but the viewing angle is limited and color shift occurs at large angles
Solution Approach 1:
The patent divides each sub-pixel into multiple display fields (e.g., first display field and second display field) with different transmittance characteristics. This segmentation allows each field to contribute differently to the overall display performance, enabling wider viewing angles while maintaining manageable structural complexity through systematic division rather than complete redesign
Solution Approach 2:
Different display fields within the same sub-pixel are assigned different transmittance values and optical characteristics. The first display field may have different transmittance than the second display field, creating local quality variations that compensate for viewing angle effects. This localized differentiation allows the display to maintain uniform appearance across different viewing angles without requiring complete structural complexity
2Adaptability or versatility
If sub-pixels have different transmittances to correct color shift, then the viewing angle performance improves, but the manufacturing precision requirements increase
Solution Approach 1:
The patent achieves different transmittances in different display fields by adjusting controllable parameters such as cell gap thickness, common electrode voltage, or liquid crystal layer properties. Rather than requiring precise manufacturing of complex structures, the invention uses parameter variations (e.g., different cell gap sizes or voltage levels) to achieve the desired transmittance differences, thereby reducing manufacturing precision requirements while maintaining color shift correction performance
3Stability of the object's composition
If multiple display fields with different characteristics are used, then the image quality uniformity improves, but the circuit design complexity increases
Solution Approach 1:
The patent designs the display fields to share common driving mechanisms and control structures. Multiple display fields can be driven by the same pixel electrode and common electrode arrangement, with the primary differences being optical characteristics (transmittance, cell gap) rather than complete circuit redesign. This multi-functionality approach maintains image quality uniformity while avoiding proportional increases in circuit design 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
This approach reduces color shift and maintains uniform image quality by adjusting the transmittances of sub-pixels to match intended luminance levels, even when viewed from angles, without requiring additional materials or complex circuit designs.
Implementation Method 1
liquid crystal layers in the first and second display fields to have different transmittances
Implementation Method 2
When a pixel voltage corresponding to a particular gray level is applied to the sub-pixel, the first display field shows a gray level darker than the particular gray level, the second display field shows a gray level lighter than the particular gray level
Data Source
AI summary
A liquid crystal display includes sub-pixels each having a first display field and a second display field that both operate in a transmissive mode or both operate in a reflective mode. The first and second display fields of a sub-pixel are driven by a same driving device. The first and second display fields of a sub-pixel have different characteristics that cause liquid crystal layers in the first and second display fields to have different transmittances, the difference in transmittances of the first and second display fields being larger than a predetermined value.