Liquid Crystal Display Wall-like Sub-spacers Light Leakage
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Solution Overview
Problem
Liquid crystal display devices with integrated touch panels face challenges in preventing color mixture due to light leakage from slits in the common electrodes, which affects the aperture ratio and pixel brightness, especially as pixel sizes are reduced for higher definition.
Innovation Solution
The implementation of wall-like sub-spacers and light attenuation layers that overlap the slits between common electrodes and video signal lines, combined with auxiliary wiring, to attenuate light leakage and prevent color mixture between adjacent pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the common electrode is divided into segments along video signal lines to serve as touch panel electrodes, then the touch panel function is integrated, but light leakage occurs from the slits causing color mixture between adjacent pixels
Solution Approach 1:
The patent introduces wall-like sub-spacers as intermediary structures positioned at the slits between segmented common electrodes. These sub-spacers act as mediators that block oblique light rays from passing through the slits to adjacent pixels, thereby preventing color mixture while maintaining the integrated touch panel functionality. The sub-spacers are strategically placed to intercept light paths without interfering with the electrical conduction of the common electrodes.
2Measurement precision
If the pixel size is reduced to achieve higher definition, then the display resolution is improved, but color mixture increases due to light leakage to adjacent pixels
Solution Approach 1:
The patent extracts the light-blocking function from the traditional black matrix structure and relocates it to wall-like sub-spacers positioned specifically at the slit regions. This extraction allows the black matrix to focus on its primary function of defining pixel boundaries, while the sub-spacers handle the light leakage prevention. This separation enables effective color mixture prevention even with reduced pixel sizes in high-definition displays.
3Object-affected harmful factors
If the width of the light-shielding film is increased to prevent color mixture, then color mixture is reduced, but pixel opening sizes are reduced affecting brightness
Solution Approach 1:
The patent applies light-shielding properties locally at the slit regions using wall-like sub-spacers, rather than increasing the width of light-shielding films across entire pixel boundaries. This localized approach blocks oblique light rays only where they leak through slits, while preserving the full aperture area of each pixel for light transmission. Consequently, color mixture is prevented without compromising pixel brightness.
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 effectively reduces color mixture by blocking oblique light rays from the backlight, maintaining high precision and brightness while allowing for higher definition displays.
Implementation Method 1
the wall-like sub-spacers can attenuate light leakage from the slits, and thus it is possible to prevent color mixture of colored layers adjacent in the first direction
Data Source
AI summary
A first substrate includes a plurality of pixel electrodes, a plurality of common electrodes on which slits are disposed at predetermined intervals in a first direction and which extend in a second direction, and a plurality of auxiliary wirings that are in contact with and overlap the common electrodes. A second substrate includes a plurality of spacers, a plurality of wall-like sub-spacers, and a color filter layer in which adjacent pixels have different colors from each other. The wall-like sub-spacers are disposed at positions that overlap the slits.