Display Panel Spacer Bosses Prevent Alignment Film Scratches
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Solution Overview
Problem
Liquid crystal display panels face issues with spacer-induced defects such as light leakage due to relative displacement under external forces, which can lead to alignment film scratches and reduced aperture ratio and light transmittance, as existing solutions like increasing the black matrix width compromise the display's performance.
Innovation Solution
The display panel design incorporates a first and second substrate with strategically arranged spacers, bosses, and a black matrix configuration that prevents spacers from scratching the alignment film during displacement, maintaining uniform cell gaps and avoiding the need for increased black matrix width, thus enhancing aperture ratio and light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the black matrix width is increased to prevent spacer-induced defects, then the reliability is improved, but the aperture ratio and light transmittance deteriorate
Solution Approach 1:
The patent introduces bosses as intermediary structures between the spacers and the alignment film. These bosses act as protective mediators that prevent the spacers from directly contacting and scratching the alignment film, thereby eliminating the need to increase the black matrix width to prevent spacer-induced defects.
Solution Approach 2:
The patent segments the protective function by separating it from the black matrix and assigning it to dedicated boss structures. This segmentation allows the black matrix to maintain its original width for optimal aperture ratio while the bosses provide the protective function against spacer-induced alignment film damage.
2Reliability
If the black matrix width is increased to prevent alignment film scratches, then the reliability is improved, but the light transmittance deteriorates
Solution Approach 1:
The bosses serve as intermediary protective structures that prevent spacers from scratching the alignment film. This intermediary protection mechanism allows the black matrix to maintain its original width, thereby preserving light transmittance while still preventing alignment film damage.
Solution Approach 2:
The protective function is extracted from the black matrix and assigned to separate boss structures. This extraction allows the black matrix to focus solely on its electrical function with optimal width for light transmittance, while the bosses provide the protective function against spacer-induced defects.
3Reliability
If the spacer arrangement is optimized to prevent alignment film scratches, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The patent segments the protective function into dedicated boss structures positioned at specific locations where spacers may contact the alignment film. This segmentation provides targeted protection without requiring complex overall spacer rearrangement, maintaining relatively simple device structure while improving reliability.
Solution Approach 2:
The bosses are pre-positioned on the substrate before spacer placement, creating a protective framework in advance. This preliminary action ensures that when spacers are subsequently placed, they automatically rest on the bosses rather than directly on the alignment film, preventing scratches without requiring complex spacer arrangement.
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 prevents spacer-induced defects by supporting the substrates during displacement and maintaining alignment film integrity, improving the display panel's reliability and performance without compromising aperture ratio or light transmittance.
Implementation Method 1
a spacer (referred to as PS) with elastic resilience is usually provided between the array substrate and the opposite substrate. The spacer is in a compressed state and functions to support the liquid crystal cell, so as to keep the cell gap of the liquid crystal display panel be stable and uniform.
Data Source
AI summary
A display panel and a display device are provided. The display panel includes a first substrate and a second substrate. The first substrate includes: a first base substrate; and a plurality of spacers on the first base substrate, including a first sub spacer and a second sub spacer; and the second substrate includes: a second base substrate; a gate line; a plurality of sub-pixels on the second base substrate; a first boss and a second boss on the second base substrate. The second substrate includes a first row of pixels and a second row of pixels adjacent to the first row of pixels; an orthographic projection of the second boss and an orthographic projection of the gate line on the second base substrate overlap; an orthographic projection of the first sub spacer and an orthographic projection of the first boss on the second base substrate at least partially overlap.