Liquid Crystal Display Black Matrix Film Adhesion Structure
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Solution Overview
Problem
Liquid crystal display panels face issues with bubble generation and light leakage due to peeling-off of the black matrix film at the interface between the electrode substrate and the light shielding film, leading to reduced display quality and reliability, especially in vehicle-loaded devices.
Innovation Solution
The implementation of a liquid crystal display device with a sealing material surrounded by a first and second organic resin film, where the first film is formed in a planar shape until the middle position and then in a slit shape, enhancing the adhesion area between the substrate and the second organic resin film, thereby preventing peeling-off and stabilizing the sealing gap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a black matrix film is formed on the electrode substrate to prevent light leakage, then light leakage is suppressed, but the film peels off at the interface with the light shielding film causing bubble generation and reduced reliability
Solution Approach 1:
An organic resin film is introduced as an intermediary layer between the black matrix film and the light shielding film. This intermediate layer prevents direct contact between the black matrix film and the light shielding film, eliminating the peeling issue while maintaining the light leakage prevention function of the black matrix film.
Solution Approach 2:
The patent uses a composite structure consisting of multiple layers: electrode substrate, black matrix film, organic resin film, and light shielding film. This composite material approach allows each layer to perform its specific function while the organic resin film provides adhesion stability to the entire structure.
2Reliability
If the adhesion area between the substrate and organic resin film is increased, then interface peeling is prevented and reliability is improved, but the device structure becomes more complex
Solution Approach 1:
The organic resin film extends not only in the planar direction but also in the thickness direction, forming a stepped structure. This dimensional extension allows the film to overlap with both the black matrix film and the light shielding film, significantly increasing the adhesion area without requiring additional complex components.
Solution Approach 2:
The organic resin film is divided into multiple regions with different functions: a first region that overlaps with the black matrix film to prevent peeling, and a second region that extends to overlap with the light shielding film to provide additional adhesion and sealing. This segmentation allows each region to optimize its adhesion function.
Data Source
AI summary
The present invention provides a liquid crystal display device which can enhance quality and reliability of image display by preventing the generation of bubbles in the inside of a liquid crystal display panel and, at the same time, by suppressing leaking of light from an end of a black matrix film. In the liquid crystal display panel which sandwiches a liquid crystal layer between two glass substrates, the liquid crystal layer is surrounded by a sealing material having a predetermined width. On one glass substrate, a black matrix film and an overcoat film are arranged from one-glass-substrate side such that the black matrix film and the overcoat film overlap the sealing material. The black matrix film is, in the widthwise direction of the sealing material, formed into a planar flat black matrix film until a middle position of the sealing material from a side on which the liquid crystal layer is arranged, and is formed into a slit-shaped slit black matrix film from the middle position. Due to such a constitution, an adhesion area between the glass substrate and the overcoat film under an applied region of the sealing material is enlarged and hence, an adhesion strength is increased thus largely enhancing an adhesion strength.