Liquid Crystal Display Black Matrix UV Curing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The use of ultraviolet-curing sealing materials in liquid crystal display elements for dropping injection methods results in insufficient curing due to insufficient radiation, leading to reduced reliability and display quality, especially when the black matrix obstructs UV rays, causing light leakage and decreased contrast.
Innovation Solution
A liquid crystal display element design where the overlapping width of the frame-like ultraviolet curing sealing material and the black matrix is minimized to less than 0.2 mm, allowing sufficient UV radiation for curing, and the black matrix is patterned to include light-transmitting portions to reduce optical density and prevent light leakage, ensuring reliable sealing and display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the black matrix is arranged to surround the display region to prevent light leakage, then display quality and contrast are improved, but ultraviolet ray radiation to the sealing material becomes insufficient causing curing problems
Solution Approach 1:
The black matrix is segmented by forming light-transmitting portions (openings) in the peripheral region, allowing ultraviolet rays to pass through while maintaining light-blocking function in the display region. This segmentation resolves the contradiction by creating zones with different optical properties within the same structure.
Solution Approach 2:
The black matrix has different properties in different regions: the display region maintains high light-blocking capability for contrast, while the peripheral region has light-transmitting portions to allow UV radiation. This local differentiation of properties resolves the contradiction between display quality and curing reliability.
2Reliability
If the overlapping width of the black matrix and sealing material is reduced to allow UV radiation, then curing reliability is improved, but light leakage may increase affecting display quality
Solution Approach 1:
The black matrix is divided into a display region with continuous light-blocking structure and a peripheral region with light-transmitting portions. This segmentation allows the overlapping width to be reduced in the peripheral region for UV transmission while maintaining adequate light-blocking in the display region.
Solution Approach 2:
Different overlapping widths are implemented in different regions: the display region maintains sufficient overlap for light-blocking, while the peripheral region has reduced overlap with light-transmitting portions to allow UV radiation through the sealing material.
3Productivity
If the dropping injection method is used to shorten manufacturing steps, then productivity is improved, but only ultraviolet-curing sealing materials can be used which require sufficient UV radiation
Solution Approach 1:
The optical parameters of the black matrix are changed by introducing light-transmitting portions in the peripheral region, increasing ultraviolet ray transmission. This parameter change enables the use of ultraviolet-curing sealing materials required by the dropping injection method while maintaining productivity improvements.
4Illumination intensity
If the black matrix is made dense to prevent light leakage, then display quality is improved, but ultraviolet ray transmission is blocked reducing curing effectiveness
Solution Approach 1:
The black matrix is segmented into dense light-blocking regions for display quality and less dense light-transmitting portions for UV transmission. This segmentation allows the structure to perform both functions simultaneously by optimizing density in different zones.
Solution Approach 2:
The black matrix exhibits different densities in different regions: high density in the display region for light-blocking and low density with openings in the peripheral region for UV transmission. This local quality differentiation resolves the contradiction between display quality and UV transmission.
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 enables the use of the dropping injection method to shorten manufacturing steps while maintaining high display quality and reliability by ensuring proper curing of the ultraviolet-curing sealing material and minimizing light leakage.
Implementation Method 1
a frame-like sealing material which is made of an ultraviolet curing material... the curing of the ultraviolet-curing sealing material... radiation quantity of ultraviolet rays to the ultraviolet-curing sealing material
Data Source
AI summary
In manufacturing a liquid crystal display element which includes a black matrix, in curing an ultraviolet curing sealing material after filling liquid crystal using a dropping injection method, there has been a possibility that a radiation quantity of ultraviolet rays to the sealing material is insufficient and hence, the curing is not sufficiently performed thus largely lowering the reliability of the liquid crystal display element. According to the present invention, an overlapping width of a frame-like sealing material and a black matrix on a peripheral portion along a display region is suppressed to 0.2 mm or less, or a region of the black matrix which is overlapped to the frame-like sealing member is patterned to include a light transmitting portion.