Liquid Crystal Display Light-Blocking Layer UV Curing
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Solution Overview
Problem
In the manufacturing of liquid crystal displaying panels, particularly in PSVA type displays, pre-reaction of reactive monomers due to ultraviolet light irradiation during the curing process can lead to defects, as some UV light is diffracted and irradiates the liquid crystals, causing misalignment and defects in the panel.
Innovation Solution
A light-blocking layer made of indium tin oxide is introduced between the displaying area and the sealant-coating area, which absorbs and blocks ultraviolet light, preventing it from reaching the liquid crystal layer and thus avoiding pre-reaction of the reactive monomers. This layer is formed simultaneously with the pixel electrode layer, simplifying the manufacturing process and ensuring no electrical interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a photomask is used to cover the liquid crystal area during UV curing, then the sealant can be cured effectively, but ultraviolet light is diffracted at the edge of the photomask and irradiates the liquid crystals, causing pre-reaction of reactive monomers and panel defects
Solution Approach 1:
The patent introduces a light-blocking layer as an intermediary component between the pixel electrode layer and the liquid crystal layer. This light-blocking layer specifically blocks diffracted UV light from reaching the liquid crystal layer, preventing pre-reaction of reactive monomers while allowing the curing process to proceed effectively.
Solution Approach 2:
The patent segments the electrode structure into three distinct parts: the pixel electrode layer for electrical function, the light-blocking layer for optical protection, and the liquid crystal layer for display function. This segmentation allows each layer to perform its specific function without interfering with others, particularly protecting against UV diffraction.
2Object-affected harmful factors
If the light-blocking layer is positioned close to the pixel electrode layer, then it effectively blocks diffracted UV light, but it may contact the pixel electrode layer and cause electrical interference
Solution Approach 1:
The patent extracts the light-blocking function from the pixel electrode layer by creating a separate light-blocking layer. This allows the pixel electrode layer to maintain its electrical conductivity without the risk of electrical interference, while the light-blocking layer provides optical protection. The two layers are kept adjacent but non-contacting.
3Reliability
If additional layers are added to block UV light, then pre-reaction of reactive monomers is prevented, but the manufacturing process becomes more complex
Solution Approach 1:
The patent merges the light-blocking layer formation with the existing pixel electrode layer deposition process. Both layers are formed simultaneously in the same manufacturing step using the same equipment, which eliminates the need for additional processing steps and maintains manufacturing efficiency while providing defect prevention.
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
The light-blocking layer effectively prevents UV light from affecting the liquid crystal layer, reducing defects in the liquid crystal displaying panel and ensuring accurate alignment of liquid crystal molecules, thereby enhancing the panel's performance and reliability.
Implementation Method 1
a light-blocking layer arranged between the displaying area and the sealant-coating area... which absorbs and blocks ultraviolet light
Implementation Method 2
due to the refraction of the light occurred at the edge of the photomask, a part of ultraviolet light may be diffracted and irradiate the area corresponding to the liquid crystals
Data Source
AI summary
The present disclosure provides a liquid crystal displaying panel, which includes a first substrate having a displaying area and a sealant-coating area surrounding the displaying area and a light-blocking layer arranged between the displaying area and the sealant-coating area. The light-blocking layer can absorb and block ultraviolet light to prevent the ultraviolet light from affecting the liquid crystal layer. Additionally, the light-blocking layer and the pixel electrode layer are formed in the same process, that is, the light-blocking layer is simultaneously formed when the pixel electrode layer is formed. A thickness of the light-blocking layer is equal to that of the pixel electrode layer. Since the thickness of the light-blocking layer is equal to that of the pixel electrode layer, the pixel electrode layer and the light-blocking layer can be formed in the same process, which simplifies the manufacturing process of the light-blocking layer and the needed equipment.