Light-Shielding Sealant for Display Panel Light Leakage
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Solution Overview
Problem
Liquid crystal display panels face issues with light leakage due to transparent sealants, leading to increased brightness in dark states and decreased contrast ratios, which affect image display quality.
Innovation Solution
An adhesive comprising a base bonding material and light-shielding particles with a degradable coating layer is used, where the degradable coating layer wraps a light-shielding material such as black ink or resin. The adhesive is cured and then treated to degrade the coating layer, exposing the light-shielding material, which diffuses into the sealant, providing a light-shielding property to prevent backlight emission through the sealing region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a transparent sealant is used to assemble the array substrate with the color filter substrate, then the bonding strength and assembly quality are improved, but light leakage occurs through the sealing region causing increased brightness in dark states and decreased contrast ratios
Solution Approach 1:
The sealant is formulated as a composite material containing a base bonding material and light-shielding particles. The light-shielding particles consist of a light-shielding material (such as black ink or black resin) wrapped by a degradable coating layer. This composite structure combines the bonding functionality of the base material with the light-shielding property of the particles, allowing the sealant to simultaneously provide strong adhesion and prevent light leakage through the sealing region.
Solution Approach 2:
The light-shielding property is introduced locally through the light-shielding particles dispersed within the sealant, rather than making the entire sealant opaque. The particles are distributed throughout the sealing region, providing localized light-shielding functionality while maintaining the overall transparency and bonding characteristics of the sealant matrix.
2Object-affected harmful factors
If light-shielding particles are added to the sealant to prevent light leakage, then the contrast ratio and image display quality are improved, but the manufacturing process complexity increases
Solution Approach 1:
The light-shielding particles are pre-formed with the degradable coating layer wrapping the light-shielding material before being incorporated into the sealant formulation. This preliminary preparation of the particles simplifies the subsequent manufacturing process, as the particles can be directly mixed into the sealant without requiring complex in-process assembly steps.
Solution Approach 2:
The degradable coating layer is designed to change its properties under specific conditions (such as temperature or chemical exposure) during the sealing process. This parameter change allows the coating layer to serve dual purposes: protecting the light-shielding material during storage and handling, and then degrading to release the light-shielding material into the sealant matrix, thereby simplifying the manufacturing process.
3Reliability
If the degradable coating layer is used to wrap the light-shielding material, then the light-shielding material is protected during storage and handling, but an additional degrading treatment step is required after assembly
Solution Approach 1:
The degradable coating layer is designed to change its properties under specific conditions (such as temperature or chemical exposure) during the sealing process. This parameter change allows the coating layer to serve dual purposes: protecting the light-shielding material during storage and handling, and then degrading to release the light-shielding material into the sealant matrix, thereby simplifying the manufacturing process.
Solution Approach 2:
The degradable coating layer serves a continuous useful action throughout the manufacturing and assembly process. It first provides protection during storage and handling, then degrades to enable the light-shielding material to function within the sealant. This continuous functionality eliminates the need for separate protection and release steps, improving manufacturing efficiency.
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 solution effectively reduces brightness in dark states, increases contrast ratios, and improves image display quality by preventing light leakage through the sealing region of the display panel.
Implementation Method 1
the degradable coating layer includes a photodegradable plastic
Implementation Method 2
the degradable coating layer includes a thermally degradable plastic
Implementation Method 3
the light-shielding material includes a black ink or a black resin
Data Source
AI summary
An adhesive, a display panel and a manufacturing method thereof, and a display device are provided. The adhesive includes a base bonding material and a light-shielding particle, and the light-shielding particle includes a degradable coating layer and a light-shielding material wrapped by the degradable coating layer.