Light Conversion Film Absorbs UV Light in LCD Panels
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Solution Overview
Problem
In liquid crystal display panels, residual reactive monomers in the liquid crystal layer undergo polymerization when exposed to ultraviolet light from the backlight, altering the pretilt angle and causing afterimages during the reliability verification process.
Innovation Solution
A light conversion film layer is interposed between the backlight and the liquid crystal layer to absorb ultraviolet light, preventing reactive monomers from undergoing polymerization and maintaining the pretilt angle stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a backlight containing UV light is used to illuminate the liquid crystal layer, then the liquid crystal display can achieve sufficient brightness and visibility, but the remaining reactive monomers in the liquid crystal layer undergo polymerization reactions that alter the pretilt angle and produce afterimages
Solution Approach 1:
The patent introduces a light conversion film as an intermediary layer between the backlight and liquid crystal layer. This film absorbs UV light and converts it to visible light, preventing direct UV exposure to reactive monomers while maintaining display brightness. The light conversion film acts as a mediator that resolves the conflict between illumination requirements and polymerization prevention.
Solution Approach 2:
The patent converts the harmful UV light from the backlight into beneficial visible light through the light conversion film. The UV light that would otherwise cause polymerization and afterimages is transformed into visible wavelengths that contribute to display brightness, turning a harmful effect into a useful function.
2Reliability
If the liquid crystal layer is exposed to UV light during the reliability verification process, then the polymerization reaction of reactive monomers occurs, but this changes the pretilt angle and causes afterimage formation
Solution Approach 1:
The light conversion film serves as a protective intermediary during reliability verification testing. It allows the verification process to proceed with proper illumination while blocking UV light that would cause polymerization and pretilt angle changes, ensuring accurate testing without compromising liquid crystal stability.
Solution Approach 2:
The light conversion film is pre-installed in the display structure before reliability verification testing begins. This preliminary protective measure ensures that when UV light is present during testing, the conversion to visible light has already occurred, preventing polymerization before it can affect the pretilt angle.
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 solution effectively prevents the polymerization of reactive monomers, thereby enhancing the display quality of liquid crystal display panels by maintaining the pretilt angle and eliminating afterimages.
Implementation Method 1
a light conversion film layer disposed between the backlight layer and the liquid crystal layer and used to absorb ultraviolet light in the backlight
Implementation Method 2
Liquid crystals contain reactive monomers (RMs) which are subjected to a polymerization reaction under ultraviolet light (UV)
Data Source
AI summary
A liquid crystal display panel and a liquid crystal display device are provided. The liquid crystal display panel comprises a liquid crystal layer containing reactive monomers, a backlight layer disposed on a side of the liquid crystal layer and used to emit backlight to the liquid crystal layer, and a light conversion film layer disposed between the backlight layer and the liquid crystal layer and used to absorb ultraviolet light in the backlight. The present disclosure can improve the display quality of liquid crystal display panels by the above method.