Chromaticity Compensation Layer for Display Backlight Yellowing
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Solution Overview
Problem
Recent passive display modules, particularly those with light guide panels manufactured using injection molding, experience significant yellowing issues away from the light incident area, affecting product quality due to material discoloration during manufacturing.
Innovation Solution
Incorporating a chromaticity compensation layer, comprising blue pigments such as phthalocyanine, dioxazine, cyan, violet, and magenta pigments, between the light guide panel and the reflection sheet, or within the light guide panel itself, to counteract the yellowing effect by adjusting color components of the light beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a light guide panel is manufactured using injection molding method, then productivity is improved, but yellowing of image color occurs away from light incident area
Solution Approach 1:
The patent applies color compensation by selecting specific materials for the light guide panel and reflection sheet that have complementary color properties. The light guide panel material and reflection sheet material are chosen to compensate for each other's color characteristics, thereby reducing the yellowing effect in the final display without changing the manufacturing process.
Solution Approach 2:
The patent uses composite material selection where the light guide panel and reflection sheet are made from materials with specific color compensation properties. By combining materials with complementary color characteristics, the overall yellowing effect is reduced while maintaining the injection molding manufacturing method.
2Adaptability or versatility
If light guide panel thickness is reduced to meet thinner display trends, then adaptability is improved, but yellowing becomes more severe
Solution Approach 1:
The patent compensates for the increased yellowing in thinner light guide panels by selecting materials with specific color compensation properties. The color characteristics of the light guide panel and reflection sheet materials are carefully chosen to offset the yellowing that occurs when the panel thickness is reduced.
Solution Approach 2:
The patent adjusts material selection parameters based on the light guide panel thickness. For thinner panels where yellowing is more severe, materials with stronger color compensation properties are selected to maintain color uniformity across the display.
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 chromaticity compensation layer effectively reduces yellowing by up to 74% compared to systems without such compensation, improving color uniformity and minimizing color variations across the display module.
Implementation Method 1
at least one color component of the light beams would be disproportionately absorbed while light beams are traveling in the horizontal direction... the chromaticity compensation layer... to counteract the yellowing effect by adjusting color components of the light beams
Data Source
AI summary
A display module includes a display panel configured to display an image and a backlight. The backlight includes a light guide panel configured to guide light to the display panel, a light source element configured to supply light to the light guide panel, and a reflection sheet disposed over the light guide panel, wherein a chromaticity compensation layer is formed in the backlight unit. The chromaticity compensation layer formed in the backlight reduces yellowing.