Color Filter Substrate Blue Light Transmittance
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Solution Overview
Problem
Liquid Crystal Display (LCD) devices exhibit lower blue light transmittance compared to red and green, resulting in a yellowish display screen due to larger color mixing brightness differences, which affects display quality.
Innovation Solution
A color filter substrate with a black matrix and a color resist layer comprising different light transmittance resist materials, where the third color resist has lower transmittance than the first and second resist materials, arranged to reduce parasitic capacitance and enhance electric field deflection, improving light transmittance and color accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the blue pixel unit uses the same color resist material as red and green pixel units, then the manufacturing process is simplified, but the light transmittance of blue pixel units is lower causing yellowish display screen
Solution Approach 1:
The patent applies local quality by using different color resist materials with distinct light transmittance characteristics for different pixel types. Specifically, the blue pixel unit employs a third color resist material with lower light transmittance compared to the first and second color resist materials used in red and green pixel units. This localized material differentiation allows each pixel type to have optimized optical properties, thereby improving blue light transmittance and preventing yellowish display while maintaining overall manufacturing feasibility through a systematic approach.
2Manufacturing precision
If the third color resist material has lower light transmittance, then the color accuracy is improved, but the light transmittance difference between regions increases
Solution Approach 1:
The patent utilizes parameter changes by systematically varying the light transmittance parameter of the color resist materials across different pixel regions. The third color resist material in blue pixel units has a specifically controlled lower light transmittance parameter compared to other pixel types. This parameter differentiation enables precise color reproduction and accuracy while the overall design ensures that light transmittance differences between regions remain manageable, achieving a balance between color accuracy and display uniformity.
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 increases the charging rate of liquid crystal molecules, reduces light transmittance differences between regions, and improves display quality by minimizing color offset and enhancing the overall display performance.
Implementation Method 1
When a voltage is applied to the field generating electrode to generate an electric field in the liquid crystal layer, liquid crystal molecules are deflected under the action of the electric field
Implementation Method 2
liquid crystal molecules are deflected under the action of the electric field, thus controlling the transmission of light
Data Source
AI summary
A color filter substrate includes: a base substrate; a black matrix arranged on a surface of the base substrate and defining a plurality of first light-transmitting regions a plurality of second light-transmitting regions and a plurality of third light-transmitting regions on the base substrate; a color resist layer including a first color resist, a second color resist and a third color resist arranged in the first light-transmitting regions, the second light-transmitting regions and the third light-transmitting regions respectively, the first color resist covering the black matrix between two adjacent first light-transmitting regions, and the second color resist covering the black matrix between two adjacent second light-transmitting regions; and a common electrode layer.