Color Filter Substrate with Refractive Index Layers for Cross-Color Control
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Solution Overview
Problem
Display panels, such as liquid crystal display panels, face challenges in maintaining high transmittance while avoiding cross-color issues due to the reduction in pixel size and black matrix width, leading to increased power consumption and heat generation when trying to enhance brightness.
Innovation Solution
A color filter substrate with a high refractive transparent layer between color filter films of different colors and a low refractive transparent layer between those of the same color, both with refractive indices higher and lower than the intermediate medium, respectively, are used to reduce cross-color occurrence and improve transmittance by controlling light refraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the black matrix width is reduced to maintain high transmittance, then transmittance is improved, but cross-color occurs between adjacent pixels
Solution Approach 1:
The patent applies local quality by creating different refractive index regions at specific locations around the black matrix. High refractive index transparent layers are formed only between color filter films of different colors, while low refractive index transparent layers are formed between color filter films of the same color. This localized differentiation allows the structure to prevent cross-color where needed while maintaining transmittance where possible.
Solution Approach 2:
The patent changes the refractive index parameter of transparent layers to control light propagation. By forming transparent layers with refractive indices higher or lower than the intermediate medium, the patent alters the light refraction behavior at the black matrix boundaries. This parameter change enables the black matrix to effectively block oblique light without requiring increased width, thus preventing cross-color while maintaining high transmittance.
2Object-affected harmful factors
If the black matrix width is increased to prevent cross-color, then cross-color is avoided, but transmittance is lowered
Solution Approach 1:
Instead of uniformly increasing the black matrix width, the patent applies local quality by forming refractive index control layers only at specific positions where cross-color prevention is needed. The high refractive index transparent layers are placed between color filter films of different colors, while low refractive index transparent layers are placed between color filter films of the same color, allowing selective cross-color prevention without overall width increase.
Solution Approach 2:
The patent introduces transparent layers with controlled refractive indices as intermediary structures between the black matrix and color filter films. These intermediary layers modify light propagation paths through refraction, enabling the black matrix to prevent cross-color more effectively without requiring increased width. The intermediaries facilitate the function of cross-color prevention while preserving transmittance.
3Illumination intensity
If the brightness of the backlight source is increased to maintain displaying brightness, then display brightness is maintained, but power consumption increases
Solution Approach 1:
The patent changes the optical parameters of the color filter substrate by introducing transparent layers with specific refractive indices. This parameter change improves light transmission efficiency through the display panel, allowing high display brightness to be achieved with lower backlight intensity, thus reducing power consumption.
Solution Approach 2:
The patent replaces the mechanical approach of increasing black matrix width (physical structure change) with an optical approach using refractive index control layers. This substitution allows for more efficient light management that reduces the need for high backlight power while maintaining display brightness.
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 the likelihood of cross-coloring and allows for a narrower black matrix width, enhancing transmittance and aperture ratio while maintaining display brightness without increasing power consumption.
Implementation Method 1
a high refractive transparent layer disposed on a side of the black matrix between the color filter films having different colors away from the substrate, the high refractive transparent layer having a refractive index higher than that of a intermediate medium
Implementation Method 2
a low refractive transparent layer disposed on a side of the black matrix between the color filter films having the same color away from the substrate, and the low refractive transparent layer has a refractive index lower than that of the intermediate medium
Data Source
AI summary
The color filter substrate includes a substrate, a plurality of spaced color filter films disposed on the substrate, a black matrix disposed between adjacent color filter films, and a high refractive transparent layer disposed on a side of the black matrix between the color filter films having different colors away from the substrate, the high refractive transparent layer having a refractive index higher than that of a intermediate medium, and the intermediate medium is a medium filled in a display panel comprising va color filter substrate and a counter substrate. The present disclosure is capable of at least partially solving a problem that the color film substrate cannot simultaneously satisfy the requirements of avoiding cross color and increasing transmittance.