Color Filter Substrate with Photoluminescent Layer and Prism Films
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Solution Overview
Problem
Liquid crystal displays face challenges in achieving a better color gamut and increased brightness, with existing technologies limiting their ability to provide vibrant and efficient color representation.
Innovation Solution
A color filter substrate is designed with a photoluminescent layer and brightness enhancement structure, including prism films, to enhance light reflection and refraction, incorporating photoluminescent materials like quantum dots and quantum rods, which improve color purity and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a color filter layer is used to convert white light into monochromatic lights, then colorful display is achieved, but color gamut and brightness are limited
Solution Approach 1:
The patent combines quantum dots (photoluminescent material) with color filter layers to create a composite structure. The quantum dots emit pure monochromatic light when excited by blue light, and the color filter layer selectively transmits specific wavelengths. This composite approach achieves both high brightness and wide color gamut by leveraging the complementary properties of the two materials.
Solution Approach 2:
The patent changes the optical parameters of the display system by introducing photoluminescent material with specific emission characteristics. The quantum dots are designed to emit light at specific wavelengths (e.g., 530nm for green, 630nm for red) when excited by blue light (480nm), thereby changing the spectral output parameters to achieve wider color gamut and higher brightness simultaneously.
2Manufacturing precision
If conventional color filter structures are used, then manufacturing is simple, but light reflection and color purity are insufficient
Solution Approach 1:
The patent introduces an intermediary layer - the photoluminescent layer - between the blue light source and the color filter layer. This intermediary converts the blue light into pure monochromatic light through photoluminescence, thereby improving color purity. The intermediary layer simplifies the overall structure by replacing complex multi-layer color filter systems with a simpler quantum dot-based approach.
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 increases the color gamut and brightness of the display by optimizing light emission and reflection, using photoluminescent materials and prism films to enhance light output and color accuracy.
Implementation Method 1
a photoluminescent layer arranged at a side of the color filter layer away from the base plate
Implementation Method 2
the first prism film is used to reflect an incident light from the photoluminescent layer back to the photoluminescent layer
Implementation Method 3
the second prism film is used to refract an incident light from a side of the second prism film away from the color filter layer to the color filter layer
Data Source
AI summary
A color filter substrate, a display panel and a display device are provided. The color filter substrate includes a base plate and a color filter layer formed on the base plate, a photoluminescent layer arranged at a side of the color filter layer away from the base plate, and a brightness enhancement structure arranged at the side of the color filter layer away from the base plate. In the color filter substrate, by arranging the photoluminescent layer and the brightness enhancement structure at the side of the color filter layer away from the base plate, the color filter substrate has a better color gamut and the brightness at a light-outgoing side is increased.