Display Panel Polarizing Films Eliminate Black Matrix Light Leakage
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Solution Overview
Problem
Conventional liquid crystal display (LCD) panels experience issues with red reflection lines and light leakage due to differences in material compositions of black matrices in transparent cover plates and color filter films, which are exacerbated by polarizers.
Innovation Solution
The use of two polarizing films with perpendicular polarization axes, one on each side of a color filter film, to create a light-blocking region without the need for a black matrix, where the first polarizing film has a first region corresponding to the color filter region and a second region with a polarizing axis perpendicular to the second polarizing film's axis, which is formed using polyimide doped with dichroic organic dyes and irradiated with polarized ultraviolet light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If black matrices are used in transparent cover plates and color filter films, then light blocking function is provided, but reflection rate differences cause red reflection lines and display quality issues
Solution Approach 1:
The invention extracts and removes the black matrix component from the display structure. Instead of using black matrices in both the transparent cover plate and color filter film, the patent eliminates these traditional light-blocking structures and replaces them with a liquid crystal layer configured to provide light blocking function, thereby eliminating the reflection rate difference problem while maintaining light blocking effectiveness.
Solution Approach 2:
The invention changes the optical parameters of the light blocking mechanism by transitioning from absorption-based black matrices to polarization-based liquid crystal light blocking. By utilizing the polarization properties of liquid crystal molecules and applying voltage control, the system achieves light blocking through parameter changes in molecular orientation rather than material composition changes, eliminating reflection issues.
2Ease of operation
If polarizers are added to control light polarization, then display functionality is enhanced, but reflection rate differences are amplified
Solution Approach 1:
The invention merges the light control function and light blocking function into a single integrated liquid crystal layer system. By combining the polarization control capability with the light blocking function in the same layer, the patent eliminates the need for separate black matrices and reduces the number of interfaces where reflection rate differences could occur, thereby enhancing light control while reducing reflection problems.
3Adaptability or versatility
If multiple layers with different material compositions are used, then functional requirements are met, but manufacturing complexity increases
Solution Approach 1:
The invention makes the liquid crystal layer universal by assigning it multiple functions: light modulation, light blocking, and polarization control. This multi-functional design eliminates the need for separate black matrix layers and reduces material composition differences across multiple components, simplifying the overall structure while maintaining all necessary display functions.
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 configuration effectively blocks light in the light-blocking regions, eliminating the need for black matrices and reducing light leakage, thereby improving display panel performance by ensuring uniform light transmission and reducing reflection issues.
Implementation Method 1
polyimide doped with dichroic organic dyes and irradiated with polarized ultraviolet light
Implementation Method 2
a polarization axis of the second region of the second polarizing film and a polarization axis of the second region of the first polarizing film are perpendicular to each other
Implementation Method 3
By changing the voltage applied to the liquid crystal and thus changing the rotation angle of the liquid crystal molecules, the rotation direction and the polarization state of a polarized light may be controlled
Data Source
AI summary
A display panel includes a color filter film, a first polarizing film, and a second polarizing film. The color filter film comprises a color filter region and a light blocking region. The first polarizing film, placed at one side of the color filter film, comprises a first region corresponding to the color filter region of the color filter film and a second region corresponding to the light blocking region of the color filter film. The second polarizing film, placed at the one side of the color filter film, comprises a first region corresponding to the color filter region of the color filter film and a second region corresponding to the light blocking region of the color filter film, wherein a polarization axis of the second region of the second polarizing film and a polarization axis of the second region of the first polarizing film are perpendicular to each other.