LCD Display Module Reflective Shielding for Higher Light Use
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Solution Overview
Problem
Conventional liquid crystal displays have low light efficiency due to the low utilization rate of light, with only 3 to 10% of light being utilized, primarily due to the influence of refractive index and light transmittance of film layers.
Innovation Solution
A display module design that includes a reflective light-shielding layer with a specific area ratio to a black matrix, incorporating first and second reflective light-shielding portions, and a thin film transistor layer to enhance light reflection and utilization, while ensuring the reflective light-shielding layer does not exceed the black matrix coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional light-shielding layer is used in liquid crystal display, then the structure is simple and easy to manufacture, but the light efficiency is low with only 3 to 10% light utilization
Solution Approach 1:
The light-shielding layer is segmented into a reflective light-shielding layer (first light-shielding layer) and a black matrix (second light-shielding layer). The reflective light-shielding layer has a high reflectivity (greater than 80%) and is positioned to reflect backlight light, while the black matrix provides additional shielding. This segmentation allows the patent to improve light utilization by reflecting otherwise wasted light while maintaining manufacturing feasibility through a layered structure that can be integrated into existing LCD processes.
2Loss of energy
If the reflective light-shielding layer area is increased to improve light utilization, then light efficiency improves, but the risk of reflection on display surface increases
Solution Approach 1:
The patent applies different properties to different regions: the reflective light-shielding layer has high reflectivity (greater than 80%) and is positioned in specific areas to reflect backlight, while the black matrix has high light absorption and is positioned to prevent reflection on the display surface. The front projection of the reflective light-shielding layer is disposed within the coverage of the black matrix, creating a hierarchical shielding structure that locally optimizes each layer's function to simultaneously improve light utilization and prevent harmful reflections.
Solution Approach 2:
The reflective light-shielding layer is nested within the coverage area of the black matrix. Specifically, the front projection of the reflective light-shielding layer corresponding to the display region is disposed within the coverage of the front projection of the black matrix. This nested arrangement ensures that any light reflected by the reflective layer is further managed by the black matrix, preventing unwanted reflections on the display surface while maintaining the light-utilizing benefits of the reflective layer.
3Loss of energy
If more light-shielding materials are used to improve light efficiency, then light utilization improves, but the device complexity increases
Solution Approach 1:
The reflective light-shielding layer serves multiple functions: it shields light from reaching the substrate (traditional light-shielding function), reflects backlight light to improve utilization efficiency, and when nested within the black matrix coverage, prevents harmful reflections. This multi-functionality allows the patent to improve light efficiency without proportionally increasing device complexity, as the same layer structure achieves shielding, reflection, and reflection prevention simultaneously.
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
Improves light efficiency by increasing the utilization rate of backlight light, reducing power consumption, and maintaining display quality by preventing reflection on the display surface.
Implementation Method 1
a reflective light-shielding layer disposed on the substrate... improve the light efficiency of the display module by improving the utilization ratio of the display module for the light from the backlight assembly
Implementation Method 2
a black matrix disposed on a side of the thin film transistor layer away from the reflective light-shielding layer... preventing the reflective light-shielding layer from causing reflection on the display surface side
Data Source
AI summary
The disclosure provides a display module and a display device. A front projection of a reflective light-shielding layer on a substrate and corresponding a display region is located within a coverage of a front projection of a black matrix on the substrate and corresponding to the display region, and a ratio of a front projection area of the reflective light-shielding layer on the substrate and corresponding to the display region to a front projection area of the black matrix on the substrate and corresponding to the display region is greater than 20%.