Display Panel Light-Obstructing Layer Reduces Leakage Current
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Solution Overview
Problem
The existing display panels face a challenge with high light exposure leakage current due to the semiconductor layer's high optical electroconductive coefficient, which affects display quality and competitiveness, especially under strong backlight illumination.
Innovation Solution
A display panel design featuring a light-obstructing layer composed of a first metal layer and semi-transparent layers that entirely cover the semiconductor layer, reducing backlight illumination and leakage current, while also improving manufacturing efficiency and cost-effectiveness by using the same mask for both layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the semiconductor layer is exposed to backlight illumination to enable display function, then the display can operate, but light exposure leakage current increases reducing display quality
Solution Approach 1:
A light-obstructing layer is introduced as an intermediary between the backlight module and the semiconductor layer. This layer selectively blocks light from reaching the semiconductor layer while allowing the display to function, thereby reducing light exposure leakage current without compromising display operation
Solution Approach 2:
The harmful light exposure effect is extracted and removed from the system by placing the light-obstructing layer, which blocks the light path to the semiconductor layer, separating the illumination function from the semiconductor layer to prevent leakage current generation
2Reliability
If a light-obstructing layer is added to reduce leakage current, then display quality improves, but device complexity increases
Solution Approach 1:
The light-obstructing layer is merged with the existing color filter layer structure, combining light-blocking functionality with the color filter's optical properties. This integration reduces the need for separate additional layers and simplifies the overall device structure while maintaining effectiveness in reducing leakage current
3Reliability
If additional layers are added to obstruct light, then leakage current is reduced, but manufacturing cost and process complexity increase
Solution Approach 1:
The formation of the light-obstructing layer is merged with the existing color filter manufacturing process, using the same photolithography and etching steps. This integration eliminates the need for additional masking and etching processes, thereby reducing manufacturing complexity and cost while achieving effective light obstruction
Solution Approach 2:
The color filter layer is given multiple functions: it serves both its traditional color filtering role and acts as the light-obstructing layer to block light from the semiconductor layer. This multi-functionality eliminates the need for a separate dedicated light-blocking layer, simplifying manufacturing
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 configuration effectively reduces light exposure leakage current, enhancing display quality and competitiveness by obstructing backlight illumination and stabilizing the display panel's performance, with adjustable light-obstructing layer coverage to suit different panels.
Implementation Method 1
the semi-transparent layers entirely covering the semiconductor layer can make the semi-transparent layers effectively obstruct the backlight very well
Implementation Method 2
the semi-transparent layers entirely covering the semiconductor layer can make the semi-transparent layers effectively obstruct the backlight very well
Data Source
AI summary
A display panel includes a substrate and active switches disposed on the substrate. A light-obstructing layer is disposed between the active switches and the substrate. Each of the active switches includes a semiconductor layer. The light-obstructing layer entirely covers the semiconductor layer.