Array Substrate Light Leakage Reduction via Integrated Photosensor
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Solution Overview
Problem
Conventional LCDs using amorphous silicon TFTs suffer from light leakage issues due to electron-hole pair generation when exposed to light, leading to potential instability and suboptimal image quality.
Innovation Solution
The array substrate design incorporates a switch assembly with a first metal layer and a first electrode layer on the same layer, where the first electrode layer is used to form a photosensor, blocking light and reducing leakage while also serving as a lower electrode, and a color photoresist layer is used in conjunction with the photosensor to adjust brightness based on ambient light conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If amorphous silicon TFT is used in conventional LCD, then manufacturing simplicity is maintained, but light leakage occurs due to electron-hole pair generation when exposed to light
Solution Approach 1:
The patent converts the harmful light exposure that causes electron-hole pair generation into a beneficial photosensing function. The switch assembly's amorphous silicon layer, which previously caused light leakage, is now utilized as a photosensor to detect ambient light and automatically adjust display brightness, turning the defect into a useful feature for energy saving and user comfort.
Solution Approach 2:
The switch assembly is given multiple functions: it continues to serve as the pixel switch for controlling liquid crystal while simultaneously functioning as a photosensor for ambient light detection. This multi-functionality eliminates the need for separate photosensing components and resolves the light leakage issue by leveraging the existing amorphous silicon structure.
2Adaptability or versatility
If separate photosensing components are added to detect ambient light, then brightness adjustment capability is improved, but device complexity increases
Solution Approach 1:
The switch assembly performs dual functions as both the pixel switching element and the photosensor. By utilizing the existing amorphous silicon layer in the switch assembly for photosensing, the patent avoids adding separate photosensing components, thereby maintaining device simplicity while achieving ambient light detection and automatic brightness adjustment.
Solution Approach 2:
The patent merges the photosensing function with the switch assembly structure. The amorphous silicon layer that forms the basis of the switch is also used as the photosensitive element, combining two previously separate functions into a single integrated component, thus reducing overall device complexity.
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 design effectively reduces light leakage, improves production efficiency and product quality, and enables automatic brightness adjustment to enhance display image clarity and user comfort by utilizing the same metal layer for both light blocking and photosensing purposes.
Implementation Method 1
the first electrode layer is used to form a photosensor, blocking light and reducing leakage
Implementation Method 2
a color photoresist layer is used in conjunction with the photosensor to adjust brightness based on ambient light conditions
Data Source
AI summary
The present disclosure provides an array substrate and a method for manufacturing an array substrate. The array substrate includes a substrate, a switch assembly disposed on the substrate and correspondingly disposed beside the switch assembly, a color photoresist layer formed on the switch assembly and the photosensor, and a pixel electrode formed on the color photoresist layers and coupled with the switch assembly. The switch assembly includes a first metal layer. The photosensor includes a first electrode layer formed directly on the substrate and a first amorphous silicon layer disposed above the first electrode layer. The first electrode layer and the first metal layer are disposed on a same layer.