Array Substrate Electrode Structure for Higher TFT-LCD Reflectivity
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Solution Overview
Problem
Current TFT-LCD display panels have low light efficiency, with only 3-10% of light from the backlight being effectively utilized, due to inadequate reflectivity in the array substrate's light-reflecting region.
Innovation Solution
The array substrate design includes a source/drain electrode with a three-layer conductive structure, where the second conductive layer made of aluminum has higher reflectivity than the first and third conductive layers, and is strategically positioned to enhance light reflectivity while maintaining electrical connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-layer conductive structure is used for source/drain electrode, then the manufacturing process is simple, but the light reflectivity is insufficient
Solution Approach 1:
The source/drain electrode is segmented into three distinct conductive layers (first, second, and third conductive layers) with different materials and reflectivity characteristics. This segmentation allows each layer to contribute differently to light reflection, with the second layer providing high reflectivity while the first and third layers provide lower reflectivity, collectively improving overall light efficiency without complicating the manufacturing process excessively
Solution Approach 2:
The patent employs composite material structure by combining multiple conductive layers with different optical properties. The first conductive layer has lower reflectivity, the second conductive layer has high reflectivity, and the third conductive layer has lower reflectivity. This composite structure optimizes light reflection by allowing light to pass through the first layer, reflect off the second layer, and be partially blocked by the third layer, thereby improving light efficiency while maintaining electrical functionality
2Reliability
If the first conductive layer has large orthographic projection region, then electrical connection is enhanced, but light interference increases
Solution Approach 1:
The patent applies local quality by making the first conductive layer's orthographic projection region smaller than that of the second conductive layer. This localized design allows the first layer to provide sufficient electrical connection at critical points while minimizing its overall footprint to reduce light interference. The second layer's larger projection region compensates by providing the primary light reflection function without being constrained by electrical connection requirements
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 significantly improves the reflectivity of the array substrate, enhancing the overall light efficiency of the TFT-LCD display panel by optimizing the reflectivity of the light-reflecting region without compromising electrical connections.
Implementation Method 1
a light reflectivity of the second conductive layer is greater than a light reflectivity of the first conductive layer, and the light reflectivity of the second conductive layer is greater than a light reflectivity of the third conductive layer
Data Source
AI summary
The present application discloses an array substrate, a manufacturing method for array substrate, a display panel, and a display device. The array substrate includes a first conductive layer close to an active layer, a third conductive layer disposed on a side of the first conductive layer away from the active layer, and a second conductive layer disposed between two conductive layers. A light reflectivity of the second conductive layer is greater than a light reflectivity of the first conductive layer and the third conductive layer, and an orthographic projection region of the first conductive layer on the substrate is less than an orthographic projection region of the second conductive layer on the substrate.