Display Substrate Layout Using Oxide and Poly-Si TFTs
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Solution Overview
Problem
Existing display devices face challenges in achieving lower power consumption and larger area designs, as current technologies struggle to optimize thin-film transistor configurations for efficient power management and increased aperture ratios.
Innovation Solution
A substrate for display devices is designed with a first thin-film transistor featuring an oxide semiconductor layer and a second thin-film transistor with a polycrystalline semiconductor layer, along with a storage capacitor, where electrodes are formed from the same materials as the gate and source/drain electrodes, respectively, to reduce power consumption and increase the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional thin-film transistor configurations are used, then manufacturing processes are simpler, but power consumption is higher and aperture ratios are lower
Solution Approach 1:
The pixel electrode is divided into multiple segments (first pixel electrode and second pixel electrode) that are positioned at different heights. This segmentation allows each electrode segment to be controlled by separate transistors, enabling independent optimization of switching and driving functions, which reduces overall power consumption while managing device complexity
Solution Approach 2:
The patent introduces a vertical dimension by positioning electrode segments at different heights (first height and second height). This three-dimensional arrangement allows multiple functional layers to coexist without lateral interference, enabling lower power consumption through optimized current paths while maintaining manageable device complexity
2Area of stationary object
If larger aperture ratios are achieved, then display area increases, but manufacturing precision requirements increase
Solution Approach 1:
By transitioning to a three-dimensional electrode arrangement with segments at different heights, the patent achieves larger effective aperture ratios without requiring extremely precise lateral alignment. The vertical separation provides manufacturing tolerance, as electrodes at different heights can be positioned with relaxed lateral precision while still achieving large overlapping areas
Solution Approach 2:
The segmented electrode structure allows the aperture area to be distributed across multiple electrode segments rather than requiring a single large precisely-aligned electrode. This segmentation enables the total aperture ratio to increase while each individual segment maintains manageable manufacturing precision requirements
Data Source
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AI summary
A substrate for a display device and a display device including the same are disclosed. The substrate includes a first thin-film transistor including an oxide semiconductor layer, a second thin-film transistor spaced apart from the first thin-film transistor and including a polycrystalline semiconductor layer, and a storage capacitor including at least two storage electrodes. One of the at least two storage electrodes is located in the same plane and is formed of the same material as gate electrodes of the first thin-film transistor and the second thin-film transistor, and another one of the at least two storage electrodes is located in the same plane and is formed of the same material as source and drain electrodes of the first thin-film transistor and the second thin-film transistor. Accordingly, lower power consumption and a larger area of the substrate are realized.