LTPO Display Panel Electrode Layout for Thinner Flexible Stacks
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Solution Overview
Problem
Display panels using low temperature polycrystalline oxide (LTPO) technology have a complex production process and reduced bending ability due to their multi-layered film structure and increased thickness.
Innovation Solution
A display panel design with a thin film transistor array layer featuring polysilicon and oxide semiconductor layers, where the storage capacitor is formed by a first polar plate and a second gate electrode in the same layer, reducing the number of film layers and thickness, and using a silicon nitride and silicon oxide interlayer insulation layer with a specific atomic percentage of silicon-hydrogen bonds to improve stability and simplify the production process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If LTPO technology is used with separate gate electrodes for driving and switching TFTs, then power consumption is reduced and response speed is improved, but the number of film layers increases and thickness increases
Solution Approach 1:
The patent merges the gate electrode of the driving TFT and the first polar plate of the storage capacitor into a single integrated structure. This combining reduces the number of separate film layers while maintaining the functional separation needed for low power consumption and fast response characteristics of LTPO technology
Solution Approach 2:
The integrated gate electrode structure serves multiple functions: it acts as the gate electrode for the driving TFT and simultaneously serves as the first polar plate for the storage capacitor. This multi-functionality reduces the overall number of layers without compromising the performance benefits of having separate driving and switching TFTs
2Speed
If LTPO technology is used with separate gate electrodes for driving and switching TFTs, then power consumption is reduced and response speed is improved, but the thickness of film laminated structure increases
Solution Approach 1:
By integrating the driving TFT gate electrode with the storage capacitor first polar plate into a single layer, the patent reduces the cumulative thickness of the film laminated structure while preserving the fast response characteristics enabled by separate driving and switching TFTs with different semiconductor materials
3Reliability
If multiple gate insulation layers are used to separate gate electrodes, then electrical isolation is improved, but the production process complexity increases
Solution Approach 1:
The patent combines the functions of the driving TFT gate electrode and storage capacitor first polar plate into a single integrated structure, which naturally provides electrical isolation through the semiconductor layer and insulating layers already present in the structure, thereby reducing the need for additional dedicated gate insulation layers and simplifying the manufacturing process
Data Source
AI summary
The present invention provides a display panel and a display device. A first gate electrode and a first polar plate of a first thin film transistor are used to constitute a storage capacitor. At a same time, the first polar plate and a second gate electrode of a second thin film transistor are disposed in a same layer. Therefore, a gate insulation layer used to separate the first polar plate from the first gate electrode and the second gate electrode in layers can be omitted, so as to reduce a number of film layers in the display panel and a thickness of a film laminated structure, thereby reducing a complexity of a process flow of the display panel, and improving bending ability of the display panel.