Flexible Pixel Structure with Redundant TFT Groups
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Flexible electronic paper with a pixel structure featuring two TFTs connected in series is prone to damage under stress, such as bending, leading to signal disruption and poor display due to the lack of flexibility in the semiconductor layer, causing the entire pixel to malfunction when the channel area in one TFT is broken.
Innovation Solution
The pixel structure is redesigned with two groups of TFTs connected in series, each group comprising at least two TFTs, where the source electrodes of one group are connected to a data line, and the drain electrodes of the other group are connected to the pixel electrode, ensuring that even if one TFT's channel area is broken, the other TFTs in the group can maintain normal operation and continue signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If two TFTs are connected in series in the pixel structure, then the voltage holding capability is improved, but the reliability deteriorates because the semiconductor layer lacks flexibility and is prone to damage under bending stress
Solution Approach 1:
The pixel structure is segmented into multiple independent TFT groups (first group with TFT11-TFT1m, second group with TFT21-TFT2n) instead of a single series connection. Each group can independently transmit signals, so if one TFT's channel is damaged, other TFTs in the same or opposite group can compensate and maintain normal operation.
Solution Approach 2:
The patent changes the structural parameter from a simple series connection of two TFTs to a dual-group parallel-series configuration. This parameter change increases the system's redundancy and flexibility, allowing the pixel structure to maintain functionality even when individual TFT channels are damaged due to bending stress.
2Manufacturing precision
If the semiconductor layer is made rigid to ensure TFT functionality, then the manufacturing precision is improved, but the adaptability deteriorates because the structure cannot withstand bending stress
Solution Approach 1:
By dividing the pixel structure into multiple TFT groups with independent signal transmission paths, the system can tolerate channel damage in one TFT without affecting overall functionality. This segmentation provides adaptability to bending stress while maintaining manufacturing precision for each individual TFT channel.
Solution Approach 2:
The dual-group TFT configuration provides a backup signal transmission path before damage occurs. When bending stress damages one TFT's channel, the other group is already in place to compensate and maintain normal operation, cushioning against the harmful effect of channel breakage.
3Duration of action of stationary object
If more TFTs are added to improve voltage holding, then the duration of action is improved, but the device complexity increases
Solution Approach 1:
The pixel structure uses two groups of TFTs (first group: TFT11-TFT1m, second group: TFT21-TFT2n) where each group contains multiple TFTs. This segmentation allows the system to achieve prolonged voltage holding through the combined effect of multiple TFTs while maintaining manageable complexity through systematic arrangement and shared control lines.
Solution Approach 2:
The gate lines (first gate line and second gate line) serve multiple TFTs simultaneously, providing universal control. This multi-functionality allows the pixel structure to achieve extended voltage holding duration through multiple TFTs without proportionally increasing control complexity, as single gate lines can control multiple TFT gates.
Data Source
AI summary
Provided are a pixel structure, an array substrate and a display device. The pixel structure includes a first group of TFTs, a second group of TFTs and a pixel electrode. First group of TFTs and second group of TFTs each include at least two TFTs. Source electrodes of all TFTs in first group of TFTs are connected to a same data line, drain electrodes of all TFTs in first group of TFTs are connected to sources electrodes of all TFTs in second group of TFTs, drain electrodes of all TFTs in second group of TFTs are connected to pixel electrode, and gate electrodes of all TFTs in first group of TFTs and gate electrodes of all TFTs in second group of TFTs are connected to a same gate line. A problem that whole pixel cannot work normally caused by the breakage of area where the channel is formed is avoided.