Dual-Gate TFT Discharge Method for Pixel Deterioration Compensation
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Solution Overview
Problem
Conventional discharge methods for thin-film-transistors (TFTs) in organic light emitting displays apply uniform operating voltages, leading to over or under discharge, which deteriorates display quality and fails to effectively recover the TFT channel, resulting in poor image quality.
Innovation Solution
A dual-gate TFT structure with independent bottom-gate and top-gate is used, allowing for different operating voltages to be applied to each pixel, enabling tailored discharge effects by forming specific electric fields between the gates and the source/drain, thereby adjusting the current flowing through the TFT to compensate for pixel deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If uniform operating voltage is applied to each TFT during discharge process, then the discharge process can be simplified, but the TFT would be either over discharged or under discharged leading to deteriorated display quality
Solution Approach 1:
The patent divides the gate control into two independent gates (first gate and second gate) that can be controlled separately. This segmentation allows different voltages to be applied to each gate, enabling precise control of discharge current for each pixel while maintaining manageable complexity through modular voltage application.
Solution Approach 2:
The patent implements local quality control by allowing different voltage levels to be applied to the first gate and second gate independently. This enables each pixel's TFT to receive customized discharge voltage based on its specific deterioration level, preventing both over-discharge and under-discharge while maintaining overall system manageability.
2Productivity
If conventional discharge method is used, then the discharge process can be completed, but the channel within the TFT cannot be effectively recovered
Solution Approach 1:
The patent changes the voltage parameters by applying different voltages to the first gate and second gate independently. By adjusting the voltage difference between the two gates, the discharge current magnitude can be precisely controlled to achieve complete channel recovery without causing over-discharge, thereby improving TFT reliability while maintaining discharge efficiency.
3Manufacturing precision
If different operating voltages are applied according to pixel deterioration, then display quality can be improved, but the discharge process becomes more complex
Solution Approach 1:
The patent uses segmentation by dividing gate control into two independent gates that can be controlled separately. This allows different voltage levels to be applied to each gate based on pixel deterioration levels, achieving precise display quality control while managing complexity through modular voltage application strategies.
Solution Approach 2:
The patent implements dynamic control by allowing the voltage levels on the first gate and second gate to be adjusted independently based on real-time pixel deterioration conditions. This dynamic voltage adjustment enables optimized discharge for each pixel while maintaining overall system manageability through coordinated gate control.
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 approach enhances display quality by allowing for customized discharge based on pixel deterioration, reducing the influence of TFT degradation and improving image quality by adjusting the current flowing through the TFT.
Implementation Method 1
A first voltage and a second voltage are respectively provided to the first gate and the second gate of the TFT, so that the first voltage difference between the first voltage and the second voltage controls the magnitude of the current flowing through the TFT
Implementation Method 2
A third voltage, a fourth voltage, and a fifth voltage are respectively provided to the second gate of the TFT, the source/drain of TFT and another terminal of the electroluminescent element, so that the second voltage difference between the third voltage and the first voltage, the fourth voltage, and the fifth voltage enable discharge of the TFT
Data Source
AI summary
A display and the thin-film-transistor discharge method therefore are used for providing a dual-gate thin film transistor to drive the electroluminescent element to emit light. While the thin film transistor (TFT) is discharged, an electric field is formed between the top-gate and the bottom-gate. The electric field is for improving the electric discharge effect at the channel of the TFT, and the magnitude of the applied electric field corresponds to the magnitude of the pixel voltage.