Pixel Circuit Dual-Gate Transistor Source Potential Compensation
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Solution Overview
Problem
The time available for compensating the source potential of the driving transistor in each frame is too short, making it difficult for the source potential to reach a preset potential, which affects the compensation effect.
Innovation Solution
A pixel circuit is designed with a dual-gate dual-channel type thin film transistor configuration for the first, second, and driving transistors, along with a storage capacitor and a light emitting device, to improve mobility and extend the compensation time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the display panel size increases and/or refresh frequency increases, then the display performance is improved, but the compensation time for the driving transistor source potential is shortened
Solution Approach 1:
The patent introduces an initialization stage before the compensation stage, where the initialization transistor pre-charges the source potential of the driving transistor to a preset potential. This preliminary action ensures that when the compensation stage begins, the source potential is already at the required level, allowing sufficient compensation time even with increased refresh frequencies or larger display panel sizes.
2Speed
If the display panel size increases and/or refresh frequency increases, then the display performance is improved, but the time for the source potential to reach preset potential is shortened
Solution Approach 1:
The initialization transistor is activated in advance during the initialization stage to pre-charge the source potential of the driving transistor to a preset potential. This ensures that when the compensation stage starts, the source potential is already at the required level, eliminating the need for time-consuming charging during the compensation stage and allowing sufficient time for compensation even with increased refresh frequencies or larger display panel sizes.
Solution Approach 2:
The patent dynamically controls the switching of the initialization transistor and driving transistor through different control signals. The initialization transistor is turned on during the initialization stage to charge the source potential, then turned off. The driving transistor is turned on during the compensation stage to perform compensation. This dynamic switching optimizes the timing and speed of source potential charging at different stages.
Data Source
AI summary
The present disclosure discloses a pixel circuit and a display panel. The pixel circuit includes a driving transistor, a storage capacitor, a first transistor, and a second transistor. By configuring the first transistor as a dual-gate dual-channel type thin film transistor, so that when a source of the driving transistor is compensated through the first transistor and the storage capacitor by a data signal, a source potential of the driving transistor may be quickly increased to a preset potential in a short time.