Pixel Driving Circuit Bias Unit for OLED Flickering
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Solution Overview
Problem
Organic light-emitting display devices experience flickering due to the influence of last frame data on driving transistors, leading to slow frame switching and poor display effects.
Innovation Solution
A pixel driving circuit with a bias unit connected between the third node and the output terminal of the light-emitting control circuit, which adjusts the bias state of the driving transistor using a control signal to mitigate the impact of last frame data, ensuring quick frame switching and improved display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the driving transistor is used to generate driving current without bias adjustment, then the circuit structure is simple, but the display screen cannot quickly switch to the preset frame causing flickering
Solution Approach 1:
The bias unit adjusts the bias state of the driving transistor before the light-emitting stage to ensure that the transistor is in the optimal working state for quick frame switching. This preliminary adjustment prevents the transistor from being affected by last frame data, enabling fast transition to the preset frame without adding complex circuit structures.
Solution Approach 2:
The bias unit acts as an intermediary component between the light-emitting control circuit and the driving transistor. It receives control signals from the light-emitting control circuit and uses them to adjust the bias state of the driving transistor, thereby mediating the interaction between the control circuit and the transistor to achieve quick frame switching.
2Reliability
If the driving transistor is affected by last frame data, then the circuit operation is continuous, but obvious flickering phenomenon occurs affecting display effect
Solution Approach 1:
The bias unit applies a preliminary counter-action by adjusting the bias state of the driving transistor before the light-emitting stage. This counter-action offsets the influence of last frame data on the transistor, preventing flickering phenomena and ensuring reliable display effect while maintaining efficient frame switching.
Solution Approach 2:
The bias unit receives control signals from the light-emitting control circuit and uses them to adjust the bias state of the driving transistor. This feedback mechanism ensures that the transistor is in the optimal working state for each frame, eliminating flickering caused by residual effects from previous frames while maintaining high frame switching efficiency.
3Stability of the object's composition
If no bias adjustment is applied, then the device structure is simple, but the threshold voltage of driving transistor varies causing flickering
Solution Approach 1:
The bias unit adjusts the bias state of the driving transistor before the light-emitting stage to ensure stable threshold voltage. This preliminary adjustment stabilizes the transistor's working state, preventing flickering caused by voltage variations while adding minimal circuit complexity.
Data Source
AI summary
A pixel driving circuit, a display panel and a driving method are provided. The pixel driving circuit includes: a first power signal terminal receiving a first voltage signal and a second power signal terminal receiving a second voltage signal; a driving transistor configured to provide a driving current in a light-emitting stage; a light-emitting component, connected in series between the driving transistor and the second power signal terminal and configured to emit light in response to the driving current; a light-emitting controller connected in series between the first power signal terminal and the light-emitting component; and a bias unit, electrically connected between the third node and a second output terminal of a light-emitting control circuit, and in response to a first control signal, configured to transmit a first signal outputted by the light-emitting control circuit to a third node to adjust a bias state of the driving transistor.