OLED Pixel Circuit Voltage Compensation and Dynamic Resolution
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Solution Overview
Problem
OLED displays face inconsistencies in light emission due to varying threshold voltages of driving transistors, affecting display quality and resolution, and existing technologies cannot dynamically adjust resolution in real time based on user attention.
Innovation Solution
A pixel circuit with a voltage compensation sub-circuit that generates a compensation voltage to stabilize the driving current, combined with a method to adjust display resolution by controlling data signals and light emitting control signals, allowing for real-time resolution adjustment based on user attention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If threshold voltage compensation is implemented using existing methods, then display uniformity is improved, but device complexity and manufacturing difficulty increase due to additional circuit structures
Solution Approach 1:
The patent extracts the threshold voltage compensation function from complex multi-transistor circuit structures and implements it using a simplified capacitor-based voltage storage and transfer mechanism. By taking out the essential compensation function and implementing it through minimal additional components (compensation capacitor and control transistors), the patent achieves threshold voltage compensation without the complexity of existing methods that require multiple compensation transistors and complex wiring.
Solution Approach 2:
The patent changes the operating parameters of the driving transistor by storing the threshold voltage information in a capacitor and using it to adjust the gate voltage dynamically. This parameter change approach allows the circuit to adapt to threshold voltage drift without requiring complex structural modifications, thereby improving display uniformity while maintaining circuit simplicity.
2Manufacturing precision
If resolution is increased across the entire display panel, then visual quality is improved, but power consumption increases significantly
Solution Approach 1:
The patent applies local quality by enabling different resolution levels in different regions of the display panel based on user attention. By controlling which pixel rows are actively driven at high resolution versus low resolution, the patent provides high visual quality where needed while reducing power consumption in less critical areas, achieving a balance between display quality and energy efficiency.
Solution Approach 2:
The patent implements dynamic resolution adjustment that allows the display to switch between different resolution modes based on real-time user interaction and attention patterns. This dynamic capability enables the system to optimize power consumption by lowering resolution in static or less important regions while maintaining high resolution in areas requiring detailed visualization, thereby resolving the contradiction between resolution and power consumption.
3Device complexity
If threshold voltage drift is not compensated, then device complexity remains low, but display quality deteriorates due to inconsistent light emission
Solution Approach 1:
The patent applies preliminary action by pre-measuring and storing the threshold voltage of each driving transistor in a compensation capacitor before the actual display operation. This preliminary compensation action ensures that subsequent light emission is consistent across all pixels, preventing display quality deterioration without requiring complex real-time adjustment mechanisms during operation.
Solution Approach 2:
The patent implements feedback by using the stored threshold voltage information to continuously adjust the driving voltage of each pixel, compensating for threshold voltage drift over time. This feedback mechanism ensures display quality consistency while maintaining relatively simple circuit architecture, as the compensation is achieved through voltage adjustment rather than complex circuit reconfiguration.
Data Source
AI summary
This application provides a pixel circuit and a driving method thereof, and a display panel. The pixel circuit includes: an input unit, a driving unit and a voltage compensation unit, wherein the input unit is connected to a data line and a first scan line, and configured to input a hopping data signal inputted at the data line to the voltage compensation unit under control of the first scan line; the voltage compensation unit is connected to a first node, a second scan line and a third scan line, and configured to generate a compensation voltage at the first node under control of the second scan line and the third scan line; the driving unit is connected to the voltage compensating unit, and configured to generate a current for driving a light emitting device to emit light using the compensation voltage generated by the voltage compensating unit at the first node. In the pixel circuit and the driving method thereof and the display panel according to the present disclosure, threshold voltage compensation performed on the driving transistor of the pixel circuit and smart displaying are combined, and resolution of the display panel can be adjusted in real time with respect to that the user has different attentions on the picture displayed by the display panel.