External Compensation Circuit for OLED Power Reduction
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Solution Overview
Problem
Current electroluminescent display panels, such as OLEDs, face high power consumption due to dynamic and static power consumption in pixel circuits, which is not efficiently managed, leading to increased energy usage and heat generation.
Innovation Solution
The introduction of external compensation circuits that adjust anode voltages of light emitting devices to match data voltage ends, allowing driving transistors to operate in a linear region, reducing the need for threshold voltage compensation and minimizing power consumption by using fewer switch transistors and optimizing voltage division.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pixel circuits are used with multiple switch transistors for threshold voltage compensation, then the display panel can maintain stable operation, but power consumption increases significantly
Solution Approach 1:
The patent extracts the compensation function from the pixel circuit itself and moves it to an external compensation circuit. By removing the compensation transistors from within the pixel circuit, the design eliminates the static power consumption associated with keeping these transistors operational, while still providing necessary threshold voltage compensation through the external circuit architecture.
Solution Approach 2:
The patent segments the display system into distinct functional modules: pixel circuits for light emission control and external compensation circuits for threshold voltage management. This segmentation allows the pixel circuit to use fewer transistors (reducing power consumption) while the external compensation circuit handles the compensation function separately, maintaining overall system reliability.
2Use of energy by moving object
If external compensation circuits are introduced to adjust anode voltages, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The patent merges multiple pixel circuits that share the same light emitting device into a single external compensation circuit column. By combining the compensation functions for multiple pixels into one external circuit, the design reduces overall complexity compared to providing separate compensation circuits for each pixel, while still achieving effective voltage adjustment and power consumption reduction.
3Illumination intensity
If driving transistors operate in saturation region with threshold voltage compensation, then brightness stability is maintained, but power consumption increases
Solution Approach 1:
The patent changes the operating parameters of the driving transistor by adjusting the anode voltage through external compensation circuits. This voltage adjustment allows the transistor to operate in the linear region rather than saturation region, fundamentally changing the power consumption characteristics while maintaining brightness stability through precise voltage control.
4Stability of the object's composition
If more switch transistors are used in pixel circuits for compensation, then threshold voltage stability is improved, but the number of components and power consumption increase
Solution Approach 1:
The patent extracts the threshold voltage compensation function from the pixel circuit's internal transistor network and relocates it to external compensation circuits. This extraction removes the need for multiple compensation transistors within each pixel circuit, reducing the component count while preserving threshold voltage stability through the external circuit's voltage adjustment capability.
Data Source
AI summary
A display panel and a driving method thereof, and a display apparatus are provided. In the present disclosure, external compensation circuits electrically connected to pixel circuits are added. The external compensation circuits are configured to adjust anode voltages of light emitting devices to cause the anode voltages of the light emitting devices to be consistent with voltages of data voltage ends.