OLED Pixel Circuit Segmentation to Reduce Hysteresis
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Solution Overview
Problem
The hysteresis effect of driving transistors in pixel driving circuits of OLED display panels causes image sticking, especially when displaying still images, due to the lack of variation in data voltage during continuous frame display.
Innovation Solution
The implementation of a display panel with first and second light-emitting elements, each connected to separate pixel circuits, where the data voltage received by the first pixel circuit is different from that received by the second pixel circuit, allowing for varying data voltages during different frames to reduce the hysteresis effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single pixel circuit is used to control the light-emitting element, then the device complexity is reduced, but the hysteresis effect causes image sticking and display quality deteriorates
Solution Approach 1:
The pixel circuit is divided into a first pixel circuit and a second pixel circuit. The first pixel circuit controls the first light-emitting element, and the second pixel circuit controls the second light-emitting element. This segmentation allows independent control of different light-emitting elements, enabling the application of different data voltages to reduce the hysteresis effect and improve display quality while maintaining reasonable device complexity.
2Ease of operation
If the same data voltage is applied to the pixel circuit for continuous frame display, then the ease of operation is improved, but the hysteresis effect worsens causing image sticking
Solution Approach 1:
The patent applies different data voltages to the first and second pixel circuits in a periodic manner during continuous frame display. By alternating between different voltage levels, the hysteresis effect is reduced as the transistor operates through different states, preventing image sticking while maintaining ease of operation through systematic voltage control.
Solution Approach 2:
The patent changes the data voltage parameter applied to different pixel circuits. The first pixel circuit receives a first data voltage while the second pixel circuit receives a second data voltage, which are different from each other. This parameter variation reduces the hysteresis effect by preventing the transistor from remaining in the same operational state continuously, thereby eliminating image sticking.
3Object-generated harmful factors
If dual pixel circuits with different data voltages are used, then the hysteresis effect is reduced, but the device complexity increases
Solution Approach 1:
The patent merges the first light-emitting element and the second light-emitting element within a single pixel structure, sharing common components such as the pixel electrode and organic light-emitting layer. This merging approach reduces the overall device complexity while still maintaining separate pixel circuits for independent voltage control, thus reducing the hysteresis effect without excessive complexity increase.
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 effectively alleviates the hysteresis effect, ensuring clear display of still images by allowing different data voltages for each pixel circuit, thereby reducing image sticking and improving display quality.
Implementation Method 1
The organic light-emitting diode (OLED) display panels have the advantages of low power consumption, self-luminescence
Data Source
AI summary
Provided are a display panel, a method for driving a display panel, and a display device. The display panel includes first pixels. The first pixel includes first and second light-emitting elements, and first and second pixel circuits respectively electrically connected to first electrodes of the first and second light-emitting elements. First electrodes of the first and second light-emitting element are independent from each other. Second electrodes of the first and second light-emitting elements are electrically connected to each other. Light-emitting material layers of the first and second light-emitting elements are formed into one piece. When the display panel displays at least one frame of an image, data voltages received by the first pixel circuit and the second pixel circuit in a same first pixel are different from each other. Thus, an influence of hysteresis effect on brightness of the first pixel is reduced to improve the display effect.