Display Panel Preset-Signal Transition for Reduced Horizontal Stripes
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Solution Overview
Problem
OLED display panels experience significant brightness differences and horizontal stripes at the junction of different display areas due to varying drive signal frequencies, leading to poor display effects.
Innovation Solution
Implement a transition phase during which the preset signal changes from a first preset signal to a second preset signal, with the control signal controlling the preset module to be turned off, thereby reducing the influence of horizontal stripes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different data refresh frequencies are used for different display areas, then the display needs of different areas are met, but brightness differences and horizontal stripes appear at the junction
Solution Approach 1:
The patent introduces a transition phase before the actual data write phase to pre-change the preset signal from the first preset signal to the second preset signal. This preliminary action allows the signal transition to be completed before the main display update, preventing brightness differences and horizontal stripes at the junction of different display areas with different refresh frequencies.
2Adaptability or versatility
If the preset signal changes during data refresh, then the display can adapt to different refresh frequencies, but horizontal stripes appear at the connection between display areas
Solution Approach 1:
The preset signal change is performed in advance during a transition phase before the data write phase begins. This ensures that the signal transition is completed beforehand, and the horizontal stripes generated during signal changes do not appear in the final display output.
Solution Approach 2:
The patent extracts the signal transition process from the main data refresh cycle by introducing a separate transition phase. During this extracted phase, the preset signal changes from the first preset signal to the second preset signal, while the actual data write operation uses the stable second preset signal, thereby removing the harmful horizontal stripe effect.
3Productivity
If the preset module remains on during frequency transition, then the display continues to update, but the transition causes visible artifacts
Solution Approach 1:
The preset module is turned off during the transition phase before the data write phase begins. This preliminary action ensures that no new pixels are generated during the signal transition, preventing visible artifacts. After the transition phase, the preset module is turned on again with the new preset signal ready for the next data write operation.
Data Source
AI summary
Provided is a display panel. The display panel includes a pixel circuit and a driver circuit. The pixel circuit includes a drive module and a preset module. The preset module is configured to provide a preset signal for the drive module. The driver circuit is configured to provide a control signal for the preset module. At least part of the time period during which the display panel operates includes a transition phase. The transition phase is between the end of a retention frame of the first data refresh area and the start of a data write frame of the second data refresh area. Alternatively, the transition phase is between the end of a data write frame of the second data refresh area and the start of a retention frame of the first data refresh area.