Pixel Circuit Timing for Multi-Refresh Display Panels
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Solution Overview
Problem
Existing display technologies face challenges in achieving different refresh frequencies in different areas of a display device due to mismatched gate driving signals, leading to incomplete reset functions and issues like afterimages and flickers.
Innovation Solution
A display panel design incorporating multiple gate driving circuits and pixel circuits with specific transistor connections, including a compensation transistor that remains turned on for one continuous time period per frame, and initialization and writing transistors operating in a time-sharing manner, to stabilize gate driving signals and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single gate driving circuit is used to output drive signals, then the device complexity is reduced, but the refresh frequency cannot be differentiated across different display areas and the reset function cannot be completely performed
Solution Approach 1:
The gate driving circuit is segmented into multiple independent gate driving circuits (first, second, third, and fourth gate driving circuits), each responsible for driving different display areas. This segmentation enables different refresh frequencies to be applied to different regions while maintaining manageable circuit complexity through modular design.
Solution Approach 2:
The gate driving circuits are configured with dynamic control capabilities, where the compensation transistor remains turned-on for one continuous time period per frame and initialization/writing transistors operate in time-sharing manner. This dynamic operation enables adaptive refresh frequency control across different display areas.
2Reliability
If the compensation transistor operates continuously, then the display stability is improved, but the power consumption increases
Solution Approach 1:
The compensation transistor is configured to remain turned-on for exactly one continuous time period in each frame, creating a periodic action pattern. This ensures display stability during the critical period while allowing power savings during other periods when the transistor can be turned off.
Solution Approach 2:
Instead of keeping the compensation transistor continuously on or off, the invention applies partial action by maintaining it in the on-state for only the necessary continuous time period within each frame, achieving sufficient stabilization without excessive power consumption.
3Reliability
If initialization and writing transistors operate simultaneously, then the reset function is improved, but the device complexity and signal coordination difficulty increase
Solution Approach 1:
The initialization module and writing transistor operate in a time-sharing manner with periodic alternation. During the continuous time period when the compensation transistor is on, these components take turns operating, ensuring complete reset functionality while simplifying signal coordination through structured temporal separation.
Data Source
AI summary
A display including a pixel circuit is provided. The pixel circuit includes a driving transistor, a writing transistor connected in series between a data line and the second node or the third node, an initialization module, and a compensation transistor connected in series between the first node and the second node or the third node. In the driving transistor, a gate is connected to the first node, a first electrode is connected to the second node, and a second electrode is connected to the third node. A gate of the writing transistor is connected to a scanning signal. The initialization module is connected to the first, second, and/or third nodes to perform resetting. The compensation transistor remains a turned-on state in only one continuous time period in each frame, and the initialization module and the writing transistor turn on in a time-sharing manner in the continuous time period.