OLED Display Panel Multiplexing Circuit for Threshold Voltage Compensation
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Solution Overview
Problem
High refreshing rates in OLED display panels lead to insufficient threshold voltage compensation due to short data writing times, resulting in poor display uniformity and brightness issues.
Innovation Solution
The display panel design includes a pixel unit group with adjacent first and second pixel units, connected through shared gate and light emitting control lines, and a multiplexing circuit that allows simultaneous data signal writing to both units during the same period, extending the compensation phase and improving threshold voltage compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high refreshing rate is implemented in OLED display panel, then display speed and responsiveness are improved, but data writing time becomes insufficient leading to poor threshold voltage compensation
Solution Approach 1:
The pixel array is divided into multiple pixel units (first pixel unit, second pixel unit, etc.) that can be driven independently. Each pixel unit has its own pixel circuit with separate control terminals, allowing segmented scanning and data writing operations. This segmentation enables the display to maintain high refresh rates while providing sufficient data writing time for each segment, thereby ensuring proper threshold voltage compensation.
2Speed
If high refreshing rate is implemented in OLED display panel, then display speed is improved, but display uniformity deteriorates due to insufficient threshold voltage compensation
Solution Approach 1:
By segmenting the pixel array into multiple independently controllable pixel units, the patent enables differentiated timing control for scanning and data writing in each segment. This allows sufficient compensation time to be allocated to each pixel unit even at high refresh rates, ensuring uniform threshold voltage compensation across the entire display and improving display uniformity.
3Reliability
If traditional scanning method is used with separate gate lines for each pixel unit, then each pixel receives dedicated control, but circuit complexity and number of control lines increase
Solution Approach 1:
The patent merges the scanning control of multiple pixel units by using shared gate lines and control terminals. Specifically, adjacent pixel units share common gate lines and control terminals, allowing simultaneous control of multiple pixels through fewer lines. This merging approach maintains precise pixel control while significantly reducing the number of control lines and circuit complexity compared to fully dedicated control for each pixel.
Solution Approach 2:
The control terminals and gate lines are designed with multi-functionality to serve multiple pixel units. A single gate line can control multiple pixel units during different time periods, and control terminals can function for both scanning and data writing operations. This universal design reduces the overall number of control lines needed while maintaining effective pixel control precision.
Data Source
AI summary
The disclosure relates to a display panel. The display panel may include a pixel unit group and a scanning circuit. The pixel unit group may include a first pixel unit and a second pixel unit. The scanning circuit may include a first scan signal terminal and a second scan signal terminal. The first scan signal terminal may be configured to simultaneously provide a same gate signal to the first pixel unit and the second pixel unit, and/or the second scan signal terminal may be configured to simultaneously provide a same light emitting control signal to the first pixel unit and the second pixel unit.