OLED Display Panel Shared Sensing Lines Aperture Ratio
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Solution Overview
Problem
Organic light emitting diode (OLED) display panels face issues with nonuniform display due to varying threshold voltages of driving transistors caused by manufacturing processes and temperature variations, leading to reduced aperture ratio and increased parasitic capacitance, which affects brightness and sensing speed.
Innovation Solution
A display panel design that shares data lines among four pixel circuits and uses shared sensing driving lines to sense and compensate for light emitting currents or voltages, improving threshold voltage sensing and compensation accuracy while reducing parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate sensing driving lines are provided for each pixel circuit, then sensing accuracy is improved, but device complexity and parasitic capacitance increase
Solution Approach 1:
The patent merges the sensing driving lines by having four pixel circuits share a common sensing driving line. The pixel circuits are grouped in sets of four, with each group sharing one sensing driving line, thereby reducing the total number of sensing lines and parasitic capacitance while maintaining sensing capability through sequential or simultaneous operation of the shared line.
Solution Approach 2:
The sensing driving line is designed to serve multiple functions: it can sense signals from multiple pixel circuits (four per line), and can be used for both sensing operations and potentially other driving functions. This multi-functionality reduces the overall number of dedicated lines needed in the display panel.
2Speed
If more sensing driving lines are used, then sensing speed is improved, but parasitic capacitance increases
Solution Approach 1:
Multiple pixel circuits are combined to share common sensing driving lines, reducing the total number of lines and thus reducing parasitic capacitance. The shared sensing lines are managed through coordinated control to maintain sensing speed performance.
Solution Approach 2:
The sensing operation uses periodic action by sequentially enabling different groups of pixel circuits connected to the same sensing driving line. This allows the system to maintain high sensing speed through time-division multiplexing while using fewer physical sensing lines, thereby reducing parasitic capacitance.
3Device complexity
If data lines are shared among pixel circuits, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent merges data line resources by having four pixel circuits share one data line. This sharing arrangement reduces the total number of data lines needed, simplifying the overall device structure. The shared data line is time-division multiplexed to provide data to different pixel circuits at different times, reducing manufacturing complexity while maintaining signal integrity through precise timing control.
Data Source
AI summary
A display panel, a display device, and a compensating method are disclosed. The display panel includes: a plurality of sub-pixels arranged in rows and columns, a plurality of data lines connected to the plurality of sub-pixels, and a plurality of sensing driving lines connected to the plurality of sub-pixels, each of plurality of the sub-pixels includes a pixel circuit; the plurality of sub-pixels constitute a plurality of pixel units, the plurality of pixel units are arranged in a plurality of rows and a plurality of columns, and each of the plurality of pixel units includes four sub-pixels; pixel circuits of the four sub-pixels are connected to a same data line of the plurality of data lines; and the pixel circuits of the four sub-pixels are connected to four sensing driving lines of the plurality of sensing driving lines in a one-to-one correspondence manner.