OLED Pixel Circuit Multiplexing Sensing Line Aperture Ratio
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Solution Overview
Problem
The addition of sensing lines in OLED pixel circuits for compensation purposes reduces the aperture ratio and increases manufacturing costs due to the need for multiple sensing channels.
Innovation Solution
A pixel circuit design that incorporates a multiplexing module and driving modules to transfer detection and light-emitting signals via a single sensing line, improving aperture ratio and reducing the number of sensing lines required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensing lines are added to OLED pixel circuits for compensation purposes, then compensation accuracy is improved, but aperture ratio is reduced
Solution Approach 1:
The patent combines the sensing line function with the existing data line by using a multiplexing module. The same physical line serves dual purposes: transferring data voltages during normal operation and transferring detection voltages during compensation mode. This merging eliminates the need for separate sensing lines, thereby maintaining aperture ratio while achieving compensation accuracy.
Solution Approach 2:
The multiplexing module enables the data line to perform multiple functions: it acts as a data transmission line during light-emitting mode and as a sensing line during detection mode. This multi-functionality allows the system to achieve compensation capabilities without adding dedicated sensing lines, thus preserving the aperture ratio.
2Measurement precision
If separate sensing lines are provided for each sub-pixel, then compensation precision is improved, but the number of sensing channels increases
Solution Approach 1:
The patent merges multiple sensing functions into a single shared sensing line. The multiplexing module time-division multiplexes the detection of multiple sub-pixels through one common sensing line, eliminating the need for separate sensing lines for each sub-pixel. This reduces the number of sensing channels while maintaining compensation precision through sequential detection.
Solution Approach 2:
The system uses periodic time-division multiplexing to detect multiple sub-pixels sequentially through a single sensing line. Each sub-pixel is detected in alternating time slots, allowing the same sensing line to serve multiple pixels without interference. This periodic action reduces the number of required sensing channels while maintaining detection precision.
Data Source
AI summary
Disclosed is a pixel circuit which includes a multiplexing module and a plurality of sub-pixels. Signals for detecting parameters of respective sub-pixels are transferred via a sensing line in a time-divisional manner. For each sub-pixel, connection to the data line and the sensing line is achieved via a common terminal. Further disclosed are a display panel and a display device.