Pixel Circuit Shared Data Sensing Line
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Solution Overview
Problem
In OLED display technology, the separation of data and sensing lines limits the physical resolution and speed of compensation in external compensation pixel circuits, making it inefficient for improving panel performance.
Innovation Solution
A pixel driving circuit is designed with a combined data and sensing line, incorporating a driving circuit, energy storage circuit, initialization circuits, and a data writing circuit, which allows for the generation of driving current and sensing signals, enabling efficient data input and output, and compensating for external compensation values, thereby reducing the number of channels in the data driving circuit chip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate data line and sensing line are used in external compensation pixel circuit, then data input and sensing output can be performed independently, but the number of channels in data driving circuit chip increases, limiting physical resolution improvement and compensation speed
Solution Approach 1:
The patent combines the data line and sensing line into a single shared line that serves dual purposes. During different time periods within a frame, the same physical line is used for data input and for sensing output, thereby reducing the number of required channels in the data driving circuit chip while maintaining both data input and sensing functions
Solution Approach 2:
The patent implements dynamic multiplexing where the shared line alternates between data input mode and sensing output mode through controlled switching. The circuit dynamically changes its function based on the current operation phase, allowing the same physical infrastructure to support multiple functions without interference
2Productivity
If separate data line and sensing line are used, then signal interference is minimized, but the compensation speed and physical resolution are limited
Solution Approach 1:
The patent employs periodic time-division multiplexing where the shared line alternates between data input operations and sensing output operations in regular time intervals. This periodic switching ensures that data writing and sensing readings occur at different times, preventing signal interference while enabling faster compensation through reduced channel overhead
Solution Approach 2:
The patent maintains continuous operation by seamlessly transitioning the shared line between data input and sensing output modes without idle periods. The compensation process continues uninterrupted through efficient time-division multiplexing, maximizing the utilization of the shared line while maintaining high compensation speed
Data Source
AI summary
The present disclosure discloses a pixel driving circuit and a method of driving the same, a display panel and a display apparatus. The pixel driving circuit includes: a driving circuit, an energy storage circuit, a data and sensing line, a first initialization circuit, a second initialization circuit and a data writing circuit. The data and sensing line is configured to input a data signal or output a sensing signal; the first initialization circuit is configured to provide a potential at a voltage supply terminal to a control terminal of the driving circuit under control of a potential at a first control line; the second initialization circuit is configured to provide a potential at a second terminal of the driving circuit as the sensing signal to the data and sensing line under control of a potential at a second control line; and the data writing circuit is configured to provide the data signal input at the data and sensing line to the control terminal of the driving circuit under control of a potential at a third control line.