Gate Driving Circuit Integrating Scan and Sensing Signals
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Solution Overview
Problem
The complexity and size of gate driving circuits in organic light emitting display devices increase due to the need for separate sensing and scan drivers, leading to luminance variations and image blurring, which complicates the integration and reduces the yield of these devices.
Innovation Solution
A gate driving circuit with stages that output both scan and sensing signals using a single shift register and a sensing signal output block, which maintains or changes the sensing signal level based on control signals, simplifying the circuit structure and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate sensing driver and scan driver are used, then pixel sensing and scanning functions are achieved, but gate driving circuit size and complexity increase
Solution Approach 1:
The patent combines the sensing driver and scan driver into a single integrated gate driving circuit. The sensing signal output block is integrated within the gate driving circuit structure, allowing both sensing and scanning functions to be performed by one unified circuit rather than separate independent drivers, thereby reducing overall circuit complexity while maintaining functional reliability
Solution Approach 2:
The gate driving circuit is designed with multi-functionality to perform both sensing operations and scanning operations. The sensing signal output block can output sensing signals for pixel compensation while the same circuit structure also outputs scan signals for driving the display panel, making the circuit versatile and eliminating the need for dedicated separate drivers
2Reliability
If separate sensing driver and scan driver are used, then pixel sensing and scanning functions are achieved, but integration space in display panel increases
Solution Approach 1:
The patent merges the sensing driver and scan driver into a single integrated gate driving circuit. The sensing signal output block is integrated within the gate driving circuit structure, allowing both sensing and scanning functions to be performed by one unified circuit rather than separate independent drivers, thereby reducing overall circuit complexity while maintaining functional reliability
Solution Approach 2:
The gate driving circuit is designed with multi-functionality to perform both sensing operations and scanning operations. The sensing signal output block can output sensing signals for pixel compensation while the same circuit structure also outputs scan signals for driving the display panel, making the circuit versatile and eliminating the need for dedicated separate drivers
3Reliability
If multiple shift registers are used for sensing and scan signals, then signal output reliability is improved, but circuit structure complexity increases
Solution Approach 1:
The patent makes the single shift register multi-functional by enabling it to output both scan signals and sensing signals through the sensing signal output block. This eliminates the need for separate shift registers for sensing and scanning operations, reducing the number of components while maintaining signal output reliability through proper signal routing and control
Data Source
AI summary
A gate driving circuit including a plurality of stages to respectively output a plurality of scan signals, an N-th stage of the stages includes: a shift register to output an N-th scan signal based on an (N−1)-th scan signal; and a sensing signal output block connected to the shift register and to output an (N−1)-th sensing signal for compensation of a pixel based on a sensing control signal and a data control signal, where N is an integer greater than 1.