Cascaded Shift Register Units for FIC Touch Display
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Solution Overview
Problem
Full-In-Cell (FIC) touch display panels experience adverse effects on display quality during touch detection due to the Long Horizontal Blank (LHB) method, where image scanning is stationary, affecting the touch detection process.
Innovation Solution
A chip-on-film and display substrate design with cascaded shift register units, utilizing multiple output control signal lines to provide different enable signals to adjacent shift register units, ensuring accurate output waveforms during touch detection without impacting scanning performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the Long Horizontal Blank (LHB) method is used for touch detection, then touch detection can be performed between image parts, but the scanning of displayed image becomes stationary and display effect is adversely affected
Solution Approach 1:
The patent divides the shift register units into multiple groups, with each group corresponding to different scanning lines. During touch detection, only the shift register units corresponding to the current scanning line are enabled, while others are disabled. This segmentation allows touch detection to be performed on specific line segments without stopping the overall scanning process, thus maintaining both touch detection accuracy and display scanning performance.
Solution Approach 2:
The patent implements dynamic control of shift register units through enable signals that are activated only during the horizontal blanking period of specific scanning lines. This dynamic enablement allows the system to switch between display mode and touch detection mode on different line segments, ensuring that touch detection does not cause stationary scanning while maintaining display quality on active lines.
2Manufacturing precision
If multiple output control signal lines are used to provide different enable signals to adjacent shift register units, then accurate output waveforms can be maintained during touch detection, but device complexity increases
Solution Approach 1:
The patent applies different enable signal configurations to different local regions (scanning line groups) of the display substrate. Each group of shift register units receives enable signals tailored to its specific scanning lines, allowing precise control of output waveforms in each local region during touch detection while maintaining overall system manageability through modular grouping.
Solution Approach 2:
The control signal lines are segmented into multiple output control signal lines, each responsible for specific groups of shift register units. This segmentation allows independent control of enable signals for different scanning line groups, ensuring accurate output waveforms during touch detection while organizing the complexity into manageable, modular control structures.
Data Source
AI summary
The present disclosure provides a chip-on-film, a display substrate, a display device and a driving method. The display substrate includes a plurality of scanning lines and a plurality of cascaded shift register units coupled to the scanning lines. The display substrate further includes an output control signal line electrically coupled to each shift register unit for providing an enable signal for the shift register unit. The output control signal lines include at least two output control signal lines for providing different enable signals, and two adjacent cascaded shift register units are coupled to different output control signal lines.