Touch Driver Completion Feedback for Blank-Period Signal Interference
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Solution Overview
Problem
Touch driving signals interfere with panel driving signals during blank periods in display devices, affecting the reliability of both operations.
Innovation Solution
A touch driver that outputs a touch driving performing signal after completing touch driving operations, allowing the display panel driver to perform blank period operations in response, thereby reducing signal interference and enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch driving operation is performed during blank period, then touch functionality is maintained, but signal interference with panel driving occurs
Solution Approach 1:
The touch driver performs preliminary actions by completing the touch driving operation and outputting a touch driving performing signal before the blank period operation begins. This ensures that the touch signal applying, receiving, and calculating periods are fully completed, and the display panel driver is notified in advance to prepare for the sensing operation, thereby avoiding signal interference
Solution Approach 2:
The touch driver outputs a touch driving performing signal as feedback to the display panel driver, indicating that the touch driving operation is complete. This feedback mechanism allows the display panel driver to know when to start the sensing operation, ensuring proper timing and avoiding signal interference between touch driving and panel driving operations
2Loss of time
If touch driving operation is completed quickly, then blank period operations can start sooner, but touch signal calculating may be incomplete
Solution Approach 1:
The touch driver includes a completion signal outputting circuit that outputs a touch driving performing signal only after receiving a sensing completion signal from the touch sensing signal receiving circuit. This feedback mechanism ensures that the touch signal calculating period is fully completed before notifying the display panel driver, preventing premature operation start while minimizing time loss
Data Source
AI summary
A display device including: a display panel including a pixel; a touch panel including a touch sensor; and a display panel driver configured to perform a data writing operation to the pixel in an active period and perform a touch driving operation to the touch sensor in a blank period, wherein the display panel driver includes a touch driver configured to perform the tough driving operation and a driving controller configured to control an operation of the display panel and the touch driver, and wherein the touch driver outputs a touch driving performing signal, which indicates that the touch driving operation was performed, in the blank period to the driving controller.