Sensor Display Touch Interference Segmentation
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Solution Overview
Problem
Increasing display resolution in sensor-equipped display devices reduces the time available for touch panel operation, leading to interference and decreased performance, as the periods for driving the display and touch panel operations become imbalanced.
Innovation Solution
The device incorporates a configuration with scanning lines, data lines, switching elements, and pixel electrodes, along with a scanning driving unit and a detection control unit that overlap scanning operations for both display and detection, ensuring separate periods while minimizing interference by synchronizing the output of driving signals to avoid overlap between scanning and detection lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the resolution of the display unit is increased, then the display quality is improved, but the period required for driving the display unit increases, resulting in reduced time for touch panel operation
Solution Approach 1:
The patent divides the screen into multiple regions (first region and second region) and performs touch detection in different time periods for each region. The touch detection is segmented into first touch detection periods for the first region and second touch detection periods for the second region, allowing parallel processing and reducing total detection time.
Solution Approach 2:
The patent enables continuous touch detection across the entire screen by overlapping touch detection periods with display periods. The first touch detection periods and second touch detection periods are arranged to cover different time windows, ensuring that touch detection continues without interruption while the display updates.
2Object-affected harmful factors
If sequential driving periods are assigned for display and touch detection, then interference between display and touch panel is suppressed, but the time available for touch panel operation decreases
Solution Approach 1:
The patent employs periodic touch detection within each frame period, dividing the detection into multiple periodic intervals (first touch detection periods and second touch detection periods). These periodic detections are strategically placed to avoid display update moments, reducing interference while accumulating sufficient detection time.
Solution Approach 2:
The patent introduces a temporal dimension by dividing touch detection into multiple time periods (first touch detection periods and second touch detection periods) that overlap with different portions of the display frame period. This multi-dimensional time scheduling allows parallel execution of display and detection operations.
3Reliability
If the screen scanning operation selects scanning lines sequentially, then the display is updated properly, but the time required for complete screen scanning increases
Solution Approach 1:
The patent segments the screen into multiple regions (first region and second region) and performs scanning operations on different regions in parallel during different time periods. This segmentation allows the display to update multiple regions simultaneously rather than sequentially, reducing total scanning time while maintaining update accuracy.
Data Source
AI summary
A sensor-equipped display device includes a scanning driving unit (4) that repeats a scanning operation of selecting scanning lines (G) sequentially in a first direction, and a data driving unit (5) that applies a voltage to data lines (S). The display device further includes a detection control unit (30) that repeats a scanning operation of driving drive lines (DRL) sequentially in the first direction, and detects signals of detection lines (SNL). During a period that overlaps a period for the screen scanning operation with respect to the scanning lines, the detection control unit executes the screen scanning operation with respect to the drive lines, and in the screen scanning operation with respect to the drive lines, the detection control unit outputs the driving signal, avoiding the drive line in an area corresponding to the scanning line that is being selected by the scanning driving unit.