Display Touch Sensing with Regional Voltage and Single/Multi-Channel Driving
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Solution Overview
Problem
Existing display devices face challenges in maintaining uniform touch sensitivity due to variations in touch electrode sizes and driving signal voltages, which affect the accuracy and responsiveness of touch sensing units.
Innovation Solution
The display device employs a sensor area with distinct voltage levels and driving schemes for different regions, using a single-channel and multi-channel approach to uniformly adjust sensing signals, with smaller electrodes receiving lower voltage levels at edges to enhance sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If touch electrodes at different positions are made with different sizes, then touch sensitivity can be optimized for each region, but non-uniform sensing signals are generated across the sensor area
Solution Approach 1:
The patent applies local quality by providing different voltage levels to different regions of the sensor area. Specifically, a first voltage level is provided to a first region and a second voltage level (lower than the first) is provided to a second region. This compensates for the non-uniform sensing signals generated by touch electrodes of different sizes, thereby maintaining uniform touch sensitivity across the entire sensor area while allowing regional optimization.
2Stability of the object's composition
If different voltage levels are supplied to different sensor regions, then uniform sensing signals can be achieved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the sensor area into multiple regions (first region and second region) and supplying different voltage levels to each region through separate touch driving signals. This segmented approach enables uniform sensing signals across the sensor area while managing device complexity through systematic regional division rather than individual electrode control.
3Device complexity
If single-channel driving scheme is used for all channels, then device complexity is reduced, but touch sensitivity cannot be optimized for specific regions
Solution Approach 1:
The patent applies local quality by implementing different driving schemes for different regions. A single-channel driving scheme is used for the first region while a multi-channel driving scheme is used for the second region. This allows touch sensitivity optimization for specific regions through targeted voltage control while managing overall device complexity through selective application of driving schemes.
Data Source
AI summary
A display device is disclosed that includes a sensor area including a plurality of channels each including touch electrodes arranged in a column, a peripheral area located around the sensor area and including touch lines connected to the channels, and a display driver configured to supply touch driving signals to the channels. The sensor area includes a first sensor area located at a first edge of the sensor area, and a second sensor area located adjacent to the first sensor area. The display driver supplies first touch driving signals having a first voltage level to the channels in the first sensor area during a first period, and supplies second touch driving signals having a second voltage level to the channels in the second sensor area during a second period after the first period, the second voltage level being lower than the first voltage level. The display driver supplies the first touch driving signals sequentially to the channels in the first sensor area according to a single-channel driving scheme during the first period, and supplies the second touch driving signals simultaneously to the channels in the second sensor area according to a multi-channel driving scheme during the second period.