Touch Sensing Display Block Segmentation for Ghost Touch Detection
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Solution Overview
Problem
As display panels enlarge in size, the number of touch electrodes and touch lines increases, leading to low production yield and high manufacturing costs, and the ghost phenomenon occurs in multi-touch inputs where an untouched point is abnormally recognized as a touch position.
Innovation Solution
A touch sensing display device with a first and second touch block, each comprising a plurality of electrodes and additional electrode patterns, driven by separate circuits to differentiate real from ghost touch positions using synchronized driving signals with varying pulse numbers and amplitudes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of touch electrodes and touch lines is increased to support larger display panels, then the display size is improved, but the production yield decreases and manufacturing cost increases
Solution Approach 1:
The display panel is divided into multiple touch blocks, with each block having its own set of touch electrodes and touch lines. This segmentation allows independent manufacturing and testing of smaller blocks, thereby improving production yield while supporting larger overall display sizes.
2Area of stationary object
If the number of touch electrodes and touch lines is increased to support larger display panels, then the display size is improved, but the manufacturing cost increases
Solution Approach 1:
By segmenting the large display into smaller touch blocks with fewer electrodes and lines each, the manufacturing process becomes simpler and more cost-effective, while still achieving the desired large display size through composition of multiple blocks.
3Measurement precision
If traditional touch sensing is used in multi-touch input, then touch detection is achieved, but the ghost phenomenon occurs where untouched points are abnormally recognized as touch positions
Solution Approach 1:
Dividing the touch sensing area into separate touch blocks with independent electrode patterns allows the system to distinguish between real touch positions and ghost positions by analyzing the distribution and intensity of touch signals across different blocks.
Solution Approach 2:
Each touch block has its own additional electrode pattern with specific local characteristics. By comparing the touch signal patterns across different blocks with their respective local qualities, the system can identify and eliminate false ghost touch detections while maintaining accurate real touch detection.
Data Source
AI summary
A touch sensing display device includes a first touch block including a plurality of first touch electrodes and a first additional electrode pattern, a second touch block including a plurality of second touch electrodes and a second additional electrode pattern, a first touch circuit configured to individually drive a first touch block division line connected to the first additional electrode pattern and a second touch block division line connected to the second additional electrode pattern, and a second touch circuit configured to sense each touch line in synchronization with a driving timing of each of the first touch block division line and the second touch block division line, wherein each touch line electrically connects one of the plurality of first touch electrodes to one of the plurality of second touch electrodes.