Touch Display Electrode Sharing with Ghost Data Correction
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Solution Overview
Problem
Touch display devices face challenges in increasing size and resolution, leading to increased complexity and manufacturing costs due to the number of touch electrodes and signal lines, which also affect manufacturing thickness and light transmission efficiency.
Innovation Solution
A touch display device with a touch panel divided into blocks, where multiple electrodes share a signal line, and a touch sensing circuit predicts real touch data by distinguishing it from ghost data using a multi-node scheme.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of touch electrodes is increased to improve size and resolution, then the sensing capability is improved, but the number of signal lines and touch channels increases leading to increased device complexity
Solution Approach 1:
Multiple touch electrodes belonging to different blocks are connected to a shared signal line, merging multiple electrode connections into a single signal line. This reduces the total number of signal lines and touch channels while maintaining the ability to sense multiple touch electrodes, thereby improving touch sensing capability without proportionally increasing device complexity
Solution Approach 2:
The touch panel is divided into multiple blocks, and electrodes are organized by block. This segmentation allows for systematic sharing of signal lines across blocks, reducing the overall signal line count while maintaining comprehensive touch sensing coverage across the entire display area
2Reliability
If separate touch panels are stacked to provide touch function, then touch recognition is achieved, but the device thickness increases and manufacturing becomes more complex
Solution Approach 1:
Touch electrodes are embedded within the pixel area of the display panel itself, nesting the touch sensing function inside the existing display structure. This eliminates the need for a separate stacked touch panel, thereby maintaining touch recognition functionality while reducing overall device thickness and simplifying manufacturing
3Device complexity
If multiple touch electrodes share a signal line, then the number of signal lines is reduced, but ghost data is generated affecting touch recognition accuracy
Solution Approach 1:
The touch sensing circuit uses feedback mechanisms to predict the area where real touch data should be generated based on raw data from shared signal lines. By comparing expected touch patterns with actual readings and reflecting ghost data from areas where no real touch should occur, the system can distinguish real touch events from ghost data, maintaining high touch recognition accuracy despite signal line sharing
Solution Approach 2:
The system performs preliminary prediction of touch data generation areas before final touch recognition. By anticipating where real touch data should appear and identifying areas where only ghost data should exist, the system can pre-filter and correct measurements, ensuring accurate touch recognition even when multiple electrodes share signal lines
Data Source
AI summary
A touch display device includes a touch panel having a plurality of touch electrodes and a plurality of signal lines. The touch electrodes are divided into two or more blocks, and touch electrodes belonging to different blocks is connected to one signal line. The touch display device can further include a touch sensing circuit configured to generate raw data based on voltages of the touch electrodes input through the signal lines and determine real touch data from the raw data. The touch sensing circuit predicts an area where the real touch data is able to be generated from raw data of one frame and determines the real touch data by reflecting ghost data generated in areas other than the area where the real touch data is able to be generated in estimated touch data included in the area where the real touch data is able to be generated.