Touch Panel Electrode Grouping for ADC Pin Reduction
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Solution Overview
Problem
Touch driving devices with limited analog-to-digital converters (ADCs) face increased processing time due to the need for multiple read operations across a large number of sensing electrodes in touch panels, which is inefficient and costly.
Innovation Solution
The touch panel is designed with sensing electrodes organized into columns of dispersed sensing electrode groups, each coupled to a single pad, allowing the touch driving device to reduce the number of reads and pins required, optimizing data conversion with existing ADCs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the number of analog-to-digital converters is reduced to lower circuit cost, then the processing time of the touch driving device increases
Solution Approach 1:
The sensing electrode array is segmented into multiple sensing electrode groups, where each group shares a common pad. This segmentation allows multiple sensing electrodes to be processed through fewer ADCs by grouping them logically, reducing the number of ADCs needed while maintaining processing efficiency
Solution Approach 2:
Multiple sensing electrodes are merged into sensing electrode groups that share common pads and are processed by the same ADC. This merging reduces the total number of ADCs required, directly addressing the contradiction between reducing circuit cost and maintaining processing time
2Device complexity
If the number of pins of the touch driving device is reduced, then the number of times the touch driving device reads the touch panel increases
Solution Approach 1:
The sensing electrodes are segmented into groups that share common pads, reducing the number of pins needed. Each pin connects to a pad that serves multiple sensing electrode groups, thereby reducing overall device complexity while managing read operations efficiently
Solution Approach 2:
Each pad serves multiple sensing electrode groups, making it multi-functional. This universality allows fewer pins to handle more sensing electrodes, reducing device complexity while the system compensates by optimizing the read operation schedule
3Quantity of substance
If multiple read operations are performed to process sensing signals of more sensing electrodes, then the circuit cost increases
Solution Approach 1:
The large number of sensing electrodes is segmented into multiple groups that share common pads. This segmentation allows the system to handle more sensing electrodes without proportionally increasing the number of ADCs and pins, thereby controlling circuit cost while increasing the quantity of sensing electrodes
Solution Approach 2:
Multiple sensing electrodes are merged into groups that share common pads and are processed by shared ADCs. This merging reduces the per-electrode circuit cost, allowing more sensing electrodes to be implemented without linearly increasing overall circuit cost
Data Source
AI summary
The invention provides a touch control apparatus and a touch panel thereof. The touch panel includes a plurality of pads and a plurality of sensing electrodes. The pads are suitable for being electrically connected to different pins of a touch driving device. The sensing electrodes are suitable for sensing a touch event of the touch panel. Any column of the sensing electrodes includes a plurality of sensing electrode groups. A plurality of sensing electrodes belonging to any one of the sensing electrode groups among the sensing electrodes are coupled to a corresponding one of the pads. The sensing electrodes in each of sensing electrode groups in a same column are dispersedly arranged in the same column. The arrangement of the sensing electrode groups in any column of the sensing electrodes is different from the arrangement of the sensing electrode groups in an adjacent column adjacent to the any column.