Touch Panel Channel Scanning with Non-Adjacent ADC Segmentation
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Solution Overview
Problem
As touch panels increase in size, the complexity of circuit layout due to increased channels and channel length hampers sensing accuracy and scanning speed, particularly in multi-touch capacitive panels that rely on multiple analog-to-digital converters (ADCs).
Innovation Solution
A scanning method is introduced that optimizes the placement and usage of ADCs by dividing channels into horizontal and vertical groups, allowing for simultaneous scanning of non-adjacent channels using multiple ADCs, with a predetermined sequence that alternates between even and odd channels within each group to enhance scanning efficiency and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of channels and channel length are increased to accommodate larger touch panels, then the coverage area is improved, but the circuit layout complexity increases and sensing accuracy deteriorates
Solution Approach 1:
The patent divides the touch panel channels into horizontal channel groups and vertical channel groups, with each group independently scanned by dedicated ADCs. This segmentation reduces the complexity of individual channel groups while maintaining comprehensive coverage of the entire touch panel area.
2Area of stationary object
If the number of channels and channel length are increased to accommodate larger touch panels, then the coverage area is improved, but the sensing accuracy deteriorates
Solution Approach 1:
By segmenting channels into horizontal and vertical groups that are scanned separately and simultaneously, the patent reduces interference between adjacent channels while maintaining high sensing accuracy across the entire touch panel area.
Solution Approach 2:
The patent combines multiple ADCs to simultaneously scan multiple non-adjacent channels within the same channel group, thereby improving sensing accuracy through parallel processing while covering the entire touch panel area.
3Productivity
If multiple ADCs are used to scan multiple channels simultaneously, then the scanning speed is improved, but the channel layout complexity increases
Solution Approach 1:
The patent segments channels into horizontal and vertical groups with specific scanning patterns, allowing multiple ADCs to simultaneously scan non-adjacent channels within each group. This segmentation enables high-speed parallel scanning while maintaining manageable layout complexity through systematic organization.
Solution Approach 2:
The patent implements dynamic scanning where ADCs can be assigned to different channel groups (horizontal or vertical) based on scanning requirements. This dynamic allocation optimizes scanning speed while adapting to the specific channel layout configuration.
4Productivity
If adjacent channels are scanned simultaneously by multiple ADCs, then the scanning speed is improved, but interference occurs and sensing accuracy deteriorates
Solution Approach 1:
The patent segments the channel scanning task by assigning non-adjacent channels within each group to different ADCs for simultaneous scanning. This segmentation prevents interference between adjacent channels while maintaining high scanning speed through parallel processing of independent channels.
Data Source
AI summary
A scanning method of a touch panel is provided. The touch panel has a horizontal channel group including a plurality of horizontal channels and a vertical channel group including a plurality of vertical channels. According to the scanning method, N channels may be scanned simultaneously, wherein the N channels are selected from the horizontal channel group or the vertical channel group, the N channels are not adjacent to each other, N is a positive integer, and N is less than a channel amount of the selected channel group. Thereby, the scanning speed and the sensing accuracy of the touch panel using the scanning method are enhanced.