Touch Detection Electrode Block Overlap for Scanning Speed
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Solution Overview
Problem
Existing touch detection devices with electrostatic capacitance systems face challenges in reducing scanning time across the entire screen while maintaining position detection accuracy, as they either lack efficiency in scanning or compromise accuracy due to sequential block scanning methods.
Innovation Solution
A touch detection device with drive electrodes divided into blocks, where each block contains multiple electrodes and has overlapping arrangements, allowing for simultaneous touch detection across smaller regions, reducing scanning time and improving accuracy by applying touch detection signals sequentially across these blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If scanning is executed for each drive electrode individually, then position detection accuracy is maintained, but scanning time increases significantly
Solution Approach 1:
The drive electrodes are divided into multiple blocks (first block, second block, third block, fourth block) that can be scanned independently and simultaneously. This segmentation allows parallel processing of different electrode groups, reducing total scanning time while maintaining detection accuracy within each block through the overlapping arrangement.
Solution Approach 2:
The patent introduces an overlapping arrangement where blocks are arranged not only in sequence but also with spatial overlap. This creates an additional dimensional structure that allows simultaneous scanning of multiple blocks while ensuring continuous coverage, thereby reducing scanning time without sacrificing position detection accuracy.
2Productivity
If blocks are arranged in parallel without overlapping, then scanning efficiency improves, but position detection accuracy deteriorates due to inability to detect movement within blocks
Solution Approach 1:
The overlapping arrangement adds a spatial dimension to the block structure, where blocks extend into each other's territory. This overlapping region creates a transition zone that enables detection of electrode movement within blocks while maintaining the parallel block structure for efficient scanning.
Solution Approach 2:
Different regions of the electrode array have different functional qualities: non-overlapping regions provide scanning efficiency, while overlapping regions provide position detection accuracy. This local differentiation allows the system to optimize both scanning efficiency and detection accuracy in different spatial zones.
3Loss of time
If sequential block scanning is used, then scanning time is reduced compared to individual electrode scanning, but position detection accuracy is compromised
Solution Approach 1:
The electrode array is segmented into multiple blocks that can be scanned in parallel rather than sequentially. This segmentation enables simultaneous processing of multiple electrode groups, reducing scanning time while the overlapping arrangement ensures that position detection accuracy is maintained within each block.
Solution Approach 2:
The overlapping block arrangement creates an additional spatial dimension that allows parallel scanning to maintain detection accuracy. The overlap regions serve as transition zones that preserve the ability to detect electrode movement even when blocks are scanned in parallel rather than sequentially.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables faster scanning of the entire screen while maintaining high accuracy in position detection, as it allows for touch detection on each block and its overlapping regions, improving sensitivity and reducing noise interference.
Implementation Method 1
The electrostatic capacitance-type touch detection device has divided drive electrodes to which a display drive signal is applied in a display operation state and a touch detection drive signal is applied in a touch detection operation state, and has touch detection electrodes. Electrostatic capacitances are formed between divided drive electrodes and divided touch detection electrodes.
Data Source
AI summary
According to an aspect, a touch detection device, includes drive electrodes arranged in parallel in a predetermined direction; touch detection electrodes arranged in parallel in a direction intersecting with the predetermined direction; an operation drive unit applying a touch detection drive signal to the drive electrodes; and a touch detection unit. The drive electrodes are divided into a plurality of drive signal application blocks. Each of the drive signal application blocks has a drive block overlapped portion on which an arrangement order of the drive electrodes is changed such that an area of at least one of the drive electrodes at an end side in the predetermined direction is swapped for an area of at least one of the drive electrodes in an adjacent drive signal application block at an end side in the predetermined direction.