Touch Sensor Electrode Arrangement for Low Ground Mass Accuracy
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Solution Overview
Problem
Touch input devices with Y-OCTA technology face limitations in low ground mass situations, where signals are often detected at multiple points instead of a single touch, leading to inaccurate input detection due to the design of single or double-layer driving and receiving electrodes.
Innovation Solution
A touch input device with a portrait shape featuring a greater vertical length than horizontal length, incorporating a touch sensor with a specific arrangement of first and second electrodes, where the second electrodes are strategically positioned adjacent to first electrodes to minimize the number of channels and bezel width, and a control unit that applies driving signals and receives sensing signals to enhance touch detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single or double-layer driving and receiving electrodes are used in Y-OCTA technology, then the device structure is simplified, but signal detection accuracy deteriorates in low ground mass situations
Solution Approach 1:
The receiving electrode is divided into multiple pairs of electrodes (first receiving electrodes and second receiving electrodes) arranged in different orientations. Each pair detects signals in specific directions, and the control unit combines these segmented detections to achieve accurate touch position identification even in low ground mass situations.
Solution Approach 2:
Different pairs of receiving electrodes are strategically positioned and oriented to detect signals from different directions. The first receiving electrodes are arranged to detect horizontal direction signals while second receiving electrodes detect vertical direction signals, creating localized detection zones that collectively improve overall detection accuracy.
2Measurement precision
If multiple channels are used for touch sensor electrodes, then touch detection accuracy is improved, but the number of channels and bezel width increase
Solution Approach 1:
Each pair of receiving electrodes serves multiple functions: they detect touch signals in specific directions, contribute to overall touch position determination, and work collectively with other electrode pairs. This multi-functionality allows accurate touch detection with fewer channels compared to traditional single-direction electrode arrangements.
Solution Approach 2:
The patent introduces directional detection by arranging receiving electrode pairs in different orientations (horizontal and vertical directions). This adds a dimensional aspect to signal detection, allowing the system to accurately determine touch position by combining signals from multiple directions rather than relying on increased channel count in a single plane.
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 configuration minimizes the total number of channels and reduces the bezel width, improving touch detection accuracy by reducing noise interference and enhancing signal clarity, thereby addressing the low ground mass issue in Y-OCTA technology.
Implementation Method 1
a touch sensor including a plurality of first electrodes arranged in a first direction and a plurality of second electrodes arranged in a second direction
Data Source
AI summary
A touch sensor minimizing the total number of channels for the touch sensor and a width of a bezel. The touch input device having a portrait shape in which a vertical length is greater than a horizontal length according to an embodiment includes: a touch sensor including a plurality of first electrodes arranged in the vertical direction and a plurality of second electrodes arranged in the horizontal direction; and a control unit electrically connected to the plurality of first electrodes and the plurality of second electrodes to control the touch sensor. The second electrode includes a pair of electrodes, one of the pair of electrodes of the second electrode is disposed adjacent to at least one electrode of the plurality of first electrodes, and the other of the pair of electrodes of the second electrode is disposed adjacent to at least one remaining electrode of the plurality of first electrodes.