In-Cell Touch Detection Noise Flattening via Block Region Summation
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Solution Overview
Problem
In-cell touch-type display devices face reduced touch sensitivity due to the longer distance from the touch surface to the common electrodes used as touch sensors, compared to out-cell display devices, which affects the detection accuracy and reliability.
Innovation Solution
The implementation of a touch detection system that groups delta values from multiple common electrodes into block regions, allowing for noise flattening and signal enhancement through summation and weighting methods, thereby improving touch detection sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If common electrodes are used for both image display and touch detection in in-cell display devices, then device complexity is reduced, but touch detection sensitivity deteriorates due to longer distance from touch surface to electrodes
Solution Approach 1:
The patent combines image display and touch detection functions into a single common electrode structure, eliminating the need for separate touch sensor electrodes. This merging reduces device complexity while the block region summation technique compensates for the reduced touch sensitivity by aggregating signals from multiple adjacent electrodes to enhance detection capability.
2Adaptability or versatility
If multiple common electrodes are divided and used as touch sensor electrodes, then touch detection function is enabled, but noise increases affecting detection accuracy
Solution Approach 1:
The patent divides the common electrode into multiple block regions, each comprising several adjacent common electrodes. By segmenting the electrode structure into manageable blocks and summing the detection values within each block, the system enables touch detection functionality while reducing noise impact through spatial averaging across multiple electrodes.
3Reliability
If block regions are formed by grouping common electrodes, then signal-to-noise ratio is improved, but detection value calculation complexity increases
Solution Approach 1:
The patent segments the electrode array into block regions and implements a systematic calculation method where detection values are summed within each block. This segmentation approach improves signal-to-noise ratio by averaging out random noise across multiple electrodes, while the structured block-based calculation maintains computational efficiency through localized processing.
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 enhances the signal-to-noise ratio, allowing for more accurate detection of touch positions, including those made with conductive objects like fingers or styluses, even in in-cell display devices with longer electrode-to-surface distances.
Implementation Method 1
acquires a plurality of detection values that are based on capacitance of each of the plurality of common electrodes
Data Source
AI summary
A detection value acquirer acquires a plurality of detection values that are based on capacitance of each of a plurality of common electrodes arranged in a matrix. A detection value calculator calculates detection values in a plurality of block regions each containing two or more common electrodes out of the plurality of common electrodes based on the plurality of detection values. A touch detector detects a touch by a conductor on the display screen of a display device based on the detection value of each of the plurality of block regions. The detection value calculator calculates the detection value of each of the plurality of block regions in the display screen based on the detection value of each of the two or more common electrodes included in each of the plurality of block regions.