Grouped Touch-Electrode Driving Circuit for Stylus and Finger Modes
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Solution Overview
Problem
Current capacitive touch-control display devices are limited to finger touch-control modes and lack the capability for high-precision stylus touch-control, restricting their application scope due to the wide emitting electrodes, which also lead to increased power consumption and elongated detection periods.
Innovation Solution
A touch-control panel and display device design featuring a plurality of emitting electrodes divided into groups, allowing for both finger and stylus touch-control modes by electrically connecting or segregating the electrodes depending on the mode, with a driving circuit that sequentially transits detecting signals to achieve precise touch detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the width of touch-control emitting electrodes is increased to improve signal strength and reduce noise, then the touch-control detecting capability is enhanced, but the touch-control modes that may be realized are limited and the application scope is narrowed
Solution Approach 1:
The emitting electrodes are divided into multiple groups along the first direction, with each group containing multiple emitting electrodes. The touch-control driving circuit can selectively activate different groups or individual electrodes within groups, enabling both broad-area finger touch detection and precise stylus touch detection. This segmentation allows the system to adapt between different touch modes by controlling which electrode groups are active.
2Ease of manufacture
If the touch-control emitting electrodes are arranged with larger spacing to reduce interference between electrodes, then the manufacturing complexity is reduced, but the measurement precision for high-precision touch-control mode is insufficient
Solution Approach 1:
The touch-control system dynamically switches between different operational modes: in finger touch mode, multiple electrode groups are activated simultaneously to provide broad coverage; in stylus touch mode, individual electrodes within groups are selectively activated to achieve high precision. The driving circuit dynamically adjusts which electrodes are active based on the detected touch type, optimizing both manufacturing simplicity and measurement precision.
3Measurement precision
If the width of touch-control emitting electrodes is reduced to enable high-precision stylus touch-control mode, then the touch-control precision is improved, but the power consumption increases and the detecting period is elongated
Solution Approach 1:
Instead of activating all emitting electrodes simultaneously in the high-precision mode, the system activates only the necessary subset of electrodes within each group required to detect the stylus touch. The driving circuit intelligently selects which electrode groups and individual electrodes to activate based on the touch detection needs, reducing power consumption while maintaining high precision. This partial action approach avoids the excessive power consumption that would result from activating all electrodes.
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
Enables broader application of touch-control devices by supporting both finger and stylus modes, reducing power consumption and elongated detection periods, thereby enhancing precision and usability.
Implementation Method 1
the capacitive touch-control structures may be divided into self-capacitive touch-control structures and mutual capacitive touch-control structures
Data Source
AI summary
A touch-control panel and a touch-control display device are provided. The touch-control panel comprises a plurality of touch-control emitting electrodes arranged along a first direction, a plurality of touch-control receiving electrodes arranged along a second direction, and a touch-control driving circuit electrically with the plurality of touch-control emitting electrodes. The plurality of touch-control emitting electrodes are divided into a plurality of touch control emitting electrode groups along the first direction. The first direction crosses or intersects the second direction. In a first touch-control mode, the touch-control driving circuit is configured to electrically connect all touch-control emitting electrodes in a same touch-control emitting electrode group, and sequentially transit a touch-control detecting signal to the plurality of touch-control emitting electrode groups. In a second touch-control mode, the touch-control driving circuit is configured to sequentially transit the touch-control detecting signal to the plurality of touch-control emitting electrode.