Display Device Shielding Portions for Parasitic Capacitance Reduction
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Solution Overview
Problem
Display devices with touch detection functions face accuracy degradation due to parasitic capacitance, which is difficult to completely prevent even with shielding structures, affecting the accuracy of touch detection.
Innovation Solution
A display device design where shielding portions are formed in touch detection electrodes only when the distance between conductive lines and drive electrodes is less than a predetermined value, and not formed when the distance is greater, to selectively block parasitic capacitance and maintain touch detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If shielding portions are formed in all touch detection electrodes to prevent parasitic capacitance, then parasitic capacitance is reduced, but touch detection accuracy is degraded
Solution Approach 1:
The patent applies local quality by forming shielding portions only in specific touch detection electrodes where the distance to conductive lines is less than a predetermined threshold. This selective approach prevents parasitic capacitance in critical areas while avoiding the formation of shielding portions in other areas that would degrade touch detection accuracy, thus achieving localized optimization rather than uniform treatment across all electrodes.
Solution Approach 2:
The patent utilizes parameter changes by establishing a distance threshold criterion to determine whether to form shielding portions. The decision to form or not form shielding portions is based on the parameter of distance between touch detection electrodes and conductive lines. This parameter-based approach allows dynamic adjustment of shielding configuration to balance parasitic capacitance reduction with touch detection accuracy maintenance.
2Measurement precision
If shielding portions are not formed to maintain touch detection accuracy, then touch detection accuracy is maintained, but parasitic capacitance increases
Solution Approach 1:
The patent applies local quality by forming shielding portions only in specific touch detection electrodes where the distance to conductive lines is less than a predetermined threshold. This selective approach prevents parasitic capacitance in critical areas while avoiding the formation of shielding portions in other areas that would degrade touch detection accuracy, thus achieving localized optimization rather than uniform treatment across all electrodes.
Solution Approach 2:
The patent utilizes parameter changes by establishing a distance threshold criterion to determine whether to form shielding portions. The decision to form or not form shielding portions is based on the parameter of distance between touch detection electrodes and conductive lines. This parameter-based approach allows dynamic adjustment of shielding configuration to balance parasitic capacitance reduction with touch detection accuracy maintenance.
3Object-affected harmful factors
If shielding portions are formed strategically based on distance criteria, then parasitic capacitance is reduced without degrading touch detection accuracy, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing touch detection electrodes into different groups based on their distance relationship with conductive lines. electrodes are segmented into those requiring shielding portions and those not requiring them, based on the distance threshold criterion. This segmentation approach simplifies the overall structure compared to forming shielding portions in all electrodes, while still effectively reducing parasitic capacitance in critical areas.
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 effectively reduces parasitic capacitance and enhances touch detection accuracy by strategically forming shielding portions based on the distance between conductive lines and drive electrodes, improving the overall performance of touch detection in non-rectangular display areas.
Implementation Method 1
parasitic capacitance is generated between the drive electrode and the conductive line connected to the touch detection electrode
Implementation Method 2
a shielding portion (shield pattern electrode) is formed to prevent the generation of parasitic capacitance
Data Source
AI summary
According to one embodiment, a display device includes a plurality of first electrodes overlap a display area, extend in a first direction, and are arranged in a second direction, a plurality of second electrodes overlap the display area, extend in the second direction, and are arranged in the first direction, a plurality of conductive lines are provided along the first electrodes, and connected to the second electrodes, respectively, and a touch detection driver is configured to detect contact or approach of an object with respect to the display area. In a case where a distance between a conductive line and one of the first electrodes near the conductive line is less than a predetermined value, a shielding portion is formed in the second electrode.