Variant Touch Electrodes for Display Through-Hole Sensitivity
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Solution Overview
Problem
Display devices face a reduction in touch sensing sensitivity due to the area loss of touch electrodes caused by through-holes for components like cameras or optical sensors, leading to degraded touch performance.
Innovation Solution
The implementation of variant touch-sensing and touch-driving electrodes with altered shapes and configurations adjacent to non-display areas, including floating electrodes, to compensate for area losses and enhance effective electrode areas, thereby improving touch sensing sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If through-holes are introduced for cameras or optical sensors, then device functionality is enhanced, but touch electrode area is reduced leading to degraded touch sensing sensitivity
Solution Approach 1:
The patent applies local quality by configuring specific sub-touch-sensing electrodes adjacent to through-holes with different shapes (variant electrodes) compared to other electrodes. These variant electrodes have extended areas that compensate for the area loss caused by through-holes, while maintaining the standard configuration elsewhere. This localized modification preserves touch sensing sensitivity in critical areas without compromising overall device functionality.
Solution Approach 2:
The patent changes the geometric parameters (shape and area) of specific touch electrodes adjacent to through-holes. By modifying the shape of variant electrodes to have larger effective areas, the patent compensates for the area reduction caused by through-holes, thereby maintaining touch sensing sensitivity while allowing through-holes for camera or sensor integration.
2Measurement precision
If touch electrode area is increased to compensate for through-hole losses, then touch sensing sensitivity is improved, but device complexity increases due to variant electrode configurations
Solution Approach 1:
The patent minimizes device complexity by applying the variant electrode configuration only locally where needed - specifically for sub-touch-sensing electrodes adjacent to through-holes. The majority of electrodes maintain standard configurations, reducing the overall complexity increase while still achieving touch sensing sensitivity compensation in critical areas.
Solution Approach 2:
The patent segments the touch sensing electrode array into standard electrodes and variant electrodes based on their proximity to through-holes. This segmentation allows for targeted area compensation only where necessary, rather than uniformly increasing all electrode areas, thereby limiting the increase in device complexity to only the minimum required areas.
Data Source
AI summary
Discussed is a display device including a substrate having a display area and a non-display area in the display area, light-emitting elements disposed in the display area, an encapsulation unit covering the light-emitting elements, a plurality of touch-sensing electrodes on the encapsulation unit in the display area and extending in a first direction, and a plurality of touch-driving electrodes on the encapsulation unit in the display area and extending in a second direction different from the first direction, in which the plurality of touch-sensing electrodes include a plurality of sub-touch-sensing electrodes spaced apart from each other, and in which at least one sub-touch-sensing electrode, which is adjacent to the non-display area among the plurality of sub-touch-sensing electrodes, is configured as a first variant electrode having a shape different from a shape of a remaining sub-touch-sensing electrode except for the at least one sub-touch-sensing electrode among the plurality of sub-touch-sensing electrodes.