Input Sensing Layer Segmentation for Ghost Touch Reduction
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Solution Overview
Problem
Display devices with input sensing functions often experience reliability issues due to ghost touch phenomena, where inputs from non-effective regions are misinterpreted as valid inputs, leading to malfunction and reduced sensing accuracy.
Innovation Solution
The implementation of an input sensing layer with a specific configuration, including sensing electrodes, signal lines, and input pads, where the non-effective region is divided into sub-regions with varying intervals and ground lines, and dummy electrodes are used to minimize visibility and prevent misinterpretation of inputs, enhancing sensing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the input sensing layer uses a uniform structure across the entire surface, then the manufacturing process is simple, but ghost touch phenomena occur in non-effective regions reducing sensing reliability
Solution Approach 1:
The input sensing layer is segmented into effective regions and non-effective regions with different structural configurations. The non-effective region is further divided into first, second, and third sub-regions with varying signal line intervals. This segmentation allows each region to be optimized for its specific function, preventing ghost touches in non-effective areas while maintaining proper sensing in effective areas.
Solution Approach 2:
Different regions of the input sensing layer are given different local qualities through varying signal line intervals. The first sub-region has a first interval, the second sub-region has a second interval, and the third sub-region has a third interval, where at least one interval is smaller than the others. This local variation in structure prevents uniform sensing across the entire surface, thereby eliminating ghost touch phenomena in non-effective regions.
2Measurement precision
If signal lines are placed close together to improve sensing sensitivity, then sensing precision improves, but ghost touch phenomena increase in non-effective regions
Solution Approach 1:
The signal lines are segmented into different groups located in different sub-regions (first, second, and third sub-regions) with different intervals. This segmentation allows close spacing in effective sensing regions for high precision while maintaining larger spacing in non-effective regions to prevent ghost touches.
Solution Approach 2:
The interval between signal lines is varied locally across different sub-regions. In effective regions where sensing is needed, signal lines are placed closer together for high sensitivity. In non-effective regions, signal lines are placed farther apart or arranged in patterns that prevent false sensing, thus achieving both high precision and reliability.
3Reliability
If the non-effective region is completely inactive, then ghost touch is prevented, but input device connectivity and signal transmission are compromised
Solution Approach 1:
The non-effective region is segmented into multiple sub-regions (first, second, and third sub-regions) with different signal line configurations. This segmentation allows signal lines to pass through or be present in the non-effective region for connectivity purposes, while the varying intervals ensure that these lines do not generate false sensing signals.
Solution Approach 2:
The signal lines in the non-effective region act as intermediaries for signal transmission and device connectivity. By carefully designing the intervals and arrangements of these lines, the patent enables them to serve as conduits for electrical signals without participating in active sensing, thus maintaining both connectivity and sensing accuracy.
Data Source
AI summary
Provided is a display device including a display panel and an input sensing layer including an effective region and a non-effective region. The input sensing layer includes a plurality of sensing electrodes, a plurality of signal lines, and a plurality of input pads. The non-effective region includes a first region, a second region, and a third region, and the signal lines include first sub-lines in the first region and connected to the sensing electrodes, second sub-lines in the second region and connected to the input pads, and third sub-lines in the third region and connecting the first sub-lines and the second sub-lines. An interval between the third sub-lines in the third region is a first interval which is a constant, and the first interval is smaller than a second interval between the first sub-lines and a third interval between the second sub-lines.