Touch Sensing Unit Dummy Electrode Structure for Display Devices
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Solution Overview
Problem
The sensitivity of touch sensing units in display devices deteriorates due to undesirable coupling between first and second touch electrodes, leading to unreliable touch input recognition.
Innovation Solution
Incorporating a transmissive area surrounded by dummies, including a main dummy and sub-dummies with specific cuts, to electrically insulate the touch electrodes and prevent unwanted coupling, thereby improving the sensitivity and reliability of the touch sensing unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dummies are added to surround the transmissive area, then coupling between touch electrodes is reduced, but device complexity increases
Solution Approach 1:
The dummy electrodes serve as intermediary elements positioned between the transmissive area and the touch electrodes. These dummies act as a buffer zone that intercepts and dissipates electromagnetic field interference before it can reach the functional touch electrodes, thereby reducing unwanted coupling effects and improving touch sensing reliability without requiring fundamental changes to the touch sensor architecture.
Solution Approach 2:
The dummy structure is segmented into multiple components including a main dummy surrounding the transmissive area and additional sub-dummies positioned at specific locations. This segmentation allows the dummy structure to address coupling issues at different zones independently, providing targeted interference mitigation while maintaining manufacturing feasibility through modular fabrication processes.
2Measurement precision
If multiple sub-dummies are added to improve coupling reduction, then touch sensing sensitivity improves, but manufacturing complexity increases
Solution Approach 1:
The dummy structure employs a nested configuration where sub-dummies are positioned within or adjacent to the main dummy structure. This nesting approach allows multiple functional zones to be created using a hierarchical structure that can be fabricated in fewer manufacturing steps compared to completely separate components, thereby improving touch sensing sensitivity while controlling manufacturing complexity.
Solution Approach 2:
Different regions of the dummy structure possess different geometric characteristics and positions optimized for their specific functional requirements. The main dummy provides overall shielding while sub-dummies provide localized interference reduction at critical areas near the transmissive region. This local optimization enhances touch sensing sensitivity without requiring uniform complexity throughout the entire structure.
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
The use of dummies with strategically placed cuts effectively reduces or prevents undesirable coupling between touch electrodes, enhancing the sensitivity and reliability of the touch sensing unit in display devices.
Implementation Method 1
dummies overlapping the transmitting portion and surrounding the transmissive area... to electrically insulate the touch electrodes and prevent unwanted coupling
Data Source
AI summary
Provided is a display device including a display unit including a display area, a transmitting portion surrounded by the display area, and a non-display area surrounding the display area, and a touch sensing unit having a transmissive area, dummies overlapping the transmitting portion and surrounding the transmissive area, and a touch sensor area surrounding the dummies and including first touch electrodes, and second touch electrodes respectively between the first touch electrodes, connected in a first direction, and spaced apart in a second direction perpendicular to the first direction, wherein the dummies include a main dummy surrounding the transmissive area, and at least one sub-dummy surrounding the main dummy, and wherein an outermost sub-dummy of the at least one sub-dummy that is at an outermost position of the dummies includes a first cut corresponding to a gap between adjacent first and second touch electrodes among the first and second touch electrodes.