Display Touch Pads with Dummy Pads for Signal Noise Reduction
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Solution Overview
Problem
Current display devices face challenges in effectively integrating touch sensing functionality with organic light emitting devices, particularly in reducing signal interference and noise between touch pads, while maintaining flexibility and durability.
Innovation Solution
The display device incorporates a first touch electrode and a second touch electrode with fine electrode lines, a touch pad portion, and a dummy pad portion, where the touch pads and dummy pads are alternately disposed and have varying widths, and are connected via a touch wire, allowing for improved touch signal detection and reduced signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple touch pads are used to cover the display area, then touch sensing coverage is improved, but signal interference and noise between adjacent touch pads increases
Solution Approach 1:
The display area is divided into multiple regions with touch pads arranged in a matrix pattern, where each touch pad is separated by dummy pads. This segmentation reduces signal interference between adjacent touch pads while maintaining comprehensive touch sensing coverage across the entire display area.
Solution Approach 2:
Dummy pads are introduced as intermediary elements between adjacent touch pads. These dummy pads act as buffer zones that electrically isolate the touch pads from each other, reducing capacitive coupling and signal interference while allowing the touch pads to maintain their sensing functionality.
2Object-affected harmful factors
If the number of touch pads and touch wires is reduced, then signal noise is reduced, but touch sensitivity and detection precision may deteriorate
Solution Approach 1:
Different regions of the display are assigned different functions: touch pads are strategically positioned in areas requiring touch detection, while dummy pads are placed in regions where touch sensitivity is less critical. This local differentiation allows reduction of touch wires and pads in low-sensitivity areas, reducing noise while maintaining detection precision in critical areas.
Solution Approach 2:
Instead of providing full touch sensing coverage with uniformly sized touch pads across the entire display area, the invention uses a reduced number of touch pads with varying widths, concentrated in regions where touch input is most likely to occur, thereby reducing overall signal noise while maintaining adequate detection precision for typical user interactions.
3Measurement precision
If touch pads are made wider to improve touch detection, then touch sensitivity is improved, but the number of touch pads that can be accommodated in the display area decreases
Solution Approach 1:
Touch pads are designed with asymmetric width variations rather than uniform sizes. Wider touch pads are placed in regions requiring higher sensitivity (such as central areas where thumbs or fingers naturally rest), while narrower touch pads are used in peripheral areas, allowing optimal sensitivity where needed while accommodating more pads overall.
Solution Approach 2:
Instead of increasing the number of touch pads by reducing their size uniformly, the invention varies the width dimension of touch pads to create a hierarchical structure. This dimensional variation allows the system to achieve both high sensitivity in critical areas and sufficient coverage across the display, balancing detection capability with spatial accommodation.
Data Source
AI summary
A display device includes: a first touch electrode; a first touch pad electrically connected to the first touch electrode by a touch wire; and a first dummy pad not connected to the touch wire, and disposed adjacent to the first touch pad, wherein a width of the first touch pad is greater than a width of the first dummy pad.