Display Touch Sensor Antennas With Short Feed Lines
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Solution Overview
Problem
It is challenging to integrate multiple antennas in display devices without increasing their size or cost, particularly in portable electronics, while maintaining performance characteristics such as luminance.
Innovation Solution
The integration of antenna patterns within the touch sensor area, where they can be formed simultaneously with driving and sensing electrodes, reduces the length of antenna feed lines, eliminates the need for additional processing, and allows for the use of shielding electrodes to block external electric fields, thereby minimizing signal loss and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas are integrated in a display device, then wireless communication capability is improved, but device size increases
Solution Approach 1:
The patent combines antenna patterns with touch sensor electrodes, allowing the same conductive structures to serve dual purposes: touch sensing and wireless communication. The driving electrodes and sensing electrodes of the touch sensor are configured to function as antenna patterns, eliminating the need for separate antenna structures and reducing overall device area.
Solution Approach 2:
The touch sensor electrodes are designed to perform multiple functions simultaneously. The driving electrodes and sensing electrodes not only detect touch inputs but also transmit and receive radio frequency signals for wireless communication, including both first and second polarized waves. This multi-functionality reduces the number of separate components needed.
2Adaptability or versatility
If antenna patterns are added to the display device, then wireless communication is enabled, but manufacturing complexity increases
Solution Approach 1:
The antenna patterns are formed simultaneously with the touch sensor electrodes using the same manufacturing processes. The driving electrodes and sensing electrodes are created in the same fabrication steps as the antenna structures, eliminating additional processing steps and reducing manufacturing complexity.
3Reliability
If antenna feed lines are extended to connect antenna patterns, then signal transmission is improved, but signal loss increases
Solution Approach 1:
The patent extracts and eliminates unnecessary antenna feed lines by directly utilizing the touch sensor electrodes as antenna elements. The driving electrodes and sensing electrodes themselves serve as the radiating elements, removing the need for separate feed line structures and minimizing signal loss pathways.
4Measurement precision
If shielding electrodes are added to block external electric fields, then touch sensing accuracy is improved, but device complexity increases
Solution Approach 1:
The shielding electrodes are integrated with the existing antenna patterns and touch sensor structures. The same conductive elements that function as antennas also serve as shielding structures, blocking external electric fields while maintaining their primary functions. This eliminates the need for separate shielding components.
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 enables efficient transmission and reception of radio frequency signals, reduces signal loss, and maintains high design flexibility for antenna placement, all while preventing battery drain in portable devices.
Implementation Method 1
an antenna that transmits and receives wireless electromagnetic waves for wireless communications
Implementation Method 2
shielding electrodes overlap the antenna feed lines in the third direction (z-axis direction) of the display device, so that the electric field by the radio frequency signals applied to the antenna feed lines from the outside can be blocked by the shielding electrodes
Implementation Method 3
sense a touch of an object or a person using the mutual capacitance between the driving electrodes and the sensing electrodes
Data Source
AI summary
A display device includes: a substrate; a first sensor electrode and a second sensor electrode disposed on the substrate; an antenna electrically separated from the first sensor electrode to transmit and receive radio frequency signals; and an antenna feed line electrically connected to the antenna pattern.