Frame Area Touch Detection Using Level Shifted Electrostatic Capacitance
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Solution Overview
Problem
Current display devices with touch detection functions cannot effectively detect contact or proximity of objects in the frame area, limiting user interaction and functionality outside the primary display area.
Innovation Solution
Incorporating first and second electrodes in a display device with a touch detection driver and level shifter, allowing for touch detection in the frame area based on electrostatic capacitance, and using a cover base to extend the touch detection area by arranging drive and touch detection electrodes in the frame area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If touch detection function is limited to display area only, then device complexity is reduced, but touch detection area is insufficient
Solution Approach 1:
The second electrode in the cover base serves dual purposes: it acts as a protective structural component of the display device and simultaneously functions as a touch detection electrode for the frame area. This multi-functionality allows touch detection in the frame area without adding separate dedicated components, thereby expanding the touch detection area while minimizing the increase in device complexity.
Solution Approach 2:
The patent combines the frame area with the touch detection functionality by integrating the second electrode into the cover base structure. The frame area, which was previously non-functional for touch detection, is merged with the touch detection system through the electrostatic capacitance sensing mechanism, allowing unified touch detection across both display and frame areas.
2Measurement precision
If second electrode is added in cover base for frame area touch detection, then touch detection accuracy in frame area is improved, but device complexity increases
Solution Approach 1:
The second electrode serves multiple functions: structural support as part of the cover base, electrostatic capacitance sensing for touch detection in the frame area, and signal transmission to the touch detection driver. This multi-functionality achieves improved touch detection accuracy without proportionally increasing device complexity.
Solution Approach 2:
The cover base structure itself is utilized to hold and position the second electrode, eliminating the need for separate electrode mounting structures. The existing cover base serves the additional function of electrode support, thereby reducing the need for extra components and simplifying the overall device architecture despite adding touch detection capability.
3Measurement precision
If level shifter is added between second electrode and touch detection driver, then signal level is increased for better detection, but device complexity increases
Solution Approach 1:
The level shifter acts as an intermediary component between the second electrode and the touch detection driver, converting the signal level to ensure proper detection. This mediator component enables reliable touch detection in the frame area by bridging the signal level mismatch, with the benefit of improved detection sensitivity outweighing the moderate increase in device complexity.
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
Enables comprehensive touch detection across both the display and frame areas, enhancing user interaction and improving touch detection accuracy and sensitivity in the frame area.
Implementation Method 1
detect contact or proximity to an object with the frame area based on electrostatic capacitance between the first electrodes and the second electrode
Data Source
AI summary
According to one embodiment, a display device includes first electrodes overlapping a display area, a cover base covering the display area and a frame area, a second electrode arranged in the cover base and overlapping the frame area, a touch detection driver configured to output a drive signal to the second electrode, and a level shifter arranged between the second electrode and the touch detection driver, and configured to increase a signal level of the drive signal and output the drive signal having the increased signal level to the second electrode. The touch detection driver is configured to detect contact or proximity to an object with the frame area based on electrostatic capacitance between the first electrodes and the second electrode.