Display Device Narrow Frame Touch Detection Noise Isolation
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Solution Overview
Problem
Conventional display devices with touch detection functions face challenges in narrowing the frame area around the display while maintaining accurate touch detection, as coupling noise from peripheral circuits and lines can degrade detection signal quality.
Innovation Solution
The display device incorporates a unique arrangement of drive electrodes, detection electrodes, and a scanner, with the scanner controlling switches to apply voltages for image display and touch detection, and the use of separate line groups and switch groups to manage video signals and drive signals, allowing for a narrower frame and improved touch detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If drive electrodes and detection electrodes are arranged in the display area with peripheral circuits and lines, then touch detection function is achieved, but coupling noise degrades detection signal quality
Solution Approach 1:
The patent divides the electrode arrangement into distinct regions: drive electrodes extend from the terminal area through the display area to the counter-terminal area, while detection electrodes are positioned specifically in the display area. This segmentation allows independent optimization of each electrode type's function and reduces interference between them.
Solution Approach 2:
The patent extracts the detection electrodes from the terminal area and positions them only in the display area, separating them from the peripheral circuits and lines that are concentrated in the terminal area. This extraction eliminates the coupling noise source while preserving touch detection capability.
2Area of stationary object
If frame area is narrowed to improve display device design, then device compactness is improved, but touch detection accuracy decreases due to noise from peripheral circuits
Solution Approach 1:
The detection electrodes are extracted from the terminal area where peripheral circuits and lines are located, and positioned only in the display area. This extraction removes the source of coupling noise that would otherwise contaminate detection signals, enabling accurate touch detection even with a narrowed frame area.
Solution Approach 2:
The drive electrodes serve as an intermediary element, extending continuously from the terminal area through the display area to the counter-terminal area. They provide a stable reference potential that mediates between the peripheral circuits in the terminal area and the detection electrodes in the display area, isolating the detection signals from noise.
3Area of stationary object
If drive electrodes extend from terminal area to counter-terminal area, then image display coverage is improved, but noise coupling to detection electrodes increases
Solution Approach 1:
The patent segments the electrode functions by having drive electrodes extend continuously from terminal to counter-terminal areas for full coverage, while detection electrodes are segmented to exist only in the display area. This segmentation allows the drive electrodes to provide broad coverage while the detection electrodes remain isolated from noise-prone terminal area circuits.
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 configuration enables a narrower display panel frame and enhances touch detection accuracy by preventing noise coupling and stabilizing the potential of drive electrodes and signal lines, thereby improving overall performance.
Implementation Method 1
detects a position of an object in proximity to the display area based on a detection signal from a detection electrode forming electrostatic capacitance between the detection electrode and the drive electrode
Data Source
AI summary
According to one embodiment, a display device comprises pixel electrodes formed in a display area, drive electrodes opposed to the pixel electrodes, first and second line groups formed in a non-display area, a first switch configured to apply a voltage for display or a drive signal to the drive electrodes, and a scanner configured to control the first switch. In the above structure, the first and second line groups are disposed with a space between the first line group and the second line group, and at least a part of the scanner is disposed in the space between the first line group and the second line group.