Adjacent Touch Displays Noise Interference
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Solution Overview
Problem
Touch displays arranged next to each other experience noise interference from touch drive signals, affecting operational stability and accuracy in touch detection.
Innovation Solution
A display system configuration where the start and end timings of touch detection periods on one display overlap with the display periods of an adjacent display, preventing noise interference by not supplying touch drive signals during detection periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch detection is performed on adjacent display devices simultaneously, then touch detection coverage is complete, but noise interference occurs between the displays
Solution Approach 1:
The patent implements periodic touch detection by alternating between first display device and second display device in a cyclic manner. The control circuit sequentially performs touch detection on the first display device, then on the second display device, and repeats this cycle. This periodic action ensures that each display is detected when the other is not active, eliminating noise interference while maintaining complete touch detection coverage.
Solution Approach 2:
The control circuit performs preliminary coordination to manage the timing of touch detection operations. By pre-establishing the sequence where the first display device is detected before the second display device, and maintaining this timing relationship throughout operation, the system prevents noise interference from the second display's touch drive signals from affecting the first display's touch detection.
2Productivity
If touch drive signals are supplied to both displays simultaneously, then both displays are fully operational, but incorrect touch detections occur due to noise
Solution Approach 1:
The system employs periodic operation where touch drive signals are supplied to one display at a time in alternating cycles. During the period when the first display device is active, the control circuit suppresses touch drive signal supply to the second display device, and vice versa. This periodic isolation maintains display operational efficiency while preventing noise-induced incorrect touch detections.
Solution Approach 2:
The patent extracts the problematic simultaneous operation of both displays during touch detection periods. By separating the touch detection operations in time, the system removes the harmful interaction between the displays' touch drive signals and detection circuits, thereby eliminating incorrect touch detections while preserving overall system functionality.
3Object-affected harmful factors
If touch detection periods are staggered between adjacent displays, then noise interference is reduced, but detection timing coordination becomes complex
Solution Approach 1:
The control circuit implements a simple periodic cycle that alternates between detecting the first display device and the second display device. This regular periodic pattern creates a predictable timing coordination where each display is detected during specific intervals when the other is not active, effectively reducing noise interference without requiring complex timing management.
Solution Approach 2:
The control circuit establishes a predetermined timing sequence in advance where the first display device is detected before the second display device. This pre-planned timing coordination simplifies the control logic by maintaining a fixed pattern, thereby reducing noise interference while avoiding the complexity of dynamic timing adjustments.
Data Source
AI summary
In a display system, a second display device is disposed adjacent to a first display device. The first display device includes a first touch detection region adjacent to the second display device. The second display device includes a second touch detection region. A first frame period of the first display device includes a first display period for which the first display device displays an image and a first touch detection period for which a first touch detection circuit performs touch detection in a first touch detection region. A second frame period of the second display device includes a second display period for which the second display device displays an image and a second touch detection period for which a second touch detection circuit performs touch detection in a second touch detection region. Start and end timings of a first touch detection period overlap with a second display period.