Cover Tape Lifting Detection in Display Devices
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Solution Overview
Problem
Display devices face challenges in reliably detecting the lifting phenomenon of a cover tape, which can lead to ghost touch phenomena and reduced touch member detection reliability.
Innovation Solution
A display device configuration that includes a substrate with a display area and a pad area, a touch member with touch electrodes, a driving chip, a circuit board with a conductive pattern and a test pad, and a cover tape with conductive layers. The driving chip detects the lifting phenomenon based on parasitic capacitance values transmitted through a transmission line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cover tape is used to protect the driving chip and circuit board, then protection and shielding are improved, but the lifting phenomenon of the cover tape cannot be detected reliably
Solution Approach 1:
The patent introduces a test pad and transmission line as intermediary elements between the driving chip and the cover tape. The test pad is disposed on the circuit board and electrically connected to the driving chip through a transmission line. When the cover tape lifts, the parasitic capacitance between the test pad and conductive pattern changes, and this change is transmitted through the transmission line to the driving chip for detection. This intermediary mechanism enables reliable detection of cover tape lifting while maintaining the protective function of the cover tape.
2Ease of repair
If the cover tape is lifted, then access to the driving chip and circuit board is improved for repair, but ghost touch phenomena occur and touch member detection reliability deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the driving chip continuously monitors the parasitic capacitance between the test pad and conductive pattern through the transmission line. When the cover tape lifts, the change in parasitic capacitance is detected and fed back to the driving chip, which can then identify the lifting phenomenon and prevent ghost touch phenomena. This feedback system ensures touch member detection reliability is maintained even when the cover tape condition changes.
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 effectively detects the lifting of the cover tape, preventing ghost touch phenomena and enhancing the reliability of touch member detection.
Implementation Method 1
The driving chip detects the lifting phenomenon based on parasitic capacitance values transmitted through a transmission line
Data Source
AI summary
A display device includes a substrate including a display area on which a plurality of pixels are disposed and a pad area disposed on a side of the display area, a touch member disposed on the substrate in the display area and including a plurality of touch electrodes, a driving chip disposed on the substrate in the pad area and configured to drive each of the plurality of pixels and the plurality of touch electrodes, a circuit board disposed on the substrate in the pad area and including a conductive pattern, which receives a reference voltage, and a cover tape disposed on the driving chip and the circuit board, and including a first conductive layer, which is electrically connected to the driving chip, and a second conductive layer which is disposed on the first conductive layer and is electrically connected to the conductive pattern.