Touch Detection Electrodes Orthogonal to Display Scan Direction
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Solution Overview
Problem
Existing display apparatus with touch detection functions face challenges in minimizing the bezel width, particularly along the edge that intersects the display scan direction, due to the need for signal retrieval and circuit pattern routing, which increases the bezel width and complicates circuit layout.
Innovation Solution
The display apparatus incorporates a substrate with driving electrodes along the long side and touch detection electrodes along the short side, where the control unit drives the electrodes with pulsed touch signals during touch detection, using capacitive coupling to transmit signals, and includes a detection unit with an analog low pass filter, A/D converter, signal processor, and coordinate extractor to detect touch, while scanning directions differ between display and touch detection modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch detection electrodes are arranged to extend in the display scan direction, then touch detection function is achieved, but bezel width increases along the edge intersecting the scan direction
Solution Approach 1:
The patent inverts the conventional arrangement by making touch detection electrodes extend in the direction orthogonal to the display scan direction. This inversion allows touch detection signals to be retrieved from the opposite edge, reducing the bezel width requirement along the scan direction while maintaining full touch detection functionality across the display area.
Solution Approach 2:
The patent changes the dimensional orientation of touch detection electrodes from parallel to orthogonal relative to the display scan direction. This dimensional change enables signal retrieval from a different edge of the display, thereby reducing the bezel width along the original scan direction without compromising touch detection coverage.
2Measurement precision
If multiple touch detection electrodes are provided for signal retrieval, then touch detection accuracy is improved, but circuit pattern routing complexity increases
Solution Approach 1:
The patent inverts the signal retrieval approach by collecting touch detection signals from the edge orthogonal to the scan direction, rather than from the same edge as conventional designs. This inversion simplifies circuit routing by reducing the number of signal paths required and allowing more straightforward connection of multiple touch detection electrodes to the control circuit.
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 allows for reduced bezel width along the edge intersecting the display scan direction, simplifies circuit pattern routing, and enhances touch detection sensitivity without impairing image quality, enabling both display and touch detection operations during the same horizontal period.
Implementation Method 1
a capacitance is formed between the common electrode and the touch detection electrode, and this capacitance will change in response to an external proximate object
Data Source
AI summary
A display apparatus with a substrate having a long side and a short side, a plurality of driving electrodes arranged on the substrate parallel to the long side of the substrate, a plurality of touch detection electrodes arranged on the substrate parallel to the short side of the substrate, a control unit electrically coupled to each of the plurality of driving electrodes and which sequentially drives the plurality of driving electrodes, and a detection unit electrically coupled to each of the touch detection electrodes.