In-Cell Touch Panel Scan Electrode Width Variation
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Solution Overview
Problem
In in-cell touch panels, the increasing number of leading scanning lines necessitates a larger frame region, which is undesirable for high-definition large screens in mobile information terminals, as it reduces the size of detection regions and increases the frame size, compromising detection accuracy and efficiency.
Innovation Solution
The implementation of an in-cell touch panel design where scanning electrodes of different widths are connected to a single leading scanning line, reducing the number of leading lines and frame size while maintaining detection accuracy by utilizing a pair of transparent substrates with scanning electrodes on one surface and detection electrodes on the opposing surface, allowing for efficient signal transmission and position detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of scanning electrodes and detection electrodes is increased to secure predetermined detection accuracy and increase detection region, then the detection accuracy and detection region are improved, but the number of leading lines increases and the frame region size increases
Solution Approach 1:
Multiple scanning electrodes (specifically two adjacent scanning electrodes in the Y-direction) are electrically connected to a single leading scanning line, merging their signal paths. This reduces the total number of leading scanning lines required while maintaining the ability to drive and read from all scanning electrodes, thereby reducing frame region size without compromising detection accuracy
Solution Approach 2:
A single leading scanning line serves multiple scanning electrodes simultaneously, making the leading line structure multi-functional. This universal connection approach allows one leading line to perform the function of what would traditionally require separate leading lines for each electrode, reducing overall system complexity
2Area of moving object
If the number of scanning electrodes and detection electrodes is increased to secure predetermined detection accuracy and increase detection region, then the detection region is increased, but the frame region size increases
Solution Approach 1:
By merging the connection paths of multiple scanning electrodes into shared leading lines, the physical space required for leading lines in the frame region is reduced. This allows the frame region to be minimized while the detection region can be maximized, as fewer leading lines occupy less space
3Reliability
If each scanning electrode is connected to a separate leading scanning line, then the scanning signal can be supplied to each electrode, but the number of leading lines increases and frame region size increases
Solution Approach 1:
Adjacent scanning electrodes that require the same scanning signal are merged into a single connection group served by one leading scanning line. This maintains reliable signal transmission to all electrodes while reducing the number of leading lines and associated frame region requirements
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 reduces the number and size of leading lines, enhances detection speed, and allows for accurate multi-touch input without compromising image quality, enabling smaller frame regions and increased detection area, thus improving user interaction speed and accuracy.
Implementation Method 1
capacitance touch panels are widely used mainly for mobile information terminals, since the capacitance touch panels have advantages in that multipoint input that is called multi-touch can be performed
Data Source
AI summary
A technique capable of reducing the number of leading lines and making the area of a frame region smaller is provided. A display device includes an in-cell touch panel in which a pair of transparent substrates is arranged so as to oppose each other, a plurality of scanning electrodes are disposed on an opposing surface of one of the transparent substrates, and detection electrodes that intersect with the scanning electrodes are arranged on an opposing surface of the other transparent substrate. The display device further includes at least one first leading lines electrically connected the scanning electrodes and configured to supply a scanning signal to the scanning electrodes, and at least one second leading lines electrically connected to the detection electrodes and configured to output a signal detected by the detection electrodes. In the display device, each of the first leading lines is connected to at least two of the scanning electrodes having different widths.