Touch Display Device Periphery Sensing Accuracy
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Solution Overview
Problem
Existing touch display devices face challenges in achieving accurate touch sensing in the periphery area due to parasitic capacitance issues.
Innovation Solution
The implementation of a touch display device design that includes a display panel with touch electrodes overlapping subpixels, a touch power circuit generating pulse width modulated signals, and a gate driving circuit supplying scan signals. This design features a first line in the non-display area receiving a gate driving circuit control signal and a second line receiving a pulse width modulated signal, with the second line being wider than the first line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional touch display device structure is used, then the device can perform basic touch sensing, but the touch sensing accuracy in the periphery area deteriorates due to parasitic capacitance
Solution Approach 1:
The patent extracts and removes the harmful parasitic capacitance effect by introducing a guard electrode structure. The guard electrode is positioned between the touch electrode and the frame electrode, effectively separating and eliminating the parasitic capacitance path that degrades touch sensing accuracy in peripheral areas.
Solution Approach 2:
The patent introduces a guard electrode as an intermediary element between the touch electrode and frame electrode. This intermediary structure mediates the electrical field distribution and prevents direct parasitic capacitance coupling, thereby improving touch sensing accuracy without compromising the basic touch sensing function.
2Reliability
If the second line width is increased to improve signal transmission, then the signal transmission quality improves, but the non-display area space is reduced
Solution Approach 1:
The patent applies different line widths to different signal lines based on their specific requirements. The second line carrying the pulse width modulated signal is given a larger width for better signal transmission, while the first line carrying control signals maintains a standard width. This localized differentiation optimizes signal transmission quality where needed without unnecessarily consuming non-display area space.
Data Source
AI summary
A touch display device is disclosed that. has enhanced touch sensing accuracy in its periphery area. The touch display device comprises: a display panel including data lines, gate lines, subpixels, and touch electrodes that overlap a subpixel; a touch power circuit configured to generate and output a signal pulse width that is modulated; a gate driving circuit configured to supply a scan signal to the gate lines; a display controller configured to output a gate driving circuit control signal that controls controlling a driving timing of the gate driving circuit; a first line in a non-display area of the display panel that receives the gate driving circuit control signal; and a second line in the non-display area that receives the signal pulse width, wherein a width of the second line is larger than a width of the first line.