Capacitive Touch-Sensing Device with Segmented Readout Lines
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Solution Overview
Problem
Conventional touch panels suffer from visual morie phenomena and deteriorated signal-noise ratios due to metal bridges, requiring higher electrical power and compromising sensitivity, especially in large-scale display applications.
Innovation Solution
A touch-sensing display panel with a capacitive touch-sensing device comprising select lines, readout lines, and capacitive touch-sensing units, each including a transistor with a gate electrode connected to select lines, a source electrode connected to a reference voltage, a drain electrode connected to readout lines, and a channel layer with a gate dielectric layer, where the touch-sensing pad is connected to the channel layer, allowing for transparent and sensitive touch detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal bridges are used to electrically connect touch-sensing pads at crossover positions, then electrical connection is achieved, but visual morie phenomenon occurs and transmittance is reduced
Solution Approach 1:
The patent extracts and removes the metal bridges from the touch-sensing circuit at crossover positions. Instead of using metal bridges to connect X-sensing and Y-sensing series, the invention eliminates these problematic components entirely, thereby eliminating the visual morie phenomenon and improving light transmittance while maintaining electrical connection functionality through alternative routing of the sensing series.
Solution Approach 2:
The patent replaces the metal bridge connection system with a reconfigured sensing circuit architecture. The X-sensing and Y-sensing series are routed to connect to touch-sensing pads through alternative paths that avoid physical crossover positions, substituting the mechanical metal bridge connection with a redesigned electrical pathway that eliminates optical interference.
2Ease of operation
If conventional X-sensing series and Y-sensing series with metal bridges are used, then touch sensing functionality is achieved, but signal-noise ratio deteriorates and sensitivity is reduced
Solution Approach 1:
The patent segments the touch-sensing circuit into distinct X-sensing series and Y-sensing series that are spatially separated and independently routed to different touch-sensing pads. This segmentation eliminates the interference caused by crossover positions where metal bridges previously connected the series, thereby improving signal-noise ratio and sensitivity while maintaining full touch sensing functionality.
3Reliability
If metal bridges are used at crossover positions, then electrical connection is achieved, but visual morie phenomenon occurs
Solution Approach 1:
The patent extracts and removes the metal bridges from the touch-sensing circuit at crossover positions. Instead of using metal bridges to connect X-sensing and Y-sensing series, the invention eliminates these problematic components entirely, thereby eliminating the visual morie phenomenon and improving light transmittance while maintaining electrical connection functionality through alternative routing of the sensing series.
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
The solution provides a transparent touch-sensing device with improved sensitivity and reduced electrical power consumption, eliminating visual morie phenomena and enhancing signal-noise ratios, enabling effective multi-touch capabilities with high transmittance.
Implementation Method 1
a gate dielectric layer located between the gate electrode and the channel layer
Implementation Method 2
capacitive touch-sensing units arranged in array. Each of the capacitive touch-sensing units comprises a transistor and a touch-sensing pad
Data Source
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AI summary
The present application provides a touch-sensing display panel (100) comprising a display panel (110) and a touch-sensing device (120) disposed above the display panel (110). The touch-sensing device (120) comprises a plurality of select lines (SL), a plurality of readout lines (RL) and a plurality of capacitive touch-sensing units (122) arranged in array. Each of the capacitive touch-sensing units (122) comprises a transistor (122a) and a touch-sensing pad (122b), each of the transistors (122a) comprises a gate electrode (G) electrically connected to one of the select lines (SL), a source electrode (S) electrically connected to a reference voltage (Vref), a drain electrode (D) electrically connected to one of the readout lines (RL), and a channel layer (CH) electrically coupled to the touch-sensing pad (122b).