Integrated Touch Display Electrode Layout for Fewer Touch Channels
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Solution Overview
Problem
Traditional touch display devices face challenges with increased complexity and cost due to the need for more touch electrodes, leading to a larger number of touch lines, touch pads, and touch channels, which complicates the panel structure and increases manufacturing costs.
Innovation Solution
A touch display device with an advanced touch sensor structure that integrates touch electrodes into a self-emission display panel, reducing the number of touch lines, pads, and channels while maintaining high touch resolution, and allowing for a simpler manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of touch electrodes is increased to achieve larger screen size or higher touch resolution, then touch sensing accuracy is improved, but the number of touch lines, touch pads, and touch channels increases causing device complexity to worsen
Solution Approach 1:
The patent merges the touch sensor structure with the display panel structure by integrating touch electrodes with display electrodes and sharing common conductive layers. This combining approach allows touch sensing functionality to be achieved without adding separate touch lines and pads, thereby improving touch sensing accuracy while avoiding increased structural complexity
Solution Approach 2:
The patent implements multi-functionality by designing electrodes that serve dual purposes: display functions and touch sensing functions. The same conductive layers and electrode structures are used for both displaying images and detecting touch inputs, eliminating the need for dedicated touch-specific components and reducing overall device complexity
2Measurement precision
If the number of touch electrodes is increased to achieve larger screen size or higher touch resolution, then touch sensing accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines touch sensor manufacturing with display panel manufacturing processes. By integrating touch electrodes with display electrodes and using shared material layers, the patent eliminates the need for separate touch panel fabrication steps, thereby reducing manufacturing complexity and cost while achieving high touch sensing accuracy
Solution Approach 2:
The patent achieves cost reduction through multi-functional electrode structures that perform both display and touch sensing functions. This approach eliminates the need for additional touch-specific materials and manufacturing steps, reducing overall manufacturing cost while maintaining high touch resolution
3Adaptability or versatility
If the number of touch channels is increased to support more touch electrodes, then touch sensing capability is improved, but the touch circuit becomes more complicated and size increases
Solution Approach 1:
The patent merges touch signal processing with display driving circuitry by sharing common signal lines and control logic. This integration allows multiple touch electrodes to be sensed through shared channels rather than requiring dedicated circuits for each electrode, improving touch sensing capability while keeping the circuit design simple and compact
Data Source
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AI summary
A touch display device (100) can include a substrate (SUB) having a display area (DA) and a non-display area (NDA) located outside of the display area (DA); at least one subpixel (SP) disposed in the display area (DA) including a display anode electrode (D_AND), an emission layer (EL) and a display cathode electrode (D_CTD); and a display driving transistor (DRT) disposed in the display area (DA) and being configured to drive the display anode electrode (D_AND). Also, the touch display device can include a touch electrode disposed in the display area (DA); a touch driving transistor (Ts11) disposed in the display area (DA) and configured to drive the touch electrode, the touch driving transistor (Ts11) including a first active layer (ACT1), a first source electrode (S1), a first drain electrode (D1) and a first gate electrode (G1); and a control transistor (Tc1) configured to control turn-on and turn-off operations of the touch driving transistor (Ts11), and including a second active layer (ACT2), a second source electrode (S2), a second drain electrode (D2) and a second gate electrode (G2).