In-Cell Touch Electrode Integration via Dielectric Layering
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Solution Overview
Problem
In-cell touch display apparatuses face challenges in integrating touch electrodes into the display panel while maintaining good display and touch performance, requiring innovative structural and electrical configurations to achieve high integration and minimal thickness.
Innovation Solution
The touch display apparatus comprises a first substrate, a second substrate, a display medium, pixel structures, touch electrodes, transistors, read-out lines, and scan lines, with specific electrical connections and layer arrangements to enable effective touch detection and display functionality, including the use of dielectric layers and insulating layers to facilitate electrical connections between touch electrodes and transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If touch electrodes are integrated into the display panel, then integration is improved and thickness is reduced, but display and touch performance may deteriorate
Solution Approach 1:
The touch electrode is integrated into the same plane as the pixel electrode rather than being stacked in separate layers. The touch electrode and pixel electrode share the same substrate plane, with the touch electrode positioned to overlap with the pixel electrode in the vertical projection, thereby achieving high integration without compromising display quality or touch sensitivity
Solution Approach 2:
A dielectric layer is introduced as an intermediary between the touch electrode and the transistor to enable electrical connection while maintaining physical separation. This dielectric layer with appropriate permittivity allows for effective capacitive coupling and signal transmission without direct contact, preserving both touch detection accuracy and display performance
Data Source
AI summary
A touch display apparatus comprises a first substrate, a second substrate, a display medium, pixel structures, touch structures and a dielectric layer. The outer surface of the first substrate is a touch surface. The plurality of pixel structures are arranged between the first substrate and the display medium or between the second substrate and the display medium. Each of the pixel structures comprises a data line, a first scan line, a first transistor and a pixel electrode. Each of the touch structures comprises a second transistor, a read-out line, a second scan line and a first touch electrode. The first touch electrode and the second transistor are arranged on an inner surface of the first substrate. The first touch electrode is arranged between the first substrate and the dielectric layer. The dielectric layer is arranged between the first touch electrode and a first transistor of a pixel structure.