Integrated Touch Display Structure for Thin In-Cell Sensing
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Solution Overview
Problem
The existing out-cell touch display devices have increased overall thickness due to separate touch sensing units, necessitating a solution to reduce thickness while integrating touch sensing functions into the display device.
Innovation Solution
A touch display device is designed with a substrate, conductive layers, a stacked structure, an inorganic light emitting unit, and a touch sensing circuit, where the conductive layers include gate and drain electrodes, and the sensing electrode is electrically connected to the touch sensing circuit, allowing for integrated touch sensing and display functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch sensing units are formed on an independent touch panel (out-cell structure), then touch sensing function is achieved, but the overall thickness of the touch display device is increased
Solution Approach 1:
The patent merges the touch sensing function and display function into a single integrated structure. The touch sensing electrode is formed within the display panel structure itself, combining what were previously separate touch panel and display panel components into one unified device, thereby reducing overall thickness while maintaining touch sensing capability
Solution Approach 2:
The display panel structure is designed to serve multiple functions simultaneously: it acts as both the display medium and the touch sensing substrate. The conductive layers and electrodes within the display structure perform dual roles in both light emission/display and touch signal detection, eliminating the need for a separate independent touch panel
2Reliability
If separate touch panel and display panel are used, then each component can be optimized independently, but process integration and production cost are increased
Solution Approach 1:
The manufacturing process merges the fabrication of touch sensing components and display components into a single integrated process flow. The same substrate, conductive layer deposition, and electrode formation processes are used to create both display and touch sensing elements simultaneously, reducing the number of separate manufacturing steps and improving process integration
Solution Approach 2:
The same manufacturing processes and materials are used to create components that serve multiple functions. The conductive layers are deposited and patterned to form both display electrodes and touch sensing electrodes in the same process sequence, eliminating the need for separate optimization and manufacturing lines for touch and display components
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 integration reduces the overall thickness of the touch display device, achieves process integration, and potentially lowers production costs while maintaining effective touch sensing and display operations.
Implementation Method 1
an inorganic light emitting unit, and a touch sensing circuit. The inorganic light emitting unit is disposed on the stacked structure
Data Source
AI summary
A touch display device is provided in this disclosure. The touch display device includes a substrate, a first conductive layer, a second conductive layer, a stacked structure, an inorganic light emitting unit, and a touch sensing circuit. The first conductive layer is disposed on the substrate. The first conductive layer includes a gate electrode. The second conductive layer is disposed on the first conductive layer. The second conductive layer includes a source electrode and a drain electrode. The stacked structure is disposed on the substrate. The stacked structure includes a conductive channel and a sensing electrode. The inorganic light emitting unit is disposed on the stacked structure. The inorganic light emitting unit is electrically connected with the drain electrode via the conductive channel. The touch sensing circuit is electrically connected with the sensing electrode.