Integrated Electroluminescent Display Touch Panel Thickness Reduction
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Solution Overview
Problem
Conventional electroluminescent display touch panels are thick due to separate fabrication of display and touch panels, and they primarily support single-touch input, limiting their application to only basic functions like tapping, without supporting multiple-touch inputs such as dragging control.
Innovation Solution
The integration of touch input devices within the electroluminescent display panel by using a base substrate with both display and sensing regions, featuring a pixel switching device, readout device, and sensing pad, along with an encapsulating substrate that includes spacers and conductive layers to detect multiple touch inputs, reducing thickness and enabling multiple-touch functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the display panel and touch panel are fabricated separately and then assembled, then the manufacturing process is simpler and more flexible, but the overall thickness of the display touch panel increases significantly
Solution Approach 1:
The patent combines the display panel and touch panel into a single integrated structure where the touch sensing electrodes are formed on the same substrate as the display electrodes. This merging eliminates the need for separate fabrication and assembly processes, thereby reducing the overall panel thickness while maintaining manufacturing flexibility through a unified fabrication process
Solution Approach 2:
The patent implements multi-functionality by using the same transparent conductive oxide layers for both display electrode functions and touch sensing functions. The first and second transparent conductive oxide layers serve dual purposes as both display electrodes and touch sensing electrodes, eliminating the need for separate dedicated touch electrode layers and reducing overall panel thickness
2Ease of operation
If a conventional separate touch panel is used, then single-touch input function is achieved, but multiple-touch input function cannot be supported
Solution Approach 1:
The patent divides the touch sensing function into multiple independent sensing regions by creating multiple pairs of transparent conductive oxide layers (first and second layers, third and fourth layers) that can independently detect touch inputs at different locations. This segmentation enables the detection of multiple simultaneous touch points, supporting multiple-touch input functions while maintaining ease of operation
Solution Approach 2:
The patent extends the touch sensing capability from a single plane to multiple layers by forming touch sensing electrodes at different depths within the panel structure. The multiple pairs of transparent conductive oxide layers create stacked sensing planes that can independently detect touches, adding a vertical dimension to touch sensing and enabling multiple-touch support
Data Source
AI summary
An electroluminescent display touch panel includes a base substrate and an encapsulating substrate. The base substrate includes a pixel switching device, a readout device, an electroluminescent device, and a sensing pad. The pixel switching device and the electroluminescent device are disposed in a display region. The readout device and the sensing pad are disposed in a non-display region. The encapsulating substrate includes a first spacer, a sensing spacer, and a conductive layer. The first spacer is disposed on the surface of the encapsulating substrate facing the base substrate, maintaining a cell gap between the base substrate and the encapsulating substrate. The sensing spacer is disposed on the surface of the encapsulating substrate facing the base substrate and corresponding to the sensing pad. The conductive layer is formed on the surface of the sensing spacer facing the sensing pad.