Carbon Nanotube Touch Panel Integrated on LCD Substrate
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Solution Overview
Problem
Conventional display devices with touch panels attached using double-coated tapes result in increased volume and weight, compromising the visibility and reliability of the touch panel operation.
Innovation Solution
A display device design that integrates a single-touch capacitive touch panel with a liquid crystal display screen, utilizing a common substrate with a first transparent conductive layer and electrodes, and a second transparent conductive layer for the liquid crystal display, where the touch panel includes a carbon nanotube layer for enhanced light transmittance and conductivity, sharing the substrate with the liquid crystal display to achieve a thin, simple, and cost-effective structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional touch panel is attached to a conventional liquid crystal display through double-coated tapes, then the touch panel can be assembled, but the volume and weight of the display device increase
Solution Approach 1:
The patent merges the touch panel and liquid crystal display into a single integrated structure where the touch panel is formed directly on the liquid crystal display substrate. The common substrate serves both as the display base and touch sensing surface, eliminating the need for separate attachment through double-coated tapes and thereby reducing overall volume.
Solution Approach 2:
The common substrate performs multiple functions simultaneously: it serves as the structural base for the liquid crystal display, the sensing surface for touch detection, and the mounting platform for electrodes and conductive layers. This multi-functionality eliminates the need for separate components and attachment mechanisms.
2Ease of manufacture
If a conventional touch panel is attached to a conventional liquid crystal display through double-coated tapes, then the touch panel can be assembled, but the weight of the display device increases
Solution Approach 1:
The touch panel and liquid crystal display are combined into a single integrated structure sharing a common substrate, eliminating the weight of double-coated tapes and additional bonding materials while maintaining assembly capability through direct integration.
Solution Approach 2:
The patent discards the conventional double-coated tape attachment method and recovers the substrate itself as the integration medium, using the substrate's inherent structural properties to hold the touch panel and display together without additional weighting materials.
3Ease of operation
If a conventional touch panel is used, then touch operation is possible, but visibility and operational reliability are compromised
Solution Approach 1:
The patent changes the material parameters of the conductive layers from conventional opaque or semi-transparent materials to transparent conductive materials, improving light transmittance for better visibility while maintaining electrical conductivity for reliable touch operation. The carbon nanotube layer provides optimized electrical properties enhance operational reliability.
Solution Approach 2:
The patent uses composite material structures including transparent conductive layers and carbon nanotube layers that combine optical transparency with electrical conductivity, achieving both high visibility and reliable touch operation simultaneously.
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 integration of a carbon nanotube-based touch panel with a liquid crystal display screen reduces the overall volume and weight of the device while maintaining high visibility and reliability, offering improved operational accuracy and cost-effectiveness.
Implementation Method 1
a first transparent conductive layer and at least one first electrode and at least one second electrode electrically connected with the first transparent conductive layer
Implementation Method 2
a first transparent conductive layer and at least one first electrode and at least one second electrode electrically connected with the first transparent conductive layer
Implementation Method 3
Capacitive touch panels are widely applied because of the high accuracy and low cost of production
Data Source
AI summary
A display device includes a common substrate having a first surface and an opposite second surface, a first transparent conductive layer, at least one first electrode, and at least one second electrode. The first transparent conductive layer is positioned on the first surface. The at least one first electrode and the at least one second electrode are on the first surface and electrically connected to the first transparent conductive layer. The display device further includes a second transparent conductive layer, a first alignment layer, a liquid crystal layer, a second alignment layer, a thin film transistor panel, and a polarizer all stacked on each other in sequence along a direction from the first surface to the second surface of the common substrate. The second transparent conductive layer is positioned on the second surface of the common substrate.