Capacitive Touch Panel Integrated with LCD Color Matrix
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Solution Overview
Problem
The integration of touch sensing devices with LCDs typically increases the size and weight of the display, and existing solutions do not efficiently integrate touch sensing functionality with the color matrix of LCDs without compromising display performance.
Innovation Solution
The integration of a dual functional touch sensing device with a color matrix in an LCD, featuring a first substrate with X and Y electrodes and a common electrode, where the touch sensing member is formed on the substrate with the color matrix, allowing for touch location detection while maintaining a thin and lightweight design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch sensing device is attached onto an LCD panel, then touch sensing functionality is achieved, but the size and weight of the display increase
Solution Approach 1:
The patent merges the touch sensing device with the LCD panel by integrating the touch sensor electrodes directly into the color matrix structure of the LCD. The X and Y electrodes are formed as part of the color matrix, eliminating the need for a separate attached touch sensor layer, thereby reducing overall device weight while maintaining touch sensing functionality.
Solution Approach 2:
The color matrix structure serves dual functions: it acts as both the display matrix and the touch sensing electrode structure. The X and Y electrodes that form the color matrix simultaneously function as touch sensor electrodes, allowing the same structural elements to perform both display and touch sensing operations.
2Adaptability or versatility
If a touch sensing device is attached onto an LCD panel, then touch sensing functionality is achieved, but the size of the display increases
Solution Approach 1:
The patent combines the touch sensing layers with the LCD panel structure by forming X and Y electrodes directly on the substrate as part of the color matrix. This integration eliminates additional layers that would increase the display's overall size, achieving touch sensing without compromising the compact dimensions of the LCD.
Solution Approach 2:
The patent utilizes the vertical dimension by forming electrodes on different layers of the substrate. The first X electrodes and first Y electrodes are formed on a first substrate, with subsequent electrodes formed on laterals of these initial electrodes, creating a three-dimensional integrated structure that reduces planar space requirements.
3Difficulty of detecting and measuring
If patterned electrodes are used in a capacitive touch device, then touch location detection is achieved, but the integration with color matrix becomes complex
Solution Approach 1:
The patent makes the color matrix electrodes serve dual purposes: they function as both the display matrix elements and the touch sensor electrodes. The X and Y electrodes that define the color matrix simultaneously detect touch locations through capacitive coupling, eliminating the need for separate electrode patterns and simplifying the overall integration.
Solution Approach 2:
The patent uses uniform transparent conductive material for both the color matrix electrodes and touch sensor electrodes. The first X electrodes, first Y electrodes, second X electrodes, and second Y electrodes are all formed using the same material deposition process, creating a homogeneous structure that simplifies manufacturing while enabling both display and touch sensing functions.
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 configuration enables effective touch location detection while reducing the size and weight of the LCD, enhancing light transmission and maintaining the functionality of the color matrix, thus addressing the inefficiencies of existing integration methods.
Implementation Method 1
a capacitive-type touch sensing device... uses patterned conductive layers (electrodes)... sensing the capacitance induced by a user's finger
Data Source
AI summary
The present invention relates to a liquid crystal display (LCD). The LCD includes a plurality of display units formed with a first substrate, a color matrix formed on the first substrate, and a common electrode formed on the color matrix, a second substrate spaced from the first substrate, a pixel electrode matrix formed on the second substrate, a liquid crystal material disposed between the common electrode and the pixel electrode matrix. The LCD includes a touch sensing member integrated onto the color matrix of the first substrate.