In-Cell Touch Control Assembly Using Conductive Photoresist
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Solution Overview
Problem
Traditional touch display devices with separate touch control screens are thick, have low transmission rates and contrast, and high manufacturing costs, and use environmentally harmful metal black matrices as conductive materials.
Innovation Solution
An In-Cell touch control assembly where one or two color resists (red, green, blue) become conductive photoresists by mixing organic compounds like PEDOT, functioning as touch control driving or sensing electrodes, reducing the assembly process and production costs while being more environmentally friendly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If separate touch control panel and liquid crystal display panel are manufactured and assembled independently, then the device structure is simple and manufacturing is easy, but the device becomes thicker and manufacturing cost increases
Solution Approach 1:
The patent merges the touch control panel and liquid crystal display panel into a single integrated structure. The touch control electrodes are formed directly on the color filter substrate during the liquid crystal panel manufacturing process, eliminating the need for separate touch panel assembly. This integration reduces device thickness while maintaining ease of manufacture through process consolidation.
Solution Approach 2:
The color filter substrate serves dual functions: as the base for the liquid crystal display and as the substrate for the touch control electrodes. The ITO layers serve both as transparent conductors for display and as touch control electrodes, achieving multi-functionality with single components.
2Adaptability or versatility
If separate touch control panel and liquid crystal display panel are assembled independently, then manufacturing flexibility is maintained, but transmission rate and contrast of the liquid crystal panel decrease
Solution Approach 1:
By integrating the touch control electrodes directly onto the color filter substrate during the liquid crystal panel manufacturing process, the patent eliminates additional glass and thin film layers that would otherwise be required for separate touch panel assembly. This reduces optical interference and maintains high transmission rate and contrast.
3Reliability
If separate touch control panel and liquid crystal display panel are manufactured independently, then functional separation is clear, but manufacturing cost increases and market competitiveness decreases
Solution Approach 1:
The patent consolidates the manufacturing process by forming touch control electrodes on the color filter substrate during the liquid crystal panel fabrication process. This integration eliminates the need for separate touch panel manufacturing and assembly operations, reducing manufacturing cost while maintaining functional integrity through proper electrode design and positioning.
4Reliability
If metal black matrix is used as conductive material for touch control electrodes, then conductivity is achieved, but environmental pollution occurs due to cadmium content
Solution Approach 1:
The patent changes the material parameter from metal black matrix containing cadmium to ITO (indium tin oxide), which is environmentally friendly. The ITO layers maintain the required conductive function while eliminating toxic cadmium content, thus resolving the environmental pollution issue without sacrificing electrical conductivity.
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 solution results in a thinner, cost-effective touch display with improved market competitiveness and reduced environmental impact by eliminating the need for metal black matrices, while maintaining effective touch control functionality.
Implementation Method 1
a conductive photoresist layer, and the conductive photoresist layer comprises repeatedly arranged conductive photoresists of three colors
Implementation Method 2
one or two of the color resists of three colors, red, green, blue are conductive photoresist, having conductive function to construct a single touch control driving electrode
Data Source
AI summary
The present invention provides an In-Cell touch control assembly, comprising a color filter substrate (1), a color resist layer (3) located at an inner surface of the color filter substrate (1), and the color resist layer (3) comprises repeatedly arranged color resists of three colors, red, green, blue, (R, G, B) and one or two of the color resists of three colors, red, green, blue (R, G, B) are conductive photoresist, having conductive function to construct a single touch control driving electrode (Tx), or a single touch control sensing electrode (Rx), or a touch control driving electrode (Tx) and a touch control sensing electrode (Rx). The In-Cell touch control assembly can lessen the touch control assembly process, and incorporate in the present liquid crystal panel process to reduce the production cost and raise the market competitiveness. Meanwhile, it is more environmental protective than prior art of utilizing the metal black matrix as being the touch control electrode.