In-Cell Touch LCD with Large-TFT Substrate
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Solution Overview
Problem
Existing in-cell touch LCD devices face issues with increased weight and thickness, decreased light penetration, higher reflectivity, and haze ratio due to the use of high-resistance transparent conductive layers, which complicate manufacturing processes and reduce touch sensitivity and electrostatic discharge (ESD) performance.
Innovation Solution
A borderless in-cell touch LCD device configuration where the thin-film transistor substrate has a larger area than the color filter substrate, with a common electrode formed as a large-area plate and a nitride-based insulating layer, and a resistor added to the ground line of the printed circuit board for improved ESD paths, allowing for reduced manufacturing complexity and enhanced touch sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a high-resistance transparent conductive layer is used for touch sensing, then touch sensitivity is improved, but weight increases and thickness increases
Solution Approach 1:
The patent extracts and eliminates the high-resistance transparent conductive layer from the touch display structure. Instead of using this separate layer, the invention integrates touch sensing functionality directly into the liquid crystal layer and existing electrode structures, thereby removing the source of increased weight while maintaining touch sensitivity through alternative sensing mechanisms.
Solution Approach 2:
The patent merges the touch sensing function with the liquid crystal layer and existing electrode structures. By combining multiple functions (display and touch sensing) into a single integrated structure rather than using separate layers, the invention achieves touch sensitivity without the weight penalty of additional conductive materials.
2Ease of operation
If a high-resistance transparent conductive layer is used for touch sensing, then touch sensitivity is improved, but thickness increases
Solution Approach 1:
The patent removes the high-resistance transparent conductive layer that contributes to thickness. The touch sensing function is achieved through the liquid crystal layer itself and existing electrode configurations, eliminating the need for additional thickness-consuming layers while maintaining operational sensitivity.
Solution Approach 2:
By merging touch sensing functionality into the liquid crystal layer and existing electrode structures, the invention achieves multi-functionality without adding thickness. The same structural elements serve both display and touch sensing purposes, preventing thickness increase.
3Ease of operation
If a high-resistance transparent conductive layer is used for touch sensing, then touch sensitivity is improved, but light penetration ratio decreases
Solution Approach 1:
The patent extracts and removes the high-resistance transparent conductive layer that blocks light. By eliminating this layer, light penetration is improved while touch sensitivity is maintained through alternative sensing mechanisms using the liquid crystal layer and existing electrodes, which have minimal impact on optical properties.
Solution Approach 2:
The invention combines touch sensing with the liquid crystal layer, which is inherently transparent and does not compromise light penetration. This integration allows touch functionality to be achieved without introducing opaque or light-blocking materials.
4Ease of operation
If a high-resistance transparent conductive layer is used for touch sensing, then reflectivity increases, but manufacturing complexity increases
Solution Approach 1:
The patent removes the high-resistance transparent conductive layer that complicates manufacturing. By eliminating this separate layer, the number of manufacturing steps is reduced, and the process is simplified while touch sensitivity is maintained through integrated sensing in the liquid crystal layer and existing electrodes.
Solution Approach 2:
By merging touch sensing into the liquid crystal layer and existing electrode structures, the invention reduces the total number of components and manufacturing steps. This integration simplifies the manufacturing process compared to adding separate touch sensing layers.
5Ease of operation
If a high-resistance transparent conductive layer is used for touch sensing, then haze ratio increases, but manufacturing cost increases
Solution Approach 1:
The patent extracts and eliminates the high-resistance transparent conductive layer that increases manufacturing cost. By removing this layer, material costs and processing costs are reduced, while touch sensitivity is maintained through alternative integrated sensing mechanisms.
Solution Approach 2:
By combining touch sensing with existing components (liquid crystal layer and electrodes), the invention eliminates the need for additional expensive materials and processing steps, thereby reducing manufacturing cost while maintaining touch functionality.
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 simplifies manufacturing processes, reduces costs, and improves touch sensitivity and ESD performance by increasing finger capacitance and contact area, while eliminating the need for additional planarization layers and mask processes.
Implementation Method 1
a liquid crystal layer interposed between the upper substrate and the lower substrate
Implementation Method 2
a common electrode provided over the upper substrate, a gate line and a data line provided over the upper substrate and disposed to cross each other to define a pixel area, a touch line disposed over the upper substrate in parallel to the data line
Data Source
AI summary
An in-cell touch LCD device and a method of manufacturing the same are discussed. The in-cell touch LCD device may implement a screen display and a screen touch through a thin-film transistor substrate, which has an area larger than that of a color filter substrate, thus improving touch performance and ESD performance and simplifying a manufacturing process and reducing manufacturing costs.