In-Cell Touch Display Using Metal Wire Sensing Electrodes
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Solution Overview
Problem
Conventional in-cell touch display panels require a transparent sensing electrode layer, increasing manufacturing costs, complicating the process, and reducing accuracy due to small capacitance between the sensing electrode and the finger, while also adding weight and thickness.
Innovation Solution
An in-cell touch display panel system using metal wires to connect sensing electrodes, eliminating the need for an additional transparent sensing electrode layer by integrating the sensing electrode layer with the common voltage layer, thereby reducing weight, thickness, and manufacturing costs, and enhancing sensing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transparent sensing electrode layer is added to the display panel, then touch sensing capability is achieved, but weight and thickness increase
Solution Approach 1:
The patent combines the sensing electrode function with the common electrode (Vcom) layer by integrating trace conductor lines into the Vcom layer structure. This merging eliminates the need for a separate transparent sensing electrode layer, thereby reducing panel weight while maintaining touch sensing capability through the integrated electrode system.
2Reliability
If a transparent sensing electrode layer is added to the display panel, then touch sensing capability is achieved, but thickness increases
Solution Approach 1:
The sensing electrode functionality is merged into the existing common electrode layer, eliminating the need for an additional transparent electrode layer. This integration reduces the overall panel thickness while preserving touch sensing capability through the trace conductor lines embedded in the Vcom layer.
3Reliability
If a transparent sensing electrode layer is added to the display panel, then touch sensing is enabled, but manufacturing cost increases
Solution Approach 1:
The patent integrates the sensing electrode function into the existing common electrode layer, eliminating the need to manufacture and assemble a separate transparent sensing electrode layer. This merging simplifies the manufacturing process and reduces material costs while maintaining full touch sensing functionality.
4Reliability
If a transparent sensing electrode layer is added to the display panel, then touch sensing is enabled, but light penetration rate decreases
Solution Approach 1:
By integrating the sensing function into the existing common electrode layer rather than adding a separate transparent electrode layer, the patent minimizes the additional optical path materials. This reduces light absorption and scattering, thereby maintaining higher light penetration rates while enabling touch sensing capability.
5Device complexity
If the distance between transparent sensing electrode layer and common electrode is very tiny, then in-cell integration is achieved, but capacitance between sensing electrode and finger becomes too small for accurate touch detection
Solution Approach 1:
The patent segments the electrode system into distinct functional components: the common electrode (Vcom) layer with integrated trace conductor lines for sensing, and the display electrode structures. This segmentation allows the sensing function to be performed by the trace conductor lines that can be positioned at optimal distances from the display surface, maintaining adequate capacitance for accurate touch detection while achieving in-cell integration.
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 solution decreases the weight and thickness of TFT touch LCD panels, lowers material and manufacturing costs, and improves touch sensing accuracy by eliminating the need for a separate sensing electrode layer and increasing light penetration.
Implementation Method 1
a liquid crystal layer configured between the first substrate and the second substrates
Implementation Method 2
a black matrix layer disposed on one surface of the first substrate facing the liquid crystal layer, the black matrix layer being composed of a plurality of opaque lines
Implementation Method 3
the capacitance formed by the finger and the transparent sensing electrode layer is much smaller than that formed by the transparent sensing electrode layer and the common electrode (Vcom) layer when performing touch sensing
Data Source
AI summary
An in-cell touch display panel system includes: first and second substrates configured therebetween a liquid crystal layer, a black matrix layer, a sensing electrode trace layer, an insulation layer, and a sensing electrode layer. The black matrix layer is composed of a plurality of opaque lines. The sensing electrode trace layer is composed of a plurality of trace conductor lines. The insulation layer is disposed on one surface of the sensing electrode trace layer facing the liquid crystal layer. The sensing electrode layer is composed of a plurality of transparent sensing electrodes obtained from patterning a common voltage layer. Each transparent sensing electrode is connected with at least one trace conductor line, while the plurality of trace conductor lines are disposed corresponding to positions of the plurality of opaque lines of the black matrix layer.