Multi-Touch LCD Panel Conductive Colloid Integration
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Solution Overview
Problem
Conventional multi-touch LCD panels face issues with increased thickness and weight due to external touch sensing devices, and the manufacturing process can lead to climb breaking and cracking of the ITO electrode layer when forming protrusions for touch sensing components.
Innovation Solution
A method of manufacturing a multi-touch LCD panel by forming a touch sensing layer within the liquid crystal cell using a conductive colloidal mixture of particles and a colloid, which is coated onto the electrode layer of the counter substrate, eliminating the need for protrusions and thus preventing electrode layer cracking, and allowing for a streamlined and low-cost production process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an ITO dual panel is attached onto the LCD panel surface to achieve touch sensing function, then the touch sensing function is improved, but the thickness and weight of the panel increase
Solution Approach 1:
The patent combines the touch sensing function with the color filter substrate by integrating a conductive layer into the color filter manufacturing process. This merging eliminates the need for separate touch sensing devices, thereby reducing overall panel weight while maintaining touch sensing functionality.
Solution Approach 2:
The color filter substrate is given multiple functions: it serves both as the color filter layer and as the touch sensing component. The conductive layer formed on the color filter substrate enables touch sensing without requiring additional dedicated touch sensing layers, achieving multi-functionality in a single component.
2Reliability
If protrusions are formed on the color filter substrate to create touch connecting components, then the touch sensing capability is improved, but the ITO electrode layer experiences climb breaking and cracking
Solution Approach 1:
The patent removes the protrusion structure from the design. Instead of forming protrusions that cause mechanical stress and cracking, the solution uses a flat conductive layer formed directly on the color filter substrate, eliminating the source of climb breaking and cracking while preserving touch sensing capability.
Solution Approach 2:
The patent changes the structural parameters of the touch sensing component by replacing the protrusion-based design with a planar conductive layer design. This parameter change eliminates the taper angle and height issues that cause ITO layer cracking, while maintaining electrical connectivity for touch sensing.
3Shape
If an extra process of making protrusions is added before coating the ITO electrode layer, then the touch connecting component structure is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The conductive layer is formed on the color filter substrate during the conventional color filter manufacturing process, before the liquid crystal cell assembly. This preliminary action integrates the touch sensing layer formation into the existing manufacturing flow, eliminating the need for separate protrusion formation processes and reducing overall manufacturing complexity.
Solution Approach 2:
The patent merges the conductive layer formation process with the conventional color filter manufacturing process. By using the same manufacturing equipment and process steps to form both the color filter and the touch sensing conductive layer, the patent reduces the number of separate manufacturing processes needed, thereby lowering complexity and cost.
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 approach reduces the thickness and weight of the panel, improves product yield, and prevents electrode layer cracking, while meeting the 'small & light' requirements of modern electronics without altering the conventional color filter substrate manufacturing method.
Implementation Method 1
solidify the conductive colloidal mixture to make the conductive particles attach to the electrode layer and electrically connect to the electrode layer
Data Source
AI summary
A method of manufacturing a multi-touch LCD panel. A conductive colloidal mixture formed by mixing a plurality of conductive particles and a colloid is coated on the electrode layer of the counter substrate and is solidified to make the conductive particles electrically connect to the corresponding sensing electrodes of the array substrate. Consequently, when an external force is applied to one touching position on the counter substrate, the conductive particles electrically connect the sensing electrodes to the electrode layer and the touching signal of the position can be obtained. Due to the integration of the conductive particles into the liquid crystal cell gap, the multi-touch LCD panel has the advantages of slimness and lightness. Moreover, the manufacturing process of the conductive particles is introduced after the conventional counter substrate manufacturing method, and the objective of simple process, low cost and high yields can be achieved.