Touch Electrode Concave Convex Structure for LCD Integration
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Solution Overview
Problem
The existing methods for integrating a touch sensor into liquid crystal display devices face challenges such as reduced manufacture efficiency, decreased yield, increased costs, and deterioration in image quality due to the difficulty in removing the liquid crystal orientation film and the potential for damage to electrodes under external pressure, leading to reliability issues and short-circuits.
Innovation Solution
A liquid crystal display device with a built-in touch sensor switch featuring touch electrodes on both substrates, where the first touch electrode is formed to cover a concave and convex area with grooves, and the liquid crystal orientation film is applied such that the top face of the convex part is exposed, allowing for efficient orientation and reducing the need for additional equipment and processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the liquid crystal orientation film is removed from the surface portion of the touch electrode using solvent spraying, then the touch electrode surface is exposed, but the manufacture efficiency deteriorates and yield decreases
Solution Approach 1:
The concave and convex area is formed on the touch electrode surface before applying the liquid crystal orientation film. This preliminary structural modification allows the orientation film to be automatically excluded from the convex part areas during the coating process, eliminating the need for subsequent removal operations while ensuring complete surface exposure where needed.
Solution Approach 2:
The touch electrode surface is differentiated into regions with different functions: concave areas that receive the liquid crystal orientation film for proper orientation, and convex areas that remain exposed for touch sensing functionality. This local differentiation achieves the desired exposure pattern without requiring uniform removal of the orientation film across the entire surface.
2Manufacturing precision
If the liquid crystal orientation film is removed from the touch electrode surface, then the touch electrode is exposed, but additional equipment and processes are required increasing manufacture cost
Solution Approach 1:
The concave and convex pattern is formed on the touch electrode before applying the liquid crystal orientation film. This preliminary action enables the orientation film to be automatically excluded from the convex areas during the coating process, eliminating the need for subsequent removal operations and additional equipment.
Solution Approach 2:
The concave and convex structure on the touch electrode surface serves itself by automatically defining the boundaries where the liquid crystal orientation film should and should not be applied. The geometry of the surface features themselves determines the final pattern, eliminating the need for separate masking or removal steps.
3Stability of the object's composition
If the touch electrode is made rigid to maintain structure, then structural stability is improved, but the electrode becomes susceptible to damage under external pressure
Solution Approach 1:
The touch electrode is designed as a thin film structure that can flex and deform under external pressure. This flexibility allows the electrode to maintain structural integrity while accommodating the mechanical stress of user interaction, preventing damage that would occur in rigid electrodes.
Solution Approach 2:
The touch electrode is designed to dynamically deform under external pressure to enable touch sensing functionality. This controlled deformation allows the electrode to adapt to user input while maintaining electrical connectivity and structural stability, resolving the contradiction between rigidity and durability.
4Manufacturing precision
If the touch electrode surface is fully covered with liquid crystal orientation film, then proper orientation is achieved, but the aperture ratio decreases reducing image brightness
Solution Approach 1:
The liquid crystal orientation film is selectively applied only to the concave areas of the touch electrode surface, while the convex areas remain exposed. This local differentiation ensures proper liquid crystal orientation where needed while maintaining the aperture ratio and image brightness in the touch electrode regions.
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 improves manufacture efficiency, yield, and image quality while reducing costs by ensuring reliable electrical connections and preventing short-circuits, maintaining the device's reliability and image brightness.
Implementation Method 1
a liquid crystal orientation film is provided in order to orient liquid crystal molecules in the liquid crystal payer
Implementation Method 2
when the liquid crystal panel is pressed and is deformed, the pair of touch electrodes are electrically connected to each other
Data Source
AI summary
A display device includes: a display panel including first and second substrates spaced from and opposite to each other, and has a touch sensor switch. The touch sensor switch includes a first touch electrode provided on a surface of the first substrate facing the second substrate, and a second touch electrode provided on a surface of the second substrate facing the first substrate and spaced from and faces the first touch electrode. The first and second touch electrodes contact with each other when the touch panel is deformed by an external pressure. The first touch electrode covers a surface of a concave and convex area where grooves are formed to be spaced from each other, and on the surface on which the first touch electrode is provided, an application film is provided to expose a surface of a top face of a convex part of the concave and convex area.