In-Cell Touch Panel Optical Laminate Thickness Reduction
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Solution Overview
Problem
In-cell liquid crystal display devices face challenges in reducing the thickness of the optical laminate while maintaining necessary functions and preventing the liquid crystal screen from becoming cloudy when touched.
Innovation Solution
An optical laminate for the front surface of an in-cell touch panel liquid crystal element is designed with a phase difference plate, polarizing film, and a transparent substrate with optical anisotropy, laminated without additional layers or only through a conductive layer, achieving a thickness range of 32 μm to 200 μm, which includes a conductive layer to prevent static electricity-induced cloudiness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple functional films and layers are attached through adhesion layers to ensure necessary functions, then the functionality is improved, but the thickness of the optical laminate increases
Solution Approach 1:
The patent combines multiple functional films (phase difference plate, polarizing film, protective film) and the conductive layer into a single integrated optical laminate structure. This merging eliminates the need for separate adhesion layers between each component, achieving thickness reduction while maintaining all necessary functions for the in-cell touch panel liquid crystal element
Solution Approach 2:
The optical laminate is designed as a multi-functional integrated component that simultaneously provides phase difference, polarization, protection, and static electricity prevention functions. This universal design allows a single laminate to replace multiple separate components, resolving the contradiction between functionality and thickness
2Length of stationary object
If the optical laminate thickness is reduced to improve device compactness, then the thickness is improved, but the liquid crystal screen becomes cloudy when touched
Solution Approach 1:
The patent introduces a conductive layer as an intermediary component within the optical laminate. This conductive layer serves as a mediator that prevents static electricity accumulation during touch operations, thereby preventing screen cloudiness while allowing the overall laminate thickness to be reduced through the integration of multiple functions
3Ease of manufacture
If additional adhesion layers are used to attach functional films, then the ease of manufacture is improved, but the thickness and device complexity increase
Solution Approach 1:
The patent merges multiple functional films and the conductive layer into a single integrated optical laminate that can be attached to the liquid crystal element as one unit. This reduces the number of lamination steps and adhesion layers required, simplifying the manufacturing process while reducing overall device complexity
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 effectively reduces the thickness of the optical laminate while ensuring necessary functions are maintained and preventing the liquid crystal screen from becoming cloudy, improving visibility and operational reliability.
Implementation Method 1
the transparent substrate has optical anisotropy that scatters linear polarized light emitted from the polarizing film
Data Source
AI summary
An optical laminate for a front surface of an in-cell touch panel liquid crystal element has reduced thickness while avoiding cloudiness of the liquid crystal screen. The optical laminate for a front surface of an in-cell touch panel liquid crystal element comprises a phase difference plate, a polarizing film, and a transparent substrate in this order, and further comprises a conductive layer. The transparent substrate has optical anisotropy that scatters linear polarized light emitted from the polarizing film, the phase difference plate, the polarizing film, and the transparent substrate are laminated without other layers or only through the conductive layer, and a thickness of the optical laminate is in a range of 32 μm to 300 μm.