Optical Laminate for In-Cell Touch Panel Display
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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, comprising a phase difference plate, a polarizing film, and a surface protective film with optical anisotropy, along with a conductive layer, optimizing the layer structure to scatter linear polarized light and reduce thickness to 90 μm to 450 μm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical laminate includes multiple functional films (phase difference plate, polarizing film, protective film, cover glass, 1/4 wavelength phase difference plate), then the necessary optical functions are ensured, but the thickness increases
Solution Approach 1:
The patent combines multiple functional films into a single integrated optical laminate structure. Specifically, the phase difference plate, polarizing film, protective film, and 1/4 wavelength phase difference plate are merged into one compact assembly with a total thickness of 90-450 μm, eliminating the need for separate stacked components while maintaining all necessary optical functions.
Solution Approach 2:
The patent employs thin film technology to achieve the required optical functions in a compressed thickness. The optical laminate uses carefully engineered thin films with specific optical properties (such as the 1/4 wavelength phase difference plate) that provide the necessary functionality while minimizing thickness, resulting in a compact structure suitable for in-cell touch panel integration.
2Length of stationary object
If the conductive member is removed from the operator side of the liquid crystal element, then the thickness is reduced, 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 structure. This conductive layer serves as a substitute for the traditional conductive member on the operator side, providing the necessary electrical functionality to prevent screen clouding during touch operations while maintaining the reduced thickness profile of the in-cell design.
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, enhancing the display's performance and usability.
Implementation Method 1
the surface protective film has optical anisotropy that scatters linear polarized light emitted from the polarizing film
Implementation Method 2
the surface protective film has optical anisotropy that scatters linear polarized light emitted from the polarizing film
Data Source
AI summary
Provided is an optical laminate for a front surface of an in-cell touch panel liquid crystal element in which the thickness can be reduced while necessary functions are ensured, and a liquid crystal screen becoming cloudy can be prevented.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 surface protective film in this order, and further comprises a conductive layer. The surface protective film has optical anisotropy that scatters linear polarized light emitted from the polarizing film, and a thickness of the optical laminate is in a range of 90 μm to 450 μm.