Touch Panel Liquid Crystal Layer for Privacy Protection
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Solution Overview
Problem
Conventional privacy protection films in touch display devices increase the thickness of the device, thereby reducing user experience due to their thickness and the potential for confidential information to be visible from wide angles.
Innovation Solution
A touch panel design incorporating a liquid crystal (LC) layer between a display module and a package cover plate, which adjusts the polarization and transmission direction of incident light to filter out larger angle light, achieving privacy protection without increasing device thickness, while maintaining luminance and color integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional privacy protection film is added to filter large-angle light, then privacy protection is improved, but the device thickness increases
Solution Approach 1:
The patent merges the privacy protection function with the existing display module by integrating a liquid crystal layer and polarizers into the display structure. This combination allows the display module itself to provide privacy protection without requiring an additional separate film layer, thereby preventing thickness increase.
Solution Approach 2:
The display module is designed to perform multiple functions: it serves as both the display component and the privacy protection mechanism. The liquid crystal layer and polarizers are integrated into the display module to enable it to filter large-angle light while maintaining its primary display function, eliminating the need for a separate privacy film.
2Loss of information
If a privacy protection film is added to reduce view angle, then confidential information protection is improved, but user experience deteriorates due to increased thickness
Solution Approach 1:
The privacy protection function is merged into the display module structure, combining the liquid crystal layer and polarizers with the existing display components. This integration protects confidential information while avoiding the thickness penalty that would degrade user experience.
Solution Approach 2:
The display module is designed to perform multiple functions simultaneously: displaying visual information and protecting confidential information through integrated liquid crystal and polarizer layers. This multi-functionality prevents the need for separate privacy films that would compromise user experience.
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 LC layer effectively filters out light with larger incident angles, providing privacy protection without enlarging the device thickness, and ensures minimal reduction in luminance and color distortion, thereby enhancing user experience.
Implementation Method 1
a first polarizer placed on a side of the display screen, which is close to the package cover plate
Implementation Method 2
A first liquid crystal (LC) is filled in the cavity; the first liquid crystal comprises a plurality of first liquid crystal molecules, and orthogonal projections of light axes of some of the first liquid crystal molecules intersect a polarization direction of the first polarizer
Implementation Method 3
the first liquid crystal comprises a plurality of first liquid crystal molecules, and orthogonal projections of light axes of some of the first liquid crystal molecules intersect a polarization direction of the first polarizer
Data Source
AI summary
A touch panel and a touch display device are provided. The touch panel includes a display module and a package cover plate. The display module includes a display screen and a first polarizer placed on a side of the display screen. A first frame glue is placed between the package cover plate and the display module, and the first frame glue, the package cover plate and the display module form a cavity. A first liquid crystal is filled in the cavity. The first liquid crystal includes a plurality of first liquid crystal molecules, and orthogonal projections of light axes of some of the first liquid crystal molecules intersect a polarization direction of the first polarizer.