Directional LCD Viewing Films for Privacy and Light Efficiency
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Solution Overview
Problem
Existing liquid crystal display panels lack effective anti-peeping technology to adjust the visual angle and reduce light reflection, leading to potential overheating of components and reduced light-emitting efficiency.
Innovation Solution
Incorporating an absorptive polarizer, viewing control film, and light redirecting film to manage light angles and redirect light to a target region, while using absorptive polarizers to minimize ineffective light reflection and absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If light is not managed properly in the display device, then light-emitting efficiency is reduced, but components heat up due to absorbing light energy
Solution Approach 1:
The patent applies absorptive polarizers that convert harmful reflected light into beneficial absorbed energy. The polarizers are strategically positioned to absorb ineffective polarized light before it can cause heating in internal components, transforming the harmful effect of light reflection into controlled energy absorption at specific locations, thereby improving light-emitting efficiency while preventing unwanted heat buildup.
2Object-generated harmful factors
If visual angle is not controlled, then light reflection increases, but privacy protection is reduced
Solution Approach 1:
The patent implements viewing control films with spatially varying optical properties that create different viewing zones. The film structure includes regions with different polarization characteristics and light absorption properties, allowing the display to provide wide viewing angles in certain directions while maintaining privacy in others. This local differentiation of optical quality enables simultaneous achievement of reduced light reflection and controlled visual angle for privacy protection.
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
Enhances light-emitting efficiency by reducing light reflection and heat buildup, improving image brightness and quality, and providing adjustable visual angles for privacy.
Implementation Method 1
The absorptive polarizer can effectively absorb ineffective polarized light
Implementation Method 2
The viewing control film is between the backlight module and the liquid crystal display panel and configured to limit an angle of the light
Implementation Method 3
The light redirecting film is between the viewing control film and the liquid crystal display panel and configured to redirect the light from the viewing control film to a target region
Data Source
AI summary
A display device includes a backlight module, a liquid crystal display panel, a viewing control film, and a light redirecting film. The backlight module is configured to provide a light. The liquid crystal display panel includes a liquid crystal layer, a first polarizer at a first side of the liquid crystal layer facing the backlight module, and a second polarizer at a second side of the liquid crystal layer facing away from the backlight module. The first polarizer is an absorptive polarizer. The viewing control film is between the backlight module and the liquid crystal display panel and configured to limit an angle of the light. The light redirecting film is between the viewing control film and the liquid crystal display panel and configured to redirect the light from the viewing control film to a target region.