Transparent Display Device Using Polarization Modulation
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Solution Overview
Problem
Conventional liquid crystal display devices cannot simultaneously display images and allow transparent viewing of the background, making them unsuitable for applications like heads-up displays or information displays where both image display and background visibility are required.
Innovation Solution
A display device comprising a light source module, a first light modulation module, a first polarizer layer, and a first color modulation layer, where the light source module generates polarized light that can be modulated by the first light modulation module, and the first polarizer layer selectively blocks or allows this light to create a transparent viewing effect while displaying images, allowing background light to pass through for visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a conventional liquid crystal display device is used to display images, then image display function is achieved, but the device becomes opaque and background cannot be viewed
Solution Approach 1:
The display device is segmented into multiple functional layers: a light modulation layer with liquid crystal molecules, a first polarizer layer, and a second polarizer layer. Each layer performs a specific function in the light modulation process, allowing independent optimization of image display and background viewing capabilities without increasing overall structural complexity
Solution Approach 2:
The display device achieves multi-functionality by enabling both image display and background viewing through the same optical path. The polarizer layers and liquid crystal molecules work together to modulate light differently for forward viewing (image display) and backward viewing (background transparency), making the device universally applicable for both functions
2Loss of information
If the display device allows transparent viewing of the background, then background visibility is improved, but image display quality deteriorates
Solution Approach 1:
The invention changes the optical parameters of the light modulation layer by using specifically oriented liquid crystal molecules with controlled pitch lengths. By adjusting the pitch parameter and molecular orientation, the device can modulate light to maintain both background visibility and image brightness through differential phase modulation for different viewing directions
Solution Approach 2:
The display device uses a composite structure combining liquid crystal materials with specific polarizer layers. The liquid crystal layer with controlled pitch and molecular orientation works in conjunction with the polarizer layers to create a composite optical system that preserves both transparency and image quality by manipulating polarization states differently for forward and backward light paths
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
Enables users to see displayed images while simultaneously viewing the background, with adjustable transparency levels and improved image quality through controlled light modulation and transmittance properties.
Implementation Method 1
The light source module generates a first color light, emitting the first color light to the first light modulation module, wherein the first color light is a polarized light with a specific polarization direction or polarity
Implementation Method 2
The first modulation module may selectively modulate or not modulate the polarization direction of the first color light according to the input of an image signal
Implementation Method 3
The first polarizer layer, according to the polarization direction of the first color light passing through the first light modulation module, selectively blocks, partially blocks, or does not block the first color light
Data Source
AI summary
A display device includes a light source module, a first light modulation module, a first polarizer layer, and a first color modulation layer. The light source module generates a first color light that is polarized to the first light modulation module, wherein the first light modulation module selectively modulates the polarization direction of the first color light. The first polarizer layer then receives the first color light and selectively blocks, partially blocks, or does not block the first color light from passing through. The first color modulation layer receives the first color light and generates a second color light.