Transparent Display Light Guide Plate Polarization Control
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Solution Overview
Problem
Current transparent display devices, such as organic light-emitting displays, face challenges in achieving high yield, large-sized displays, high reliability, wide viewing angle, high luminance, and high contrast ratio, especially when trying to maintain transparency and display images, due to their inability to spontaneously emit light and the need for non-transparent backlights and polarizing plates.
Innovation Solution
A transparent display device is designed with a light guide plate featuring a pattern on its upper surface to totally reflect light to an optical sheet, which then supplies the reflected light to a liquid crystal display panel, enhancing image quality by optimizing light polarization and transmission through the use of polarizing plates and optical sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polarizing plates are provided at both front and rear surfaces of the liquid crystal display panel to control light transmission, then image display capability is improved, but transparency is lost when liquid crystals are not driven
Solution Approach 1:
The patent extracts the light control function from the traditional backlight unit and relocates it to a light guide plate with integrated polarization control. The light guide plate selectively guides light based on liquid crystal driving state, extracting only the necessary light control functionality while eliminating the need for front and rear polarizing plates that block transparency.
Solution Approach 2:
The light guide plate serves multiple functions: it acts as a polarization controller, a light guide, and a transparency regulator simultaneously. This multi-functional component replaces the separate polarizing plates and backlight control mechanisms, enabling the display to switch between transparent and image display modes without additional components.
2Illumination intensity
If a non-transparent backlight unit is provided at the rear surface to enable image display, then image luminance is improved, but transparency of the display device is compromised
Solution Approach 1:
The patent applies local quality by creating region-specific optical properties within the light guide plate. Different regions of the light guide plate have different light guiding characteristics based on the liquid crystal driving state, allowing light to be directed locally to the liquid crystal panel when needed while maintaining overall transparency when not in use.
Solution Approach 2:
The system dynamically adjusts light transmission based on the liquid crystal driving state. The light guide plate transitions between transparent and light-guiding modes dynamically, allowing the display to switch between transparent and image display states without physical component changes or additional layers.
3Reliability
If polarizing plates are used to control light transmission for image display, then contrast ratio is improved, but light leakage in black mode occurs reducing transparency
Solution Approach 1:
The light guide plate acts as an intermediary between the light source and the liquid crystal panel. It mediates light transmission by selectively guiding light based on the liquid crystal driving state, preventing direct light leakage that would occur with traditional polarizing plate configurations while maintaining high contrast ratio.
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
This configuration reduces light leakage in black mode, significantly enhances contrast ratio and color gamut, and improves luminance, allowing for a transparent display that can show both rear objects and images effectively.
Implementation Method 1
a pattern is formed on an upper surface of a light guide plate to reflect all light entered into the light guide plate to an optical sheet disposed at a lower portion of the light guide plate
Implementation Method 2
a first polarizing plate to first-polarize the light emitted from the light source
Implementation Method 3
a first optical sheet at a lower portion of the light guide plate to reflect the first-polarized light received from the light guide plate
Data Source
AI summary
Disclosed is a transparent display device for enhancing image quality, and the transparent display device may include liquid crystal display panel; a light source disposed at one side of a lower portion of the liquid crystal display panel to emit light; a first polarizing plate to first-polarize the light emitted from the light source; a light guide plate at a lower portion of the liquid crystal display panel to receive the light first-polarized by the first polarizing plate through a lateral surface thereof, a pattern being formed on the upper surface of the light guide plate to output the incident first-polarized light in a lower direction of the light guide plate; a second polarizing plate at an upper portion of the liquid crystal display panel to control the amount of light transmitting the liquid crystal display panel; and a first optical sheet at a lower portion of the light guide plate to reflect the first-polarized light received from the light guide plate, and transmit a second polarization component of natural light received from the lower portion thereof.