See-through Display Light Guiding Plate Segmentation
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Solution Overview
Problem
See-through displays face challenges in maintaining high transparency and image clarity while being limited in installation location due to the need for an object to reflect light from the light guiding plate, which compromises pixel transmittance and image quality.
Innovation Solution
A display device with a first display panel, polarizing plates, and a light guiding plate that emits light towards the image display area and transmits ambient light for a transparent background, featuring a light-emitting area and a light-transmissive area, and optionally includes a scattering film or coating with a haze of 10% or less to control light distribution and prevent moire patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pixel transmittance is increased to achieve high transparency, then transparency is improved, but image clarity is compromised due to mixed display of image and background
Solution Approach 1:
The display panel is divided into two distinct regions: an image display area with liquid crystal pixels for displaying images, and a transparent display area without liquid crystal pixels for maintaining high transparency. This spatial segmentation allows each region to optimize its function without compromising the other.
Solution Approach 2:
Different regions of the display panel are assigned different optical properties: the image display area uses liquid crystal pixels with controlled transmittance for image clarity, while the transparent display area uses a transparent electrode layer with high transmittance for background visibility. Each local region has optimized quality for its specific function.
2Reliability
If light emitted by the light guiding plate is made less likely to escape toward the front side to achieve high transparency, then transparency is improved, but the location for installation is limited as an object to reflect light is required on the back side
Solution Approach 1:
The invention extracts and eliminates the requirement for an external light-reflecting object on the back side. Instead, a reflective layer is integrated directly into the light guiding plate structure, allowing the system to function as a stand-alone type display without external dependencies, thereby expanding installation flexibility.
Solution Approach 2:
The light guiding plate is designed with dual functionality: it serves as both a light guide for the backlight unit and as a substrate for the reflective layer. This multi-functionality eliminates the need for separate components and enables the display to operate independently without requiring specific installation conditions.
3Measurement precision
If a scattering film or coating is added to control light distribution and prevent moire patterns, then image quality is improved, but device complexity increases
Solution Approach 1:
The scattering function is merged into the existing light guiding plate structure by forming a scattering film or coating on its surface. This integration approach combines the light guiding function and the scattering function into a single component, avoiding the need for separate scattering elements and minimizing structural complexity.
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 enables high transparency and clear image display while reducing the bright-spot phenomenon and allowing flexible installation locations, as the light guiding plate's design ensures that ambient light is effectively utilized for background visibility without compromising image quality.
Implementation Method 1
a light guiding plate configured to emit incident light toward the first display panel and a light source attached to an edge of the light guiding plate
Implementation Method 2
the light-transmissive area transmitting ambient light incident from the back side therethrough toward the transparent display area
Implementation Method 3
a scattering film containing a scattering material and affixed to a front or back surface or a coating film formed of the scattering material on the front or back surface, the scattering material scattering incident light from the light source
Implementation Method 4
a first display panel configured to control a polarization direction of light on the basis of externally provided first image information
Data Source
AI summary
Provided is a display device serving as a see-through display which is capable of ensuring the clarity of a displayed image while maintaining high transparency and is less likely to be limited in terms of the location of installation.A dot-printed light-emitting area of a light guiding plate (60) emits, as backlight, light whose intensity is so high that the intensity of ambient light can be negligible, and therefore, the observer on the front side of a liquid crystal display device (10) is able to see a clear image displayed in an image display area (75) of a liquid crystal panel (20). Moreover, ambient light is transmitted through a light-transmissive area (72) of the light guiding plate (60) to be incident on a transparent display area of the liquid crystal panel (20), and therefore, the observer can see a background displayed with high transparency in the transparent display area (76).