Light Guide Plate for Transparent Display Color Mixing Prevention
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Solution Overview
Problem
Conventional display devices with separated light amount controlling and color providing layers suffer from color mixing and blue light leakage, particularly when using near-ultraviolet or blue wavelength light sources, which affects transparency and image clarity, especially in transparent display devices.
Innovation Solution
The display device design includes a light guide plate with a specific configuration to direct light through pixels of the light amount controlling layer to adjacent pixels of the color providing layer, utilizing a combination of color conversion regions with phosphors or quantum dots and transparent regions to prevent color mixing and blue light leakage, while maintaining high transparency by eliminating the need for optical sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a light amount controlling layer and a color providing layer are separated using three sheets of substrates, then the display device can control luminance and color independently, but color mixing occurs because light passing through the light amount controlling layer may not be vertically incident to a pixel of the color providing layer
Solution Approach 1:
The patent introduces a light guide plate that redirects light in a lateral dimension rather than relying solely on vertical light incidence. The light guide plate receives light from the light source and guides it to be incident on the light amount controlling layer at angles other than vertical, thereby preventing color mixing while maintaining independent control of luminance and color through the separated layer structure
Solution Approach 2:
The light guide plate acts as an intermediary component between the light source and the light amount controlling layer. It mediates the light path by receiving light from the light source and redirecting it to be incident on the light amount controlling layer, ensuring that light does not directly pass through to adjacent pixels of the color providing layer, thus preventing color mixing
2Power
If near-ultraviolet light or blue wavelength light is used as a light source, then the display device achieves high luminance efficiency, but blue light leaks into adjacent red or green pixels
Solution Approach 1:
The light guide plate serves as an intermediary that redirects blue or near-ultraviolet light from the light source to be incident on the light amount controlling layer at controlled angles. This mediation prevents blue light from directly reaching adjacent red or green pixels of the color providing layer, thereby eliminating blue light leakage while maintaining the high luminance efficiency benefits of using blue wavelength light sources
3Illumination intensity
If a light guide plate with scattering patterns or optical sheets is provided, then light uniformity is improved, but transparency of the display device deteriorates due to light scattering
Solution Approach 1:
The patent applies different optical properties to different regions of the light guide plate. The light guide plate has a light incident portion with a first thickness and an opposing portion with a second thickness greater than the first, creating local variations in optical properties. This local quality differentiation allows light uniformity to be achieved in the opposing portion without compromising the transparency of the overall display device
Solution Approach 2:
The patent changes the thickness parameter of the light guide plate to optimize both light uniformity and transparency. By making the opposing portion thicker than the light incident portion, the patent achieves sufficient light diffusion for uniformity while maintaining overall device transparency, as the increased thickness is localized rather than uniform throughout the entire light guide plate
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 effectively prevents color mixing and blue light leakage, enhancing the transparency of transparent display devices by ensuring light is directed at appropriate angles and minimizing scattering, thus clearly showing objects behind the display.
Implementation Method 1
a light guide plate disposed below the first substrate, wherein the light guide plate guides the light from the light source to the first substrate
Implementation Method 2
the light guide plate is configured to allow light passed through a first pixel of the pixels of the light amount controlling layer to pass through a second pixel of the color providing layer
Implementation Method 3
each of the pixels of the color providing layer include a color conversion region, in which the light is converted and scattered
Implementation Method 4
the color providing layer may include a phosphor or a quantum dot
Data Source
AI summary
A display device including: first, second and third substrates, where the second substrate is between the first and third substrates; a light amount controlling layer between the first and second substrates; a color providing layer between the second and third substrates; a light source unit which provides light; and a light guide plate disposed below the first substrate, where the light guide plate guides the light from the light source to the first substrate, where the light amount controlling layer and the color providing layer include pixels corresponding to each other, light from the light guide plate and passed through a pixel of the light amount controlling layer to pass through an adjacent pixel of the color providing layer, and the pixels of the color providing layer include a color conversion region and a transparent region.