Aerogel Light Guide Element for LCD Backlight Color Uniformity
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Solution Overview
Problem
Backlight assemblies for LCDs suffer from color differences due to the light source's inherent color variations and the light-absorbing function of conventional light guide plates, leading to 'cold screen' or 'warm screen' phenomena and uneven light distribution, resulting in bluing or yellowing images.
Innovation Solution
A light guide element with a scattering structure comprising aerogel particles of specific sizes (190 nm-620 nm) that scatter incident light uniformly, reducing color differences and enhancing light-emitting uniformity, and optionally incorporating luminous particles or a reflecting film to improve light utilization and chromaticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light guide plates are used to guide light from the light source, then light can be transmitted to the light-emitting surface, but color differences occur due to the light-absorbing function of the light guide plate material, resulting in uneven light distribution and bluing or yellowing images
Solution Approach 1:
The patent uses aerogel particles with a porous structure as the scattering structure in the light guide element. The porous nature of aerogel provides high scattering efficiency while maintaining light transmission, effectively scattering incident light to improve light-emitting uniformity without causing color differences. The porous material structure enables multiple light scattering events that redistribute light evenly across the light-emitting surface.
Solution Approach 2:
The patent optimizes the particle size of aerogel particles within a specific range (190 nm to 620 nm) to achieve optimal scattering performance. By controlling the particle size parameter, the scattering efficiency is maximized while minimizing color differences. The particle size is specifically tuned to scatter light effectively across the visible spectrum, preventing bluing or yellowing images.
2Loss of energy
If the light guide plate absorbs light to guide it, then light transmission is achieved, but the light-absorbing function causes color differences and reduces light utilization efficiency
Solution Approach 1:
The patent converts the light-absorbing property into a light-scattering function by using aerogel particles. Instead of light being absorbed and lost, the aerogel particles scatter the light, maintaining light utilization efficiency while achieving uniform light distribution. The scattering mechanism transforms potential energy loss into useful light redistribution.
Solution Approach 2:
The aerogel particles provide a porous scattering structure that efficiently redirects light without absorption losses. The porous structure creates multiple scattering interfaces that redistribute light evenly across the light-emitting surface, improving both light utilization efficiency and eliminating color differences caused by absorption.
3Object-generated harmful factors
If aerogel particles with smaller particle sizes are used to reduce color differences, then scattering efficiency improves, but the particle size may become too small to effectively scatter light
Solution Approach 1:
The patent establishes an optimal particle size range (190 nm to 620 nm) for aerogel particles that balances scattering efficiency and color difference reduction. Within this range, particles are large enough to effectively scatter light while small enough to scatter all wavelengths relatively uniformly, preventing color differences. The lower limit ensures sufficient scattering capability, while the upper limit prevents preferential scattering of specific wavelengths.
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 achieves stable and uniform white backlight, eliminating color differences and providing a thinner, lighter LCD design by scattering light effectively and compensating for wavelength imbalances, thus preventing bluing or yellowing images.
Implementation Method 1
By utilization of scattering function of the aerogel particles, the light guide element can improve the light-emitting uniformity and reduced and even completely eliminated the color difference
Data Source
AI summary
A light guide element, a manufacturing method thereof and a backlight assembly are provided. The light guide element includes: a scattering structure, including a plurality of aerogel particles, wherein the scattering structure includes a light incident surface and a light-emitting surface and is configured to receive incident light incident into the light incident surface and emit the incident light from the light-emitting surface, and a particle size of the aerogel particle is set according to a color difference of the incident light.