Resin Layer Light Unit for LCD Uniformity
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Solution Overview
Problem
Conventional light units for LCDs face challenges in achieving thinness and uniform light distribution due to the thickness of the light guide plate and the reliance on metal-based optical patterns for light shielding, which can lead to non-uniform light emission and reduced reliability.
Innovation Solution
The proposed light unit eliminates the light guide plate and employs a film-type resin layer to diffuse and guide light, combined with a diffusion plate featuring an optical pattern that integrates diffusion and metal shielding patterns to achieve uniform light distribution and effective yellow-light shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light guide plate is used to provide uniform luminance, then light distribution is improved, but the thickness of the back-light unit increases
Solution Approach 1:
The patent removes the light guide plate from the back-light unit structure, extracting the component that causes thickness while maintaining its light-guiding function through alternative means (direct LED arrangement and optical sheets)
Solution Approach 2:
The patent uses thin optical sheets (diffusion sheet, prism sheet) to replace the bulky light guide plate, achieving the same light distribution function with significantly reduced thickness
2Illumination intensity
If a shielding pattern using Ag is used to prevent light concentration, then light distribution is improved, but light uniformity deteriorates because the patterned area is completely shielded
Solution Approach 1:
Instead of complete shielding in patterned areas, the patent applies local quality control by using diffusion patterns that selectively scatter light in different regions, creating gradual transitions rather than abrupt shielded zones
Solution Approach 2:
The patent combines multiple optical sheets (diffusion sheet with diffusion pattern, prism sheet) to create a composite structure that achieves both light distribution and uniformity through complementary optical effects
3Illumination intensity
If a diffusion sheet with shielding pattern is used to diffuse light, then light concentration is prevented, but yellow light from LED cannot be effectively shielded
Solution Approach 1:
The patent introduces a yellow light shielding layer as an intermediary component between the LED and the diffusion sheet, which selectively absorbs yellow light while allowing other wavelengths to pass through for diffusion
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 solution enables a thinner back-light unit with improved light uniformity and reliability, reducing the number of light sources and enhancing design flexibility, while effectively shielding yellow light to maintain high-quality image display.
Implementation Method 1
a resin layer stacked on the PCB to diffuse and guide emitted light forwards
Implementation Method 2
a diffusion plate having an optical pattern printed thereon to shield light emitted from the LED light sources
Implementation Method 3
a plurality of LED light sources formed on a PCB formed by stacking reflection films
Data Source
AI summary
Provided is a light unit including a plurality of LED light sources formed on a PCB, a resin layer stacked on the PCB to diffuse and guide emitted light forwards, and a diffusion plate having an optical pattern printed thereon to shield light emitted from the LED light sources. The optical pattern is composed of a diffusion pattern implemented as at least one layer, or a combination of the diffusion pattern layer and a light shielding pattern. The light unit forms an optical pattern for shielding or diffusing light on a surface of a light diffusion plate of the back-light unit, and combines a diffusion pattern and a metal pattern to attain uniformity of light and realize a yellow-light shielding effect, thus leading to a reliable light quality.