Reflective Sheet and Light Conversion Patches for Uniform LCD Backlighting
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Solution Overview
Problem
The miniaturization of light sources in display apparatuses leads to optical defects such as unevenness in luminance, which is a challenge in achieving a thin and uniform light distribution.
Innovation Solution
Incorporating a reflective sheet with holes to expose light sources, a diffuser plate to diffuse light, and an optical sheet with light conversion patches to improve luminance, which includes a light conversion sheet that can convert blue light into red and green light, a diffusion sheet to enhance uniformity, a prism sheet to direct light forward, and a reflective polarizing sheet to recycle light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If light sources are miniaturized and increased in number to reduce display apparatus thickness, then the thickness of the display apparatus is reduced, but optical defects such as luminance unevenness occur
Solution Approach 1:
The patent applies local quality by positioning light conversion patches at specific locations (edge regions) of the light source module rather than uniformly distributing them. This localized approach converts blue light to other wavelengths only where needed to compensate for edge luminance deficiency, thereby resolving the luminance unevenness caused by miniaturized light sources while maintaining the thin profile of the display apparatus
Solution Approach 2:
The patent utilizes parameter changes by employing light conversion patches that transform the wavelength parameters of light emitted by miniaturized blue light sources. By converting blue light to red and green light at edge regions, the system adjusts the spectral composition to achieve uniform luminance distribution across the display area, solving the optical defects introduced by light source miniaturization
2Manufacturing precision
If light conversion patches are added to improve luminance uniformity, then optical defects are suppressed, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the light conversion function into discrete patches positioned at specific locations rather than using a uniform light conversion layer across the entire module. This segmented approach achieves luminance uniformity through targeted light conversion while keeping the overall structure simpler than a comprehensive light conversion system would require
Solution Approach 2:
The light conversion patches act as intermediaries between the miniaturized blue light sources and the display panel. These patches mediate the optical interaction by converting wavelengths locally, thereby achieving luminance uniformity without requiring direct modification of the light sources or the display panel structure, thus minimizing overall device 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
This configuration effectively prevents or suppresses optical defects by enhancing luminance uniformity and efficiency, ensuring a uniform light distribution and improved display quality.
Implementation Method 1
a light conversion sheet that can convert blue light into red and green light
Implementation Method 2
a diffusion sheet to enhance uniformity
Implementation Method 3
a prism sheet to direct light forward
Implementation Method 4
a reflective polarizing sheet to recycle light
Implementation Method 5
a reflective polarizing sheet to recycle light
Data Source
AI summary
A display apparatus includes a liquid crystal panel; a plurality of light sources configured to emit blue light; a reflective sheet including a plurality of holes through which the plurality of light sources are exposed; a diffuser plate configured to diffuse the light emitted from the plurality of light sources; and an optical sheet configured to improve luminance of the light emitted from the plurality of light sources, wherein at least one of the diffuser plate or the optical sheet includes a plurality of light conversion patches.