Discrete Wavelength Conversion Parts for LCD Backlight Uniformity
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Solution Overview
Problem
In LED backlight units for non-self-luminous displays like LCDs, the mixing of different wavelength conversion materials leads to non-uniform light emission, reduced energy efficiency, and color reproduction issues due to mutual interference and heat stability concerns, resulting in degradation of the light source over time.
Innovation Solution
The apparatus features a light source module with a first and second wavelength conversion part discretely arranged on the light path, minimizing mutual interference and heat exposure by converting light to specific wavelengths, and using optical sheets to refract or diffuse light, with the second conversion part positioned to emit light of a different wavelength than the first, enhancing energy efficiency and color reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If different wavelength conversion materials are mixedly used in a single packing part, then the manufacturing process is simplified, but uniform mixing ratio cannot be maintained and mutual interference occurs reducing energy efficiency
Solution Approach 1:
The patent divides the wavelength conversion function into separate parts by discretely arranging first and second wavelength conversion parts at different positions on the light path. This segmentation prevents mutual interference between different wavelength conversion materials while maintaining manufacturing simplicity, as each part can be independently optimized and positioned to convert light to specific wavelengths without absorbing each other's emitted light.
2Device complexity
If different wavelength conversion materials are mixedly used, then the device structure is simplified, but uniform white light emission cannot be achieved over the whole light emitting surface
Solution Approach 1:
The patent applies local quality by assigning different wavelength conversion parts to different locations on the light path. The first wavelength conversion part converts light to a first wavelength while the second wavelength conversion part converts light to a second wavelength, with each part optimized for its specific position. This spatial differentiation ensures uniform white light emission across the entire light emitting surface by preventing localized interference effects.
3Adaptability or versatility
If wavelength conversion materials with different heat stability are used together, then the color range is expanded, but the material with lower heat stability deteriorates sooner reducing color reproduction ratio
Solution Approach 1:
The patent segments the wavelength conversion materials into separate first and second wavelength conversion parts positioned at different locations on the light path. This segmentation allows materials with different heat stability characteristics to be used together without mutual interference, as each material operates in its own spatial zone. The broader color range is achieved through complementary wavelength conversions while reliability is maintained by preventing accelerated deterioration through isolation.
4Ease of manufacture
If adjacent wavelength conversion materials of different kinds are used, then the manufacturing cost is reduced, but absorption of emitted light occurs reducing the amount of emitted light
Solution Approach 1:
The patent extracts the wavelength conversion functions into separate, discretely arranged parts rather than mixing them together. By taking out the different wavelength conversion materials from a mixed configuration and placing them at different positions on the light path, the design eliminates mutual absorption while maintaining manufacturing cost efficiency. Each converted wavelength is emitted in a direction and location that minimizes re-absorption by other materials.
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 improves color reproductivity and delays material deterioration, maintaining high energy efficiency and reliability across various backlight unit designs, including edge-type and direct-type units.
Implementation Method 1
a first wavelength conversion part arranged on a light path from the light source module to an emitting surface of the light transmission member to convert a portion of the received light to a light of a predetermined wavelength and emit the light
Implementation Method 2
a second wavelength conversion part discretely arranged from the first wavelength conversion part on the light path to convert a portion of the received light to a light of a wavelength different from the wavelength of the first wavelength conversion part and emit the light
Implementation Method 3
an optical sheet to refract or diffuse a light by being arranged on an emitting surface of the light transmission member
Data Source
AI summary
An apparatus of light source for display for display according to an exemplary embodiment of the present disclosure may include a light source module configured to generate and emit a light, a light transmission member configured to decrease a luminous flux per unit area and emit the light, by receiving the light from the light source module, a first wavelength conversion part arranged on a light path from the light source module to an emitting surface of the light transmission member to convert a portion of the received light to a light of a predetermined wavelength and emit the light, and a second wavelength conversion part discretely arranged from the first wavelength conversion part on the light path to convert a portion of the received light to a light of a wavelength different from the wavelength of the first wavelength conversion part and emit the light.