Quantum Dot Backlight Unit for Adobe RGB Color Concordance
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Solution Overview
Problem
Conventional backlight units with multiple light-emitting diodes face challenges in achieving full-color images due to color stains and wide full-width half-maximum of light emission, which affects display quality.
Innovation Solution
A backlight unit incorporating a light source unit with quantum dots dispersed in a polymer resin, emitting white light by mixing blue, green, and red light, and an optical member with a prism sheet to control light, ensuring high concordance with the Adobe RGB color space for improved display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple light emitting diodes emitting lights with different colors are used, then full color image can be realized, but color stains occur on light guide plate
Solution Approach 1:
The patent segments the light source function by using a single blue light emitting diode combined with quantum dot sheets having different band gaps. Instead of using multiple LEDs of different colors, the system divides the color generation into separate quantum dot layers that convert blue light into different wavelengths, thereby avoiding color stains while achieving full color capability.
Solution Approach 2:
The patent introduces quantum dot sheets as intermediary materials between the blue light source and the final color output. These quantum dot sheets act as mediators that convert the blue light into different wavelengths (red, green, blue colors) through photoluminescence, eliminating the need for multiple colored LEDs and preventing color stains on the light guide plate.
2Area of stationary object
If full-width half-maximum of light emitted from each light emitting diode is wide, then light coverage is improved, but desired image quality cannot be realized
Solution Approach 1:
The patent applies local quality by using quantum dot sheets with specific band gaps positioned at different locations to generate different colors. Each quantum dot sheet has a narrow emission spectrum tailored to its specific function, providing precise color control while maintaining adequate light coverage through the light guide plate's optical design.
Solution Approach 2:
The patent changes the spectral parameters by using quantum dots with narrow full-width half-maximum values instead of conventional wide-spectrum LEDs. This parameter change enables precise color definition and sharp images while the light guide plate maintains broad area coverage through its light distribution capabilities.
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 enhances display quality by achieving a concordance ratio of over 99.9% with the Adobe RGB color space, providing sharper and clearer full-color images with narrower full-width half-maximum values for red and green lights.
Implementation Method 1
a quantum dot sheet configured to emit a second light having a different color from the first light
Implementation Method 2
an optical member that includes a prism sheet and is configured to control the light exiting from the light guide plate
Data Source
AI summary
A backlight unit includes a light source unit having a light source configured to emit a first light, a quantum dot sheet configured to emit a second light having a different color from the first light, a light guide plate configured to guide a light exiting from the light source unit or the quantum dot sheet, and an optical member including a prism sheet and configured to control the light exiting from the light guide plate. The quantum dot sheet includes a polymer resin and a plurality of first and second quantum dots, which are dispersed in the polymer resin. The second light is a white light obtained by mixing a red light, green light, and a blue light, and the second light has a concordance rate with an Adobe RGB color space which is no less than by about 99.9%.