Backlight Apparatus Quantum Dot Distribution
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Solution Overview
Problem
Current direct illumination type backlight apparatuses using quantum dots suffer from high costs and color deviation due to the excessive use of quantum dots and repeated light passage through the wavelength-converting device, leading to biased light colors.
Innovation Solution
A backlight apparatus design that uses a reduced amount of quantum dots by locally distributing them in hollowed regions within a filling material, with spacer layers and lens devices to minimize repeated light passage and color deviation, employing a combination of first and second quantum dots to blend light colors effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If quantum dots are uniformly distributed in the transparent intermediate layer, then the light color conversion is achieved, but the cost increases and color deviation occurs due to excessive quantum dot usage and repeated light passage
Solution Approach 1:
The patent divides the transparent intermediate layer into multiple sub-layers, with each sub-layer containing quantum dots of a specific size range. This segmentation allows for more precise control of light wavelength conversion, reducing the total quantum dot quantity needed while maintaining color accuracy and preventing color deviation.
Solution Approach 2:
The patent applies different quantum dot concentrations and size distributions to different regions of the transparent intermediate layer. By optimizing the quantum dot properties in each local region, the system achieves accurate color conversion with reduced overall quantum dot usage, eliminating the need for excessive uniform distribution.
2Illumination intensity
If quantum dots are used to improve display quality, then color gamut and color vividness are enhanced, but the cost of the backlight apparatus increases significantly
Solution Approach 1:
The patent systematically varies quantum dot parameters including size, concentration, and material composition across different sub-layers of the transparent intermediate layer. By optimizing these parameters, the system achieves high color quality with minimal quantum dot quantities, significantly reducing cost while maintaining enhanced color gamut and vividness.
Solution Approach 2:
The patent employs composite structures combining multiple types of quantum dots with different properties within the transparent intermediate layer. This composite approach enables efficient spectral coverage and color conversion, achieving high display quality with reduced material costs compared to using单一类型量子点.
3Use of energy by moving object
If light passes repeatedly through the wavelength-converting device, then the light extraction efficiency is improved, but color deviation occurs due to biased light color conversion
Solution Approach 1:
By segmenting the wavelength-converting layer into multiple sub-layers with specific quantum dot distributions, the patent enables controlled light conversion at each layer. This segmentation allows light to pass through multiple layers efficiently while maintaining accurate color conversion, preventing the color deviation that would result from repeated passage through a uniform layer.
Solution Approach 2:
The patent introduces optical films as intermediary elements between the light source and the wavelength-converting device. These intermediary films help control and optimize light passage, ensuring that repeated traversal through the quantum dot layer does not cause color deviation while maintaining high extraction efficiency.
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 reduces the overall cost and eliminates color deviation by ensuring minimal repeated light passage through the wavelength-converting device, maintaining accurate color rendition without the need for excessive quantum dot usage.
Implementation Method 1
The first quantum dots distributed in the filling material covering each first hollowed region absorb a first portion of the first color light passing through the filling material, and convert the absorbed first portion of the first color light into a second color light
Implementation Method 2
The second quantum dots distributed in the filling material covering each first hollowed region absorb a second portion of the first color light passing through the filling material, and convert the absorbed second portion of the first color light into a fourth color light
Implementation Method 3
Each semiconductor light-emitting device emits a first color light passing through the filling material covering the corresponding first hollowed region
Data Source
AI summary
The invention discloses a backlight apparatus including a wavelength-converting device and a light source. The wavelength-converting device includes a transparent upper barrier film, a transparent lower barrier film, a spacer layer, a filling material and a plurality of quantum dots. The spacer layer is bonded between the transparent upper barrier film and the transparent lower barrier film, and has a plurality of hollowed regions. The filling material covers the plurality of hollowed regions. The plurality of quantum dots are uniformly distributed in the filling material covering each hollowed region. The light source includes a circuit board and a plurality of semiconductor light-emitting device. The circuit board is disposed beneath the transparent lower barrier film. Each hollowed region corresponds to at least one semiconductor light-emitting device. Each semiconductor light-emitting device is electrically bonded on the circuit board, and locates beneath the corresponding hollowed region.