Backlight Reflector Geometry for Quantum Dot Resin Reduction
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Solution Overview
Problem
Existing display apparatuses with backlight units face challenges in reducing production costs and achieving high productivity, particularly in the use of quantum dot resin and the optical profile of the light source.
Innovation Solution
The display apparatus incorporates a backlight unit with a substrate, a light emitting diode, a quantum dot cover, a refractive cover, and a reflector. The refractive cover has a recessed portion with a reflector positioned above the quantum dot cover, and the reflector is designed to enhance the optical profile by adjusting the beam angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional backlight unit uses a large amount of quantum dot resin to achieve good color conversion, then the color quality is improved, but the production cost increases and productivity decreases
Solution Approach 1:
The patent changes the geometric parameters of the reflector (conical shape with specific height and base diameter ratios) and the recessed portion depth to optimize light reflection efficiency. This allows achieving good color conversion with reduced quantum dot resin amount, thus improving productivity while maintaining color quality.
Solution Approach 2:
The patent divides the backlight unit into distinct functional components: light emitting diodes for light generation, quantum dot resin for wavelength conversion, and a reflector with recessed portion for light direction control. This segmentation allows each component to be optimized independently, reducing the overall quantum dot resin requirement while maintaining performance.
2Ease of manufacture
If a conventional backlight unit uses a standard light source design, then the manufacturing is simple, but the beam angle is limited and optical profile is not optimized
Solution Approach 1:
The patent employs a conical reflector shape with curved surfaces to control and expand the beam angle of emitted light. The curved geometry naturally directs light rays to achieve a wider distribution pattern without complicating the manufacturing process, as the conical shape can be easily formed using standard molding techniques.
3Manufacturing precision
If quantum dot resin is extensively used to ensure wavelength conversion, then the color accuracy is improved, but the production cost increases
Solution Approach 1:
The patent extracts and concentrates the light reflection function into a dedicated reflector component with optimized geometry. This allows the quantum dot resin to be used more efficiently with smaller quantities, as the reflector directs light to maximize interaction with the reduced amount of quantum dot material, thereby maintaining wavelength conversion accuracy while reducing material cost.
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 reduces the amount of quantum dot resin used, lowers production costs, and achieves an optical profile with a great beam angle, improving the display's efficiency and image quality.
Implementation Method 1
a quantum dot cover covering the light emitting diode and configured to convert a wavelength of light emitted from the light emitting diode
Implementation Method 2
a refractive cover covering the quantum dot cover
Implementation Method 3
a reflector provided in the recessed portion to be positioned above the quantum dot cover
Data Source
AI summary
A display apparatus includes: a liquid crystal panel; and a backlight unit configured to provide light to the liquid crystal panel, wherein the backlight unit includes: a substrate; a light emitting diode provided on the substrate; a quantum dot cover covering the light emitting diode and configured to convert a wavelength of light emitted from the light emitting diode; a refractive cover covering the quantum dot cover, wherein a surface of the refractive cover has a recessed portion that is recessed toward the quantum dot cover and a reflector provided in the recessed portion to be positioned above the quantum dot cover, and wherein a diameter of a lower surface of the reflector is smaller than a diameter of an upper surface of the reflector.