Concave Groove PCB Light Source Assembly for Quantum Dot Backlight
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Solution Overview
Problem
Existing light source assemblies with quantum dot materials encapsulated in glass tubes suffer from increased thickness due to the placement of LED chips on printed circuit boards and encapsulating structures, leading to light loss as blue light is reflected by these structures before entering the glass tube, resulting in low optical efficiency.
Innovation Solution
A light source assembly design featuring a concave groove on the printed circuit board with the LED chip positioned inside, allowing the glass tube filled with quantum dots to be directly fixed within this groove, reducing overall thickness and minimizing light reflection losses by acting as an optical mixing cavity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the glass tube is placed above the LED chip in a conventional manner, then the quantum dot material can be protected, but the assembly thickness increases and light loss occurs due to reflection
Solution Approach 1:
The glass tube is nested into the concave groove formed on the printed circuit board, allowing the glass tube to be partially embedded rather than sitting on top. This nesting arrangement reduces the overall assembly thickness while still protecting the quantum dot material through the encapsulation provided by the glass tube structure.
Solution Approach 2:
Instead of placing the glass tube in a vertical arrangement above the LED chip, the concave groove introduces a horizontal dimension by etching into the PCB surface. This dimensional change allows the glass tube to be positioned at the same vertical level as the LED chip, reducing thickness while maintaining protective functionality.
2Reliability
If the glass tube is placed above the LED chip, then the quantum dot material is protected, but blue light is reflected by encapsulating structures resulting in low optical efficiency
Solution Approach 1:
By nesting the glass tube into the concave groove, the encapsulating structure is eliminated or minimized. The glass tube sits flush with or below the PCB surface, removing the reflective interface that would otherwise cause blue light loss and improve optical efficiency.
Solution Approach 2:
The concave groove structure converts the potential harm of light reflection into a benefit by using the groove walls as reflective surfaces that redirect light into the glass tube, thereby reducing light loss while maintaining the protective encapsulation.
3Length of stationary object
If the glass tube is accommodated in a concave groove on the printed circuit board, then assembly thickness is reduced, but structural complexity increases
Solution Approach 1:
The concave groove serves multiple functions simultaneously: it reduces assembly thickness, provides mechanical support for the glass tube, and eliminates the need for separate mounting structures. This multi-functionality reduces overall structural complexity despite the initial modification to the PCB.
Solution Approach 2:
The support structure and the PCB are merged into a single integrated component. The concave groove is formed directly in the PCB, combining the structural support function with the PCB itself, thereby reducing the number of separate parts and simplifying the overall assembly.
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 enhances optical efficiency by ensuring all emitted light from the LED chip enters the glass tube directly, reducing blue light absorption and improving light utilization, while maintaining structural integrity and stability with a thermally enduring plastic bracket.
Implementation Method 1
a glass tube in which a quantum dot material is filled
Data Source
AI summary
The disclosure discloses a light source assembly, a backlight module and a display device and relates to the field of display technologies, and the light source assembly includes a printed circuit board, an LED chip, and a glass tube in which a quantum dot material is filled, wherein a concave groove, on the bottom of which the LED chip is arranged, is arranged on the surface of the printed circuit board, a part or all of the glass tube is accommodated in the concave groove, and the glass tube is fixed in the concave groove.