Light Source Device with Reflective Top Cover for Uniform Illumination
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Solution Overview
Problem
Existing display device backlight modules face limitations in thinner design due to optical distance constraints, leading to issues with bright spots and uneven brightness, which are not effectively addressed by current edge-type and direct-type light source designs.
Innovation Solution
A light source device comprising a substrate, a light-emitting chip, a transparent sealant, and a top cover with high reflectance, where the transparent sealant covers the light-emitting chip and is clamped by the top cover, reducing forward light brightness and allowing for a shorter optical distance, thereby reducing the module's thickness and preventing excessive light concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a direct-type light source design is used to meet local dimming requirements, then illumination uniformity is improved, but optical distance constraints cause bright spots and affect module thickness
Solution Approach 1:
The patent introduces a reflector as an intermediary component between the light-emitting diode and the optical film. The reflector redirects light that would otherwise travel a long optical distance, effectively reducing the required optical distance while maintaining illumination uniformity and preventing bright spots
Solution Approach 2:
The patent changes the light propagation path from a primarily linear path to a multi-dimensional path by using the reflector to redirect light at different angles. This allows light to reach the optical film through alternative paths, reducing the effective optical distance required
2Illumination intensity
If primary and secondary optical design with external optical film is used to adjust light distribution, then light-emitting effect is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the functions of the reflector and the optical film into a more integrated structure. The reflector is positioned and shaped to work in conjunction with the optical film, reducing the need for separate complex optical components and simplifying the overall optical design
Solution Approach 2:
The reflector serves multiple functions: it redirects light to reduce optical distance, helps distribute light uniformly, and works with the optical film to achieve the desired light-emitting effect. This multi-functionality reduces the need for additional specialized components
3Illumination intensity
If optical distance is maintained to avoid bright spots, then illumination uniformity is improved, but module thickness increases affecting thinner design
Solution Approach 1:
The reflector acts as a mediator that enables uniform light distribution without requiring a large optical distance. By redirecting light paths, the reflector allows the module to achieve illumination uniformity while maintaining a thinner profile
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 effectively reduces relative brightness, improves light evenness, and allows for a thinner backlight module design, eliminating the need for external lenses and reducing manufacturing costs while preventing bright spots and uneven brightness.
Implementation Method 1
The reflectance of the top cover is greater than the transmittance of the top cover
Implementation Method 2
The transmittance of the top cover is greater than 0.1%
Data Source
AI summary
A light source device in the present invention includes a substrate, a light-emitting chip, a transparent sealant, and a top cover. The substrate has a supporting surface. The light-emitting chip is disposed on the supporting surface. The transparent sealant covers the light-emitting chip and is located on the supporting surface. The transparent sealant has a light-emitting surface located outside a side surface of the light-emitting chip. The top cover covers a side of the transparent sealant opposite to the substrate, and clamps the transparent sealant together with the substrate, and the light-emitting surface is located between the substrate and the top cover. A reflectance of the top cover is greater than a transmittance of the top cover, and the transmittance of the top cover is greater than 0.1%.