LED Light Guide Module for Uniform Line Lamp Output
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Solution Overview
Problem
Light emitting diodes (LEDs) in lighting applications suffer from hot spots and reduced light uniformity due to their high luminous intensity along the optical axis and non-uniform arrangement, which affects the design and performance of lamps, particularly in vehicles.
Innovation Solution
A lighting module design that includes a substrate with light sources, a light guide member, and a diffusion layer, where specific ratios and dimensions are optimized using the formula Uni_Min_0.7 = K1*(T/D) - K2*(B/A) + K3 to achieve at least 70% light uniformity, with K1, K2, and K3 being constants that satisfy certain conditions, ensuring improved light distribution and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple light emitting diodes are simply arranged, then the design freedom and productivity are improved, but the uniformity of light distribution deteriorates
Solution Approach 1:
A light guide member is introduced as an intermediary component between the LED array and the final light output. This light guide member includes a diffusion layer that redistributes the light from multiple LEDs, transforming the non-uniform light distribution into a uniform line-shaped beam. The light guide member acts as a mediator that decouples the LED arrangement from the light output pattern, allowing design freedom while maintaining light uniformity.
Solution Approach 2:
The light guide member incorporates a diffusion layer with specific local optical properties that vary across its structure. The diffusion layer has different refractive indices and scattering characteristics in different regions, allowing it to selectively redirect light from individual LEDs to create a uniform overall distribution. This local variation in optical properties enables the system to maintain both LED arrangement flexibility and light uniformity.
2Loss of energy
If light emitting diodes are used, then power consumption is reduced and life is extended, but hot spots occur due to highest luminous intensity in the optical axis direction
Solution Approach 1:
The light guide member with diffusion layer serves as an intermediary that redistributes the concentrated light from each LED's optical axis. Instead of allowing the intense axial light to create hot spots, the diffusion layer scatters and redirects this concentrated light laterally, blending it with light from adjacent LEDs and creating a uniform line-shaped beam without localized intensity peaks.
Solution Approach 2:
The invention transforms the light distribution from a point-source pattern (with intensity peaks along the optical axis) to a line-source pattern. By using the light guide member to extend the light distribution in the lateral dimension, the system converts the problematic one-dimensional axial intensity concentration into a two-dimensional uniform line distribution, eliminating hot spots while maintaining LED 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 provides improved luminance and uniform light distribution, enhancing the optical reliability and design flexibility of lighting modules and vehicle lamps by optimizing the pitch, cavity dimensions, and thickness ratios of the light guide member.
Implementation Method 1
a light guide member including a light guide portion sealing the plurality of light sources on the substrate and a diffusion layer disposed on the light guide portion
Implementation Method 2
a diffusion layer disposed on the light guide portion
Data Source
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AI summary
A lighting device disclosed in an embodiment of the invention comprises: a substrate; a plurality of light sources arranged on the substrate; and a light guide member including a light guide portion sealing the plurality of light sources on the substrate and a diffusion layer disposed on the light guide portion, wherein the plurality of light sources include a reflective body, a cavity concave on an upper surface of the reflective body, and a light emitting chip disposed on a bottom of the cavity, wherein 1/2 of the maximum width of the cavity is A, the height of the cavity is B, a pitch between adjacent light sources is D, a thickness of the light guide member is T, and a formula: Uni_Min_0.7=K1*(T/D) - K2*(B/A) + K3 is satisfied, wherein Uni_Min_0.7 represents a light uniformity of at least 70% on the light guide member and satisfies the condition of B < A, and K1, K2, and K3 are different constants having values greater than 0 and less than 1.