Light Guide Module Layout for Thin Uniform Illumination
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Solution Overview
Problem
Existing light-emitting modules require a minimum thickness of 3.0 mm due to the need for a vertical distance of at least 6.0 mm from the LED to the light emergence surface or the use of high concentration diffusants, leading to hotspots and inefficiencies.
Innovation Solution
A light-emitting module design incorporating a light guide member with reflective and absorbing paint layers, reducing the stack thickness to less than 1.5 mm by optimizing light path projection and uniformity through reflective paint layers and absorbing paint layers, while maintaining brightness and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a vertical distance of at least 6.0 mm from LED to light emergence surface is maintained, then uniform light effect is achieved, but module thickness increases to at least 3.0 mm
Solution Approach 1:
The patent changes the light path from a direct vertical transmission to a reflected path through side surfaces. By making light travel horizontally along the light guide member and then reflecting off side surfaces with specific paint layers, the effective light propagation distance is extended without increasing the vertical thickness of the module.
Solution Approach 2:
The patent introduces reflective paint layers and light-absorbing paint layers as intermediaries on the side surfaces of the light guide member. These paint layers mediate the light propagation process by reflecting and absorbing light in controlled ways, enabling uniform light distribution while maintaining a compact thickness of less than 1.5 mm.
2Illumination intensity
If high concentration diffusant or diffusion powder is added to eliminate hotspots, then light uniformity improves, but light absorption increases and brightness decreases
Solution Approach 1:
The patent applies different paint layers with specific optical properties to different locations on the light guide member. Reflective paint layers are applied to certain side surfaces to redirect light, while light-absorbing paint layers are applied to other surfaces to prevent unwanted reflections. This localized application of different optical treatments achieves uniform light distribution without the need for high concentration diffusants that would absorb excessive light.
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 achieves a reduced module thickness, improved brightness and uniformity, and increased light utilization rate, with enhanced assembly ease and design flexibility.
Implementation Method 1
a first reflective paint layer is arranged on the first side surface
Implementation Method 2
a first light-absorbing paint layer is arranged on the first reflective paint layer
Data Source
AI summary
A light-emitting module includes a light guide member, a first reflective paint layer, a first light-absorbing paint layer, a circuit board, and a light-emitting unit. The light guide member includes a positioning surface, a first side surface, a second side surface, and a light emergence surface. The positioning surface includes a groove. The first reflective paint layer is arranged on the first side surface, and the first light-absorbing paint layer is arranged on the first reflective paint layer. The circuit board is located on the positioning surface. The light-emitting unit is arranged on the circuit board and is accommodated in the groove. In this way, the light-emitting unit on the circuit board may change a light path and project light to the light emergence surface, thereby reducing a required stack thickness of the light-emitting module.