Rear-View Mirror Optical Assembly for Directional LED Light Diffusion
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Solution Overview
Problem
Light emitting diodes (LEDs) used in vehicle lamps have limited directivity, leading to inefficient visual information provision to drivers and potential obstruction of other vehicles' views, necessitating an optical assembly that enhances luminous intensity, uniformity, and directional control of light emission.
Innovation Solution
An optical assembly with a housing featuring an inclined bottom surface and inner surfaces, housing a lighting module with a substrate and resin layer, which diffuses light and controls light exit direction and luminance values, minimizing light loss and ensuring effective illumination for drivers while reducing glare for other vehicles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If light emitting diodes are used as vehicle lamps, then power consumption is reduced and lifespan is extended, but light emitting area is insufficient
Solution Approach 1:
The patent transitions from point-source LED emission to surface light source emission by embedding LEDs within a light guide plate. This dimensional transformation allows light to be emitted across a distributed surface area rather than from a single point, effectively increasing the light emitting area while maintaining LED power efficiency
Solution Approach 2:
The light guide plate serves as an intermediary between the LED and the external environment. It receives concentrated light from the LED and redistributes it across a larger surface area, enabling the system to achieve both low power consumption and large effective emitting area
2Area of stationary object
If light emitting diodes emit light in various directions, then light coverage is increased, but visual information is not effectively provided to the driver
Solution Approach 1:
The patent implements directional control by structuring the light guide plate and housing to guide light preferentially toward the driver's position. Different regions of the light guide plate have optimized light extraction characteristics, ensuring that visual information is concentrated in the direction most useful for driver awareness rather than uniformly distributed
3Area of stationary object
If light emitting diodes emit light in various directions, then light coverage is increased, but light may obstruct the view of other vehicles
Solution Approach 1:
The housing and light guide plate are designed with asymmetric light extraction characteristics that concentrate light emission toward the driver's side while minimizing light emission toward adjacent vehicles. This localized directional control allows broad coverage for the intended recipient while reducing harmful glare for others
4Illumination intensity
If conventional lighting is used, then light emission in multiple directions occurs, but luminous intensity and uniformity are insufficient
Solution Approach 1:
The light guide plate acts as an intermediary that receives intense point-source light from the LED and transforms it into uniform surface light. The plate's optical properties and geometric structure ensure even light distribution across the emitting surface, achieving both high luminous intensity and uniformity simultaneously
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 optical assembly improves light uniformity and intensity, effectively guiding light towards the driver while minimizing glare for other vehicles, enhancing safety by optimizing light distribution and reducing visual obstruction.
Implementation Method 1
an upper surface of the resin layer emits by diffusing the emitted light from the light emitting device
Data Source
AI summary
The optical assembly disclosed in the embodiment includes a housing having an inclined bottom surface, a plurality of inner surfaces around an outer periphery of the bottom surface, and a receiving space in which an upper portion is opened; and a lighting module disposed on the inclined bottom surface, wherein the lighting module includes a substrate inclinedly disposed on the inclined bottom surface; at least one light emitting device disposed on the substrate; and a resin layer sealing the light emitting device and the substrate, wherein an upper surface of the resin layer emits light by diffusing light emitted from the light emitting device, wherein the plurality of inner surfaces includes a first inner surface adjacent to the light emitting device, a second inner surface facing the first inner surface, and third and fourth inner surfaces facing each other and disposed between the first and second inner surfaces, wherein a height between the bottom surface of the housing and an upper surface of the housing increases from the first inner surface toward the second inner surface, and decreases from the third inner surface toward the fourth inner surface.