Flat Lamp Structure Segmented Reflector Uniform Brightness
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Solution Overview
Problem
The existing flat lamp structures for vehicles require a large number of LEDs to achieve uniform surface light emission, leading to increased manufacturing costs.
Innovation Solution
A flat lamp structure with a combination of reflectors having different optical characteristics, including a specular reflection part and a Lambertian reflection part, along with an inner and outer lens, is used to diffuse and reflect light efficiently, reducing the number of LEDs needed while maintaining uniform brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a large number of LEDs are used to achieve uniform surface light emission, then the illumination uniformity is improved, but the manufacturing cost increases
Solution Approach 1:
The reflector is segmented into multiple regions with different optical characteristics (specular reflection regions and diffuse reflection regions). This segmentation allows each region to contribute differently to light distribution, achieving uniform surface illumination with fewer LEDs by optimizing the reflection pattern rather than simply increasing LED quantity
Solution Approach 2:
Different regions of the reflector are assigned different optical properties (specular vs. diffuse reflection) based on their local functional requirements. The specular reflection regions redirect light at specific angles while diffuse regions scatter light broadly, creating a complementary effect that achieves uniform illumination across the surface with reduced LED count
2Area of stationary object
If multiple LEDs are arranged at the border of the tail lamp, then the light emission coverage is improved, but the device complexity increases
Solution Approach 1:
The reflector acts as an intermediary between the LEDs and the target surface. By strategically designing the reflector's optical characteristics, it mediates the light distribution to achieve broad coverage without requiring LEDs to be positioned at every border location, thereby reducing arrangement complexity while maintaining coverage
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 improved reflection efficiency and uniform brightness across the entire surface using fewer LEDs, thereby reducing manufacturing costs and simplifying packaging.
Implementation Method 1
the reflector parts a and b have a specular reflection characteristic
Implementation Method 2
the reflector part c has a Lambertian reflection characteristic, and reflects the light in all directions with uniform brightness
Implementation Method 3
an inner lens which is disposed in front of the reflector with a predetermined interval to diffuse light emitted from the LED
Data Source
AI summary
A flat lamp structure may include a housing; a module in which at least one LED is disposed on a substrate; a reflector which reflects light emitted from the LED to the outside thereof; an inner lens which is disposed in front of the reflector with a predetermined interval to diffuse light emitted from the LED; and an outer lens which is disposed outside the inner lens and coupled to the housing, wherein the reflector has a first reflector part, a second reflector part, and a third reflector part having different optical properties and the first and second reflector parts have a specular reflection characteristic and the third reflector part has a Lambertian reflection characteristic, and reflects the light in all directions with the uniform brightness regardless of a direction to a diffuser surface to form a light emission surface.