LED Projection Device Rectangular Light Pattern Uniformity
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Solution Overview
Problem
Conventional LED projection devices for cameras face challenges in uniformly illuminating the field of view due to circular light patterns, leading to uneven brightness and wasted lighting areas, and existing solutions like DIP LEDs and SMD modules require complex processing and unstable quality control.
Innovation Solution
An LED projection device with a substrate and LED packages that include a reflection surface and packaging lens, where the LED chip is disposed in the reflection surface and encapsulated by a symmetrical packaging lens, forming a non-circular light pattern by adjusting the size, displacement, and height of the LED chips and lenses to match the field of view, thereby achieving a substantially rectangular light pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a circular light pattern is used to illuminate the field of view, then the LED luminous efficacy is fully utilized, but the brightness uniformity deteriorates and dark areas are formed around the light pattern
Solution Approach 1:
The patent transforms the symmetric circular light pattern into an asymmetric rectangular light pattern by adjusting the LED chip position and using a rectangular projection lens. This asymmetric shape matches the rectangular field of view, eliminating dark areas and improving brightness uniformity while maintaining energy efficiency.
Solution Approach 2:
The patent changes the geometric parameters of the light pattern by adjusting the LED chip displacement and using a rectangular projection lens instead of a circular one. This parameter transformation converts the light distribution from circular to rectangular, solving the mismatch between light pattern and field of view.
2Illumination intensity
If only a part of the circular light pattern is used to light up the field of view, then the brightness uniformity improves, but the illumination efficiency deteriorates and wasted lighting area is formed
Solution Approach 1:
Instead of using a partial circular pattern, the patent employs a complete rectangular light pattern that matches the field of view shape. This rectangular asymmetry allows the entire light pattern to be utilized effectively, improving both brightness uniformity and illumination efficiency simultaneously.
3Illumination intensity
If multiple DIP LEDs are arranged circularly to fulfill illumination, then the field of view can be lit up, but the processing complexity increases and quality stability deteriorates
Solution Approach 1:
The patent merges multiple DIP LEDs into a single integrated LED module with a rectangular projection lens. This integration simplifies the structure from multiple separate components to one unified module, reducing processing complexity and improving quality stability while maintaining illumination capability.
Solution Approach 2:
The LED module integrates multiple functions: the LED chip provides light emission, the rectangular projection lens shapes the light pattern, and the housing provides structural support and heat dissipation. This multi-functional integration reduces the number of components and simplifies the overall system.
4Illumination intensity
If multiple SMD LED modules are tilted to project light in different directions, then the field of view illumination is achieved, but the device complexity increases and quality control becomes difficult
Solution Approach 1:
The patent uses a single LED module with an asymmetric rectangular projection lens that naturally directs light in the required pattern, eliminating the need for multiple tilted modules. This asymmetric optical design simplifies the configuration from multiple angled components to one straightforward module.
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 better uniformity in brightness and reduces dark areas around the light pattern, allowing for efficient illumination with a simpler manufacturing process and structure, while maintaining the LED's luminous efficacy.
Implementation Method 1
The at least one light beam that is emitted from the at least one LED chip of the LED package and passes through the packaging lens is refracted by the packaging lens and forms a non-circular light pattern
Data Source
AI summary
A light-emitting diode (LED) projection device for a camera has a substrate and at least one LED package mounted on the substrate. Each LED package includes a reflection surface, at least one LED chip disposed in the reflection surface, and a packaging lens encapsulating the at least one LED chip. By choosing a suitable amount of the LED chips that have suitable sizes and displacements and are encapsulated by suitable types of the packaging lenses, the light beams emitted from the LED chips can form a substantially rectangular light pattern that corresponds in shape to a field of view of the lens assembly. The brightness of the light pattern having better uniformity is formed and the dark area around the light pattern is reduced. The desired light pattern can be formed through simple manufacturing process and structure.