LED Module with Fresnel Lens for Compact Flash and Sensor Integration
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Solution Overview
Problem
The miniaturization of camera components in mobile devices poses a challenge as existing flash LED and ambient light sensor configurations occupy valuable space, necessitating a compact design that integrates these components without compromising functionality.
Innovation Solution
A light emitting diode (LED) module is designed with a substrate, an LED package, an ambient light sensor, and a module cover made of transparent material, featuring a Fresnel lens that aligns vertically over the LED package and partially overlaps the light sensor, along with a reflective structure to inhibit side light emission and a roughened surface to prevent visual exposure, allowing for efficient light emission and ambient light detection within a limited footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a flash LED and ambient light sensor are mounted separately on the substrate, then both components can function independently, but the occupied space increases and miniaturization is compromised
Solution Approach 1:
The patent combines the flash LED and ambient light sensor into a single integrated module mounted on the substrate. The LED package includes both the light emitting region and the light receiving region in close proximity, allowing both components to function independently while occupying minimal space. This merging approach resolves the contradiction by achieving compact integration without sacrificing functional independence.
Solution Approach 2:
The integrated module design allows the same physical structure to serve multiple functions: the LED package simultaneously provides flash illumination through the light emitting region and ambient light sensing through the light receiving region. This multi-functionality enables both components to coexist in a compact form factor, addressing the space constraint while maintaining independent operational capabilities.
2Illumination intensity
If a lens is positioned to optimize LED light emission, then light distribution is improved, but the lens may interfere with ambient light sensor operation
Solution Approach 1:
The patent employs different optical characteristics in different regions of the module. The lens is positioned and designed with specific optical properties to optimize LED light emission in its local region, while the ambient light sensor is positioned in a region where it can receive ambient light without significant interference. This local differentiation allows optimal performance of both components without mutual interference.
Solution Approach 2:
The lens acts as an intermediary element that selectively manages light paths. It is designed to focus and distribute LED emitted light effectively while being positioned such that it does not block ambient light from reaching the sensor. The lens serves as a mediating optical element that enables both functions to coexist by managing light distribution in its local vicinity without interfering with the sensor's ambient light reception.
3Area of stationary object
If components are arranged to minimize footprint, then miniaturization is achieved, but component placement flexibility is reduced
Solution Approach 1:
The patent utilizes three-dimensional spatial arrangement to achieve compact integration. The LED package and ambient light sensor are positioned in close proximity on the substrate with optimized vertical and horizontal spacing. The lens is positioned above the LED package at a specific height to optimize light emission while maintaining adequate separation from the sensor. This multi-dimensional arrangement minimizes the overall footprint while preserving sufficient placement flexibility for both components to function effectively.
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
This configuration enables compact integration of flash LED and ambient light sensor functions within mobile devices, enhancing camera performance by allowing for image correction and light control based on ambient light information while maintaining a sleek aesthetic and efficient light distribution.
Implementation Method 1
a portion of the module cover includes a Fresnel lens vertically aligned over the light emitting region LED package and at least partially overlapping the light receiving region of the ambient light sensor
Implementation Method 2
The LED package includes an LED chip and a wavelength conversion film located over the LED chip
Implementation Method 3
a reflective structure having vertical reflective sidewalls surrounding the LED chip and wavelength conversion film to inhibit light emission from side surfaces of the LED chip and wavelength conversion film
Implementation Method 4
A lower surface of at least the lens of the module cover is roughened to form a visual impediment against viewing the LED package through the lens from outside the module cover
Data Source
AI summary
A light emitting diode (LED) module includes a substrate, an LED package, a light sensor and a lens. The LED package includes a light emitting region and is mounted on an upper surface of the substrate. The light sensor includes a light receiving region and is mounted on the upper surface of the substrate horizontally adjacent the LED package. The lens is vertically aligned over the light emitting region of the LED package and at least partially overlaps the light receiving region of the light sensor.