Light Emitting Module With Integrated Diffusion And Wavelength Conversion
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Solution Overview
Problem
Existing light emitting modules face challenges in achieving uniform light emission characteristics with reduced luminance non-uniformity while maintaining a reduced thickness, as previous designs often fail to adequately disperse light from multiple light emitting elements, leading to applications with significant luminance and color non-uniformity issues.
Innovation Solution
A light emitting module comprising a light transmissive light guiding plate with recesses, a light adjustment portion including a wavelength conversion portion and a light diffusion portion, where the light emitting element is bonded to the light diffusion portion with the wavelength conversion portion interposed, allowing for uniform light emission and reduced thickness by positioning the light adjustment portion in the recess of the light guiding plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light diffusion member is disposed on the hemispherical lens member, then light diffusion is achieved, but the distance between the mounting substrate and the diffusion plate must be greater than the thickness of the lens member, resulting in increased overall thickness
Solution Approach 1:
The patent combines the light diffusion function and wavelength conversion function into a single integrated light diffusion member. This member contains both a light diffusion portion and a wavelength conversion portion, eliminating the need for separate components and reducing overall thickness while maintaining light diffusion uniformity.
Solution Approach 2:
The light diffusion member is designed to perform multiple functions simultaneously: it diffuses light to achieve uniform illumination and converts wavelength to adjust color temperature. This multi-functional design reduces the number of components needed and decreases the overall thickness of the light emitting module.
2Ease of manufacture
If a two-layer sheet integrating encapsulating resin and fluorescent material is bonded to the light emitting element, then encapsulation and wavelength conversion are achieved, but uniform light dispersion and irradiation from multiple light emitting elements cannot be achieved, resulting in luminance non-uniformity
Solution Approach 1:
The light diffusion member is positioned at a specific location (on the light emitting element) and has a specific structure (with light diffusion portion and wavelength conversion portion) that enables uniform light dispersion. This localized structural design ensures that light from multiple elements is uniformly dispersed without requiring complex integrated sheets.
3Length of stationary object
If the light emitting element is positioned close to the diffusion plate, then thickness is reduced, but sufficient light diffusion and uniformity cannot be achieved
Solution Approach 1:
By merging the light diffusion function and wavelength conversion function into a single member positioned close to the light emitting element, the patent achieves effective light diffusion and uniformity without requiring increased thickness. The integrated structure maximizes the efficiency of light interaction within a compact space.
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 effectively reduces luminance and color non-uniformity while achieving a thinner profile, enhancing the optical characteristics of the light emitting module by accurately positioning the wavelength conversion and light emitting elements, resulting in improved light emission characteristics for applications like liquid crystal display devices.
Implementation Method 1
The light adjustment portion includes a wavelength conversion portion and a light diffusion portion. The wavelength conversion portion is bonded to the light emitting element.
Implementation Method 2
The light diffusion portion is disposed on a bottom of the recess. The light diffusion portion has a wavelength conversion portion side on which the wavelength conversion portion is bonded.
Data Source
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AI summary
A light emitting module includes a light transmissive light guiding plate (1), a light adjustment portion (10), and a light emitting element (11). The light guiding plate (1) has a first main surface (1c) and a second main surface (1d) opposite to the first main surface (1c) and provided with a recess (1b). The light adjustment portion (10) is disposed in the recess (1b) of the light guiding plate (1). The light emitting element (11) is bonded to the light adjustment portion (10). The light adjustment portion (10) includes a wavelength conversion portion (12) and a light diffusion portion (13). The light diffusion portion (13) has a wavelength conversion portion side on which the wavelength conversion portion (12) is bonded. The light diffusion portion (13) is disposed on a bottom of the recess (1b). The wavelength conversion portion is bonded to the light emitting element (11).