Reflective Recess LED Module for Uniform Backlight Diffusion
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Solution Overview
Problem
Current direct type backlight modules for liquid crystal displays using LEDs face challenges in reducing thickness while maintaining uniform surface light diffusion, leading to increased costs and limited diffusion distance due to the strong positive light of LEDs.
Innovation Solution
A light source module comprising a substrate with light emitting diodes, an encapsulation layer, and reflection patterns in recesses on the light exit surface, which reflect light with smaller angles to avoid bright spots and enhance diffusion, allowing for a thinner design without increasing the number of LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the thickness of the backlight chamber is reduced, then the overall backlight module thickness is reduced, but the uniformity of the surface light source deteriorates
Solution Approach 1:
The invention segments the light diffusion function by introducing multiple light emitting diodes with different emission characteristics (first LED with first wavelength and second LED with second wavelength) and uses separate diffusion paths for each wavelength through the optical diffuser, allowing independent optimization of each wavelength's diffusion while maintaining overall uniformity in a thin chamber
Solution Approach 2:
The invention changes the optical parameters by using LEDs with different wavelengths (first wavelength and second wavelength) and designing the optical diffuser to have wavelength-dependent diffusion characteristics, enabling effective light diffusion in a reduced thickness while maintaining uniformity through spectral separation
2Stability of the object's composition
If more light-emitting diodes are disposed at the bottom of the backlight chamber, then the uniformity of the surface light source is improved, but the cost increases
Solution Approach 1:
The invention segments the light source into two types of LEDs with different wavelengths and uses an optical diffuser that selectively diffuses different wavelengths at different locations, achieving uniform illumination with fewer total LEDs by leveraging spectral diversity rather than relying solely on increased LED quantity
Solution Approach 2:
The invention changes from using identical LEDs to using LEDs with different wavelengths, and designs the optical diffuser to exploit these wavelength differences to create uniform illumination, replacing the need for increased LED quantity with wavelength-based optical control
3Speed
If optical lens is used to diffuse light, then the divergence angle is increased, but bright spots remain above the light-emitting diode
Solution Approach 1:
The invention segments the light diffusion process by using two different LEDs with different wavelengths and an optical diffuser that creates separate diffusion zones for each wavelength, preventing the formation of bright spots by ensuring that light from each LED is diffused in a controlled manner without overlapping concentration
Solution Approach 2:
The invention changes the approach from using a single LED type with optical lens to using two LED types with different wavelengths and an optical diffuser designed to create wavelength-specific diffusion patterns, fundamentally changing how light divergence is controlled to eliminate bright spots
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 a uniform surface light source with reduced thickness, effectively blurring bright spots and extending the diffusion distance, thus enabling thinner backlight modules with improved light distribution and reduced costs.
Implementation Method 1
the plurality of reflection patterns are respectively disposed in the plurality of reflecting recesses
Data Source
AI summary
A light source module includes a plurality of light emitting dies provided on a bearing surface of a substrate, an encapsulation layer covering the bearing surface and the light emitting dies, a plurality of reflecting recesses respectively formed opposite the plurality of light emitting dies on a light exit surface of the encapsulation layer and having a surrounding surface inclined relative to the light exit surface, and a plurality of reflection patterns respectively disposed in the plurality of reflecting recesses. A display panel might be coupled to the light emitting surface.