Lightguide Plate Recessed Portions for Thin Backlight Light Extraction
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Solution Overview
Problem
Existing light emitting modules face challenges in achieving a thin form factor due to the limitations in reducing the distance between the mounting substrate and the diffuser, making it difficult to achieve sufficient thickness reduction for thinner display devices.
Innovation Solution
A light emitting module design that includes a plurality of light emitting elements with wavelength conversion members, a resin member covering the wavelength conversion members, and a lightguide plate with recessed portions on its surface, allowing for efficient light distribution and extraction while minimizing the overall thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the distance between the mounting substrate and the diffuser is reduced to achieve thinner display devices, then the thickness of the backlight is reduced, but the light distribution and extraction efficiency deteriorate
Solution Approach 1:
The lightguide plate is designed with recessed portions at specific locations corresponding to the light emitting elements. These recessed portions create localized variations in the lightguide plate structure that enhance light extraction efficiency at critical points while maintaining an overall thin profile for the backlight assembly.
Solution Approach 2:
The recessed portions in the lightguide plate introduce curved surfaces that manipulate light propagation paths. The curved geometry of these recessed areas helps to redirect and distribute light more effectively across the display panel, improving light extraction without increasing the overall thickness.
2Length of stationary object
If the distance between the mounting substrate and the diffuser is reduced to achieve thinner display devices, then the thickness of the backlight is reduced, but the light extraction efficiency deteriorates
Solution Approach 1:
The lightguide plate incorporates recessed portions at specific locations to create localized optical enhancement zones. These recessed areas improve light extraction efficiency at critical points where light emitting elements are positioned, thereby reducing energy loss without requiring an increased overall thickness of the backlight assembly.
Solution Approach 2:
The curved surfaces formed by the recessed portions in the lightguide plate effectively manipulate light paths through refraction and reflection. This curved geometry enhances light extraction efficiency by redirecting trapped light modes, reducing energy loss while maintaining a compact thin-form-factor design.
3Illumination intensity
If conventional light emitting module structure is used with lens members and diffuser, then light distribution is achieved, but the overall thickness cannot be sufficiently reduced
Solution Approach 1:
The invention integrates the light distribution function directly into the lightguide plate structure through recessed portions, merging what were previously separate components (lens members and diffuser) into a single integrated lightguide plate. This consolidation achieves effective light distribution while significantly reducing the overall thickness of the backlight assembly.
Solution Approach 2:
The invention extracts and eliminates the separate lens members and diffuser components from the traditional multi-layer structure. By removing these discrete elements and incorporating their light manipulation functions directly into the lightguide plate via recessed portions, the overall thickness is substantially reduced while maintaining light distribution performance.
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 enables a thin light emitting module with improved light distribution and extraction efficiency, suitable for use as a backlight in liquid crystal display devices, while reducing manufacturing complexity and costs.
Implementation Method 1
a plurality of wavelength conversion members arranged respectively on the primary light emitting surfaces of the plurality of light emitting elements
Implementation Method 2
the lightguide plate includes a plurality of recessed portions on the second primary surface that are located over the plurality of wavelength conversion members
Data Source
AI summary
A light emitting module includes: a plurality of light emitting elements each having a primary light emitting surface; a plurality of wavelength conversion members arranged respectively on the primary light emitting surfaces of the plurality of light emitting elements; a resin member arranged between the plurality of wavelength conversion members and covering lateral surfaces of the plurality of wavelength conversion members; and a lightguide plate having a first primary surface and a second primary surface, and arranged on the resin member and the plurality of wavelength conversion members so that the second primary surface faces the resin member and the plurality of wavelength conversion members, wherein the lightguide plate includes a plurality of recessed portions on the second primary surface that are located over the plurality of wavelength conversion members.