Light Emitting Module Recess Alignment for Thin Uniform Backlighting
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Solution Overview
Problem
Existing light emitting modules face challenges in achieving uniform light emission with minimal luminance non-uniformity while maintaining a reduced thickness, as they often require precise positional alignment of light emitting elements and wavelength conversion materials, which is difficult to achieve in direct backlighting liquid crystal display devices.
Innovation Solution
A light emitting module is manufactured using a light guiding plate with recesses and a light emitting element unit that includes a fluorescent material-containing light adjustment portion bonded to the plate, ensuring accurate positioning and reduced thickness through a light-transmissive bonding agent, allowing for efficient mass production and improved optical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If light emitting elements are mounted on a mounting substrate with hemispherical lens members, then light emission function is achieved, but the distance between mounting substrate and diffusion plate must be greater than lens member thickness, preventing sufficient thickness reduction
Solution Approach 1:
The patent merges the light emitting element mounting function and the light guiding function into a single integrated structure. The light guiding plate directly mounts the light emitting elements on its rear surface, eliminating the need for separate mounting substrates and hemispherical lens members, thereby reducing the overall module thickness while maintaining manufacturing feasibility
Solution Approach 2:
The patent extracts and removes the hemispherical lens members from the traditional structure, replacing them with a flat light guiding plate that has light guiding properties. This extraction eliminates the thickness constraint imposed by the lens members while preserving the light emission function through the light guiding plate's optical characteristics
2Length of moving object
If light emitting elements are mounted directly on light guiding plate, then thickness is reduced, but precise positional alignment of light emitting elements and wavelength conversion materials becomes difficult to achieve
Solution Approach 1:
The patent applies preliminary action by pre-forming recesses on the rear surface of the light guiding plate at precise positions before mounting the light emitting elements. These pre-positioned recesses serve as alignment guides that automatically ensure correct positional alignment during the mounting process, eliminating the need for complex alignment procedures while maintaining manufacturing precision
Solution Approach 2:
The recesses act as an intermediary structure that mediates between the light guiding plate and the light emitting elements. They provide a physical interface that ensures precise positioning and alignment, facilitating easy mounting while maintaining high positional accuracy without requiring complex alignment mechanisms
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 achieves uniform light emission with reduced luminance and color non-uniformity, enabling a thinner light emitting module design suitable for direct backlighting liquid crystal display devices with improved optical performance.
Implementation Method 1
a light adjustment portion containing a fluorescent material
Data Source
AI summary
The method of manufacturing a light emitting module includes: providing a light guiding plate having a first main surface serving as a light emitting surface; and a second main surface positioned opposite to the first main surface and provided with a recess; providing a light adjustment portion containing a fluorescent material; providing a light emitting element unit in which a light emitting element comprising an electrode is integrally bonded to the light adjustment portion; bonding the light adjustment portion of the light emitting element unit to the recess; and forming wiring on the electrode of the light emitting element.