LED Package Concave Alignment for LCD Backlight Uniformity
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Solution Overview
Problem
Conventional semiconductor light emitting devices for LCD backlights face issues with uneven luminance distribution and reduced luminance efficiency due to the positional variations of light emitting elements, leading to gradients in directional characteristics and color mixing problems.
Innovation Solution
The semiconductor light emitting device features a package substrate with light emitting elements aligned on a linear line and spaced equally, using first and second concave portions to standardize distances and optical axes, ensuring uniform directional characteristics and improved luminance efficiency by aligning light beams with the optical waveguide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light emitting elements are mounted in a conventional concave portion with a round bottom, then the elements can be disposed at vertexes of a regular triangle or isosceles triangle, but it is impossible to mount all elements at the center of the concave portion, causing variations in distances to the sidewall and gradients in directional characteristics
Solution Approach 1:
The invention divides the single large concave portion into multiple smaller concave portions, each capable of holding one light emitting element at its center. This segmentation allows each element to be precisely positioned at the center of its own concave portion, eliminating the need to mount multiple elements at vertexes of a triangle and ensuring uniform distances to sidewalls for consistent directional characteristics.
Solution Approach 2:
Each small concave portion is designed with specific local geometry to hold a light emitting element at its center, creating localized optimal positioning conditions. This local quality approach ensures that each light emitting element has uniform directional characteristics relative to its own concave portion, while the overall arrangement of multiple such units achieves uniformity across the entire device.
2Adaptability or versatility
If light emitting elements are positioned at different distances from the sidewall of the concave portion, then mounting flexibility is improved, but luminance efficiency is reduced due to gradients in directional characteristics
Solution Approach 1:
By segmenting the concave portion into multiple smaller units, each element can be positioned at the center of its own unit with optimal distance to the sidewall. This eliminates the need to compromise positioning for multiple elements in a single large concave portion, maintaining maximum luminance efficiency while providing flexibility in the overall arrangement of multiple standardized units.
Solution Approach 2:
The invention creates equipotential conditions by ensuring that all light emitting elements are positioned at equivalent locations (centers of their respective concave portions) with uniform distances to sidewalls. This eliminates potential differences in directional characteristics and luminance efficiency that would arise from varying positions, ensuring all elements operate under identical optimal conditions.
3Device complexity
If multiple light emitting elements are arranged in a conventional configuration, then the device structure is simplified, but color mixing problems occur and luminance uniformity deteriorates
Solution Approach 1:
The invention segments the light emitting element arrangement into multiple independent units, each with its own concave portion. This segmentation prevents color mixing between adjacent elements by providing physical separation and standardized positioning, while maintaining luminance uniformity. The modular nature of the segmented structure actually simplifies the overall device design and manufacturing process.
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 enhances luminance efficiency and brightness by reducing gradients and ensuring consistent light projection onto the optical waveguide, improving the overall image display quality in LCDs.
Implementation Method 1
a plurality of light emitting elements 1; first concave portions 2 for storing the respective light emitting elements 1; and a second concave portion 6 for storing the first concave portions 2 and connecting members 4
Implementation Method 2
light reflection can be obtained in a package body 58
Implementation Method 3
an optical waveguide 77, the optical waveguide 77 being used for converting the light from dot emission to surface emission
Data Source
AI summary
A semiconductor light emitting device of the present invention includes a plurality of light emitting elements, a package body for storing the light emitting elements, wiring patterns being electrically connected to the light emitting elements, and Au wires for electrically connecting the light emitting elements and the wiring patterns, the package body including mounting concave portions for storing the respective light emitting elements, and storing concave portion for storing the mounting concave portions and the Au wires, the mounting concave portions being aligned on a linear line and spaced from each other with an equal pitch. In the above arrangement, as the semiconductor light emitting device of the present invention, it is possible to provide a semiconductor light emitting device having a high directional characteristic of emitted light, and a backlight device for a liquid crystal display, the backlight device using the semiconductor light emitting device and having an improved brightness of the emitted light.