N-stage Light Source Module for Uniform Illumination
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Solution Overview
Problem
Conventional direct-type light source modules require a large number of LEDs, leading to increased cost and weight, especially as the module size grows, due to the need for uniform illumination across a larger area.
Innovation Solution
The design incorporates N-stage light sources with varying optical distances between each stage and an optical sheet, where the optical distance between consecutive stages decreases, allowing for a reduction in the number of light emitting elements by using a combination of mini LEDs and LEDs with secondary optical elements, and optimizing the pitch and optical distances to achieve homogeneous illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple LEDs with the same optical distance are arranged evenly on a backplane to provide homogeneous surface light, then the illumination uniformity is improved, but the number of LEDs increases, resulting in increased cost and weight
Solution Approach 1:
The patent applies local quality by dividing the light source into N-stage light sources with different optical distances from the optical sheet. Each stage uses LEDs with specific optical distances tailored to their position, creating locally optimized illumination that collectively achieves homogeneous surface light with fewer total LEDs
Solution Approach 2:
The patent changes the optical distance parameter of LEDs from a uniform value to multiple discrete values across different stages. By varying the optical distance parameter systematically from stage 1 to stage N, the patent reduces the total number of LEDs needed while maintaining illumination uniformity
2Area of stationary object
If the size of the direct-type light source module is increased, then the coverage area is improved, but the number of LEDs required increases, resulting in increased cost and weight
Solution Approach 1:
The patent introduces the optical distance dimension to organize LEDs into N stages at different distances from the optical sheet. This dimensional organization allows larger coverage areas to be achieved with fewer LEDs by utilizing the vertical spacing dimension rather than only horizontal arrangement
Solution Approach 2:
The patent segments the light source into N distinct stages, each with LEDs at specific optical distances. This segmentation allows the system to cover larger areas efficiently by distributing LEDs across multiple height levels rather than requiring dense horizontal placement
3Area of stationary object
If more LEDs are used to cover a larger area, then the illumination coverage is improved, but the weight of the light source module increases
Solution Approach 1:
By changing the optical distance parameter across N stages, the patent reduces the total LED count needed for large area coverage, directly reducing the weight of the light source module while maintaining adequate illumination coverage
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 approach reduces the total number of light emitting elements required, decreases the cost and weight of the light source module, and provides a slim visual effect while maintaining image homogeneity and reducing color shift.
Implementation Method 1
multiple light emitting diodes (LEDs) having a same optical distance are arranged evenly on a backplane
Implementation Method 2
an optical distance between an i-th-stage light source and the optical sheet is smaller than an optical distance between an i+1-th-stage light source and the optical sheet
Data Source
AI summary
A direct-type light source module including N-stage light sources and an optical sheet is provided. The optical sheet is disposed above the N-stage light sources, and an optical distance between the i-th-stage light source and the optical sheet is smaller than an optical distance between the i+1-th-stage light source and the optical sheet, where 1≤i<N, and N is a positive integer greater than 1. A display device is also provided.