Light Source Package with Directional Emission for Uniform Backlight
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Solution Overview
Problem
Backlight units for passive display devices face challenges in achieving uniform light irradiation across a large display area with a minimal number of light sources and optical parts, leading to insufficient beam spread angles and increased manufacturing costs.
Innovation Solution
A light source package comprising a first and second light source with distinct emission directions, combined with optical parts such as reflecting and diffusion sheets, and a heat transfer unit, to ensure comprehensive and uniform light distribution across a large display area with a reduced number of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the number of light sources and optical parts is reduced to minimize manufacturing cost, then manufacturing cost is reduced, but beam spread angles become insufficient to ensure uniform light irradiation
Solution Approach 1:
The patent divides the light source package into multiple functional modules: first and second light sources with different emission directions, first and second optical parts with specific functions (reflection and diffusion), and heat transfer units. This segmentation allows each component to be optimized independently while achieving uniform light distribution across the display panel with fewer total components.
Solution Approach 2:
The patent applies different optical characteristics to different regions: the first optical part reflects light from the first light source, while the second optical part diffuses light from the second light source. This local differentiation of optical functions enables comprehensive light coverage with minimal components, resolving the contradiction between component count and uniformity.
2Device complexity
If the number of light sources is reduced, then device complexity is reduced, but beam spread angles become insufficient to cover large display area
Solution Approach 1:
The patent utilizes different emission directions (first direction and second direction) for the two light sources, effectively using angular dimension to expand coverage. The first light source emits in a first direction while the second light source emits in a second direction different from the first, allowing the system to cover a larger display area with fewer light sources by exploiting directional diversity rather than increasing quantity.
Solution Approach 2:
The optical parts serve as intermediaries that modify and redirect light paths. The first optical part reflects light from the first light source, while the second optical part diffuses light from the second light source. These intermediary components extend the effective coverage area of each light source, enabling large display area illumination with minimal light sources.
3Manufacturing precision
If multiple light sources with different emission directions are used, then uniform light distribution is achieved, but device complexity increases
Solution Approach 1:
The patent combines multiple light sources and optical parts into an integrated light source package structure. The first and second light sources are positioned with specific relationships to the optical parts, and heat transfer units are integrated into the package. This merging approach achieves uniform light distribution while managing complexity through systematic integration rather than separate components.
Solution Approach 2:
The optical parts serve multiple functions: the first optical part both reflects light from the first light source and contributes to overall light distribution, while the second optical part diffuses light from the second light source. This multi-functionality reduces the need for additional specialized components, achieving uniform illumination without proportionally increasing device complexity.
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 substantial uniformity of light irradiation across a large display area while minimizing manufacturing costs by optimizing the placement and configuration of light sources and optical components, thus reducing the number of parts required in the backlight unit.
Implementation Method 1
a first optical part including a first surface that is configured to reflect at least a first portion of the first light
Implementation Method 2
a second optical part configured to spread the second light
Implementation Method 3
a reflecting sheet that reflects the first light reflected by the first surface of the first optical part
Implementation Method 4
a diffusion sheet disposed over the first and second light sources
Data Source
AI summary
A light source package includes a first light source configured to emit first light, an imaginary central axis of the first light extending in a first direction. The light source package may further include a second light source configured to emit second light, an imaginary central axis of the second light extending in a second direction that is different from the first direction. The light source package may further include a first optical part including a first surface that is configured to reflect at least a first portion of the first light. The light source package may further include a second optical part configured to spread the second light. The light source package may advantageously enable illuminating a desirably large display area with a minimum number of light sources and/or optical parts.