Backlight Lens Array With Partition Walls for Collimated Uniform Light
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Solution Overview
Problem
Existing backlights using planarly arranged point light sources struggle to emit collimated light due to diffusive light from point sources, leading to overlapping irradiation ranges and difficulty in achieving uniform luminance.
Innovation Solution
A backlight design incorporating first and second lenses with specific shapes to reduce divergence angles, combined with a partition wall that blocks excess light, transforming the illumination area from circular to rectangular, enabling collimated light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple point light sources are planarly arranged to achieve surface light source, then the backlight can provide uniform illumination, but the diffusive light from point sources causes overlapping irradiation ranges making it difficult to achieve collimated light
Solution Approach 1:
The patent divides the optical system into multiple discrete lenses, each corresponding to a point light source. By segmenting the illumination into individual lens-controlled zones, the system can manage and control the diffusive light from each point source separately, ultimately achieving collimated light emission while maintaining uniform illumination across the surface.
Solution Approach 2:
The patent transitions from point光源 (0D) to planar arrangement (2D) of multiple point sources, and further to three-dimensional optical path control using lenses positioned at different heights. This dimensional transformation allows the system to achieve both uniform surface illumination and collimated light emission by controlling light propagation in multiple spatial dimensions.
2Area of stationary object
If adjacent irradiation ranges of point light sources overlap, then continuous surface illumination is achieved, but light enters neighboring lenses causing difficulty in achieving collimated light
Solution Approach 1:
The patent assigns specific irradiation zones to each lens, creating segmented control over the overlapping light fields. By defining clear boundaries and responsibilities for each lens-element pair, the system maintains continuous coverage while preventing cross-contamination of light between adjacent optical channels, thus achieving collimated emission.
Solution Approach 2:
The patent applies different optical properties to different regions of the system. Each lens is optimized for its specific zone, and the irradiation characteristics are locally adjusted to ensure that while ranges overlap for continuous coverage, the light quality and directionality are maintained for collimated emission in each local region.
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 design achieves collimated light emission by reducing divergence angles and preventing excess light from entering adjacent lenses, resulting in improved luminance uniformity and efficient light utilization.
Implementation Method 1
first lenses planarly arranged, overlapping with the respective light sources from above, and being of a shape enabling reduction of a divergence angle of the divergent light
Implementation Method 2
second lenses planarly arranged, overlapping with the first lenses from above, and being of a shape enabling further reduction of the divergence angle
Data Source
AI summary
A backlight includes: light sources planarly arranged and each capable of emitting divergent light; first lenses planarly arranged, overlapping with the respective light sources from above, and being of a shape enabling reduction of a divergence angle of the divergent light; second lenses planarly arranged, overlapping with the first lenses from above, and being of a shape enabling further reduction of the divergence angle; and a partition wall located between the first lenses and the second lenses, surrounding each of the first lenses, blocking part of the divergent light, and reducing an illumination area of the divergent light directed toward each of the second lenses.