Lightguide Plate Protrusions for Uniform Luminance
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Solution Overview
Problem
Existing light emitting modules face challenges in reducing thickness while maintaining uniform luminance, leading to unevenness in light emission.
Innovation Solution
A light emitting module design featuring a lightguide plate with a first hole serving as a light diffusion structure and a second hole for the light emitting element, along with a first region on the upper surface having protrusions or recesses that increase in area concentrically outward from the light emitting element, enhancing light extraction and reducing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the thickness of the light emitting module is reduced, then the size of the device is decreased, but the uniformity in light emission deteriorates
Solution Approach 1:
The patent applies local quality by creating a first region on the lightguide plate with a specific pattern of protrusions and/or recesses that has a different area ratio compared to other regions. This localized structural modification optimizes light extraction in the first region to compensate for the reduced thickness, thereby maintaining uniform luminance across the entire light emitting module while achieving a compact form factor
Solution Approach 2:
The patent changes the geometric parameters of the lightguide plate by introducing protrusions and/or recesses with controlled area ratios in the first region. By adjusting these structural parameters, the light extraction efficiency is optimized in specific areas, enabling uniform light emission even with reduced module thickness
2Length of moving object
If the thickness of the light emitting module is reduced, then the device size is decreased, but the unevenness in luminance increases
Solution Approach 1:
The patent addresses luminance uniformity by creating a first region with a specific pattern of protrusions and/or recesses that has a controlled area ratio. This localized structural design compensates for the reduced thickness effect, ensuring uniform light extraction and minimizing luminance unevenness across the light emitting module
Solution Approach 2:
The patent transitions from controlling light emission primarily through thickness (one dimension) to controlling it through surface topology (two-dimensional pattern of protrusions and recesses). This dimensional shift allows uniform light extraction to be achieved through in-plane structural variations rather than relying solely on thickness control
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 a reduced thickness with improved light uniformity and reduced unevenness in luminance, allowing for more efficient light emission and a compact form factor.
Implementation Method 1
a lightguide plate having an upper surface in which a first hole is defined, and a lower surface opposite to the upper surface; and a light emitting element on a lower surface side of the lightguide plate, the light emitting element facing the first hole
Implementation Method 2
The upper surface of the lightguide plate includes a first region defining a plurality of protrusions and/or recesses
Data Source
AI summary
A light emitting module according to one embodiment of the present disclosure includes a lightguide plate having an upper surface in which a first hole is defined, and a lower surface opposite to the upper surface; and a light emitting element on a lower surface side of the lightguide plate, the light emitting element facing the first hole. The upper surface of the lightguide plate includes a first region defining a plurality of protrusions and/or recesses. A ratio of an area occupied by the plurality of protrusions and/or recesses per unit area in a plan view increases concentrically in an outward direction from the light emitting element.