Light-emitting module with light-modulating member for uniform luminance
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Solution Overview
Problem
Existing planar light sources experience uneven luminance due to the diffusive reflection of light by the side surfaces of the light guide parts, which affects the uniformity of light emission.
Innovation Solution
A light-emitting module is designed with a specific configuration that includes a first and second light guide part, a light source, and a light-modulating member positioned above the first A-major surface, which modulates the light diffusely reflected by the first side surface to reduce uneven luminance. The light-modulating member overlaps the first A-major surface and first side surface, adjusting the light emission to achieve uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a light guide plate is used to distribute light, then light can be emitted across a large area, but uneven luminance occurs due to diffusive reflection from side surfaces
Solution Approach 1:
A light-modulating member is introduced as an intermediary component between the light guide plate and the observer. This member specifically modulates the light emitted from the side surface region, reducing the excessive luminance caused by diffusive reflection and achieving more uniform overall luminance distribution across the light emitting surface.
Solution Approach 2:
The light-modulating member is positioned to overlap specifically with the side surface region of the light guide plate when viewed in top view. This localized placement allows selective modulation of light from the problematic side surface area without affecting other regions, achieving uniform luminance while maintaining efficient light utilization.
2Ease of manufacture
If the light guide plate structure is simplified, then manufacturing is easier, but luminance uniformity deteriorates
Solution Approach 1:
The light guide plate is divided into multiple light guide parts with distinct functions: a main light guide part for primary light distribution and additional light guide parts extending in specific directions for enhanced light extraction. This segmentation allows each part to be optimized for its specific role while maintaining overall manufacturing simplicity.
Solution Approach 2:
The light-modulating member serves as an additional intermediary component that addresses luminance uniformity without requiring complex modifications to the light guide plate structure itself. This approach maintains manufacturing simplicity while achieving the desired optical performance.
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 configuration effectively reduces uneven luminance by modulating the light emitted from the first side surface, enhancing the uniformity of the light-emitting module's luminance and allowing for a more compact design.
Implementation Method 1
the diffusive reflection of light by the side surfaces of the light guide parts
Data Source
AI summary
A light-emitting module includes first and second light sources, first and second light guide parts, and a first light-modulating member. The first light guide part includes a first A-major surface, a first B-major surface, a first side surface positioned between the first A-major surface and the first B-major surface, and a first hole portion in which the first light source is disposed. The second light guide part includes a second A-major surface, a second B-major surface, a second side surface positioned between the second A-major surface and the second B-major surface, the second side surface facing the first side surface, and a second hole portion in which the second light source is disposed. The first light-modulating member is positioned at an upper side of the first A-major surface. The first light-modulating member overlaps the first A-major surface and the first side surface when viewed in top-view.