Semiconductor Laser Device with Angled Light Reflecting Member
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Solution Overview
Problem
Conventional semiconductor laser devices struggle to uniformly irradiate laser light onto the light reflective surface of a light guide plate due to the high directivity of laser light, leading to non-uniform luminance in thin liquid crystal display backlights.
Innovation Solution
A semiconductor laser device with a base member having a recess housing a semiconductor laser element and a light reflecting member, where the light reflecting member is arranged to reflect laser light in a direction other than perpendicular to the base member, allowing for uniform light distribution on the light guide plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional light emitting devices emit laser light in a perpendicular direction, then the structure is simple, but the light cannot be uniformly irradiated on the light reflective surface of the light guide plate
Solution Approach 1:
The patent employs asymmetric arrangement of multiple semiconductor laser elements at different positions and orientations relative to the light guide plate. The laser elements are positioned at different distances from the light incident surface and angled at different orientations, creating an asymmetric light emission pattern that achieves uniform light distribution across the light reflective surface.
Solution Approach 2:
The patent transitions from a single perpendicular emission direction to multi-dimensional light emission by arranging laser elements at various angles and positions. This spatial distribution in multiple dimensions allows the light to cover the entire light reflective surface uniformly, solving the limitation of conventional perpendicular emission.
2Ease of operation
If laser light is emitted in a perpendicular direction, then the emission direction is controlled, but the light cannot reach the vicinity of the light incident surface of the light guide plate
Solution Approach 1:
The patent divides the light emission function into multiple semiconductor laser elements positioned at different locations. Each laser element emits light in a controlled direction, and the collective arrangement of these segmented elements achieves both directional control and extensive light coverage including the vicinity of the light incident surface.
Solution Approach 2:
The patent extends the light coverage area by introducing spatial distribution in multiple dimensions. Laser elements are positioned at different distances and angles from the light guide plate, creating a three-dimensional emission pattern that covers both the central and peripheral regions including areas near the light incident surface.
3Reliability
If a light guide plate is used with perpendicular laser emission, then the device structure is compact, but the luminance of the light emitting surface is non-uniform
Solution Approach 1:
The patent applies local quality by positioning laser elements at specific locations and orientations tailored to illuminate different regions of the light guide plate. Each laser element's emission characteristics are optimized for its specific position, with elements closer to certain areas angled to provide focused illumination, thereby achieving uniform luminance across the entire light emitting surface.
Solution Approach 2:
The patent introduces dynamic adjustment capability through the angular orientation of laser elements. The laser elements can be positioned at different angles to dynamically control the light emission direction, allowing optimization of light distribution to achieve uniform luminance while maintaining compact device structure.
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
Enables uniform luminance on the light extracting surface of the light guide plate by accurately directing laser light onto the light reflective surface of the guide plate, facilitating easier mounting and improved light extraction efficiency.
Implementation Method 1
a light reflecting member disposed on the bottom surface of the recess and configured to reflect laser light emitted from the semiconductor laser element
Data Source
AI summary
The semiconductor laser device includes a base member having a recess that opens upward, a semiconductor laser element disposed on a bottom surface of the recess, and a light reflecting member being disposed forward of a light emitting surface of the semiconductor laser element and including a light reflecting surface to reflect laser light emitted from the semiconductor laser element. The semiconductor laser element and the light reflecting member are arranged such that a direction of an optical axis of light that is reflected by the light reflecting member is different from a direction that is perpendicular to a lower surface of the base member.