Side-View Light Emitting Device with Recessed Reflecting Layer
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Solution Overview
Problem
Existing side-view type light emitting devices for mobile terminals are challenged in efficiently extracting light from the light emitting element to the front side while being small, lightweight, and thin, as they require efficient light extraction and a compact design.
Innovation Solution
A light emitting device with a resin-molded base member and embedded leads, featuring a recessed light emitting element with a reflecting layer on its side surfaces to enhance light extraction efficiency and a thin, compact form factor, utilizing a resin-molded body with a groove-shaped recess and columnar leads for improved heat radiation and connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a conventional side-view type light emitting device is used, then the device can be made thin, but light extraction efficiency to the front side deteriorates
Solution Approach 1:
The patent applies local quality by providing a reflecting layer on the side surface of the light emitting element chip. This localized reflective property directs light that would otherwise escape laterally to instead travel toward the front surface, improving front-side light extraction efficiency without increasing device thickness. The reflecting layer is specifically positioned where light extraction needs enhancement.
Solution Approach 2:
The patent utilizes the vertical dimension by forming a groove-shaped recess in the base member that accommodates the light emitting element. This recess structure allows the light emitting element to be positioned at a lower level, creating a stepped configuration that improves front-side light extraction while maintaining overall device thinness. The groove depth and positioning in the vertical dimension enable better light direction toward the front surface.
2Volume of moving object
If the device size is reduced for mobile terminals, then the device becomes more compact, but heat radiation characteristics worsen
Solution Approach 1:
The patent segments the base member structure by forming a groove-shaped recess that creates distinct zones: a lower region housing the light emitting element and an upper region for light extraction. This segmentation allows optimized thermal pathways while maintaining compact dimensions. The leads embedded in the base member also serve as thermal conduction paths, segmenting heat transfer routes from the light emitting element to the base member and eventually to external heat sinks.
Solution Approach 2:
The base member acts as an intermediary thermal management component. It receives heat from the light emitting element through the leads and provides a structured pathway for heat dissipation. The groove-shaped recess in the base member facilitates both optical function and thermal management by positioning the light emitting element optimally while allowing efficient heat conduction through the leads and base member structure to external environments.
3Illumination intensity
If a reflecting layer is added to the light emitting element, then light extraction efficiency improves, but device complexity increases
Solution Approach 1:
The patent merges the reflecting layer directly onto the side surface of the light emitting element chip, combining the light extraction enhancement function with the existing light emitting structure. This integration avoids adding separate complex optical components. The groove-shaped recess in the base member also merges multiple functions: mechanical support, optical positioning, and thermal management, thereby reducing overall device complexity despite adding the reflecting layer.
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 a small and thin side-view type light emitting device that efficiently extracts light to the front side, improving light extraction efficiency and heat radiation characteristics, while maintaining a compact and lightweight design suitable for mobile terminals.
Implementation Method 1
a reflecting layer limiting a light-emitting region to a predetermined range. The reflecting layer is disposed on or over a side surface of the light emitting element
Implementation Method 2
a base member comprising a resin-molded body having an upper surface, a lower surface, and a front surface having a recess formed in a groove-shaped from the upper surface to the lower surface
Implementation Method 3
A lead can be embedded in the resin-molded body
Implementation Method 4
columnar leads for improved heat radiation and connection
Implementation Method 5
a recess formed in a groove-shaped from the upper surface to the lower surface. The light emitting element is disposed on a bottom surface of the recess
Data Source
AI summary
A light emitting device includes a base member including a resin-molded body having an upper surface, a lower surface and a front surface, and formed with a groove-shaped recess in the front surface across the front surface from the upper surface to the lower surface. A lead can be embedded in the resin-molded body. A light emitting element is provided, and can include a light emitting element chip and a reflecting layer limiting a light-emitting region to a predetermined range. The reflecting layer can be disposed on or over a side surface of the light emitting element. The light emitting element is disposed on a bottom surface of the recess such that the reflecting layer is spaced apart from a side wall of the recess.