Light Emitting Device With Flat Transmissive Member
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Solution Overview
Problem
Existing light emitting devices are not compact enough and suffer from color unevenness, particularly in vehicular applications where miniaturization and uniform luminance are required.
Innovation Solution
A light emitting device design featuring a light-transmissive member with flat and parallel upper and lower surfaces, containing a phosphor, and a protruding side portion that contacts the lower surface, which covers the light extraction surface of the light emitting element, ensuring uniform front luminance and reduced color unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the outer peripheral side surface of the light-transmissive member is made as a sloped surface spreading toward the lower surface, then higher luminance is achieved, but the device size increases and color unevenness occurs
Solution Approach 1:
The light-transmissive member employs asymmetric surface design where the side surface is substantially vertical while the lower surface has a specific shape, creating asymmetric light extraction paths that achieve high luminance without requiring the device to be larger
Solution Approach 2:
The invention transitions from a two-dimensional sloped surface approach to a three-dimensional structure where the lower surface has a specific shape with curved or angled portions, enabling light redirection in multiple dimensions to achieve high luminance from a compact form factor
2Illumination intensity
If the outer peripheral side surface is made as a sloped surface with light reflecting resin, then higher luminance is achieved, but color unevenness increases
Solution Approach 1:
The light reflecting resin is selectively applied only to specific regions of the lower surface rather than the entire side surface, creating local optical enhancement zones that boost luminance while preserving color uniformity in other areas
Solution Approach 2:
Instead of applying light reflecting resin to the entire side surface (excessive action), the invention applies it only to specific portions of the lower surface (partial action), achieving sufficient luminance enhancement without causing color unevenness
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 further miniaturization, uniform front luminance, and reduced color unevenness, enhancing visibility and manufacturing yield while preventing light leakage and adhesive-related issues.
Implementation Method 1
the light-transmissive member contains a phosphor
Data Source
AI summary
A light emitting device includes a light emitting element whose upper surface is a light extraction surface, and a light-transmissive member that has an upper surface and a lower surface, and covers the light extraction surface of the light emitting element. The light-transmissive member contains a phosphor. The upper surface and the lower surface of the light-transmissive member are both flat surfaces and parallel to each other. A side surface of the light-transmissive member has a protruding portion that protrudes to the side and has contact with the lower surface.