Light Emitting Device Cover with Back-Side Rough Surface
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Solution Overview
Problem
Existing light emitting devices suffer from reduced display quality due to light propagation from active elements to adjacent inactive elements, causing blurred borders and incorrect illumination perception.
Innovation Solution
A light emitting device design featuring a cover with a light transmissive member and a light-blocking member, where the light transmissive member has a back-side rough surface portion to diffuse and extract propagating light, preventing it from reaching adjacent openings and enhancing display clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a convex lens assembly plate is used to cover light emitting elements, then light can be transmitted and distributed, but light propagates to adjacent inactive elements causing reduced display quality
Solution Approach 1:
The patent applies local quality by creating a rough surface portion at specific locations on the light transmissive member - specifically in regions corresponding to the back sides of light emitting elements. This localized rough treatment selectively scatters light at its source without affecting the overall light transmission function of the cover, thereby preventing light propagation to adjacent inactive elements while maintaining illumination intensity.
2Ease of operation
If a light transmissive member covers all light emitting elements, then light can be transmitted uniformly, but light from active elements propagates to adjacent inactive elements
Solution Approach 1:
The rough surface portion is locally applied only to regions corresponding to the back sides of light emitting elements, not the entire light transmissive member. This localized treatment maintains uniform light transmission across the cover while selectively scattering light at its source to prevent propagation to adjacent elements, thereby preserving border clarity between active and inactive elements.
Solution Approach 2:
The patent converts the harmful effect of light propagation into a beneficial effect by using the rough surface portion to scatter light that would otherwise propagate to adjacent inactive elements. The scattered light is redirected in multiple directions, preventing it from reaching adjacent elements and causing incorrect illumination perception, thus transforming a potential defect into a functional feature that enhances display quality.
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 effectively reduces light propagation, resulting in improved display quality by maintaining clear borders between lit and unlit areas, thus enhancing the overall visual performance of the light emitting device.
Implementation Method 1
the light transmissive member has, on its back side, a back-side rough surface portion in a region different from the region facing the front-surfaces of the light emitting elements
Data Source
AI summary
An object of the present invention is to preventing the propagation of light to improve the display quality of the light emitting device. A light emitting device according to an embodiment has a case, a base member disposed at a front side of the case, a plurality of light emitting elements mounted at the front side of the base member, and a cover covering the light emitting elements. The cover has a light transmissive member integrally covering the plurality of light emitting elements, and a light-blocking member disposed at a front side of the light transmissive member and having openings anterior to the light emitting elements respectively. Further, the light transmissive member has, on its back surface, a back-side rough surface portion in a region different from the region facing the front surfaces of the light emitting elements.