Surface Light Emitter with Refractive Index Mismatch for Front Brightness
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Solution Overview
Problem
Surface light emitting devices, particularly organic EL devices, face challenges in achieving sufficient front brightness due to light being totally reflected at the emitting surface, leading to limited front luminosity, and existing solutions like minute undulations on the light emitting surface do not effectively increase front luminosity.
Innovation Solution
A surface light emitter with a light control sheet featuring a flat surface with depressions, where transparent material with a lower refractive index than the light control sheet is filled between the depressions and the light emitting surface, allowing for improved light refraction and emission towards the front.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light is emitted from a surface light emitting device, then light is emitted in all directions, but a lot of light is totally reflected at the light emitting side surface and front brightness is insufficient
Solution Approach 1:
The invention applies curvature by providing minute undulations on the light emitting surface of the surface light emitting device. These undulations change the flat surface into a curved surface, which prevents total internal reflection and redirects light toward the front direction, thereby improving front brightness while reducing light loss.
Solution Approach 2:
The invention introduces a new dimension by adding a light control member with undulations on the light emitting surface. This additional structural dimension modifies the light emission pattern from omnidirectional to preferentially forward-directed, resolving the contradiction between total light emission and front brightness.
2Illumination intensity
If minute undulations are provided on the light emitting surface of surface light emitting devices, then light scattering occurs, but front luminosity is not sufficiently increased
Solution Approach 1:
The invention uses minute undulations (curved surface structure) on the light emitting surface to scatter light and improve front luminosity. The curvature of the undulations redirects light that would otherwise be totally reflected, effectively increasing front brightness despite the added surface complexity.
3Illumination intensity
If a flat member provided with undulations is affixed on the light emitting surface, then undulations appear on the surface causing light scattering, but front luminosity is not sufficiently increased
Solution Approach 1:
The invention employs a flat member with undulations (curved surface features) affixed to the light emitting surface. These undulations scatter light and redirect it toward the front, improving front luminosity. The flat member structure with integrated undulations adds minimal complexity while achieving the desired light control effect.
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 significantly enhances front brightness by redirecting and emitting light more effectively towards the front, overcoming the limitations of previous methods and achieving higher luminosity compared to conventional surface light emitting devices.
Implementation Method 1
transparent material is filled in spaces between the depressions and the light emitting side surface, a refractive index of the transparent material being lower than a refraction index of the light control sheet
Data Source
AI summary
To improve the front brightness of the light emitted from a surface light emitter having a surface light emitting device. In the surface light emitter to which a light control sheet having depressions is provided, the surface of the light control sheet having the depressions is adhered to a light emitting side surface of a surface light emitting device, and the transparent material whose refractive index is lower than the refractive index of the light control sheet is arranged in the spaces formed between the depressions and the light emitting side surface of the surface light emitting device.