Optical Device Light Leakage Reduction via Luminous Intensity Control
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Solution Overview
Problem
Light-transmissive OLEDs used in applications like automobile tail lamps can cause erroneous detection in light receiving elements due to emitted light, necessitating a reduction in light incidence to prevent false readings.
Innovation Solution
The optical device incorporates a substrate with light emitting elements and transmission portions, where the second surface is positioned over a medium with a lower refractive index, and the light distribution is adjusted to ensure luminous intensity in the critical-angle direction is equal to or less than 0.36 times that in the direction perpendicular to the substrate, reducing light leakage and erroneous detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light emitting elements are positioned at the first surface side of the substrate, then light emission function is achieved, but light leakage to the second surface side causes erroneous detection in light receiving elements
Solution Approach 1:
The patent controls the luminous intensity distribution parameters of the light emitting elements, specifically setting the luminous intensity in the critical-angle direction to be equal to or less than 0.36 times the luminous intensity in the direction perpendicular to the substrate. This parameter control prevents light leakage to the second surface side while maintaining detection accuracy of the light receiving element.
2Measurement precision
If the luminous intensity in the critical-angle direction is reduced to prevent light leakage, then detection accuracy improves, but light emission efficiency may be compromised
Solution Approach 1:
The patent optimizes the luminous intensity distribution parameters to achieve a balance between detection precision and light emission efficiency. By controlling the luminous intensity in the critical-angle direction to be equal to or less than 0.36 times the luminous intensity in the perpendicular direction, the patent prevents light leakage that would cause erroneous detection while maintaining sufficient overall light emission efficiency for the light emitting device to function effectively.
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
This configuration effectively minimizes light leakage from the light emitting device to the light receiving element, reducing erroneous detection and enhancing the accuracy of optical sensing in applications like automotive tail lamps.
Implementation Method 1
each of the light emitting elements including a first electrode, an organic layer, and a second electrode
Implementation Method 2
a medium having a refractive index lower than that of the substrate is positioned at the second surface side of the substrate
Implementation Method 3
luminous intensity in a critical-angle direction of the substrate and the medium
Data Source
AI summary
An optical device includes a light emitting device and a sensor device (light receiving element). The light emitting device includes a substrate, a plurality of light emitting elements, and a plurality of light transmission portions. The substrate has a first surface and a second surface. The second surface is opposite to the first surface. The plurality of light emitting elements is positioned at the first surface side of the substrate. Each of the plurality of light transmission portions is positioned between adjacent light emitting elements. The light emitting device is light-transmissive by the plurality of light transmission portions. Light from the plurality of light emitting elements is mainly output from the second surface of the substrate. An amount of light emitted from each of the light emitting elements and leaked to the outside of the first surface of the substrate is reduced.