- ROHM Automotive Lighting Solutions
Color is considered to be one of the most important means of communication and as such is used in a variety of ways – daily. However, approximately over 200 million people with P-type and D-type color deficiencies around the world find it difficult to distinguish between red and green, possibly resulting in information being inaccurately conveyed – depending on the combination of colors used. Furthermore, since color vision can vary from person to person, it is difficult to perceive how different people see certain colors, which can be very inconvenient and also problematic as other people may not notice this deficiency.
As a result, there is a growing need in the society to implement Color Universal Design that takes into account the various types of color vision in order to deliver information accurately to as many people as possible. ROHM succeeded in developing blue-green chip LEDs with special wavelengths. These products are ideal for implementing Color Universal Design in a wide range of devices, utilizing a vertically integrated production system from the element fabrication stage and leveraging ROHM’s strength thorough quality control.
While there are a variety of devices that transmit information using red and green colors, adopting blue-green and orange or yellow will make it easier for people with P-type or D-type color deficiency and difficulty to distinguish red and green colors. As such, the color scheme is important for conveying information using LEDs.
Now, by acquiring Color Universal Design certification for ROHM’s SMLD12E2N1W and SMLD12E3N1W blue-green LEDs, it is possible for people with various types of color vision and sensitivities to accurately identify color patterns that include the use of ROHM’s blue LED (SMLD12BN1WT86, λD: 470nm) and warm color LEDs (SML-D15YW, λD: 590nm; SML-D15DW, λD: 605nm) – making them ideal for Color Universal Design applications.
SThe SMLD12 series (SMLD12E2N1W and SMLD12E3N1W) utilizes a new resin that improves on the following issues when using conventional epoxy and silicone resins, allowing worry-free use in devices requiring high reliability.
1）20x longer life vs. epoxy resin
Luminous intensity is maintained even during endurance testing (25°C, IF=20mA, 1,000hrs), resulting in approx. 20x longer life at the same residual light intensity level vs epoxy resin products.
2）25x higher mold strength compared to silicone resin
Adopting a new resin material which affects mountability improves mold strength by 25x compared to silicone resin products even at high temperatures (Ta=150°C). This minimizes defects during mounting, achieving superior mountability.
P-Type / D-Type Colorblind
CUDO classifies the differences in color vision into the following 5 types.
|C-Type (Common)||A person with normal color vision who has all three types of photoreceptor cone cells: red, green, and blue|
|P-Type (Protanopia)||Strong: No or non-functioning cone cells for detecting red light
Weak: Red cone cells with spectral sensitivity shifted towards green cone cells
|D-Type (Deuteranopia)||Strong: No or non-functioning cone cells for detecting green light
Weak: Green cone cells with spectral sensitivity shifted towards red cone cells
|T-Type (Tritanopia)||No cone cells for primarily detecting blue light; functionally weak|
|A-Type (Achromatopia)||Only has one type of cone cell, no cone cells at all, or all cells are weak|
Color Universal Design
A design system developed in consideration of people with various types of color vision – allowing information to be accurately conveyed to as many individuals as possible