News: Optoelectronics
13 July 2023
Japan’s ROHM Semiconductor has launched a new RGB chip LED (SMLVN6RGBFU) suitable for automotive interiors, such as function/status indicators in instrument clusters, CID (Center Information Displays), car audio/navigation, heater control etc, as well as automotive ambient/accent lighting (footwells, roof, handles, cup holders, etc).
In recent years, more driver assistance functions (i.e. automatic speed control, vehicle distance/white line detection) have been introduced as vehicles become progressively electronic and sophisticated. As such, the demand for RGB chip LEDs capable of expressing a range of colors to indicate operational status in instrument panels and meter clusters is rising. In addition, there is an increasing need to create a comfortable and luxurious cabin space with decorative lighting using RGB chip LEDs.
In response, ROHM has developed an RGB chip LED that further minimizes color variation by precisely controlling the luminous characteristics of the RGB elements and improving color mixing through in-house device technology.
Generally, developing RGB chip LEDs that emit light at the specified color requires precise control of the wavelength and brightness of the mounted red, green and blue (RGB) elements individually and methods to enhance color-mixing capability. ROHM says that it has minimized element color variation over general products by utilizing a vertically integrated production system from the element fabrication stage – claimed to be one of ROHM’s strengths.
At the same time, original element color mixing control technology reduces color variations caused by color mixing that tends to occur in RGB chip LEDs, resulting in the accurate color expression required in automotive interiors. ROHM also supports detailed color matching tailored to user specifications with the chromaticity simulation system.
Chromaticity simulation system
The SMLVN6RGBFU sets adjustment coefficients for each chromaticity rank while providing calibration support to bring the color closer to the desired target. The new RGB chip LED and high-accuracy chromaticity simulation allows precise color matching, says ROHM.
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- Source: https://www.semiconductor-today.com/news_items/2023/jul/rohm-130723.shtml
