New RGB Chip LED for Automotive Interiors Minimizes Color Variations due to Color Mixing

Contributes to accurate color representation in cabin function/status indicators and accent lighting

Willich-Münchheide, Germany, July 06, 2023 – ROHM has developed an RGB chip LED, SMLVN6RGBFU ideal for automotive interiors, such as function and status indicators in instrument clusters, CID (Center Information Displays) and accent lighting for footwells and door handles. (Fig. 1) 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 also 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 has minimized element color variation over general products by utilizing a vertically integrated production system from the element fabrication stage - 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 accurate color expression required in automotive interiors. ROHM also supports detailed color matching tailored to user specifications with the chromaticity simulation system. ROHM will continue to contribute to improving in-vehicle comfort and safety by developing industry-leading products optimized for automotive lighting through a quality-first approach. (Fig. 2) 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. This new RGB chip LED and high-accuracy chromaticity simulation allows precise color matching. (Fig. 3) Product Lineup (Fig. 4) Application Examples Indicators for function/status display: Instrument clusters, CID, car audio/navigation, heater control, etc. Automotive Ambient lighting: footwells, roof, handles, cup holders, etc.

About ROHM Semiconductor ROHM Semiconductor is a global company of 507.9 billion yen per March 31st, 2023, with over 23,700 employees. The company develops and manufactures a very large product range from SiC Diodes and MOSFETs, Analog ICs such as Gate Drivers and Power Management ICs to Power Transistors and Diodes to Passive Components. The production of our high performing products is taking place in state-of-the-art manufacturing plants in Japan, Germany, Korea, Malaysia, Thailand, the Philippines, and China. ROHM Semiconductor Europe has its Head Office near Dusseldorf serving the EMEA region (Europe, Middle East, and Africa). For further information, please contact www.rohm.com