New RGB chip LED for automotive interiors minimises colour variations

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 colours 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 minimises colour variation by precisely controlling the luminous characteristics of the RGB elements and improving colour mixing through in-house device technology.

Generally, developing RGB chip LEDs that emit light at the specified colour requires precise control of the wavelength and brightness of the mounted red, green, and blue (RGB) elements individually and methods to enhance colour-mixing capability.

ROHM has minimised element colour variation over general products by utilising a vertically integrated production system from the element fabrication stage – one of ROHM's strengths. At the same time, original element colour mixing control technology reduces colour variations caused by colour mixing that tends to occur in RGB chip LEDs, resulting in accurate colour expression required in automotive interiors. ROHM also supports detailed colour 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 optimised for automotive lighting through a quality-first approach.
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Chromaticity Simulation System

The SMLVN6RGBFU sets adjustment coefficients for each chromaticity rank while providing calibration support to bring the colour closer to the desired target. This new RGB chip LED and high-accuracy chromaticity simulation allows precise colour matching.
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Product Lineup

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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.