NewsROHM Introduces Low Power LED Driver ICs for Automotive Displays with Seamless...

ROHM Introduces Low Power LED Driver ICs for Automotive Displays with Seamless PWM Dimming and Reduced Flicker

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ROHM has developed the driver ICs for LEDs that are 4ch/6ch such as BD83A04EFV, BD83A14EFV, the BD82A26MUF-M, which are designed for medium to large-sized car displays used in car infotainment systems and instrument clusters. Recent years have seen the constant development of ADAS (Advanced Driver Assistance Systems) and the redesigned information technology in cars has led to the usage of larger display sizes. Therefore, the LED driver for backlights on LCDs used in automobile displays must offer high-efficiency drive which boosts the rated output current, while also reducing the power consumption.


Advanced Driver Assistance Systems (ADAS) comprise a range of digital technologies that are that are designed to assist drivers during their driving. ADAS systems offer features like adaptive cruise control as well as lane departure alerts blind spot detection, automatic emergency brakes, and many more. The systems make use of sensors like radar, cameras, and lidar to identify possible dangers and offer warnings or automated actions to aid the driver in avoiding accidents. The purpose for ADAS is to increase the safety of vehicles and enhance the driving experience.

Additionally, since the flickering displays in cars can cause unsafe conditions and poor visibility LED drivers should be able to avoid this sign. LED drivers for conventional lighting consume a significant amount of power are also prone to flickering in PWM dimming. Contrarily, ROHM has developed LED drivers for LCD backlights, which combine exclusive low power technology and smooth PWM dimming. This reduces flickering when switching the brightness of the display between low and high. The new products utilize the proprietary Low Power Consumption technology that reduces the loss of LED drivers’ current-control circuits. This results in 20% less total IC power consumption when compared to standard products under normal situations (80mA/ch Circuit current of LED and 12-volt power source). This results in lower power consumption for medium- and large-sized automobile displays in which power consumption is a concern. In addition the models are all outfitted with DC as well as PWM dimming in order to accommodate a broad range of demands. Since there is no longer the need to change between the current feedback mode and high/low brightness with ROHM’s initial seamless PWM dimming technique and flickering caused by the general dimming of PWM is eliminated which improves the reliability of the system.

Moving forward, ROHM will continue to aid in the evolution of next-generation mobility, by creating products that draw on the strengths of analog technologies in order to encourage advancements and reduce energy consumption in the future of automotive cockpit functions. The new model line-up of include both DC as well as PWM dimming, allowing for large-scale application. ROHM’s seamless dimming of PWM allows seamless, non-flickering dimming of the lowest to the highest brightness.

The perfect choice for testing LCD backlight circuits used in automotive displays, these boards have passed a variety of tests like standard electrical properties measurements, EMC, and thermal properties.

The advancement of Advanced Driver Assistance Systems (ADAS) has brought about significant improvements to the automobile industry. They have introduced an entirely new level of security for vehicles, by aiding drivers during their driving and ultimately reducing the amount of accidents that occur in the roadway. However, the use of ADAS and other advanced car information and entertainment features has created the requirement for larger screens in cars. Since the display size increase and the need of LED drivers that can provide efficient drive and reduce the power consumption of the display becomes essential. ROHM’s invention of low power LED driver ICs featuring continuous PWM dimming is a major technological advancement, since it minimizes flickering during PWM dimming. This results in greater visibility and increased reliability of the system. This technology will help in the development of next-generation mobility, as well as the improvement of the future of car cockpit functions.

Electronics and Telecommunications engineer with Electro-energetics Master degree graduation. Lightning designer experienced engineer. Currently working in IT industry.

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