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Automotive Local Dimming System with Renesas R-Car Gen3 (H3)


The Renesas R-Car Gen3 (H3) is a popular automotive system-in-package (SiP) designed for in-vehicle infotainment, cockpit, and digital cluster applications. It is a 64-bit nona-core ARM SoC that features four Cortex-A57 cores, four Cortex-A53 cores, and a dual-core lock-step Cortex-R7 for real-time processing. The chip supports up to quad-channel LPDDR4-3200 memory and incorporates the Imagination’s PowerVR GX6650 GPU. The R-Car H3 is used to kickstart hardware and software development in the automotive industry, reducing the time-to-market period. It is compliant with ISO 26262 safety standards and offers enhanced security functions. Renesas also offers other automotive boards, including the R-Car Gen3e series, which provides increased CPU performance for entry- to mid-range automotive applications.


Dynamic Dimming

A conventional LCD display consists of a display assembly and a light source. In the TenXer CN339 livebench demo, the display assembly is represented by an LCD screen, and the light source is represented by an iw7059 LED driver with an LED strip. The R-Car backlight dimming solution implemented in this demo offers several advantages.

Firstly, it saves energy by only activating the necessary LEDs for the video being played, unlike conventional backlight LEDs that stay on with the same intensity all the time. This dynamic dimming feature ensures that power is not wasted on unnecessary backlighting.

Secondly, the LiveBench solution reduces thermal dissipation by selectively activating only the relevant backlight LEDs. This leads to improved thermal management and potentially extends the lifespan of the LEDs.

Lastly, the LiveBench solution enhances the user experience by reducing the afterimage effect in the eye. Projecting light only from the relevant LEDs minimizes the persistence of vision, resulting in a smoother and more visually appealing display.

Benchmark Tests

System benchmark tests are used to evaluate the performance and capabilities of a device. These tests provide valuable insights into the device’s processing power and overall system performance. Benchmark tests are often conducted using specialized software tools that simulate real-world scenarios and measure the device’s performance under different conditions. 



  • Testing dimming solution with both preloaded videos & user-uploaded videos.
  • Visualize reduction in current consumption by the backlight LED strip.
  • System resource usage measurements.
  • Dimming app CPU & RAM usage.
  • VSYNC & MOSI signal plots.

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