Lumissil Microsystems, a division of Integrated Silicon Solution, Inc. (ISSI), announces the release of the IS32FL3749, its latest matrix driver IC for controlling arrays of mini-LEDs. It is targeted at the automotive LCD backlight market that utilizes white mini-LED arrays for large ultra-high contrast Central Informa on Displays (CID).
The IS32FL3749 is an automotive-grade mini-LED matrix driver IC for LCD backlight applications that supports multiple local dimming zones. More dimming zones offer greater contrast control (difference between dark and bright parts of an image), true black levels, and minimized blooming (halos of light around bright light sources). LCDs with more backlight LEDs and more dimming zones, result in brighter displays with a highly granular contrast control. The IS32FL3749 integrates a 33 MHz serial bus that communicates with other IS32FL3749 devices to create thousands of dimming zones using a daisy-chain cascade protocol.
Local dimming refers to an array of individually addressed white LEDs behind the LCD panel to create a backlight. Controlling the LCD backlight’s local dimming enables selective dimming of screen areas that are darker while keeping luminous screen areas bright. This technology enhances the apparent contrast ratio resulting in improved image quality. Array local dimming is necessary to display High Dynamic Range (HDR) content and improve content visibility under all lighting conditions.
“Automotive displays have evolved and we’re entering a new era where the central information display has become the primary means for presenting vehicle information," said Ven Shan VP of Lumissil Marketing. “Automotive displays must support an ever-growing assortment of images, information, and data, making their luminance, and readability essential for a safe driving environment. The IS32FL3749 provides accurate zonal dimming and LED brightness control to meet these demanding backlight display requirements.”
The IS32FL3749 is a configurable 24 × n matrix LED driver with a selectable number of columns (n=1~4) and 24 high voltage (16 V) constant current rows. Each of the 96 LEDs in the array can be pulse-width modulated (PWM) with 16-bit precision and its 60 mA current can be adjusted with 8-bit control registers resulting in a fine granularity of backlight dimming zones. Each LED can be scanned for an open/short condition with the result stored in a register. All registers such as the current, temperature, spread spectrum, LED open/short, etc., can be accessed and programmed via the 33 MHz serial bus.
The IS32FL3749 can be turned off by either pulling the SDB pin low or by using the software shutdown feature to obtain a minimum current consumption of 3.3 μA. Proprietary algorithms such as the spread spectrum of the PWM clock, channel-to-channel timing skew, and channel group delay are used in the IS32FL3749 to minimize power bus and EMI noise.
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