The AS3824 controller ensures independent and flexible pulse width modulation (PWM) for each channel of the LED, and local backlight adjustment for the deepest black areas for true perception
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21ics Ames Semiconductor has introduced a new 16-channel LED TV backlight controller AS3824, which can achieve partial backlight adjustment of the display, significantly improving TV image quality while saving energy by up to 20% - 30%.
The new backlight controller is planned for the latest high definition (HD) and ultra high definition (UHD) TVs as well as high dynamic range (HDR) displays and displays. The AS3824's 16 channels each contain a fully flexible 12-bit pulse width modulator (PWM) to ensure that the display is partially backlight-independent, and each PWM generator can be synchronized with an external sync signal.
The 16-channel independent backlighting feature allows the backlight intensity of each selected area to be precisely controlled so that the picture content of each successive frame on the display is matched. When the area of ​​a frame needs to be dimmed, the illumination of the LED in that area will dim the backlight independently of the other parts, thereby ensuring that the television can restore the real image even in the deepest black area, enhancing the viewing experience. In contrast, traditional full-range backlight controllers do not prevent some of the light from leaking into the black display area, causing the black areas to appear gray.
In addition, the AS3824's partial backlight performance enables additional system power savings compared to traditional full-lit backlight controllers. The AS3824 backlight controller's precision internal 10-bit digital-to-analog converter (DAC) provides full-scale control of current accuracy (up to 5% of error) through external metal-oxide-semiconductor field-effect transistors (MOSFETs) or bipolar transistors. The backlight controller supports all LED backlight topologies with no restrictions on the current or voltage through the LEDs.
The device's 16 channels also feature a complementary 8-bit current-controlled digital-to-analog converter (DAC) that can be used to increase or decrease the local current strength of the LEDs in certain frames to enhance dynamic contrast, enabling the AS3824 to support HDR displays. And HDR TV.
The AS3824 also features a comprehensive set of protection support features, including thermal shutdown. When the temperature exceeds 140 °C, the LED short-circuit detection function will be turned on. The device can be programmed via a series of external interfaces and linked in daisy-chain to as many AS3824 devices as possible in the application.
"With the introduction of AS3824, Amers Semiconductor will be the first LED backlight control to support the latest Dolby VisionTM digital technology standard for UHD displays," said Bernd Krafthoefer, Marketing Manager, Power Management Division, Amers Semiconductors. The semiconductor supplier of the device helps display manufacturers achieve sharp contrasts and reproduce the deepest black in the TV image."
Samples of the AS3824 are available now, and the demonstration kit is also available.
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