ROHM developed a white LED driver capable of automatically dimming the backlight

ROHM Corporation has recently developed an automatic dimming backlight for white LED driver, this type of "BD6095GUL" of the new products according to the brightness of the LCD display around, and show the brightness of image signal to automatically adjust the display backlight brightness, which is the industry's first. The driver is best suited for portable devices such as mobile phones and PDA, portable car driving guidance systems, portable gaming consoles, and portable audio devices. Using the "BD6095GUL" can get the best image display effect, even if the long time to watch the screen will not be tired, but also can achieve a low-power backlight control system.

Due to the recent development of portable devices, the user in the interior, the car and even outdoors and other occasions to see the LCD screen time increased. As a result, it is necessary to solve two problems: one is in the current consumption of large LCD back light to energy saving; two is the image brightness adjustment, making the eyes even long time watching the display image focus will fatigue. ROHM the development of the "BD6095GUL" can be automatically adjusted according to the image display backlight. The traditional illumination sensor drive system, when the display does not need to dim the backlight backlight image is also completely lit. "BD6095GUL" can adapt to the changes in the image condition, when the backlight does not have to be completely lit when the real-time dimming of the white light LED, thereby greatly reducing the power consumption. Moreover, it has another advantage is the built-in lighting sensor IC interface circuit, with the input signal from the sensor IC can be divided into 256 levels to automatically adjust the drive current. In this way, there will be no image flicker and easy to see, low power consumption; compared with the traditional white light LED driver without dimming function, the power consumption is greatly reduced, only about 1/3.

In addition, the "white LED by the charge pump circuit of light BD6095GUL, without missing any step-up boost multiple choice, in the original 3 files (1, 1.5, 2) on the basis of adding a block (1.33), which is hitherto unknown in the industry. When the voltage rises to a value closer to the forward voltage of the white LED, the power consumption of the white LED can be suppressed, and the low power design can be carried out.

In addition to "BD6095GUL", as with the "automatic light adjustment" and "real time image light" and "x1.33" corresponding to the charge pump series, different types of products ROHM and white LED driver pairing and easy realization of automatic dimming function automatic dimming controller "BD6092GU" and is suitable for various purposes.

These new products are scheduled for 10 this year, the supply of samples (sample price: 500 yen), from February 2008 to the month of production on the scale of 500 thousand. The manufacturing process before a process in ROHM Corporation (Hamamatsu Shizuoka), after a period of operation in Fukuoka ROHM Corporation (Fukuoka county) completed.

Source: the world of electronic products