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ROHM Co., Ltd. recently developed a white LED driver for backlights that can automatically dim, and the new model "BD6095GUL" can automatically adjust according to the brightness around the LCD screen and the brightness of the displayed image signal. The backlight of the display is the first in the industry. This type of drive is best suited for portable devices such as mobile phones and PDAs, portable driving guidance systems, portable game consoles, and portable audio. By using "BD6095GUL", you can get the best image display effect, even if you watch the picture for a long time, you will not be tired, and you can also realize a low-power backlight control system.
Due to the recent development of portable devices, the time for users to view liquid crystal images in various places such as indoors, cars, and even outdoors has increased. In this way, two problems must be solved: one is how the backlight that consumes a large current in the liquid crystal module can save energy; the other is to adjust the brightness of the image so that the eye does not fatigue even if the eye is focused on the display image for a long time. ROHM's "BD6095GUL" developed this time automatically adjusts the backlight according to the displayed image. The driving system of the conventional illuminance sensor completely illuminates the backlight when the dim image that does not require backlighting is displayed. 『BD6095GUL〠can adapt to changes in image conditions, and dim the lit white LED in real time when the backlight does not have to be fully lit, thus greatly reducing power consumption. Moreover, it has another advantage in that a built-in illumination sensor IC interface circuit is capable of finely and automatically adjusting the drive current in 256 stages in coordination with an input signal from the sensor IC. In this way, there is no image flickering and easy to see, and the power consumption is low; compared with the conventional white LED driver without dimming function, the power consumption is greatly reduced, only about 1/3 of the former.
In addition, "BD6095GUL" uses the charge pump circuit to select the boosting factor for boosting the lit white LED without any omission, and adds another block to the original 3rd gear ('1, '1.5, '2). '1.33), this is unprecedented in the industry. By raising the voltage to a value closer to the forward voltage of the white LED, the power consumed by the white LED can be suppressed, and a low power design can be performed.
In addition to the "BD6095GUL", as a series corresponding to "automatic dimming", "real-time active image dimming" and "x1.33 charge pump", ROHM also has white LED drivers that are paired for easy auto dimming. The functional automatic dimming controller "BD6092GU" is suitable for different types of products for various purposes.
These new products are scheduled to be supplied with samples starting at 10 this year (sample price: 500 yen), and will be mass-produced on a monthly basis of 500,000 units from February 2008. The first step of the manufacturing process was carried out at ROHM Hamamatsu Co., Ltd. (Shizuoka Prefecture), and the latter process was completed at ROHM Fukuoka Co., Ltd. (Fukuoka Prefecture). Reading era
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