The main design challenges and solutions
Electronics, LCD, Monitor, Screen Tagged 8, Battery, Hp, inch, LCD, pb992a, pb994a, presario, Screen, Touch, x1300 No Comments »National Semiconductor Asia Pacific marketing manager for power management products, said Wu Zhimin, TFT backlight application and other similar applications in the digital photo frame, LED backlight the main challenge is how to control the constant current flowing through the LED and produces a higher contrast. He stressed that “in addition to AC adapter, some digital photo frames can also be powered by a lithium-ion battery. To extend battery life, power and efficiency become very important factor.”
Wu Zhimin Description, National Semiconductor has a variety of LCD backlight solution, widely used in digital photo frame applications for small panels and large-size panels (20 inches).8 Inch Touch Screen LCD The latest LM3431 is a step-up controller integrated 3-channel constant-current regulator. It can be provided for the three series of high-precision LED constant current. The maximum output current of 150mA, through the expansion drive after 6 LED string. LM3431 provides excellent performance PWM dimming, dimming frequencies up 25kHz, this time to support 100:1 contrast ratio. 8 Inch Touch screen VGA Monitor If the dimming frequency to further reduce it, the contrast will be more than 1,000:1.
NXP Tim Chen that the digital photo frame applications codec processing will be another challenge. “Many users like the product of media-based VLIW DSP processor, however, to conduct real-time H.26? 1080i HD decoding and encoding is very challenging. Perhaps to the existing DSP technology, to use 2 to four chips to achieve this goal. “NXP’s program in, TM3282 is a VLIW media processor TriMedia 32 the latest version, it has sufficient computational performance to handle a variety of operating modes the future. The processors are able to multi-frame rate compressed video stream and associated audio stream to decode and encode. In addition to VLIW core, PNX1005 also includes a bit co-processor and embedded trace module.8 Inch Touch screen Monitor In addition, removed in the PNX1005 chip 2D graphics capabilities, and to 0.09um process design, so to further reduce costs and power consumption.
Shen Zhen Jia Wen product group is of the view, digital photo frame chip will be the trend toward SoC development to significantly reduce the cost and type of chip DSP SoC not need to consider a higher power consumption and overheating.