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A digital picture frame is worth 1,000 words

01 Nov 2007

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The explosive growth of digital cameras has created a problem: What do you do with all those photos? To deal with this problem, many camera owners are adopting a DPF (digital picture frame) to sequentially display a large number of images and as a replacement for the traditional photo album. EDN took a look at the inner workings of the Westinghouse DPF-0561. With a 5.6-in. LCD, 8MB of internal storage, and sockets for multiple plug-in memory formats, the DPF-0561 can display both JPEG still-image files and AVI full-motion files. The current price for the DPF-0561 is $80 to $120.

Unlike many of the simpler frame designs, the DPF-0561 includes several user controls with onscreen-display feedback. A rotary potentiometer controls display brightness, and a set of four pushbuttons controls various functions depending on onscreen-menu modes. The user can select multiple transition effects, slide-show-display speed, memory location, photo orientation, and menu language. The menu options allow the user to select any JPEG image for continuous display or AVI motion file for repeated playback.

The device displays digital pictures and videos on a 5.6-in AT056TN03 LCD from Innolux Display Corp. The display's size and 320px × 234px resolution are barely adequate for a low-end DPF. Like most small LCD units, the display is transmissive; it illuminates pixels from behind with an LED backlight. Other display specifications include a 65° viewing angle, a 300-to-1 contrast ratio, 350-cd/m2 brightness, and a 20ms response time.

The heart of the DPF is the Magic Pixel MP612 multimedia playback controller with decoders for both JPEG and MPEG formats. The circuitry decodes JPEG images at 48Mpx/sec and 640px × 480px MPEG-1/MPEG-4 video at 30fps. The MP612 includes extensive audio-processing features. For downloading data to internal memory, the MP612 includes a USB 2.0 interface controller. An Infineon HYB25D256 DDR 256Mbit SDRAM delivers local processing storage for high-speed image decoding, and a 29LV320 flash memory provides processor program storage.

The MX88V44 TFT-LCD driver provides a single-chip drive for the 240px × 320px resolution QVGA display. The driver accepts analogue composite video in a 4:3 standard format as its input. Composite video, also known as CVBS (colour, video, blanking, and sync), combines the brightness information (luma), the colour information (chroma), and the synchronising signals on one input pin. Portable televisions and DVD players widely use the MX88V44, supporting programmable brightness, contrast, and saturation.

The DPF-0561 boasts a range of picture-storage options. Users can download as much as 8MB of JPEG or AVI images directly over the USB connection to the internal Hynix Semiconductor NAND-flash memory. If you reduce the resolution to 640px × 480px pixels, the internal memory holds more than 80 images. The playback controller also includes interfaces for multiple external storage devices, such as smart media, memory sticks, multimedia, and xD-picture cards as well as micro drive and Ultra-DMA66 hard-disc drives. A CompactFlash connector is hidden on the back of the board.




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