Today’s digital photo frames generally have multiple functions, but their main function is to play photos. Therefore, one of the playback effects of photos-the clarity of the picture is obviously our first consideration. Compared with the narrow screen with limited field of view, the large-screen digital photo frame has become the darling of the market more and more. At present, the largest screen on the market reaches 19 inches, and the mainstream size is between 10-15 inches. Of course, you get what you pay for. “The bigger the face, the more expensive.” Good brands, such as Philips’ 7FF1M4 and 9FF2M4, are smaller. The price difference between the screen and the large screen is even more, reaching several hundred yuan! In addition, the picture effect is mainly determined by factors such as “resolution”, “contrast”, and “brightness”.
The value of resolution refers to the number of horizontal pixels and vertical pixels on all visible areas of the entire display screen. It is also the most basic point for us to measure the clarity of the image display. The higher the resolution, the richer the performance details and the clearer the effect. ; Contrast refers to the measurement of different brightness levels between the brightest white and the darkest black in the bright and dark areas of an image. The larger the difference range, the greater the contrast, and the smaller the difference range, the smaller the contrast. A good contrast ratio 120:1 can easily display vivid and rich colors. When the contrast ratio is as high as 300:1, it can support the larger the color ratio of each level, the richer the color performance, and the brighter the picture. Brightness refers to the brightness of the screen, the unit is candela per square meter (cd/m2) or nits. It is understood that a digital photo frame with a high-definition TFT LCD display, 800*480 high resolution and 200cd/㎡ brightness can achieve brilliant and full color performance in terms of display effects.
