The difference between the digital screen and the analog screen of the LCD liquid crystal display will not be mentioned here about the technical principle. As a digital photo frame user should consider their performance. The differences are as follows:
1. The digital screen uses digital signals in the entire process of image processing, without distortion, and is used in high-fidelity occasions; while the analog screen uses analog signals in part of the drive circuit, there will be losses in the signal transmission and conversion process. There is a signal-to-noise ratio problem, so it is generally only used in occasions where the display effect and stability are not high.
2. The digital screen is a progressively scanned high-definition signal, while the analog screen is an interlaced ordinary video signal. For example, for a 7″ analog screen digital photo frame, corresponding to the NTSC system TV signal, each frame of image contains 525 scanning lines, removing the backward scanning, which effectively displays 480 lines, because it is interlaced scanning, each field contains only 240 scanning lines. Because For system design reasons, only 234 of them are used when used as an analog screen. The philips digital photo frame uses a 7″ digital screen, each frame is one field, and each field is 480 lines, which can perfectly reproduce the exquisite details of the image. 3. The digital screen is not only suitable for displaying dynamic pictures, but also perfect for displaying static pictures. Early analog screens felt jittery and flickering when they were used to display still pictures (digital photos). In fact, they were only suitable for displaying dynamic images such as TVs. However, with the advancement of technology, some analog screens can now display static images to a level close to that of digital screens. Consumers should pay attention to the quality of the different screens when purchasing products.
4. In terms of price, of course the analog screen is cheaper. But in terms of quality, the digital screen is naturally good.
