100 Hz technology
The term 100 Hz technology is used in television sets for two completely different methods of video processing.
For televisions with a CRT screen
In televisions with a cathode ray tube , the technology is used to generate a flicker-free image. The video signal transmitted with a (half) frame rate of 50 Hz is temporarily stored in the device in RAM modules and played back at twice the frequency (100 Hz).
In the European television standard (PAL), a new picture is transmitted 25 times per second; the frame rate is therefore 25 frames / second. In order to reduce the flickering effect that occurs , the interlace procedure developed by Telefunken employee Fritz Schröter at the end of the 1920s is used worldwide for analog transmission , in which 50 fields of even and odd lines are transmitted per second. The disadvantage here is that the human eye still perceives a slight flicker at this frequency, especially on horizontal lines or objects moving quickly horizontally (e.g. sports broadcasts), which only disappears from around 80 Hertz.
The image from a 100 Hz device is therefore perceived as calmer, but if the necessary deinterlacing is poorly implemented , image errors such as jerky movements, image tremors or blurred contours can occur, especially with fast-moving images.
To counteract this phenomenon, some device manufacturers developed techniques in which intermediate images are calculated and inserted between the existing images. This is a form of motion interpolation that is also used in flat screens.
For flat screens (LCD televisions)
Television sets with flat screens in liquid crystal technology produce a flicker-free picture regardless of the frame rate. Here the term is used for a technique to reduce motion blur. See motion interpolation .
See also
The 100 Hz technology should not be confused with line doubling or progressive scan . The interlace method is also used with the 100 Hz technology.