Display Technology of Dream box

In terms of the television and computer monitors, CRT display is a mature technology, but with low-resolution TV display text, especially less than 24 × 24 in small print, the problem becomes complicated. TV picture tube is a low-resolution large pitch tube, only for display 720 × 576 or 640 × 480 image, and its deflection system is fixed, for the 525 line 60Hz or 625 line 50Hz design, and Digital TV more than 18 kinds of display formats. Internet access will have to comply with VESA format, obviously, the TV display system cannot adapt to so many formats.

In addition, low frame rate of interlaced television scanning, when the display graphics and text, and background luminance signal flashing, flickering horizontal lines between the lines there. If the progressive scan converter to the TV on computer graphics, horizontal edge of the field will appear only in odd or even field, display time close to the human eye's persistence of vision, the edge will have severe flicker and, therefore, to use television machine online, we must remedy the defects in the TV show.

According to technical difficulty and cost of two ways to improve the current one is anti-flicker filter, the adjacent three lines add the image into a line of proportion, so that only a single field in each of the image reproduced, filtering method called the three lines in this way. Three lines of filtering method is simple and easy to implement.

Another method is to interlaced into progressive scan, and an appropriate increase in frame rate, this approach to multiply the number of scan lines and field number, in order to increase the number of not out of nothing as to ensure the continuous activities of the screen nature, we must make the line, the venue and the motion compensation interpolation operation, must be a dedicated chip and complex technology can be achieved, in this way the computer graphics on the TV show's quality is very good, but times must be in a progressive and scanning can be achieved on the TV.

In addition to higher resolution than HDTV and VESA analog TV signals on a TV play, only show part of the screen, like the PIP must be reduced this way, we should throw line and lost games. To ensure the continuity of the same image, but also the interpolation operation.