I saw a post titled "Classification Standards for High-end Color TV Receivers" on the "Audiovisual Research Institute website". It is said that this is just a discussion draft in the industry, and many references are yet to be further discussed. However, the author believes that most of the terminology explanations and classification methods for high-end color TVs in the article are relatively accurate. For ordinary home appliance consumers and general technical personnel, it has a certain reference role. It is recommended here for reference. We look forward to the formal introduction of formal norms and standards as soon as possible.
1. Terms and Definitions
The following terms and definitions apply to this standard
1.1 Dot Pitch
The horizontal distance between the center of two adjacent light-emitting points on the display. The smaller the dot pitch, the more dots on the screen that can make up the image, and the higher the resolution.
1.2 Pixel
The smallest unit that makes up an image. Each pixel should be composed of three luminous bodies of red, green and blue.
1.3 Interlace
In the traditional PALNTSC TV system, the scanning line is the way of image generation. Taking NTSC as an example, instead of continuously scanning 525 scan lines from beginning to end in one sixtieth of a second during each image scan, only half of the scan lines are scanned, that is, 262.5 lines, and the remaining half is in another sixty. Scan in one second. Only the odd lines are scanned horizontally from top to bottom during the first scan, and even lines are scanned during the second scan. The field generated by the second scan is combined into a complete image (Frame). Since the scanning is performed by alternating interlaced scanning with odd and even scanning lines, it is called interlaced scanning. Interlaced scanning will cause image scanning line jitter and image flicker. At present, some DVD players have adopted a sequential (progressive) scanning method with better image quality, and there are also high-end TVs with a built-in progressive conversion circuit. The effect is the same as interlaced. Compared with scanning, it has been greatly improved.
1.4 Progressive Scan (Progressive Scan is also called sequential scan)
Usually referred to as "P", for example 1280 * 720p. The principle is that the screen image is continuously scanned from the first scan line to the last one instead of scanning odd and then even numbers. Progressive scanning can eliminate the flicker caused by interlaced scanning (Flicker), but not because of the order of scanning from beginning to end (without skipping scanning), but because it is scanned in the same time as interlaced scanning 2 Times. Why is it 2 times? Because in the interlaced state, only 30 complete images (Frame, a complete frame) are scanned per second, while in the progressive scan state, 60 complete images can be scanned per second. image.
1.5 Video bandwidth
Video bandwidth, audio has its bandwidth, for example, 20HZ-20kHZ is familiar to us. Video video also has bandwidth. The higher the video bandwidth, the better the picture quality and the higher the resolution. In the PALNTSC system state, usually 1 MHZ video bandwidth can be converted to 80 lines of horizontal resolution. Before the advent of HDTV, the bandwidth of general households using video equipment was about 3MHZ to 6MHz, which means that the maximum horizontal resolution can only be 480 lines. The horizontal and vertical resolution of HDTV is greatly improved, so the video bandwidth of HDTV high-end TV is required to be much higher than 20MHZ.
1.6 Resolution (ResoluTIon)
The ability of a monitor to display the smallest details is called clarity. Generally speaking, the definition we refer to is vertical resolution (how many lines or pixels can be on the horizontal scanning line from top to bottom in the vertical direction). In terms of CRT color TVs, it means how many horizontal scanning lines there are. For example, NTSC system we all say that there are 480 vertical resolution lines (there are 525 scanning lines, but only about 480 lines have the real imaging ability). In terms of fixed pixel display, It is how many pixels the height of a picture can hold. For example, 854 X 480 pixels of a 42-inch WVGA standard wide screen plasma TV, 480 is the vertical resolution, and 854 is the horizontal resolution. The resolution of HDTV is at least 720 lines of vertical resolution (progressive) and 1280 of horizontal resolution.
1.7 Basic resolution (also called intrinsic resolution)
Refers to the actual sharpness index inherent in the pixel display itself, corresponding to the supported resolution.
1.8 Supported resolution
Refers to the method of recalculating or drawing lines through the video processing circuit, down-displaying the image higher than the basic resolution format on the screen. If the basic resolution of the screen is 1024 * 768, through the graphics processing circuit, it can support 1600 * 1200 resolution image display. However, the actual resolution is only 1024 * 768, and there is a gap between the real 1600 * 1200 basic resolution display quality.
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