According to the CRT characteristics, CRT is divided into those four categories

No company's products are all the same Sony is Trilon Mitsubishi is Diamond Long Samsung is Dana LG is the future window This is a more mainstream display However, Sony and Mitsubishi seem to have been discontinued, and there are many domestic manufacturers who generally use Samsung's picture tube.

Glass shells. The housings of modern CRTs are made of glass. The shell of the glass beam is divided into three parts: the screen, the glass cone and the pipe neck. The vacuum degree in the glass case is (1 5) 10-5 Pa. The screen of the picture tube is rectangular, and the size of the screen is usually indicated by the length of the diagonal

Previously it was the high brightness of CRT. Now the backlight of the liquid crystal is LED, which is 120% of the brightness of the CRT. 50% longer lifespan; Electricity consumption is half that of CRT. Liquid crystal is the mainstream.

LCD TV is good! It's a good hair, you have to fix it if there is a problem, and the goods are expensive enough. There was a period of time to help others repair, but if they couldn't repair it, they were relied on, what a dead guy, and the 56,000 yuan TV was said to have been repaired by a repairman.

The brightness of the CRT is definitely lower than that of the LCD, with a maximum average brightness of 100 nits for the 29" CRT and a minimum of 400 nits for the LCD.

The contrast ratio of CRT is higher than that of LCD (because LCD has light leakage); CRT reproduces moving pictures better than LCD, and LCD reproduces still images better than CRT;

The color gamut range of CRT is higher than that of current LCDs;

Among LCD OLED, PDP, SED and other flat panel displays, the best performance is SED (equivalent to concentrating millions of smile CRTs), but the best performance and marketization are two different things.

For small screen ordinary color TVs,CRT is divided into two types: thick pipe diameter and thin pipe diameter,According to the pin arrangement, it is divided into 7 pins、9 pins、11 pins and so on。 The 11-foot CRT is mostly phased out at the moment. In daily maintenance, you can use any 14-inch 21-inch CRT connector for maintenance, the pin is best 7 pin or 9 pin, if you encounter a special circuit board with pins, you can use a new tube socket with 7 wires to connect to the original machine video release board, and then plug the new tube socket into the maintenance CRT to test the maintenance of the large screen machine on the market are all thick pipe diameter 9 pin tube socket, part of the flat color TV is a double focus tube base, the pin arrangement is the same, but the latter has one more focusing pole than the former.

The parameters of the deflection coil of this type of CRT are similar, and a normal 25-inch CRT inch can also be used for maintenance, but it is best to use 25-inch). Practice has proved that this kind of CRT, regardless of size, can basically meet the maintenance requirements directly on the machine. For PCBs equipped with dual-focus CRT, the original header can be removed.

Install a new single-focus header (generally the color TV circuit board is reserved for the installation holes of two kinds of headers), and connect the two focus wires to the focusing pole in the header. Note: The deflection parameters and pin arrangement may be different on some miscellaneous machines assembled using foreign waste CRT.

No way. Because the model is different, the order of the pins is also different.

"Sony's latest flat-only picture tubes, the FDTRINLTRON and Mitsubishi Diamondtronnf, have a cylindrical inner surface and a flat outer surface. ”

Upstairs wrong! Sony's flat picture tube is indeed pure flat, and only Sony's flat picture tube is a veritable flat picture tube! In order to strengthen the stability of the vertical grid, Sony has added two horizontal metal wires, and in the case of reducing the brightness, the two black lines can be faintly seen, which is also the difference between the Sony Trilon plane tube and other plane tubes.

If it is a cylindrical surface, these two metal wires cannot be straightened, that is, they have no effect at all!

The scanning is mainly for CRT imaging equipment, which emits light by bombarding the phosphor on the screen with an electron beam, one pixel at a time. In order to ensure that imaging is possible, it is necessary to deflect the equipment and scan horizontally and vertically to form a complete image. Due to the short luminescence time of phosphor, in the millisecond range, in order to ensure that the image can be continuously displayed, it must be refreshed regularly to keep the electron beam able to bombard the screen uninterruptedly.

In the past, we used to see picture tube televisions and picture tube displays, which are this kind of imaging equipment.

There are two types of CRT scanning methods: interlaced and progressive.

Seed. Interlaced is divided into two cycles to display an image, that is, the previous cycle scans even rows, empty odd lines, the next cycle sweeps odd lines, empty even lines, each image is divided into odd frames and even frames, electron beam.

Odd-numbered frames are scanned to form an incomplete image, then even-numbered frames are scanned, and finally two frames are combined into one image. This scanning method is the imaging standard of most TVs, and the current PAL standard TV in China.

Signals, it's all this way of scanning. The downside is that the screen flickered, dazzling. The progressive scanning method, which is no longer divided into odd and even frames, is a scan of all lines at once, so that the image is stable and does not flicker, and most CRT displays use progressive scanning (before 1996, most monitors used interlacing).

For LCD TVs, the imaging principle is completely different from CRT, therefore, on LCD devices, there is no concept of scanning. Generally, the pixel point of the liquid crystal corresponds to the display memory, and changing the content of the display memory also changes the display content of the image. What is relevant to the display memory is the refresh rate, not the form of scan.

Hope it helps.

LCD TV and CRT are not the same principle, LCD screen is a liquid crystal molecule on the screen, through a selective switch to form an image. You can look at the screen with a magnifying glass, or take a close-up shot of the screen with a camera, and then zoom in to make it clear.

CRT has progressive and interlaced scans.

In '98, the first progressive scanning prototype was produced.

Liquid crystals are every color molecule that emits light through a backlit LED (early products were CCFL fluorescent lamps).