عملية التطابق في الشاشة الملونة ذات القواذف والنقاط الخطبة ( In line) .

11- The process of matching in the color screen with launchers and sermon points (in line):

The screen with launchers and dots is in (line). Its triads are on one line for every three dots (red - green - blue). Likewise, the launchers are on one line, and not in a triangular shape, as in the (delta) type. Figure (11-42) shows both screens and a comparison between them. As for the matching process in the linear type, it is easier. Because it dispenses with the vertical matching files, which is no longer necessary because it is achieved by the effect of the vertical deviation files, and the need continues only for the horizontal matching files.

The General Electric Company has developed this linear screen, ejectors and phosphor points - so it reduced the equipment necessary for matching operations and their controls, so this screen was suitable for use in mobile TV devices. After a period of using the device, some items were introduced. As for the advanced linear type, it does not require any resetting of the proximity after its initial setting at the factory. Figure (11-43) Therefore, deflection coils, static matching magnets, and purity magnets are installed on the neck of the screen, so that their position does not change over the life of the screen, and not all linear screens may have the same features mentioned.

11-12 Modern color screen developments Trintron screen valve:

This modern color screen has three linear ejectors. The phosphor dots on the screen produce RG-B colours. They are regular in the form of vertical lines, as in Figure (11-44). As for the shade mask, its openings are in the form of vertical lattice slits.

This screen has one element for focusing the beam and one accelerating grid (Focusing). The process of adjusting the convergence is carried out by means of four panels (Fig. There may be a common ruling grid in the small screen measuring less than 12 inches, and in the case of independent ruling grids, the visual signals are applied to the ruling grids or to the cathodes.

Adjusting the convergence of the trinitron valve:

Since the phosphorescent dots are distributed linearly and in the form of tricolor vertical lines, it is no. There is a need for a vertical matching control circuit - while the static and kinetic matching process in the horizontal direction cannot be dispensed with.
This is done with the help of four panels fed with direct current DC or alternating current in some measurements.
The middle plates are connected to the elevator inside the screen and the green stimulating beam passes through them and is not affected by them because they are under the same potential difference - and the two plates also protect the green beam from being affected by the static magnetic field of static and kinetic matching that is generated in the two outer plates - and accordingly the green beam does not require a matching process .

Adjust the static matching of red and blue:

The horizontal matching of the red and blue beams takes place by changing the potential difference between the outer and inner plates. We have learned that the inner plates have the same anode voltage, while the outer plates each have a DC voltage applied to it. It is 2 less than the elevator effort. And by adjusting both continuous voltages, the process of static matching of the three rays can be achieved, and this is what is done in screens larger than (12) inches to preserve matching in the entire area of ​​the screen or image. As for smaller screens, it applies an equivalent cut-off current that is added to the DC static matching voltage to keep matching throughout the screen.

11-13 The upgraded color screen has three focus efforts:

This modern screen has a neck of a small diameter (2.91 cm) and the degree of deviation in it is (100), its launchers are linear, and its phosphorescent dots are also distributed in a vertical manner, as in the Tritronon type, but the lines of the phosphor dots are separated by dark black lines, and its mask has narrow vertical slits - which makes It negates the need for vertical matching - while horizontal matching is done with deflection files whose axis can be shifted accurately horizontally or vertically - in order to correct the matching of the three electronic rays, and Figure (11-46) shows the difference between a regular 25-inch color screen and a developed three-voltage screen Shorter neck and no static match adjustment required - no procedure required

Kinetic matching. Therefore, the elements of the screen neck are less - and the shade mask with slits has been made in a way that prevents weakening of the purity of the colors when it is heated and expanded. The focus of the beam (Focus) is done by two voltages
(7 kV and 12 kV) Voltage (12 kV) is applied to grid (3) and grid (5). Between them lies the network (4) to which 7 kV is applied, and this is what determines the electric field affecting the focus, making the beam smaller in diameter and less deviating from the required point. It secures the voltage (12 kV) from the horizontal output transformer. Because there are three different voltages on networks (2), (3-5) and (4)