What are the technical indicators of the projector What are the important parameters of the projecto

1. Resolution.

There are three resolutions: addressable resolution, RGB resolution, and ** resolution. For CRT projectors, addressable resolution refers to the highest pixel that can be resolved by the projection tube, which is mainly determined by the focusing performance of the projection tube, and is an important parameter of the projection tube quality index.

The addressable resolution should be higher than the RGB resolution.

RGB resolution refers to the highest pixel that the projector can pass when connected to the RGB resolution ** signal, such as the resolution of 1024 768, indicating that the horizontal resolution is 1024, the vertical resolution is 768, and the RGB resolution is related to the horizontal scanning frequency, vertical scanning frequency and **bandwidth.

Resolution refers to the highest resolution of a projector when displaying a composite. Here, it is necessary to analyze the relationship between the ** band, horizontal scanning frequency, vertical scanning frequency and RGB resolution: first look at the relationship between horizontal scanning frequency and vertical scanning frequency.

2. Vertical scanning frequency.

The electron beam scans horizontally and moves from top to bottom, a process called vertical scanning. Each time a high hole is scanned to form an image, the number of scans per second is called the vertical scan frequency, and the vertical scan frequency is also called the refresh rate, which indicates the number of times the image is refreshed per second. The vertical scanning frequency is generally not less than 50Hz, otherwise the image will have a flickering feeling.

3. Focusing performance of CRT tube.

The smallest unit of a graph is a pixel. The smaller the pixels, the higher the graphics resolution. In a CRT tube, the minimum pixel is determined by the focusing performance, and the addressable resolution is the minimum number of pixels.

The projector focusing mechanism of CRT tube has three kinds of electrostatic focusing, magnetic focusing and electromagnetic compound focusing, among which electromagnetic composite focusing is more advanced, and its advantage is that the focusing performance is good, especially under high brightness conditions, it will be defocused, and the focusing accuracy is high, and it can be focused in different areas, edge focusing, and four corners focusing, so that every point on the picture is very clear.

4. Convergence. Convergence refers to RGB three colors on the screen and coincide, for CRT projectors, convergence control is particularly important, because it has RGB three kinds of CRT tubes, parallel mounting on the ground bracket, in order to achieve complete convergence of the image, all kinds of distortion of the image must be corrected.

The change of the position of the machine, the convergence should also be readjusted, so the requirements for convergence are one is full function, and the other is convenient and fast. Convergence has static convergence and dynamic convergence, in which dynamic convergence has tilt, bow, amplitude, linear, trapezoidal, pillow and other functions, each of which can be adjusted in both horizontal and vertical directions.

In addition, it is also possible to adjust nonlinear balance, trapezoidal balance, and cushion balance. Some projectors have a point convergence function, which divides the whole screen into 208 points and adjusts them point by point on the 208 points, so every point on the screen is precisely converged.