Second, the projector is intelligent: built-in Android operating system, online movies, online TV, you can watch it if you want; Play online games if you want!
Third, the installation simplicity of the projector: minimize the installation complexity of the machine without connecting unnecessary connecting wires; Support wireless same screen; Support wireless connections such as audio/video/TV of various intelligent terminal devices!
Fourth, the energy saving of the projector: try to choose the projector with LED light source: LED light source has low power consumption, fast response and realistic color reproduction; The processing color is bright and clear, and the working time is long.
5. Brightness of the projector: Home theater projectors basically work without lights, so the projector does not need to have high brightness, but the brightness value should not be too low, and the reference value is above 1000ANSI lumens. The projector with this brightness value can meet the demand of watching the picture of 100 inch in the daytime when the curtains are pulled up.
6. Resolution: The ideal physical resolution is above 1920X 1080, that is, the high-definition video of 1080P can be output point to point, and a good visual experience can be obtained when watching high-definition movies with clear and delicate picture quality.
Focusing performance of CRT picture tube: the smallest unit of a picture is a pixel. The smaller the pixel, the higher the resolution of the graph. In CRT kinescope, the minimum pixel is determined by focusing performance, and the so-called addressable resolution refers to the minimum number of pixels.
There are three focusing mechanisms for CRT projectors: electrostatic focusing, magnetic focusing and electromagnetic compound focusing. Among them, electromagnetic compound focusing is more advanced and has the advantages of good focusing performance, especially defocusing under high brightness and high focusing accuracy. It can focus on different areas, edges and corners, so that every point on the screen is clear.
Extended data:
First, the light in the projection environment cannot be strong, and it is best to have weak light.
The projection quality of the projector is not only related to the brightness of the projection bulb, but also related to the influence of the projection environment. The light intensity of the projector working environment will directly affect the projection effect. Therefore, before using the projector, we must first arrange the working environment of the projector and make the projection bulb work in dim light environment as much as possible.
Bright ambient light will make the brightness effect of the projection bulb worse, making it difficult for students to watch. In order to make the projector get better projection effect, we might as well install dark opaque curtains in the room to block the outdoor light, and use materials that are not suitable for reflection on the walls of the room. These details will enable the projector to produce a better projection effect with the same brightness of the projection bulbs.
Second, pay attention to the order of power switches.
Correctly switching the projector power supply has a great influence on the service life of the projection bulb and the projector internal accessories. If the power supply of the projector is turned off at will, the power supply of the projection bulb and the circuit part of the projector may be turned off together, and the cooling fan inside the projector will also stop working due to power failure.
As a result, a large amount of heat generated by the projection bulb and projector cannot be discharged in time through the cooling fan. This situation is likely to cause the projection bulb to explode, damage the internal circuit board, and make the projector unable to work normally. The correct operation sequence of turning on and off the projector power supply is: turn on the power supply first when turning on.
Continue to press and hold the indicator button on the projector control panel until it no longer flashes; You can also send a power-on command through the power-on button on the remote controller, and the projector will be powered on according to the preset power-on program. Do not directly cut off the power supply of the projector when it is turned off. You should hold down the power off indicator button until the indicator light stops flashing.
(At this time, the cooling fan inside the projector continues to operate to dissipate heat, and stops rotating after about 5 minutes); You can also issue the shutdown command through the shutdown button on the remote control. At this time, the CPU inside the projector will instruct the cooling fan to dissipate heat at full speed.
At the same time, the CPU should detect the temperature inside the projector. If it is higher than 40℃, it will issue an instruction to keep the cooling fan running to dissipate heat. If it is lower than 40℃, it will give an instruction to stop the cooling fan, and notify that the power can be cut off through the indicator light. At this time, the power supply of the projector will be cut off.
Third, there should be a certain time interval after turning off and turning on.
When the projector is switched from the on state to the off state, the cooling time should be at least about 5 minutes apart. Because the power supply of the projector uses switching power supply to step down, stabilize voltage and stabilize power, when switching frequently, the high-power switch tube and transformer used in the projector power supply all work at a higher frequency.
The switch tube will generate considerable power consumption in the process of frequent switching, and these lost power will be converted into heat to be emitted, thus improving the internal temperature of the projector; In addition, the heat emitted by the light bulb itself is concentrated in the narrow space inside the projector.
The sudden change of temperature is easy to make the projection bulb explode; In addition, the frequent switching of the projector power supply will also have a great current impact on the projection bulb, which will easily lead to the damage of the projection bulb; It may also damage components in the circuit.
Baidu encyclopedia-projector
Phoenix. Avoid pitfalls: a guide to choosing a small white projector