When choosing an image projector, many factors need to be considered, such as the projection method, advantages, and disadvantages of the method, brand name, and application classification. For example, the projection methods include front projection, rear projection, and suspended ceiling. Attention should be paid to these points when selecting projectors: in the selection and purchase of projectors，it’s necessary to get clear the nature of the information source to be displayed. what is its line frequency and what display card is used to output it? According to the nature of the source displayed, projectors can be divided into two categories: ordinary video machines and digital machines. When only full TV signals are displayed, such as playing videotapes, a normal video player can be selected. To display the signal output by VGA card, select the digital machine. Confirm the installation method. The projector installation method is divided into table type forward projection, suspended ceiling forward projection, table type rear projection, and suspended ceiling rear projection. The overhead projector is on the same side as the audience. Rear projection is that the projector and the audience are at both ends of the screen respectively. If for temporary use, the table ceiling can be selected. If the space is large and there is an overall arrangement in civil construction, the overall effect of rear projection is quite good. If the space is small, the rear projection refraction method can be selected. And you may like the mini home theater projector.
Skills of using
- Before turning on the projector power supply, it is necessary to confirm the normal connection of the cable that connects the projector and ensure that the video source has been output normally. After completing the projection connection and turning on the projector, it is also necessary to switch the output mode. Since there are three output modes of the projector, you can press and hold the Win logo key and F5 key simultaneously (when connected to a notebook computer, you can press the Fn key and F8 key) to select the appropriate screen output mode.
- In the eyes of users who are not familiar with the projector, the projector is like an ordinary TV set, which can be turned on if you want. When it is time to shut down, the power supply is mostly cut off directly. In fact, this kind of operation is the "taboo" when using the projector, because the direct shutdown of the projector for a long time will seriously affect the service life of the projector bulb. Correct power-on sequence: The first turn on the projector power button, then press the Lamp button on the projector operation panel, and when the blinking green signal lamp stops blinking, power-on is completed. Correct shutdown sequence: Press the Lamp button first, and then press the Lamp button when there is a prompt on the screen whether it is necessary to shut down. Then the green signal lamp on the projector control panel starts flashing. When the cooling fan inside the projector stops rotating completely and the green signal lamp stops flashing, turn off the projector and cut off the power supply. In addition, it is best to ensure an interval of about 3 minutes between each on/off operation in order to fully dissipate heat from the projector. Opening and closing operations and frequency operations are easy to cause the projector bulb to burst or the internal electrical components of the projector to be damaged.
- Whether the projector lens is clean or not will directly affect the clarity of the contents on the projection screen. When various circles or spots appear on the screen, it is mostly the dust on the projection lens caused it. At the same time, the projector lens is very delicate and needs to be covered when not in use to avoid such trouble.