Projector specifications
LightOut
Refers to the light energy output by the projector in [lumens] (lm). A physical quantity related to the light output is brightness, which refers to the ratio of light energy emitted by the screen surface to the screen area, and the common unit of brightness is [lux] (lx, 1lx=1 lm/m2). When the light output from the projector passes a certain degree, the larger the projected area is, the lower the brightness is, and the higher the brightness is. Factors that determine the projector's light output include projection, screen area, performance, and lens performance. Usually, the screen area is large and the light output is large. Projector lenses with liquid coupling lenses perform well, and the projector's light output can be increased accordingly.
Horizontal scanning frequency (line frequency)
The movement of the electrons from left to right on the screen is called horizontal scanning, also called scanning. The number of scans per second is called the horizontal scan frequency. The horizontal scan frequency of the video projector is fixed at 15.625 kHz (PAL) or 15.725 kHz (NTSC). The scanning frequency of data and graphics projectors is not a frequency band; In this band, the projector can automatically track the input signal line frequency, and the phase-locked circuit achieves full synchronization with the input signal line frequency. The horizontal scanning frequency is an important indicator to distinguish the grade of the projector. Projectors with a frequency range of 15 kHz to 60 kHz are often called data projectors.
Vertical scanning frequency (field frequency)
The electron beam moves from top to bottom while scanning horizontally. This process is called vertical scanning. Each scan creates an image. The number of scans per second is called the vertical scan frequency. The vertical scan frequency is also called the refresh rate. It represents the number of refreshes per second of the image. The vertical scanning frequency is generally not lower than 50Hz, otherwise the image will have a flickering effect.
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