What do you mean by curtains?

A large piece of cloth, thick fabric, velvet hung on the stage to perform or show a movie.

1. Curtain is a large piece of cloth, thick fabric, velvet and other items hung on the stage for performing or showing movies. Hanging behind the stage is called the sky curtain, and the sides of the stage are called the side curtains. The front of the stage is called a curtain or curtain.

2. The main performance of the curtain considers the gain and viewing angle of the picture. Generally speaking, in terms of curtain, the higher the curtain gain value, the stronger the light projected on the curtain, the higher the brightness of the visual curtain, and the clearer the projected content. Conversely, the lower the gain value, the lower the projected light, the lower the brightness and the lower the projection definition.

Extended data:

The angle of view of the curtain is that you can clearly see the side corner of the screen, and you can see the projected content without sitting in front of the curtain. However, it is often necessary to combine the performance of the projector when choosing the curtain. The brightness of the projector is high, and the gain of the curtain can be lower to maintain the color and layering of the picture. If the projector brightness is low, choose a curtain with high gain to improve the projection brightness and clarity.