Why does the projector display real images?

The light screen can receive the real image, and placing the light screen at the position of the image can receive the clear image, which is the case with the projector. Therefore, the image presented by the projector is a real image, and the principle of real image should be used in photography or film projection.

In convex lens imaging, the real image is inverted relative to the original object. If the light emitted by an object diverges after being reflected or refracted by an optical element, they extend in opposite directions and intersect to form a virtual image. For a projector, the picture is reversed when playing, so that the projection looks upright.

Extended data:

For the components related to projector image display, it mainly includes using corresponding light transmission to generate images, and also needs to use reflection to generate images. But no matter what type, the projected light is divided into three colors: red, green and blue, and then many color images are generated.

For the component itself, only monochrome display can be realized, and it is precisely for this reason that three components are needed to produce three colors. Finally, the three-color image is synthesized by prism to make it into an image, and then reflected to the screen by lens.

Baidu Encyclopedia-Real Images