Projection system and moire fringe eliminating method thereof

Abstract

The invention provides a projection system and a moire fringe eliminating method thereof. The projection system includes a light source, and a DMD array and a projection lens located on the light pathof the light source in turn. The projection system further includes a device for eliminating moire fringes. The device for eliminating moire fringes includes a light transmission element and a driving assembly for driving the light transmission element, and the light transmission element is located between the DMD array and the projection lens. The driving assembly is used for driving the light transmission element to vibrate repeatedly between a first deflection state and a second deflection state, so that the light emitted by the DMD array moves back and forth between a first outgoing lightpath and a second outgoing light path after passing through the light transmission element, and the pixels projected by the projection lens onto the screen move back and forth between a first position and a second position. Therefore, the fixed position relationship between the pixels and the sound transmission holes can be destroyed through the changing positions of the pixels, and the moire fringes on the screen can be reduced or eliminated.

Description

technical field [0001] The invention relates to the technical field, more specifically, to a projection system and a method for eliminating moiré. Background technique [0002] In the field of projection, when the pitch of sound holes on the screen is in a certain positional relationship with the vertical and horizontal pixel pitch of the projector DMD (Digital Micro-mirror Device) and the projection distance, a phenomenon similar to water will appear on the screen. The gray (or color) interference fringes of the pattern, that is, the moiré pattern. [0003] At present, there are three main methods to eliminate moiré: 1. Change the position of the projector. However, this method is usually limited by the site environment and cannot be realized. 2. Cut the projection screen, use fewer pixels to project into the original required screen size, and change the positional relationship between the pixels and the sound hole by expanding the pixel spacing, thereby weakening the moir...

AI Technical Summary

Problems solved by technology

[0003] At present, there are three main methods to eliminate moiré: 1. Change the position of the projector. However, this method is usually limited by the site environment and cannot be realized.

2. Cut the projection screen, use fewer pixels to project into the original required screen size, and change the positional relationship between the pixels and the sound hole by expanding the pixel spacing, thereby weakening the moiré. However, this method It will reduce the brightness and resolution of the projected picture, which is equivalent to sacrificing the picture effect

3. Replace with a micro-hole curtain, that is, reduce the diameter of the sound-transmitting hole. However, this method is expensive and difficult to construct, which virtually increases the cost.

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