Projection system and projection display method

Abstract

A projection system includes a first light source that is an array light source, the first light source being divided into a plurality of illumination regions, each illumination region being independently controllable to generate a first illumination light field that is light and shade modulatable; and a second light source, comprising a light-emitting unit and a light guide element. The light guide element redistributes the illumination light emitted by the light emitting unit to generate a second illumination light field with adjustable brightness, and the first illumination light field andthe second illumination light field are superposed to generate a composite light field. The invention further provides a projection display method. According to the invention, the purposes of increasing the picture peak brightness and reducing the picture black field brightness can be achieved at the same time, so that the projection system with high contrast is obtained.

Description

technical field [0001] The present invention relates to the technical field of optical imaging, and in particular, to a projection system and a projection display method. Background technique [0002] The high dynamic range (HDR) projection system can increase the contrast and peak brightness of the projector output, so that the bright field and dark field parts of the picture can display rich grayscale information, which greatly improves the effect of the picture and the viewing experience of the audience. The first way to achieve high dynamic range in existing projection systems is to use dual spatial light modulators in series to control the light emitted by the light source to achieve high dynamic range display effects. Due to the addition of a new spatial light modulator, the projection system generally has the problem of low light efficiency. Its light efficiency is about 36% of the ordinary projection system. The lower light efficiency makes the projection system more...

AI Technical Summary

Problems solved by technology

The first way for existing projection systems to achieve high dynamic range is to use dual spatial light modulators in series to control the light emitted by the light source to achieve high dynamic range display effects. However, the current HDR system using two spatial light modulators Due to the addition of a new spatial light modulator, the projection system generally has the problem of low light efficiency, and its light efficiency is about 36% of that of ordinary projection systems. The low light efficiency makes the projection system less effective in achieving higher peak brightness. difficulty

Another way is to use two projection systems, one to display a standard contrast ratio picture, and the other to display a high-brightness component to brighten the brightness of the high-light part to achieve a high peak brightness display. However, the minimum black that can be achieved in the picture The field brightness is limited by the projectors that produce standard contrast images, so that the brightness of the black field of the projection system using this technology is still very high, thereby reducing the contrast and viewing experience

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