Rear projection system

Abstract

A rear projection system comprises an image device, a projection lens, a first concave reflector, a second curve reflector, a reflecting mirror and a projection screen; wherein the projection lens isarranged corresponding to the image device, the first concave reflector is arranged on the optical axis of the projection lens, the second curve reflector is arranged on the reflected light path of the first concave reflector, the reflecting mirror is arranged on the reflected light path of the second curve reflector, and the projection screen is arranged corresponding to the reflecting mirror; and the image device irradiates onto the first concave reflector by the projection lens and then is reflected to the second curve reflector, and the image of the second curve reflector arrives at the projection screen by reflecting of the reflecting mirror. The rear projection system of the invention achieves rear projection system thinning by the projection lens and two curve reflectors, and meanwhile diaphragm is utilized to achieve optimal optical contrast of rear projection system, the problem that the existing rear projection system has the defects of large depth volume and low contrast canbe solved, so as to realize thinning of rear projection system.

Description

technical field [0001] The invention relates to the technical field of projection, in particular to a rear projection system. Background technique [0002] Rear projection system (for example: rear projection TV) used to be the mainstream of large-size TV when CRT occupied the mainstream of the market. Rear projection system manufacturing large-screen display has many advantages compared with CRT large-screen display, such as: light weight, relative depth Wait a minute. However, when flat panel TVs (such as LCD and PDP) gradually began to develop from small and medium sizes to larger sizes, many CRT manufacturers, especially those in mainland China, were looking for industrial transformation and upgrading to catch up with market trends. The improvement work of volume is then not deepened, therefore, the rear projection system is gradually abandoned by people because of its larger volume. [0003] Such as figure 1 Shown is the existing rear projection system, including: di...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a rear projection system, through the projection objective lens and two curved mirrors to achieve the purpose of thinning the rear projection system, and at the same time use the diaphragm to achieve the best optical contrast of the rear projection system, which can overcome the disadvantages of the existing rear projection system Large depth volume and low-contrast defects make the rear projection system thinner

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