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Retrofocus type projection optical system

An optical system and rear projection technology, which is applied in the field of projection optical systems, can solve the problems of different rear lens groups, image display, and inability to provide a large enough viewing angle.

Inactive Publication Date: 2005-08-31
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, there is a problem with the conventional projection optical system that the rear lens group must have different curvatures depending on its position due to ghost images generated by the rear lens group causing unwanted images to be displayed on the screen.
In addition, since the iris 20 is placed next to the sixth lens 6, it is difficult to insert a new iris to control the amount of light
In addition, traditional projection optics cannot provide a large enough viewing angle

Method used

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  • Retrofocus type projection optical system
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Embodiment Construction

[0028] Reference will now be made in detail to embodiments of the present general inventive concept, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like parts throughout. The embodiments are described below in order to explain the present general inventive concept by referring to the figures.

[0029] figure 2 is a view showing the structure of a rear projection optical system according to an embodiment of the present general inventive concept. figure 2 The rear projection optical system can be applied to an image projection device using a DMD panel, such as a projection TV. To explain, figure 2 The main components of the image projection device are shown. refer to figure 2 , the image projection device has a screen, a rear projection optical system 50, a lamp 75, a prism 80, and a DMD panel 90 to form an image. When the 50” screen is used as the standard screen, according to figure 2 The rear projection opti...

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Abstract

A rear projection optical system to enlarge and project images of an image-forming panel onto a rear side of a screen includes a front lens group disposed in a vicinity of the screen, and having first, second, and third lenses having a negative power respectively, and fourth and fifth lenses having a positive power respectively, a rear lens group disposed in a vicinity of the panel, and having a first bonding lens including a sixth lens with a positive power and a seventh lens with a negative power, a second bonding lens including an eighth lens with a negative power and a ninth lens with a positive power, and a tenth lens with a negative power, and an iris disposed between the front lens group and the rear lens group to control an amount of light. The rear projection optical system enables a wide angle-of-view (91 degrees), a high resolution, and a reduced depth of a display device.

Description

technical field [0001] The present general inventive concept relates to a projection optical system using a projection type image display device, and more particularly, to a rear projection lens system configured with a sufficiently short projection distance to achieve a wide viewing angle and high resolution. Background technique [0002] Recently, due to the demand for a wide viewing angle and high resolution of an image display device, an image projection device that projects and enlarges a small-sized image on a large screen by using a projection optical system has been rapidly developed. In particular, rear projection devices that project image signals from the rear of a screen are widely used in projection televisions. [0003] A conventional rear projection device includes: a light source; a liquid crystal display (LCD) or digital micromirror device (DMD) panel as a display device that forms an image by using light emitted from the light sourc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G02B13/04G02B13/16G02B13/18G02F1/1335G03B21/10G03B21/14
CPCG02B13/04G02B13/16G03B21/14
Inventor 金省兑
Owner SAMSUNG ELECTRONICS CO LTD