Projection device

A technology of projection device and optical transmission medium, which is applied to optical elements, optics, instruments, etc., and can solve the problems of angle problems, inability to be thinned, and limited volume of rear-projection projection devices.

Inactive Publication Date: 2009-02-25
CHUNGHWA PICTURE TUBES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when there is a problem with the angle at which the optical image 112 is transmitted to the display screen 120 or when the transmission path needs to be changed, the known rear-projection projection device cannot make proper adjustments.
Also because of this, the volume of the rear-projection projection device will be limited by the internal optical path design and cannot be thinned

Method used

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Embodiment Construction

[0028] image 3 It is a schematic cross-sectional view of the structure of the projection device in the first embodiment of the present invention. Please refer to image 3 , the projection device 300 is mainly composed of a display screen 320 and an imaging system 310 . Wherein, the imaging system 310 is adapted to provide an optical image 312 , and the optical image 312 is transmitted to the display screen 320 through an optical transmission medium 330 with a refractive index not equal to 1. Here, the light transmission medium 330 may be a solid material, a liquid material, or a liquid crystal or the like.

[0029] It is worth mentioning that, in a preferred embodiment, the refractive index of the optical transmission medium 330 changes along the transmission path of the optical image 312, and this optical transmission medium 330 is, for example, made of two or more substances. composition. That is to say, the light transmission medium 330 may be solid material, liquid ma...

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Abstract

A projection device is featured as providing optical image by imaging system, transmitting said optical image to display screen by light transmission media with refractivity being not equal to one, enabling to change transmission path of optical image by controlling refractivity of light transmission media so as to make said projection device be thin and small.

Description

technical field [0001] The present invention relates to a projection device, and in particular to a projection device capable of reducing the overall volume by adjusting the light refraction path through a medium or a reflective element. Background technique [0002] The rapid progress of the multimedia society is mostly due to the rapid progress of semiconductor components and displays. As far as the display is concerned, since the direct-view display still has many limitations on large-scale display, the rear-projection projector and Rear projection TV has gradually become the mainstream trend. [0003] figure 1 and figure 2 They are schematic cross-sectional views of two known rear-projection projection devices, respectively. Please refer to figure 1 , the known rear-projection projection device 100 directly transmits the optical image 112 to the display screen 120 through the imaging system 110, and figure 2 The rear-projection projection device 200 also provides...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/18G02B1/00G02B17/08G02B26/08
Inventor 陈志隆张燃宏郑伊凯周明德
Owner CHUNGHWA PICTURE TUBES LTD
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