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Projection display

A technology of projection display and projection unit, which is applied in the direction of using projection devices, image reproducers, projection devices, TVs, etc., and can solve problems such as image deformation

Inactive Publication Date: 2008-09-24
CHUNGHWA PICTURE TUBES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the general projection display device is designed to face the screen, so when the projection display device is not facing the screen (for example, at an elevation angle), the projected image at a large angle will show image distortion. Please refer to FIG. 3A, which is a conventional Keystone distortion picture of technology projection display device

Method used

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Examples

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Embodiment Construction

[0017] The projection display device of an embodiment of the present invention is described below with a preferred embodiment.

[0018] Please also see Figure 2A and Figure 2B , which are respectively a schematic diagram of a projection display device according to an embodiment of the present invention and a Figure 2A The enlarged schematic diagram of the incident surface. In this embodiment, the projection display device includes a wedge plate 10 and a projection unit 14, the projection unit 14 is used to project image light onto the wedge plate 10 for display, wherein the wedge plate 10 includes an image display area 11 And an extension area 12, the image display area 11 is used to project the image light from the projection unit 14 on the screen, and the extension area 12 is used to assist the refraction of the image light, wherein the extension area 12 has a light incident Surface 15 and a light-emitting surface 16, the light-incidence surface 15 has a recessed porti...

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PUM

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Abstract

The invention discloses a projection display device that the light guide-in plane part of a wedge-shaped plate is designed as a curved surface, a conical surface or a concave part with an irregular surface according to the menu characteristic to be shown. The required distance for refracting image ray in the wedge-shaped plate is effectively reduced by the light refraction theory, but the imaging size is not changed, which can further reduce the size of the projection display device. In addition, the concave part of the light guide-in plane can also has the effect of different amplification on the image of different parts, so as to correct the keystone distortion.

Description

technical field [0001] The invention relates to a projection display device, in particular to a projection display device which utilizes a wedge-shaped plate with a light-incident surface of a concave portion to reduce the size of the device and adjust image distortion. Background technique [0002] Please also see Figure 1A and Figure 1B , which are respectively a schematic diagram of a projection display device in the prior art and according to Figure 1A The enlarged schematic diagram of the incident surface. The existing projection display device uses the total reflection of the waveguide (wave-guide) by the wedge plate 1 to project the image light to the image area 2. Due to the light refraction and the imaging length of the lens, the wedge plate 1 needs an extension area 3 to assist light refraction, so that the image is presented in the image area 2; therefore, the necessity of the extension area 3 causes the size of the entire projection display device to be very ...

Claims

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Application Information

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IPC IPC(8): G03B21/00H04N5/74H04N9/31
Inventor 吴忠颖陈志隆郑伊凯张燃宏周明德吴世民莫启能
Owner CHUNGHWA PICTURE TUBES LTD