KR20000032887A - Stereoscopic image projector - Google Patents

Abstract

PURPOSE: A stereoscopic image projector is provided to project a stereoscopic by using a single CRT projector is provided. CONSTITUTION: A stereoscopic image projector divides R, G, B chrominance signals from image signals of even number fields and odd number fields, respectively, and alternately projects or intercepts the chrominance signals according to a synchronous signal, by using a single CRT projector(600) and a liquid crystal optical shutter(800). As a result, the stereoscopic image is embodied without flickering.

Description

Stereoscopic image projection device

The present invention relates to a stereoscopic image projection apparatus, and more particularly, to a stereoscopic image projection apparatus capable of projecting a stereoscopic image using a single CRT projector.

In order to form a stereoscopic image, the left and right eye images must be recognized in the left and right eyes, respectively. To this end, as shown in FIG. 1, two CRT projectors are used as a stereoscopic image projection apparatus. . This conventional stereoscopic image projection apparatus is constructed as follows.

That is, the image signal input unit 10, the odd / even field separator 20, the odd field signal processor 30a, the even field signal processor 30b, the CRT projector 40a for odd field images, the CRT for even field images It consists of a projector 40b, projection lenses 50a and 50b, two linear polarizers 60a and 60b and a screen 70. There is also a need for polarizing glasses 80 for the viewer.

Here, the image signal input unit 10 provides a composite image signal path, and each frame of the image input signal applied through the image signal input unit 10 is used for the left and right eyes of the odd / even field separator 20. Each of the odd field and even field signals can be separated to be used as a video field signal. The odd and even fields thus separated are doubled in the odd field signal processing unit 30a and the even field signal processing unit 30b, respectively, and are made at 60 Hz to be separated into the left eye CRT projector 40a and the right eye projector 40b. Is entered. Projection lenses 50a and 50b are disposed in front of the binocular CRT projectors 40a and 40b, respectively, and in front of the two projection lenses 50a and 50b, respectively, the vertical polarizer 60a and the horizontal polarizer ( 60b) is installed. When the image is projected onto the screen 70 using the CRT projectors 40a and 40b configured as described above, the left eye image having the horizontal or vertical polarization characteristics and the right eye image having the vertical or horizontal polarization characteristics are simultaneously projected on the screen. At this time, when the viewer wears the polarizing glasses 80 equipped with the polarizer 80a in the vertical direction in the left eye and the polarizer 80b in the horizontal direction in the right eye, the viewer recognizes the separated image for left and right eyes and displays a stereoscopic image. You can watch.

However, in the conventional stereoscopic image projection apparatus, in order to prevent the viewer from recognizing the flicker when stereoscopic projection of the left and right eye image in three dimensions, it must be driven at 50Hz or higher in either channel projector for the left or right eye. In order to implement this in the conventional manner, two projectors are required. The front-end CRT projectors are expensive and therefore expensive to configure such devices, and the bulk of the set is also a problem.

The present invention has been made to improve the above problems, and realize a three-dimensional image without flicker by using a single CRT projector and at the same time the volume is small, three-dimensional image projection apparatus that can be installed anywhere where a general CRT projector is installed The purpose is to provide.

1 is a schematic block diagram of a conventional stereoscopic image projection apparatus,

2 is a schematic block diagram of a stereoscopic image projection apparatus according to the present invention.

<Description of the code | symbol about the principal part of drawing>

10. Video signal input 20. Odd / even field separator

30a. Odd Field Signal Processing Unit 30b. Even field signal processor

40a. CRT projector for odd field imaging 40b. CRT projector for even field imaging

50a, 50b. Projection Lens 60a, 60b. Linear polarizer

70. Screen 80. Polarized Glasses

100. Video signal input 200. Odd / even field separator

300a. Odd field signal processor 300b. Even field signal processor

400. Red, green, blue signal separator 500. Red, green, blue synchronization signal input

600. CRT Projector 700. Projection Lens

800. LCD shutter 900. Sync signal processor

1000. LCD shutter drive unit 1100. Screen

1200. Polarized Glasses

In order to achieve the above object, a stereoscopic image projection apparatus according to the present invention, an image signal input unit for providing an image signal; An odd / even field separator for separating each frame of the video signal into an odd field and an even field, respectively, so as to be used as video field signals for left and right eyes; An odd field signal processor configured to process odd field image signals separated by the odd / even field separators; An even field signal processor processing the even field image signal separated by the odd / even field separator; A red, green, and blue signal separator for separating the odd and even field video signals into red, green, and blue color signals; A red, green, and blue synchronization signal input unit which provides a synchronization signal to the red, green, and blue color signals; A CRT projector for projecting red, green, and blue images according to the red, green, and blue color signals to which the synchronization signal is applied; Red, green, and blue projection lenses disposed in front of the CRT projector to focus and project the red, green, and blue images projected from the CRT projector; A liquid crystal light shutter for controlling projection of each of the red, green, and blue images; A synchronization signal processor which receives and processes a synchronization signal of a field from the odd field signal processor or the even field signal processor; A liquid crystal shutter driver which controls opening and closing of the liquid crystal optical shutter according to a synchronization signal provided from the synchronization signal processor; A screen for forming the red, green, and blue images projected from the liquid crystal light shutter; And polarized glasses for dividing the image of the odd field and the image of the even field formed on the screen into left and right eyes.

The liquid crystal shutter driver may be configured to synchronize the even and odd fields of the input image signal so that the liquid crystal light shutter is turned on or off with respect to the green image and the red + blue image, or the blue image and the red image. It is formed to be turned on or off with respect to the + green image, or to be turned on or off with respect to the red image and the green + blue image, and in particular, the liquid crystal shutter driver is the red when the even-numbered image signal is input from the synchronization signal processor The liquid crystal shutter installed in front of the blue and blue projection lens is controlled to be "on", and the liquid crystal light shutter in front of the green projection lens is controlled to be "off", and an image signal of an odd field is input from the synchronization signal processor. The liquid crystal light shutter in front of the red and blue projection lenses is controlled to be " off " Preferably, the liquid crystal light shutter in front of the green projection lens is controlled to be “on”, or the liquid crystal shutter driver is provided with the even field image signal from the synchronization signal processor, and the red and blue projection lenses The liquid crystal shutter installed in front is controlled to be "off", and the liquid crystal optical shutter in front of the green projection lens is controlled to be "on", and when the image signal of an odd field is input from the synchronization signal processor, the red and blue colors are used. The liquid crystal light shutter in front of the projection lens is controlled to be "on", and the liquid crystal light shutter in front of the green projection lens is controlled to be "off". In addition, another method of controlling the liquid crystal light shutter by the sum of colors is also preferable. Do.

In the present invention, the polarizing glasses are formed with a linear polarizer having a polarization direction in the horizontal direction for the left eye, and a polarizer having a polarization direction in the vertical direction for the left eye, or a polarization direction in the vertical direction for the left eye. It is preferably formed with a linear polarizer, and the right eye is formed with a polarizer having a polarization direction in the horizontal direction.

Hereinafter, a stereoscopic image projection apparatus according to the present invention will be described in detail with reference to the drawings.

2 is a block diagram schematically illustrating a stereoscopic image projection apparatus according to the present invention. As shown, the stereoscopic image projection apparatus according to the present invention is an image signal input unit 100, odd / even field separation unit 200, odd field signal processing unit 300a, even field signal processing unit 300b, red, green , Blue signal separator 400, red, green, blue sync signal input 500, CRT projector 600, projection lens 700, liquid crystal shutter 800, sync signal processor 900, liquid crystal shutter driver ( 1000 and screen 1100. In addition, polarized glasses 1200 for the viewer are also required.

Here, the image signal input unit 100 provides a composite image signal (or stereoscopic image signal). Each frame of the image input signal applied through the image signal input unit 100 is divided into odd and even field signals so that the odd / even field separator 200 can be used as a video field signal for left and right eyes. . The odd and even fields thus separated are processed by the odd field signal processor 300a and the even field signal processor 300b, respectively, and input to the RGB separator 400. The red, green, and blue color signals of each of the odd field and even field signals are separated by the R, G, and B separators, and the red, green, and blue signals are separated by the R, G, and B sync signal input units. The color synchronizing signal is added to the color signal of and input to the CRT projector 600. A red, green, and blue projection lens 700 is disposed in front of the CRT projector 600. A liquid crystal optical shutter 800 is installed in front of the red, green, and blue projection lens 700 of the CRT projector 600 to synchronize the even and odd fields of the input image signal, thereby synchronizing the green, red, and blue LCDs. The circuit is configured such that the optical shutter 800 is turned on or off. The synchronization signal processor 900 and the LCD optical shutter driver 1000 are provided to drive the LCD optical shutter 800 on or off. Here, when the synchronization signal processor 900 separates the synchronization signal from the odd field signal processor 300a or the even field signal processor 300b and provides it to the LCD optical shutter 1000, the LCD optical shutter 1000 uses the CRT as a reference. Controls the projector to alternately block or project red, green, and blue images projected from the projector 600. This control process is as follows.

First, when an image signal is input from the image signal input unit 100 to the odd / even field separator 200, the odd / even field separator 200 separates each frame of the image signal into an odd field and an even field. Each field signal is separated into the red, green, and blue color signals by the R, G, and B separation unit 400 again, and passes through the R, G, and B synchronization signal input units 500, and the CRT projector with the color synchronization signal. Is entered at 600. In this case, when an even field video signal is input, the liquid crystal shutters installed in front of each of the red and blue projection lenses 700 are turned “on”, and the green shutter is “off”. When an odd field video signal is input, The liquid crystal light shutter 700 in front of the red and blue lenses is "off" and the liquid crystal light shutter 700 in front of the green lens is "on". Here, any method of opening and closing the liquid crystal optical shutter by other color sums in addition to the color sums mentioned above is possible.

In the stereoscopic image projection apparatus configured as described above, when an NTSC signal in which stereoscopic image information is recorded in an odd field or an even field is sequentially generated and an odd or even field image signal is sequentially generated, the viewer may display an odd field image signal. The left eye recognizes the image with red + blue color, and the right eye recognizes the image with red green color.When the video signal of even field is displayed, the left eye recognizes the image with green color. In the right eye, images with red + blue colors are sequentially viewed. In this case, both eyes can watch 60 frames of video per second, thereby watching stereoscopic images without flicker. Here, the polarizing glasses 1200 for viewers are formed with a linear polarizer having a polarization direction in the vertical direction of the left eye 1200a, and a polarizer having a polarization direction in the vertical direction for the left eye 1200a. The 1200a may be formed as a linear polarizer having a polarization direction in the horizontal direction, and the right eye 1200b may be formed as a polarizer having a polarization direction in the vertical direction.

As described above, the stereoscopic image projection apparatus according to the present invention separates R, G, and B color signals from each of the odd and even field image signals separated by using one CRT projector and a liquid crystal optical shutter, and synchronizes the color signals. By alternately projecting or blocking using signals, the left and right eye images of 50 Hz or more are displayed to realize a three-dimensional image without flicker. Therefore, one CRT projector can be configured to have a high-performance three-dimensional image projector at a relatively low cost, and also has a small volume can be installed anywhere where a general CRT projector is installed.

Claims (11)

An odd / even field separator for separating each frame of the input video signal into an odd field and an even field so as to be used as a video field signal for left and right eyes; An odd / even field signal processor configured to process odd or even field image signals separated by the odd / even field separator; A red, green, and blue signal separator for separating the odd and even field video signals into red, green, and blue color signals; A red, green, and blue synchronization signal input unit which provides a synchronization signal to the red, green, and blue color signals; A CRT projector for projecting red, green, and blue images according to the red, green, and blue color signals to which the synchronization signal is applied; Red, green, and blue projection lenses disposed in front of the CRT projector to focus and project the red, green, and blue images projected from the CRT projector; A liquid crystal light shutter for controlling projection of each of the red, green, and blue images; A synchronization signal processor which receives and processes a synchronization signal of a field from the odd field signal processor or the even field signal processor; A liquid crystal shutter driver which controls opening and closing of the liquid crystal optical shutter according to a synchronization signal provided from the synchronization signal processor; And A screen for forming the red, green, and blue images projected from the liquid crystal light shutter; Three-dimensional image projection device characterized in that provided. The method of claim 1, And the liquid crystal shutter driver is configured to synchronize the even and odd fields of the input image signal so that the liquid crystal light shutter is turned on or off for the green image and the red + blue image. The method of claim 2, The liquid crystal shutter driver controls the liquid crystal shutter installed in front of the projection lens for red and blue to be “on” when an image signal of an even field is input from the synchronization signal processor, and the liquid crystal in front of the green projection lens. The optical shutter is controlled to be "off", and when the image signal of the odd field is input from the synchronization signal processor, the liquid crystal optical shutter in front of the red and blue projection lenses is controlled to be "off" and the front of the green projection lens is controlled. And the liquid crystal light shutter is controlled to be " on ". The method of claim 2, The liquid crystal shutter driver controls the liquid crystal shutter installed in front of the projection lens for red and blue to be “off” when an image signal of an even field is input from the synchronization signal processor, and the liquid crystal light in front of the green projection lens. The shutter is controlled to be "on", and when the image signal of an odd field is input from the synchronization signal processor, the liquid crystal light shutter in front of the red and blue projection lenses is controlled to be "on" and the front of the green projection lens is controlled. And the liquid crystal light shutter is controlled to be " off ". The method of claim 1, And the liquid crystal shutter driver is configured to synchronize the even and odd fields of the input image signal so that the liquid crystal light shutter is turned on or off for the blue image and the red + green image. The method of claim 5, The liquid crystal shutter driver controls the liquid crystal shutter installed in front of the projection lens for red and green to be “on” when an image signal of an even field is input from the synchronization signal processor, and the liquid crystal light in front of the blue projection lens. The shutter is controlled to be "off," and when the image signal of an odd field is input from the synchronization signal processor, the liquid crystal light shutter in front of the red and green projection lenses is controlled to be "off" and the front of the blue projection lens is controlled. And the liquid crystal light shutter is controlled to be " on ". The method of claim 5, The liquid crystal shutter driver controls the liquid crystal shutter installed in front of the projection lens for red and green to be “off” when an image signal of an even field is input from the synchronization signal processor, and the liquid crystal light in front of the blue projection lens. The shutter is controlled to be "on", and when the image signal of an odd field is input from the synchronization signal processor, the liquid crystal light shutter in front of the red and green projection lenses is controlled to be "on" and the front of the blue projection lens is controlled. And the liquid crystal light shutter is controlled to be " off ". The method of claim 1, And the liquid crystal shutter driver is configured to synchronize the even and odd fields of the input image signal so that the liquid crystal light shutter is turned on or off with respect to the red image and the green + blue image. The method of claim 8, The liquid crystal shutter driver controls the liquid crystal shutter installed in front of the projection lens for green and blue to be “on” when an image signal of an even field is input from the synchronization signal processor, and the liquid crystal light in front of the red projection lens. The shutter is controlled to be "off," and when the image signal of an odd field is input from the synchronization signal processor, the liquid crystal light shutter in front of the green and blue projection lens is controlled to be "off" and the front of the red projection lens is controlled. And the liquid crystal light shutter is controlled to be " on ". The method of claim 8, The liquid crystal shutter driver controls the liquid crystal shutter installed in front of the projection lens for green and blue to be “off” when an image signal of an even field is input from the synchronization signal processor, and the liquid crystal light in front of the red projection lens. The shutter is controlled to be "on", and when the image signal of an odd field is input from the synchronization signal processor, the liquid crystal light shutter in front of the green and blue projection lens is controlled to be "on" and the front of the red projection lens is controlled. And the liquid crystal light shutter is controlled to be " off ". The method of claim 1, Polarizing glasses for dividing the image of the odd field and the image of the even field formed on the screen into left and right eyes are further provided, wherein the polarizing glasses are formed of linear polarizers having a polarization direction in the horizontal direction and for the right eye. Or a left polarizer formed of a linear polarizer having a polarization direction in a vertical direction, and a right eye formed of a polarizer having a polarization direction in a horizontal direction.