JPH0617385Y2 - Image display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an image display device, and more particularly to an image display device capable of obtaining an image with high resolution.

[Prior Art and Problems to be Solved] Conventionally, in order to obtain a large-screen or multi-pixel display image, an image display device in which a plurality of CRTs are arranged has been proposed. However, in such an image display device,
There is a problem that a grid-like gap is formed between the CRTs and it is difficult to see as one continuous image.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an image display device capable of obtaining an image with high resolution without increasing the number of pixels and without seeing a grid.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention guides an image displayed on a display unit and an image displayed on the display unit to n display areas that are displaced from each other. Optical means for controlling the display means, display control means for displaying an image of n screens in one field period on the display means, and light guide from the display means to the n display areas in synchronization with the display control means. A shutter means for opening one of the optical paths in a time division manner is provided.

[Operation] With this configuration, the display image is guided by the optical unit to the n display regions that are displaced from each other, and
Since the display is time-divided into the n display areas during the cycle, the number of pixels can be substantially increased by n times, and the grid-like gaps are not visible.

[Embodiment] An embodiment will be described below with reference to the drawings, taking the case where the present invention is applied to an image display device as an example.

Configuration FIG. 1 and FIG. 2 are basic configuration diagrams of the image projection apparatus. In the figure, 1 is a CRT display (display device),
Images such as television images are displayed at 4 frames at 60Hz or higher. That is, if one field of the television image is 1/60 sec, four screens are displayed during this one field period. In other words, the display device 1 displays one image at four times 240 Hz (240 fields /
sec) to display continuously. An optical shutter 3 and an optical lens unit 4 are arranged on the optical path 2 in front of the display device 1, and a screen 5 is arranged further in front of the optical lens unit 4. And CRT
The image displayed on the display 1 is divided into four vertically and horizontally by the optical shutter 3 and the optical lens unit 4 and enlarged and projected. That is, the optical lens unit 4 has the third
As shown in FIG. 4 and FIG. 4, four lenses 4a to 4d are attached to the lens attachment plate 6 via the attachment tube 6a,
The image displayed on the CRT display 1 is magnified and projected on the I to IV portions of the screen 5 which are divided into four by the lenses 4a to 4d. In this case, each lens 4a-
4d is a combination of a plurality of lenses, and of these lenses 4a to 4b, for example, the lens 4a projects an image on the I portion of the screen 5, the lens 4b on the II portion, the lens 4c on the III portion, and the lens 4c. 4d projects an image on each IV portion. The optical shutter 3 is composed of a PLZT element, and shutter portions 3a ... Are formed in portions of the optical lens portion 4 corresponding to the respective lenses 4a-4b. By electrically driving the shutter portions 3a. The light transmission state of 3a ... sequentially switches at 240 Hz. The optical shutter 3 is the CRT display 1
It is provided on the side surface through a mask 7 that blocks excess light. The PLZT element is a ceramic device obtained by sintering Pb (lead), La (lanthanum), Zr (zirconium), and Ti (titanium).

FIG. 5 is a block diagram showing a circuit configuration of the image projection apparatus as described above. In the figure, 10 is a sync separation circuit, which receives a video signal, separates a horizontal sync signal and a vertical sync signal based on the input signal, and outputs each signal to a horizontal oscillator 11 and a vertical oscillator 12. The horizontal oscillator 11 automatically controls the frequency based on the horizontal sync signal from the sync separation circuit 10, and supplies a horizontal deflection signal to the CRT display 1 via the horizontal driver 13 and the horizontal output section 14.
The vertical oscillator 12 gives a vertical deflection signal to the CRT display 1 via the vertical driver 15 and the vertical output unit 16 based on the vertical signal from the sync separation circuit 10 and also gives a shutter synchronizing signal to the shutter driver 17. A video signal is given to the electron gun through the video amplifier 18 and the video output unit 19 to the CRT display 1, and one frame image is generated every 240 Hz based on the deflection signals from the horizontal output unit 14 and the vertical output unit 16. Are sequentially displayed at designated positions. The shutter driver 17 drives the optical shutter 3 based on the shutter synchronizing signal from the vertical oscillator 12, and sequentially switches each shutter unit 3a of the optical shutter 3 at 240 Hz. The optical shutter 3 is the shutter driver 1
When the shutter portions 3a ... Are sequentially switched by 7, the CRT
The images displayed on the display 1 project four images vertically and horizontally on the screen 5 via the optical lens unit 4.

Operation Next, a case where an image is projected on the screen 5 by the image projection device configured as described above will be described.

When the video signal is applied to the sync separation circuit 10 and the video amplification section 18, the sync separation circuit 10 causes the horizontal oscillator 11,
A horizontal deflection signal is given to the CRT display 1 through the horizontal driver 13 and the horizontal output section 14, and a vertical deflection signal is given to the CRT display 1 through the vertical oscillator 12, the vertical driver 15, and the vertical output section 16, and A shutter synchronization signal is given from the vertical oscillator 12 to the shutter driver 17. At the same time, the video amplifier 1
CRT display 1 from 8 through video output unit 19
A video signal is given to. Then, an image of one frame is sequentially displayed on the CRT display 1 at a specified position every 240 Hz. At the same time, the optical shutter 3 is driven by the shutter driver 17, and the transmission state of the shutter portions 3a ... Of the portions corresponding to the lenses 4a to 4d of the optical lens portion 4 is sequentially switched at 240 Hz.

In this way, when the shutter portions 3a ... Of the optical shutter 3 are sequentially switched, the image displayed on the CRT display 1 is sequentially enlarged and projected onto a predetermined position on the screen 5 via the optical shutter 3 and the optical lens portion 4. It That is,
First, when the shutter portion 3a of the shutter portion 3a of the optical shutter 3 corresponding to the upper right lens 4a of the optical lens portion 4 shown in FIG. 1 is opened, as shown in FIG.
The first image displayed on the RT display 1 is magnified and projected on the upper right portion I of the screen 5 by the lens 4a through the shutter portion 3a in the transmissive state. In this state, the other shutter parts 3a ... Of the optical shutter 3 are not open (not in the transmissive state), so that the other II-IV of the screen 5 are
No image is projected on the part. Then, when the shutter portion 3a is closed and the shutter portion 3a corresponding to the lower right lens 4b is opened, this time, as shown in FIG.
The image displayed on the T display 1 is switched, and the switched second image is in a transmissive state.
It is enlarged and projected on the part. Also in this case, the image is not projected on the other I, III and IV portions of the screen 5. Hereinafter, when the shutter portions 3a, 3a of the optical shutter 3 are sequentially switched and opened, the third and fourth portions displayed on the CRT display 1 are displayed.
Each image is sequentially projected on the III and IV portions of the screen 5. This completes one cycle. In this way, the first to fourth images are enlarged and projected on the I to IV portions of the screen 5 at 240 Hz intervals, and when one cycle ends at 60 Hz, four frames of images are displayed due to the afterimage phenomenon of the human eye. Seen as one magnified image.

However, according to the image projection apparatus as described above, the CRT
Since the images displayed on the display 1 are sequentially arranged on the screen 5 by the lenses 4a to 4d of the optical lens unit 4 which are sequentially switched and selected by the optical shutter 3 and enlarged and projected, a large image with high resolution is clearly projected. In addition, a good image can be obtained without a gap between the four images enlarged and projected on the screen 5.

Although the CRT display 1 is used as a display device in the above-described embodiments, the present invention is not limited to this, and a liquid crystal display device having a light source on the back side may be used, and the optical shutter 3 is not limited to a PLZT element, A high-speed liquid crystal shutter or a mechanical shutter used in a camera or the like may be used.

Further, in the above-described embodiment, four images are arranged on the screen 5 and enlarged and projected, but the present invention is not limited to this.
If one cycle is 60 Hz or more, n images can be arranged and projected in an enlarged manner.

[Advantages of the Invention] As described in detail above, according to the present invention, the display means for displaying an image and the image displayed by the display means are guided to n display areas that are displaced from each other. Means for displaying the image of n screens in one field period on the display means, and a light guide optical path from the display means to the n display areas in synchronization with the display control means. Since one of them is provided with a shutter unit that opens in a time-division manner, the number of pixels can be substantially increased by n times, and a grid-like gap is not visible, so that an image with high resolution can be obtained. .

[Brief description of drawings]

1 to 5 show an embodiment of the present invention, FIG. 1 is a perspective view showing the basic structure of an image projection apparatus, FIG. 2 is its side view, and FIGS. 3 and 4 are optical shutters. FIG. 5 is a block diagram showing the circuit configuration of the image projection device, and FIG. 1 ... CRT display, 3 ... Optical shutter, 4 ...
Optical lens part, 5 ... Screen.

Claims (1)

[Scope of utility model registration request] 1. Display means for displaying an image, and optical means for guiding an image displayed by the display means to n (n is an integer of 2 or more) display areas which are displaced from each other and do not overlap each other. A display control means for displaying different screen images on the display means during one field period; and a light guide optical path from the display means to the n display areas in synchronization with the display control means. An image display device comprising: an optical shutter unit, one of which is opened in a time division manner.