JPH0720430A - Display device - Google Patents

Abstract

PURPOSE:To expand the range of use of the display device by adding a monitoring function to an OHP device. CONSTITUTION:The case that a video light formed by a display image forming means 16 for forming a video light in accordance with a specified driving signal is image-formed on a stage 2 and the image of a document and/or the display image of the video light is projected to a projection screen 6 or the case that the display image of the video light is displayed on a half-transparent screen arranged instead of the stage 2 is selected and thus a function as a monitoring device is added to a display device 10 in addition to a conventional OHP device, the range of use is expanded and handleability is greatly improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device, particularly
It is suitable for application to an HP (Over Head Projector) device.

[0002]

2. Description of the Related Art Conventionally, OHP devices have been widely used in conferences, presentations, etc., and as shown in FIG. 5, a manuscript made of a transparent sheet on which characters and charts (hereinafter referred to as source images) are written. Original placement surface 2 formed on one surface of the Fresnel lens 2
The light source light emitted from the light source 3 is placed on A, and the original light is applied to the original through the Fresnel lens 2. At this time, the image light formed by the light transmitted through the original is projected lens 4 and reflection mirror
The original image of the original is enlarged and displayed on the projection screen 6 by projecting the original image on the projection screen 6 via the.

Conventionally, there is also an OHP device for enlarging and displaying a computer image based on the output from the computer on a projection screen. That is, this type of OHP device
The output from the computer is input to the transmissive liquid crystal display panel placed on the original placement surface, and the transmissive liquid crystal display panel is driven by the input signal from this computer to enlarge the computer image on the projection screen. It is designed to be displayed.

[0004]

By the way, the conventional OH
In the P device, there is no method of use other than enlarging and displaying the image of the manuscript or the computer on the projection screen, and as a result, the use range of the OHP device is limited to a very narrow range such as a conference or a presentation. The usage frequency was also limited.

The present invention has been made in consideration of the above points, and it is an object of the present invention to propose a display device which has a wider range of use by increasing the display function of the OHP device and which has improved usability.

[0006]

In order to solve such a problem, according to the present invention, in a display device 10 for projecting a document placed on a predetermined stage 2 onto a projection screen 6, irradiation light for illuminating the document is provided. A light source 3 to be generated and a display image forming means 1 for forming image light according to a predetermined drive signal.
6, and a condensing unit 17 for condensing the image light formed by the display image forming unit 16 to form a display image of the image light on the stage 2, and instead of or on the stage 2. Semi-transparent screen 18 selectively placed
For projecting an image of a document and / or a display image of video light on the projection screen 6, or the translucent screen 1
A case where a display image of video light is displayed on 8 is selected.

Further, in the present invention, the display image forming means 16 is composed of an optical spatial modulator. Further, in the present invention, the display image forming means 16 is made of transmissive liquid crystal. Further, in the present invention, the display device 1
In the case of 0, the image of the original and the display image of the video light are superimposed and projected on the projection screen 6.

[0008]

The stage 2 outputs the image light formed by the display image forming means 16 which forms the image light according to a predetermined drive signal.
The display device can be selected by projecting the image of the original and the display image of the video light on the projection screen 6 or displaying the display image of the video light on the semitransparent screen 18. The function as a monitor device can be added to the function of the conventional OHP device, so that the range of use can be expanded and the usability can be significantly improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, reference numeral 10 denotes a display device as a whole, which comprises a device main body 11 and a projection section 12, and
The output from the computer 13 can be input to the apparatus main body 11. Further, in the display device 10,
The projection unit 12 can be detached from the device body 11.

Inside the apparatus body 11, as shown in FIG. 2, a transmissive liquid crystal 16 is provided between the light source 3 and the Fresnel lens 2.
And a condenser lens 17 are provided. As a result, in the display device 10, by inputting the output of the computer 13 to the transmissive liquid crystal 16, the transmissive liquid crystal 16 is driven according to the output of the computer 13, and at the same time, an image formed of light transmitted through the transmissive liquid crystal 16 Light condensing lens 17
An image is formed at the position of the Fresnel lens 2 via. Here, the transmission type liquid crystal device 16 is provided with a micro color filter (not shown) so that a color image based on the output of the computer 13 is formed at the position of the Fresnel lens 2. .

As a result, in the display device, as shown in FIG. 3, the Fresnel lens 2 is placed at the position of the Fresnel lens 2.
Replaced with a translucent screen for rear projection 1
By attaching 8, the computer image corresponding to the input signal from the computer 13 can be displayed on the display surface 18A of the semitransparent screen 18.

In the above structure, when the display device 10 is desired to be used like a normal OHP device, a transparent sheet of a document is placed on the document placing surface 2A and the transmissive liquid crystal 16 is set in the total transmission mode. , The light source light emitted from the light source 3 is set to the transmissive liquid crystal 16 set to the total transmission mode,
The document is illuminated through the condenser lens 17 and the Fresnel lens 2. As a result, the image light, which is the transmitted light of the document, is enlarged and displayed on the projection screen 6 via the projection lens 4 and the reflection mirror 5.

On the other hand, when the image of the computer 13 is displayed at the position of the Fresnel lens 2, the output of the computer 13 is input to the transmissive liquid crystal 16 to drive the transmissive liquid crystal 16 and the Fresnel. A semitransparent screen 18 is attached to the position of the lens 2 in place of the Fresnel lens 2. At this time, the transmissive liquid crystal 16 from the light source 3
By irradiating the light source light on the image light, the image light, which is the light transmitted through the transmissive liquid crystal 16, is imaged on the semitransparent screen 18, and accordingly, based on the output from the computer 13 on the display surface of the semitransparent screen 18. The computer image is displayed. At this time, the display device 10 can be used as a monitor by removing the projection unit 12 from the device body 11, as shown in FIG.

In the display device 10, when a document is placed on the document placing surface 2A and the transmissive liquid crystal 16 is driven by the output from the computer 13, the light source 3 emits light. The image light, which is the light transmitted through the transmissive liquid crystal 16, once forms an image on the original document mounting surface 2A, and the same state as when two originals are mounted on the original document mounting surface 2A is obtained. As a result, an enlarged image in which the original image and the computer image are superimposed is displayed on the projection screen 6.

As described above, in the display device 10, the function of projecting the enlarged image of the original document on the projection screen 6, the function of superimposing the enlarged image of the original document and the computer image on the projection screen 6, or the semitransparent screen of the computer image. The functions displayed on the screen 18 can be selected.

According to the above construction, the transmissive liquid crystal 16 driven by the output of the computer 13 is disposed between the light source 3 and the Fresnel lens 2, and the image light formed by the transmissive liquid crystal 16 is placed on the original. By forming an image at the position of the mounting surface 2A, it is possible to realize the display device 10 in which the range of use is expanded and the usability is remarkably improved.

In the above-described embodiment, the transmissive liquid crystal 16 is provided, and the transmissive liquid crystal 16 is driven by the output signal from the computer 13, so that the image light corresponding to the signal output from the computer 13 is generated. However, the present invention is not limited to this, and as the display image forming means for forming the image light according to the output signal from the computer 13, for example, minute elements are arranged in a plane and each element is arranged. An optical spatial modulator (for example, a light valve) utilizing the difference in transmission or reflection of light may be used, and various display image forming means capable of forming image light based on a signal from an external device such as a computer may be used. Can be used.

Further, in the above-described embodiment, the image light, which is the transmitted light of the transmissive liquid crystal 16, is condensed by the condenser lens 17 so that the image light is imaged at the position of the Fresnel lens 2. However, the present invention is not limited to this, and the condensing lens 17 may be omitted if the display image forming means for forming the image light itself has a condensing means therein. You can

Further, in the above-mentioned embodiment, the case where the Fresnel lens 2, the projection lens 4 and the reflection mirror 5 are used has been described, but the present invention is not limited to this, and the point is that the image of the original and the image of the transmissive liquid crystal 16 are essential. Anything that can project light on the projection screen 6 may be used.

Further, in the above embodiment, when the display device 10 is used as a monitor, the Fresnel lens 2 is used.
However, the present invention is not limited to this, and the semitransparent screen 18 may be attached to the Fresnel lens 2.

[0022]

As described above, according to the present invention, a display image forming means for forming image light according to a predetermined drive signal,
Condensing means for forming a display image of the image light on the stage by condensing the image light formed by the display image forming means, and a semi-optically arranged half instead of the stage or on the stage. By providing a transparent screen and selecting the case of projecting the image of the original and / or the display image of the video light on the projection screen and the case of displaying the display image of the video light on the semi-transparent screen, OHP
It is possible to add a function as a monitor device in addition to the function of the device, and thus it is possible to realize a display device with significantly improved usability.

[Brief description of drawings]

FIG. 1 is a perspective view showing an appearance of an embodiment of a display device according to the present invention.

FIG. 2 is a schematic side view showing the overall configuration of an embodiment of a display device according to the present invention.

FIG. 3 is a schematic side view for explaining the operation of the display device according to the present invention.

FIG. 4 is a front view showing a case where the display device according to the present invention is used as a monitor.

FIG. 5 is a schematic side view showing a configuration of a conventional OHP device.

[Explanation of symbols]

1 ... OHP device, 2 ... Fresnel lens, 2A ... Original placement surface, 3 ... Light source, 4 ... Projection lens, 5 ... Reflection mirror, 6 ... Projection screen, 10 ... Display device, 1
1 ... Device body, 12 ... Projector, 13 ... Computer, 16 ... Transmissive liquid crystal, 17 ... Condensing lens, 18 ...
… Semi-transparent screen.

Claims (4)

[Claims] 1. A display device for projecting an original document placed on a predetermined stage onto a projection screen, wherein a light source for generating irradiation light for irradiating the original document and image light according to a predetermined drive signal are formed. In place of the display image forming means, a condensing means for focusing the image light formed by the display image forming means on the stage to form a display image of the image light on the stage, or A semi-transparent screen selectively disposed on the stage, wherein the image of the original document and / or the display image of the video light is projected onto the projection screen; A display device, characterized in that a case of displaying the display image is selected. 2. The display device according to claim 1, wherein the image forming means is an optical spatial modulator. 3. The display device according to claim 1, wherein the image forming means is made of a transmissive liquid crystal. 4. The display device according to claim 1, wherein the display device is configured to project the image of the original document and the display image of the video light in an overlapping manner on the projection screen.