JP2571460Y2 - LCD projector - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal projector for displaying an output signal of a computer on a liquid crystal panel and enlarging the image.

[0002]

2. Description of the Related Art Conventional liquid crystal display devices for projection are roughly classified into the following groups. That is,
[1] a liquid crystal projection device that is integrated by incorporating a liquid crystal panel together with a light source and a lens system for enlargement;
[2] A liquid crystal display device can be attached to and detached from a projector having a light source and a lens system for enlargement.

Further, the method of [2] is classified into the following two methods. That is, [2-A] a system in which an OHP (over head projector) is used as a projector and a liquid crystal display device is placed instead of a document, and [2-B] a slide projector is used as a projector and a slide film is used instead of a slide film. And a method of mounting a liquid crystal display device.

A liquid crystal projection device of the type [1] and [2-A]
Is currently being commercialized. A liquid crystal display device of the [2-B] system is described in Japanese Utility Model Application No. 63-98645.

[0005]

In recent years, with the spread of small portable computers, there has been a tendency for peripheral devices to be downsized. When a liquid crystal display device is used as a peripheral device of a computer or as a presentation tool, portability and operability are also emphasized.

However, since the liquid crystal projection device of the type [1] has a large volume and a large weight, it is used as a stationary type and is not usually carried. Since the liquid crystal display device of [2-A] is used in place of an OHP document, an A4 size liquid crystal panel is required. But,
Since the liquid crystal panel is large, portability is extremely poor. However, although the liquid crystal display device of [2-B] is excellent in portability, it must always be used with a slide projector.

[0007] An object of the present invention is to provide a liquid crystal projector with improved operability, which has good portability and can be used as a stationary type.

[0008]

In order to achieve the above object, the present invention provides a body having a light source, a lens and a polarizing plate,
Having a liquid crystal panel, a control circuit, and a polarizing plate, a liquid crystal projection device is configured by a display unit that can be attached to and detached from the main body,
A display unit can be mounted between the light source and the lens, and a polarizing plate is installed between the display unit and the light source.The display unit has a liquid crystal panel and a control circuit in a housing consisting of a panel storage and a control circuit storage. The liquid crystal panel is housed and the polarizing plate is placed on both sides of the display surface of the liquid crystal panel. Further, holding portions for attaching and detaching the display unit from the main body are provided at both ends of the liquid crystal panel housing portion along the attaching / detaching direction. The thickness of the portion is 6 mm or less, and the width of the liquid crystal panel storage portion including the holding portion is approximately 50 mm.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an external view showing a first embodiment of the liquid crystal projection device of the present invention. In FIG. 1, a liquid crystal projection device includes a main body 1.
00 and a display unit 200. . The main body 100 includes a lens 101 and a light source, and uses a metal halide lamp as the light source.
The display unit 200 includes a control circuit storage unit 210 and a liquid crystal panel storage unit 220. Rotation support part 23
Numerals 0 and 240 are provided for rotating the control circuit storage unit 210 with respect to the liquid crystal panel storage unit 220.
The external connector 201 is connected to the image signal output unit 501 of the computer 500 via the cable 520. The image signal of the computer 500 is stored in the control circuit housing 2
10 and processed by the control circuit in the LCD panel storage section 220.
The image is displayed on the liquid crystal panel in
01 and a light source are used for enlarged projection. Further, the display unit 200 has a luminance volume 202 for changing the brightness of the liquid crystal display, and a power switch 203.

FIG. 2 is an external view showing a display unit constituting a first embodiment of the liquid crystal projection device of the present invention. FIG.
FIG. 2 is an external view showing a main body constituting a first embodiment of the liquid crystal projection device of the present invention. 2 and 3, FIG.
The same reference numerals indicate the same items. The display unit and its attachment / detachment will be described with reference to FIGS.

At the center of the liquid crystal panel housing 220, a windshield 250 made of a transparent acrylic plate is arranged. The holding portions 221 are provided on both sides of the windshield 250 so that the holding portions 221 can be fixed to the main body 100 and can be mounted on a general slide projector using a 50 mm square mount frame. Therefore, the width W of the panel storage section is set to approximately 50 mm, and the thickness t of the holding section is set to 6 mm or less. The main body 100 is provided with grooves 120 for fixing the holding portions 221 respectively. As a structure for fixing the holding portion 221, a spring or the like may be provided on the main body 100.

FIG. 4 is a diagram schematically showing the interrelationship between the components of the liquid crystal projection device of the present invention. In FIG. 4, the same reference numerals as those in FIG. 1 indicate the same parts. The display unit 200 houses the liquid crystal panel 300 and the control circuit 400, and includes a draft shield 250 and a draft shield 260.
The polarizer 2 on the side facing the liquid crystal panel 300
51 and 261 are attached. Further, the light source 10
A polarizing plate 105 is also provided between 2 and the display unit 200,
The direction of the absorption axis is the same as that of the polarizing plate 261. Since the light source 102 of the main body 100 uses a metal halide lamp, the brightness is high. Therefore, the polarizing plate 105
By installing a display having a relatively high transmittance even though the transmittance is relatively low, the contrast of the liquid crystal display when the display unit 200 is mounted on the main body 100 and used can be increased. On the other hand, by installing a polarizing plate 261 having a higher transmittance even though the polarizing ratio is relatively low, the polarizing plate 261 can be mounted on a general slide projector using a halogen lamp having a lower luminance than a metal halide lamp. When used, liquid crystal display can be performed with priority given to brightness.

FIG. 5 is an external view showing a liquid crystal panel constituting the liquid crystal projection device of the present invention. The liquid crystal panel 300
Liquid crystal is sealed between a glass 310 on which a scanning electrode is patterned and a glass 320 on which a signal electrode is patterned. The circuit for display is COG (chip
It is implemented using the (on-glass) method. That is, the scanning circuit chip 311 is connected to the glass 310 and the signal circuit chip 321 is connected to the glass 320 by paste. The connection from the control circuit board to the scanning circuit chip 311 and the signal circuit chip 321 is made via the flexible printed circuit board 330.

FIG. 6 is an external view showing a second embodiment of the liquid crystal projection device of the present invention, and FIG. 7 is an external view showing a display unit constituting the embodiment. 6 and 7, the same reference numerals as those in FIGS. 1 and 2 indicate the same parts. Display unit 20 shown in FIG.
0 changes the shape of the control circuit storage section 210 from that of FIG. In FIG. 6, the display unit 200 only needs to be inserted perpendicularly to the upper surface of the main body 100, and therefore does not have a rotating support. Notches 205 and 206 are provided on the upper surface of the main body 100 so that the display unit 200 can be easily inserted and removed.

[0015]

As is apparent from the above description, according to the present invention, not only can the liquid crystal projector be used as a stationary type, but also the display unit can be taken out and inserted into a general slide projector as required. Since it can be used, the added value of the device can be dramatically increased. For example, an office uses a stationary type to prepare presentations for explanations to customers, and when traveling, simply bring a display unit and a floppy disk to the customer, and slide projectors at the customer's site And give a presentation using a computer. Thus, the operability and portability are extremely good. At present, when a better presentation is desired, the role of the liquid crystal projection device of the present invention plays an extremely large role.

According to the present invention, when the display unit is mounted on the main body and used, the contrast of the liquid crystal display is enhanced in consideration of the characteristics of the metal halide lamp, the liquid crystal and the polarizing plate. When mounted on a general slide projector using a halogen lamp with relatively low brightness, the brightness of the liquid crystal display can be prioritized, so that the display according to the situation is always performed be able to. Furthermore, since the polarizing plate absorbs about 50% of the incident light and generates heat, when using a high-luminance metal halide lamp, the polarizing plate, on which light is first incident, is separated from the liquid crystal panel. Temperature can be prevented.

Furthermore, as shown in the first embodiment, the liquid crystal projection device can be made compact by providing the display unit with a rotating support portion, and bending and mounting the display unit on the main body.

[Brief description of the drawings]

FIG. 1 is an external view showing a first embodiment of the liquid crystal projection device of the present invention.

FIG. 2 is an external view showing a display unit constituting a first embodiment of the liquid crystal projection device of the present invention.

FIG. 3 is an external view showing a main body constituting a first embodiment of the liquid crystal projection device of the present invention.

FIG. 4 is a diagram schematically showing the interrelation of each component constituting an embodiment of the liquid crystal projection device of the present invention.

FIG. 5 is an external view showing a liquid crystal panel constituting an embodiment of the liquid crystal projection device of the present invention.

FIG. 6 is an external view showing a second embodiment of the liquid crystal projection device of the present invention.

FIG. 7 is an external view showing a display unit constituting a second embodiment of the liquid crystal projection device of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 body 101 lens 102 light source 200 display unit 210 control circuit storage unit 220 liquid crystal panel storage unit 221 holding unit 230 rotation support unit 240 rotation support unit 300 liquid crystal panel 400 control circuit

Claims (2)

(57) [Scope of request for utility model registration] 1. A liquid crystal projection device comprising a light source, a lens, a liquid crystal panel, a polarizing plate, and a control circuit for driving the liquid crystal panel, wherein the liquid crystal projection device comprises:
A main unit including the lens, a polarizing plate, the liquid crystal panel, the control circuit, and a polarizing plate, including a display unit detachable from the main body, wherein the main body includes the light source and the lens. The display unit can be mounted therebetween, and a polarizing plate is provided between the mounted display unit and the light source. And a polarizing plate provided on both sides of the display surface of the liquid crystal panel, and further, holding portions for attaching and detaching the display unit to and from the main body at both ends of the liquid crystal panel accommodating portion along the attaching / detaching direction. A liquid crystal projection device, wherein the thickness of the holding portion is 6 mm or less, and the width of the liquid crystal panel storage portion including the holding portion is approximately 50 mm. 2. The liquid crystal projection device according to claim 1, wherein the display unit is provided with a rotation support portion for rotating the control circuit storage portion with respect to the liquid crystal panel storage portion.