JPH01244438A - electronic overhead projector equipment - Google Patents

Abstract

PURPOSE:To obtain a bright, magnified, projected image of good contrast by arranging an optical system, liquid crystal for direct viewing and liquid crystal for magnifying and projecting in a device. CONSTITUTION:To produce display data, a keyboard 34 is removed from the recessed part 11 of a main body 10, and the display data is inputted through the keyboard 34. The data is displayed on a 2nd liquid crystal display 14 made of TN- or STN-liquid crystal, which is suitable for directly viewing the screen. The inputted data is recorded on a floppy disk through an FDD 38 built-in the side of the keyboard 34. In case of magnified projection, a lamp house 24 is turned upward about the main body 10, and fixed. The floppy disk recording the display data is inserted into the FDD 38, and is displayed on a 1st liquid crystal display 12 suitable for magnified projection through a remote- control device 40, and the screen is controlled by magnifying and projecting said data.

Description

[Detailed Description of the Invention] Regarding an electronic overhead projector (hereinafter referred to as an OHP device) with a summary display data creation function, we provide an electronic OHP device that has a built-in data creation device and is capable of obtaining a bright, high-contrast enlarged projected image. It has a first liquid crystal display composed of a reflector, a phase change liquid crystal, and a Fresnel lens on the front surface, and a second liquid crystal display composed of a TN type or STN type liquid crystal on the back side of the first liquid crystal display. A main body having a liquid crystal display, a keyboard containing a recording medium, electrically connected to first and second liquid crystal displays of the main body, and detachably attached to the main body, a light source lamp, a projection lens, and a projection mirror. and a lamp house rotatably attached to the main body.

The present invention relates to an electronic HP device (hereinafter referred to as an HP device), and particularly to an electronic HP device with a display data creation function.

○HP equipment is a device for enlarging and projecting a display image formed on a ○HP sheet etc. onto a screen, and because it can explain to a large audience while showing the enlarged image projected on the screen, it is useful for meetings, It is often used to enlarge and project images in various presentations such as education. This OHP device consists of: - A lamp house equipped with a light source lamp, a projection lens, and a projection mirror is spaced a predetermined distance from the stage section by an arm on a stage section equipped with a condensing Fresnel lens and a reflection plate. attachment,
The OHP sheet placed on the stage is irradiated with a light source such as a halogen lamp, the light is focused on the projection lens position by a Fresnel lens and a reflector, and the projection lens enlarges and projects the displayed image onto the screen. It has become.

Such an OHP device is configured such that display data is created by a display data creation device provided separately from the OHP device in the fishing boat, and the display data is enlarged and projected by the OHP device.

2. Description of the Related Art Recently, a device has been proposed in which a liquid crystal display (hereinafter referred to as LCD) is directly inserted into a slide projector instead of a slide film, and the display is enlarged using an optical system and projected onto a screen. Additionally, ○HP devices that use an LCD instead of an OHP sheet have been proposed, but such devices have a TN type or STNTN type on a general OHP device.
This is a device that places a shape D and projects it enlarged, and the LCD
is connected to a control device such as a personal computer, and its display data can be changed electronically. However, in such conventional electronic OHP devices, in order to create display data, a dedicated device for creating another data is required, and in order to perform enlarged projection, another enlarged projection device (○I -(P
The display screen is dark and has poor contrast.

When creating data for displaying the problem to be solved by the invention, what is required is that the data manually generated from a keyboard can be viewed directly on a display. On the other hand, what is required when enlarging and projecting data onto a screen is that the display be bright and have good contrast between the background and characters.

However, the conventional electronic ○HP device that enlarges and projects an LCD as described above uses a TN type or STN type liquid crystal that requires a polarizing plate for the LCD. There was a problem in that the transmittance was attenuated and the contrast between the background and the text deteriorated, making it difficult to see.

The present invention has been made in view of these points, and its purpose is to provide an electronic ○HP device that has a built-in data creation device and is capable of obtaining a bright, high-contrast enlarged projected image. be.

A main body is provided on the back side of the first liquid crystal display, and a second liquid crystal display is provided on the back side of the first liquid crystal display. A recording medium is built into this main body, and a keyboard electrically connected to the first and second liquid crystal displays of the main body is detachably attached. Furthermore, a lamp house having a light source lamp, a projection lens, and a projection mirror is rotatably attached to the main body.

Operation Phase change type liquid crystal display is an LCD that utilizes the change from the milky white opaque cholesteric phase to the transparent nematic phase depending on the applied voltage. It has a characteristic that it is not suitable for viewing the screen directly. On the other hand, TN
LCDs using type or STN type liquid crystals do not have sufficient contrast for enlarged projection, but have characteristics that make them suitable for direct viewing of the display screen.

Therefore, the present invention is characterized in that an electronic OHP device is constructed by utilizing the respective advantages of TN type or STN type liquid crystal and phase change type liquid crystal.

That is, when creating display data, the user removes the keyboard from the main unit and inputs the data manually using the keyboard while looking directly at the second liquid crystal display. In order to enlarge and project the data created in this way, the lamp house is rotated and placed on the main body, and the display data displayed on the first liquid crystal display is irradiated with a light source lamp and enlarged and projected onto the screen. I do. Since the first liquid crystal display is a phase change type liquid crystal, it is possible to obtain an enlarged projected image that is bright and has good contrast.

Embodiments The present invention will be explained in detail below based on embodiments shown in the drawings.

1 to 4 show embodiments of the present invention.
The figure is a perspective view during enlarged projection, Fig. 2 is a partially cutaway schematic sectional view during enlarged projection, Fig. 3 is a perspective view when creating a display date, and Fig. 4 is a perspective view when the lamp house and Kini board are stored. It is.

A first liquid crystal display 12 is provided on the front surface of the main body 10, and a second liquid crystal display 14 is provided on the back surface thereof. As shown in FIG. 2, the first liquid crystal display 12 has a reflective film 16 made of aluminum or the like deposited on a printed wiring board 15'', and a phase change liquid crystal 18 made of glass plates 17 and 19 with transparent electrodes formed inside. is enclosed, and a Fresnel lens 20 is laminated on the surface of a glass plate 19. A phase change type liquid crystal display is a liquid crystal display that utilizes a phase change between a cholesteric phase and a nematic phase, and is in a milky white opaque state when no voltage is applied to the transparent electrode. When a voltage is applied to the transparent electrode and approaches a certain threshold voltage, the liquid crystal molecules align along the direction of the electric field,
The pitch of the cholesteric twist begins to increase. When the threshold voltage is exceeded, all liquid crystal molecules except those near the glass surface are oriented in the direction of the electric field and undergo a phase transition to nematic liquid crystal, and at this time the liquid crystal cell becomes transparent. Although this phase change type 81 liquid crystal is not suitable for direct viewing displays, it has good light transmittance, so it has the property of providing a bright and high-contrast image when enlarged and projected onto a screen.

The second liquid crystal display 14 is of TN type or STNTN type.
It is a shaped display and is suitable for direct viewing.

The main body 12 is provided with a power switch 22, and a lamp house 24 is rotatably attached to the main body 12 with pins 23, 23. There is a second lamp in the lamp house 24.
As shown in the figure, a halogen lamp 26 for illumination, a projection mirror 23, a projection lens 30, and a projection mirror 32 are set aside at predetermined positions. It is foldable. A handle 33 is further attached to the lamp house 24.

34 is a keyboard, which is electrically connected to the first liquid crystal display 12 and second liquid crystal display 14 provided on the main body 10 by a cord 36. keyboard 3
4, a large number of keys 35 are arranged as is well known.

The keyboard 34 is detachably attached to the recess 11 of the main body 10. 38 is a floppy disk drive device (FDD), and a floppy disk as a recording medium is attached to these FDDs 38, and display data inputted by the key 35 is recorded.

Reference numeral 40 denotes a remote control device (remote control device) for controlling enlarged projection, and a keyboard 34 when not in use.
It is stored in the storage hole 40 of the holder and can be pulled out and used when in use. 42 is a receiving section of the remote control device 40.

However, when creating display data, the keyboard 34 is removed from the recess 11 of the main body 10, as shown in FIG. 3, and the display data is input using the keyboard 34. Data entered via the keyboard 34 is displayed directly on the screen on a second liquid crystal display 14 consisting of a suitable 1''N type or STN type liquid crystal. Furthermore, the data entered manually can be stored in the F
The data is recorded on a floppy disk, which is a recording medium, via the DD 38.

During enlarged projection, as shown in Figure 1, the lamp house 24
is rotated upward relative to the main body 10 and fixed in the state shown in FIG. 1 by a stopper (not shown). keyboard 34
A floppy disk on which display data is recorded is inserted into the FDD 38 provided on the side of the screen, and the remote controller 40 displays the data on the first liquid crystal display 12, which is suitable for enlarged projection.The screen on the first liquid crystal display is then displayed on the screen. Control the screen while enlarging the projection. When it is necessary to add or modify data, the keyboard 24 is removed and the data is added or modified using the keyboard 24 while being enlarged and projected onto the screen. When not in use, the lamp house 24 and keyboard 34 can be folded and stored compactly as shown in FIG.

Effects of the Invention As described in detail above, the present invention has the following advantages:
This has the effect of being able to provide a bright, high-contrast enlarged projected image without having to separately provide a device for creating display data and a device exclusively for enlarged projection, and without using a conventional expensive large-scale projector device. . Therefore,
It is possible to hold a meeting, etc. using such an enlarged projected image, and data can be easily added or corrected during the meeting.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an embodiment of the present invention during enlarged projection, Fig. 2 is a partially cutaway schematic sectional view during enlarged projection, Fig. 3 is a perspective view of the embodiment when display data is created, and Fig. 4 is a lamp. It is a perspective view of the embodiment when the house and the keyboard are stored. DESCRIPTION OF SYMBOLS 10... Main body, 12... First liquid crystal display, 14... Second liquid crystal display, 20... Fresnel lens, 24... Lamp house, 26... Halogen lamp, 30... Projection Lens, 32...Projection mirror, 34...Keyboard, 38...FDDo 8shi''1 operation. , size vco guest--to nn < ・ng kidney k V

Claims (1)

[Scope of Claims] A first liquid crystal display (12) comprising a reflector (16), a phase change liquid crystal (18) and a Fresnel lens (20) on its surface, the first liquid crystal display (12) The main body (10) has a second liquid crystal display (14) made of a TN type or STN type liquid crystal on the back side, and a recording medium is built in, and the first (12) and second
A keyboard (34) electrically connected to the liquid crystal display (14) and detachably attached to the main body (10).
); and a lamp house (24) that has a light source lamp (26), a projection lens (30), and a projection mirror (32) and is rotatably attached to the main body (10). Electronic overhead projector equipment.