JPH0649021Y2 - LCD projector - Google Patents

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a liquid crystal projector.

[Technical background of the device and its problems]

A liquid crystal projector displays an image using a transmissive liquid crystal display panel and projects a display image of the liquid crystal display panel on a screen surface in an enlarged manner.
Generally, a light source is provided on the back side of the transmissive liquid crystal display panel,
A projection lens for enlarging a display image of the liquid crystal display panel and projecting it on the screen surface is provided in front of the liquid crystal display panel. That is, this liquid crystal projector
The display image of a liquid crystal display panel (for example, a television image) is enlarged so that it can be viewed. According to this liquid crystal projector, the display image of a liquid crystal display panel having a small screen can be viewed as a large screen image. .

However, since the conventional liquid crystal projector has all the components such as the light source, the projection lens, and the liquid crystal display panel fixed in the projector case, it can be used only as a projector, and therefore it is not versatile. I had the problem of not having it.

[Purpose of device]

The present invention has been made in view of the above situation, and its purpose is not only for a projector but also for a display of a liquid crystal display panel such as a portable small liquid crystal television receiver. An object of the present invention is to provide a liquid crystal projector that can be used as a small liquid crystal display device for directly observing an image.

[Outline of device]

That is, according to the invention, a projector main body provided with a light source and the projection means, a device main body containing a main circuit including a display signal source, a liquid crystal display panel, and the liquid crystal display panel based on the signal of the display signal source. An apparatus separate from the projector body, comprising a display drive circuit for driving and electrically connected to the equipment body and rotatably connected to the equipment body. A portable small liquid crystal display device that can be used alone, and a display unit of the small liquid crystal display device is detachably arranged between the light source of the projector body and the projection means, and the liquid crystal of the display unit is provided. The display image on the display panel is enlarged and projected by the projection means.

Therefore, the projector of the present invention does not incorporate a liquid crystal display panel for displaying a projected image in the projector body, and uses a liquid crystal display panel of a small liquid crystal display device separate from the projector body to display the display image. When the display unit of the small liquid crystal display device is arranged between the light source of the projector body and the projection means, the display image of the liquid crystal display panel of the display unit is projected by the projection means of the projector body. You can enlarge and project with. The small liquid crystal display device is separate from the projector main body, and the liquid crystal display device is composed of the device main body having the main circuit including the display signal source built therein and the unit. This small liquid crystal display device can be used alone by taking it out of the projector body.

[Example of device]

An embodiment of the present invention will be described below with reference to the drawings by taking a liquid crystal projector that projects a television image on a screen surface as an example.

In FIGS. 1 to 3, 10 is a projector main body,
11 is the case, and the projection window is on the front of this case 11.
12 is opened, and a television receiver insertion opening 13 for inserting a display unit 32 of a portable small liquid crystal television receiver 30 described later is provided at the center of the upper surface of the case 11. .

Further, 14 is a light source lamp provided in the rear portion of the case 11, 15 is a reflector having a cold mirror formed on the inner surface, and the light source lamp 14 and the reflector 15 are mounted on a lamp mount 16 having a lamp cooling fan built therein. Installed. The light source lamp 14 is a halogen lamp or a xenon lamp in order to make the light source as bright as possible. Reference numeral 17 is a lamp power supply unit.

18 is a condenser lens provided between the light source lamp 14 and the television receiver insertion portion, and 19 is a relay lens (aspherical lens) provided between the condenser lens 18 and the television receiver insertion portion. The condenser lens 18 and the relay lens 19 are attached to a lens support 20 fixed to the bottom surface of the case. Further, 21 is a condenser lens provided in front of the television receiver insertion portion, 22
Is a projection lens provided in front of the condenser lens 21, the condenser lens 21 is mounted on a lens support 23 fixed to the bottom surface of the case, and the projection lens 22 is a lens mounting plate erected on the bottom surface of the case. It is fitted with 24.

Reference numeral 25 denotes an infrared absorption filter provided between the light source lamp 14 and the television receiver insertion portion, for example, between the light source lamp 14 and the condenser lens 18, and the infrared absorption filter 25 is a filter erected on the bottom surface of the case. It is attached to the mounting plate 26.

Further, 27 is a display unit cooler for air-cooling the display unit 32 of the small portable liquid crystal television receiver 30 inserted into the television receiver insertion portion from the television receiver insertion opening 13, and this display unit cooling The device 27 is provided inside the case 11 so as to be located on the side of the television receiver insertion portion. This display unit cooler 27 is one in which a blower fan is provided inside the body having an intake opening that opens to the outside of the case 11, and the front surface of the display unit cooler 27 facing the television receiver insertion portion is A flat cooling air outlet (28) for blowing cooling air toward a display unit (32) of a small portable liquid crystal television receiver (30) is provided.

4 and 5 show the portable small-sized liquid crystal television receiver 30. The portable small-sized liquid crystal television receiver 30 comprises a receiver main body 31 and a display unit 32. .

The receiver main body 31 is a thin box-shaped case provided with main circuits such as a tuning circuit, a linear circuit, and an audio amplifier circuit (not shown). At the front end of the receiver main body 31, A power switch 33, a VHF-UHF selector switch 34, a channel selection display section 35, a tuning knob 36, an audio volume adjusting knob 37, etc. are provided, and the receiver main body is further provided.
A reflection plate 38 is provided on the upper surface of 31.

Further, the display unit 32 has a base end portion which is the main body of the receiver.
It is pivotally mounted on the rear end portion of 31 so as to be able to rise and fall.
This display unit 32 is located between the daylighting window 39 and the display window 40 in a flat case in which a daylighting window 39 is provided on the back surface facing the upper surface of the receiver body 31 and a display window 40 is provided on the surface. hand
A transmissive dot matrix liquid crystal display panel 41 of TN type (twisted nematic type) is provided, and a display drive circuit (not shown) for driving the liquid crystal display panel 41 is provided in the display unit 32. There is. The display drive circuit is connected to the liquid crystal display panel 41 and is also connected to the linear circuit of the main circuit built in the receiver body 31 by a flexible cable.

In this portable small-sized liquid crystal television receiver 30, the display unit 32 is stored on the upper surface of the receiver main body 31 when not in use, and the display unit 32 is used by tilting the display unit 32 diagonally as shown in the drawing when in use. In the liquid crystal display panel 41,
As shown by the arrow in FIG. 5, the rear surface is illuminated by the external light reflected by the reflection plate 38 on the upper surface of the receiver main body and taken in through the lighting window 39 of the display unit 32. The liquid crystal television receiver 30 includes a monochrome television receiver using a monochrome display type liquid crystal display panel and a color television receiver using a color liquid crystal display panel.

Further, this portable small-sized liquid crystal television receiver 30 is also used as a display body of a liquid crystal projector, and this liquid crystal television receiver 30 has a display unit 32 that is more than that when it is used as a television receiver. The display unit 32 to the TV receiver insertion opening
As shown in FIG. 3, the front surface side of the display unit 32 (the display surface side of the liquid crystal display panel 41) was directed toward the projection lens 22 side by inserting the display unit 32 into the television receiver insertion portion in the projector body 10. The projector body 10 is mounted in this state.

This liquid crystal projector is the liquid crystal television receiver.
30 display unit 32 is the light source lamp of the projector body 10
14 and the projection lens 22 (a relay lens in this embodiment)
(Between 19 and the condenser lens 21), and in this state, the liquid crystal television receiver 30 performs a receiving operation to display a television image on the liquid crystal display panel 41 of the display unit 32. 41 Display image a
The illumination light from the light source lamp 14 reflected by the reflector 15 is enlarged by 22 and is projected on the screen S surface. First, the infrared light is absorbed by the infrared absorption filter 25, and then the condenser lens 18 and the relay. lens
The display unit 32 is passed through 19 and further through a daylighting window 39 provided on the rear surface of the display unit of the liquid crystal television receiver 30.
Entering inside, the transmissive liquid crystal display panel 41 is illuminated from the back side. The light that has passed through the liquid crystal display panel 41, that is, the light image corresponding to the display image a of the liquid crystal display panel 41, passes through the display window 40 provided on the surface of the display unit 32 and is projected by the condensing lens 21 to the projection lens 22. Is condensed by the projection lens 22 to be enlarged and projected on the screen S surface.

That is, this liquid crystal projector uses the liquid crystal display panel 41 of the portable small liquid crystal television receiver 30 as a liquid crystal display panel for displaying a screen projection image, and the liquid crystal television receiver 30 displays the liquid crystal display panel 41. A lighting window 39 and a display window 40 are provided on the front and back of the unit 32.
Since the transmissive liquid crystal display panel 41 is arranged between the display window 39 and the display window 40, the display unit 32 of the liquid crystal television receiver 30 is inserted into the projector body 10 and the liquid crystal display of the display unit 32 is displayed. Panel 41 to projector body 10
If it is positioned between the light source lamp 14 and the projection lens 22, the liquid crystal display panel 41 of the liquid crystal television receiver 30 will be described.
The display image a of can be enlarged and projected on the surface of the screen S. Further, the liquid crystal television receiver 30 is separate from the projector body 10, and the liquid crystal television receiver 30 includes a receiver body 31 having a built-in main circuit and the display unit 32. From its display unit 32
When the liquid crystal television receiver 30 is taken out of the projector body 10 and the liquid crystal television receiver 30 is detached from the projector body 10, the liquid crystal television receiver 30 can be used alone.

In this embodiment, as described above, the display unit 32 of the liquid crystal television receiver 30 has the projection lens 22 on the surface side.
Since the image is projected into the projector main body 10 in a state of being directed to the side, the image appears to be turned upside down when viewed from the projector side, so in this embodiment, the screen S is a semitransparent screen. The image projected on the screen S is viewed from the side opposite to the projector.

Further, in this embodiment, the display unit 32 of the liquid crystal television receiver 30 is set at a predetermined angle with respect to the optical axis O of the projector (a line connecting the center of the liquid crystal display panel 41 and the center of the screen) as shown in FIG. The condenser lens 21 and the projection lens 22 in the projector main body 10 are inclined and inserted so as to be parallel to the display unit 32. In this way, the display unit 32 is set to the optical axis O of the projector.
The TN type LCD panel is tilted with respect to the direction in which the display is best viewed, that is, the proper viewing angle is not perpendicular to the display surface of the LCD panel, but rather to some extent (normal TN type LCD panel). This is because the panel is tilted in the direction of 10 ° to 20 °), and the liquid crystal display panel 41 is tilted by a predetermined angle as described above so that the liquid crystal display panel 41 is positioned at an appropriate viewing angle of the liquid crystal display panel 41 with respect to the optical axis O of the projector. If it is tilted only, an image with the highest brightness and good contrast can be projected on the screen S surface as in the case where the display of the liquid crystal display panel 41 is viewed from the proper viewing angle direction.

Further, in this embodiment, as described above, the light source lamp 14
And an infrared absorption filter 25 is provided between the television receiver insertion portion and the television receiver insertion portion so that the infrared absorption filter 25 absorbs the infrared component contained in the illumination light traveling from the light source lamp 14 toward the liquid crystal display panel 41. Therefore, the liquid crystal display panel 41 is not heated by the infrared ray component in the illumination light, and since the display unit 32 is air-cooled by the display unit cooler 27 provided on the side thereof, Projector body 10 due to heat dissipation from light source lamp 14
Since it is also possible to prevent the display unit 32 from being heated by the temperature rise inside the liquid crystal display panel 41, it is possible to prevent the infrared component contained in the illumination light from the light source lamp 14 and the temperature inside the projector body 10. There is no possibility that the liquid crystal display panel 41 is heated by the rise and the liquid crystal display panel 41 does not operate normally.

In the above embodiment, the display unit 32 of the liquid crystal television receiver 30 is inserted into the projector main body 10 with its surface side facing the projection lens 22 side, but this liquid crystal television receiver 30 is Display unit as shown in Figure 6
Projection lens on the back side of 32 (the back side of the liquid crystal display panel 41)
It may be inserted into the projector main body 10 in a state of facing the 22 side, and in that case, the image projected on the screen S surface may be viewed from the projector side.

Further, in the above-described embodiment, the portable small liquid crystal television receiver 30 is used as a small liquid crystal display device separate from the projector body 10, and the television displayed on the liquid crystal display panel 41 of the liquid crystal television receiver 30. Although the John image is projected on the screen S surface, the small liquid crystal display device described above is electrically connected to a device body having a main circuit built therein, a liquid crystal display panel, and a main circuit of the device body. As long as it comprises a display unit having a display drive circuit for driving a display panel, it may be, for example, a VTR (video tape recorder) liquid crystal monitor, a liquid crystal display type game machine, or the like. By disposing the display unit of the small liquid crystal display device between the light source of the projector body and the projection means, the display image of the liquid crystal display panel of this display unit can be displayed on the projector unit. It can be enlarged and projected by the projection means, also be taken out to the display unit to the outside of the projector main body, it is possible to use this small liquid crystal display device alone.

[Effect of device]

According to this invention, a liquid crystal display panel for displaying an image to be projected is not incorporated in the projector main body, and a liquid crystal display panel of a small liquid crystal display device separate from the projector main body is used to display the display image by the projector main body. Since the image is enlarged and projected, if the display unit of the small liquid crystal display device is arranged between the light source of the projector body and the projection means, the display image of the liquid crystal display panel of this display unit is enlarged by the projection means of the projector body. Can be projected. The small liquid crystal display device is separate from the projector main body, and the liquid crystal display device includes the device main body containing the main circuit including the display signal source and the unit. This small liquid crystal display device can be used alone by taking it out of the projector body.

[Brief description of drawings]

1 to 5 show an embodiment of the present invention,
FIG. 1 is a principle configuration diagram of a liquid crystal projector, FIG. 2 is a perspective view of a projector main body, FIG. FIG. 1 is a perspective view and a partially cutaway side view of a small portable liquid crystal television receiver. FIG. 6 is a principle block diagram of a liquid crystal projector showing another embodiment of the present invention. 10 …… Projector body, 11 …… Case, 13 …… TV receiver insertion slot, 14 …… Light source lamp, 18 …… Condenser lens, 19 …… Relay lens, 21 …… Condenser lens,
22 …… Projection lens, 25 …… Infrared absorption filter, 27 ……
Display unit cooler, 28 ... Cooling air outlet, 30 ... Portable small liquid crystal television receiver, 31 ... Receiver body,
32 …… Display unit, 39 …… Daylighting window, 40 …… Display window, 41
...... Liquid crystal display panel, S …… Screen.

Claims (1)

[Scope of utility model registration request] 1. A liquid crystal projector for enlarging and projecting a display image of a liquid crystal display panel by a projecting means, a light source and a projector body having the projecting means, a device body having a main circuit including a display signal source, and a liquid crystal display. A panel and a display drive circuit that drives the liquid crystal display panel based on a signal from the display signal source, are electrically connected to the device body, and are rotatably connected to the device body. A portable small liquid crystal display device, which is composed of a display unit and is separate from the projector main body, and which can be used by the device alone; and between the light source and the projection means of the projector main body, the small liquid crystal display device A liquid crystal projector characterized in that a display unit is detachably arranged and a display image of the liquid crystal display panel of the display unit is enlarged and projected by the projection means.