JP2000010188A - Liquid crystal projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal projection type display device capable of easily and rapidly performing picture adjustment on a display screen. SOLUTION: This device is provided with a projection unit 1 incorporating a liquid crystal panel for displaying a picture and projecting light transmitted through the liquid crystal panel to the outside through a projection lens 1c, and a unit supporting base 2 supporting the unit 1 so that it can rotate around the optical axis C of the lens 1c and can be tilted on a plane including the optical axis C. The rotating position of a rotary table 22 on the base 2 and the tilt angle and the height of the table 23 are adjusted so as to perform the picture adjustment on the display screen where the display picture on the liquid crystal panel is enlarged and displayed by radiating projected light from the unit 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal projection display device for enlarging and displaying a display image on a liquid crystal panel.

[0002]

2. Description of the Related Art A liquid crystal panel for image display is irradiated with light,
A liquid crystal projection display device that guides the transmitted light of the liquid crystal panel to a display screen via an enlargement optical system and enlarges and displays a display image of the liquid crystal panel on the display screen,
It is widely used as a display device capable of displaying an image on a large screen with a small occupation area as compared with a generally used CRT (Cathode Ray Tube) display device.

FIGS. 6A and 6B are JP-A-8-114859 and JP-A-5-14859.
FIG. 1 is a cross-sectional view schematically illustrating a configuration of a conventional liquid crystal (rear) projection display device disclosed in Japanese Patent No. 157988. This display device has one side (front) as shown in the figure.
A folding mirror 5 is arranged on the inner rear part of the outer casing 4 provided with the transmissive display screen 3 on the upper part of the outer casing 4 so as to face the display screen 3, and the projection unit 1 is arranged on the inner lower part of the outer casing 4. It is configured.

The projection unit 1 has a built-in liquid crystal panel 1a for displaying an image, a light source 1b arranged on one side of the liquid crystal panel 1a via an optical element, and a projection lens 1c on the other side. An enlargement optical system is provided, and the light emitted from the light source 1b and converted into parallel light by the optical element is applied to the liquid crystal panel 1a during image display, and the transmitted light of the liquid crystal panel 1a is transmitted to the enlargement optical system. To project outside through the projection lens 1c located at the end of the magnifying optical system.

[0005] The projection unit 1 configured as above is
The optical axis C of the projection lens 1c is fixed and supported on the unit support base 2 at the lower part inside the outer casing 4 with the optical axis C of the projection lens 1c obliquely rearward and upward. The center is substantially coincident with the extension of the axis C, and the optical axis C,
The display screen 3 is attached to the display screen 3 facing the front with a predetermined inclination.

Accordingly, the projection light from the projection unit 1 reaches the folding mirror 5 while expanding its optical path width, as shown by the broken line in the figure, and is reflected forward by the folding mirror 5 to display the display screen. 3 is illuminated. As a result, the display image of the liquid crystal panel 1a inside the projection unit 1 is enlarged and displayed on the display screen 3 configured as a transmissive screen so as to be visible from the outside of the outer casing 4.

[0007]

In the liquid crystal projection type display device configured as described above, the small area image displayed on the liquid crystal panel 1a inside the projection unit 1 is enlarged and displayed on the display screen 3. Therefore, in order to perform an accurate image display, it is necessary to align the mounting positions of the projection unit 1, the bending mirror 5, and the display screen 3 with high accuracy in the assembling stage.

However, the projection unit 1, the bending mirror 5, and the display screen 3 are, as shown in FIG.
Since they are mounted at different positions inside, there is a problem that a large number of assembling steps are required to align them with desired accuracy. Therefore, conventionally, the projection unit 1, the folding mirror 5, and the display screen 3
After fixing the display screen in a predetermined mounting position, the display screen 3
Above, a screen adjustment operation for adjusting the position and the inclination of the liquid crystal panel 1a is performed so that an accurate image display including the size, the inclination, the tilt and the rotation is performed.

However, in the conventional screen adjustment operation performed as described above, the liquid crystal panel 1a to be adjusted is
Is built in the projection unit 1, a special jig is required for adjusting the position and tilt, workability is poor, and enlargement on the display screen 3 by slight adjustment of the liquid crystal panel 1 a. Since the image greatly changes, there has been a problem that a high level of skill and a large number of man-hours are required.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a liquid crystal projection display device which can easily and promptly adjust a screen on a display screen.

[0011]

According to a first aspect of the present invention, there is provided a liquid crystal projection type display device comprising: a projection unit having a liquid crystal panel and a projection lens; and a rotation unit around the optical axis of the projection lens and a plane including the optical axis. And supported by a unit support table.

In the present invention, the projection unit is rotated and tilted on a unit support that supports the projection unit, and the display image on the display screen is adjusted, including the size, position, tilt and rotation.

According to a second aspect of the present invention, there is provided a liquid crystal projection type display apparatus, wherein: a fixed base; a rotary table rotating within an upper surface of the fixed base; and a support table supported on the rotary table by a plurality of support rods. And a unit support base, and the projection unit is supported on the support table with the optical axis of the projection lens coincident with the rotation axis of the rotary table.

In the present invention, by rotating the rotary table on the fixed base, the projection unit is rotated around the optical axis of the projection lens to adjust the rotational position of the image on the display screen, and to control a plurality of supports. The support position of the support table by the rod is individually changed in each axial direction, and the projection unit is tilted together with the support table to adjust the size, position, and tilt of the image on the display screen.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing the embodiments. FIG. 1 is a perspective view showing a mounting state of a projection unit to a unit support, which is a characteristic part of the liquid crystal projection display device according to the present invention.

In FIG. 1, reference numeral 1 denotes a projection unit. This projection unit 1 has a built-in liquid crystal panel for image display and a magnifying optical system composed of optical components such as lenses and mirrors, and a light source having a built-in light source on one side outside, similarly to that shown in FIG. A projection lens 1c, which forms a part of the magnifying optical system, is attached to the unit 10 and to the outside of the other side, respectively, and emits light from a light source to a liquid crystal panel during image display, similarly to the conventional projection unit 1. The light transmitted through the liquid crystal panel is magnified by the magnifying optical system and projected outside on the optical axis C of the projection lens 1c.

In the figure, reference numeral 2 denotes a unit support for supporting the projection unit 1. As shown in FIG. 6, the unit support base 2 includes a rotary table 22 and a support table 23 above a fixed base 21 fixed to the lower inner surface of the outer casing of the liquid crystal projection display device. .

As shown in the figure, the fixed base 21 is a rectangular box-shaped member having an upper surface inclined toward one side. In the following description, the inclination direction of the upper surface will be referred to as a depth direction, and a direction perpendicular to the depth direction. In the width direction. The turntable 22 is a rectangular flat plate having a size slightly smaller than the upper surface of the fixed base 21, and one side in the width direction is erected vertically at a corresponding position on the upper surface of the fixed base 21. The support shaft 24 is supported by the support shaft 24 and is rotatably mounted on the upper surface with the support shaft 24 as a pivot.

At four corners of the turntable 22, four support rods 25, 25,...
The support table 23 is a rectangular flat plate having substantially the same size as the rotary table 22, and its four corners are
The projection unit 1 is inserted through 5, 25... And is supported at an appropriate distance from the upper surface of the rotary table 22. The projection unit 1 configured as described above is a projection lens indicated by a chain line in FIG.
The above-mentioned support shaft in which the optical axis C of 1c is the center of rotation of the rotary table 22
24 is positioned so as to substantially coincide with the support table 23.
The upper part is screwed and fixed by a plurality of fixing screws.

FIG. 2 shows a rotary table 22 on a fixed base 21.
FIG. 3 is an explanatory view of a mounting mode of the support table 23 and FIG.
FIG. 4 is a side sectional view showing a configuration of a position adjusting mechanism of a rotary table 22 and a support table 23.

As shown in FIG. 2, the rotary table 22 has a rectangular opening 26 penetrating the rotary table 22 from the position supported by the support shaft 24 in the width direction at an appropriate length in the front and back. On the upper surface of the turntable 22, a support bracket 27 is fixed facing one edge in the width direction of the opening 26,
The support bracket 27 has an adjustment screw shaft 28 which is parallel to the upper surface of the turntable 22 and whose longitudinal direction is the depth direction.
Are rotatably supported around an axis.

On the other hand, on the upper surface of the fixed base 21, a rotary table is provided.
A screw bracket 29 is fixed at a position corresponding to the opening 26 of the 22. One end of the adjusting screw shaft 28 is screwed to the screw bracket 29. As shown in FIGS. 3 and 1, the other end of the adjusting screw shaft 28 protrudes from the same side edge of the turntable 22 by an appropriate length. The adjusting screw shaft 28 is attached to the projecting end. By rotating the knob 30, it can be rotated around the axis.

When the adjustment knob 30 is rotated to rotate the adjustment screw shaft 28, the adjustment screw shaft 28 is screwed into the screw bracket 29, and the screw bracket 29 is fixed. With respect to the base 21, the rotary table 22 supporting the adjusting screw shaft 28 via the support bracket 27 is pushed and pulled,
The rotary table 22 rotates about the support shaft 24, and the support table 23 rotates with the rotation of the support table 24.
The projection unit 1 fixed as described above includes the support shaft
Thus, the projection lens 1c is rotated about the optical axis C of the projection lens 1c, which coincides with 24.

The rotary table 22 has fixing flanges 31 extending along both side edges in the width direction.
After being adjusted to a desired rotational position by the operation of the adjustment knob 30, a fixing screw is inserted into a plurality of elongated holes formed as shown in each of the flanges 31, 31. By tightening the rotary table 21, the rotary positions of the rotary table 22 and the projection unit 1 can be restricted.

The adjustment of the rotational positions of the rotary table 22 and the projection unit 1 performed in this manner is performed by adjusting the adjustment screw shaft.
Since the screwing of 28 is used, adjustment at a fine angle can be easily performed without skill.

Next, the mechanism for adjusting the position of the support table 23 will be described. The four support rods 25, 25,... Erected at the four corners of the turntable 22 are screw shafts having a thread formed on the outer periphery thereof, as shown in the figure. The positioning nuts 32 are screwed together. On the other hand, the support table 23 has four support rods 25, 25 at its four corners.
(See FIG. 2) having through holes for the support brackets 33, 33... Inserted into the corresponding support rods 25, 25. The support rods 25 are sandwiched from both upper and lower sides by the support rods 25, and are erected in the middle of the support rods 25.

With the above configuration, the support table 23 individually changes the support position in the axial direction of the support rods 25 supporting the four corners by adjusting the screwing positions of the respective positioning nuts 32. With this change, the tilt angle of the support table 23 with respect to the upper surfaces of the rotary table 22 and the fixed base 21 can be freely changed.

For example, when the same amount of support position is changed in the same direction for each of the two support rods 25 arranged on one side in the width direction or the depth direction, the support table 23 The projection unit 1 tilted in the width direction or the depth direction with the side up or down, and supported on the support table 23
Is inclined in the width direction or the depth direction in the plane including the optical axis C of the projection lens 1c.

Further, two support rods 25, which are arranged diagonally,
For each of the 25, when the same amount of change of the support position is performed in the opposite direction, the support table 23 tilts in the corresponding diagonal direction, and the projection unit 1 supported on the support table 23 In the plane including the diagonal, that is, the projection lens 1c
In the plane including the optical axis C.

Further, support rods 25 supporting four corners are provided.
When the same amount of support position is changed in the same direction, the support table 23 moves up and down, and the support height of the projection unit 1 supported on the support table 23 can be changed. .

The tilt adjustment of the support table 23 and the projection unit 1 performed in this manner is performed by adjusting the screwing of the positioning nuts 32 with respect to the support rods 25 configured as a screw shaft. Fine adjustment in the direction can be easily performed without skill. As shown in FIG. 3, the positioning nuts 32, 32 and the support bracket 33 have their contact portions formed into spherical surfaces, so that even when the support table 23 is tilted in an appropriate direction, the positioning nuts 32, 32 and the support bracket 33 are tilted. The support bracket 33 is firmly clamped by the support table 23 and the projection unit 1.
It is made to be able to support reliably.

As described above, in the liquid crystal projection type display device according to the present invention, the operation of the rotary table 22 and the support table 23 of the unit support 2 allows the support table 23 to be operated.
The projection unit 1 fixed above can be rotated around the optical axis C of the projection lens 1c, and can be tilted in a plane including the optical axis C, and further, the supporting height of the projection unit 1 is adjusted. With these adjustments, it is possible to easily adjust the screen of the image enlarged and displayed on the display screen 3 by the irradiation of the projection light from the projection unit 1.

FIG. 4 and FIG. 5 are explanatory diagrams of the procedure for performing the screen adjustment. As shown in the figure, the projection light from the projection unit 1 is reflected by the folding mirror 5 while expanding its optical path width, and is irradiated on the back surface of the display screen 3 facing the front of the folding mirror 5, and is projected on the display screen 3. The display image of the liquid crystal panel inside the projection unit 1 is enlarged and displayed.

First, when the height position of the projection unit 1 is changed by moving the support table 23 up and down, the distance between the projection unit 1 and the bending mirror 5 increases or decreases, and as a result, the image displayed on the display screen 3 becomes As shown in FIG. 4A, the image is enlarged or reduced without changing its shape. Therefore, by moving the support table 23 up and down while viewing the display on the display screen 3, the size of the display image on the display screen 3 can be adjusted to obtain an image of an appropriate size indicated by a solid line in the figure. it can.

When the rotary table 22 is rotated to rotate the projection unit 1 around the optical axis C, the display image on the display screen 3 rotates around its center point as shown in FIG. I do. Therefore, by rotating the rotary table 22 while visually recognizing the display on the display screen 3, the display image on the display screen 3 is rotated and parallel to each side of the display screen 3 as shown by the solid line in the figure. And an appropriate image can be obtained.

FIG. 5A shows the case where the projection unit 1 is tilted in the depth direction of the support table 23, and FIG.
FIGS. 5C and 5D show the case where the projection unit 1 is tilted in the width direction.
The change of the display image on the display screen 3 when the projection unit 1 is tilted in the diagonal direction of FIG. As shown in these figures, the display image on the display screen 3 becomes an image in which one side is wider than the other side, that is, an image in which tilt occurs, in accordance with the tilt of the projection unit 1, and furthermore, in addition to the tilt, the position changes. Is generated.

Therefore, by visually recognizing the form of the image displayed on the display screen 3 in the initial assembly state, the tilt angle of the support table 23 is adjusted in an appropriate direction in accordance with the visual form, so that the display screen can be tilted and tilted. Position adjustment can be easily performed, and as shown by a solid line in each figure,
An appropriate image in which the tilt and the position are corrected can be obtained.

[0038]

As described above in detail, in the liquid crystal projection type display device according to the first aspect of the present invention, the projection unit including the liquid crystal panel and the projection lens can be rotated around the optical axis of the projection lens and the plane including the optical axis. Since the unit is supported by the unit support so that it can be tilted inside, by rotating and tilting the projection unit on the unit support, the size, position, tilt and rotation of the display image on the display screen can be adjusted. And can be adjusted easily and quickly.

Further, in the liquid crystal projection type display device according to the second aspect, the fixed base, the rotary table rotating in the upper surface of the fixed base, and the plurality of support rods are supported on the rotary table. The support table is used to form a unit support base, and the projection unit is supported on the support table with the optical axis of the projection lens coincident with the rotation axis of the rotary table, so that the projection is performed by rotating the rotary table on the fixed base. By rotating the unit around the optical axis of the projection lens, the rotation position of the image on the display screen can be easily adjusted, and the support position of the support table by the plurality of support rods can be individually set in each axial direction. Change and tilt the projection unit with this support table to make it easy to adjust the size, position and tilt of the image on the display screen. Like kill, the present invention exhibits the excellent effect.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state where a projection unit is attached to a unit support base.

FIG. 2 is an explanatory diagram of a mode of mounting a rotary table and a support table on a fixed base.

FIG. 3 is a side sectional view showing a configuration of a position adjusting mechanism of a rotary table and a support table.

FIG. 4 is an explanatory diagram of an execution procedure of screen adjustment.

FIG. 5 is an explanatory diagram of an execution procedure of screen adjustment.

FIG. 6 is a cross-sectional view schematically showing a configuration of a conventional liquid crystal projection display device.

[Explanation of symbols]

1. Projection unit, 1c projection lens, 2 unit support base, 21 fixed base, 22 rotary table, 23 support table, 24 support shaft, 25 support rod, 28 adjustment screw shaft, 32
Positioning nut.

Claims (2)

[Claims] 1. A projection unit for irradiating a liquid crystal panel displaying an image with light and projecting the transmitted light of the liquid crystal panel to the outside through a projection lens, and rotating the projection unit around the optical axis of the projection lens. And a unit support base that tiltably supports a plane including the optical axis, and a display screen that is irradiated with projection light from the projection unit to enlarge and display a display image of the liquid crystal panel. A liquid crystal projection display device characterized by the following. 2. A unit support base comprising: a fixed base; a rotary table rotatably mounted on an upper surface of the fixed base; a means for adjusting a rotational position of the rotary table; A support table that is supported by a plurality of support rods that stand substantially vertically on the upper surface of the rotary table, and that supports a projection unit above the optical axis of the projection lens so as to substantially coincide with the rotation axis of the rotary table. 2. The liquid crystal projection display device according to claim 1, further comprising: means for changing the position of the support table supported by each support rod in the direction of the respective axial lengths and adjusting the inclination of the support table.