JPH0916102A - Image display device - Google Patents

Abstract

PURPOSE: To provide the display device which has small vibration. CONSTITUTION: A device main body 21 is provided rotatably around a fixed shaft 24 in a case 25 by inserting the fixed shaft 24 into the insertion hole 22 of the device main body 21 and fixing both the ends of the fixed shaft 24 to support members 26 in the case 25, and a motor 35 which rotates the device main body 21 is provided on the right-end surface of the device main body 21 and at the outer peripheral part of the fixed shaft 24 integrally with the device main body 21. Plural light emission bodies 28 which are arranged on a straight line crossing the direction of rotation at right angles are provided at a specific place on the outer peripheral surface of the device main body 21. In this case, a two-dimensional image signal for every scanning line corresponding to the angle of rotation is applied while the device main body 21 is rotated to make the light emission bodies 28 corresponding to the two-dimensional image signal for every scanning line, so that a two-dimensional image can be projected on a screen. Thus, a scan can be made continuously only by rotating the device main body 21 and vibration can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device,
In particular, the present invention relates to a bar array type image display device for displaying a two-dimensional image by moving light emitters arranged on a straight line.

[0002]

2. Description of the Related Art A conventional bar array type image display device is shown in FIG. In this image display device, a magnifying lens 3 which magnifies the light emitted by the light emitting means 2 is arranged in front of the light emitting means 2 in the case 1, and the light from the magnifying lens 3 is reflected in front of the magnifying lens 3 to form a case. 1
A scanning mirror 5 for projecting on the outer screen 4 is arranged. In the light emitting means 2, a plurality of light emitting bodies 7 including LEDs (light emitting diodes) or the like are provided on a substrate 6 in a straight line in a vertical direction, and drive elements 8 for driving the light emitting bodies 7 are provided on both sides of these light emitting bodies 7. It has a special structure. The scanning mirror 5 is provided with a counterweight 10 on the back surface of the mirror plate 9, and a rotating shaft 11 is provided vertically at the center of the counterweight 10. The mirror plate 9 and the counterweight 10 are rotating shafts. 11 has a structure capable of swinging in the range of the swing angle θ in the directions (arrow A direction and arrow B direction) orthogonal to the arrangement direction of the light emitters 7.

Next, a case where a two-dimensional image is displayed on the screen 4 using such an image display device will be described. First, while rotating the scanning mirror 5 in the direction of arrow A at a predetermined speed, a two-dimensional image signal for each scanning line corresponding to the rotation angle of the scanning mirror 5 is applied to each light emitting body 7, and each light emitting body 7 is driven. When light is emitted according to a two-dimensional image signal for each scanning line and light from each light emitting body 7 is scanned from one end to the other end on the screen 4 through the opening 1a of the case 1, the light is emitted on the screen 4. A two-dimensional image corresponding to the two-dimensional image signal is projected. Then, the scanning mirror 5 is rotated in the direction of the arrow B to return it to the original position, and then the scanning mirror 5 is rotated in the direction of the arrow A at a predetermined speed, and in the same manner, the respective light emitting members 7 are formed.
When the light from is scanned from one end to the other end on the screen 4, a two-dimensional image corresponding to the two-dimensional image signal is continuously projected on the screen 4.

[0004]

However, in such a conventional image display device, since it is necessary to return the scanning mirror 5 to the original position when the scanning for one frame is completed, the scanning is performed when the scanning is continuously performed. The mirror 5 oscillates, and the reaction at this time may oscillate the scanning mirror 5 and the light emitting means 2. In particular, the mass and the oscillating angle θ of the scanning mirror 5 are large, or the case 1 in which the scanning mirror 5 is attached. There is a problem that the vibration becomes larger when the mass of is small. In this case, not only the operation of the light emitting means 2 and the scanning mirror 5 is affected, but also the mechanical strength of the case 1 is gradually deteriorated, the mounting accuracy of the parts is deteriorated, the image quality is deteriorated, and the device eventually fails. Sometimes. An object of the present invention is to provide an image display device capable of reducing vibration.

[0005]

According to the present invention, there is provided a device body rotatably provided, a rotating means for rotating the device body, and a rotation direction of the device body provided by the device body. And a light emitting means having a plurality of light emitting portions for displaying a plurality of pixels in a direction orthogonal to the direction.

[0006]

According to the present invention, since the light emitting means having a plurality of light emitting portions for continuously displaying a plurality of pixels in a direction orthogonal to the rotation direction by rotation is provided, an image can be displayed only by rotating the main body of the device. It is possible to return the light emitting means to the original position while displaying, and it is not necessary to swing the scanning mirror to return to the original position as in the conventional case, and it is possible to prevent the vibration due to the reaction at the time of swinging from occurring. And vibration can be reduced. Further, when the light emitting means is arranged at a plurality of predetermined positions of the apparatus main body as in the second aspect of the invention, if the light emitting bodies of the respective light emitting means are made to emit light of different colors, the intermediate tone is obtained by rotation. It is possible to display, on the other hand, if each illuminant emits a single color, it is possible to multiply the scanning speed to further reduce the flicker,
Alternatively, the rotation speed of the device main body can be reduced to a plurality of times to allow a margin for the operation speed of the light emitting means.

[0007]

1 to 3 show an image display device according to an embodiment of the present invention. In this image display device, the fixed shaft 24 is inserted into the insertion hole 22 of the cylindrical device body 21 with the bearings 23 interposed at both ends, and both ends of the fixed shaft 24 are fixed to the support member 26 in the case 25. As a result, the device body 21 is rotatably provided around the fixed shaft 24 in the case 25. A light emitting means 27 is provided at a predetermined position of the apparatus main body 21 in the axial direction thereof. The light emitting means 27 is a plurality of light emitting bodies (light emitting portions) arranged in a straight line at predetermined intervals in the axial direction of the apparatus body 21.
28 is provided on a drive circuit unit 29 that drives the light emitting body 28. The light emitter 28 has a predetermined light amount such as an LED (light emitting diode), a semiconductor laser, a liquid crystal display device with a backlight, and an EL (electroluminescence), and can be mounted on a straight line. An annular external connection terminal 30 is provided at a predetermined position on the inner peripheral surface of the insertion hole 22 of the device body 21. On the other hand, fixed shaft 2
A connection terminal 31 corresponding to the external connection terminal 30 is provided at a predetermined location on the outer peripheral surface of 4. The external connection terminal 30 and the connection terminal 31 are rotatably provided on the connection terminal 31, and the connection member 3 is made of conductive balls or the like.
Conductive connection is made via 2. The connection terminal 31 is conductively connected to the control circuit section 34 via a connection wiring 33 provided inside the fixed shaft 24.

The outer periphery of the fixed shaft 24, which is the main body 21 of the apparatus.
A motor (rotating means) 35 is provided integrally with the apparatus main body 21 on the right end surface of the. The motor 35 is composed of an AC motor such as an induction motor, a DC motor such as a stepping motor, a linear motor, or an ultrasonic motor. The motor 35 is conductively connected to the control circuit section 34 via the connection wiring 33. The outer peripheral portion of the fixed shaft 24 and the motor 35
A rotary encoder 36 for detecting the rotation speed and the rotation speed of the motor 35 is provided on the right side of the. The rotary encoder 36 is connected to the control circuit section 34 via the connection wiring 33.
Are electrically conductively connected. An opening 25a for emitting light from the light emitting body 28 is provided on one end surface of the case 25, and a lens 37 is fitted in the opening 25a.

Next, referring to FIG. 4, a case where a two-dimensional image is displayed on the screen 38 using such an image display device will be described. First, the motor 35 is operated to rotate the apparatus main body 21 in the arrow R direction at a predetermined rotation speed. In this case, the rotary encoder 36 outputs a pulse for every constant rotation angle of the apparatus main body 21 to the control circuit section 34.
And the rotation speed of the apparatus main body 21 is kept constant. Next, a two-dimensional image signal for each scanning line according to the rotation angle of the light emitter 28 is applied to each light emitter 28,
Is emitted according to a two-dimensional image signal for each scanning line, and the light from each light-emitting body 28 is scanned from the upper part to the lower part on the screen 38 through the lens 37 provided in the opening 25a of the case 25, A two-dimensional image corresponding to the two-dimensional image signal is projected on the screen 38. That is, as shown in FIG. 5, when the light emitted from the light emitter 28 reaches a position on the uppermost pixel lines P _1,1 , P _1,2 ... P _{1, n} of the screen 38, 1 A two-dimensional image signal of the scanning line is applied to each light emitter 28, and the light emitter 28 emits light according to the signal,
The pixel lines P _1,1 , P _1,2 ... P _{1, n} are displayed. Next, the device main body 21 rotates in the R direction, and the emitted light of the light-emitting body 28 is emitted from the pixel lines P _2,1 , P _2,2 ...
When the position reaches P _{2, n} , the pixel lines P _2,1 , P
A two-dimensional image signal of _2,2 ... P2 _{, n} is applied to each light emitter 28 and displayed on the pixel lines _P2,1 , _P2,2 ... P2 _{, n} .
In this way, when the device body 21 rotates in the R direction,
An image is displayed on the screen 38 by applying a two-dimensional image signal to the light emitter 28. In this case, if the device body 21 is rotated 60 times per second, 60 2 per second is obtained.
A three-dimensional image is displayed, and a moving image without flicker similar to that of a television can be displayed.

As described above, in this image display device, a plurality of light-emitting bodies 2 arranged linearly in a direction orthogonal to the rotation direction at a predetermined position of the device body 21 rotatably provided.
Since the light emitting means 27 having the number 8 is provided, the light emitting means 27 can be returned to the original position only by rotating the apparatus main body 21, and the scanning mirror 5 is swung as in the conventional case shown in FIG. It is not necessary to return it to the original position, it is possible to prevent vibration due to a reaction at the time of swinging, and it is possible to reduce vibration. As a result, it is possible to prevent noise and image quality from deteriorating by greatly reducing the vibration of the device body 21, the light emitting means 27, etc. It is possible to reduce the breakdown by improving it. Further, since the device main body 21, the light emitting means 27 and the motor 35 are integrally formed, the handling is easy.

In the above embodiment, the apparatus main body 21 has a cylindrical shape. However, the present invention is not limited to this, and the insertion hole 22 may be formed in the center of a prism. Further, in the above-described embodiment, the connection member 32 made of a conductive ball or the like is rotatably provided on the connection terminal 31, but the present invention is not limited to this. For example, a conductive roller can be rotated on the connection terminal 31. Alternatively, a conductive brush may be provided on the connection terminal 31. Further, in the above-described embodiment, the motor 35 is provided integrally with the apparatus main body 21, but the present invention is not limited to this, and the motor 35 is provided separately from the apparatus main body 21, and the power of the motor 35 is provided via, for example, a belt or a gear. May be transmitted to the apparatus main body 21. When a liquid crystal display element with a backlight is used for the light-emitting body 28, the backlight does not have to be directly under the liquid crystal display element and may be illuminated via an optical component such as an optical fiber or a light guide plate. Further, if a ferroelectric or antiferroelectric liquid crystal display element is used for the liquid crystal display element, the response speed can be increased. Further, in the above-described embodiment, sequential scanning (non-interlace) in which one two-dimensional image is projected on the screen 38 by one scanning
However, the present invention is not limited to this, and every other image is projected on the screen 38 by the first scan, and the remaining every other image is projected on the screen 38 by the second scan. It is also possible to perform interlace scanning in which one two-dimensional image is projected on the screen 38 by scanning. Further, although the front projection type image display device has been described in the above embodiments, the present invention is not limited to this and may be a rear projection type image display device.

6 and 7 show a modification of the image display device according to the embodiment of the present invention. In this figure, the same reference numerals are given to the same names as those in FIGS. 1 and 2, and the description thereof will be omitted as appropriate. In this image display device, the light emitting means 27 are provided at three predetermined positions of the device main body 21. In this case, the light emitter 28a emits light and displays on the pixel lines P _1,1 , P _1,2 ... P _{1, n} . Next, the device main body 21 rotates, and the light emitter 28a moves from the pixel lines P _2,1 , P _2,2 ... P _{2, n} to the pixel lines P _{m, 1} , P _{m, 2.}
... _{Pm, n} are sequentially displayed, and then the light-emitting body 28b causes the pixel lines _P1,1 , _P1,2 ... P1 _{, n} to the pixel line _{Pm, 1} ,
P _{m, 2} ... P _{m, n} are sequentially displayed. This is the luminous body 28
Since it is repeatedly displayed in the order of a, 28b, and 28c, a high-definition image can be obtained. At this time, the pixel P _{k, i} (1
≤ k ≤ m, 1 ≤ i ≤ n) are the light emitters 28a, 28b, 2
Since it is displayed by synthesizing 8c, the display colors displayed in the pixels P _{k, i} in one screen period are the light emitting bodies 28a, 28b, 28.
It is possible to change the display for each c and display a halftone. On the other hand, if each of the light emitters 28 emits light of a single color, the scanning speed can be tripled to further reduce the flicker, or the rotation speed of the apparatus main body 21 can be reduced to one-third to reduce the light emission means 27. It is possible to give a margin to the operation speed. In addition, as shown in FIG. 8, it may be arranged obliquely with respect to the rotation direction of the apparatus main body 21. In this case, the lowermost light emitting body 28a ₁ of the light emitting body 28a displays P _{1, n} , and the device main body 21 displays R 1.
The two lower light emitters 28a ₁ and 28a ₂ rotate in the direction
Display _{2, n} and P _{1, n-1} . Further, the apparatus main body 21 is rotated, and the lower three light emitting bodies 28a ₁ , 28a ₂ , 28a ₃ display P _{3, n} , P _{2, n-1} , P _{1, n-2} . By sequentially displaying in this manner, a two-dimensional image can be displayed on the screen 38.

[0013]

As described above, according to the present invention, the light emitting means having a plurality of light emitting portions for continuously displaying a plurality of pixels in a direction orthogonal to the rotation direction by rotation is provided. The image can be displayed and the light emitting device can be returned to its original position simply by rotating the main body, and there is no need to oscillate the scanning mirror to return it to its original position as in the conventional case. Can be prevented and vibration can be reduced. As a result, by significantly reducing the vibration of the main body of the device, the light emitting means, etc., it is possible to prevent noise and image quality from deteriorating, dramatically improving the secular change in component mounting accuracy. By doing so, failures can be reduced. Further, when the light emitting means is arranged at a plurality of predetermined positions of the apparatus main body as in the second aspect of the invention, if the light emitting bodies of the respective light emitting means are made to emit light of different colors, the intermediate tone is obtained by rotation. It is possible to display, while if each light-emitter emits a single color, the scanning speed can be increased multiple times to further reduce the flicker, or the rotation speed of the main body of the device can be reduced to a plurality of times. A margin can be given to the operating speed of the light emitting means.

[Brief description of the drawings]

FIG. 1 is a sectional view of an image display device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 1;

FIG. 3 is a cross-sectional view showing a mounting structure of a device body and a fixed shaft in the image display device.

FIG. 4 is a schematic diagram for explaining the operation of the image display device.

FIG. 5 is a schematic view of a screen of the image display device.

FIG. 6 is a sectional view of a modified example of the image display device according to the embodiment of the present invention.

FIG. 7 is a sectional view taken along the line AA in FIG. 6;

FIG. 8 is a sectional view of another modified example of the image display device according to the embodiment of the present invention.

FIG. 9 is a sectional view of a conventional image display device.

[Explanation of symbols]

 21 device body 24 fixed shaft 27 light emitting means 28 light emitting body (light emitting portion) 29 drive circuit portion 34 control circuit portion 35 motor (rotating means)

Claims (4)

[Claims] 1. A device main body rotatably provided, a rotating means for rotating the device main body, and a plurality of pixels provided in the device main body in a direction orthogonal to a rotation direction of the device main body. An image display device comprising: a light emitting unit having a plurality of light emitting units for displaying. 2. The image display device according to claim 1, wherein the light emitting means are arranged at a plurality of predetermined positions of the device body. 3. The image display device according to claim 1, wherein the light emitting portion of the light emitting means is arranged in a direction orthogonal to a rotation direction of the device body. 4. The image display device according to claim 1, wherein the pixel is a screen provided apart from the main body of the device.