JP2002023659A - Picture display device, and control circuit used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the safety at the time a color disc is abnormal in a picture display device using a rotary color disc. SOLUTION: This picture display device is provided with a control means which controls a motor which rotationally drives a color disc and which stops or decelerates the rotation of the disc by judging the abnormality of the disc while detecting the state of a color filter or the rotational state of the disc and the device stops or decelerates the rotation of the disc and, also, stops the displaying of a picture automatically when the disc is abnormal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display technique for forming an image by irradiating light from a light source side to a transmissive or reflective liquid crystal panel or a flannel such as a minute reflective mirror, and more particularly to a color display technique. The present invention relates to an image display technique for reproducing a color image by sequentially modulating the amount of light.

[0002]

2. Description of the Related Art For example, a conventional projection display device using a liquid crystal panel can easily achieve a reduction in size and weight as compared with a CRT (cathode ray tube) type device. Also, CRT
Unlike the method, convergence adjustment is easy because it is not affected by size distortion or terrestrial magnetism. Further, wide color reproducibility can be realized by the characteristics of the light source and the optical design. Furthermore, to improve the resolution degradation of moving images, the response speed of the liquid crystal has been improved,
Efforts for higher performance such as improvement of contrast, improvement of light utilization rate by effective use of excluded polarization components, and improvement of pixel aperture ratio have been actively made. Further, there has been proposed a projection-type display device using a minute reflection mirror to improve the contrast and the light utilization rate. For example, US Pat. Nos. 5,442,411 (publication), US Pat. No. 5,280,277 (publication), and US Pat.
Nos. 68611 (gazette), 5680180 (gazette), and JP-A-10-48542. In this method, the reflection surface of the micromirror is two-dimensionally arranged on the cells of the memory array, and the inclination of the reflection surface of the micromirror is controlled by electrostatic force to change the direction of light reflection from the light source and display an image. Is what you do. The gradation expression by this is performed within the frame period (for example, 16.7 to 20).
ms), the on / off time of the micromirror whose response speed is on the order of 10 to 20 μs is controlled, and the viewer of the image integrates the light emission time as an analog value within the frame period based on the visual reaction speed. The key can be recognized. Furthermore, for reproduction of R, G, and B, applications and products such as a case where a single micromirror is used to express in a time-division manner and a case where three micromirrors are provided for each color to secure a luminance level. The configuration is in accordance with the cost. In the case of a projection display device using such a panel unit, as a light source,
It is a point light source in terms of light-collecting properties, has excellent spectral spectrum, has high-efficiency light-emitting characteristics, has a long service life, and has, above all, uniform light intensity with little uneven emission. In practice, a xenon lamp, a metal halide lamp, or the like is used.

FIG. 5 shows a configuration example of a conventional projection display device. In this example, a single image display device is used as a panel unit to represent R, G, and B in color sequence. 1 is an input terminal for inputting a video signal, 2 and 3 are synchronization signal input terminals for inputting vertical and horizontal synchronization signals of the video signal, 4 is a timing generator for generating various timing signals, and 5 is an image display device 17. An image display device control unit 10 for controlling a color disk in which color filters that transmit the respective components of R, G, and B from white light are arranged in a circle;
Reference numeral 11 denotes a motor for rotating the color disk, 9 denotes a color disk unit control unit for driving and controlling the motor 11, 12 denotes a sensor for detecting the rotational position of the color disk, and 13 denotes an AMP (amplifier) for amplifying a signal from the sensor. ) And 14 are lamps as light sources, 15 and 16 are condenser lenses, 17 is an image display device (panel section) such as a liquid crystal panel or a reflective display device, 18 is a projection lens, and 19 is a screen. FIG. 6 is a supplementary explanatory diagram of the conventional example. In FIG. 5, the color disk unit control unit 9 synchronizes with the vertical synchronizing signal Vsync of the input video signal and within one cycle,
Control is performed so that each of the GB color filters passes the light beam spot at least once. Also, the sensor 12, A
The light intensity information 13a of the leak light of the light beam transmitted through the color disk unit (including the color filter 10 and the motor 11) is detected by the MP13. In synchronization with each color component period based on the light intensity information 13a, the image display device controller 5 modulates the light applied to the image display device 17 in accordance with the video signal. The reflected light beam or transmitted light beam modulated by the image display device 17 is projected onto a screen 19 by a projection lens 18 to reproduce a color image.
Furthermore, in the method of performing image reproduction in the color sequence described above by performing color-sequential color switching at a high speed or devising a configuration of a color filter, a person watching the image blinks his / her neck at the moment of blinking. At the moment when the image is shaken or at the moment when a moving image is reproduced, the phenomenon that the image looks unnatural or the color flicker is felt is prevented. Also, during the color switching period, which is a mixed color area,
Since the use of light for image reproduction is avoided, the luminance of the reproduced image deteriorates. This is addressed by reducing the diameter of the focused beam on the color disk.

[0004]

In order to prevent unnaturalness of an image and a color flicker phenomenon, it is effective to rotate a color filter at a higher speed. Damage to the disk and increase in vibration are expected. SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, to further improve the prior art, and to provide a technique capable of improving image quality while ensuring safety.

[0005]

According to the present invention, there is provided an image display apparatus for displaying an image by modulating light from a light source by a panel unit, comprising a plurality of color filters. Are arranged circumferentially, and by rotation, a color disk for sequentially separating color component light corresponding to the color filter from light on the light source side incident on the color filter, a motor for rotating and driving the color disk, and the color Control means having a configuration for detecting the state of the filter or the rotation state of the color disk to determine an abnormality and controlling to stop or decelerate the rotation of the motor; and an image input signal for the color component light from the color filter. A panel section that modulates based on
Means for guiding the light emitted from the panel unit to the display unit, and performs image display based on the color component light obtained by time-dividing a predetermined display period of the image signal. Is stopped or decelerated, and the image display is automatically stopped. 2) In the above 1), the control means may detect the transmitted light or reflected light with respect to the color filter, or the output signal thereof, or the vibration of the color disk to determine the state of the color filter or the rotational state of the color disk. It is configured to detect. 3) In the above 1), the control means has a second light source different from the light source, and detects the abnormality by a change in transmitted light or reflected light of the light from the light source to the color filter. . 4) In the above 1), 2) or 3), the control means
The detected transmitted light or reflected light, or the output signal thereof, or each level of the vibration, or the amount of change per unit time of the transmitted light, the reflected light, the output signal, or the vibration is set, respectively. The above-mentioned abnormality is determined by comparing with a reference value. 5) In the above item 4), the control means may be configured such that the set reference value is a value equal to or lower than the level of light incident on the color filter and equal to or higher than the level of transmitted light. 6) In the above item 1), the control means may control the detected transmitted light or reflected light or an output signal thereof,
Alternatively, a configuration is provided that includes a detection unit that detects the vibration, and a comparison circuit that compares an output from the detection unit with a set reference value to determine the abnormality. 7) Control of a motor for rotating a color disk, which is used in an image display device that modulates light from the light source side by a panel unit to display an image and sequentially separates color component light from incident light with a color filter by rotation. A circuit, a signal obtained from transmitted light or reflected light with respect to the color filter, or a signal obtained from vibration of the color disk is input, and the rotation of the motor is compared with a set reference value to determine the state of the color filter or In accordance with the rotation state of the color disk, a signal for controlling to stop or decelerate is formed.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. (First Embodiment) FIG. 1 shows a first embodiment of the present invention.
1 is a configuration example of a projection display device using a reflective display device for a panel unit. FIG. 7 and FIG. 8 are waveform diagrams showing the operation timing in each processing unit. FIG. 9 is a configuration diagram of a color filter. In this embodiment, a standard television broadcast mainly for displaying a moving image is assumed as an input video signal, but for simplicity, a case where the image frame frequency Vsync is 60 Hz will be described. . The present invention includes the case where the image frame rate for the input image is converted, within the technical scope thereof. In this embodiment, a light flux in which a specific color component is extracted in color sequence from white light of a light source is projected onto a reflective display device, and light is modulated by the reflective display device based on image information of the corresponding color component. To reproduce the image. Also, as the primary color components used,
For the sake of simplicity, a case where red (R), green (G), and blue (B) are used will be described. The number of time divisions in the image frame period indicates a case where the three primary color components make at least one cycle. Further, in this embodiment, the color filter passing through the beam spot is switched by mechanically rotating a color disk formed of three color filters. However, the color filter shape, the filter characteristics, and the color The number and the like are not limited to this, and may be different from the present embodiment. The image display device to be used may be any device that can perform the gradation expression method by the time distribution control (usually, the response speed is several tens μs or less), and may be, for example, a ferroelectric liquid crystal. . In the present embodiment, details of an optical system such as a light emission characteristic of a light source used for image reproduction, a lens configuration,
The details of the control of the image display device will not be described.

In FIG. 1, 1 is an input terminal for inputting a video signal, 2 is a synchronizing signal input terminal for inputting a vertical synchronizing signal Vsync, and 3 is a synchronizing signal input for inputting a horizontal synchronizing signal Hsync. Terminals 4, a timing generation circuit, 17 an image display device, 5 an image display device control unit, 6 a threshold setting unit, 8 a first comparator, 7 a second comparator, 10 a light source A color disc unit formed by arranging color filters for transmitting the respective components of R, G, and B from the white light in a circumferential shape; 11, a motor for rotating the color disc 10; A color disk unit controller for controlling the drive, 12 a sensor for detecting light intensity, 13 an AMP (amplifier) for amplifying the detected signal, 14 a lamp used as a light source, 15 and 16 condenser lenses, 7 LCD panel or reflective type display device such as an image display device (panel), 18 projection lens, 19 is a screen. The color disk 10,
The motor 11 forms a color disk unit.

The operation of the present invention will be described below with reference to FIGS. 1, 7, 8 and 9. FIGS. 7 and 8 are schematic waveform diagrams of signals in the processing block and the timing charts of the on / off operation of the image display device 17 in the embodiment of the present invention. FIG. Is in the abnormal mode. The processing technique for image reproduction according to this embodiment is basically the same as that described in Japanese Patent Application Laid-Open No. 10-48542. One frame period (hereinafter, V
sync), the light beam spot condensed by the condenser lens 15 is R, G, B of the color disk 10.
The motor 11 is rotated so as to pass through each color filter at least once and to synchronize with the input video signal. According to the position information of the color filter passing through the light beam spot, according to the gradation information of the color component corresponding to the input video signal,
The image display device 1 is controlled by the image display device controller 5.
The light irradiated to 7 is modulated for each display pixel. The light beam that has passed through the color filter by the above processing is light-modulated by the image display device 17 and then projected on the screen 19 by the projection lens 18. The observer of the screen 19
Even in the case of an image displayed in color sequence, image reproduction is achieved by paying attention to the responsiveness of the visibility and giving an illusion as if the respective colors are superimposed. On the other hand, there is an individual difference in responsiveness of visibility, but deterioration of an image can be prevented by increasing the number of rounds of each color filter R, G, B in one cycle of Vsync.

Hereinafter, the light intensity of the light leaked from the lamp 14 after passing through the color disk 10 is measured by the sensor 1.
The case of detection or detection in 2 will be described. FIG.
(A) shows a configuration state of the color disk 10. Also, in FIG.
An example of the waveform state of the light intensity information 13a obtained by performing the amplitude correction with the light intensity of the leakage light in the state (a) is shown. Sensor 1
The output signal 2 changes depending on the arrangement condition of the sensor 12, the light emission amount of the light source, and the like, but the amplitude can be corrected by the AMP 13. Further, in the color filter switching area, a color mixture occurs during a period Toff determined by the size of the light beam spot and the rotation speed of the color disk. Therefore, during the Toff period, the image display device controller 5 controls the image display device 17. Is turned off to operate so as to avoid the use of light for image reproduction. As a result, the light use efficiency is deteriorated, but the deterioration of the reproduced image can be prevented.
Here, each color filter R, G, B in one cycle of Vsync
Is performed N times (where N is an integer and indicates the number of times), a period Tcut not used for image reproduction is expressed by the following equation 1.

[0010]

Tcut = 3 · Toff · N As is clear from the above, increasing the number of rounds N for the purpose of improving image reproducibility results in an increase in the Tcut period, that is, deterioration in light use efficiency. . In order to shorten the Toff period in order to improve the light use efficiency, the light beam spot size is reduced or the rotation speed of the color disk 10 is increased. For that purpose, it is necessary to make the configuration conditions of the color disk 10, the optical member, and the like suitable conditions. Here, increasing the rotational speed (angular speed) of the color disk 10 causes an increase in centrifugal force due to the weight of the color disk 10 while increasing the noise source and deteriorating the machine life. 10 is required to improve the structural strength.

Next, the threshold value th in the threshold value setting section 6
The setting method of 1 will be described. Paying attention to the light intensity information 13a of the leaked light at the installation position of the sensor 12, the light intensity information of the light intensity information 13a not less than the value of the intensity information 13a of the light transmitted through each color filter and the color disk 10 is not attached. level,
That is, the threshold value th1 is set so as to fall within a range not exceeding the light level incident on the color filter. Here, the light intensity by the lamp 7 is not always kept constant, and the light intensity is deteriorated due to the life of the lamp, a noise component of the lamp driving power source, and unevenness of light emission of the lamp itself. Following the aging of 13a,
The threshold value th1 may be set at any time. If the light emission performance when the life of the lamp 7 expires can be set in advance, the threshold value th1 may be fixed. When the fixed value is used, the cost can be reduced by simplifying the circuit configuration. The magnitude comparison between the light intensity information 13a obtained by the above process and the threshold value th1 is performed by the first comparator 8 (8a). For example, as the magnitude judgment 8a, FIG.
In the case of the color disk 10 shown in FIG.
If the level of a is lower than the threshold value th1 (logic H level), and as shown in FIG. 9B, in the case of the color disk 10 in which a part of the R color filter is missing, ,
As shown in FIG. 8, the operation is performed such that the magnitude judgment 8a indicates that the light intensity information 13a has exceeded the threshold value th1 in the missing R color filter portion (logic L level). The information of the magnitude judgment 8a is obtained, and the color disk controller 9 controls the rotation of the motor 10. That is, the magnitude judgment 8a is always H
When in the level, command normal rotation,
When the L level is detected or detected, the rotation operation is stopped instantaneously, and all the operations of the image display processing are stopped.

According to the structure of the above embodiment, the color disk 10 is moved from the state shown in FIG. 9A to the state shown in FIG. In the case of (b), it is possible to immediately stop or decelerate the rotation of the driving motor and stop all processing for image reproduction. As a result, it is possible to minimize an increase in damage such as device destruction or injury due to a missing color filter. This makes it possible to provide a safe image display device. Further, in the case of the present embodiment, the threshold value setting unit 6 further sets and outputs light intensity information enough to identify the light intensity information 13a when passing through a specific color filter as the threshold value th2. For example, as shown in FIG. 7, the threshold th2 is set so that the light intensity information 13a of the G color filter is equal to or less than the light intensity information 13a of the other R and B filters. As a result, the second comparator 7 outputs the light intensity information 1
3a and the magnitude information 7a of the threshold value th2 can be output. In this embodiment, the magnitude information 7a is stored in the color disk 10
May be used as the rotation position information. Thus, the sensor 12 can be used for both the above-described detection of the destruction and the generation of the rotational position information of the color disk 10, thereby simplifying the component configuration. Of course, another sensor or means other than the sensor 12 may be used for detecting the rotational position of the color disk 10. Further, in the present embodiment, the sensor 12 uses the light flux from the lamp 7 used for image display, but the present invention is not limited to this, and another dedicated light source may be used, for example. In the case of using a dedicated light source, there is an advantage that the degree of freedom of design and the detection accuracy can be easily improved. Further, the present invention may be configured to use the amount of change (differential amount) of the light intensity per unit time as the light intensity information 13a. Furthermore, the present invention is included in the scope of the present invention as long as it is a combination of a color disk unit and an image display device that reproduces colors in color sequence, and is not limited to the configuration of the above embodiment.

(Second Embodiment) FIG. 2 shows a second embodiment of the present invention. In the configuration of FIG. 2, the portions denoted by the same reference numerals as in FIG. 1 are the same as those in FIG. 1, and description thereof will be omitted to avoid redundant description. In the second embodiment, instead of the leak light of the light beam transmitted through the color disk, the light beam reflected from the color disk 10 is reflected by the light beam from the lamp 14 and the light beam collected by the condenser lens 15. Light is detected by the sensor 12. The color disk 10 is shown in FIG.
In the configuration shown by, the sensor 12 and the AMP 13 detect or detect the light intensity according to the luminance of the lamp 14 and the reflectance of the color filter of the color disk 10 at the light wavelength component,
The light intensity information 13a subjected to the signal amplitude correction is obtained. In the threshold value setting unit 6, the light intensity information 13 when passing through each color filter is set.
The threshold value th1 is set so as to be equal to or less than the minimum value of a. In this case, the threshold value th1 may be changed following the change with time of the lamp 14, or
If the change over time, the performance at the time of life, and the like are known, it is also possible to set a fixed value. Light intensity information 13a and threshold value th1
Is compared by the first comparator 8, and the comparison result information 8
The color disk unit control unit 9 controls the rotation operation of the motor 11 based on a. For example, when the light intensity information 13a becomes smaller than the threshold th1, the rotation of the motor 11 is stopped. Further, other operations for image reproduction, such as the stop of the light emission of the lamp 7, may be stopped together. According to the configuration of the second embodiment, unexpected disturbances or deterioration of the structure over time during image reproduction are performed.
For example, when the state of the color disk 10 changes from the state shown in FIG. 9A to the state shown in FIG.
2, the process for reproducing the image can be stopped at the timing when the light change is detected or detected. Further, the light intensity information 13 is obtained by the same processing as shown in the first embodiment.
It is also possible to detect the rotational position of the color disk 10 using a. In addition, in the present configuration, since detection or detection is performed using unnecessary light that is not used for image reproduction, the degree of freedom in configuration is high. Further, since the light is unnecessary light, the light can be detected or detected with light in the wavelength component region of non-visible light, and erroneous detection or detection due to external light can be reduced.

(Third Embodiment) FIG. 3 shows a third embodiment of the present invention. In the configuration of FIG. 3, the same reference numerals as those in the first and second embodiments will not be described repeatedly.
In the third embodiment, a light emitter 20 is used as a light source for detecting the state of a color filter, separately from the lamp 7 for reproducing an image. The sensor 12 detects or detects the light intensity of light reflected by the light emitter 20. According to the third embodiment, since the detection configuration uses light that is not for image reproduction, the luminous body 20 as a light source thereof can be used as a wavelength component of light in the non-visible light range, such as an infrared light emitting diode. It is possible to select one that contains many components, has a stable light-emitting characteristic, and has a luminance that sufficiently satisfies the light-receiving sensitivity of the sensor 12, provides stable performance over a long period, and prevents erroneous detection due to external light. can do. Also, the light emitter 20 and the sensor 1
2 is arranged in a combined state, so that it is easy to assemble and adjust.

(Fourth Embodiment) FIG. 4 shows a fourth embodiment of the present invention. The present embodiment is configured to detect a mechanical vibration generated in the color disk unit to detect the state of the color filter or the rotation state of the color disk to determine an abnormality. Normally, when a color filter or a color disk is damaged or the like, the dynamic balance at the time of rotation is disrupted and centrifugal force is generated, and mechanical vibration increases. The mechanical vibration is detected by the vibration detecting unit 21, and the vibration amount information 21 a as an output is
Is compared with a threshold value. Threshold setting section 6
Then, a threshold th3 serving as a reference for the comparison is generated and output. Further, as the vibration detecting unit 21, for example, an acceleration sensor, an impact sensor, or the like is used. The threshold value setting unit 6 sets the threshold value th3 to be equal to or greater than the absolute amount of the vibration amount information 21a generated during the normal rotation operation for the purpose of image reproduction.
Is fixed or variably set. The third comparator 21 outputs magnitude information of the absolute amount of the vibration amount information 21a and the threshold value th3 (22a). The third comparator 22 compares the magnitude of the vibration amount information 21a with the threshold th3,
The color disk unit controller 9 controls the rotation of the motor 11 based on the comparison result information. For example, when the vibration amount information 21a is larger than the threshold th3, the rotation of the motor 11 is stopped. Further, other operations for image reproduction, such as the stop of the light emission of the lamp 7, may be stopped together.
According to the fourth embodiment, since an abnormality can be detected directly and quickly, it is possible to instantaneously respond to an abnormality in the system, such as an instantaneous stop of motor rotation, and to prevent damage to components such as a color filter. High probability of prevention. For example, when the center of gravity of the color disk 10 is broken even by a very small amount due to, for example, displacement of the mounting portion of the color filter with the motor rotation unit, the vibration amount information 21a increases due to unbalance rotation caused by centrifugal force. By setting the threshold value th3 optimally, the increase in the vibration amount can be detected. Thus, the rotation of the motor can be stopped before the color filter is destroyed, and safety can be ensured.

[0016]

According to the present invention, in an image display apparatus which performs image display by modulating light from the light source side by a panel section, flicker and the like can be suppressed in a state where safety is ensured, and image quality can be improved. Further, the light use efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram showing a second embodiment of the present invention.

FIG. 3 is a diagram showing a third embodiment of the present invention.

FIG. 4 is a diagram showing a fourth embodiment of the present invention.

FIG. 5 is a diagram illustrating a configuration example of a conventional image display device.

FIG. 6 is a waveform diagram for supplementarily explaining a conventional example.

FIG. 7 is a waveform diagram illustrating the operation of the present invention.

FIG. 8 is a waveform diagram illustrating the operation of the present invention.

FIG. 9 is an explanatory diagram of a state of a color disk.

[Explanation of symbols]

1, 2, 3 ... input terminal, 4 ... timing generator, 5
... image display device control unit 6 ... threshold value setting unit
7 1st comparator, 8 2nd comparator, 9 ... color disk unit control part, 10 ... color disk, 11 ... motor, 12 ... sensor, 13 ... AMP, 14 ... lamp, 15, 16 ... capacitor Lenses, 17: Image display device, 18: Projection lens, 19 screens.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G02F 1/13357 G03B 21/00 E 5C080 G03B 21/00 21/14 Z 5G435 21/14 G09G 3/20 670N G09G 3/20 670 680C 680 H04N 5/74 A H04N 5/74 9/31 C 9/31 G02F 1/1335 530 F term (reference) 2H088 EA13 EA16 EA18 FA17 FA30 HA12 HA28 MA20 2H091 FA02Z FD26 LA01 MA07 2H093 NC NC64 ND02 ND17 ND60 NG02 5C058 BA35 EA00 EA12 EA21 EA26 EA27 EA51 5C060 GB00 HC01 HC17 5C080 AA10 AA18 CC03 CC10 DD06 DD17 FF07 JJ02 JJ04 JJ06 5G435 AA00 BB12 BB16 BB12 GG01GG13

Claims (7)

[Claims] 1. An image display device for modulating light from a light source side with a panel unit to display an image, wherein a plurality of color filters are arranged in a circumferential shape, and the light source side incident on the color filters by rotation is provided. A color disk for sequentially separating the color component light corresponding to the color filter from the light of the color filter; a motor for rotating and driving the color disk; detecting a state of the color filter or a rotation state of the color disk to determine abnormality; A control unit configured to control to stop or decelerate the rotation of the motor; a panel unit that modulates the color component light from the color filter based on an image input signal; and a display unit that emits light from the panel unit. Means for guiding the image signal, performing image display based on the color component light obtained by time-dividing a predetermined display period of the image signal, and stopping or decelerating the rotation of the color disk and automatically displaying the image in the case of the abnormality. Target The image display apparatus being characterized in that so as to stop. 2. The control means according to claim 1, wherein said control means is configured to transmit or reflect light to or from said color filter, or an output signal thereof.
2. The image display device according to claim 1, wherein a state of the color filter or a rotation state of the color disk is detected by detecting vibration of the color disk. 3. The control means according to claim 2, wherein said control means is a second light source different from said light source.
The image display device according to claim 1, further comprising: a light source configured to detect the abnormality based on a change in transmitted light or reflected light of the light from the light source with respect to the color filter. 4. The control means according to claim 1, wherein said detected transmitted light or reflected light, or an output signal thereof, or each level of said vibration, or said transmitted light, said reflected light, said output signal, or said vibration. 4. The image display device according to claim 1, wherein the abnormality is determined by comparing the amount of change per unit time with a set reference value. 5. An image display apparatus according to claim 4, wherein said control means sets the reference value to a value equal to or less than a level of light incident on the color filter and equal to or greater than a level of transmitted light. 6. A control unit for detecting the transmitted light or reflected light, or an output signal based on the detected light or reflected light, or a detection unit for detecting the vibration, and comparing an output from the detection unit with a set reference value to determine whether the abnormality has occurred. The image display device according to claim 1, further comprising: a comparison circuit that determines whether or not the image is displayed. 7. An image display device for displaying an image by modulating light from a light source side by a panel unit, and for rotating a color disk for sequentially separating color component light from incident light by a color filter by rotation. A control circuit for a motor, which receives a signal obtained from transmitted light or reflected light to the color filter or a signal obtained from vibration of a color disk, and compares the rotation of the motor with the set reference value to determine the rotation of the color filter. A control circuit for forming a control signal corresponding to the state of the color disk or the rotation state of the color disk.