JP2001183741A - Dimming means used for color sequential illumination system, rotating color filter using this means, and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such problem that it is difficult to control the color tone of light outputted by reducing the intensity of specific color light in the constitution of a color sequential illumination system where a white light source where color is switched in a time series is used and to solve another problem that it is difficult to adjust the white balance and the color tone of a display picture in combining this illumination system and display elements in the color sequential system to constitute a display device. SOLUTION: A light source, a means which forms specific color light changing in the direction of the time base from light radiated from the light source, a light shielding means which is inserted to an optical path to adjust the intensity of passing light, and a means which selectively inserts the light shielding means only for a required short period are provided. The light shielding means acts on only specific color light to dim it out, and thus the color tone of illuminating light to be outputted is controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color sequential illumination system for switching a white light at high speed to form a plurality of color lights output in time series and a color filter for selectively separating a specific color light. The present invention relates to a rotary color filter capable of switching the color of light passing therethrough in a time series by being arranged and rotated, and a display device comprising the color filter and a light-receiving display element of a color sequential display system.

[0002]

2. Description of the Related Art A light valve or a spatial light modulation element is widely known as a light receiving type display element which does not emit light by itself and spatially modulates light by receiving illumination light from the outside. A liquid crystal panel is a typical example of a light receiving type display device, and is used for various purposes such as a direct view type display device using a backlight, and a projection type display device (projector) using a high brightness light source and a projection lens in combination. Has been

A method of forming a color image using a light receiving type display element includes a method of using three display elements corresponding to three primary color original images, and a mosaic color filter on one display element. There is known a method of forming and using RGB trio pixels.

[0004] Apart from these, there is a system generally called a color sequential display system. In this method, RGB original images are displayed in chronological order at high speed by using a single light-receiving display element for black-and-white display, and the color of the illumination light is switched in synchronization with the display of each primary color image to be illuminated. This is a method in which when integrated, it is detected as a color image.

When a color sequential display device is constructed, a generally used light source emits white light, so that a color sequential illumination system is required. The color-sequential illumination system refers to an optical system that collects white emitted light, sequentially switches the emitted light to different color light at high speed, and forms illumination light of different colors in the time axis direction. For example, a rotary color filter is used for this purpose.

FIGS. 11A and 11B show an example of a conventional configuration of a rotary color filter 100 used in a color sequential display device. The rotation support 101 is provided at the center 10.
At 1A, it is attached to a rotation drive device (not shown) such as a motor and rotates at high speed. The rotating support 101 is a “hub”
, Which is generally disk-shaped and rotationally symmetric. Around the rotating support 101, arc-shaped color filters are arranged. For example, when it is desired to switch to the three primary colors of red (R), green (G), and blue (B), the outer periphery 36 of the rotary support 101
0 degree is divided into three parts, red filter 102, green filter 1
03, a blue filter 104 may be arranged.

If the rotary color filter 100 is inserted into the optical path of the illumination light and is rotated at a high speed by a motor, the illumination light passing through the optical filter passes through the color filters 102, 10 inserted into the optical path.
3, 104, and red, green, and blue color lights are sequentially formed in time series.

FIG. 12 shows an example of a conventional structure of a color sequential display device. The light source 110 forms a spot by converging the illumination light emitted by the light emitter 110A, and the rotary color filter 100 is inserted and arranged in the spot. The rotary color filter 100 is connected to a motor 111, and the motor 111 is rotated by a drive current synchronized with a video signal supplied from the outside. Rotary color filter 100
Passes through the condenser lens 112 and illuminates the light-receiving color sequential display device 113.

The display element 113 spatially modulates light to form an optical image 113A. For example, a transmissive liquid crystal panel is used. Original images of red, green, and blue are displayed in chronological order according to a video signal supplied from the outside, and the original image is displayed by the operation of the motor 111 and the rotary color filter 100 that are driven to rotate in synchronization with the original images. Illumination light of color light corresponding to the color of the image is supplied in time series, and as a result, a full-color image can be presented.

[0010] Optical image 11 formed on display element 113
In the case of 3A, there is a case where the image is directly observed by a direct viewing method, and a case where a projector type display device is provided with a projection lens which enlarges and projects thereafter.

[0011]

The conventional color sequential illumination system is designed to sequentially and selectively separate, for example, red, green, and blue primary color light and obtain white light that is integrated in the time direction based on vision. It may be difficult to freely adjust and change the white balance.

When arranging arc-shaped color filters,
Properly dividing the effective prospect angle (hereinafter, segment angle) of each arc segment with respect to the center of rotation among the red, green, and blue color lights can increase the intensity of any color light,
(Japanese Unexamined Patent Publication No. 9-27963)
Issue publication). However, in this method, it is difficult to reduce the light amount to a desired level if there is a restriction on the segment angle that can be reduced for a specific color whose light amount is to be reduced. That is, if there is a restriction on the distribution of time for switching colors by one rotation or the time required to irradiate each color light, these restrictions and the segment angle are changed to adjust the intensity of the color light. Are inconsistent with each other, so that the degree of freedom of design that satisfies both of these restrictions and white balance may not be obtained.

For example, when the time required for displaying the original image corresponding to each color light is restricted by the display element to be combined, the size of the corresponding segment angle is determined by the irradiation time of the predetermined color light. Its angle is limited to be longer than the time constraint.

As an example, an angle range of 360 degrees per rotation is set to 3
If the white balance is obtained by equally dividing the segment angles of the red, green, and blue filters by 120 degrees,
The time for presenting the red, green, and blue original images on the display element is obtained by dividing the time required for one rotation of the rotary color filter into three equal parts, and using the equal time corresponding to the original image of any color. What is necessary is just to show each image.

On the other hand, when it is desired to obtain a white balance in which the green component of the light source is strong and the green color light is reduced to about half, for example, the segment angle of the green color filter is set to 72 degrees, and the red and blue color filters are set. Need to be twice as large as 144 degrees for green. In this case, in the display element used in combination, the time allowed to display the green original image is given only about half the time for each of the red and blue original images. When such a restriction occurs, in the procedure for displaying the green original image, sufficient data transfer time and response time of the display device cannot be obtained, so that the gradation display of the green original image is insufficient or insufficient. It causes problems such as accuracy.

In order to adjust the display performance and driving conditions of the three primary colors of red, green, and blue, the time for displaying these in time series, that is, the time for switching and illuminating each color light by the rotary color filter. It is clear that it is better that they are equal to each other. Therefore, it is desired that the intensity of any color light can be arbitrarily adjusted without largely changing the segment angle of each color filter determined on the rotary color filter.

In order to solve the above-mentioned problems, Japanese Unexamined Patent Publication No.
No. 27963 discloses a method of reducing the wavelength range of a strong color light filter and a method of expanding the wavelength range of a weak color light filter.

Generally, a dichroic mirror composed of a multilayer film is often used as a color filter. In this dichroic mirror, reducing the passing light amount by narrowing the wavelength band of the passing color light means increasing the number of layers of the multilayer film and increasing the cost, and configuring a film that reduces the light amount beyond a predetermined narrow band. However, there is a problem in performance and mass productivity of the multilayer film.

It is also conceivable to reduce the amount of light passing through by reducing the level of transmittance or reflectance in the passing wavelength band, but in this case, the absolute reproducibility of the reduced amount of light is poor and the characteristics of the multilayer film are poor. However, there are problems such as fluctuations, large ripples in the characteristics in the wavelength band direction, no stable performance, and difficulty in finely adjusting the amount of transmitted light with a high degree of freedom.

As described above, in the conventional rotary color filter and the display device of the color sequential system using the same, a high degree of freedom is required when changing the color tone of the light by reducing the light amount of the specific color light. By the way, there was no other simple means to obtain color balance without causing any adverse effects.

In these rotary type color filters and color sequential type display devices using the same, a metal halide lamp, an ultra-high pressure mercury lamp, or the like is often used as a light source. It is known that these lamps have more green components than red and blue components in particular. Therefore, when using such a lamp, it is necessary to reduce only the intensity of the green color light without reducing the intensity of the other color lights, but for a reason described above, the specific color light can be simply and easily provided with a high degree of freedom. It is difficult to reduce the amount of light. As a result, greenish white light is formed, and the white balance of the displayed image cannot be sufficiently obtained. For this reason, problems such as poor image quality have occurred.

The rotary color filter of the present invention solves these problems, and provides a simple means for adjusting the light amount of only a specific color light whose light amount is desired to be reduced with a high degree of freedom. is there. If a display device of a color sequential system is configured using the rotary color filter of the present invention, the color tone of a displayed image can be freely adjusted, so that a high-quality color image can be obtained.

[0023]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a dimming means according to the present invention is provided in a color sequential illumination system which emits at least two colors of light which change in time series. A light source that emits light containing light, a unit that forms a specific color light that changes in the time axis direction from the light emitted by the light source, a light blocking unit that is inserted into the optical path to adjust the intensity of the passing light, and a light blocking unit. Means for selectively inserting the light only for a very short time, and the light shielding means acts only on the specific color light out of the light emitted from the light source to reduce the light, and adjusts the color tone of the output illumination light. Things.

In order to further solve the above-mentioned problems, a rotary color filter according to the present invention is a rotary color filter which is mainly inserted into an optical path of white light and rotates to form different color light in time series. A rotating support, two or more color filters arranged around the rotating support, and light blocking means for blocking a part of light passing through the color filter; It is configured to selectively act on only some of the color lights, and adjusts the color tone of the output light.

A rotary color filter for selectively separating three primary colors of red (R), green (G) and blue (B), wherein the light-shielding means is at least one of R, G and B colors. It is more preferable to reduce the amount of light passing through a specific color light selectively formed in the filter unit, and to adjust the color tone when the R, G, and B color lights output in time series are combined.

It is more preferable that the light-shielding means shields a certain percentage of passing light along the rotating circumferential direction of the rotary color filter.

The light-shielding means controls the amount of light required for the cross-sectional spot of the light passing through the rotary color filter in both the inner circumferential direction and the outer circumferential direction along the circumferential direction in which the rotary color filter rotates. It is better to shield the light.

In order to further solve the above-mentioned problems, a rotary color filter according to the present invention is a rotary color filter which is mainly inserted into an optical path of white light and rotates to form different color light in time series. The rotating color filter has a rotating support, two or more color filters arranged around the rotating support, and light blocking means for blocking a part of light passing through the color filter,
The light blocking means is configured to selectively act on at least a part of the color light of the color filter, and is configured to be attachable to and detachable from the rotary color filter, and adjusts the color tone of the output light. Things.

A rotary color filter for selectively separating three primary color lights of red (R), green (G), and blue (B), wherein the light shielding means is at least one of R, G, and B colors. It is more preferable to reduce the amount of light passing through a specific color light selectively added to the filter unit, and adjust the color tone when combining the R, G, and B color lights output in time series.

It is more preferable that the light-shielding means shields a certain percentage of passing light along the rotating circumferential direction of the rotary color filter.

The light-shielding means controls the amount of light required for the cross-sectional spot of the light passing through the rotary color filter in both the inner circumferential direction and the outer circumferential direction along the rotating circumferential direction of the rotary color filter. It is better to shield the light.

In order to further solve the above problems, the display device of the present invention comprises a light receiving type color display element for displaying at least two or more original images in time series, and illumination light supplied to the color display element. And a rotary color filter that is inserted into the optical path between the light source and the color display element to make the color of the illumination light correspond to the color of the original image formed on the color display element. Has a rotating support, two or more color filters arranged around the rotating support, and light blocking means for blocking a part of light passing through the color filter, and the light blocking means passes through the color filter. The color display device is configured to selectively act on at least a part of light, and adjusts a color tone of a color image presented by the color display element.

The color display elements include red (R), green (G),
An original image of three primary colors of blue (B) is displayed in time series, and a rotary color filter has R, R,
G and B color lights are selectively separated and supplied in chronological order, and the light blocking means is selectively formed only in at least one of the R, G and B color filter portions to reduce the amount of light passing through the specific color light. It is better to reduce the white balance of the color image.

In order to further solve the above problems, the display device according to the present invention comprises a light receiving type color display element for displaying at least two or more original images in time series, and illumination light supplied to the color display element. And a rotary color filter that is inserted into the optical path between the light source and the color display element to make the color of the illumination light correspond to the color of the original image formed on the color display element. Has a rotating support, two or more color filters arranged around the rotating support, and light blocking means for blocking a part of light passing through the color filter, and the light blocking means passes through the color filter. It is configured to selectively act on at least a part of the light, and is configured to be attachable to and detachable from the rotary color filter, and adjusts the color tone of the color image presented by the color display element. is there.

The color display elements include red (R), green (G),
An original image of three primary colors of blue (B) is displayed in time series, and a rotary color filter has R, R,
G and B color lights are selectively separated and supplied in chronological order, and the light blocking means is selectively added only to at least one of the R, G and B color filter units to reduce the amount of light passing through the specific color light. It is better to reduce the white balance of the color image.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotary color filter using the light control means of the present invention and a display device using the rotary color filter according to the present invention will be described in detail with reference to FIGS. The form is described.

(Embodiment 1 of Rotary Color Filter) FIG.
Shows an example of the configuration of the rotary color filter of the present invention to be implemented. The rotary color filter 10 includes a rotary support 11, a cover 11B of the rotary support, a red (R) transmission color filter 12 divided into three parts, and a green (G) transmission color filter. 13, a transmission color filter 14 for blue (B). Each color filter is formed of an arc-shaped glass substrate, and a dichroic multilayer film is formed on the surface thereof by vacuum evaporation or sputtering. One rotation of the rotating support 11 is divided into three equal parts,
The segment angles are set to 0 degrees.

An example of the configuration of the rotary color filter 10 will be supplemented with reference to FIG. The rotating support 11 is, for example, a main base material 11A.
And the cover 11B. Main substrate 1
1A is a rotationally symmetric disk shape, and epoxy adhesives 17A, 17B and 17C are applied on the upper surface. Color filters 12, 13, and 14 are arranged and fixed on these so that their outer circumferences form a circumference. Further, a cover 11B having an adhesive applied to the back surface may be covered from above, and each color filter may be sandwiched between the main substrate 11 and the cover 11B.

A through-hole 11C is provided at the center of the rotary support 11 for attaching to the motor, and the rotary support 11 is fixed to a rotary shaft (not shown) of the motor using this hole. . With the above configuration, for example, the rotary color filter 10 of the present invention is inserted into the optical path, and the color filters 12, 13, and 14 sequentially pass through the cross section of the transmitted light, and accordingly, red, green, and blue Can be sequentially formed.

The rotary color filter according to the present invention is characterized in that, in the above-described configuration, for example, the outer shape of the cover 11B is devised. The cover 11B does not have a single outer circumferential shape as in the related art, but a part of the outer shape is intentionally made to have a larger radius, and this region acts on light passing therethrough as a light shielding plate. ing. Further, the region where the outer periphery is enlarged is made to coincide with, for example, a green color filter region in which the amount of light is desired to be reduced in each of the formed red, green and blue light beams.

FIG. 3 supplements this situation, and describes the operation and effects of the present invention. FIG. 3 is a front view of the rotary color filter 10 shown in FIG. 1 viewed from the direction of the cover 11 </ b> B. A dotted spot 19 indicates a cross-sectional spot of light passing through the rotary color filter 10.

According to the above configuration, the smaller outer peripheral portion 20A of the cover 11B is connected to the red filter 12 and the blue filter 14A.
When the outer peripheral portion 20A passes through the spot 19, the light passing through the spot 19 is not blocked,
Red and blue color lights are not particularly intentionally dimmed.
On the other hand, the larger outer peripheral portion 20B is
When the outer peripheral portion 20B passes through the spot 19, a part of the light passing through the spot 19 is blocked, and only the green color light is intentionally dimmed to reduce the light of reduced intensity. Can be formed.

If only a part of the cover 11B is selectively made to have such a light shielding structure, only a specific color light, for example, a green light amount can be easily and highly dimmed. By arbitrarily adjusting the size of the outer peripheral portion 20B, the amount of light to be reduced can be freely controlled.

The light-shielding structure of the present invention is not limited only to the case where a part of the cover 11B is extended to form a light-shielding structure as in the above configuration. A part of the outer periphery on the main substrate 11A side may be enlarged to have a light shielding structure. Alternatively, the same operation and effect as described above can be obtained by adding another light shielding member.

The light-shielding structure formed on the green color filter 13 is not limited to the above shape. A structure that shields only a part of the green color filter 13 may be used.
The spot 19 may be shielded from light.

However, in particular, the outer periphery of the light shielding structure is, for example, 20 mm.
It is convenient to make a part of the circumference having a constant radius with respect to the center of rotation as shown in B because the rate of dimming in the time direction is constant. Since the amount of light emitted after passing through the rotary color filter 10 after being dimmed does not change in the time direction, for example, when a display element used in combination is a PWM modulation that expresses a gradation during the light-on period. Can provide more accurate gradation display. (Embodiment 2 of Rotary Color Filter) FIG. 4 shows an example of another configuration of a rotary color filter to be implemented according to the present invention.
The rotary color filter 23 has a configuration in which a light-shielding member 21 that covers the outer periphery of the color filters 12, 13, and 14 is added to the color filter 10 described in the first embodiment.

The light-shielding member 21 is provided for the red and blue color filters 1.
The inner circumference 22A of the portion corresponding to 2, 14 has a sufficiently large radius with respect to the center of rotation, and does not shield the spot 19 from light at this portion. On the other hand, the inner periphery 22B of the portion corresponding to the green color filter 13 has a small radius and blocks a part of the spot 19 to reduce green color light.

Rotary color filter 2 shown in the second embodiment
3 is compared with the color filter 10 described in the first embodiment,
In general, since the spot 19 having the rotationally symmetric orientation distribution is shielded from both the inner circumference and the outer circumference, there is an advantage that unnecessary illumination unevenness is hardly formed as compared with the case where the light is shielded from one direction.

The light-shielding member 21 is configured so that one common member covers the outer periphery of the plurality of divided color filters. By doing so, there is an advantage that the wind noise generated at the cross section of the glass substrate joint of each filter can be reduced. In addition, the light-shielding member 21 is provided when the glass substrate of each color filter is broken during rotation for some reason.
There is an effect that high-speed scattering of broken glass fragments can be suppressed.

(Third Embodiment of Rotary Color Filter) FIG.
9 shows an example of still another configuration of the rotary color filter of the present invention to be implemented. The rotary color filter 25 is the same as that of the first embodiment.
In contrast to the color filter 10 described in
3 and 14 are the same, and these are similar
Of the main base material 26A and the cover 26B. In this embodiment, the color filters 12, 13, and 14 are respectively adhered and fixed to the main base material 16A.
B is fixed with three screws 27A, 27B and 27C. As a result, the cover 26B is attached to the rotary color filter 2
5 is detachable.

When the cover 26B can be removed as described above, if several kinds of covers having different sizes of the light shielding area, that is, different rates of light reduction, are prepared in advance,
The intensity of the specific color light can be reduced to several levels only by replacing the cover 26B. The rotary color filter according to the third embodiment can further obtain the following operation and effect.

In general, lamps used in combination with the rotary color filter of the present invention and other optical components used in the optical path of the illumination system have relatively large variations in emission spectrum and spectral transmittance characteristics. When a rotary color filter is used in combination with such components, it is difficult to weaken the intensity of specific color light and arbitrarily adjust the color tone of output light, for example, white balance. On the other hand, the rotary color filter of the present invention can solve the above-mentioned problem by providing the detachable cover 26B and the light-shielding portion that can be freely designed, and can easily obtain the output light of the optimum color tone.

(Embodiment 4 of Rotary Color Filter) FIG.
9 shows an example of still another configuration of the rotary color filter of the present invention to be implemented. The rotary color filter 30 is an example of a configuration in which a light shielding member 32 is slidably provided with respect to a rotating support 31 so that the light shielding amount of the spot 19 can be freely adjusted. With this configuration, it is not necessary to replace the cover, and the amount of light shielding can be continuously adjusted, so that a more preferable effect is obtained.

(Fifth Embodiment of Rotary Color Filter) The rotary color filters of the above-described configurations are different from completely rotationally symmetric shapes due to the addition of a light-shielding structure. Due to this, when rotating at high speed, problems may occur such as poor balance, increased load on the motor, blurred rotation, and large noise and vibration. However, the above problem is not essential because the problem can be solved by adding a load for balancing on the side 180 degrees opposite to the place where the light shielding structure is added.

FIG. 7 shows an example of a configuration in which rotation balance is taken into account in the rotary color filter of the present invention, and is a more preferable example.

In FIG. 7, the rotary color filter 35 is
One rotation is divided into six equal parts, and two red filters 36, 37,
Two green filters 38, 39, two blue filters 40,
41 are arranged alternately with each other. In such a case, as means for selectively dimming only green color light,
As in the above-described embodiment, the cover 42B of the portion corresponding to the green color filters 38 and 39 provided on the rotary support 42
May be extended to provide a light shielding structure.

According to the above configuration, the two light-shielding structures can be configured to face each other by 180 degrees, so that a reduction in rotational balance due to this can be corrected, and a more preferable rotary color filter can be configured.

(Other Embodiments of Rotary Color Filter) In the rotary color filters of the present invention described in the first to fifth embodiments, a part of the rotary support member is extended or the light-shielding structure is provided. Is added to a part of the transmitted light, the transmitted light amount of a specific color light at a specific time can be arbitrarily weakened in the transmitted light that is rotated and switched at a high speed. Thus, there is an advantage that the color tone of the entire amount of light passing through the rotary color filter can be arbitrarily adjusted according to its use, purpose, and variations in lamps and other optical components.

If a rotary color filter having a light-shielding structure is configured based on the above viewpoint, the operation and effect of the present invention are not limited to the configurations described in the above embodiments. In all the embodiments, the light-shielding structure corresponding to the green filter region has a one-to-one correspondence. However, the light-shielding structure that acts on only one part of the green filter portion or the structure that acts on other colors may be used. Is also good.

The specific shape of the light shielding structure and the configuration of the rotary color filter may be other configurations. For example, FIG. 8 shows an example of still another preferred configuration of the rotary color filter of the present invention. This is because the light shielding structures 45A, 45A
B is provided on the clamper 47 when the rotary color filter 46 is fixed to the motor 48. The clamper 47 is combined with the rotary color filter 46 configured in the same manner as in the related art to provide the same Action and effect can be obtained.

The light shielding structure may be a light shielding thin film provided directly on the color filter. For example, a light-shielding thin film can be formed by overlaying a mask having an appropriate opening on the color filter and spraying a spray paint from above. In this case, when a black paint is used, the black paint absorbs the light of the spot 19 and raises the temperature of the color filter. Therefore, it is preferable to use a light-reflective paint as the light-shielding thin film.

(Embodiment 1 of Display Device) FIG. 9 shows an example of a configuration to be implemented of a display device of the present invention. The display device includes a light source 51 that mainly emits white light, a condensing optical system 52 that condenses the light emitted by the light source 51 and converges it into a spot, and a rotary color filter 1 that is the same as that shown in FIG.
0, a motor 53 that is directly connected to the rotary color filter 10 and drives the rotary color filter 10 to rotate at a high speed; an illumination optical system 54 that collects light emitted from the rotary color filter 10 again to form illumination light; A color sequential display element 55 illuminated by the display device 55, a synchronization signal is obtained from a video signal supplied to the display element 55, and the motor 53
Drive circuit 56 for rotating rotary color filter 10 by means of
Consists of

As the light source 51, for example, a luminous body of a metal halide lamp or an ultra-high pressure mercury lamp may be used. Condensing optical system 5
2 may be configured by combining, for example, an elliptical mirror as shown, or another concave mirror with a condensing lens. The illumination optical system 54 may use a condensing lens, an integrator element using a lens array, or the like. The illumination optical system 54 condenses the light passing through the rotary color filter 10 with high efficiency, and does not cause uneven brightness or color as much as possible. The display element 55 may be illuminated as described above.

The display element 55 spatially modulates illumination light to form an optical image, and FIG. 9 assumes a transmissive liquid crystal panel. The display element 55 is a black-and-white display element, and displays a black-and-white original image corresponding to red, green, and blue at a high speed according to a full-color video signal supplied from the outside. The drive circuit 56 receives the synchronization signal distributed from the video signal, controls the drive of the motor 53 optimally, and
While the original image corresponding to red is displayed above, the illumination light (red) that has passed through the red color filter illuminates the display element 55. The same applies to the relationship between the green and blue original images and the color light of the illumination light.

With the above configuration, the observer can display the display element 55
When the transmitted light is observed, a full-color image is formed on the display element 55 and can be visually recognized.

The display element 55 of the color sequential system preferably generates an original image of three primary colors at a speed of 60 frames / sec or more of a general video signal, and preferably uses a display element having a high response speed. . For example, a transmission type panel using ferroelectric liquid crystal is known as such a liquid crystal display element. The ferroelectric liquid crystal is capable of transmitting or blocking light, that is, so-called On / Off binary display is possible. For example, this binary display is repeated 255 times for an 8-bit input video signal level, or On. By controlling the light emitting period by controlling the number of times, gradation expression can be realized. Such a display method is known as a PWM (pulse width modulation) method.

Conventionally, it is difficult to adjust the color tone of an image to be displayed with a high degree of freedom in the display device having the above-described structure. There is a problem that the image is greenish and the impression of the image is bad.

On the other hand, for example, if the modulation level corresponding to the green image of the display element 55 is lowered to form an image relatively darker than the original red and blue images, the color tone of the displayed image may be changed. Can be. However, a general display element for this purpose has a low dynamic range, and if the green modulation level at the time of full white is reduced, the resolution display capability of gradation becomes insufficient and the image quality is deteriorated.

A dichroic filter that relatively transmits only the green component is also known. However, a general interference type filter has a large ripple in a transmission spectrum, a large variation in transmittance characteristics, and a cutoff wavelength. There are issues such as large variations and it is difficult to selectively reduce only the green component.Therefore, it is necessary to reduce the amount of green light with high accuracy, and to select only the amount of green light without affecting the amount of red and blue light. Difficult to reduce.

In order to solve the above-mentioned problem, the rotary color filter 10 provided in the display device of the present invention has a cover 11B.
Has a light-shielding structure, so that only the amount of green light can be selectively adjusted with a high degree of freedom without affecting the amounts of red and blue light. Since the white balance and the color tone of the image presented by the display device can be changed, and an image having a favorable impression can be provided, an extremely large effect can be obtained.

(Embodiment 2 of Display Device) FIG. 10 shows an example of another configuration to be implemented of the display device of the present invention. This is a configuration in which a projection lens 57 is added to the display device shown in FIG.
A is enlarged and projected on a screen (not shown).

The functions and effects of the present invention are the same whether the display device is a direct-view display device or a projection display device.
As in the first embodiment of the display device, the white balance and the color tone of the projected image can be freely adjusted.

(Other Embodiments of Display Apparatus) The display apparatus of the color sequential display system described with reference to FIGS. 9 and 10 has all of the preferred embodiments described as the rotary color filters of the present invention. Can be used. Therefore,
In any case, the same operation and effect as described above can be obtained.

The color sequential display element is not limited to the transmission type ferroelectric liquid crystal panel as described in the above embodiment. As long as it is a spatial light modulator capable of switching the primary image of the three primary colors at high speed, the same configuration and the same operation and effect as described above are obtained regardless of the type other than the liquid crystal, the transmission type or the reflection type. be able to.

[0075]

As described above, the light control means of the present invention is
In a color sequential illumination system that forms different color lights in time series, the intensity of only specific color lights can be arbitrarily adjusted with a high degree of freedom. Therefore, since the color tone of the output light can be adjusted, an extremely large effect is obtained.

Similarly, the rotary color filter using the light control means of the present invention has an advantage that the color tone of the color sequential illumination light formed by using the color filter can be adjusted by the above-described operation and effect.

Similarly, the color-sequential display device using the light control means of the present invention can adjust the color tone of the displayed image with high degree of freedom and without any adverse effect by the above operation and effect. it can.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a rotary color filter of the present invention.

FIG. 2 is a configuration diagram showing an example of a configuration of a rotary color filter of the present invention.

FIG. 3 is a front view showing another embodiment of the rotary color filter of the present invention.

FIG. 4 is a front view showing still another embodiment of the rotary color filter of the present invention.

FIG. 5 is a front view showing still another embodiment of the rotary color filter of the present invention.

FIG. 6 is a front view showing still another embodiment of the rotary color filter of the present invention.

FIG. 7 is a perspective view showing still another embodiment of the rotary color filter of the present invention.

FIG. 8 is a configuration diagram showing still another embodiment of the rotary color filter of the present invention.

FIG. 9 is a configuration diagram showing one embodiment of a display device of the present invention.

FIG. 10 is a configuration diagram showing another embodiment of the display device of the present invention.

11A is a front view illustrating an example of a conventional rotary color filter. FIG. 11B is a side view illustrating an example of a conventional rotary color filter.

FIG. 12 is a configuration diagram illustrating an example of a conventional display device.

[Explanation of symbols]

10, 23, 25, 30, 35, 46 Rotary color filter 11, 26, 42 Rotary support 11A, 26A Rotary support base 11B, 26B, 31, 42B Rotary support cover 12, 36, 37 Red Transmission filters 13, 38, 39 Green transmission filters 14, 40, 41 Blue transmission filters 21, 32 Light shielding members 47 Clampers 48, 53 Motor 51 Light source 52 Condensing optical system 54 Illumination optical system 55 Display element 56 Motor drive circuit 57 Projection lens

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuki Tanabe 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. 72) Inventor Koichi Sakaguchi 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (13)

[Claims] 1. A color sequential illumination system that emits light of at least two colors that changes in time series, a light source that emits light containing two or more colors of light, and a light source that emits light in the time axis direction. Means for forming a specific color light that changes, light-shielding means inserted into an optical path to adjust the intensity of passing light, and means for selectively inserting the light-shielding means only for a necessary short time, the light-shielding means Is the light emitted by the light source,
A dimming unit that acts on only specific color light to reduce the intensity of the light and adjust the color tone of the output illumination light. 2. A rotary color filter which is mainly inserted in an optical path of white light and rotates to form different color lights in time series, wherein said rotary color filter comprises a rotary support, and said rotary support. A color filter having two or more colors arranged around the light source, and light shielding means for shielding a part of light passing through the color filter, wherein the light shielding means controls at least a part of the color light passing through the color filter. A rotary color filter configured to selectively act only and adjust the color tone of output light. 3. A rotary color filter for selectively separating three primary color lights of red (R), green (G) and blue (B), wherein the light-shielding means is at least one of R, G and B. A color filter that is selectively formed in one color filter unit to reduce a passing light amount of a specific color light, and adjusts a color tone when the R, G, and B color lights output in time series are combined. 3. The rotary color filter according to claim 2, wherein: 4. The rotary color filter according to claim 2, wherein the light blocking means blocks a fixed percentage of passing light along a rotating circumferential direction of the rotary color filter. 5. A light-shielding means is required for a cross-sectional spot of light passing through the rotary color filter, in both the inner circumferential direction and the outer circumferential direction along the circumferential direction in which the rotary color filter rotates. 3. The rotary color filter according to claim 2, wherein the rotary color filter blocks a large amount of light. 6. A rotary color filter which is mainly inserted in an optical path of white light and rotates to form different color light in time series, wherein said rotary color filter comprises a rotary support, and said rotary support. And two or more color filters arranged around the color filter, and light shielding means for shielding a part of light passing through the color filter, wherein the light shielding means is selectively applied only to at least a part of the color light of the color filter. And a color filter that can be attached to and separated from the rotary color filter, and adjusts the color tone of output light. 7. A rotary color filter for selectively separating three primary color lights of red (R), green (G) and blue (B), wherein the light-shielding means is at least one of R, G and B. A color filter that is selectively added to one color filter unit to reduce a passing light amount of a specific color light, and adjusts a color tone when the R, G, and B color lights output in time series are combined. The rotary color filter according to claim 6. 8. The rotary color filter according to claim 6, wherein the light-shielding means shields a certain percentage of passing light along a circumferential direction in which the rotary color filter rotates. 9. A light-shielding means is required for a cross-sectional spot of light passing through the rotary color filter, in both the inner circumferential direction and the outer circumferential direction along the circumferential direction in which the rotary color filter rotates. The rotary color filter according to claim 6, wherein the rotary color filter blocks a large amount of light. 10. A light receiving type color display element for displaying an original image of at least two or more colors in a time series, a light source for forming illumination light supplied to the color display element, the light source and the color display element A rotary color filter that is inserted into the optical path between and matches the color of the illumination light to the color of the original image formed on the color display element, the rotary color filter comprising: a rotary support; A color filter having two or more colors arranged around the rotary support, and light shielding means for shielding a part of light passing through the color filter, wherein the light shielding means is at least a part passing through the color filter. A display device configured to selectively act only on the light of the color display device and adjusting a color tone of a color image presented by the color display element. 11. A color display element displays an original image of three primary colors of red (R), green (G), and blue (B) in time series, and a rotary color filter applies a color image to the original image of the color display element. The corresponding R, G, and B color lights are selectively separated and supplied in time series, and the light blocking means is selectively formed only in at least one of the R, G, and B color filter units to provide a specific light. The display device according to claim 10, wherein the amount of transmitted color light is reduced to adjust the white balance of the color image. 12. A light-receiving type color display element for displaying an original image of at least two colors in a time series, a light source for forming illumination light supplied to the color display element, the light source and the color display element A rotating color filter that is inserted into the optical path between and matches the color of the illumination light to the color of the original image formed on the color display element, wherein the rotating color filter includes a rotating support, It has two or more color filters arranged around the support, and light shielding means for shielding a part of light passing through the color filter, wherein the light shielding means is at least a part of light passing through the color filter. And selectively attaches to and separates from the rotary color filter, and adjusts the color tone of the color image presented by the color display element. table Apparatus. 13. A color display element displays an original image of three primary colors of red (R), green (G), and blue (B) in a time-series manner, and a rotary color filter applies an original image of the color display element to the original image. The corresponding R, G, and B color lights are selectively separated and supplied in time series, and the light blocking means is selectively added to at least one of the R, G, and B color filter units to provide a specific light. 13. The display device according to claim 12, wherein the amount of transmitted color light is reduced to adjust white balance of a color image.