JPH11249065A - Color image forming method and device and projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a problem such as a false contour or color slurring in the case of forming a moving picture by supplying 1st color light to one of a liquid crystal panel in all the period when a color image is formed and supplying 2nd color light and 3rd color light to the other liquid crystal panel in time division. SOLUTION: This color image forming device 40 is provided with a color light supply means 41 supplying blue light, green light and red light as the 1st, the 2nd and the 3rd color light and an image forming means 42 forming an image corresponding to the supplied color light based on image information. The image information of the blue light is constantly supplied to a liquid crystal panel 9, the image information of the green light and the image information of the red light are supplied to a liquid crystal panel 10 time-sequentially and, then, the liquid crystal panels 9 and 10 modulate the light based on the image information. These image information are supplied in synchronization with the supplies of the blue light, the green light and the red light. Therefore, a composit image is formed by once rotating color filters 1 and 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color image forming method and a color image forming apparatus for forming one color image by forming a plurality of different color light images in a time-division manner. In particular, the present invention relates to a projection display device that projects a color image based on blue light, green light, and red light on a screen.

[0002]

2. Description of the Related Art In recent years, a projection type display device used as a liquid crystal panel light modulator has been known, and most of them use three liquid crystal panels. In such a projection display device, light emitted from a light source is separated into red light, green light, and blue light by a dichroic mirror, and each of these color lights is modulated by three liquid crystal panels. An image is formed by combining with a combining prism. In the case where portability is important, such as a head-mounted display device, a red filter, a green filter, and a blue filter are arranged in a well-balanced manner corresponding to each pixel of the liquid crystal panel, and light transmitted through these filters is transmitted. Is modulated by each pixel to form one color composite image.

Further, instead of the above-mentioned liquid crystal panel,
Digital Light Mirroring (DMD) is used as a reflection type image forming panel, and Digital Light Processing proposed by Texas Instruments.
A projection display device to which the (DLP) technology is applied has also been proposed. This projection display device is obtained by replacing the above-mentioned liquid crystal panel with a digital micromirror device, and the method of forming a color composite image is basically the same as that of the above-described projection display device using a liquid crystal panel. is there. Also,
A projection display device using one digital micromirror device has also been proposed. Such a projection display device includes a rotating plate type color filter on which a red filter, a green filter, and a blue filter are formed. These filters form three color lights, and each color light is formed by a digital micromirror device. By performing image processing in synchronization with the supplied timing, a red image,
A green image and a blue image are formed.

[0004]

A projection display device is a very convenient tool for displaying data and images on a large screen in presentations such as conferences and lectures.
However, in the above-described projection display device, three liquid crystal panels are used, and the use of three liquid crystal panels complicates an optical system and a circuit system.
It has become very expensive. Further, in the head mounted display device, an image is formed by one liquid crystal panel having a color filter, but one picture element is formed by combining three pixels having a color filter for supplying different color lights. , The resolution is reduced.

Furthermore, a projection display device using three digital micromirror devices (DMDs) instead of a liquid crystal panel is several times more expensive than a projection display device using three liquid crystal panels. I have. In addition, since a projection display device using one digital micromirror device can achieve a reduction in price to some extent, application to a television can be sufficiently considered. However, at present, problems such as false contours and color misregistration in forming moving images have not been solved because the configuration of the rotary plate type color filter is insufficient.

[0006] An object of the present invention is to solve such problems of the prior art.

[0007]

SUMMARY OF THE INVENTION The inventor of the present invention has studied the physiological problems of the eyes and brain, extracted the requirements that a color image forming apparatus used in a projection display device and the like should have, and extracted the requirements of the present invention. It was completed.

FIG. 10 shows a human retinal structure. There are two types of photoreceptors on the human retina: cone cells that distinguish colors and shapes, and rod cells that respond sensitively to brightness. These cells reach ganglion cells via several routes, eventually converge as optic nerve fibers to the optic papilla, and exit the eyeball as the optic nerve. During this process, the optic nerve fibers are divided into three fiber groups of different thickness. The thickest nerve fiber group has the fastest response to light stimulation, the thinnest nerve fiber group has the slowest response time to light stimulation, and the middle nerve fiber group has the fastest response to light stimulation. The response speed is intermediate between that of the thin fiber group.

Further, regarding these nerve fiber groups, for example, regarding the three primary colors, the thickest nerve fiber group transmits red, the thinnest nerve fiber group transmits blue, and the medium nerve fiber group transmits green information (H .-T.Change: J.Neurophysiol., 19,224-231,195
3, K. Motokawa: J. Neurophysiol., 12, 249-303, 194
9).

From the above, it can be understood that the color information is a mechanism that is transmitted to the visual center of the cerebrum in the order of red, green, and blue in order of time.

The present invention has been made based on the above principle. That is, the color image forming apparatus of the present invention has a first
A color image forming apparatus for supplying a color light, a second color light, and a third color light to a light modulation unit, and supplying image information corresponding to each of the color lights to the light modulation unit to form a color image. Supplying the first color light to the front light modulating unit during the entire period of forming the color image, and supplying the second color light and the third color light to the light modulating unit in a time division manner. A color light supply unit that supplies image information corresponding to the second color light to the light modulation unit in synchronization with the supply of the second color light, and outputs image information corresponding to the third color light to the third color light; And an image forming unit for supplying the light modulation unit in synchronization with the supply of the color light. At this time, the first color light is blue light, the second color light and the third color light are green light and red light, respectively, and the color light supply means emits the second color light and the third color light in this order. It may be supplied to the modulation means. A liquid crystal panel is a specific example of the light modulation unit.

In the color image forming apparatus of the present invention, in view of the physiological mechanism of performing image synthesis processing in the order of a red image, a green image, and a blue image in order of time on a higher cerebral level of an observer himself, The information of the blue image which is the slowest in the conduction speed to the cerebrum is processed constantly, and the information of the blue image which is image-processed is constantly generated. The information of the blue image that is constantly generated and the information that is generated in the order of the green image and the red image in a time sequential manner are generated in parallel in Thus, three-color images forming one combined image are combined in the cerebrum as simultaneously as possible. Therefore, false contours, color shifts, and the like can be reduced, a clear image can be obtained, and discomfort and eye strain can be reduced.

When the first color light, the second color light, and the third color light are lights other than blue, green, and red, respectively, for example, cyan light, magenta light, and yellow light, conduction to the cerebrum is performed. Light that contains a lot of slow-colored light components is constantly generated, and light that contains a lot of color component light with a medium conduction speed to the cerebrum and light that contains a lot of the fastest color components are time-divided in this order. The same effect as described above can be obtained if it is generated in a targeted manner.

Further, the color light supply means includes the first color light,
A light source that emits light containing the second color light and the third color light; a color separation unit that separates the light emitted from the light source in two directions; A color light generation unit that generates a second color light and a third color light from one of the lights in a time-division manner; the first color light modulated by the light modulation unit; the second color light or the second color light; And light combining means for combining the three color lights.

As a specific example of the light source, a halogen lamp,
Mainly use metal halide lamps, mercury lamps, etc.

Specifically, a dichroic prism or a cross dichroic prism can be used as the light combining means.

Specifically, a polarizing beam splitter or a dichroic mirror can be used as the light separating means.

As the color light generating means, a rotary color filter in which a first filter unit for generating a second color light and a second filter unit for generating a third color light are alternately used. Can be. In the case where a dichroic mirror is used as the light separating means, the light emitted from the light source can be separated into the first color light, the second color light, and the combined light of the third color light. It is sufficient to use a rotating color filter. However, in the case of using a polarizing beam splitter as the light separating means, it is necessary to separately arrange a color filter having a filter unit that generates the first color light in addition to the rotating color filter. There is.

In the above configuration, the light emitted from the light source is separated in two directions by the light separating means. For example,
When a dichroic mirror is used as the light separating means, the light is separated into the first color light and the combined light of the second color light and the third color light. The first color light is directly incident on the light modulating means, is modulated, and is incident on the light synthesizing means. Further, the second color light and the third color light are generated in a time-division manner by the rotating color filter and sequentially enter the light combining means. The first color light and the second or third color light incident on the light combining means are combined to form one color image. That is, it is possible to constantly supply the first color light and the second and third color lights to the light modulating means in a time sequential manner. In the case where a polarization beam splitter is used as the light separating means, the first color light is provided on the optical path of the light not passing through the rotating color filter among the lights separated in two directions and before the light modulating means. Has to be provided as described above.

It is preferable to provide a light absorbing section between the second filter section and the third filter section.

This light absorbing portion has a light-shielding effect, and can erase an afterimage of the second color light image or the third color light image formed before the light-shielding period, so that a clearer image can be obtained. Become. When a color filter that generates the first color light is used, the color filter is a rotating color filter that includes a filter unit that generates the first color light and a light absorbing unit, and the second and third color lights are used. It is preferable to rotate the rotating color filter so that the period in which the first color light is shielded matches the period in which the first color light is shielded.

It is to be noted that the same effect can be obtained by controlling the lighting of the light source without providing a light shielding portion in the rotating color filter.

The color light supply means includes a light source for emitting a first color light, a light source for emitting a second color light, and a light source for emitting a third color light, and the light source for emitting the second color light and the light source for emitting the second color light. If the light source lighting control means for alternately lighting the light source that emits the third color light is provided, the light generating means, that is, the color filter becomes unnecessary.

As the light source that emits the first, second and third color lights, for example, LEDs that emit blue, green and red light can be used.

In this case, by constantly turning on the light source that emits the first color light, the first color light is constantly supplied, and the light source that emits the second and third color lights is constantly turned on. By turning on the lights sequentially, the second and third lights are sequentially turned on.
Are supplied in this order.

The light source lighting control means includes a period for turning off both light sources between a period when the light source emitting the second color light is on and a period when the light source emitting the third color light is on. Is provided, the above-described light-shielding effect is obtained. It is more effective to turn off the light source that emits the first color light when the light sources that emit the second and third color lights are turned off.

According to the color image forming method of the present invention, the first color light, the second color light, and the third color light are supplied to the light modulating means, and image information corresponding to the respective color lights is supplied to the light modulating means. A color image forming method for forming a color image by supplying the first color light to the light changing means during the entire period of forming the color image, wherein the second color light and the second And the second color light is supplied to the light modulating means in a time-division manner.
The image information corresponding to the third color light is supplied to the light modulation unit in synchronization with the supply of the second color light, and the image information corresponding to the third color light is synchronized with the supply of the third color light. It is characterized in that it is supplied to a light modulating means.

Further, the first color light is blue light, the second color light and the third color light are green light and red light, respectively, and the second color light and the third color light are The light is supplied to the light modulating means in this order.

Further, a light-shielding period is provided between a period in which the second color light is supplied to the light modulation means and a period in which the third color light is supplied to the light modulation means. I do.

According to the projection type display device of the present invention, the first color light,
A second color light and a third color light are supplied to light modulating means, and image information corresponding to each color light is supplied to the light modulating means to form a color image, and the color image is projected on a screen. A type display device, wherein the first color light is supplied to the light changing means during the entire period of forming the color image, and the second color light and the third color light are time-divisionally A color light supply unit for supplying light to the light modulation unit, and an image information corresponding to the second color light is supplied to the light modulation unit in synchronization with the supply of the second color light, and an image corresponding to the third color light is provided. Image forming means for supplying information to the light modulation means in synchronization with the supply of the third color light.

The projection display apparatus of the present invention can enjoy the effects of the above-described color image forming apparatuses. Further, it is possible to form an image with two liquid crystal panels, a digital mirror device, and the like. Since the optical system and the circuit system are simplified, miniaturization and portability can be improved. Further, the manufacturing cost can be reduced.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 is a schematic view showing a first embodiment of a color image forming apparatus and a projection display apparatus of the present invention.

The projection display device 50 includes a color image forming apparatus 40 and a projection lens 30 as a projection unit that projects light emitted from the color image forming apparatus 40.

The color image forming apparatus 40 includes first, second,
A color light supply unit 41 that supplies blue light, green light, and red light as third color light, and an image forming unit 42 that forms an image corresponding to the color light supplied from the color light supply unit 41 based on image information. have.

The color light supply means 41 includes a light source 3, a polarization beam splitter 4 as a light separation means for splitting light emitted from the light source 3 in two directions, and a color filter 1 for constantly generating blue light. And a rotating plate type color filter 2 as color light generating means for generating green light and red light in time sequence, and a lens 5 for condensing each parallel light emitted from the light source 3 and separated in two directions. , 6 and lenses 7, 8 for converting the light passing through the color filters 1, 2 into substantially parallel light.
And The image forming unit 42 includes liquid crystal panels 9 and 10 as light modulating units, and the dichroic mirror 11 that reflects blue light as a light synthesizing unit that recombines light. In addition, 12 and 13 are total reflection mirrors. The color beam generated by the polarization beam splitter 4 of the color supply unit 41 from the light that has been polarization-divided into two pieces, either permanently or time-sequentially, is only a predetermined polarization light. , 10. The liquid crystal panels 9 and 10 are transmissive liquid crystal panels that modulate incident light and emit the modulated light as transmitted light. The light transmitted by the liquid crystal panels 9 and 10 is reflected by a dichroic prism 11 as a light combining means arranged in the optical path of the transmitted light, and is enlarged and projected by a projection lens 30.

Here, as shown in FIG. 2 (a), the color filter 1 is a fixed plate type color filter having a blue filter B for generating blue light constantly. As shown in FIG. 2B, a green filter G for generating green light as a first filter section and a red filter R for generating red light as a second filter section, in time sequence. And a rotary plate type color filter comprising: Then, these filters split the light from the light source into two parts by a polarizing beam splitter.
One of the two polarized light components is constantly generated as blue light only by the blue filter B of the color filter 1. On the other hand, the other polarized light split into two light beams passes through the green filter G and the red filter R of the rotating plate type color filter 2 in this order, so that the green light and the red light are temporally sequentially converted into green light and red light. They will be supplied in order. Then, blue light image information is constantly supplied to the liquid crystal panel 9 from an image information supply unit (not shown).
Similarly, green light image information and red light image information are supplied to the liquid crystal panel 10 from an image information supply means (not shown) in time sequence. The liquid crystal panels 9 and 10 emit light based on these image information. Modulation. These image information
It is supplied in synchronization with the supply of blue light, green light, and blue light. Accordingly, one color composite image is formed by one rotation (counterclockwise as viewed from the light source side) of the fixed color filter 1 in which the blue filter B and the rotary color filter 2 composed of the green filter G and the red filter R are arranged. Constituting blue, green, and red images can be formed.

In the color image forming apparatus 30 and the projection type display apparatus 40 of the present embodiment, the image synthesis processing is sequentially performed in the order of the red image, the green image, and the blue image at the observer's own higher cerebrum level. In view of the physiological mechanism that is performed, the conduction speed to the cerebrum is constantly generated, the information of the blue image which is the slowest image synthesis processing is performed, and the conduction speed to the cerebrum is the red which is the fastest image synthesis processing Image and 2
The information of the green image which is generated first and the information of the blue image which is generated constantly and the information which is generated in the order of the green image and the red image which are generated in a time sequential manner in the reverse order. Are generated in parallel, so that the three color images forming one composite image are combined in the cerebrum as simultaneously as possible. Therefore, false contours, color shifts, and the like can be reduced, a clear image can be obtained, and discomfort and eye strain can be reduced.

(Modification of Color Filter 2) In the above-described combination of the fixed plate type color filter 1 and the rotary plate type color filter 2, the color light for forming one composite image by one rotation of the rotary plate type color filter 2 is supplied. The configuration of the color filter may be replaced with the configuration of a color filter that supplies color light for forming a plurality of composite images in one rotation.

FIG. 3 is a diagram showing an example in which a fixed plate type color filter 1 and a rotating plate type color filter 20 for supplying color light for forming two composite images in one rotation are configured.

The fixed plate color filter 1 shown in FIG. 3A is a blue filter B, and the rotary plate filter 20 shown in FIG. 3B is a green filter G and a second filter as a first filter unit. Two red filters R are provided as filter units. In addition, these filters are configured such that one of the lights split into two by the polarization beam splitter 4 constantly passes through a blue filter B, and the other light split into two lights is green. The filter G and the red filter R are arranged so as to pass in this order. Therefore, blue light is constantly supplied from the color light supply means, and green light and red light are supplied in this order in time sequence. Liquid crystal panels 9 and 1 as light modulating means
0, as in the previously described embodiment,
By supplying the blue light image information and the green light image information and the red light image information in time sequence, one rotation of the fixed plate type color filter 1 and the rotating plate type color filter 20 (counterclockwise as viewed from the light source side) In this case, the blue image forming the two color composite images can be constantly formed, the green image and the red image can be sequentially formed in this order.

As described above, the number of sets of color lights (sets of blue light, green light, and red light) that can be supplied per one rotation due to the configuration of the fixed plate type color filter and the rotating plate type color filter is determined by the number of color filters. It can be set arbitrarily by changing the number of combinations.

(Second Embodiment) FIG. 4 is a schematic view showing a color image forming apparatus and a projection display apparatus according to a second embodiment of the present invention. The present embodiment is characterized in that a liquid crystal panel as a light modulating means is a reflection type liquid crystal panel which emits modulated light as reflected light, and reflects (transmits) light transmitted through a color filter, and a reflection type liquid crystal panel. Instead of the reflection mirror 13 (see FIG. 1) for transmitting (reflecting) the modulated reflected light, two polarization beam splitters are used as light combining means. A blue image and a green image from the two polarization beam splitters Instead of a dichroic prism (see FIG. 1) that reflects each information of the red image,
It differs from the first embodiment only in that a cross dichroic prism is used. The other points are the same as those in the first embodiment, and thus the detailed description is omitted. Note that the same components as those in the first embodiment described above are denoted by the same reference numerals as those used in FIG.

The projection display device 50 includes a color image forming apparatus 40 and a projection lens 30 as a projection unit for projecting light emitted from the color image forming apparatus 40.

The color image forming apparatus 40 includes a color light supply means 41 for supplying blue light, green light and red light, and an image forming apparatus for forming an image corresponding to the color light supplied from the color light supply means 41 based on image information. Means 43.

The color light supply means 41 has exactly the same configuration as the color light supply means 31 according to the first embodiment, and includes a light source 3 and a polarization beam splitter 4 for splitting the light emitted from the light source 3 into two. , Condenser lenses 5 and 7 for condensing the polarized light divided into two parts, respectively.
And a fixed plate type color filter 1 for constantly generating each of the polarized lights condensed by the condenser lens to generate blue light, and a rotating plate type color filter for sequentially and sequentially generating green light and red light. A filter 2 is provided, and the color filters 1 and collimating lenses 6 and 8 for making the respective polarized color lights transmitted through the color filter 2 substantially parallel. The image forming means 43 includes liquid crystal panels 14 and 15, a polarizing beam splitter 16 for transmitting polarized color light from the color filter 1 and reflecting polarized light having color information from the liquid crystal panel 14, and a color filter 2. And a cross dichroic prism 18 for reflecting polarized color light from the liquid crystal panel 15 and transmitting polarized light having color information from the liquid crystal panel 15 and reflecting the color information. The blue light constantly generated from the color light supply unit 41 passes through the polarization beam splitter 16 disposed in the optical path of the transmitted light, and only predetermined polarization light is transmitted to the liquid crystal panel 1.
4 is incident. The liquid crystal panel 14 is a reflection type liquid crystal panel that modulates and polarizes incident polarized light, and emits the modulated and polarized light as reflected light.
The light reflected by the liquid crystal panel 14 is reflected by a polarization beam splitter 16 this time, and is reflected by a cross dichroic prism 18 arranged in the optical path of the reflected light.
Only the predetermined polarized light is enlarged and projected by the projection lens 20. On the other hand, the green light and the red light generated in time sequence from the color light supply unit 41 are reflected by the polarization beam splitter 17 arranged in the optical path of the reflected light, and only the predetermined blue polarized light is emitted from the liquid crystal panel 15. Incident on. LCD panel 15
Similarly modulates and polarizes incident light, modulating,
In addition, it is a reflection type liquid crystal panel that emits the polarized light as reflected light. Then, similarly, the light reflected by the liquid crystal panel 15 is transmitted to the polarization beam splitter 1 this time.
7, is reflected by the cross dichroic prism 18 disposed in the optical path of the reflected light, and only the predetermined polarized light of green and red is enlarged and projected by the projection lens 20.

(Modification 1 of Color Light Supply Means 31) The color light supply means 41 in the first and second embodiments described above uses the polarizing beam splitter to split one of the light source lights into two lights. The fixed plate type color filter constantly supplies blue light, and the other light split into two polarizations is time-sequentially processed by the rotating plate type color filter.
Green light and red light were supplied in this order,
This can be replaced by the color light supply means 44 as shown in FIG.

FIG. 5 shows a dichroic mirror 19 as light separating means for splitting a light source light into a blue light, a combined light of green light and red light, and a combined light of green light and red light.
It is a figure which shows the example which comprised the rotating plate type color filter 2 as a color light generation means which further divides color light into two.

The color light supply means 44 as shown in FIG.
The light from the light source is constantly split into two by the dichroic mirror 19 into blue light and combined light of green light and red light. The combined light of the green light and the red light, which has been divided into two color lights, is further divided into two color lights in the order of green light and red light in a time sequential manner by the rotating plate type color filter 2.
As described above, the blue light is constantly supplied from the color light supply unit, and the green light and the red light are supplied in this order in time sequence. As in the case of the above-described embodiments, the blue light image information and the green light image information and the red light image information are supplied to the liquid crystal panels 9 and 10 in a time-sequential manner. One rotation of the rotating plate type color filter 2 (counterclockwise as viewed from the light source side) converts a blue image forming one color composite image into a green image,
A red image can be formed in this order in time sequence.

As described above, with the configuration of the dichroic mirror and the rotary plate type color filter, image information can be provided in the same manner as in the first embodiment.

(Variation 2 of Color Light Supply Means 31) The color light supply means 41 in the first and second embodiments described above is one of the two light sources obtained by dividing continuous light from a continuous light source into two parts by a polarizing beam splitter. Light is supplied blue light constantly by a fixed plate type color filter, and the other light split into two polarizations is supplied by a rotating plate type color filter in the order of green light and red light in time sequence. However, this was changed to the continuous light source 3 of the color light supply unit 31 in FIG.
Can be replaced with an intermittent blinking variable light source not shown in the figure.

The light emitted from the intermittently blinking variable light source of the color supply means 41 is split into two polarizations by a polarization beam splitter. As for one of the two polarized lights, only blue light is constantly generated by the color filter 1. On the other hand, as for the other polarized light split into two, the combined light of the green light and the red light is constantly generated by the color filter 2, and thereafter, a green filter G for generating the green light in a time sequential manner. And a rotating plate type color filter 2 having a red filter R for generating red light,
Green light and red light are generated in time sequence in the order of green light and red light. In this case, by providing a light source light extinguishing period in the second half of the red light generating period and the first half of the green light generating period,
Blue light, time-sequentially, green light and red light are generated in this order, and the entire light-blocking period is generated between the period in which the red light is supplied and the period in which the green light is supplied. You. The light-off period can be set arbitrarily. On the other hand, the liquid crystal panels 9 and 10 are constantly supplied with blue light image information and time-sequentially green light image information and red light image information, as in the above-described embodiment. You just need to supply the information.
The image information supplied during the light-shielding period is arbitrary.

The same effects as those of the color image forming apparatus 40 and the projection type display apparatus 50 according to the above-described embodiment can be obtained in the color image forming apparatus and the projection type display apparatus using the intermittent blinking variable light source as in this embodiment. be able to. Further, in the color image forming apparatus and the projection display apparatus using the intermittent blinking variable light source in this example, by providing a light-shielding period, a blue image, a green image,
There is also an effect that a residual image of a red image can be eliminated and a clearer image can be obtained.

As a method of providing a light-blocking period, black image information may be added to the liquid crystal panels 9 and 10, as shown in FIG. 7, in addition to the intermittent blinking variable light source. in this case,
The color light supply means 41 is the same, but includes a liquid crystal panel 9 that supplies image information of blue light in the second half of the generation period of red light and the first half of the generation period of green light, and a green light image in time sequence. The liquid crystal panel 10 that supplies the information and the image information of the red light is simultaneously set to the black image information at the same time, so that the light is simultaneously shielded between the permanent blue light and the time-sequential red light and green light. Therefore, constantly, the blue light is time-sequentially
Green light and red light are generated in this order, and an entire light-shielding period is generated between a period in which red light is supplied and a period in which green light is supplied. On the other hand, on the liquid crystal panels 9 and 10, between the red light image information and the green light image information,
The black image information is inserted, and otherwise, as in the above-described embodiment, the blue light image information is constantly supplied, and the green light image information and the red light What is necessary is just to supply image information.

(Modification 3 of Color Light Supply Means 31) The color light supply means 41 in the above-described first and second embodiments comprises a light source, a fixed plate type color filter for constantly supplying blue light, Although a rotating plate type color filter that supplies green light and red light sequentially is used, this can be replaced with a color light supply unit 25 as shown in FIG.

The color light supply means 25 shown in FIG. 8 includes a blue light emitting diode 25B as a blue light source for supplying blue light, a green light emitting diode 26G as a green light source for supplying green light, A red light emitting diode 26R as a red light source for supplying red light is provided. Light emitting diodes 26B, 26G, 26 of each color
R is connected to electrical signals 28B, 28G, and 28 as shown in FIG. 9A via terminals 27B, 27G, and 27R, respectively.
R is supplied. The blue light emitting diode 26B is turned on only during the rising period of the electric signal 28B, the green light emitting diode 26G is turned on only during the rising period of the electric signal 28G, and the red light emitting diode 26R is turned on only during the rising period of the electric signal 28R. Therefore, the blue light emitting diode 26B is constantly connected to the green light emitting diode 26G,
The red light emitting diodes 26R are lit sequentially in this order, and the image forming means is supplied with blue light, green light and red light in this order. When such a color light supply unit 29 is used, a color image forming apparatus and a projection display apparatus employing the configuration of the color filters 1 and 2 shown in FIG. 2 or the configuration of the color filters 1 and 20 shown in FIG. Similar effects can be obtained.

Further, in order to supply the intermittent blinking variable light source shown in FIG. 6 and the light-shielding period such as the black image information shown in FIG. 7, terminals 27B, 27G and 27R are connected to the terminals 27B, 27G and 27R as shown in FIG.
The electric signals 29B, 29G, and 29R shown in FIG. The electrical signal shown in FIG. 9 (b), between the time t ₃ when turning on the period t ₁ and the green light emitting diode 26G for lighting the red light emitting diode 26R, the period t ₂ to turn off all the light emitting diodes provided ing. Therefore, the blue light is constantly supplied, the green light and the red light are supplied in this order in time sequence, and between the period in which the red light is supplied and the period in which the blue light is supplied, A light blocking period is generated. By using such a color light supply means 29, the same effects as those of the intermittent blinking variable light source shown in FIG. 6, the color image forming apparatus based on the black image information shown in FIG. 7, and the projection display device can be obtained.

In place of the light emitting diode, a fluorescent tube, a neon tube, a high-pressure mercury lamp, a plasma phosphor, electroluminescence, a laser light source, or the like may be used.

(Other Embodiments) The configuration of the projection type display device according to the above-described embodiment includes a front type projection type display device that performs projection from the side that observes the projection surface, and a side that observes the projection surface. Is applicable to any rear projection display device that performs projection from the opposite side.

Further, instead of the reflection type liquid crystal panels 14 and 15 (see FIG. 4) according to the second embodiment, a digital micromirror device (DMD) can be adopted.

[0061]

As described above, in the color image forming apparatus and the projection type display apparatus of the present invention, the red image, the green image, and the blue image are sequentially arranged in order of the observer's own higher cerebrum. In view of the physiological mechanism of image synthesis processing, the conduction speed to the cerebrum is the slowest, and the information of the blue image to be synthesized is constantly generated, and the conduction speed to the cerebrum is the fastest. The red image to be processed and the information of the second earliest green image are
By sequentially generating information of a blue image that is generated in a time sequential manner, and information of a green image and a red image that are constantly generated in a time sequential manner, 1
The three color images forming one combined image are combined by the cerebrum as simultaneously as possible. Therefore, false contours, color shifts, and the like can be reduced, a clear image can be obtained, and discomfort and eye strain can be reduced.

The image forming means is composed of two liquid crystal panels,
Since the optical system and the circuit system can be simplified by using a digital mirror device or the like, miniaturization and portability can be improved. Further, the manufacturing cost can be reduced.

[Brief description of the drawings]

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

FIG. 2 is a configuration example and a plan view of a color filter 1 and a color filter 2 in FIG.

FIG. 3 is a plan view showing a modification of FIG. 2;

FIG. 4 is a schematic view showing a second embodiment of the present invention.

FIG. 5 is a diagram showing a modification of the color light supply means 41 in FIG. 1 or FIG.

FIG. 6 is a diagram showing a modification of the color light supply unit 41 in FIG. 1 or FIG.

FIG. 7 is a diagram showing a modification of the color light supply means 41 in FIG. 1 or FIG.

FIG. 8 is a diagram showing a modification of the color light supply unit 41 in FIG. 1 or FIG.

FIG. 9 is a diagram showing electric signals supplied to the color light supply unit 25 of FIG.

FIG. 10 is a diagram illustrating a human retinal structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Color filter 1 2 Color filter 2 3 Light source 4 Polarization beam splitter 5, 6 Condenser lens 7, 8 Collimator lens 9, 10 Liquid crystal panel 11 Dichroic prism 12, 13 Total reflection mirror 14, 15 Liquid crystal panel 16, 17 Polarization beam splitter 18 Cross dichroic prism 19 Dichroic mirror 20 Color filter 25 Color light supply means 26R, 26G, 26B Light emitting diode 27R, 27G, 27B Terminal 28R, 28G, 28B, 29R, 29G, 29B
Electrical signal 30 Projection lens 40 Color image forming device 41 Color light supply means 42 Image forming means 43 Image forming means 44 Color light supply means 50 Projection display device 60 Color image formation device 70 Color image formation device 80 Color image formation device 90 Projection display apparatus

Claims (11)

[Claims] 1. A color image is formed by supplying a first color light, a second color light and a third color light to a light modulating means, and supplying image information corresponding to each of the color lights to the light modulating means. A color image forming apparatus, wherein the first image is formed during the entire period of forming the color image.
Color light supplying means for supplying the second color light and the third color light to the light modulation means in a time-division manner, and supplying color light to the light modulation means; and image information corresponding to the second color light. Is supplied to the light modulator in synchronization with the supply of the second color light, and the image information corresponding to the third color light is supplied to the light modulator in synchronization with the supply of the third color light. And a forming means. 2. The color image forming apparatus according to claim 1, wherein said first color light is blue light, and said second color light and said third color light are green light and red light, respectively. In addition, the color light supply unit supplies the second color light and the third color light to the light modulation unit in this order. 3. The color image forming apparatus according to claim 1, wherein said color light supply means emits light containing said first color light, said second color light, and said third color light. A light separating unit that separates the light emitted from the light source in two directions, a second color light and a third color light from one of the lights separated in the two directions in a time-division manner. A color light generation unit that generates the first color light modulated by the light modulation unit;
A light combining means for combining the second color light or the third color light. 4. The color image forming apparatus according to claim 3, wherein said color light generating means includes: a first filter unit that generates a second color light; and a second filter that generates a third color light. A color image forming apparatus, wherein the color image forming apparatus is a rotary color filter in which the color filters are alternately arranged. 5. The color image forming apparatus according to claim 4, wherein a light absorbing section is provided between said first filter section and said second filter section. Color image forming apparatus. 6. The color image forming apparatus according to claim 1, wherein the color light supply unit emits a first color light, a second color light, and a third color light. A color image forming apparatus comprising: a light source; and light source lighting control means for alternately turning on a light source that emits the second color light and a light source that emits the third color light. 7. A color image is supplied by supplying a first color light, a second color light and a third color light to a light modulating means, and supplying image information corresponding to each of the color lights to the light modulating means. A color image forming method for forming the color image, wherein the first image forming method comprises:
And the second color light and the third color light are supplied to the light modulation means in a time-division manner, and image information corresponding to the second color light is And supplying the image information corresponding to the third color light to the light modulation means in synchronization with the supply of the third color light. Color image forming method. 8. The color image forming method according to claim 7, wherein said first color light is blue light, and said second color light and said third color light are green light and red light, respectively. A color image forming method, wherein the second color light and the third color light are supplied to a light modulator in this order. 9. The color image forming method according to claim 7, wherein a period between the time when the second color light is supplied to the light modulating means and the time when the third color light is supplied to the light modulating means is provided. A color image forming method, wherein a light shielding period is provided. 10. The color image forming apparatus according to claim 9, wherein said light source lighting control means determines whether a light source emitting the second color light is on and a light source emitting the third color light. A color image forming apparatus, wherein a period in which both light sources are turned off is provided between a period in which the light source is turned on. 11. A color image is formed by supplying a first color light, a second color light and a third color light to a light modulating means, and supplying image information corresponding to each of the color lights to the light modulating means. A projection-type display device that projects the color image on a screen, wherein the first image display device is configured to perform the first image processing during the entire period in which the color image is formed.
Color light supply means for supplying the second color light and the third color light to the light modulation means in a time-division manner, and image information corresponding to the second color light. Is supplied to the light modulator in synchronization with the supply of the second color light, and the image information corresponding to the third color light is supplied to the light modulator in synchronization with the supply of the third color light. And a forming means.