JP2003186112A - Image projection and display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To more promote miniaturizing and lightening of an image projection and display device by reducing a light source part by providing a system for remarkably improving the light source efficiency. <P>SOLUTION: The image projection and display device is provided with light source units 101, 102 and 103 configured by making proximate a plurality of light source members having light distribution characteristics, a two-dimensional reflection cell array device 110 composed of a plurality of fine reflection cells, illumination light scanning parts 108 and 109 for scanning illumination light outputted from the light source units 101, 102 and 103 in a two-dimensional manner with a prescribed scan range and a prescribed scan frequency and irradiating the reflection plane of the two-dimensional reflection cell array device 110 therewith, an element drive control part for controlling the drive of the two-dimensional reflection cell array device 110 corresponding to the gradations of inputted image data and a projection lens 111 for projecting the illumination light from the illumination light scanning parts 108 and 109 reflected corresponding to the drive control of the two-dimensional reflection cell array device 110 on a prescribed projection plane as projection light. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image projection display device, and more particularly to an image projection display device for converting image data output from an information device or the like into visual image information and projecting and displaying it on a projection surface.

[0002]

2. Description of the Related Art Conventionally, in the case of giving a presentation, an explanation, etc. to a plurality of people, various means have been provided for enlarging an image and projecting it on a predetermined projection surface. With the recent development and popularization of personal computers and presentation creation software, an environment has been set up in which images can be converted into data and easily handled, so unlike the former slide film, it was created with a personal computer without much effort. 2. Description of the Related Art Image projection display devices (hereinafter referred to as data projectors) that can easily interface with digital information devices that directly convert and project image data as projected images have been widely used.

A projection method using a data projector such as a digital cinema has been attempted even in movie screening.
Further, at home, it is expected to use a data projector that can easily realize a powerful image on a large screen at low cost. Therefore, in addition to the demand for image quality, the market demand for miniaturization and cost reduction is rapidly increasing.

The data projector is largely of the liquid crystal type and the D type.
The LP system is becoming the mainstream. Especially Texas In
DMD is the DLP method developed by
(Digital Micromirror Device
This is a completely new reflection projection image forming method by an optical processing technology using a light modulation element called as (ce). An image is created by switching each mirror to an angle of ± 10 degrees using a device in which hundreds of thousands of 16 μm square mirrors are laid, and the reflection time is adjusted by adjusting the switching frequency of the mirror to produce gradation. Can be expressed. The advantage is that the response speed is fast, the reflection type reduces loss of light quantity, high brightness is obtained, and the image can be formed by complete digital control. Since the response speed is fast, the light from the light source can be rotated by the color filter and reflected by this device by the three-primary-color-plane-sequential illumination method to form a projected image, which is not possible with other conventional methods. Allows for light weight. In addition, a laser display, which has been applied as a data projector, has also appeared.
An image is formed by independently modulating the output of the laser beams of the three primary colors to express gradation and scanning the screen surface two-dimensionally at high speed. It is possible to screen-free by making the best use of the characteristics of laser light even on a three-dimensional projection surface, and since the wavelength band of each primary color is narrow, it is possible to express a wide range of tones. It has the feature that high image quality with unprecedented color reproducibility can be obtained. However, large-scale devices are being put to practical use for the reason that a high-power laser is necessary in order to obtain sufficient brightness of the displayed image. The issue of the effect on vision remains.

[0005]

In view of the recent development of an electronic communication environment, a display method using a data projector, which has a high affinity with various information equipments, is one of the means for a large-scale display device. It can be said that it will be used more and more widely in the future, because it is possible to easily use a large screen without installing it. In order to promote its utilization, the emergence of a data projector that is easy to use, small and lightweight, and low in cost is an important factor. In addition, it can be said that the demand for multifunctional devices that have not only the projection function but also the image input function will increase in the future.

However, although efforts have been made to reduce the size and weight of data projectors in recent years, they are highly portable, comfortable to carry, and can be easily installed without worrying about space. I haven't arrived.

The present invention has been made by paying attention to such a problem, and its object is to focus on the light source section which is an obstacle to the reduction in size and weight of the conventional apparatus, and to significantly improve the light source efficiency. It is an object of the present invention to provide a method for increasing the size and weight of a data projector device by providing a method of increasing the size of the light source unit by eliminating the mechanical cooling mechanism and the frame sequential color filter mechanism. . At the same time, it is an object of the present invention to provide a high quality image data projector which is further excellent in color tone reproduction due to the configuration of the primary color light source having a narrow wavelength region.

[0008]

In order to achieve the above object, a first invention is an image projection display device for modulating and projecting illumination light output from a light source based on image data. A light source section including a plurality of light source members having characteristics close to each other, a two-dimensional reflection cell array device including a plurality of minute reflection cells, an illumination light output from the light source section within a predetermined scanning range and a predetermined range. An illumination light scanning unit that scans two-dimensionally at a scanning frequency and irradiates the reflective surface of the two-dimensional reflective cell array device, and an element that controls driving of the two-dimensional reflective cell array device according to the gradation of input image data. Projection optics for projecting illumination light from the illumination light scanning unit, which is reflected in accordance with drive control of the two-dimensional reflection cell array device, as projection light onto a predetermined projection surface. Comprising the door.

A second invention is the image projection display apparatus according to the first invention, wherein the light source section is red, green or
It consists of three types of surface light sources: blue.

A third invention is the image projection display apparatus according to the second invention, wherein the surface light source is a high-brightness LED.
Is.

A fourth invention is the image projection display apparatus according to the second invention, wherein the surface light source is a high brightness laser light emitting element.

A fifth aspect of the invention is the image projection display apparatus according to the second aspect, wherein the surface light source synthesizes the three types of light rays and outputs the synthesized light rays.

A sixth aspect of the present invention is the image projection display apparatus according to the second aspect, wherein the surface light source corresponds to each of the red, green and blue frame data of the input image data. Switch the order of red, green, and blue emission.

A seventh aspect of the present invention is the image projection display apparatus according to the first aspect, wherein the illumination light scanning unit causes the non-uniform illumination light output from the light source unit to be the afterglow of human vision. Two-dimensional scanning is performed with a predetermined horizontal and vertical scanning period and scanning width so that the image can be perceived as uniform projection illumination light due to its characteristics.

An eighth aspect of the invention is the image projection display apparatus according to the first aspect, further comprising detection means for detecting the maximum value of the frame data of the input video data, wherein the light source section comprises: The light emission output is controlled in accordance with the detected maximum value, and the maximum value is associated with the drive control representing the maximum gradation of the two-dimensional reflective cell array device to perform the gradation control.

A ninth invention is the image projection display apparatus according to the first invention, wherein the light source section is red, green or
Three types of light source members of blue are arranged in a predetermined order in the horizontal and vertical directions.

A tenth aspect of the present invention is the image projection display apparatus according to the first aspect, wherein the projection optical section is used as an image pickup optical system, and an image of a subject corresponding to the projection surface is formed in the two-dimensional reflection cell array. An image is formed on the reflecting surface of the device, and the formed object image is arranged at a predetermined position by uniformly controlling the reflection angle of the two-dimensional reflection cell array device.
An image is formed on the three-dimensional image pickup device.

An eleventh aspect of the present invention is an image projection display device for modulating and projecting laser light source light output from a light source on the basis of image data, and a laser light source section for emitting a laser point light source, and the laser light source. A laser scanning unit for two-dimensionally scanning a point light source emitted from a unit with a predetermined scanning range and a predetermined scanning frequency, and light emission for performing light emission drive control of the laser light source unit according to the gradation of input image data. A drive control unit, a projection optical unit that projects the spot illumination light emitted by the laser scanning unit onto a predetermined projection surface, and a predetermined unit that forms an image of the spot illumination light projected on the projection surface as a subject and makes it incident. An imaging optical system arranged at a position, an imaging unit for imaging the illumination light imaged by the imaging optical system, and a spot illumination unit irradiated by the laser scanning unit. A projection plane position of the light, based on an output of the imaging unit comprises an image construction unit that constitute the captured image of the object on the projection surface.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to an image projection display device for modulating illumination light output from a light source based on image data and projecting the light source, wherein the light sources are provided with a plurality of high-brightness and small-sized light distribution characteristics. Illumination light scanning section for irradiating the reflective surface of the two-dimensional reflective cell array device by scanning the surface light source emitted from the light source section two-dimensionally with a predetermined scanning range and a predetermined scanning frequency. It is characterized by having.

That is, a small light source with high brightness is realized,
Since it is possible to obtain illumination light with extremely small unevenness in illumination, it is possible to further reduce the size and weight of the image projection display device.

Further, the image projection display device according to the present invention is
Since the light source loss is extremely small and the three primary color light sources close to a single wavelength can be used as illumination light, it is possible to obtain a projected image with excellent color tone reproducibility.

Further, the image projection display device according to the present invention is
Since laser light can be used as a light source, it is possible to obtain a projection image with an extremely wide focus range, and it is possible to obtain a projection image that is relatively flexible in the shape and form of the projection surface.

The above-mentioned aspects can be combined as much as possible.

Embodiments of the present invention will be described in detail below with reference to the drawings. It is needless to say that the two-dimensional reflective cell array device that can be used in the present invention is not limited to the DMD manufactured by TI Co., Ltd. described above, and a reflective liquid crystal device can be used.

When using a liquid crystal device, although not shown in the figure, it goes without saying that the optical system is constructed so that the illumination light is incident at an appropriate incident angle.

(First Embodiment) FIG. 1 is a view showing the basic arrangement of an image projection display apparatus according to the first embodiment of the present invention. The light source units 101, 102, and 103 constitute light source units that emit the three primary colors of red (R), green (G), and blue (B), respectively. The light source unit 101 includes, for example, a plurality of red high-intensity light emitting diodes that emit short-wavelength light having a wavelength of 660 nm and are densely arranged in a matrix with the same light emitting direction. A reflecting mirror may be provided on the back surface to enhance the light-collecting property. With the same structure, the light source unit 102 is composed of, for example, a green high-intensity light emitting diode that emits short-wavelength light having a wavelength of 525 nm, and the light source unit 103 is formed of, for example, a blue high-intensity light-emitting diode that emits short-wavelength light of a wavelength of 470 nm.

Light source unit 101 or light source unit 10
2 or the planar light source light emitted from the light source unit 103 corresponds to the condenser lenses 104, 105, 1
After being condensed by 06, it is incident on the cross prism 107, and then is incident on the horizontal scanning mirror 108 to be reflected. The cross prism 107 has a function of integrating the light source light from each light source unit into the same optical path and making the light incident on the horizontal scanning mirror 108. The light source light reflected by the horizontal scanning mirror 108 is incident on the vertical scanning mirror 109, is reflected, and is incident on the reflecting surface of the two-dimensional reflection cell array device 110.

As the horizontal scanning mirror, for example, a high-speed rotating polygon mirror can be used to realize high-speed scanning, but any means can be used as long as it can perform horizontal scanning at high speed and can realize a small space. Since the horizontal scanning mirror may have a lower scanning speed than the horizontal scanning, for example, a galvano mirror can be used, but any means can be used as long as it can realize a desired scanning speed and a small space like the vertical scanning means. Here, the horizontal scanning refers to the scanning in the longitudinal direction of the two-dimensional reflective cell array device 110 corresponding to the horizontal direction of the projected image, and refers to the vertical direction and the scanning in the direction perpendicular to the horizontal direction.

On the reflecting surface of the two-dimensional reflective cell array device 110, the light from the light source is emitted from the horizontal scanning mirror 108.
By the vertical scanning mirror 109, the states 113 and 114 are two-dimensionally scanned with a predetermined width in the horizontal and vertical directions and a predetermined cycle. In this state, it is possible to create uniform illumination by the afterimage phenomenon that the visual sense has by moving the light source light having a plurality of illumination irregularities arranged so as to convolve at high speed. Therefore, it is possible to effectively eliminate the uneven illumination, which is difficult to avoid when a plurality of high-intensity light emitting diodes are configured to obtain the light amount, without causing the light amount loss of the light diffusing means.

The light source light incident on the two-dimensional reflection cell array device 110 is projected as a projection surface via the projection optical system 111 according to the reflection angle of each reflection cell of the two-dimensional reflection cell array device 110 corresponding to the projection image. The image is projected on the screen 112 to form an image on the screen 112. The light source light emitted from the light source unit 101, the light source unit 102, and the light source unit 103 projects the red component image forming the projection color image data, and the red light source light projects the green component image from the light source unit 101. When the green light source light from the light source unit 102 projects a blue component image, the blue light source light is emitted from the light source unit 103 and sequentially switched in time division without interruption, and the red component image and the green color are displayed on the screen 112. By projecting the component image and the blue component image, one projected color image is generated by utilizing the image synthesis effect by the visual afterimage.

FIG. 2 is a diagram showing the functional blocks of this embodiment. The image data input unit 121 inputs image output data output from an information device (not shown) having an image output function, such as a personal computer, a video recorder, a digital camera, or a TV device. The image data is premised on a color image composed of image data of a red component image, a green component image, and a blue component image.

The input image data has a resolution conversion unit 12
2 and is converted into a resolution that satisfies the resolution expression capability of the projected image of the present image projection display device and that is determined by the resolution of the input image data. The image data whose resolution has been converted and output is input to the image processing unit 123.
In the image processing unit 123, in addition to γ correction and general filter processing, processing for improving color reproducibility and processing for correcting projection distortion of a projected image are performed.

The image-processed image data is input to the frame buffer 124. That is, the red component image data is input to the frame buffer R, the green component image data is input to the frame buffer G, and the blue component image data is input to the frame buffer B for temporary storage.

The image data output from the frame buffers R, G, B is input to the 2D reflection cell array drive controller 125, and the two-dimensional reflection cell array is associated with the pixel gradation value of each image data. Device 11
The amount of reflection of each minute reflection cell of 0 is controlled, and the brightness of the reflected light is adjusted according to each pixel of the projected image.

The amount of reflection is controlled by the reflection angle of the cell in the case of a mirror cell and the switching control amount of the reflection angle (timing, duty, switching frequency, etc.), and by the polarization angle of the liquid crystal in the case of a liquid crystal cell.

Regarding the processing timings for the resolution conversion unit 122 and the image processing unit 123, the processing timing control unit 126 obtains the control timing corresponding to the image data input by the image data input unit 121, and outputs the processing timing from the processing timing control unit 126. Given by the timing signal. Further, a timing signal for temporarily storing image data in the frame buffer 124 and a timing signal for image switching to the 2D reflective cell array drive control unit 125 from the processing timing control unit 126 via the scanning mirror & 2D reflective cell array drive timing control unit 127. Is given.

The scanning mirror & 2D reflection cell array drive timing control unit 127 is a horizontal scanning mirror drive control unit 128.
Further, the timing control of driving start / stop is performed for the vertical scanning mirror drive controller 129. The horizontal scanning mirror drive control unit 128 and the vertical scanning mirror drive control unit 129 perform drive control for performing a predetermined operation on the horizontal scanning mirror device 108 and the vertical scanning mirror device 109.

The RGB light source emission switching control unit 130 includes a scanning mirror & 2D reflection cell array drive timing control unit 12.
The projection switching timing signals of the red component image data, the green component image data, and the blue component image data from 7 are obtained to control the light emission switching of the light source unit 101, the light source unit 102, or the light source unit 103, and control the same. A signal is given to the light source light emission drive unit 131 to cause the light source unit 10
1 or the light source unit 102 or the light source unit 103 is sequentially driven to emit light.

Further, the red component image data, the green component image data, and the blue component image data obtained from the image processing unit 123 are input to the gradation data maximum value detection unit 133 and the respective maximum values are calculated. It Light source output controller 132
Is the light source unit 10 using each calculated maximum value.
In order to control the output of the light source light from the light sources 1, 102 and 103, the light source light emission drive unit 131 that drives the light source units 101, 102 and 103 is controlled.

FIG. 3 is a conceptual diagram for explaining the irradiation state of the light source light on the two-dimensional reflective cell array device 110 in this embodiment. Here, the case of red light source light will be described as an example. On the reflecting surface of the two-dimensional reflective cell array device 110, the light source light pattern has a horizontal scanning mirror 108, a vertical scanning mirror 109, and an optical lens 1 that makes the incident angle of the light source light on the two-dimensional reflective cell array device 110 uniform.
By 81, the movement from the state 113 to the state 114 is repeated as shown in the figure, and the two-dimensional movement is performed at high speed.
Thereby, the light source light pattern which is actually non-uniform is visually perceived as a uniform surface light source.

FIG. 4 shows a two-dimensional reflective cell array device 1.
10 shows an example of a two-dimensional movement of the light source light pattern on 10. In the light source unit 101, the light source light pattern emitted from the red high-intensity light emitting diodes densely arranged in a matrix with the same light emitting direction is formed on the reflecting surface 132 on the two-dimensional reflective cell array device 110 as shown in the figure. In this case, the arrangement pitch of the high-intensity light emitting diodes is set to the horizontal scanning width and the vertical scanning width, and the amount of movement thereof is set as one cycle, so that high-speed scanning is performed in the horizontal and vertical directions.

However, in this case, it is necessary to adjust so that the individual variations in the amount of emitted light of the high-intensity light emitting diodes forming the array and the light distribution characteristics are made more uniform. The horizontal scanning and the vertical scanning of the light source light pattern may not necessarily correspond to the arrangement pitch of the high brightness light emitting diodes. One surface of the light source light pattern is a two-dimensional reflective cell array device 1
A mirror is configured so as to move continuously with respect to the reflecting surface 132 on the surface 10, that is, the horizontal scanning width and the vertical scanning width are set to the horizontal width and the vertical width of the reflecting surface on the two-dimensional reflective cell array device 110. You can also

According to this method, since the light distribution characteristic of the entire light source light pattern is visually convoluted, there is an advantage that it is not required to strictly adjust the individual variation of the emitted light amount of the high brightness light emitting diode. However, it is necessary to scan at a higher speed.

In FIG. 5, the horizontal axis represents relative time, and the light source R of the light source unit 101, the light source G of the light source unit 102,
6 shows an example of the light emission timing of the light source B of the light source unit 103 and the horizontal scanning and vertical scanning driving timing of the light source light pattern. In this figure, the light from each light source is in a state of pulsed light emission for the purpose of high light emission. The light emission time is set to t, and the time T is set to 1 cycle, and switching light emission is sequentially performed to the light source R, the light source G, and the light source B. The horizontal scanning and the vertical scanning of the light source light pattern may be repeated at a predetermined frequency that does not depend on time as shown in the figure, but the setting is such that the uneven illumination cannot be perceived visually on the projection surface at least within the light emission time t. Has become.

The light emission time t of the light source R, the light source G, and the light source B is
The respective luminosity factors may be taken into consideration and adjustments may be made so that they can be perceived with similar visual luminosity, and they need not necessarily be at the same time. The time T is set to 1/30 seconds or less so that a color image is formed in a general three-primary-color sequential method.

In FIG. 6, when image data is given, the light source R of the light source unit 101, the light source G of the light source unit 102, and the light emission amount of the light source B of the light source unit 103 are associated with each other according to the pixel gradation value. 6 shows an example of a control method of the switching control amount of the reflection angle of each minute reflection cell of the two-dimensional reflection cell array device 110. In this figure, the maximum value of the switching control amount is set to Fmax, and the reflected light amount changes from zero to Fmax.
Up to can be changed.

Fmax is a two-dimensional reflective cell array device 1
The amount of light reflected on the projection surface by each of the ten minute reflection cells is a control amount that can be maximized. Now, assuming that the maximum pixel gradation of the data of the red component image is Y1, the light source unit 10
The light source output of the light source R of 1 is controlled to a value associated with Y1. The same control is performed for the green component image data and the blue component image data. That is, since the light source output is adjusted according to the maximum value of the pixel gradation of the image data to be projected, there is no need to constantly maintain the maximum light source output and consume unnecessary power as in the conventional case.

At the same time, the switching control amount of the reflection angle of each minute reflection cell of the two-dimensional reflection cell array device 110 is related and controlled so that the control amount corresponds to Fmax at the maximum pixel gradation value Y1. . In the figure, these relationships are described as having a linear relationship, but it goes without saying that the relationship may be non-linear so that the relationship between the pixel gradation and the brightness of the projected image becomes natural in terms of visual sensitivity. Yes.

FIG. 7 shows another embodiment of the scanning means of the light source light pattern in comparison with FIG. The horizontal scanning mirror 141 and the vertical scanning mirror 142 can also realize the same function by a micromirror scan using a minute size torsional resonance capable of high speed scanning. When the micromirror scan method is used, the light source light pattern is reduced by a reduction optical system because its reflection surface is small, and after horizontal and vertical scanning, it is enlarged again by the enlargement optical system 143 on the reflection surface of the two-dimensional reflection cell array device 110. In addition, it is necessary to devise to convert the same incident angle to make the incident.

FIG. 8 shows the light source unit 101, the light source unit 102, and the light source unit 103 described in FIG. 1 or 7.
It is a figure for demonstrating the embodiment which used the laser diode (henceforth LD) instead of. Similar to the above embodiment, the red LD 151, the green LD 152, and the blue LD
The red, green, and blue laser lights from 153 are integrated in the optical path by the cross prism 107, and are sequentially oscillated in time division. The figure shows a state where the red LD 151 is oscillating.

The laser light emitted from the cross prism 107 is a horizontal scanning mirror 141 and a vertical scanning mirror 142.
The two-dimensional scanning is performed by the above, and the light is incident on the reflection surface of the two-dimensional reflection cell array device 110 via the optical lens 154. The optical lens 154 has a main purpose of changing the direction of the laser light scanned on the reflection surface of the two-dimensional reflection cell array device 110 so that the laser light has the same incident angle. The reflecting surface is given an appropriate blur without intentionally focusing, so that the light spot of the laser light is appropriately enlarged.

The light spot of the laser beam having an appropriate size incident on the reflecting surface of the two-dimensional reflective cell array device 110 is two-dimensionally scanned at high speed on the reflecting surface, and the same as in the above embodiment. On the screen 112, it is perceived as uniform illumination light due to a visual afterimage phenomenon. The method of forming an image is the same as that in the above embodiment.

In the same way as in the prior art, in which an image is displayed by irradiating a fluorescent screen with an electron beam of a CRT, laser light of the three primary colors is modulated in optical output according to the pixel gradation of image data corresponding to each. There is a method of forming an image by two-dimensionally high-speed scanning directly on the projection surface.

However, since it is necessary to use a high-power laser in order to obtain the brightness of the projected image, there are serious problems such as damage to visual tissues when the laser beam is mistakenly viewed directly. This is because the laser light is not diffused due to its coherent property, and when it is imaged by the eyeball, high energy concentrates on a minute area. Further, in forming a projected image, the point light sources are arranged on the projection surface with high positional accuracy, and high-speed scanning that can be perceived as a planar image by a visual afterimage phenomenon is required, so an advanced scanning mechanism is required, There are many problems in terms of product reliability and cost.

On the contrary, when the laser light is used as the light source light pattern as in this embodiment, since the irradiation area of the laser light is enlarged and projected, the energy irradiation to the entire projection surface is performed by the conventional method. Similarly, the energy of the laser light is dispersed and the energy per unit area of the projected light flux can be significantly reduced. Further, since it is used as a light source light pattern instead of forming a projected image, scanning may be performed under relatively mild conditions.

Furthermore, since there is no diffusion of laser light beyond a predetermined level, the characteristic that the laser light has an infinite depth of field can be maintained, and everything is in focus even when projected onto a three-dimensional surface. A projected image is obtained. It can be expected to expand the range of applications by creating a so-called screen-free state that has never existed before. By utilizing the characteristic of laser light having a single wavelength, the range of color tone expression by the three primary colors is significantly expanded, and an image with excellent color reproducibility that cannot be obtained by conventional electronic display devices can be obtained.

FIG. 9 shows the light source unit 101, the light source unit 102, and the light source unit 10 described with reference to FIG. 1 or 7.
An example in the case of implementing 3 by integrating them will be shown. The light source unit 161 is made up of a mixture of a plurality of red, green, and blue high-luminance light emitting diodes, and the light emitting directions are the same, and they are densely arranged in a matrix. For example, the arrangement as shown in FIG. 10 is also given as an example. In this case, the red, green, and blue high-intensity light emitting diodes are arranged in a predetermined order in the horizontal direction and the vertical direction, and the same color should be repeated by moving three array pitches. Is desirable.

Even in the case of this light source unit 161, red,
The green and blue high-intensity light emitting diodes are sequentially switched by time division to emit light. Light source unit 161
The emitted light source light pattern is condensed by the condensing lens 162, is two-dimensionally scanned as in the embodiment described in FIG. 1, and is then applied to the two-dimensional reflective cell array device 110. In this case, the horizontal and vertical movement widths of the light source light pattern can be set to three times the arrangement pitch of the high brightness light emitting diodes. By doing so, as described above, a uniform light source light of red, green, or blue can be obtained by using the visual afterimage phenomenon.

(Second Embodiment) The second embodiment will be described below with reference to FIG. FIG. 11 shows an example in which the configuration described in the first embodiment is further simplified.
Instead of the light sources 101, 102, 103 described in FIG. 1, light source units 301, 302, 303 of another embodiment are configured to emit red, green, and blue of three primary colors, respectively. The light source light emitted from these light source units 301, 302, 303 is collected by the condenser lenses 304, 30 respectively.
The light is condensed by 5, 306 and is incident on the reflection surface of the two-dimensional reflection cell array device 110 via the cross prism 307 and the optical lens 308.

The optical lens 308 has a function of vibrating two-dimensionally in a predetermined movement width in the direction orthogonal to the optical axis, and removes the light amount unevenness of the light source light pattern from the cross prism 307 by utilizing the visual afterimage phenomenon. , Seemingly uniform.

The light source light incident on the reflecting surface of the two-dimensional reflective cell array device 110 is switched between red, green and blue in a time division manner as in the first embodiment described with reference to FIG. Although FIG. 11 shows the red state 309,
As shown in the figure, the reflective surface of the two-dimensional reflective cell array device 110 is binary moved. The light source light pattern reflected from the reflecting surface of the two-dimensional reflective cell array device 110 is projected on the screen 112 via the projection optical system 111 according to the control amount of the two-dimensional reflective cell array device 110 corresponding to the image data.

The light source unit 3 will be described below with reference to FIG.
The configurations of 01, 302 and 303 will be described in more detail.
The purpose of this light source unit is to reduce the light emitting area from the plurality of LEDs by collecting the light source light emitted from the light source LED 310 with the plurality of optical fibers 311 having the ends bundled. The arrangement of the optical fibers is configured so as to reflect the arrangement of the LEDs as it is.

As shown by the balloon, the distribution of the light quantity emitted from the optical fiber is such that the respective light distribution distributions are superposed, and the unevenness of the light quantity is improved to a considerable level. Therefore, the effect of removing the unevenness of the light quantity can be obtained together with the spatial vibration of the light source light pattern by the optical lens 308.

FIG. 13 is a diagram showing an example of different forms for producing the spatial vibration of the light source light pattern. In FIG. 13, the purpose is to oscillate the light source units 301, 302, 303 themselves in the direction orthogonal to the optical axis to obtain the same effect as that of the above embodiment.

(Third Embodiment) FIG. 14 is a diagram for explaining the third embodiment. In the third embodiment,
This is an embodiment in which a projection optical system for image data shown in the first and second embodiments is commonly used, and a function of capturing an image of a subject located on a projection surface is added. The projection function is similar to that of the first embodiment described with reference to FIG.
The imaging function will be described.

The reflected light from the ambient light of the subject 401 located at the same position as the screen 112 is incident on the reflecting surface of the two-dimensional reflective cell array device 110 by using the projection optical system 111 as an image pickup optical system, and the imaging optical system. An image is formed on the two-dimensional image sensor 403 via 402. At this time, it is assumed that the two-dimensional reflective cell array device 110 is composed of micro mirror cells such as DMD.

In the image forming optical system 402 and the two-dimensional image pickup device 403, all the minute mirror cells of the two-dimensional reflective cell array device 110 are controlled to the same angle as in the state B, and the incident light from the projection optical system 111 can be received. It is arranged like this. Two-dimensional reflective cell array device 11
The reflection angle of the micro mirror cell of 0 is controlled according to the gradation of the image data at the time of projection, but when operating the imaging function, it is simply a reflection mirror for receiving the subject image on the two-dimensional imaging device 403. Operate.

FIGS. 15 to 17 are diagrams for explaining additional function blocks when the above-mentioned image pickup function is added. The parts common to those in FIG. 2 have the contents already described, and therefore the additional imaging function will be described.

The image incident from the imaging optical system 402 is 2
Under the control of the three-dimensional imaging device drive control unit 404, the two-dimensional imaging device images and photoelectrically converts the image. The photoelectrically converted output is separated into three primary color image frame data, and the frame buffer R of the frame buffer 405
It is temporarily stored in each of the frame buffer G and the frame buffer B.

The picked-up image data stored in the frame buffer 405 is input to the picked-up image processing unit 406 and subjected to image processing as required. For example, if the screen 112 is capable of drawing characters / graphics such as whiteboard, the subject 401 can be the drawn characters / graphics.

When inputting them using the image pickup function of this embodiment, the picked-up image processing unit 406 performs a binarization process or character recognition. The image data processed by the captured image processing unit 406 is input to the resolution conversion unit 122 and converted into a resolution suitable for the projection image, and then input to the image processing unit 123 to be used as a projection image again.

The image processing section 123 may combine and output the above-mentioned captured images in addition to various image processes. By doing this, even if you erase the contents added to the projection surface when you explain and discuss using the projection screen, you can re-project the contents and record it as reuse data with the explanation screen. It is possible to leave it. Therefore, it is not necessary to hard copy the contents entered on the projection screen each time, and the convenience can be enhanced.

Switching between the projection function and the image pickup function is performed by
It is configured to be switched by the imaging mode switching unit 407 to select that function. By adding this function, it is possible to capture images as well as project images.
The range of various uses becomes extremely wide.

Further, in the present invention, various other known techniques can be applied to the individual light source generating mechanism, light source scanning mechanism, image forming optical system, and image pickup mechanism other than those described above.

[0075]

As described above, according to the present invention described in detail,
It is possible to provide an image projection display device that is lightweight, silent, low power consumption, and has excellent compatibility with digital information devices and interfaces, and to create an opportunity to make a presentation on a large screen with excellent portability. You can

[Brief description of drawings]

FIG. 1 is a diagram showing a basic configuration showing a first embodiment of an image projection display device according to the present invention.

FIG. 2 is a diagram showing functional blocks of the present embodiment.

FIG. 3 is a conceptual diagram illustrating an irradiation state of light source light on the two-dimensional reflective cell array device 110 in the present embodiment.

4 is a diagram showing an example of two-dimensional movement of a light source light pattern on a two-dimensional reflective cell array device 110. FIG.

FIG. 5 shows the light source unit 101 with the horizontal axis representing relative time.
5 is a diagram showing an example of light emission timings of a light source R, a light source G of a light source unit 102, a light source B of a light source unit 103, and drive timings of horizontal scanning and vertical scanning of a light source light pattern.

FIG. 6 is a light source unit 1 when image data is given.
Two-dimensional reflective cell array device 110 that is associated with the light emission amounts of the light source R of 01, the light source G of the light source unit 102, and the light source B of the light source unit 103 according to the pixel gradation value.
It is a figure which shows an example of the control method of the switching control amount of each micro mirror cell reflection angle of.

FIG. 7 is a diagram illustrating another embodiment of a light source light pattern scanning unit in contrast to FIG. 1.

FIG. 8 is a light source unit 10 described with reference to FIG. 1 or 7.
1 is a diagram for explaining an embodiment in which a laser diode (hereinafter, LD) is used instead of the light source unit 102 and the light source unit 103.

FIG. 9 is a light source unit 10 described with reference to FIG. 1 or 7.
It is a figure which shows the example in case 1 and the light source unit 102 and the light source unit 103 are integrated and implemented.

FIG. 10 is a diagram showing an example of a case where a plurality of red, green, and blue high-luminance light emitting diodes are mixed and arranged.

FIG. 11 is a diagram for explaining the second embodiment of the present invention.

FIG. 12 is a diagram for explaining the configuration of light source units 301, 302, 303 in more detail.

FIG. 13 is a diagram showing an example of different forms for creating spatial vibration of a light source light pattern.

FIG. 14 is a diagram for explaining the third embodiment of the present invention.

FIG. 15 is a diagram (No. 1) for explaining an additional function block when an imaging function is added in the third embodiment.

FIG. 16 is a diagram (No. 2) for explaining an additional function block when an imaging function is added in the third embodiment.

FIG. 17 is a diagram (No. 3) for explaining the additional function block when the imaging function is added in the third embodiment.

[Explanation of symbols]

101 light source unit 102 light source unit 103 light source unit 104 Condensing lens 105 Condensing lens 106 Condensing lens 107 Cross prism 108 Horizontal scanning mirror 109 vertical scanning mirror 110 two-dimensional reflective cell array device 111 Projection optical system 112 screen (projection surface)

Claims (11)

[Claims] 1. An image projection display apparatus for modulating and projecting illumination light output from a light source based on image data, comprising: a light source section having a plurality of light source members having light distribution characteristics in close proximity; A two-dimensional reflective cell array device including minute reflective cells, and an illumination light output from the light source unit, which is two-dimensionally scanned within a predetermined scanning range and a predetermined scanning frequency, on a reflective surface of the two-dimensional reflective cell array device. An illumination light scanning unit that irradiates, an element drive control unit that controls the drive of the two-dimensional reflective cell array device according to the gradation of the input image data, and an element drive control unit that reflects the drive control of the two-dimensional reflective cell array device. An image projection display device, comprising: a projection optical unit configured to project the illumination light from the illumination light scanning unit as projection light onto a predetermined projection surface. 2. The light source unit includes a red light source, a green light source, and a blue light source.
The image projection display device according to claim 1, wherein the image projection display device comprises a surface light source of a type. 3. The image projection display apparatus according to claim 2, wherein the surface light source is a high brightness LED. 4. The image projection display apparatus according to claim 2, wherein the surface light source is a high brightness laser light emitting element. 5. The image projection display apparatus according to claim 2, wherein the surface light source synthesizes and outputs the three types of light rays. 6. The surface light source switches the order of light emission of red, green, and blue in accordance with each frame data of red, green, and blue of the input image data. The image projection display device according to. 7. The illumination light scanning unit has predetermined horizontal and vertical directions so that the non-uniform illumination light output from the light source unit can be perceived as uniform projection illumination light due to the afterglow characteristic of human vision. The image projection display device according to claim 1, wherein two-dimensional scanning is performed according to a scanning period and a scanning width. 8. A detection means for detecting the maximum value of the frame data of the input video data is further provided, and the light source section controls the light emission output in accordance with the detected maximum value, 2. The image projection display apparatus according to claim 1, wherein the gradation control is performed by associating the value with the drive control that represents the maximum gradation of the two-dimensional reflective cell array device. 9. The light source unit includes three types of red, green, and blue.
The image projection display device according to claim 1, wherein the light source members of different types are arranged in an array that is repeated in a predetermined order in the horizontal and vertical directions. 10. The projection optical section is used as an imaging optical system to form an image of an object corresponding to the projection surface on a reflection surface of the two-dimensional reflection cell array device, and the formed object image is the two-dimensional image. The image projection display apparatus according to claim 1, wherein the reflection angle of the reflection cell array device is uniformly controlled to form an image on a two-dimensional image pickup device arranged at a predetermined position. 11. An image projection display device for modulating a laser light source output from a light source based on image data and projecting the laser light source, the laser light source section emitting a laser point light source, and the point emitted from the laser light source section. A laser scanning unit that two-dimensionally scans a light source with a predetermined scanning range and a predetermined scanning frequency; a light emission drive control unit that performs light emission drive control of the laser light source unit according to a gradation of input image data; A projection optical unit that projects the spot illumination light emitted by the laser scanning unit onto a predetermined projection surface, and a connection unit arranged at a predetermined position so that the spot illumination light projected onto the projection surface is imaged and incident as a subject. An image optical system, an imaging unit for imaging the illumination light imaged by the imaging optical system, and a projection plane position of the spot illumination light emitted by the laser scanning unit. If, based on the output of the imaging unit, the image projection display apparatus characterized by comprising an image construction unit that constitute the captured image of the object on the projection surface.