JPH0767064A - Projective laser image display device - Google Patents

Abstract

PURPOSE:To provide a projective laser image display device which makes high- output image display possible while miniaturizing a projector. CONSTITUTION:Laser light sources 1a, 2a and 3a for emitting laser beams in green are used for light sources 1, 2 and 3 and further, wavelength converters 1b and 3b excited by the laser beams of green so as to generate high-output red laser beams or ultraviolet laser beams are also used for the light sources 1 and 3. Thus, visible laser beams L1 and L2 in red and green are outputted from the light sources 1, 2 and 3, invisible ultraviolet laser beams L3 are outputted respectively, and images of red and green are displayed on a screen 11a coating the screen, which is irradiated with the laser beams L1, L2 and L3 of a screen 11 paired with the projector, with a phosphor excited by ultraviolet rays and emitted in blue and by irradiating the screen 11a with the laser beams L1 and L2. Then, the image in blue is displayed on the screen 11a by exciting the phosphor by irradiating the screen with the laser beam L3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type laser image display device for displaying a color image composed of images of three primary color patterns of red, green and blue. The present invention relates to a projection type laser image display device capable of simultaneously displaying an image.

[0002]

Projection for displaying an image such as a television image by intensity-modulating laser light of three colors of red, green and blue, and scanning the intensity-modulated laser light horizontally and vertically on a screen. Type laser image display devices have been widely provided. In this type of projection-type laser image display device, a large-sized but high-power gas laser such as Ar or kr has conventionally been used as a laser light source provided on the projector side. However, in recent years, it has become possible to obtain a green light laser while reducing the size of the light source by using a high-output second harmonic generator that combines a laser diode-pumped solid-state laser and a nonlinear optical crystal as a wavelength conversion element. With this second harmonic generator, it has become possible to obtain a high output ultraviolet laser which is the second harmonic of the green light laser. Furthermore, for red light, a relatively small high-power laser light source can be obtained with a dye laser excited by a green laser, and there is a temporary solution.

[0003]

However, it is conventionally difficult to obtain a small high-power laser, especially for blue light. Therefore, a projection-type laser image display device is provided while maintaining high-power image display. There is a problem that it is difficult to downsize the projector. On the other hand, a projection type laser image display device using an ultraviolet laser is disclosed in JP-A-53-21.
944 and Japanese Patent Laid-Open No. 2-199975. According to these projection type laser image display devices, there is no problem in the image display device of one color, but when the phosphors of two or more colors are used, the phosphors of the respective colors are applied in stripes on the screen, In order to irradiate a laser beam on a phosphor that emits light of a color, for example, Japanese Patent Laid-Open No. 22199/1990
It is necessary to use the method as described in 5. That is, it is necessary to detect the beam position on the screen and synchronize the modulation of the laser light according to the scanning position of the laser light, which causes a problem that the configuration of the projector becomes complicated accordingly. Further, when changing the screen size or the configuration (format, such as NTSC, PAL, HV, etc.), there is a problem that a screen with a different stripe pitch is separately required.

The present invention has been made in view of the above circumstances, and an object thereof is to use only a laser light source that can be downsized and to downsize a projector without complicating the structure while achieving high output. It is to provide a projection type laser image display device capable of displaying an image.

[0005]

In order to achieve the above-mentioned object, the present invention provides three scanning laser lights each of which is modulated in accordance with the three patterns of red, green and blue images forming a color image. A projection-type laser image display device comprising: a light emitting source; and a display body on which three patterns of scanning laser light output from the three light emitting sources are respectively irradiated, and the color image is displayed by the irradiation of the scanning laser light. And one of the three light emitting sources is configured to output the scanning laser light as an ultraviolet laser light,
The other two light emitting sources are configured to output the scanning laser light as visible laser light having a color of a pattern corresponding to the light emitting sources, and are irradiated with the scanning laser light of the display body. The surface is uniformly coated with a phosphor that is excited by the ultraviolet laser light and emits light in a color of a pattern corresponding to the one light emitting source. Further, in the present invention, the one light emitting source is provided corresponding to a blue pattern image, and the phosphor is excited by the ultraviolet laser to emit blue light.

[0006]

According to the present invention, red, which constitutes a color image,
Any one of the scanning laser light modulated according to the image of three patterns of green and blue is output by the ultraviolet laser, and the fluorescent laser on the display is excited by the ultraviolet laser,
In order to emit light in one of red, green and blue, red,
Even when one of green and blue visible laser light cannot be miniaturized, the projector of the projection type laser image display device can be miniaturized without complicating the configuration and high-power image display. It can be performed. Therefore, it is particularly effective, for example, when a light source that outputs a blue visible laser beam, which has been difficult to miniaturize in the past, is omitted and the projector of the projection laser image display device is miniaturized.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a projector side of a general projection type laser image display device to which the present invention is applied. As shown in FIG. 1, the projection-type laser image display device includes three light sources 1, 2, and 3, which respectively emit laser beams L1, L2, and L3 corresponding to three patterns of red, green, and blue images, and a light source. Three light modulators 4,5,6 for respectively modulating the laser beams L1, L2, L3 output from 1, 2, 3 according to the RGB pattern of the display image, and the light modulators 4,5, 6 Three laser beams L1, L2
A color combining system 7 that combines L3 into one laser beam L, a horizontal deflector 8 that scans and deflects the laser beam L in the horizontal direction, and a vertical deflector that scans and deflects the laser beam L scanned and deflected in the horizontal direction in the vertical direction. A deflector 9 and a projection optical system 10 for projecting the laser light L scanned and deflected in the horizontal and vertical directions onto a screen 11 are provided, and the light sources 1, 2, 3 and the optical modulators 4, 5, 6 are provided. The light source is composed of.

FIG. 2 is a block diagram specifically showing the elements in the projector in the projection type laser image display apparatus according to one embodiment of the present invention, and FIG. 3 is a projection type laser image according to one embodiment of the present invention. It is a schematic block diagram of the screen in a display apparatus. In the projection type laser image display device of the present embodiment, the light source 3 corresponding to the blue pattern image is replaced by another light source which is easy to miniaturize without using a high output blue laser light source which is difficult to miniaturize. is doing. That is, the light source 1 is a compact high-power green laser light source 1a that generates a second harmonic by combining a laser diode-pumped solid-state laser and a wavelength conversion element such as a nonlinear optical crystal, and the laser light source 1a is used as a pump light source. The wavelength converter 1b is composed of a dye, a solid laser medium, a non-linear optical crystal, or the like, and generates a high-output red laser light L1. Similarly, the light source 2
Is composed of the same laser light source 2a as the laser light source 1a, the light source 3 is the same laser light source 3a as the laser light sources 1a and 2a, and the laser light source 3a is used as an excitation light source and is composed of a non-linear optical crystal or the like and has a high output. And a wavelength converter 3b for generating the ultraviolet laser light L3.

The laser diode pumped solid state lasers of the laser light sources 1a, 2a and 3a are, for example, Nd:
YAG can be used, in which case the wavelength 532
A green laser beam with an output of several W in nm can be obtained. After the conversion by the wavelength converter 1b, an arbitrary red laser light L1 having a wavelength of about 610 to 650 nm can be obtained by selecting a dye or a solid laser medium, while the conversion by the wavelength converter 3b is performed. An ultraviolet laser beam L3 having a wavelength of 266 nm is obtained. Green laser light L of laser light source 2a
2 is used as it is.

The optical modulators 4, 5 and 6 are adapted to receive the laser beams L1, L2 and L2 according to the image brightness signals of red, green and blue.
Acousto-optic elements 4a, 5a, 6a for respectively modulating L3
And beam shaping lenses 4b, 4c, 5b, 5c, 6 arranged before and after the acousto-optic elements 4a, 5a, 6a for shaping the laser beams L1, L2, L3 for high-speed modulation.
b and 6c.

The color synthesizing system 7 is a total reflection mirror 7
a and two dichroic mirrors 7b and 7c. The total reflection mirror 7a is arranged on the optical path of the red laser light L1 from the light source 1. The dichroic mirror 7b transmits red light and reflects green light. The dichroic mirror 7b emits green laser light L from the light source 2.
It is arranged at the intersection of the optical path of 2 and the optical path of the red laser light L1 reflected by the total reflection mirror 7a. This dichroic mirror 7b allows the laser light L1 and the laser light L
2 and are combined. Further, the dichroic mirror 7c reflects ultraviolet light, and the optical path of the ultraviolet laser light L3 from the light source 3 and the dichroic mirror 7b.
Are arranged at the intersections with the optical paths of the red laser light L1 and the green laser light L2 that are transmitted or reflected. The laser beams L1 and L2 and the laser beam L3 are combined into one laser beam L by the dichroic mirror 7c.

The horizontal deflector 8 is composed of a rotary polygon mirror (polygon mirror) that rotates at a high speed. In this embodiment, it is 8 minutes per minute.
A 25-sided structure with 1,000 rotations is used. As the vertical deflector 9, a galvano mirror that rotationally vibrates at 60 Hz is used. Further, the projection optical system 10 guides the laser light L to the horizontal and vertical deflectors 8 and 9, and condenses the laser light L deflected horizontally and vertically by the relay lenses 10a and 10b. When,
A reflection mirror 10c that reflects the laser light L that has passed through the relay lenses 10a and 10b and guides it onto the screen 11.
It consists of and. The size of the image displayed on the screen 11 can be freely changed by changing the magnification of the relay lenses 10a and 10b.

FIG. 3 is a cross-sectional view of the screen 11, in which a phosphor 11b that emits blue light by ultraviolet excitation is provided on the surface 11a irradiated with the laser beams L1, L2 and L3.
Is evenly applied. Surface 11 of this screen 11
When the laser light L is irradiated onto a, the laser lights L1 and L2, which are visible light of the laser light L, are emitted from the phosphor 1
Without being absorbed by 1b and without exciting the phosphor 11b, it is transmitted through the phosphor 11b and scattered on the surface 11a. On the other hand, the ultraviolet laser light L3, which is an invisible light of the laser light L, excites the phosphor 11b to emit the blue light 12, and the blue light 12 is scattered on the surface 11a. Luminous efficiency of the phosphor 11b excited by ultraviolet rays is generally high. Therefore, by irradiating the phosphor 11b with the laser light L3, blue light with high brightness can be obtained.

In the projection type laser image display apparatus of the present embodiment having the above-mentioned configuration, the laser beams L1, L2 and L3 are combined into three laser beams by the horizontal and vertical deflectors 8 and 9 as laser beams L. The same deflection scanning is performed, and the same position on the surface 11a of the screen 11 is irradiated. The light emitted from the phosphor 11b is the screen 1 irradiated with the laser light L.
1 is limited to the portion of the beam spot on the surface 11a, and the scattering of the visible laser light L1 and L2 is similar to the emission of the phosphor 11b, and the surface 11 irradiated with the laser light L
Since it occurs only in the part of the beam spot on a, red,
The three colors of green and blue are easily combined on the beam spot.

As described above, according to the present embodiment, on the projector side, the laser light sources 1a, 2a and 3a for emitting green laser light such as Nd: YAG are set as the light sources 1, 2, and 2.
In addition, the light sources 1 and 3 are used in combination with wavelength converters 1b and 3b that generate high-power red laser light and ultraviolet laser by being excited by green laser light. 3 outputs the red visible laser light L1, the green visible laser light L2, and the invisible ultraviolet laser light L3, respectively, and irradiates the laser light L1, L2, L3 of the screen 11 paired with the projector. The phosphor 11b, which is excited by ultraviolet rays and emits blue light, was uniformly applied to the surface 11a formed.

For this reason, the red visible laser light L1 and the green visible laser light L are at the beam spot on the surface 11a of the screen 11 onto which the combined laser light L is irradiated.
UV laser light L3 that scatters 2 or is invisible light
To excite the phosphor 11b to emit blue light and scatter the blue light to display a color image of three colors of red, green and blue with high brightness without complicating the configuration on the projector side. be able to. Then, according to the present embodiment, by using the laser light sources 1a, 2a, 3a for emitting the green laser light, which are relatively easy to be miniaturized, as the light sources 1, 2, 3, it is possible to miniaturize the projector, Moreover,
It is possible to realize the projection type laser image display device projector side capable of displaying a high output image.

In this embodiment, the phosphor 11b which is excited by ultraviolet rays and emits blue light is provided on the surface 1 of the screen 11.
1a is uniformly applied, and the surface 11a is irradiated with the ultraviolet laser light L3 from the light source 3 corresponding to the image of the blue pattern, but the phosphor is excited by ultraviolet rays and emits red or green light. Is uniformly applied to the surface 11a, and the configurations of the light sources 1, 2 and 3 and the color synthesizing system 7 are appropriately changed correspondingly, and the phosphor is excited on the surface 11a by irradiation of ultraviolet rays to produce a red color. Alternatively, the image of a green pattern may be displayed. Further, in the present embodiment, the laser lights L1, L2, L3 outputted from the light sources 1, 2, 3 are modulated according to the respective patterns of red, green and blue constituting the color image to be displayed. The laser light sources 1a, 2a, and 3a are driven to emit light in accordance with the images of the red, green, and blue patterns, and the laser light L1 is modulated in a modulated state. L2 and L3 are laser light sources 1a,
It is also possible to have a configuration in which the signals are directly output from 2a and 3a.

[0018]

As described above, according to the present invention, three light emitting sources for respectively outputting scanning laser light modulated according to the images of three patterns of red, green and blue forming a color image, A projection-type laser image display device, comprising: a display body which is irradiated with three patterns of scanning laser light output from three light-emitting sources, and the color image is displayed by the irradiation of the scanning laser light. One of the two light emitting sources is configured to output the scanning laser light as an ultraviolet laser light, and the other two light emitting sources are configured to output the scanning laser light to a color of a pattern corresponding to the light emitting sources. Of the visible laser light, and the surface of the display body irradiated with the scanning laser light is excited by the ultraviolet laser light and
Since the phosphors that emit light of the color corresponding to the two light emitting sources are uniformly applied, only the laser light source that can be downsized is used, and the projector can be downsized without complicating the configuration while achieving high output. The image can be displayed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration on a projector side of a general projection type laser image display device to which the present invention is applied.

FIG. 2 is a configuration diagram specifically showing elements in the projector in the projection type laser image display device according to the embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of a screen in a projection type laser image display device according to an embodiment of the present invention.

[Explanation of symbols]

 1, 2 and 3 light source (light emitting source) 4, 5 and 6 light modulator (light emitting source) 11 screen (display body) 11a screen surface 11b phosphor

Claims (2)

[Claims] 1. A light emitting source that outputs scanning laser light modulated according to images of three patterns of red, green, and blue forming a color image, and three patterns output from the three light emitting sources. And a display body on which the color image is displayed by the irradiation of the scanning laser lights, and a projection-type laser image display device comprising: one of the three light-emitting sources. Are configured to output the scanning laser light as ultraviolet laser light, and the other two light emitting sources output the scanning laser light as visible laser light of a color of a pattern corresponding to those light emitting sources. With the configuration, on the surface of the display body irradiated with the scanning laser light,
A projection-type laser image display device, wherein a phosphor that is excited by the ultraviolet laser light and that emits light in a color of a pattern corresponding to the one light emission source is uniformly applied. 2. The projection type laser image display device according to claim 1, wherein the one light emitting source is provided corresponding to a blue pattern image, and the phosphor is excited by the ultraviolet laser to emit blue light. .