JPH1132278A - Projecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-sized projecting device which is high in utilization efficiency of light, has a bright screen, and consumes less electric power having a long service life-light source. SOLUTION: A light-emitting element array section 2 is provided with a plurality of LED lamps, respectively composed of red, green, and blue LED chips. Three R, G, and B primary color light rays Lr, Lg, and Lb which are time-sequentially emitted from the red, green, and blue LED chips are shaped into parallel rays by means of a shaping optical system and made incident to a two-dimensional micro deflecting mirror array 50 after the rays have been reflected by a dichroic mirror 4, and the array 50 time-sequentially performs spatial modulation on the rays according to image signals Sr, Sg and Sb of each color. Then a projection optical system 7 projects enlargedly the modulated parallel rays upon a screen 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projector for projecting multi-tone images using a single two-dimensional spatial light modulator, and more particularly to a projector having high light utilization efficiency, a bright display screen, and a small size. The present invention relates to a projector device having low power consumption and a long light source life.

[0002]

2. Description of the Related Art Recently, with the advent of high-definition television (HDTV) and the spread of personal computers and their use of multimedia, high-definition, large-screen image display of several tens of inches to 200 inches used by a plurality of people and small size have been realized. -There is an increasing demand for weight reduction, and various types of products have been developed for that purpose. In response to this request,
Conventionally, liquid crystal displays, plasma displays,
There are flat displays such as light emitting diode displays.

In recent years, the size of a liquid crystal display has been increased from a 14-inch desktop type to a 25-inch type in which two liquid crystal spatial light modulators are laminated. But,
In the case of a liquid crystal display, the process of fabricating a liquid crystal spatial light modulator is complicated and long, and there are essential problems such as the inability to make a large-sized one and a high price. However, since it is made by laminating several liquid crystal spatial light modulators, it is unavoidable that the joint becomes a problem and the price becomes high.

[0004] A plasma display has recently appeared and attracted attention as a large-screen display that competes with the liquid crystal display. The plasma display has a simple structure, the fabrication process is short, it is easy to make a large screen, and the development of a phosphor suitable for excitation by ultraviolet light from plasma enables a display with good color reproducibility. It depends on what happened. However, in the case of a plasma display, the luminous efficiency is poor, so that even a 40-inch
A large input of about 00 W is required.
Since the voltage is as high as 300 V, there is a problem that a driving circuit with a high withstand voltage is required. In addition, even if it is a flat display, it is actually about 10 cm thick including the housing, weighs about 40 inches and is tens of kilograms heavy, and special construction is required to use it as a wall-mounted type .

[0005] A light-emitting diode display has been developed in which pixels are formed by combining a recently developed high-luminance and high-efficiency green or blue light-emitting diode with an existing high-efficiency red light-emitting diode. In this case, 1
Since a pixel is composed of three light emitting diodes, about 900,000 light emitting diodes are required even with the number of pixels (480 × 600) of a normal personal computer. Therefore, even if the price of a light emitting diode is reduced to about 10 yen in the future, the cost of the light emitting diode alone will be as high as about 10 million yen, which is not suitable for use in homes and small conference rooms.

[0006] As a device for avoiding the above-mentioned problems of the flat display, a projector device is known. Conventionally, various types of projector devices have been developed depending on the type of light source, spatial light modulator, and optical system for separating and combining three primary colors, and as the spatial light modulator, a transmission type or a reflection type is used. There are various types such as a liquid crystal spatial light modulator and a two-dimensional micro deflection mirror array. In this projector device, it is sufficient that the image display unit has a screen for projecting image light or a white wall. The image display unit can be reduced in weight, and the screen size can be freely changed according to the area of use. There are advantages. In addition, since the image light formed by the spatial light modulator is enlarged and projected several tens times using a projection lens, the spatial light modulator itself is a very small device of 2 to 3 inches as compared with a normal display. It can be said that it is a device that has the possibility of lowering the price.

FIG. 7 shows a conventional projector device using a single two-dimensional micro-deflection mirror array as a spatial light modulator (Projection Displ.).
ayII, P.A. 193, 1996: Proceedin
gs of SPIE, Vol. 2650). The projector apparatus 100 includes a lamp 101 such as a xenon lamp, a halogen lamp, and a metal halide lamp that emits white light, and a parabolic reflector 10 that once collects the output light of the lamp 101 and then reflects the light in a predetermined direction.
2, a cold mirror 104 for removing infrared components from the output light of the light source unit 103, and light from the cold mirror 104 for red, green, blue (R, G, This is abbreviated as B.) A condenser lens 106 for condensing light on the three color filters 105r, 105g, 105b, and the filters 105r, 105g, 1
R, G, B three-color light Lr,
A relay lens 107 that guides Lg and Lb to the mirror 108; and R, G and B from the mirror 108.
A two-dimensional micro-deflection mirror array 109 that deflects the color lights Lr, Lg, and Lb to output R, G, and B color image signal lights 109r, 109g, and 109b, and an image signal light 109r from the two-dimensional micro-deflection mirror array 109 , 10
9g, 109b and R, G,
A total reflection prism 110 for separating the three color lights Lr, Lg, and Lb of B is provided, and a projection lens 111 for projecting image signal lights 109r, 109g, and 109b from the two-dimensional micro deflection mirror array 109 onto a screen (not shown). I have.

In this projector device 100, the output light 103a of the light source unit 103 is
After the infrared component is removed in step (1), the light is condensed by the condenser lens 106 and passes through the filters 105r, 105g, and 105b of the R, G, and B colors of the rotary filter plate 105. The rotation speed of the rotation filter plate 105 is equal to the frame display speed of the image, and is 60 rotations per second. During one rotation, the transmitted light (103
a) is color-separated in a time-division manner into R, G, and B three-color lights Lr, Lg, and Lb by filters 105r, 105g, and 105b, and is returned to a two-dimensional micro-deflection mirror array via a return mirror 108 and a total reflection prism 110. 10
9 is incident. Two-dimensional micro deflection mirror array 109
Are deflected based on the image signals of the respective colors, and are deflected based on the image signals of the respective colors.
r, 109g and 109b. The image signal light 109r, 109g, 109b is
1 is projected on a screen (not shown). By the way, R, G, B filters 105r, 105g, 10
The area ratio of 5b varies slightly depending on the intensity of the R, G, and B lights, but the duration of each of the R, G, and B lights is 5.6 milliseconds on average. The deflection time constant of each micro-deflection mirror in the two-dimensional micro-deflection mirror array 109 is 5 microseconds, which is 1/1000 of the above-described duration. 8
It is possible to give a gradation of bits or more. By using a single two-dimensional micro-deflection mirror array 109 in this manner, it is possible to realize a projector device that has a small number of components, is small in size, and low in cost, and is suitable for a home display device.

[0009]

However, the conventional projector device 100 has the following problems.

(1) Light utilization efficiency is poor. Since a xenon lamp, a halogen lamp, and a metal halide lamp are used as the light source, the life of the light source is short and on / off modulation cannot be performed, so that the light is continuously lit. In addition, since R, G, and B light are modulated in a time-division manner as described above,
The G and B lights are cut by the filters 105r, 105g, and 105b while modulating the other color lights, respectively.
For this reason, the light use efficiency is reduced correspondingly, and is reduced to about 1/3 as compared with the method of individually modulating the R, G, and B lights using three micro deflection mirror arrays. On the other hand, a light source such as a halogen lamp or a xenon lamp used for a projector device is enclosed in a glass bulb several centimeters in size for discharge, and the size of the reflector is limited by the size and cannot be reduced so much. 10-20m
Light collection efficiency is low when shaped into parallel light of m size,
% Or less. Aluminum can be used for the deflecting mirror and the reflectivity is 90%, but the total light utilization efficiency is as small as 10% in consideration of blurring and absorption by other optical systems. In the case of a metal halide lamp, since the light intensity of the spectrum of R color is weak, in order to improve the color balance, the light intensity of the spectrum of other G and B colors must be reduced, and the utilization efficiency is further reduced. descend. A projection light beam of a projector device using a single-plate type micro-deflection mirror array currently being developed has a light source electric input 30.
Even at 0 W, it is at most about 300 lm, and the luminous efficiency is poor.

(2) The power consumption is large and the device becomes large. Since the light use efficiency is low, a high-luminance light source such as a metal halide lamp must be used, which results in a large power consumption of 300 W. As the power supply unit becomes larger, the projector becomes larger. .

(3) The life of the lamp is short, and frequent lamp replacement is required. Xenon lamps, halogen lamps, and metal halide lamps are used as light sources,
Since the life of the light source is short and ON / OFF modulation cannot be performed, continuous lighting is performed, so frequent lamp replacement is required. For example, in the case of a metal halide lamp,
Evaluated by the time required for the center strength to decrease by 50%, 100
0 hours (Journal of the Illuminating Engineering Institute, Vol. 77, No. 12, p.
748, 1993). This is 8 hours / day usage frequency of 4
The service life is about a month, and frequent lamp replacement is required. However, since the lamp surface is hot, there is a risk that the lamp will explode if there is any dirt, and if the lamp is misaligned, there will be problems such as a decrease in light collection efficiency and a decrease in image quality. Lamp replacement is difficult and is being done by a professional technician (eg, 100
If 100,000 lamps were spread, 100,000 lamp replacements would occur per day, requiring more than 10,000 technicians).

(4) Others Light that is not used for display among the light transmitted through the rotary filter plate 105 is absorbed by the filters 105r, 105g, and 105b, and the heat at this time causes the filters 105r and 105b to emit heat.
g, 105b and the inside of the apparatus 100 are heated, which causes problems such as lowering the reliability of the apparatus and requiring an air cooling fan.

[0014] These factors are the major reasons that, besides being expensive, the projector device is not easily spread to homes, small conference rooms and the like.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a projector device with a bright display screen, which improves the light use efficiency. Another object of the present invention is to provide a projector device which can achieve low power consumption and is downsized. It is another object of the present invention to provide a projector device having a longer life of a light source.

[0016]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a plurality of luminous bodies composed of a plurality of semiconductor light emitting elements having different emission colors, and the plurality of semiconductor light emitting elements are sequentially arranged for each of the emission colors. A driving unit that emits a plurality of output lights in time series by emitting light, a shaping optical system that shapes the plurality of output lights emitted from the plurality of light emitters into parallel light, and the shaping optical system. A single spatial light modulating unit that performs spatial modulation according to the image signal corresponding to the emission color on the parallel light and outputs a plurality of image signal lights in time series, and the plurality of spatial light modulating units from the spatial light modulating unit. Provided is a projector device including a projection optical system that projects an image signal light onto a screen.

[0017]

FIG. 1 shows a projector device according to an embodiment of the present invention. This projector device 1
Are the three primary color lights Lr, L of R (red), G (green), and B (blue).
a light emitting element array unit 2 that emits g and Lb in time series;
A shaping optical system 3 for shaping the three primary color lights Lr, Lg, Lb from the light emitting element array section 2 into parallel light, a dichroic mirror 4 for reflecting the three primary color lights Lr, Lg, Lb shaped into parallel light, and a dichroic The three primary color lights Lr, Lg, and Lb reflected by the mirror 4 are subjected to processing (spatial modulation) in which the amount of reflected light changes in accordance with the image signals Sr, Sg, and Sb of each color in a time-series manner, and R, G, and B images are obtained. A spatial light modulator 5 that outputs the signal lights 5r, 5g, and 5b, and a projection that enlarges and projects the R, G, and B image signal lights 5r, 5g, and 5b from the spatial light modulator 5 on a screen 6 in time series. A projection optical system 7 such as a lens, a light emitting element array driver 8 for driving the light emitting element array 2, a spatial light modulator driver 9 for driving the spatial light modulator 5, and R, G, B image signals Sr. , S
The control unit 10 controls the light emitting element array driver 8 and the spatial light modulator driver 9 based on g and Sb.

The light emitting element array section 2 is composed of a plurality of light emitting diode (hereinafter referred to as “LED”) lamps as light emitters, and includes red light Lr, green light Lg and blue light L.
The LED array 20 includes an LED array 20 that emits light b, and a mask 21 disposed on the front surface of the LED array 20.

The shaping optical system 3 is a two-dimensional microlens array 30 for shaping the three primary color lights Lr, Lg, Lb from the light emitting element array section 2 into parallel light, and the three primary color lights shaped by the microlens array 30. A reduction optical device 33 configured by combining a convex lens 31 and a concave lens 32 for reducing Lr, Lg, and Lb in accordance with a pixel range of a two-dimensional micro-deflection mirror array 50 of the spatial light modulator 5 described later. I have. The micro lens array 30
Instead, a homogenizer having a fine uneven surface made of a transparent medium such as glass may be used. in this case,
The incident light from the LED array 20 is scattered by the minute uneven surface, and the minute uneven surface functions as a secondary light source surface,
This scattered light is shaped into parallel light by the reduction optical device 33.

The spatial light modulator 5 applies a two-dimensional micro-deflection mirror array 50 for spatially modulating the three primary color lights Lr, Lg, Lb from the dichroic mirror 4 for each pixel, and enters the two-dimensional micro-deflection mirror array 50. A stopper 51 is provided for receiving the invalid reflected light of the three primary color lights Lr, Lg, Lb of R, G, B.

Next, details of the light emitting element array section 2 and the shaping optical system 3 will be described with reference to FIGS.

FIG. 2A shows the structure of the LED lamp.
FIG. 3B shows the directivity of the output light of the LED lamp.
Shows the relationship between the light emitting element array unit 2 and the shaping optical system 3. The LED lamp 22, as shown in FIG.
350 μm size that emits light of each color of G and B
Corner red LED chip 220R, green LED chip 22
0G and the blue LED chip 220B on the metal substrate 221.
The LED chips 220 are arranged at intervals of 100 μm.
(220R, 220G, 220B) are bonded on the metal substrate 221. Since the G color requires a relatively large amount of light, two green LED chips 220G were used. The LED lamp 22 is covered with a shell-shaped epoxy resin 222 in order to protect the LED chip 220 and increase the light output and the directivity, and energize the LED substrate from below the metal substrate 221. Electrode 22 for
3 is derived. The LED array 20 is arranged as shown in FIG.
As shown in FIG. 3, an LED lamp 22 having a size of 3 mmφ having an output light quantity distribution 22a as shown in FIG.
On the D substrate 23, two-dimensionally 300 (1
5 x 20) pieces, array size is about 60 x 80 mm
The LED chips 220 are wired in series in row units, and the rows are wired in parallel. LED lamp 2
By arranging 2 two-dimensionally, a necessary light flux can be obtained. Further, by setting the aspect ratio of the size of the LED array 20 to be 3: 4 and matching it with the pixel range of the two-dimensional micro deflection mirror array 50, the light use efficiency can be further enhanced. Since the output light of the LED lamp 22 has a strong directivity and a small light emitting area, the light collection efficiency is high.
Further, since the semiconductor light emitting device outputs monochromatic light having a relatively narrow spectrum width of several tens nm or less, the color combining efficiency is increased.

As shown in FIG. 3, the mask 21 is configured such that the peripheral portion of the output light 22a of each LED lamp 22 is cut by the opening 21a, and only the central output light 22b is transmitted. .

As shown in FIG. 3, the micro lens array 30 has a plurality of square micro lenses 30a so as to coincide with the optical axis of each LED lamp 22 of the LED array 20.
Are arrayed two-dimensionally without any gap, and the focal length of each microlens 30a is determined by the LED array 20 and the microlens array 3.
0 is substantially equal to the distance D ₁ of the said. Also, the numerical aperture W of each micro lens 30a of the micro lens array 30
Corresponds to the spread angle (about 30 degrees) θ of the output light 22b at the center of the LED lamp 22. By this, LED
The output light 22b of the lamp 22 becomes a parallel light 30b having a substantially uniform light intensity distribution.

FIG. 4 shows details of the reduction optical device 33. The reduction optics 33 reduces the parallel light 30b from each micro lens 30a of the micro lens array 30 by the convex lens 31 and the concave lens 32, and makes the parallel light 33a incident on the two-dimensional micro deflection mirror array 50 via the dichroic mirror 4. It has become. Reduction optics 33
Is a value slightly smaller than the ratio of the size of the two-dimensional micro deflection mirror array 50 to the size of the LED array 20 (for example, 0.13 / 1). Accordingly, the two-dimensional micro-deflection mirror array 50 can be irradiated with the parallel light 30b from the microlens array 30 as the parallel light 33a again almost uniformly.

FIG. 5 shows details of the spatial light modulator 5. 2
The two-dimensional micro deflection mirror array 50 is configured by arranging a plurality of square micro deflection mirrors 52 of about 16 μm on a semiconductor substrate 53 by a pivot 54 in a two-dimensional array. Here, the number of pixels (number of mirrors) 48
A pixel having a size of 0 × 640 dots and a pixel range of about 7.7 × 10.2 mm is used. Each of the micro-polarizing mirrors 52 deflects based on an electrostatic force generated when a transistor (not shown) formed in an array on the semiconductor substrate 53 is turned on by driving of the spatial light modulator driver 9, and is deflected by the LED array 20. When the three primary color lights Lr, Lg, Lb are used as the effective reflected light, the micro deflecting mirror 52 is arranged in the state shown by the solid line in FIG. 5 and sequentially reflects the three primary color lights Lr, Lg, Lb to the projection optical system 7. When the reflected light is invalid, the micro deflecting mirror 52 is arranged in a state shown by a broken line in FIG. 5 so that the three primary color lights Lr, Lg, Lb are sequentially reflected to the stopper 51. Each micro-deflection mirror 52 projects the R, G, and B image signals Sr, Sg, and Sb in accordance with the magnitude of the pixel signals constituting the image signals Sr, Sr, and Sb by driving the spatial light modulator driver 9 under the control of the controller 10. The reflection time (4.5 milliseconds at the maximum and 17.6 microseconds at the minimum) to the optical system 7 is controlled, and the amount of reflected light changes at 256 gradations (8 bits).

FIG. 6A shows the operation timing of each part of the device 1, FIG. 6B shows the dependency of the applicable current of the LED chip 220 on the pulse duty ratio, and FIG.
4 shows output characteristics with respect to an input current of the LED chip 220. As shown in FIG. 1A, the control unit 10 controls R, G, B
, The red LED chip 220R, the green LED chip 220G, and the blue LED chip 220B have a predetermined duty ratio (about 1/3) in one frame in synchronization with the input timing. ), The lighting control for the light emitting element array driver 8 is performed so as to light up in time series, and the light quantity control for the spatial light modulator driver 9 is performed so that the two-dimensional micro-deflection mirror array 50 deflects in time series. Is what you do. This light amount control enables multi-tone (full color) image display. Further, the control unit 10 controls the light emitting element array unit driver 8 so as to turn off the LED chip 220 during the horizontal and vertical blanking periods in the two-dimensional micro deflection mirror array 50.

As is clear from FIG. 6B, the applicable current can be increased 2.5 times by reducing the duty ratio from 100% (continuous input (CW)) to about 1/3. , The output can also be increased by a factor of three or more in proportion. This is because the applied current and the output of the LED chip 220 are mainly limited by the amount of heat generated, so that the applicable current can be increased in inverse proportion to the lighting time, and the output can be increased in proportion to this. This is because the number can be increased as described above.

As is clear from FIG. 6 (c), the output with respect to the input current shows a tendency to saturate with an increase in the input current in the case of CW (broken line), while the output in the case of pulse input (duty). (30% ratio), it increases in proportion to the input current up to 60 mA. The rated current value of the LED chip 220 is C
In the case of W, it is about 20 mA. Therefore, the duty ratio is 3
By lowering it to about 0%, the output can be increased more than three times. In other words, it can be seen that even if the R, G, and B lights are divided in time series, the total output can be equal to or greater than that of the case of CW. Further, by turning off all the LED chips 220 during the horizontal and vertical blanking periods of the image frame, the pulsed light output can be further increased. NT
In the case of the SC signal, the blanking period is 20% of the entire period. During this period, since all the LED chips 220 can be turned off, the respective LED chips 220R, 220G, 22
The duty ratio of OB is reduced to 27%, and as a result, the pulse electric input can be increased to about 3 times and the output can be increased to about 3.5 times in the case of CW, and the light use efficiency can be further enhanced.

Next, the operation of the projector 1 according to the first embodiment having the above configuration will be described. The control unit 10
The light emitting element array driver 8 is controlled in synchronization with the image signals Sr, Sg, Sb of each color, and the red LED chip 220R, the green LED chip 220G, and the blue LED chip 220B of the LED array 20 are lit in time series. That is, as shown in FIG. 6 (a), when the R image signal Sr is input, the control unit 10 controls the red LE of the LED array 20.
When the D chip 220R is turned on and the G image signal Sg is input, the green LED chip 220G is turned on. When the B image signal Sb is input, the blue LED chip 220 is turned on.
B is turned on. Red light L emitted by the LED array 20
r, the green light Lg and the blue light Lb are cut into the parallel light by the microlenses 30 a constituting the microlens array 30 of the shaping optical system 3 after the peripheral portions are cut by the mask 21, and are reduced by the reduction optical device 33. The light is reflected by the dichroic mirror 4,
, Respectively.

On the other hand, the control unit 10 controls the image signal S of each color.
The spatial light modulator driver 9 is controlled in synchronization with r, Sg, and Sb, and the two-dimensional micro-deflection mirror array 50 of the spatial light modulator 5 converts the three color lights Lr, Lg, and Lb of R, G, and B into a time series. Spatial modulation. That is, the LED array 20
When the three primary color lights Lr, Lg, and Lb are used as the effective reflected light, the control unit 10 receives the R image signal Sr and outputs the red light Lr in accordance with the pixel signal constituting the image signal Sr. The spatial modulation in which the amount of reflected light changes is performed for each pixel by the two-dimensional micro deflection mirror array 50, and the G image signal Sg
Is input to the two-dimensional micro-deflection mirror array 50, the green light Lg undergoes spatial modulation in which the amount of reflected light changes in accordance with the pixel signal forming the image signal Sg, and the B image signal Sb is input. Then, the image signal S is added to the blue light Lb.
Spatial modulation in which the amount of reflected light changes in accordance with the pixel signal forming b is performed by the two-dimensional micro deflection mirror array 50 for each pixel. At this time, the two-dimensional micro deflection mirror array 5
0 is the three primary color lights Lr, Lg, L from the LED array 20
When b is the effective reflected light, the three primary color lights Lr, Lg, L
When b is reflected to the projection optical system 7 and becomes invalid reflection light,
The three primary color lights Lr, Lg, Lb are reflected by the stopper 51. R, G, B image signal light 5 spatially modulated as effective reflected light by the two-dimensional micro deflection mirror array 50
r, 5g and 5b are projected onto the screen 6 by the projection optical system 7.
The projection is enlarged. In this way, a full-color image is displayed on the screen 6 on a large screen.

Next, the effect of the projector 1 according to the first embodiment will be described. (B) The light use efficiency is improved, and a bright display screen is obtained.
Since light sources for each of the colors R, G, and B are used, color separation becomes unnecessary, and light loss during color separation can be avoided.
Further, since the light can be collected with good directivity, the projection efficiency of the projection optical system 7 can be increased to 85% or more. As a result, this device 1
Is 90% in the light emitting element array section 2 and the shaping optical system 3, the reflectance of the two-dimensional micro deflection mirror array 50 is 90%, and the light transmission efficiency in the projection optical system 7 is 85%.
%, The overall light use efficiency is about 70%, which is about seven times higher than the conventional one. Also, the R, G, B LED chips 22
Wavelength, chromaticity coordinates of output light of 0R, 220G, 220B,
And the pulsed light output are respectively 650 nm: (0.
7, 0.28): 1.2 lm, 520 nm: (0.1
7, 0.7): 5 lm, 450 nm: (0.13, 0.
075): 1 lm, the chromaticity coordinates of the synthesized white light are (0.34, 0.35), which is almost standard white, and all L
The ED lamp 22 provided a brightness of about 720 lm, and the image signal lights 5r, 5g, and 5b as projection light fluxes had a brightness of 500 lm.

(B) Low power consumption can be achieved and downsizing can be achieved. The power consumption per LED chip (220) is 120 mW, 165 mW, 21 R, G and B respectively.
0 mW (current is 60 mA each), each LED chip 220
By setting the lighting duty ratio of R, 220G, and 220B to 27%, the total power consumption is 30 W or less, which is 1/1 of the conventional power consumption.
It became 0. The operating voltage per LED chip (220) is 2 to 3.6 V. In order to suppress the operating voltage and current of the LED array 20 to easy-to-handle values (<100 V, <1 A), the LEDs in the LED array 20 are controlled. Since the chips 220 are wired in series in row units and each row is wired in parallel, the operating voltage and current of the LED chip 220 are 40 to 80 V and 0.5 A, respectively. In addition, each LED chip 220 was turned off during the period of horizontal blanking (about 13% in NTSC signal) and vertical blanking (8%). As a result, about 20% of the power and the amount of heat generation are reduced, and the total power consumption of the LED array 20 can be further reduced. Further, since a single LED array 20 and a single spatial light modulator are used, the size of the projector device can be reduced.

(C) The life of the light source can be extended. The life of the LED lamp 22, which is a light source, is 10,000 hours or more, which is 10 times or more that of a halogen lamp or the like. Therefore, the life of the light source can be greatly extended, and the usage frequency of about 8 hours / day lasts nearly 4 years. Become usable.

(D) Cost can be reduced. LED lamp 2
2 is 10 to several tens of yen / piece, and the LED array 20
A few thousand yen to 10,000 yen in total and a slightly more conventional light source (thousands of yen)
However, considering that no lamp replacement is required, that the power consumption is 1/10 and that safety is considered, even if the cost of the light source is one order of magnitude higher, it is sufficient. .

In the above embodiment, a single two-dimensional micro-deflection mirror array is used as the spatial light modulator. However, a reflective or transmissive spatial light modulator using ferroelectric liquid crystal is used. Needless to say, the same effect can be obtained. Also, in a reflection type or transmission type spatial light modulator using a nematic liquid crystal or a dispersion type liquid crystal, since the modulation speed is as slow as several tens of milliseconds, the image flickers, but the same effect can be obtained. . In the above embodiment, the light emitting element array that emits the output light of R, G, and B is used, but two of these colors or the other two are used.
A combination of colors or more may be used. When two colors of output light are used, the image signal light may be displayed in time series with two colors and a mixed color thereof.

[0037]

As described above, according to the present invention, since the output light of the light source has directivity, the light use efficiency can be greatly improved, and a bright display screen can be obtained. Further, since a semiconductor light emitting element having high luminous efficiency is used as the light source, low power consumption can be achieved. Since the light use efficiency is increased and power consumption is reduced, the life of the light source can be extended. Furthermore, since a single light-emitting body array and a single spatial light modulator are used, the size can be reduced. As a result, it can be spread to homes, small meeting rooms, and the like.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a projector device according to an embodiment of the present invention.

FIG. 2A is a configuration diagram of an LED lamp according to the present embodiment, and FIG. 2B is a diagram illustrating directivity of output light thereof.

FIG. 3 is a diagram illustrating a relationship between a light emitting element array unit and a shaping optical system according to the present embodiment.

FIG. 4 is a diagram showing details of a reduction optical device according to the present embodiment.

FIG. 5 is a diagram showing details of a spatial light modulator according to the present embodiment.

FIG. 6 (a) is a diagram showing the operation timing of each unit of the present apparatus,
(b) is a diagram showing the dependency of the applicable current of the LED chip on the pulse duty ratio, and (c) is a diagram showing the output characteristics of the LED chip with respect to the input current.

FIG. 7 is a configuration diagram of a conventional projector device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Projector apparatus 2 Light emitting element array part 3 Shaping optical system 4 Dichroic mirror 5 Spatial light modulation part 5r, 5g, 5b Image signal light 6 Screen 7 Projection optical system 8 Light emitting element array part driver 9 Spatial light modulation part driver 10 Control part 20 LED array 21 Mask 21a Opening 22 LED lamp 22a Light intensity distribution 22b Output light 23 Substrate 30 Micro lens array 30a Micro lens 30b, 33a Parallel light 31 Convex lens 32 Concave lens 33 Reduction optical device 50 Two-dimensional micro deflection mirror array 51 Stopper 52 Micro deflection Mirror 53 Semiconductor substrate 54 Pivot 220R Red LED chip 220G Green LED chip 220B Blue LED chip 221 Metal substrate 222 Epoxy resin 223 Electrode D ₁ distance Lr Red light Lg Green light Lb Blue light Sr, Sg, Sb Image signal W Numerical aperture θ Spread angle

Claims (11)

[Claims] 1. A plurality of luminous bodies comprising a plurality of semiconductor light emitting elements having different emission colors, and a drive for sequentially emitting the plurality of semiconductor light emitting elements for each emission color and emitting a plurality of output lights in time series. Means, a shaping optical system that shapes the plurality of output lights emitted from the plurality of light emitters into parallel light, and a space corresponding to the parallel light from the shaping optical system according to an image signal corresponding to the emission color. A single spatial light modulator that modulates and outputs a plurality of image signal lights in time series; and a projection optical system that projects the plurality of image signal lights from the spatial light modulator on a screen. A projector device characterized by the above-mentioned. 2. The projector device according to claim 1, wherein said illuminant has a configuration in which said luminescent colors are composed of said three semiconductor elements of red, green and blue. 3. The projector according to claim 1, wherein said plurality of light emitters are arranged one-dimensionally or two-dimensionally. 4. The semiconductor light emitting device according to claim 1, wherein
2. The projector device according to claim 1, wherein the projector device is configured by a chip. 5. A structure in which the plurality of semiconductor light-emitting elements of the plurality of light-emitting bodies arranged two-dimensionally are turned off during horizontal and vertical blanking periods of the spatial modulation in the spatial light modulator. 3. The projector device according to 3. 6. The plurality of light emitters arranged two-dimensionally,
4. The projector according to claim 3, wherein the aspect ratio is substantially equal to the aspect ratio of a screen projected on the screen. 7. The plurality of semiconductor light-emitting elements of the plurality of light-emitting bodies arranged two-dimensionally are connected in series in row units,
4. The projector device according to claim 3, wherein each row is connected in parallel. 8. The projector according to claim 1, wherein the shaping optical system shapes the output lights of the plurality of light emitters into the parallel light having a uniform light intensity distribution. 9. The shaping optical system is disposed on a front surface of the plurality of light emitters so as to face the plurality of light emitters, and converts the plurality of output lights emitted from the plurality of light emitters into the parallel light. The projector device according to claim 1, wherein the projector device is configured by a plurality of micro lenses that shape the image. 10. The projector according to claim 1, wherein the shaping optical system enlarges or reduces the plurality of output lights emitted from the plurality of light emitters by two lenses to form the parallel light. apparatus. 11. The projector apparatus according to claim 1, wherein said spatial light modulator comprises a transmission type or reflection type liquid crystal spatial light modulator or a two-dimensional light deflection mirror array.