JP2001051651A - Light source device and control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a light source device capable of coloring a color picture including even white color and using compact semiconductor light emitting elements. SOLUTION: Lighting times per a cycle of semiconductor light sources 6, 7, 8 in which LEDs are used and which are respective primary colors are made to be changed. Since the difference of the emission intensity of respective semiconductor light sources can be adjusted so that the emission intensity of the light sources become uniform as color stimuli to be sensed by visual sensation, the light source device can be designed by giving priority to factors such as arrangement, cost over the balance of the emission intensity of a semiconductor light source and, thus, the semiconductor light source compact in size and low in cost is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source device suitable for outputting a color image using a semiconductor light emitting element such as an LED (light emitting diode) as a light source.

[0002]

2. Description of the Related Art As a method for expressing natural colors in a color video output device (called a monitor or a display) using a CRT (cathode ray tube) or a liquid crystal panel, a spatial color mixing method is generally widely used. ing. That is, the light emitting points of the three primary colors R (red), G (green), and B (blue) of light exist as spatially independent pixels, and their intervals are closer than the positional resolution of human vision. Then, human vision can no longer be perceived as each color, but perceived as one mixed color. It is no exaggeration to say that this method is used in almost all dot matrix display devices using CRTs and LED elements (hereinafter referred to as LEDs) as well as almost all conventional liquid crystal panels.

On the other hand, in the field of video projectors, a method in which light rays of three primary colors are constantly projected and mixed on each pixel on a screen, and a time division method in which light rays of three primary colors are temporally divided and sequentially projected. Two methods, a color mixing method, are employed. In this time division color mixing method, red R, green G, and blue B images are sequentially illuminated by blinking within a time shorter than the reaction time of human vision, and this is periodically repeated at a high speed.
In human vision, each color is temporally averaged as an attenuating stimulus, and is recognized as a natural color image including white. The time-division color mixing method is called a single-panel method because only one image processing device (hereinafter, light valve) is required, while the method of illuminating the screen with constantly mixed light beams requires three light valves. Therefore, it is often called a three-plate system. The single-panel type has a simple configuration, is inexpensive, and is suitable for miniaturization. Therefore, with the advent of the DMD (digital micromirror device), it has been adopted in many projectors. In this case, a rotary split color filter called a color wheel has been used for switching the RGB of the projection light.

In recent years, the use of a semiconductor light emitting element such as an LED as a light source of a device for outputting such a color image has been studied. A semiconductor light source using a semiconductor light emitting element has high conversion efficiency to light, and therefore consumes less power and generates less heat. Furthermore, since the lamp has a long life, there is no trouble such as replacing a lamp due to a broken ball, and is maintenance-free. Therefore,
It is considered to be the most suitable light source for future color image output devices.

In a three-panel color image display device, a color image can be displayed by independently and continuously lighting a plurality of LEDs that emit light of each color.
On the other hand, in a single-panel color image display device, a light source device that sequentially emits three types of LEDs of red R, green G, and blue B and irradiates one light valve is required. . The LED is suitable for a single-plate system because it can be turned on at a high speed.

[0006]

In any type of color video output device, when the luminous flux of each color obtained from the LED of each color is modulated to the same extent, an achromatic color from white to black can be obtained. Then, in order to obtain a luminous flux of an intensity (light quantity and / or luminance) necessary for displaying a color image, a plurality of LEDs are used as a light source of one color.
Is needed. For this reason, the semiconductor light source of each color
In consideration of the light emission intensity of the LEDs, the number of LEDs is selected such that a light beam having an equal luminous intensity is obtained for each color. At this time, since the color sensation of a human is not proportional to the intensity of the stimulus of each of the R, G, and B colors, it is necessary to determine the number of LEDs so that a natural white color can be displayed in consideration of the correction.

[0007] For example, in the conventional light source device 9, as shown in FIG. 7, a difference in light emission intensity of each color LED is mainly considered. For example, 43 red R LED elements 6 and green G LED elements 7 are used. , And 23 blue LED elements 8 are used. When these are simultaneously lit or lit for the same time within one cycle, achromatic colors including white can be expressed. Furthermore, by displaying these for different times by the light valve, all natural colors can be displayed. Can be displayed.

At present, the emission intensity of the red R LED is lower than that of the LEDs of other colors, and the luminosity is lower than that of the green G. Therefore, when a light source device that can express natural colors including white using the LED as a light source is designed, the size of the entire light source device is determined by the number of primary color LEDs (red LEDs) that require the largest number. There is a problem that the light source device is almost entirely determined, and as a result, the size of the light source device is increased as a whole. That is, as in the light source device 9 shown in FIG. 7, an area for disposing the required number of red LEDs 7 is required. Since the collimator lens 3 for converting the light beams, the dichroic prism 5 for synthesizing the light beams of each color, and the exit are determined, the size of the light source device is small even if the number of LEDs necessary for obtaining the light beams of other colors is small. It is hard to be. Therefore, the light emitted from the light source device 9 is transmitted to the light valve 5.
The projector 1 that modulates and projects the data also becomes large.

Therefore, in the present invention, in a light source device using a semiconductor light emitting element whose light emission amount is unbalanced for each color as a light source as described above, the semiconductor of each color necessary for displaying natural white is used. An object is to provide a light source device capable of equalizing the number of light emitting elements and a control method thereof. Further, it is an object of the present invention to provide a compact light source device capable of sufficiently obtaining the intensity of emitted light and expressing natural white. Still another object of the present invention is to provide a compact and beautiful color image output device such as a projector by employing the light source device of the present invention.

[0010]

For this reason, in the present invention, in a light source device which emits semiconductor light sources of each color in a time-division manner, the lighting time of each color is made variable. In the conventional light source device, the lighting time ratio of each color is the same, that is, in the case of three primary colors, the lighting time of red R, green G and blue B is 1: 1: 1. Therefore, in the present invention, by changing the lighting time for each color in consideration of factors such as the intensity of the semiconductor light source of each color and the color stimulus, the color stimulus perceived by human eyes can be balanced by the human eyes. The light source device is controlled so as to be uniform, and the light source device can be optimized in consideration of the size and cost.

That is, a light source device according to the present invention is a light source device having a plurality of semiconductor light emitting elements and capable of outputting white light by sequentially lighting a plurality of types of semiconductor light sources that emit different single primary color lights. The total lighting time during which a plurality of types of semiconductor light sources are lit within one cycle is different depending on the color, that is, the type of the semiconductor light source. In the method for controlling a light source device capable of outputting white light by sequentially lighting a plurality of types of semiconductor light sources that emit monochromatic lights of different colors according to the present invention, the plurality of types of semiconductor light sources are turned on within one cycle. The total lighting time is changed by color, that is, by the type of semiconductor light source. The total lighting time may be changed for each color, or only the lighting time of some colors may be changed to the lighting time of another color.

In order to control the total lighting time, a method of changing one lighting time of one type of semiconductor light source during one cycle and a method of changing the number of times of lighting of one type of semiconductor light source within one cycle are described. There are ways to change it. One or more LEDs or SLDs (superluminescent diodes, super radiant light emitting diodes)
Semiconductor light-emitting elements such as red R, green G, and blue B
It is desirable to emit monochromatic light of the three primary colors. further,
It may emit monochromatic light of an intermediate color in addition to these three primary colors.

[0013] By changing the lighting time of the semiconductor light source of each color within one cycle which is a cycle for expressing one color, the amount of visual stimulus when the light of that color is captured by the eye is adjusted. It is possible to Therefore, even if the intensities of the semiconductor light sources of the respective colors are different, a substantial balance of the intensities can be achieved by changing the lighting time within one cycle, so that the mixed color can be felt as white. For example, when the same number of red, green, and blue LEDs are prepared, even if the luminous intensity of the red and green LEDs is weaker than that of the blue LED, the lighting time of the red and green LEDs is reduced by the lighting of the blue LED. If the time is set longer than the time, the contribution of red and green increases, so that white can be expressed.

Therefore, in the light source device and the method of controlling the same according to the present invention, the relative intensity of the semiconductor light source of each color is adjusted by changing the lighting time of each color, which is conventionally equal, according to the color. The degree of freedom increases. Therefore, by adjusting the number of the semiconductor elements constituting the semiconductor light source and the lighting time thereof, it is possible to select an optimal combination for minimizing the size of the light source device.

There is a method in which light emitted from the semiconductor light source is filtered to reduce the intensity to balance the light. However, it is not preferable because light emitted from the semiconductor light source is lost. On the other hand, when the lighting time is controlled as in the present invention, energy loss is small. further,
The semiconductor light source has good responsiveness, can accurately control the lighting time, and can be controlled by a simple circuit, and can easily adjust the lighting timing and the lighting time.
In addition, even if the semiconductor light source is repeatedly turned on and off, the conversion efficiency does not decrease, so that the loss is small. Therefore, the control method of the present invention for controlling the lighting time of each color light is based on the LED.
Most suitable for a light source device using a semiconductor light source such as

In the color image output device employing the light source device of the present invention, the time for obtaining light of each color is different. Therefore, the synchronizing means for controlling the image of the light valve in synchronization with the lighting time of the semiconductor light source for each color. Alternatively, a synchronization step is required. Further, since the lighting times are different, a data conversion means or a data conversion step for generating gradation data based on the entire lighting time during which the semiconductor light source for each color is lit within one cycle is required. In other words, for colors with long lighting times,
It is necessary to increase the time for turning on and off the dots of the light valve in order to express each gradation, and for colors with a short lighting time, it is necessary to shorten the time for turning on and off the dots of the light valve in order to express each gradation. is there.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration of a light source device according to the present invention and a projector using the same. The light source device 10 of the present embodiment is a semiconductor light source device using an LED, which is one of the semiconductor light emitting elements, as a light source.
And a semiconductor light source 8 composed of an LED emitting a blue B light beam. In the light source device 10 of this example, a plurality of LEDs are arranged as semiconductor light sources that emit the red R, green G, and blue B light fluxes. However, unlike the light source device 9 shown in FIG. Approximately the same number of LEDs are arranged every time. The luminous flux emitted from each of the semiconductor light sources 6, 7 and 8 is condensed via the microlens 2, and further collimated (condenser lens) 3
After being converted into a parallel light beam by the light source 10, the light is guided to the dichroic prism 4 and emitted from the light source device 10.

In the projector 20 of this embodiment using the light source device 10, the light emitted from the light source device 10 is guided to one liquid crystal light valve 5 common to the three primary color light beams. The light modulated by the light valve 5 for each color is projected on a screen by a projection lens (projection lens or lens system) 21. As described above, the projector 1 of the present example is the single-panel projector described above, and light of three primary colors, that is, red R and green G
A light beam of blue and blue B is radiated to the light valve 5 in a time sharing manner to express multi-color.

Therefore, the light source device 10 of the present embodiment includes a power supply circuit (power supply device, power supply means) 11 for periodically supplying power to the semiconductor light sources 6, 7, and 8 of each color and lighting them. Have. 2 and 3 show timings at which power is cyclically supplied from the power supply circuit 11 of this embodiment to semiconductor light sources of respective colors (indicated by R, G and B in the drawings). FIG. 4 shows the timing of supplying power to the semiconductor light sources of each color in the conventional light source device.

As shown in FIG. 4, conventionally, power is supplied to semiconductor light sources R, G, and B of each color at equal intervals, and 1
The semiconductor light sources R, G and B of each color within the period T0
Were lit at equal intervals. Therefore, among the three primary colors of light, the number of red R LEDs with the lowest luminous efficiency and emission intensity is required most, and the number of green G LEDs is increased next. The number of strong blue B LEDs was the smallest. In contrast,
In the light source device 10 of the present embodiment, first, in the example shown in FIG. 2, the semiconductor light sources 6 (R), 7 (G) and 8
The power supply time in (B) is changed so that one lighting time within T0 for one cycle is different. For example, the ratio of the length of one lighting time of the semiconductor light sources R, G and B of each color is defined as red R: green G: blue B = 1.9: 1.
7: 1. By changing the lighting time of the semiconductor light source of each color in this way, in this example, the semiconductor light sources 6, 7, and 8 of each color can be constituted by an equal number, for example, 23 LEDs. The semiconductor light sources 6, 7, and 8 using these LEDs are cyclically turned on at the timing shown in FIG.
It is possible to express white color having a necessary and sufficient color tone.

That is, in the so-called single-panel type projector 20 having one image processing element (light valve) such as DMD or liquid crystal (LCD), the primary colors of red R, green G and blue B are simultaneously lit. Instead, only one primary color is lit at each moment. By repeating the lighting of red R, green G, and blue B at a cycle faster than the response speed of the human eye, the human brain expresses multi-color by using the perception of these as a mixed color. ing.

For this reason, when there is a difference in light emission intensity between the red R, green G, and blue B light sources, as shown in FIG. 2, the number of LEDs constituting the semiconductor light source of each primary color becomes the most. The LED constituting the blue B semiconductor light source 8 which can be reduced
Of the light source device 10 (one cycle T
If the lighting time of red R and green G is set longer than that of blue B in 0), even if the required number of red R and green G LED elements is reduced, the semiconductor light sources 6, 7, and 8 of each color can be used. Substantial intensity that affects the visual perception of the subject can be balanced.

The timing chart shown in FIG. 3 shows that the semiconductor light sources 6, 7, and 8 of each color do not change a single lighting time, but change the number of times of lighting within one cycle T0 to change T0 for one cycle. This is an example in which the total lighting time in can be adjusted by a semiconductor light source. For example, when the semiconductor light sources 6 and 7 for red R and green G are turned on twice each during one cycle T0, and the semiconductor light source 8 for blue B is turned on only once, an average is obtained at T0 for one cycle. FIG.
The semiconductor light sources of the respective colors can be turned on at a ratio close to the ratio of the total lighting time shown in FIG. By narrowing the pulse width for supplying power from the power supply circuit 11 to the semiconductor light sources 6, 7, and 8 of each color and increasing the number of times of lighting in one cycle T0, the ratio of the total lighting time can be set more finely.

On the other hand, by keeping the pulse width constant,
If the ratio of the total lighting time of the semiconductor light source of each color cannot be adjusted only by the lighting time, the colors can be balanced by slightly adjusting the number of LEDs constituting the semiconductor light source of each color. Instead of adjusting the color balance in one cycle, it is also possible to adjust a delicate color balance based on the result of summing the lighting times over a plurality of cycles. However, when the adjustment is performed over a plurality of cycles, color flicker may occur. Further, as described later, the gradation data is used to control each pixel of the light valve 5 in accordance with each color light beam. The conversion process becomes complicated.

In either case shown in FIG. 2 or FIG. 3, in the light source device 10 of the present embodiment, the duty for supplying power to the semiconductor light sources 6, 7, and 8 of each color can be set differently for each color. And T for one cycle
At 0, the total lighting time during which the semiconductor light source of each color lights up can be adjusted for each color. Therefore, the number of LEDs constituting the semiconductor light sources 6, 7, and 8 of each color can be set to the same or almost the same value so as to express all colors including white. Therefore, it is possible to make the area for disposing the LEDs almost the same for each color,
In particular, the number of red R and green G LEDs can be reduced. For this reason, the light source device 10 can be made compact. Further, since the light beams having substantially the same cross-sectional area can be obtained from the semiconductor light sources 6, 7 and 8 of each color, it is possible to select a light source in which the size of the collimator lens 3 or the dichroic prism 4 is balanced for all the light beams of each color. Can be designed compactly. Therefore, the light source device 10 as a whole is well-balanced, and a configuration and arrangement without waste can be selected, so that the size of the entire device can be made compact.

In the light source device 10 of the present embodiment, the lighting time of the semiconductor light source of each color can be adjusted. Therefore, the lighting time of a semiconductor light source with a small amount of light or a semiconductor light source with a small color stimulus can be extended. The amount of light can be substantially increased. Therefore, according to the present invention, it is possible to provide a semiconductor light source device that is compact, can secure a sufficient amount of light, and can obtain emission light with a well-balanced color or easily balanced color when displaying a color image.

From the light source device 10 having different lighting time or lighting timing for each color, light of each color is emitted at each timing and lighting time. Therefore, in order to project a color image using the light source device 10, it is necessary to generate an image of each color in accordance with the timing and time at which light of each color is emitted to the light valve 5 of the projector 20. For this reason, in the projector 20 of the present example, a synchronous circuit (a signal for generating an image of each color to the light valve 5 in accordance with the timing at which the semiconductor light sources 6, 7 and 8 of each color of the light source device 10 are turned on). (Synchronizing means or synchronizing device) 22.

Further, the gradation data supplied from a personal computer or the like is data of 256 or 1024 gradations, and if a projector using a conventional light source device, these gradation data can be distinguished without distinction of colors. The timing is changed to the timing of turning on / off each pixel of the light valve by the same processing. However, in the light source device 10 of the present example, the lighting time or the lighting frequency differs for each color. Therefore, in the projector 20 of this example, a data conversion circuit (data conversion means or device) 23 is provided to convert the gradation data into a signal for turning on / off each pixel of the light valve 5 in accordance with the lighting time or timing of each color. Converting. Such data conversion processing can be performed at an appropriate timing, and the converted data can be stored in a memory such as a RAM in advance. Of course, image data converted according to the timing of the light source device 10 may be sent from a personal computer.

In the projector 20 of this embodiment, the size of the built-in light source device 10 can be reduced as described above, so that the size of the projector itself can be reduced. Therefore, by generating an image in the light valve 5 in accordance with the timing and the lighting time of the luminous flux of each color supplied from the light source device 10, a beautiful bright image including the white color is displayed on the screen by the compact projector. can do.

Since the light source device 10 uses an LED which is a semiconductor light emitting element, the conversion efficiency into light is high.
Fever is small. Therefore, as compared with a halogen wrap or the like, it is possible to reduce a space, a fan, and electric power consumed for cooling the light source device 10. Also, since it is a semiconductor light source, it has a long life,
There is no worry about breaking the ball. Therefore, no maintenance is required. Furthermore, since the change of the light emission amount with time is small, it is bright,
The advantages of the semiconductor light source described above can be fully utilized, for example, a stable image can be obtained.

FIGS. 5 and 6 show the outline of the control of the light source device 10 and the projector 20 of the present embodiment. As shown in FIG. 5, when the light source device 10 is turned on in step 51, the red R
The semiconductor light source 6 is turned on for a time T1 and then, in step 53, the green G semiconductor light source 7 is turned on for a time T2. Subsequently, in step 54, the blue B semiconductor light source 8 is turned on for the time T3, and the process returns to step 51 to turn on these semiconductor light sources in turn every cycle until turned off. Then, in the light source device 10 of the present embodiment, the time T for turning on each semiconductor light source is T.
Since 1, T2 and T3 can be changed, the difference between the intensities of the respective semiconductor light sources can be adjusted by the lighting time as described above. When changing the number of times of lighting within one cycle, the respective lighting times T1, T2 and T3
, And the semiconductor light source having insufficient intensity may be repeatedly turned on within the same period. Of course, it is also possible to control both the lighting time and the lighting frequency.

On the other hand, in the projector 20, in step 61, the gradation data is converted in accordance with the lighting time of the semiconductor light source of each color. Then, in step 62,
The converted data is supplied to the light valve 5 in synchronization with the timing of the luminous flux of each color emitted from the light source device 10,
An image is formed for each color. The process of changing the gradation data may be performed when the image data of the color is supplied to the light valve 5, or it is also possible to generate converted data in advance and record it in the memory. Further, the conversion process may be performed by a dedicated circuit using a gate array, or may be processed by software.

As described above, the light source device 1 of the present embodiment
At 0, L is the same as or close to each of the three primary colors.
A light source device can be configured using an ED, and light beams of the respective colors that are time-divided can be combined to emit a white high-intensity light beam. Therefore, a white light source device using a simple and compact LED can be obtained. Furthermore, in the light source device 10 of the present embodiment, since the amount of light emission can be adjusted by the lighting time, when the price of the LED element varies greatly depending on the emission color, the LED element of each emission color is used to realize an inexpensive light source. Can be determined not by a ratio based on the normal light amount but by cost. Therefore, the technique of the present invention is effective even when the cost of the light source is reduced. That is, in the light source device of the present invention, it is possible to design the light source device in consideration of factors such as arrangement and cost, not balance of light intensity of the semiconductor light source of each color, and to provide a compact and low-cost semiconductor light source. can do.

In the above description, LE is used as the semiconductor light emitting element.
Although an example using D has been described, it is a matter of course that the present invention is not limited to this. Although a semiconductor laser may be used,
It becomes expensive in terms of cost. On the other hand, when the SLD is employed, the degree of integration of the light source device can be increased, and the light quantity and luminance of the emitted light can be further improved. In addition, the light beams emitted from each semiconductor light source are guided in the same emission direction via a dichroic prism, but this optical path can be configured using a dichroic mirror or other optical elements. It is.

The light source device 10 of this embodiment uses semiconductor light sources of three primary colors of red R, green G and blue B, but emits a light beam of an intermediate color in order to further clear the display of the intermediate color. A semiconductor light source may be added. And
The balance of white when adding the intermediate color light beam can be obtained by adjusting the lighting time of each color light beam.

Further, in the above description, a projector employing an LCD as a light valve has been described as an example of a color image output device to which the light source device 10 of this embodiment is applied.
Other types of light valves, such as DMD, can be employed. In particular, since the response time of the DMD is several steps faster than that of the LCD, the DMD is suitable for displaying a color image in combination with the light source device 10 of the present example, which is different in the time or timing of irradiating each color light in one cycle. .

Further, the light source device 10 of the present embodiment can be applied to a device for irradiating a color image on a photographic paper or the like to perform printing. Further, the light source device of this embodiment can be applied to a backlight of a liquid crystal monitor. In this case, since the backlight emits light of each color, a color filter is not required, and multicolor can be expressed by one pixel. Therefore, it is possible to provide a display with higher resolution and beautiful colors.

[0038]

As described above, the light source device of the present invention is a light source device using a semiconductor light source having a semiconductor light emitting element such as an LED, and the semiconductor light source of each primary color is turned on within one cycle. By changing the period of time, even if there is a difference between the light emission intensities of the semiconductor light sources of the respective primary colors, it is possible to make adjustments so that the color stimuli felt visually are uniform. Therefore, even if there is a difference between the light emission intensities of the semiconductor light sources, it is possible to balance the substantial intensities and emit a light beam capable of displaying white. Therefore, it is not necessary to adjust the number of semiconductor light emitting elements such as LEDs constituting the semiconductor light source of each primary color so that the light emission intensity matches the semiconductor light sources of the other primary colors. Therefore, a white light source using a semiconductor light emitting element can be flexibly used according to the purpose, such as making the light source device compact by making the number of the semiconductor light emitting elements the same, or selecting the number of the semiconductor light emitting elements by giving priority to cost. Be able to design. For this reason, it is possible to provide a semiconductor light source which is compact, low-cost, and is suitable as a light source for expressing multicolors including white.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a light source device and a projector according to the present invention.

FIG. 2 is a diagram showing a timing of turning on a semiconductor light source of each color of the light source device shown in FIG. 1;

FIG. 3 is a diagram illustrating a state in which semiconductor light sources of respective colors are turned on at a different timing from FIG. 2;

FIG. 4 is a diagram showing a timing of turning on a semiconductor light source of each color in a conventional light source device.

FIG. 5 is a flowchart showing control of the light source device shown in FIG.

6 is a flowchart showing a process of supplying data to a light valve in the control of the projector shown in FIG.

FIG. 7 is a diagram illustrating an example of a conventional light source device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 20 Projector 2 Micro lens 3 Collimator lens 4 Dichroic prism 5 Light valve 6 Semiconductor light source consisting of red R LED 7 Semiconductor light source consisting of green G LED 8 Semiconductor light source consisting of blue B LED 9, 10 Light source device 11 Power Supply circuit 21 Projection lens 22 Synchronization circuit 23 Data conversion circuit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Fumitaka Murayama, 3-6-8 Akabane, Okaya, Nagano Prefecture Inside Sai Park Co., Ltd. (72) Inventor Hideo Hara 4529 Hunan, Oaza, Suwa-shi, Nagano Nitto Kogaku Co., Ltd. EE30 FF09 GG09 JJ02 JJ04 JJ07 5C094 AA08 AA15 AA44 AA45 AA56 BA12 BA23 BA43 BA97 DA01 DB05 EB02 ED01 ED15 GA10 5F041 BB33 DC07 EE11 EE25 FF16 5G435 AA04 AA17 AA18 BB04 BB12 BB04 BB12 BB04 BB04

Claims (9)

[Claims] 1. A light source device comprising a plurality of semiconductor light-emitting elements and sequentially outputting a plurality of types of semiconductor light sources emitting monochromatic light of different colors to output white light, wherein the plurality of types of semiconductor light sources are provided. Is a light source device in which the total lighting time during which light is turned on within one cycle varies depending on the color. 2. The light source device according to claim 1, wherein each of the plurality of types of semiconductor light sources has a different lighting time during one cycle. 3. The light source device according to claim 1, wherein the plurality of types of semiconductor light sources have different numbers of lighting times within one cycle. 4. The light source device according to claim 1, wherein said plurality of types of semiconductor light sources are LEDs or SLDs, and emit monochromatic light of red R, green G, and blue B. 5. A control method for a light source device comprising a plurality of semiconductor light emitting elements, and capable of outputting white light by sequentially lighting a plurality of types of semiconductor light sources emitting monochromatic light of different colors,
A method of controlling a light source device, wherein a total lighting time during which the plurality of types of semiconductor light sources are lit within one cycle is changed according to a color. 6. The method according to claim 5, wherein one lighting time during which the plurality of types of semiconductor light sources are lit within one cycle is changed according to the type of the semiconductor light source. 7. The method according to claim 5, wherein the number of times that the plurality of types of semiconductor light sources are turned on within one cycle is changed according to the type of the semiconductor light source. 8. A color image output apparatus comprising: the light source device according to claim 1; and a light valve that modulates light emitted from the light source device and displays an image for each color. A synchronization unit that controls an image of the light valve in synchronization with a lighting time of the semiconductor light source, and a data conversion unit that generates gradation data based on a total lighting time of lighting within one cycle of the semiconductor light source for each color. And a color image output device. 9. A method for controlling a color image output device, comprising: the light source device according to claim 1; and a light valve that modulates light emitted from the light source device to display an image for each color. A synchronization step of controlling an image of the light valve in synchronization with a lighting time of the semiconductor light source for each color; and data for generating gradation data based on a total lighting time in one cycle of the semiconductor light source for each color. A control method for a color image output device having a conversion step.