JP6733351B2 - Light source device, projection device, light source control method, and program - Google Patents

Description

The present invention relates to a light source device, a projection device, a light source control method, and a program suitable for a projector or the like that uses a semiconductor light emitting element array as a light source.

Even if a short-circuit fault occurs in any of the multiple light sources, it is possible to identify the short-circuit faulty light source, stop the current supply to the specified light source, and then identify the light source so as to be able to provide appropriate brightness. There has been proposed a technique of controlling so as to supply a current according to the number of other light sources that have not been provided. (For example, Patent Document 1)

JP, 2005-0795966, A

The technique described in the above patent document is proposed for a circuit for individually switching-controlling and driving a plurality of semiconductor light sources connected in parallel.

Generally, when a plurality of LEDs (light emitting diodes) in a broad sense including a semiconductor light emitting element, such as an LD (laser diode, semiconductor laser) are connected and lighted at the same time, they should be connected in series as much as possible, and a constant current should be applied by a resistor or an active element. It is necessary to set the controlled circuit as one unit and connect the unit circuits in parallel to the power supply.

In this type of light source device, the rate of occurrence of COD (Catastrophical Optical Damage) is increasing with the recent increase in output. When a similar load drive state is maintained in a state where COD is generated, that is, in a state in which a current is flowing in a part of the elements connected in series but no light is emitted, the element is eventually completely destroyed. It becomes an open state, and all the light emitting elements connected in series are turned off.

In addition, the COD is a general term for a state in which a current is flowing but no light is emitted, and it has been found that an accurate coping method differs depending on the degree of damage.

In a projection device using this type of light source device, if all of the plurality of light emitting elements that are driven to emit light at the same time do not light up, it is impossible to project a color image of the correct color component, so the projection operation must be stopped. Becomes

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to improve the contents of a plurality of light emitting elements that are driven to emit light at the same time when an element that is in a non-lighting state appears. It is to provide a light source device, a projection device, a light source control method, and a program that can be dealt with accordingly.

According to an aspect of the present invention, a plurality of light emitting elements that are driven to emit light at the same time, and an optical damage and a type of a part of the plurality of light emitting elements when the plurality of light emitting elements are driven are described. The plurality of light emitting elements are detected based on whether the detection unit detects the driving voltage and the temperature change of the plurality of light emitting elements and the type of optical damage detected by the detection unit is a short state, a heat generation state, or an open state. characterized in that it comprises a power control unit for controlling the driving current to the element.

According to the present invention, among a plurality of light emitting elements that are driven to emit light at the same time, when an element that is in a non-lighting state appears, it is possible to deal with it according to its content.

FIG. 1 is a block diagram showing a schematic functional configuration of a projector device according to an embodiment of the present invention. FIG. 3 is a diagram illustrating a configuration of an optical system according to the same embodiment. FIG. 3 is a perspective view showing an external configuration of an LD array that emits blue light according to the same embodiment. 6 is a flowchart showing the processing contents of the first operation example according to the embodiment. The flowchart which shows the processing content of the 2nd operation example which concerns on the same embodiment.

An embodiment in which the present invention is applied to a DLP (registered trademark) (Digital Light Processing) type projector device will be described below with reference to the drawings.

[Constitution]
FIG. 1 is a diagram showing a schematic functional configuration of a projector device 10 according to the present embodiment. The input unit 11 includes, for example, an HDMI (registered trademark) (High-Definition Multimedia Interface) terminal, a pin jack (RCA) type video input terminal, a D-sub 15 type RGB input terminal, and the like. The image signals of various standards input to the input unit 11 are sent to the image conversion unit 12 via the bus B after being digitized by the input unit 11 as necessary.

The image conversion unit 12, also called a scaler, unifies the input image data into image data of a predetermined format suitable for projection by the projector device 10, and sends the image data to the projection processing unit 13.

The projection processing unit 13 multiplies the frame rate according to a predetermined format, for example, 60 [frames/second], the number of divisions of color components, and the number of display gradations according to the sent image data The micromirror element 14 is driven to display by various time division driving.

The micro-mirror element 14 individually turns on/off each tilt angle of a plurality of micro mirrors arranged in an array, for example, WXGA (Wide eExtended Graphic Array) (1280 pixels wide×800 pixels vertical). By displaying an image by using the reflected light, an optical image can be formed by the reflected light.

On the other hand, light of a plurality of colors including primary color lights of R, G, and B are sequentially emitted in a time division manner from the light source unit 15 in a time division manner. The light from the light source unit 15 is totally reflected by the mirror 16 and is applied to the micromirror element 14.
Then, an optical image is formed by the reflected light from the micromirror element 14, and the formed optical image is projected and displayed on a screen (not shown) as a projection target via the projection lens unit 17.

A temperature sensor 18 is attached to a plurality of LD (laser diode/semiconductor laser) arrays that are simultaneously driven to emit light in the light source unit 15, and the temperature detection result is sent to a CPU 20 described later via the bus B. It

Further, an illuminance sensor 19 is arranged in the optical system path in order to detect the light emission amount of the light source light output from the light source unit 15, and the illuminance detection result is sent to the CPU 20 described later via the bus B. ..

It should be noted that the projection processing unit 13 executes control such as power adjustment to each light emitting element in the light source unit 15 described later under the control of the CPU 20. The projection processing unit 13 under the control of the CPU 20 performs power adjustment and the like according to the drive state of the light emitting element in the light source unit 15.
The projection processing unit 13, the micro mirror element 14, the light source unit 15, the mirror 16, the projection lens unit 17, the temperature sensor 18, and the illuminance sensor 19 constitute a projection system PS.

The CPU 20 controls all operations of the above circuits. The CPU 20 is directly connected to the main memory 21 and the program memory 22. The main memory 21 is composed of, for example, an SRAM, and functions as a work memory for the CPU 20. The program memory 22 is composed of an electrically rewritable non-volatile memory and stores an operation program executed by the CPU 20 and various standard data. The CPU 20 uses the main memory 21 and the program memory 22 to execute the control operation in the projector device 10.

The CPU 20 executes various projection operations according to key operation signals from the operation unit 23.
The operation unit 23 includes a key operation unit provided in the main body of the projector device 10 and an infrared light receiving unit that receives infrared light from a remote controller (not shown) dedicated to the projector device 10, and is operated by the user. A key operation signal based on a key operated by the key operation unit or the remote controller is directly output to the CPU 20.

The CPU 20 is also connected to the audio processing unit 24 via the bus B. The audio processing unit 24 includes a sound source circuit such as a PCM sound source, converts the audio data given during the projection operation into an analog signal, drives the speaker unit 25 to emit a loud sound, or generates a beep sound or the like as necessary.

The configuration of the optical system when the light source unit 15 is configured by using two types of semiconductor light emitting elements will be described with reference to FIG.
The light source unit 15 has an LD array 31, which is a semiconductor light emitting element that emits blue laser light, as a first semiconductor light emitting element.
As shown in FIG. 3, in this LD array 31, a total of 8 LDs of 4×2 (vertical direction in FIG. 2) are arranged in an array, and a total of 8 LDs are connected in series to drive light emission. To be done. The drive current of each LD forming the LD array 31 is controlled by the projection processing unit 13.

The temperature sensor 18 is arranged substantially at the center of the rear surface side of the LD array 31, which is different from the light emitting surface, and detects the amount of heat generated by the LD array 31.

The blue (B) laser light emitted by the LD array 31 is reflected at a 90° angle by a mirror array 32 arranged in a stepwise manner so as to face the LD array 31, and is condensed by the lenses 33 and 34 to be parallel. After being made into a luminous flux, it is transmitted through the dichroic mirror 35, and is irradiated onto the peripheral surface of the color wheel 38 as a part of the light source through the lenses 36 and 37.

The color wheel 38 is rotated by the drive of a motor (M) 39 that is a rotation driving unit, and divides a region into a diffusion plate for transmission (color filter) 38b and a phosphor layer (color filter) 38g on the peripheral surface. Are arranged.

At the peripheral surface position of the color wheel 38 where the phosphor layer 38g is located, a phosphor is applied to the surface irradiated with the laser light from the LD array 31 to form a phosphor layer, and the phosphor layer 38g is formed. A reflection plate is provided on the back surface of the surface where the reflection plate overlaps with the phosphor layer.

When the phosphor layer 38g of the color wheel 38 is on the optical path of the laser light from the LD array 31, the phosphor layer 38g is excited by the irradiation of the blue laser light and emits green light.

The green light (G) emitted from the color wheel 38 is uniformly guided to the lenses 36 and 37 by the reflection plate formed on the back surface side of the phosphor layer 38g, and reflected by the dichroic mirror 35.

The green light reflected by the dichroic mirror 35 is reflected by the dichroic mirror 42 via the lens 41, then passes through the lens 43, passes through the integrator 44, and becomes a luminous flux having a uniform luminance distribution. The green light emitted from the integrator 44 is further reflected by the mirror 46 via the lens 45, is reflected by the mirror 16 via the lens 47, and is then applied to the micromirror element 14 via the lens 48.

The illuminance sensor 19 is provided on the back surface side of the mirror 46 to detect a slight amount of leaked light that is not reflected by the mirror 46.

An optical image is formed by the reflected light from the micromirror element 14 in the direction of the projection lens unit 17, and the optical image is not shown as an object to be projected by the projection lens unit 17 via the lens 48. The screen etc. is irradiated.

Further, when the transmission diffusion plate 38b of the color wheel 38 is on the optical path of the laser light from the LD array 31, the blue light (B) diffused and transmitted through the diffusion plate 38b passes through the lens 50. After being reflected by the mirror 51 through the lens 52, further reflected by the mirror 53 through the lens 52, the light beam is transmitted through the dichroic mirror 42, passes through the lens 43, passes through the integrator 44, and becomes a luminous flux having a uniform luminance distribution. The blue light emitted from the integrator 44 is further reflected by the mirror 46 via the lens 45 and reaches the mirror 16 via the lens 47.

Further, the light source unit 15 has an LED (light emitting diode) 55, which is a semiconductor light emitting element that emits red light, as a second semiconductor light emitting element. The drive current of the LED 55 is also controlled by the projection processing unit 13.
The red light emitted by the LED 55 is transmitted through the dichroic mirror 35 through the lenses 56 and 57, is reflected by the dichroic mirror 42 through the lens 41, and then passes through the lens 43 and the integrator 44 to be radiated. The light flux has a uniform distribution. The red light emitted from the integrator 44 is further reflected by the mirror 46 via the lens 45 and reaches the mirror 16 via the lens 47.

[motion]
Next, the operation of the above embodiment will be described.
In the present embodiment, the individual LDs forming the LD array 31 that emits blue light have a larger thermal load including the array structure than the LED 55 that emits red light. It is assumed that there is a high possibility of COD (hereinafter referred to as "optical damage").

In the above-mentioned optical damage state, the element maintains conduction and does not prevent lighting of other LDs connected in series, but the LD itself that has been optically damaged becomes unlit. In this state of optical damage, it can be roughly classified into a “short mode” which should be also called a static optical damage type and a “heat generation mode” which should also be called a dynamic optical damage type.

Hereinafter, the occurrence of optical damage by type will be expressed as either a “short mode” or a “heat generation mode”.

The LD in the short mode does not become a resistance, consumes almost no electric power, and does not generate heat in a state where it does not emit light, but the existence of the LD in the short mode reduces the driving voltage of the entire LD array 31.

On the other hand, the LD in the heat generation mode becomes a resistance in a state where it does not emit light and consumes electric power that is not converted to a light output as heat, but the existence of the LD in the heat generation mode drives the entire LD array 31. The voltage does not change.

(First operation example)
When the LD array 31 continues to be lit in the same manner as in the steady state from the state where the optical damage occurs in either the short mode or the heat generation mode, the design of each LD forming the LD array 31 should be designed with some margin. In the LD array 31 that has not been subjected to the optical damage, the LD that has suffered optical damage is disconnected and remains open in a short time, and the LD array 31 connected in series is turned off.

FIG. 4 is a flowchart for extracting and showing the first processing content for dealing with optical damage, which is executed for the LD array 31 in the light source unit 15 under the control of the CPU 20.
Here, the LD array 31 and the LEDs 55 of the light source unit 15 which are driven in a time division manner will be described by excluding the concept of drive timing in order to simplify the description. However, originally, a plurality of fields that form an image frame, For example, in the case of projecting an image only in the RGB primary color fields, the LED 55 is driven in the R (red image) field, and the LD array 31 is driven in the G (green image) field and the B (blue image) field in time division. To be done.

Therefore, FIG. 4 shows the processing executed by the CPU 20 for the LD array 31 in the G (green image) field and the B (blue image) field.

At the beginning of the process, the CPU 20 detects the light emission amount of the LD array 31 based on the detection output of the illuminance sensor 19 (step S101), and determines whether the LD forming the LD array 31 has the LD depending on whether or not the light emission amount is decreased. It is determined whether optical damage has occurred (step S102).

Here, if it is determined that the light emission amount has not decreased and the LD forming the LD array 31 has not been optically damaged (No in step S102), the CPU 20 returns to the processing from step S101.

By repeatedly executing the processing of steps S101 and S102 in this way, the CPU 20 constantly monitors whether or not optical damage has occurred, in accordance with the light emission timing of the LD array 31.

When it is determined in step S102 that the amount of light emission has decreased and the LDs forming the LD array 31 are optically damaged (Yes in step S102), the CPU 20 causes the projection processing unit 13 to perform the light source operation. The drive voltage of the LD array 31 is detected in the unit 15 (step S103).

It is determined whether the optical damage occurs in the short mode depending on whether the detected drive voltage of the LD array 31 is lower than a preset threshold value (step S104).

If the drive voltage of the LD array 31 is lower than the threshold value and it is determined that the optical damage is occurring in the short mode (Yes in step S104), the CPU 20 causes the projection processing unit 13 to use the light source unit 15 and the LD array 31 to operate. The drive current is controlled so as to be reduced to a current value A1 which is smaller than the drive current in the state where the normal optical damage does not occur (step S105).
This is because the amount of heat generated by each LD in the LD array 31 is larger in the heat generation mode than in the short mode, so the brightness of other LDs that do not cause optical damage is darker than in the short mode. is there. Therefore, the current value A2 in the heat generation mode is larger than the current value A1 in the short mode.

If it is determined in step S104 that the drive voltage of the LD array 31 is not lower than the threshold value and the optical damage has not occurred in the short mode (No in step S104), the optical damage has occurred in the heat generation mode. Therefore, the CPU 20 causes the projection processing unit 13 to cause the light source unit 15 to drive the LD array 31 up to a current value A2 (A2>A1) which is smaller than the normal drive current but not smaller than the current value A1. The control is performed so as to decrease (step S106).

After performing the current value setting in one of the steps S105 and S106, the CPU 20 warns that the LD array 31 is optically damaged, for example, on the image for driving the micromirror element 14 to be displayed and driven by the projection processing unit 13. The OSD (on-screen display) projection to be superimposed as a message is executed to notify the user of the projector apparatus 10 (step S107), and the series of processing in FIG. 4 is completed.

The detection of the amount of light emission using the illuminance sensor 19 and the monitoring of the drive voltage of the LD array 31 are included in the routines that are usually executed in the general projection control, and particularly for detecting the optical damage of the LD array 31. Since it is not specially prepared, it can be carried out without increasing the circuit equipment.

Further, in the operation of FIG. 4 described above, when the occurrence of optical damage is detected, the drive current is reduced according to the mode, so that the LD causing the optical damage is completely destroyed and becomes the open state. The risk of stopping the light emission of the light emitting element can be reduced.

When the drive current of the LD array 31 is reduced when the occurrence of the optical damage is detected, the drive current of the LED 55 that emits a high red color of the light source unit 15 is also reduced so as to have a corresponding light emission amount. Therefore, it is necessary to adjust the color balance of the projected color image.
In the first operation example, when the light emission amount of the LD array 31 is detected by the detection output of the illuminance sensor 19 (step S101) and it is determined that the LD is optically damaged (Yes in step S102). ), the drive voltage of the LD array 31 is detected (step S103), and it is determined whether the optical damage occurs in the short mode (step S104), but the steps are not limited to this order.
First, the drive voltage of the LD array 31 is detected (step S103), it is determined whether or not the optical damage is generated in the short mode (step S104), and it is determined that the drive voltage is not the short mode below the threshold value. Even in such a case (No in step S104), next, by detecting the light emission amount of the LD array 31 from the detection output of the illuminance sensor 19 (step S101), it is determined whether or not the LD is in the heat generation mode. It can be determined (step S102).

(Second operation example)
When the lighting of the LD array 31 is continued from the state in which the optical damage has occurred in the short mode or the heat generation mode in the same manner as in the steady state, there is a margin in advance in the design degree of each LD forming the LD array 31. In the designed LD array 31, it is conceivable that another LD that emits light instead of the LD that has caused optical damage may be used to supplement the light emission amount.

FIG. 5 is a flowchart for extracting and showing the second processing content for dealing with optical damage, which is executed for the LD array 31 in the light source section 15 under the control of the CPU 20.
Here, the LD array 31 and the LEDs 55 of the light source unit 15 which are driven in a time division manner will be described by excluding the concept of drive timing in order to simplify the description. However, originally, a plurality of fields that form an image frame, For example, in the case of projecting an image only in the RGB primary color fields, the LED 55 is driven in the R (red image) field, and the LD array 31 is driven in the G (green image) field and the B (blue image) field in time division. To be done.

Therefore, FIG. 5 shows the processing executed by the CPU 20 for the LD array 31 in the G (green image) field and the B (blue image) field.

At the beginning of the process, the CPU 20 causes the projection processing unit 13 to detect the drive voltage of the LD array 31 in the light source unit 15 (step S201).

It is determined whether or not the optical damage in the short mode has occurred depending on whether or not the detected drive voltage of the LD array 31 is lower than a preset threshold value (step S202).

When it is determined that the drive voltage of the LD array 31 is not lower than the threshold value and at least the optical damage in the short mode does not occur (No in step S202), the CPU 20 causes the temperature sensor 18 to detect the temperature of the LD array 31. Is detected (step S203).

By comparing the temperature of the LD array 31 detected here with a preset threshold value, whether or not the temperature clearly rises as compared with the time of the steady projection operation, that is, whether or not the optical damage in the heat generation mode has occurred. It is determined whether or not (step S204).

Here, when it is determined that the temperature of the LD array 31 has not particularly risen as compared with the steady projection operation and the optical damage in the heat generation mode has not occurred (No in step S204), the CPU 20 causes the above step S201. Return to processing from.

In this way, the processes of steps S201 to S204 are repeatedly executed, and the process waits until optical damage is detected in either the short mode or the heat generation mode.

When it is determined in step S202 that the drive voltage of the LD array 31 is lower than the threshold value and the optical damage in the short mode has occurred (Yes in step S202), the CPU 20 causes the projection processing unit 13 to use the light source unit 15, The drive current of the LD array 31 is controlled so as to be increased to a current value A3 larger than the drive current in a state where normal optical damage does not occur (step S205).

Further, when it is determined in step S204 that the temperature of the LD array 31 is significantly higher than that in the steady projection operation and the optical damage in the heat generation mode occurs (Yes in step S204), the CPU 20 determines The projection processing unit 13 controls the light source unit 15 so as to increase the drive current of the LD array 31 to a current value A4 that is larger than the drive current in a state in which optical damage does not occur normally and that is larger than the current value A3. (Step S206).
In the heat generation mode, the heat generation amount of each LD of the LD array 31 is larger than that in the short mode, and thus the brightness of the other LDs in which optical damage does not occur is darker than that in the short mode. Therefore, the current value A4 in the heat generation mode is set to be larger than the current value A3 in the short mode.

After performing the current value setting in one of the steps S205 and S206, the CPU 20 warns that the LD array 31 is optically damaged, for example, on the image for displaying and driving the micromirror element 14 by the projection processing unit 13. The OSD (on-screen display) projection to be superimposed as a message is executed to notify the user of the projector apparatus 10 (step S207), and the series of processing in FIG. 5 is completed.

Since it is possible to directly judge the occurrence of optical damage in the heating mode by detecting the temperature rise of the LD array 31 by the temperature sensor 18 and the occurrence of optical damage in the short mode by detecting the decrease of the driving voltage of the LD array 31, Actions depending on the mode of damage can be started more quickly.

In addition, in the second operation example, the LD array 31 is driven with a relatively large margin in terms of the rated power of the LD array 31 during the normal projection operation, and when the optical damage is judged to be due to a bridge or the like, the mode is changed according to the mode. By increasing the current and increasing the amount of light emitted by the other LD that has not caused optical damage, the decrease in the amount of light emitted by the LD that has caused optical damage is compensated for, and the amount of light emitted by one of the LEDs 55 does not change. The control is performed so that the color balance of the projected color image is not lost.

In each of the first and second operation examples described above, the case has been described in which the control for increasing/decreasing the increase/decrease amount of the drive current value is performed according to the mode of optical damage. In addition to this, however, the occurrence of optical damage is determined. From a high current/high duty projection mode, for example, by limiting its use in projection modes that prioritize high brightness and sacrifice color reproducibility for use in presentations, thereby preventing optical damage. It is possible to reduce the risk that the element that has caused the occurrence of the color image becomes even more open and projection of the color image becomes impossible.

If the occurrence of optical damage is confirmed, the operation of the complementary color period in the color mixing by simultaneous lighting with the light emitting element of another color such as using the light emitting element that has caused the optical damage is limited to The projection operation may be limited to the above, and the risk that the element in which the optical damage has occurred becomes the open state and the projection of the color image becomes impossible as described above can be reduced.

[effect]
As described above in detail, according to the present embodiment, it is possible to deal with a case where an element that is in a non-lighting state appears among a plurality of light emitting elements that are driven to emit light in accordance with the content.

Further, in the above-described embodiment, when optical damage occurs in the LD that constitutes the LD array 31, the amount of drive current to be reduced or increased is made different according to the type (mode) thereof, so that the amount of light emission is accurate. By controlling, it is possible to reduce the quality of the projected image as small as possible.

Although the above embodiment has been described for the case of being applied to the projector device of the DLP (registered trademark) system, the present invention is not limited to the projection device, the system thereof, and the like, and a plurality of light emitting elements are driven to emit light at the same time. Any light source device can be similarly applied.

Besides, the present invention is not limited to the above-described embodiment, and can be variously modified at the stage of implementation without departing from the spirit of the invention. Further, the functions executed in the above-described embodiments may be combined as appropriate as much as possible. The above-described embodiment includes various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, if the effect can be obtained, a structure in which the constituent elements are deleted can be extracted as an invention.

The inventions described in the initial claims of the present application will be additionally described below.
[Claim 1]
A plurality of light emitting elements that are driven to emit light at the same time,
When driving the plurality of light emitting elements, a detection unit for detecting the optical damage and the type of some of the light emitting elements of the plurality of light emitting elements,
Based on the type of optical damage detected by the detection unit, a power control unit for controlling the power supply to the plurality of light emitting elements,
A light source device comprising:
[Claim 2]
The light source device according to claim 1, wherein the detection unit detects the optical damage and its type from the drive power and the light emission amount of the plurality of light emitting elements.
[Claim 3]
The light source device according to claim 1, wherein the detection unit detects the optical damage and its type from the driving power and the temperature change of the plurality of light emitting elements.
[Claim 4]
4. The light source device according to claim 1, wherein the power control unit controls an increase/decrease amount of supply current to the plurality of light emitting elements based on a type of optical damage detected by the detection unit. ..
[Claim 5]
A light source device according to any one of claims 1 to 4,
A projection unit that forms a light image using the light supplied from the light source device, irradiates the projection target to form an image, and
A projection device comprising:
[Claim 6]
A method for controlling a light source in a device having a plurality of light-emitting elements driven to emit light at the same time,
When driving the plurality of light emitting elements, a detection step of detecting optical damage and a type of a part of the plurality of light emitting elements,
Based on the type of optical damage detected in the detection step, a power control step of controlling the power supply to the plurality of light emitting elements,
A light source control method comprising:
[Claim 7]
It is a program executed by a computer incorporated in a device having a plurality of light emitting elements driven to emit light at the same time.
A detector that detects optical damage and a type of a part of the plurality of light emitting elements when the plurality of light emitting elements are driven, and
Based on the type of optical damage detected by the detection unit, a power control unit that controls the power supplied to the plurality of light emitting elements,
A program characterized by making it function as.

10... Projector device,
11... Input section,
12... Image conversion unit,
13... Projection processing unit,
14... Micromirror element,
15... Light source part,
16...Mirror,
17... Projection lens part,
18...Temperature sensor,
19... Illuminance sensor,
20... CPU,
21... Main memory,
22... Program memory,
23... operation part,
24... voice processing unit,
25... speaker section,
31... LD array,
32... Mirror array,
35... dichroic mirror,
38... Color wheel,
38b... a diffusion plate for transmission,
38 g... Phosphor layer,
39... Motor (M),
42... dichroic mirror,
44...integrator,
46...Mirror,
B...bus,
PS... Projection system.

Claims (5)

A plurality of light emitting elements that are driven to emit light at the same time,
When driving the plurality of light emitting elements, the optical damage and the type of a part of the light emitting elements of the plurality of light emitting elements, a detection unit for detecting from the drive voltage and temperature change of the plurality of light emitting elements ,
Types of optical damage detected by the detecting unit, shorted, heat generation state, on the basis of whether the open state, the power control unit for controlling the drive current to the plurality of light emitting elements,
A light source device comprising: It said power control unit, the basis of the type of optical damage detected by the detection unit, the plurality of claim 1 Symbol placement of the light source device and controls the amount of increase or decrease the supply current to the light emitting element. A light source device according to claim 1 or 2 ,
A projection unit that forms a light image using the light supplied from the light source device, irradiates the projection target to form an image, and
A projection device comprising: A method for controlling a light source in a device having a plurality of light emitting elements driven to emit light at the same time,
When driving the plurality of light emitting elements, a detection step of detecting the optical damage and the type of some of the light emitting elements of the plurality of light emitting elements from the driving voltage and the temperature change of the plurality of light emitting elements ,
The detecting step types of optical damage detected in the short state, heat generation state, on the basis of whether the open state, the power control step of controlling the drive current to the plurality of light emitting elements,
A light source control method comprising: It is a program executed by a computer incorporated in a device having a plurality of light emitting elements driven to emit light at the same time.
When driving the plurality of light emitting elements, the optical damage and the type of some of the light emitting elements of the plurality of light emitting elements, a detection unit for detecting from the drive voltage and temperature change of the plurality of light emitting elements , The type of optical damage detected by the detection unit, a power control unit for controlling the drive current to the plurality of light emitting elements based on which of the short state, the heat generation state and the open state ,
A program characterized by making it function as.