JP5999788B2 - Projector and detection method - Google Patents

Description

The present invention relates to a projector that detects a replacement timing for replacing a light source.

  A projector used for watching a movie or giving a presentation usually includes a discharge lamp such as a high-pressure mercury lamp, a metal halide lamp, or a halogen lamp as a light source.

  The above lamps are suitable for projector light sources that require a certain level of brightness because of their high brightness, but on the other hand, the longer the lighting time, the lower the brightness and the projected image can be viewed. There are problems such as difficulty in lightning and facilitation of light loss and rupture. For this reason, in a projector equipped with a lamp, it is necessary to replace the lamp at an appropriate timing.

  Specifically, as the lighting time for lighting the lamp becomes longer, the electrodes of the lamp are worn and the distance between the electrodes becomes wider. Since the lamp is driven at a constant power, the wider the gap between the electrodes, the higher the voltage between the electrodes. When the voltage reaches an allowable value, the lamp is likely to be lost or burst. The voltage between the electrodes changes according to the lighting power supplied to the lamp. However, if the lamp electrode continues to wear, the voltage between the electrodes reaches an allowable value when the rated power is supplied to the lamp. In general, the lamp lighting time until the lamp brightness reaches 50% of the initial brightness is equal to or shorter than the lamp lighting time until the voltage between the lamp electrodes reaches an allowable value. For this reason, the lamp lighting time until the lamp brightness reaches 50% of the initial brightness is defined as the lifetime, and the lamp is replaced when the lamp lighting time reaches the lifetime.

  On the other hand, Patent Document 1 discloses a projection apparatus that notifies that the lamp lighting time has reached the end of its life. This projection device calculates the lamp wear level based on the lamp turn-on time, and notifies that the lamp turn-on time has reached the end of its life when the wear degree exceeds a certain value. As a result, the user can grasp the replacement timing for replacing the lamp.

  Patent Document 2 discloses a light source device capable of extending the life of a lamp. In this light source device, as a lighting mode for lighting a lamp, a rated voltage is supplied to the lamp, a steady lighting mode for lighting the lamp, and an eco lighting mode for lighting the lamp by supplying power lower than the rated voltage to the lamp. With.

  As the lighting voltage supplied to the lamp is smaller, the lamp electrodes are less likely to be worn out, so the life of the lamp becomes longer. For this reason, when the lamp is lit in the eco lighting mode, the life of the lamp becomes longer than when the lamp is lit in the steady lighting mode. Therefore, the life of the lamp can be extended by selecting an appropriate lighting mode according to ambient brightness and the like.

JP-A-8-106128 JP 2008-293934 A

  As in the technique disclosed in Patent Document 2, when there are a plurality of lighting modes having different lighting powers supplied to the lamp, the degree of wear of the lamp electrode changes depending on the lighting mode. The relationship between time and wear level also changes. In this case, even if the wear level is calculated according to the lighting time as in the technique described in Patent Document 1, the calculated wear level is deviated from the actual wear level, and the lamp lighting time reaches the lifetime. It is not possible to accurately determine whether or not

SUMMARY An advantage of some aspects of the invention is that it provides a projector and a detection method capable of accurately grasping a replacement timing for replacing a lamp.

A projector according to the present invention includes a light source,
A light source driving unit that supplies lighting power to the light source and lights the light source;
A lighting control unit for adjusting the lighting power;
A calculation unit that measures a lighting time when the light source is turned on and calculates a degree of wear of the light source according to a corrected lighting time obtained by correcting the lighting time, which is obtained based on the lighting time and the lighting power ; Have
The calculation unit corrects the lighting time according to the lighting power, and the minimum power lighting in the lighting mode for supplying the minimum lighting power among the plurality of lighting modes for supplying different lighting power to the light source. It is determined according to time, and the corrected lighting time is obtained using the determined correction formula.

A detection method according to the present invention is a detection method for detecting a replacement timing of a light source of a projector,
Adjust the lighting power to be supplied to the light source,
Measure the lighting time when the light source is turned on,
A correction formula for calculating the degree of wear of the light source according to the corrected lighting time obtained by correcting the lighting time , which is obtained based on the lighting time and the lighting power, and correcting the lighting time according to the lighting power. , A plurality of lighting modes for supplying different lighting power to the light source, determined according to the minimum power lighting time in the lighting mode for supplying the minimum lighting power, and using the determined correction formula, the corrected lighting time Ask for .

  According to the present invention, it is possible to accurately notify the light source replacement timing.

It is a block diagram which has the structure of the projector of one Embodiment of this invention. It is a figure which shows the relationship between the lighting time of a lamp | ramp, and a brightness | luminance. It is a figure for demonstrating the problem of related technology. It is a figure which shows an example of the relationship of the lamp lighting time and lamp remaining amount in related technology. It is a figure which shows the reference example of the relationship between the lighting time of a lamp | ramp in a related technique, and a lamp remaining amount. It is a figure which shows an example of the relationship of the lighting time of a lamp | ramp and lamp remaining amount in one Embodiment of this invention. It is a flowchart for demonstrating the operation example of the projector of one Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In the following description, components having the same function may be denoted by the same reference numerals and description thereof may be omitted.

  FIG. 1 is a block diagram having a configuration of a projector according to an embodiment of the present invention. In FIG. 1, the projector includes a lamp 1, a projection unit 2, a lamp driving unit 3, a lighting control unit 4, a nonvolatile memory 5, a calculation unit 6, and a display unit 7.

  The lamp 1 is a light source that generates light.

  The projection unit 2 displays the image corresponding to the video signal on the screen by modulating the light generated by the lamp 1 according to the video signal and projecting it on a screen (not shown).

  The lamp driving unit 3 is a light source driving unit that supplies lighting power to the lamp 1 to light the lamp 1. Specifically, the lamp driving unit sets one of a plurality of lighting modes with different lighting power supplied to the lamp 1 and supplies the lighting voltage corresponding to the set lighting mode to the lamp 1. The lamp 1 is turned on.

  In the present embodiment, the lighting modes include a steady lighting mode for supplying predetermined rated power to the lamp 1 and an eco lighting mode for supplying eco power smaller than the rated power to the lamp 1. However, the eco lighting mode in which eco power smaller than the rated power is supplied to the lamp 1 is not limited to one, and there may be a plurality of modes.

  The lighting control unit 4 adjusts the lighting power supplied to the lamp 1 by the lamp driving unit 3. Specifically, the lighting control unit 4 adjusts the lighting power supplied to the lamp 1 by selecting one of a plurality of lighting modes and setting the selected lighting mode in the lamp driving unit 3. For example, the projector is provided with a switch (not shown) for selecting a lighting mode, and the lighting control unit 4 receives a selection signal for selecting one of a plurality of lighting modes from the switch, and the selection is performed. The lighting mode selected according to the signal is set in the lamp driving unit 3.

  The nonvolatile memory 5 stores lamp remaining amount information indicating the remaining amount of lamp, which is the remaining time during which the lamp 1 can be lit, as the degree of wear of the lamp 1. In the present embodiment, the remaining lamp information indicates the ratio of the remaining time at the present time to the remaining time at the time when the use of the lamp 1 is started as the remaining lamp power. In this case, the time when the lamp remaining amount becomes 0% is the replacement timing for replacing the lamp 1.

  The nonvolatile memory 5 stores the lamp lighting time for each lighting mode. However, when the lighting power in each lighting mode is close, in order to reduce the amount of memory, the lighting time of the lamp may be managed with a plurality of lighting modes corresponding to the adjacent lighting power as one group. . When the lighting power is close, the lifetime can be set to be substantially the same.

  The calculation unit 6 measures the lighting time when the lamp 1 is turned on. Then, the calculation unit 6 obtains a corrected lighting time by correcting the lighting time based on the lighting time and the lighting power supplied to the lamp 1, and the lamp 1 is consumed according to the corrected lighting time. Calculate the degree. When the degree of wear of the lamp 1 reaches a predetermined value, the calculation unit 6 determines that it is time to replace the lamp, and displays timing notification information indicating that the replacement time is reached on the display unit 7. The user is notified that the replacement timing has come.

  In the present embodiment, the calculation unit 6 calculates the remaining amount of the lamp as the degree of wear of the lamp 1. Further, it is assumed that the predetermined value is 0%. In this case, when the remaining amount of the lamp reaches a predetermined value of 0%, the calculation unit 6 notifies the user that the replacement timing has come.

  Note that the notification method for notifying that the replacement timing has come is not limited to the above example. For example, the calculation unit 6 uses the OSD (On-Screen Display) function to superimpose the timing notification information on the projection image, or turns on an error notification LED or the like to indicate that the replacement timing has been reached. May be notified to the user.

  Hereinafter, the process performed by the calculation unit 6 will be described in more detail.

  FIG. 2 is a diagram illustrating the relationship between the lighting time of the lamp 1 and the luminance. Specifically, FIG. 2 shows the relationship between the lighting time and the luminance when the lamp 1 is lit in the steady lighting mode, and the relationship between the lighting time and the luminance when the lamp 1 is lit in the eco lighting mode. FIG. Further, the luminance in FIG. 2 is shown as a ratio to the initial luminance which is the initial luminance of the lamp 1.

  In general, the longer the lighting time when the lamp is lit, the more the electrodes of the lamp are worn and the gap between the electrodes becomes wider. Since the lamp is driven at a constant power, the wider the gap between the electrodes, the higher the voltage between the electrodes. When the voltage reaches an allowable value, the lamp is likely to be lost or burst. The voltage between the electrodes changes according to the lighting power supplied to the lamp. However, if the lamp electrode continues to wear, the voltage between the electrodes reaches an allowable value when the rated power is supplied to the lamp.

  In addition, as the distance between the electrodes of the lamp becomes wider, the light emitting point of the lamp becomes larger, the light use efficiency decreases, and the luminance decreases. Accordingly, when the luminance of the lamp reaches a predetermined ratio with respect to the initial luminance, for example, about 50%, the lamp is replaced because it is impossible to obtain the target luminance performance. That is, the lamp lighting time until the lamp brightness reaches 50% of the initial brightness is defined as the lamp life, and when the lamp lighting time reaches the life, the lamp is replaced. However, the life of the lamp is set so that it is less than the lamp lighting time until the voltage between the electrodes reaches the allowable value. A tolerance value is set.

  As shown in FIG. 2, the luminance of the lamp 1 gradually decreases with respect to the lighting time of the lamp 1, but the luminance reduction rate increases as the lighting power increases. For this reason, the lifetime that is the lighting time until the luminance reaches 50% is longer when the lamp 1 is lit in the eco lighting mode than when the lamp is lit in the steady lighting mode. Here, the lifetime of the lamp 1 is assumed to be 1000 hours when the lamp 1 is lit in the steady lighting mode, and 2000 hours when the lamp 1 is lit in the eco lighting mode.

  FIG. 3 is a diagram for explaining the above-mentioned problem in more detail. When the lamp 1 is lit in each of the steady lighting mode and the eco lighting mode, the lighting time of the lamp 1 and the distance between the electrodes of the lamp 1 are as follows. The relationship with the lamp voltage which is a voltage is shown. The lifetime of the lamp 1 is 1000 hours when the lamp 1 is lit in the steady lighting mode, and 2000 hours when the lamp 1 is lit in the eco lighting mode. Further, it is assumed that the allowable value of the lamp voltage is 150V.

  The dotted line A in FIG. 3 shows the lamp voltage immediately after the lighting mode is switched from the eco lighting mode to the steady lighting mode, and the dotted line B in FIG. 3 is lit when the lamp 1 is lit for 2000 hours in the eco lighting mode. The lamp voltage after the mode is switched from the eco lighting mode to the steady lighting mode is shown. Usually, the dotted line A is a translation of the line indicating the lamp voltage in the eco lighting mode, and the dotted line B is a translation of the line indicating the lamp voltage in the steady lighting mode. When the lighting mode is switched to the steady lighting mode after the lamp 1 has been lit for 2000 hours or more in the eco lighting mode, the lamp voltage exceeds the allowable value in a short time as indicated by the dotted line B. When lit for 2000 hours or more in the lighting mode, the lamp 1 cannot be lit for a long time in the steady lighting mode.

  In the example of FIG. 3, when the lamp 1 is lit in the steady lighting mode, the lamp voltage reaches the allowable value of 150 V when the lighting time reaches 1000 hours, which is the lifetime, and the lamp 1 is lost or ruptured. It tends to occur. However, since the allowable value is set with a margin, there is no immediate loss of light or explosion.

  On the other hand, when the lamp 1 is lit in the eco lighting mode, the lamp voltage is lower than the allowable value because the power supplied to the lamp 1 is low even when the lighting time reaches 2000 hours, which is the lifetime. The lamp 1 can be turned on for up to 3000 hours.

  That is, even if the lighting time of the lamp 1 reaches the end of its life, the lamp 1 is less likely to be lost or ruptured in the eco lighting mode, and the lamp 1 can be used for a while. In FIG. 3, the dotted line C shows the relationship between the excess lighting time, which is the lighting time of the lamp 1 that can be lit even when the lifetime is exceeded, and the luminance at the excess lighting time in the eco lighting mode. It is assumed that the excess lighting time is 1000 hours. That is, in the eco lighting mode, the lamp 1 can be lit for 3000 hours. However, as shown in FIG. 3, when the lamp is lit for 2000 hours or more, the lamp brightness is 50% or less of the initial brightness. However, the eco lighting mode is a mode that does not place importance on the brightness. Absent.

  If the lighting time of the lamp 1 has reached the end of its service life, when notifying that the replacement timing has been reached, the calculation unit 6 corrects the lighting time of the lamp 1 according to the lighting mode, and uses the corrected lighting time. The remaining amount of the lamp may be calculated based on a certain corrected lighting time. Specifically, the calculation unit 6 corrects the eco lighting time Te when the lamp 1 is lit in the eco lighting mode to the lighting time corresponding to the steady lighting mode. That is, 1/2 of the eco lighting time Te (= (life in the eco lighting mode) / (life in the steady lighting mode)) is used as the corrected lighting time, and the steady lighting time Tn when the lamp 1 is lit in the steady lighting mode is corrected as it is. By calculating the lighting time, the corrected lighting time (= Tn + Te / 2) is calculated, and the lamp remaining amount R is calculated as R = 1− (corrected lighting time) / (lifetime of the steady lighting mode) = 1− (Tn + Te / 2). ) / 1000. When the remaining lamp amount is displayed as a percentage [%], the remaining lamp amount is R × 100 [%].

  FIG. 4 is a diagram showing the relationship between the lighting time and the remaining lamp amount when the remaining lamp amount R is calculated by R = 1− (Tn + Te / 2) / 1000.

  In the example of FIG. 4, when the lamp 1 is lit in the steady lighting mode, it is notified that the replacement timing has been reached when the lighting time reaches 1000 hours, and when the lamp is lit in the eco lighting mode, the lighting time is 2000 hours. Then, it is notified that the replacement timing has come. However, in this case, in the eco lighting mode, the fact that the replacement timing has been reached is notified regardless of whether the lamp 1 can be lit for a further 1000 hours, and the replacement timing is appropriately notified. I can't.

  FIG. 5 shows that when the lamp 1 is lit in the eco lighting mode, the lamp remaining amount R is set to R = 1− (Tn + Te / 3) so that when the lighting time reaches 3000 hours, the replacement timing is notified. It is a figure which shows the relationship between lighting time and a lamp | ramp remaining amount when calculating by / 1000. In this example, 1/3 of the eco lighting time Te is the corrected lighting time, and the steady lighting time Tn is the corrected lighting time as it is.

  In the example of FIG. 5, when the lamp 1 is always lit in the eco lighting mode, it is notified that the replacement timing has been reached when the lighting time reaches 3000 hours. However, if the lighting mode is switched from the eco lighting mode to the steady lighting mode after the lamp 1 has been lit for 2000 hours in the eco lighting mode, the remaining amount of the lamp becomes 33%. This corresponds to a lighting time of 667 hours when the lamp 1 is lit in the steady lighting mode. Therefore, after the lamp 1 is lit for 2000 hours in the eco lighting mode, it can be lit for 333 hours in the steady lighting mode. . However, in actuality, when the lamp 1 is lit for 2000 hours in the eco lighting mode, the time during which the lamp 1 can be lit in the steady lighting mode is short. Therefore, in the example of FIG. I can't notify you.

  Therefore, in the present embodiment, as described above, the calculation unit 6 obtains a corrected lighting time in which the lighting time is corrected based on the lighting time and the lighting power of the lamp 1, and according to the corrected lighting time, By calculating the degree of wear, it is possible to appropriately notify that the replacement timing has come.

  Specifically, the calculation unit 6 determines a correction formula for correcting the lighting time according to the lighting power according to the lighting time, and obtains the corrected lighting time using the determined correction formula. More specifically, the calculation unit 6 first obtains a corrected lighting time using a first correction formula determined in advance as a correction formula, and when the eco lighting time is equal to or greater than a predetermined threshold value, A corrected lighting time is obtained using a second correction formula different from the first correction formula.

  The processing of the calculation unit 6 will be described below using a specific example.

  FIG. 6 is a diagram illustrating an example of a relationship between a lighting time and a remaining lamp amount in the present embodiment.

  In the example of FIG. 6, the remaining amount of the lamp is a predetermined value, for example, 1% in each of the state where the lamp 1 is lit for 990 hours in the steady lighting mode and the state where the lamp 1 is lit for 2000 hours in the eco lighting mode. It becomes. The predetermined value of the remaining amount of the lamp is set based on the relationship between the lamp lighting time until the voltage between the lamp electrodes reaches an allowable value and the time at which the light loss or explosion actually occurs. The predetermined value can be increased.

  In this case, the calculation unit 6 sets the lighting time (specifically, the steady lighting time Tn and the eco lighting time Te) to the first correction formula “T1 = Tn + Te / ((lifetime of the eco lighting mode) / ((steady lighting). Mode lifetime) × (1−predetermined value of remaining amount of lamp) = Tn + Te / (2000/990) ”to obtain a corrected lighting time T1, and the remaining amount of lamp based on the corrected lighting time T1. R is calculated as R = 1− (correction lighting time) / (lifetime of steady lighting mode) = 1−T1 / 1000 = 1− (Tn + Te / (2000/990)) / 1000.

  When the lighting is performed beyond the life in the eco lighting mode, that is, when the eco lighting time Te is 2000 hours or more, the calculation unit 6 sets the lighting time to the second correction formula “T2 = Tn + ((life in the steady lighting mode). ) × (1−predetermined value of remaining amount of lamp) + (Te−lifetime of eco lighting mode)) / (lifetime of steady lighting mode) / ((lifetime of steady lighting mode) × (predetermined amount of remaining lamp) Value))) = Tn + 990 + (Te−2000) / (1000/10) ”to obtain a corrected lighting time T2, and based on the corrected lighting time T2, the remaining lamp amount is calculated as R = 1−. (Correction lighting time) / (lifetime of steady lighting mode) = 1−T2 / 1000 = 1− (Tn + 990 + (Te−2000) / (1000/10)) / 1000.

  By calculating the remaining amount of the lamp as described above, the remaining amount of the lamp becomes 1% when the lamp 1 is lit for 2000 hours in the eco lighting mode. Therefore, when the lighting mode is switched to the steady lighting mode at this time, Only the remaining 10 hours can be lit. Further, since the lighting time in the steady lighting mode after the lifetime of the lamp 1 is exceeded can be set to a short time, problems such as explosion of the lamp 1 are less likely to occur. Note that the notification that the replacement timing has come is made when the remaining lamp amount becomes 0%.

  Next, the operation will be described.

  FIG. 7 is a flowchart for explaining the operation of the projector according to the present embodiment.

  First, when it is time to start projecting an image, the lighting control unit 4 selects a steady lighting mode or an eco lighting mode as a lighting mode to be set in the lamp driving unit 3, and the selected lighting mode is given to the lamp driving unit 3. At the same time, the lamp driving unit 3 is operated. Thereby, the lighting power corresponding to the lighting mode set in the lamp driving unit 3 is supplied to the lamp 1, the lamp 1 is turned on, and an image is displayed on the screen (step S701). Note that the timing of starting image projection is, for example, the timing when the projector is activated or the timing when the projector returns from the sleep mode.

  When operating the lamp driving unit 3, the lighting control unit 4 notifies the calculation unit 6 of mode information indicating the lighting mode set in the lamp driving unit 3. The calculation unit 6 acquires the lamp lighting time and lamp remaining amount information corresponding to each lighting mode from the nonvolatile memory 5 and starts measuring the lamp lighting time (step S702). The calculation unit 6 adds the measured lighting time to the lamp lighting time corresponding to the lighting mode set in the lamp driving unit 3 acquired from the nonvolatile memory 5.

  Then, the calculation unit 6 determines whether or not the eco lighting time Te is equal to or more than a predetermined threshold, for example, 2000 hours that is the lamp life in the eco lighting mode (step S703).

  When there are a plurality of eco lighting modes, the determined eco lighting time is the eco lighting time in the eco lighting mode that operates with the minimum eco power, and the threshold value is the eco lighting mode (with the minimum eco power). The life of the lamp in the operating eco lighting mode) is used. With minimum eco-power, the life of eco-lighting mode is maximized.

  When the eco lighting time Te is shorter than 2000 hours, the calculation unit 6 uses the first correction formula to correct the lighting time according to the lighting mode indicated by the mode information to obtain the lighting correction time. Then, the calculation unit 6 updates the remaining amount of lamp based on the lighting correction time, and stores the remaining lamp amount information indicating the updated remaining lamp amount in the nonvolatile memory 5 (step S704).

  On the other hand, when the eco lighting time Te is 2000 hours or more, the calculation unit 6 uses the second correction formula to correct the lighting time according to the lighting mode indicated by the mode information to obtain the lighting correction time. Then, the calculation unit 6 updates the remaining lamp amount based on the lighting correction time, and stores the remaining lamp information indicating the updated remaining lamp amount in the nonvolatile memory 5 (step S705).

  When step S704 or S705 ends, the calculation unit 6 determines whether the updated lamp remaining amount is 0% or less (step S706).

  When the remaining lamp amount is 0% or less, the calculation unit 6 displays timing notification information on the display unit 7 (step S707).

  When the lamp remaining amount is higher than 0% in step S706 and when the timing notification information is displayed in step S707, the calculation unit 6 determines whether or not the measurement of the lamp lighting time is to be ended (step S708). . For example, when the operation of the projector is stopped or the sleep mode is set for the projector, the lighting control unit 4 stops the operation of the lamp driving unit 3 and finish information indicating that the measurement of the lighting time is ended. Is notified to the calculation unit 6. When the end information is notified, the calculation unit 6 determines to end the lamp lighting time measurement, and when the end information is not notified, the calculation unit 6 determines not to end the lamp lighting time measurement.

  The calculation unit 6 returns to the process of step S703 when the measurement of the lighting time is not finished, and ends the process when the measurement of the lighting time is finished.

  When the timing notification information is displayed in step S707, for example, the lighting control unit 4 may stop the operation of the lamp driving unit 3 after a predetermined time has elapsed. If the timing notification information is displayed in step S707, the process may be terminated without moving to step 708.

  As described above, according to the present embodiment, the degree of wear of the lamp 1 is calculated according to the corrected lighting time in which the lighting time is corrected based on the lighting time of the lamp 1 and the lighting power supplied to the lamp. Therefore, even when the appropriate replacement timing of the lamp 1 differs according to the lighting power, it is possible to calculate the degree of wear that appropriately reflects the replacement timing. Therefore, it is possible to accurately grasp the replacement timing for replacing the lamp.

  In each embodiment described above, the illustrated configuration is merely an example, and the present invention is not limited to the configuration.

DESCRIPTION OF SYMBOLS 1 Lamp 2 Projection part 3 Lamp drive part 4 Lighting control part 5 Non-volatile memory 6 Calculation part 7 Display part

Claims (4)

A light source;
A light source driving unit that supplies lighting power to the light source and lights the light source;
A lighting control unit for adjusting the lighting power;
A calculation unit that measures a lighting time when the light source is turned on and calculates a degree of wear of the light source according to a corrected lighting time obtained by correcting the lighting time, which is obtained based on the lighting time and the lighting power; I have a,
The calculation unit corrects the lighting time according to the lighting power, and the minimum power lighting in the lighting mode for supplying the minimum lighting power among the plurality of lighting modes for supplying different lighting power to the light source. A projector that determines according to time and obtains the corrected lighting time using the determined correction formula . The projector according to claim 1 , wherein
The calculation unit obtains the corrected lighting time by using a first correction expression that is predetermined as the correction expression, and when the minimum power lighting time is equal to or greater than a threshold, the first correction expression is used as the correction expression. A projector that obtains the corrected lighting time using a second correction formula different from the above. In the projector according to claim 1 or 2 ,
The calculation unit calculates a remaining time during which the light source can be turned on as the degree of wear. A detection method for detecting the replacement timing of a light source of a projector,
Adjust the lighting power to be supplied to the light source,
Measure the lighting time when the light source is turned on,
A correction formula for calculating the degree of wear of the light source according to the corrected lighting time obtained by correcting the lighting time , which is obtained based on the lighting time and the lighting power, and correcting the lighting time according to the lighting power. , A plurality of lighting modes for supplying different lighting power to the light source, determined according to the minimum power lighting time in the lighting mode for supplying the minimum lighting power, and using the determined correction formula, the corrected lighting time Detection method.

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