JP2017129702A - Projector and projector control method - Google Patents

Abstract

A projector is provided that can easily match the amount of light emitted from a light source to a set amount of light by using a detector included in the projector. A light source unit (111), a light source driving unit (121) that drives the light source unit (111), a red light sensor that detects the amount of light emitted from the light source unit (111), and a driving condition set in advance for the light source unit (111). and a storage unit 160 for storing light amount information indicating the amount of light detected by the red light sensor when driven by the light source driving unit 121. a light source control unit 172 that generates driving parameters for the light source driving unit 121 for setting the light amount of the light emitted from the light source unit 111 to the set light amount based on the sensor value and the light amount information stored in the storage unit 160; Prepare. [Selection drawing] Fig. 1

Description

  The present invention relates to a projector and a method for controlling the projector.

In recent years, a light source called a solid light source such as a laser diode (LD) or a light emitting diode (LED) has been mounted as a light source of a projector. These light sources have a problem that the brightness of the image displayed by the projector differs from the desired brightness due to the deterioration of the light source.
With respect to this problem, the projector disclosed in Patent Document 1 is a solid-state light source that emits excitation light, a phosphor that converts excitation light into fluorescence, and light that detects at least one of excitation and fluorescence converted by the phosphor. A sensor and a control device that controls at least one of a solid-state light source or a light modulation device that modulates fluorescence according to the detection result of the optical sensor.

JP2012-47951A

By the way, the light source of a projector is used with various brightness according to several drive conditions. For this reason, even if the light quantity of a light source changes, it is desirable that the light quantity of a light source can be easily matched with the set light quantity using the detection part with which a projector is provided.
The present invention has been made in view of the above circumstances, and an object of the present invention is to easily match the light amount of light emitted from a light source with a set light amount by using a detection unit provided in a projector.

In order to achieve the above object, a projector according to the present invention includes a light source, a light source driving unit that drives the light source, a detection unit that detects the amount of emitted light emitted from the light source, and the light source set in advance. A storage unit that stores light amount information indicating a light amount detected by the detection unit when driven by a driving condition; and the detection unit configured to drive the light source under a driving condition set in advance in the light source driving unit. A light source control unit that generates a drive parameter of the light source driving unit for setting a light amount of light emitted from the light source to a set light amount based on a detection value to be detected and light amount information stored in the storage unit; It is characterized by providing.
According to the present invention, the light quantity of the light emitted from the light source can be easily adjusted to the set light quantity by using the detection unit provided in the projector. Therefore, for example, when the amount of light emitted from the light source has deteriorated over time, drive parameters corresponding to the deterioration of the light source can be generated.

According to the present invention, in the projector having the above-described configuration, the light source control unit drives the light source under a preset driving condition when a preset condition is satisfied, and detects the light amount detected by the detection unit. The light quantity information stored in the storage unit is updated with the light quantity information indicating.
According to the present invention, the light amount information stored in the storage unit can be updated when a preset condition is satisfied.

In the projector having the above configuration, the light source control unit may drive the light source in advance when a preset condition is satisfied and the light amount information stored in the storage unit is updated. The driving parameter is generated again based on a detection value detected by the detection unit and light amount information stored in the storage unit.
According to the present invention, when the light amount information stored in the storage unit is updated, the drive parameter can be generated again based on the updated light amount information.

According to the present invention, in the projector having the above-described configuration, the projector includes a separation optical system that separates the emitted light emitted from the light source into a plurality of color lights, and the detection unit calculates the amount of red light among the plurality of color lights. And the light source control unit generates a drive parameter based on the detection value of the red light detected by the detection unit and the light amount information of the red light stored in the storage unit. .
According to the present invention, it is possible to generate a drive parameter based on the amount of red light among a plurality of color lights separated by the separation optical system. Since the red light is the color light that most reflects the luminance of the light source among the plurality of color lights, it is possible to generate a drive parameter that reflects the luminance of the light source.

According to the present invention, in the projector configured as described above, the light source control unit drives the light source under a plurality of driving conditions and drives the light source under each driving condition when a preset condition is satisfied. In this case, a driving parameter for driving the light source driving unit is calculated for each of the plurality of driving conditions based on the amount of light detected by the detecting unit.
According to the present invention, it is possible to calculate drive parameters for driving a light source under a plurality of drive conditions and driving a light source drive unit for each of the plurality of drive conditions. Therefore, when the amount of light emitted from the light source is deteriorated over time, a drive parameter corresponding to the deterioration of the light source can be generated for each drive condition.

According to the present invention, in the projector configured as described above, the light source control unit may select one of a drive current for driving the light source and a duty of a PWM signal for switching on and off of the light source as the plurality of drive conditions. One of them is changed, and a drive parameter for driving the light source drive unit is calculated for each of the plurality of drive conditions.
According to the present invention, it is possible to change the light amount of the light source unit by changing either the drive current or the duty of the PWM signal, and generate drive parameters under a plurality of drive conditions.

In the projector having the above-described configuration, the present invention further includes an input unit for inputting image data, and the light source control unit drives the light source driving unit to set a light amount of light emitted from the light source to a set light amount. The light quantity of the light source is controlled based on the parameter and a parameter calculated based on the luminance of the image data input to the input unit.
According to the present invention, the light amount of the light source can be controlled based on the brightness of the image data and the drive parameter for setting the light amount of the light emitted from the light source to the set light amount.

In the projector having the above-described configuration, the light source control unit generates a driving parameter of the light source driving unit in a power-off sequence executed when the power of the projector is turned off. .
According to the present invention, the driving parameter of the light source driving unit is generated in the power-off sequence. Therefore, it is possible to reduce the influence on other operations of the projector when generating the drive parameter.

In the projector having the above-described configuration, the present invention further includes a receiving unit that receives an input, and the light source control unit generates a driving parameter of the light source driving unit at a timing specified by the input received by the receiving unit. It is characterized by doing.
According to the present invention, the driving parameter of the light source driving unit is generated at the timing specified by the input received by the receiving unit. Accordingly, the drive parameter can be generated at a timing designated by the user.

In the projector control method of the invention, the light source is driven under a preset driving condition, the step of detecting the light amount of the emitted light emitted from the light source, and the light amount information indicating the detected light amount of the emitted light. In the storage unit, the light source is driven under preset driving conditions, the light amount of the emitted light emitted from the light source is detected, the detected value detected, and the light amount stored in the storage unit And generating a drive parameter for setting the amount of light emitted from the light source to a set amount based on the information.
According to the present invention, the light quantity of the light emitted from the light source can be easily adjusted to the set light quantity by using the detection unit provided in the projector. Therefore, for example, when the amount of light emitted from the light source has deteriorated over time, drive parameters corresponding to the deterioration of the light source can be generated.

The figure which shows the structure of a projector. The figure which shows the structure of a color separation part and a light modulation apparatus. The figure which shows the structure of a light source control part. The figure which shows a drive current-light quantity characteristic table and a duty ratio-light quantity characteristic table. The flowchart which shows operation | movement of a light source calibration process part. The figure which shows the state which plotted the measured value on the drive current-light quantity characteristic table. The flowchart which shows operation | movement of a light source drive parameter production | generation part.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram illustrating a configuration of the projector 100.
The projector 100 is connected to an external image supply device 200 such as a personal computer or various video players, and projects an image based on an image signal supplied from the image supply device 200 onto a projection target.
The image supply device 200 may be a video playback device, a DVD (Digital Versatile Disk) playback device, a TV tuner device, a CATV (Cable television) set top box, a video output device such as a video game device, a personal computer, or the like. it can.
The projection target may be an object that is not uniformly flat, such as a building or an object, or may have a flat projection surface such as a screen SC or a wall surface of a building. FIG. 1 shows a flat screen SC as a projection target.

The projector 100 includes an image input interface unit (hereinafter abbreviated as an image input I / F unit) 151. The image input I / F unit 151 corresponds to the “input unit” of the present invention.
The image input I / F unit 151 includes a connector for connecting a cable and an interface circuit (both not shown), and inputs an image signal supplied from the image supply device 200 connected via the cable. The image input I / F unit 151 converts the input image signal into image data and outputs the image data to the image processing unit 153.
The interface provided in the image input I / F unit 151 may be a data communication interface such as Ethernet (registered trademark), IEEE 1394, USB, or the like. Further, the interface of the image input I / F unit 151 may be an interface for image data such as MHL (registered trademark), HDMI (registered trademark), and DisplayPort.
Further, the image input I / F unit 151 may include a VGA terminal to which an analog video signal is input and a DVI (Digital Visual Interface) terminal to which digital video data is input as a connector. Further, the image input I / F unit 151 includes an A / D conversion circuit. When an analog video signal is input via the VGA terminal, the analog video signal is converted into image data by the A / D conversion circuit. The data is output to the processing unit 153.

  The projector 100 includes a display unit 110 that forms an optical image and projects the image onto the screen SC. The display unit 110 includes a light source unit 111, a color separation unit 112, a light modulation device 113, and a projection optical system 114. The light source unit 111 corresponds to the “light source” of the present invention. The color separation unit 112 corresponds to the “separation optical system” of the present invention.

The light source unit 111 includes a solid light source. As the solid light source, a light source using a light emitting element such as an LED (Light Emitting Diode) or a semiconductor laser element can be used. As the semiconductor laser element, one constituted by a single semiconductor laser element or one provided with a plurality of semiconductor laser elements arranged in a planar shape can be used. The light source unit 111 of this embodiment includes a semiconductor laser element as a solid light source, and emits high-output blue light (emitted light). The light source unit 111 includes a phosphor wheel (not shown) having a phosphor, and blue light emitted from the solid light source is converted into yellow light (fluorescence) including red light and green light by the phosphor wheel, The data is output to the color separation unit 112. Blue light and yellow light emitted from the light source correspond to the emitted light of the present invention. Further, blue light transmitted through the phosphor wheel is output to the color separation unit 112.
The light source unit 111 may be configured to include three solid-state light sources corresponding to red, green, and blue colors. Hereinafter, the solid light source included in the light source unit 111 is simply referred to as a light source.
The light source unit 111 may include a light scanning element that scans light emitted from the light source and a lens group that enhances the optical characteristics of the emitted light.

The light source unit 111 is driven by the light source driving unit 121. The light source driving unit 121 is connected to the internal bus 180.
The light source drive unit 121 controls the drive current that drives the light source unit 111 and the drive signal that is output to the light source unit 111 according to the control of the control unit 170, and the light amount output by the light source of the light source unit 111 (hereinafter referred to as output light amount). ) To control.

  Information specifying the duty ratio of a PWM (pulse width modulation) signal is input to the PWM signal generation unit 122 from a setting unit 330 (see FIG. 3) described later. The PWM signal generation unit 122 generates a PWM signal having a duty ratio specified by information input from the setting unit 330 and outputs the PWM signal to the light source driving unit 121.

  The color separation unit 112 includes a mirror and a lens (see FIG. 2), and light emitted from the light source of the light source unit 111 is red light (hereinafter also referred to as R light), green light (hereinafter also referred to as G light), and blue light. The light is separated into three colors of light (hereinafter also referred to as B light) and guided to the light modulation device 113.

  The light modulation device 113 includes a liquid crystal panel 115. The liquid crystal panel 115 includes, for example, three liquid crystal panels 115R, 115G, and 115B (see FIG. 2) corresponding to the three primary colors R, G, and B. The R, G, and B color lights separated by the color separation unit 112 are incident on the corresponding liquid crystal panels 115R, 115G, and 115B, respectively. The liquid crystal panel 115 is a transmissive liquid crystal panel, and modulates transmitted light to generate image light. The image light modulated through the liquid crystal panels 115R, 115G, and 115B is combined by the cross dichroic prism 118 (see FIG. 2) and emitted to the projection optical system 114.

A light modulation device driving unit 123 is connected to the light modulation device 113. The light modulator driving unit 123 is connected to the internal bus 180.
The light modulator driving unit 123 generates an image signal for each of R, G, and B colors based on a display image signal (described later) input from the image processing unit 153. The light modulation device driving unit 123 drives the corresponding liquid crystal panels 115R, 115G, and 115B of the light modulation device 113 based on the generated R, G, and B image signals, and displays images on the liquid crystal panels 115R, 115G, and 115B. Draw light.

  The projection optical system 114 includes a lens group that projects the image light modulated by the light modulation device 113 onto the screen SC and forms an image on the screen SC. Further, the projection optical system 114 may include a zoom mechanism for enlarging / reducing the projected image on the screen SC and adjusting the focus, and a focus adjusting mechanism for adjusting the focus.

FIG. 2 is a diagram illustrating configurations of the color separation unit 112 and the light modulation device 113.
The color separation unit 112 includes dichroic mirrors 131 and 132, reflection mirrors 133 to 135, relay lenses 136 and 137, and condenser lenses 116R, 116G, and 116B.

The dichroic mirrors 131 and 132 are mirrors in which a wavelength selective transmission film that reflects light in a predetermined wavelength region and passes light in other wavelength regions is formed on a transparent substrate.
Specifically, the dichroic mirror 131 passes the R light component and reflects the G light component and the B light component, and the dichroic mirror 132 reflects the G light component and passes the B light component.

The reflection mirror 133 is a mirror that reflects the R light component, and the reflection mirrors 134 and 135 are mirrors that reflect the B light component.
The relay lens 136 is disposed between the dichroic mirror 132 and the reflection mirror 134, and the relay lens 137 is disposed between the reflection mirror 134 and the reflection mirror 135. These relay lenses 136 and 137 are provided in order to prevent a decrease in light use efficiency due to light divergence and the like because the length of the optical path of the B light is longer than the length of the optical paths of the other color lights.
The condensing lenses 116R, 116G, and 116B convert the R light component reflected by the reflection mirror 133, the G light component reflected by the dichroic mirror 132, and the B light component reflected by the reflection mirror 135 into the liquid crystal panels 115R and 115G. , 115B, respectively.

  Each of the liquid crystal panels 115R, 115G, and 115B of the light modulation device 113 modulates the incident color light according to an image signal input from the outside, and converts red image light, green image light, and blue image light. Generate each.

The projector 100 includes an optical sensor 117. The optical sensor 117 corresponds to the “detection unit” of the present invention. The light sensor 117 includes a red light sensor 117R and a blue light sensor 117B. The red light sensor 117R detects the R light, and outputs a sensor value (detection value) indicating the detected light amount of the R light to the control unit 170. The blue light sensor 117B detects the B light and outputs a sensor value indicating the detected amount of the B light to the control unit 170.
The red light sensor 117 </ b> R is disposed on the back side of the reflection surface on which the reflection mirror 133 reflects R light, and detects a slight amount of R light transmitted through the reflection mirror 133.
The blue light sensor 117 </ b> B is disposed on the back side of the reflection surface where the reflection mirror 135 reflects the B light, and detects a slight amount of B light transmitted through the reflection mirror 135.
Various sensors such as a photodiode, an illuminance sensor, and a color sensor for each color of R, G, and B can be used as the optical sensors used as the red light sensor 117R and the blue light sensor 117B.

Returning to FIG. 1, the configuration of the projector 100 will be described.
The projector 100 includes an operation panel 141 and an input processing unit 143. The input processing unit 143 is connected to the internal bus 180. The operation panel 141 corresponds to a “reception unit” of the present invention.
On the operation panel 141 functioning as a user interface, various operation keys and a display screen composed of a liquid crystal panel are displayed. When the operation key displayed on the operation panel 141 is operated, the input processing unit 143 outputs data corresponding to the operated key to the control unit 170. Further, the input processing unit 143 displays various screens on the operation panel 141 under the control of the control unit 170.
The operation panel 141 is integrally formed with a touch sensor that detects contact with the operation panel 141. The input processing unit 143 detects the position of the operation panel 141 touched by the user's finger or the like as the input position, and outputs data corresponding to the detected input position to the control unit 170.

The projector 100 also includes a remote control light receiving unit 142 that receives an infrared signal transmitted from the remote controller 5 used by the user. The remote control light receiving unit 142 is connected to the input processing unit 143. The remote controller 5 and the remote control light receiving unit 142 correspond to the “accepting unit” of the present invention.
The remote control light receiving unit 142 receives an infrared signal transmitted from the remote control 5. The input processing unit 143 decodes the infrared signal received by the remote control light receiving unit 142, generates data indicating the operation content in the remote control 5, and outputs the data to the control unit 170.

  The projector 100 includes a wireless communication unit 145. The wireless communication unit 145 is connected to the internal bus 180. The wireless communication unit 145 includes an antenna (not shown), an RF (Radio Frequency) circuit, and the like, and performs wireless communication with an external device under the control of the control unit 170. The wireless communication method of the wireless communication unit 145 is, for example, a wireless LAN (Local Area Network), Bluetooth (registered trademark), UWB (Ultra Wide Band), near field communication methods such as infrared communication, or wireless using a cellular phone line A communication method can be adopted.

  The projector 100 includes an image processing system. The image processing system is configured with a control unit 170 that controls the entire projector 100 as a whole, and further includes an image processing unit 153, a frame memory 155, and a storage unit 160. The control unit 170, the image processing unit 153, and the storage unit 160 are connected to the internal bus 180.

  The image processing unit 153 expands the image data input from the image input I / F unit 151 in the frame memory 155 under the control of the control unit 170, and executes image processing on the expanded image data. Image processing executed by the image processing unit 153 includes, for example, resolution conversion (scaling) processing, frame rate conversion processing, shape correction processing, zoom processing, color tone correction processing, luminance correction processing, and the like. Of course, it is also possible to execute a combination of a plurality of processes.

The resolution conversion process is a process in which the image processing unit 153 converts the resolution of the image data in accordance with the resolution specified by the control unit 170, for example, the display resolution of the liquid crystal panel of the light modulation device 113.
The frame rate conversion process is a process in which the image processing unit 153 converts the frame rate of the image data to the frame rate specified by the control unit 170.
The shape correction process is a process in which the image processing unit 153 converts the image data in accordance with the correction parameter input from the control unit 170 and corrects the shape of the image projected on the screen SC.
The zoom process is a process in which the image processing unit 153 enlarges / reduces an image when zooming is instructed by an operation of the remote controller 5 or the operation panel 141.
The color tone correction process is a process for converting the color tone of the image data, and the image processing unit 153 changes the data of each pixel included in the image data in accordance with the color tone specified by the control unit 170. In this process, the projector 100 can realize a color tone suitable for movie viewing, a color tone suitable for when the screen SC is installed in a bright environment, a color tone suitable for projection on a non-white screen SC such as a blackboard, and the like. . In addition to the color tone correction process, contrast adjustment or the like may be performed.
The brightness correction process is a process in which the image processing unit 153 corrects the brightness of the image data. Through the luminance correction process, the luminance of the image data is corrected to a luminance corresponding to the light emission state of the light source unit 111, the brightness of the environment in which the projector 100 is installed, and the like.
The contents of the above-described processing executed by the image processing unit 153, the parameters, and the start and end timing of the processing are controlled by the control unit 170.
The image processing unit 153 reads the processed image data from the frame memory 155 and outputs it as a display image signal to the light modulation device driving unit 123.

  The storage unit 160 includes a nonvolatile memory such as a flash memory or an EEPROM. The storage unit 160 stores data processed by the control unit 170 and a control program executed by the control unit 170 in a nonvolatile manner. The storage unit 160 also stores setting values for various processes executed by the image processing unit 153, a table referred to by the control unit 170, and sensor values measured by the optical sensor 110.

  The control unit 170 includes hardware such as a CPU, a ROM, and a RAM (all not shown). The ROM is a nonvolatile storage device such as a flash ROM, and stores a control program and data. The RAM constitutes a work area of the CPU. The CPU expands the control program read from the ROM and the storage unit 160 in the RAM, and executes the control program expanded in the RAM to control each unit of the projector 100.

  The control unit 170 includes a projection control unit 171 and a light source control unit 172 as functional blocks. These functional blocks are realized by the CPU executing a control program stored in the ROM or the storage unit 160.

The projection control unit 171 adjusts the display mode of the image on the display unit 110 and executes the projection of the image onto the screen SC.
Specifically, the projection control unit 171 controls the image processing unit 153 to perform image processing on the image data input from the image input I / F unit 151. At this time, the projection control unit 171 may read out parameters necessary for processing by the image processing unit 153 from the storage unit 160 and output them to the image processing unit 153.

  The light source control unit 172 controls the light source driving unit 121 and the PWM signal generation unit 122 to turn on the light source of the light source unit 111 and adjust the light amount of the light source. Details of the light source control unit 172 will be described with reference to FIG.

FIG. 3 is a diagram illustrating a configuration of the light source control unit 172.
The light source control unit 172 includes a first luminance setting unit 301, a second luminance setting unit 302, a third luminance setting unit 303, a switching unit 304, an integration unit 305, a light source calibration processing unit 310, a light source driving parameter generation unit 320, and a setting unit. 330 is provided.

Brightness information is input from the image processing unit 153 to the first luminance setting unit 301.
For example, the image processing unit 153 calculates the average luminance of one frame of the image data based on the image data input from the image input I / F unit 151. The image processing unit 153 outputs the calculated average luminance of one frame to the first luminance setting unit 301 as brightness information.
Based on the brightness information input from the image processing unit 153, the first luminance setting unit 301 generates a first drive parameter that is information for designating the output light amount set for the light source. The first drive parameter is information indicating the output light amount set for the light source. For example, the maximum light amount that can be output by the light source is 100%, and the output light amount set for the light source is a ratio (for example, 70% or the like) ). The first luminance setting unit 301 outputs the generated first driving parameter to the integrating unit 305.

The luminance switching information is input from the input processing unit 143 to the second luminance setting unit 302.
The user can operate the operation panel 141 or the remote controller 5 to set the brightness of an image projected on the screen SC (hereinafter referred to as a projected image) in, for example, three levels of low brightness, medium brightness, and high brightness. it can. The input processing unit 143 outputs luminance switching information indicating the luminance corresponding to the operation received by the operation panel 141 or the remote controller 5 to the second luminance setting unit 302.
The second luminance setting unit 302 generates a second luminance parameter that is information for designating an output light amount to be set for the light source in accordance with the input luminance switching information. Similarly to the first luminance parameter, the second luminance parameter is information indicating the output light amount set for the light source as a percentage of the maximum light amount. The second luminance setting unit 302 outputs the generated second drive parameter to the switching unit 304.

Information is input from the input processing unit 143 to the third luminance setting unit 303. The user can input an operation for instructing to keep the light amount of the light source constant by operating the operation panel 141 or the remote controller. The information input from the input processing unit 143 to the third luminance setting unit 303 includes instruction information for instructing to maintain the output light amount of the light source at a constant light amount (hereinafter referred to as a constant light amount), and the constant light amount to be maintained. Specification information to be specified is input.
The third luminance setting unit 303 outputs the input information to the light source drive parameter generation unit 320 when the instruction information and the designation information of a certain amount of light are input from the input processing unit 143.
When the instruction information and the constant light amount designation information are input from the third luminance setting unit 303, the light source drive parameter generation unit 320 sets the output light amount of the light source to the light amount designated by the constant light amount designation information. Generate driving parameters for The drive parameter generation procedure of the light source drive parameter generation unit 320 will be described with reference to the flowchart shown in FIG. The light source drive parameter generation unit 320 outputs the generated drive parameter to the third luminance setting unit 303.

  When the driving parameter is input from the light source driving parameter generation unit 320, the third luminance setting unit 303 outputs the input parameter to the switching unit 304 as the third driving parameter. Similarly to the first and second luminance parameters, the third luminance parameter is information indicating the output light amount set for the light source as a percentage of the maximum light amount.

  The second driving parameter is input from the second luminance setting unit 302 and the third driving parameter is input from the third luminance setting unit 303 to the switching unit 304. The switching unit 304 selects either the second driving parameter input from the second luminance setting unit 302 or the third driving parameter input from the third luminance setting unit 303 and outputs the selected one to the integrating unit 305. . For example, when the third driving parameter is input from the third luminance setting unit 303, the switching unit 304 gives priority to the third driving parameter and outputs the third driving parameter to the integrating unit 305. Further, the switching unit 304 outputs the second drive parameter input from the second luminance setting unit 302 to the integrating unit 305 when there is no input of the third drive parameter from the third luminance setting unit 303.

The integration unit 305 receives the first drive parameter from the first luminance setting unit 301 and the second drive parameter or the third drive parameter from the switching unit 304.
When the second drive parameter or the third drive parameter is not input from the switching unit 304, the integrating unit 305 outputs the first drive parameter input from the first luminance setting unit 301 to the setting unit 330 as it is.
Further, when the second drive parameter or the third drive parameter is input from the switching unit 304, the integration unit 305 determines the ratio of the output light amount of the light source indicated by the first drive parameter to the maximum light amount, the second drive parameter, or the third drive parameter. The ratio of the output light amount of the light source indicated by the drive parameter to the maximum light amount is integrated. The integration unit 305 outputs the value obtained by the integration to the setting unit 330 as a drive parameter.
For example, when the value indicated by the first drive parameter is 90% and the value indicated by the second drive parameter is 70%, the integrating unit 305 indicates a drive parameter indicating 63%, which is the product of 90% and 70%. Is output to the setting unit 330.

The setting unit 330 includes a PWM setting LUT 331 and a current setting LUT 332.
The setting unit 330 acquires the PWM signal duty ratio corresponding to the drive parameter input from the integration unit 305 from the PWM setting LUT 331. In addition, the setting unit 330 acquires the current value of the drive current corresponding to the drive parameter input from the integration unit 305 from the current setting LUT 332.
The setting unit 330 outputs information indicating the duty ratio of the PWM signal acquired from the PWM setting LUT 331 to the PWM signal generation unit 122. In addition, the setting unit 330 outputs information indicating the current value of the driving current acquired from the current setting LUT 332 to the light source driving unit 121.

The setting unit 330 is connected to the light source drive parameter generation unit 320 and the light source calibration processing unit 310.
When the information specifying the duty ratio of the PWM signal is input from the light source calibration processing unit 310 or the light source drive parameter generation unit 320, the setting unit 330 causes the PWM signal generation unit 122 to generate a PWM signal having the specified duty ratio. Instruct. In addition, when information specifying the current value of the drive current is input from the light source calibration processing unit 310 or the light source drive parameter generation unit 320, the setting unit 330 supplies the drive current having the specified current value to the light source unit 111. Thus, the light source driving unit 121 is instructed.

The light source calibration processing unit 310 executes light source calibration processing.
In the light source calibration process, the light source unit 111 is driven, the output light quantity of the light source is measured by the red light sensor 117R, the sensor value of the red light sensor 117R, the value of the drive current used for driving the light source, or the PWM signal. This is a process for specifying the relationship with the duty.
When the output light amount of the light source changes due to deterioration with time or the use environment, a deviation occurs in the relationship between the output light amount of the light source and the drive current of the light source, or the relationship between the output light amount of the light source and the duty ratio of the PWM signal. For this reason, the light source calibration process is executed to accurately specify the relationship between the drive current or the duty ratio of the PWM signal and the output light amount of the light source so that a desired output light amount can be obtained.
The reason why the sensor value of the red light sensor 117R is used as the detection unit that measures the output light amount of the light source is that, among the color lights input to the color separation unit 112, the R light is the color light that most reflects the luminance of the light source. is there. Moreover, the light quantity of B light inject | emitted from the light source part 111 and the fluorescent light produced | generated by converting B light with a fluorescent substance wheel has a proportional relationship. For this reason, if the output light quantity of R light is measured using the red light sensor 117R, the light quantity of B light and G light also becomes a value proportional to the sensor value of the red light sensor 117R.

The output light quantity of the light source is changed by controlling the drive current or the duty ratio of the PWM signal. Here, the reason for controlling the output light quantity of the light source based on the current value of the drive current and the duty ratio of the PWM signal will be described.
The upper side of FIG. 4 shows a drive current-light quantity characteristic table showing the relationship between the drive current and the output light quantity of the light source, and the lower side shows the duty ratio showing the relation between the duty ratio of the PWM signal and the output light quantity of the light source. A ratio-light quantity characteristic table is shown.
The light source controls the output light quantity by changing the duty ratio of the PWM signal below a predetermined light quantity (Lsm shown in FIG. 4), and outputs the light quantity above the light quantity Lsm by changing the drive current. The amount of light is controlled. Below the light quantity Lsm, the output light quantity of the light source can be controlled with higher accuracy by the control by the duty ratio of the PWM signal than by the control by the drive current. For this reason, the output light quantity of the light source is controlled by the duty ratio of the PWM signal below the light quantity Lsm.

  The light quantity shown in the drive current-light quantity characteristic table is indicated by a relative light quantity [%] with respect to the light quantity Lmax in the current Imax set as the maximum current in the use range in the drive constant current driveable range. Note that the current Ism is a current value set as a lower limit current that can emit light even if the light emission threshold current of the laser diode changes according to deterioration with time or the use environment. The drive current is more preferably in the range of 35% to 65% of the current Imax set as the maximum current in the usable range in the current driveable range. In this way, when a laser diode is used as the solid light source, it is possible to maintain a wide light control range until the end of the life of the laser diode.

  In the drive current-light quantity characteristic table, the drive current increases as the light quantity increases in the area of the light quantity Lsm or more, and the same current value (current Ism) in the light quantity area lower than the light quantity Lsm regardless of the light quantity. It has become. According to this drive current-light quantity characteristic table, in the area of the light quantity equal to or greater than the light quantity Lsm, for example, the drive current Ia that changes according to the change in the light quantity can be derived as the drive current corresponding to the light quantity La. In the region where the light amount is lower than the light amount Lsm, the same current as the current Ism corresponding to the light amount Lsm can be derived. In FIG. 4, it is assumed that the light amount La is a light amount intermediate between the maximum light amount 100% and the light amount Lsm.

The duty ratio-light quantity characteristic table shown in the lower side of FIG. 4 can drive the light source with the drive current according to the drive current-light quantity characteristic table in the region where the light quantity is Lsm or more, so the duty of the PWM signal is 100%. Yes.
On the other hand, in the region where the light quantity is lower than the light quantity Lsm, the duty of the PWM signal changes from 0 to 100% according to the change from the light quantity 0% to Lsm [%]. According to this duty ratio-light quantity characteristic table, the same duty as the duty Dsm (100%) corresponding to the light quantity Lsm can be derived in the region of the light quantity Lsm or more regardless of the magnitude of the light quantity. In the region where the light amount is lower than the light amount Lsm, for example, the duty Db can be derived as a duty corresponding to the brightness Lb.

The light source calibration processing unit 310 performs light source calibration processing, and acquires information specifying the relationship between the drive current and the output light amount of the light source, and the relationship between the duty ratio of the PWM signal and the output light amount of the light source.
The light source calibration processing unit 310 starts the light source calibration process when the accumulated lighting time of the light source and the operation time after starting the projector 100 satisfy a predetermined condition. This predetermined condition can be changed depending on the type of light source, the warm-up condition necessary for executing the light source calibration process, and the like. The cumulative lighting time of the light source and the operation time after starting up the projector 100 correspond to preset conditions.
In the present embodiment, the light source calibration process is executed in an end sequence in which the power of the projector 100 is turned off when the cumulative lighting time of the light source has passed a predetermined time (for example, 100 hours). Further, the user can operate the operation panel 141 or the remote controller 5 to execute the light source calibration process. Note that the end sequence is a series of operations executed to turn off the power of the projector 100 when an operation to instruct power off is performed, and may include a plurality of processes.
In addition, the light source calibration processing unit 310 uses the information acquired by the light source calibration processing before starting projection of the image data supplied from the image supply device 200 onto the screen SC, and A duty ratio-light quantity characteristic table is generated.

FIG. 5 is a flowchart showing the operation of the light source calibration processing unit 310.
In this processing flow, for example, the light source calibration processing unit 310 starts the light source calibration processing in an end sequence in which the power of the projector 100 is turned off when the accumulated lighting time of the light source has passed a predetermined time (for example, 100 hours). Then.

  The light source calibration processing unit 310 determines whether or not the cumulative lighting time of the light source has passed a predetermined time. If the light source calibration processing unit 310 determines that the cumulative lighting time of the light source has not passed the predetermined time, the light source calibration processing unit 310 does not start the light source calibration process (step S1 / NO). If the light source calibration processing unit 310 determines that the accumulated lighting time of the light source has passed the predetermined time, the light source calibration processing unit 310 starts the light source calibration process (step S1 / YES).

  First, the light source calibration processing unit 310 instructs the projection control unit 171 to project a black image. The projection control unit 171 reads the black image data stored in the storage unit 160 and controls the display unit 110 to display a black image based on the black image data on the screen SC. This is performed in order to prevent the user from visually recognizing the change in luminance because the luminance of the light projected on the screen SC changes by executing the light source calibration process.

Next, the light source calibration processing unit 310 designates the maximum value as the current value of the drive current supplied to the light source unit 111 in a state where the black image is displayed on the screen SC, and the duty ratio is 100% as the duty ratio of the PWM signal. Is generated and output to the setting unit 330 (step S2).
The setting unit 330 instructs the PWM signal generation unit 122 to generate a PWM signal having a duty ratio specified by the light source calibration processing unit 310. In addition, the setting unit 330 instructs the light source driving unit 121 to supply the light source unit 111 with a driving current having a current value specified by the light source calibration processing unit 310. As a result, the light source unit 111 is supplied with a drive current having a maximum current value (Imax shown in FIG. 4), a drive signal with a duty ratio of 100% is input, and the output light quantity of the light source is maximized. When the output light amount of the light source becomes maximum, the light source calibration processing unit 310 acquires a sensor value measured by the red light sensor 117R (step S3). The light source calibration processing unit 310 stores the acquired sensor value in a memory or storage unit 160 (not shown).

Next, the light source calibration processing unit 310 designates an intermediate value as the current value of the drive current supplied to the light source unit 111 and generates information for designating a duty ratio of 100% as the duty ratio of the PWM signal. Output (step S4). As the intermediate value, for example, an intermediate value (Ia shown in FIG. 4) between a preset maximum value and minimum value of the drive current can be used.
When the light source unit 111 is driven by a drive signal having an intermediate current value drive current and a duty ratio of 100%, the light source calibration processing unit 310 acquires a sensor value measured by the red light sensor 117R (Step S1). S5). The light source calibration processing unit 310 stores the acquired sensor value in a memory or storage unit 160 (not shown).

Next, the light source calibration processing unit 310 generates information specifying the minimum value as the current value of the drive current supplied to the light source unit 111 and specifying the duty ratio of 100% as the duty ratio of the PWM signal. Output (step S6).
When the light source unit 111 is driven by a drive signal having a minimum current value (Ism shown in FIG. 4) and a duty ratio of 100%, the light source calibration processing unit 310 is measured by the red light sensor 117R. A sensor value is acquired (step S7). The light source calibration processing unit 310 stores the acquired sensor value in a memory or storage unit 160 (not shown).

Next, the light source calibration processing unit 310 designates the minimum value as the current value of the drive current supplied to the light source unit 111, designates a preset duty ratio as the duty ratio of the PWM signal, and sends it to the setting unit 330. Output (step S8).
When the light source unit 111 is driven by a driving signal having a minimum current value (Ism shown in FIG. 4) and a driving signal having a duty ratio set in advance, the light source calibration processing unit 310 includes the red light sensor 117R. The sensor value measured by is acquired (step S9). The light source calibration processing unit 310 stores the acquired sensor value in a memory or storage unit 160 (not shown).

Next, the light source calibration processing unit 310 drives the light source unit 111 by designating all preset duty ratios, and determines whether or not the sensor value measured by the red light sensor 117R has been acquired (step S10). ).
If the determination in step S10 is negative, the light source calibration processing unit 310 proceeds to the process in step S8 and designates a preset duty ratio that is a preset duty ratio as the duty ratio of the PWM signal. The light source unit 111 is driven to acquire a sensor value measured by the red light sensor 117R (step S9).
Note that the drive current and the duty ratio of the PWM signal set in the above steps S2, S4, S6, and S8 correspond to the “plurality of drive conditions” of the present invention.

If the determination in step S10 is affirmative, the light source calibration processing unit 310 performs an error determination process (step S11). The light source calibration processing unit 310 compares the sensor value measured in steps S3, S5, S7, and S9 with the sensor value measured in the previous light source calibration process. For example, the storage unit 160 stores sensor values measured by the previous light source calibration process.
The light source calibration processing unit 310 compares the sensor value measured in the current light source calibration process with the sensor value measured in the previous light source calibration process, and calculates the change rate of the sensor value. When the calculated change rate is within a predetermined range set in advance, the light source calibration processing unit 310 determines that the sensor value measured in the current light source calibration processing is a value within the measurement error range. In this case, the light source calibration processing unit 310 discards the sensor value measured in the current light source calibration process, uses the sensor value measured in the previous light source calibration process, and uses the drive current-light quantity characteristic table and the duty The ratio-light quantity characteristic table is updated. Alternatively, the light source calibration processing unit 310 does not update the drive current-light quantity characteristic table and the duty ratio-light quantity characteristic table.

  When the light source calibration processing shown in FIG. 5 is completed, the light source calibration processing unit 310, based on the sensor value stored in the storage unit 160 or a memory (not shown), the driving current-light quantity characteristic table shown in the upper side of FIG. The duty ratio-light quantity characteristic table shown in the lower side of FIG. 4 is updated. The light source calibration processing unit 310 obtains the output light amount of the light source based on each of the sensor values of the red light sensor 117R measured while changing the drive current. FIG. 6 shows a light amount (Smax) when the drive current is the maximum value (Imax), a light amount (Smin) when the drive current is the intermediate value (Ia), and a light amount when the drive value is the minimum value (Imin). The state where (Smin) is plotted is shown.

The light source calibration processing unit 310 plots points corresponding to the obtained light quantity and driving current of the light source in the driving current-light quantity characteristic table, and further connects the plotted points with a straight line to obtain the driving current-light quantity characteristic table. Generate. The light source calibration processing unit 310 also generates a duty ratio-light quantity characteristic table by the same procedure.
The light source calibration processing unit 310 outputs the generated drive current-light quantity characteristic table to the setting unit 330 and updates the current setting LUT 332. Further, the light source calibration processing unit 310 outputs the generated duty ratio-light quantity characteristic table to the setting unit 330 and updates the PWM setting LUT 331.

Returning to FIG. 3, the configuration of the light source controller 172 will be described.
The light source drive parameter generation unit 320 receives, from the third luminance setting unit 303, instruction information that instructs to maintain the output light amount of the light source at a constant light amount and designation information that specifies the constant light amount to be maintained.
When the instruction information and the specific light quantity designation information are input, the light source drive parameter generation unit 320 generates a drive parameter for controlling the output light quantity of the light source to the constant light quantity designated by the designation information. The light source drive parameter generation unit 320 generates a drive parameter for controlling the output light amount of the light source to the designated light amount specified by the user even if the output light amount of the light source changes due to deterioration with time or usage environment.
The light source driving parameter generation unit 320 is configured to drive parameters based on the sensor value output from the red light sensor 117R and the sensor value stored in the storage unit 160 when the light source is driven under preset driving conditions. Is generated. The sensor value stored in the storage unit 160 corresponds to the light amount information of the present invention.
In this embodiment, a driving condition in which the output light amount of the light source is set to the maximum value, that is, the case where the current value of the driving current is set to the maximum value and the duty ratio of the PWM signal is set to 100% is selected as the preset driving condition To do. Further, as the sensor value stored in the storage unit 160 used for generating the drive parameter, the current value of the drive current measured in step S3 of the light source calibration process shown in FIG. 5 is the maximum value, and the duty ratio of the PWM signal Is used as the sensor value of the red light sensor 117R. In the present embodiment, the driving condition that maximizes the output light amount of the light source is selected as the driving condition set in advance. However, the driving parameter may be generated by driving the light source according to another driving condition.

FIG. 7 is a flowchart showing the operation of the light source control unit 172.
First, the light source control unit 172 determines whether or not the operation panel 141 or the remote controller 5 is operated and an operation for instructing the start of constant light amount control is received. The constant light amount control is an operation for controlling the output light amount of the light source to a constant light amount designated by the user.
The light source control unit 172 does not start this processing flow when an operation for instructing the start of constant light amount control is not received (step S21 / NO). When an operation for instructing the start of constant light amount control is received (step S21 / YES), the light source control unit 172 inputs designation information specifying the constant light amount received by the operation panel 141 or the remote controller 5 (step S22). ). In the present embodiment, information indicating the output light amount set for the light source as a percentage of the maximum light amount is used as the specification information. However, the specification information is not limited to this information, and the brightness of the light source is specified by a numerical value, for example. It may be information.
Instruction information for instructing to maintain the output light amount of the light source at a constant light amount and designation information for specifying the constant light amount are input to the third luminance setting unit 303 of the light source control unit 172. The third luminance setting unit 303 outputs the input instruction information and designation information to the light source drive parameter generation unit 320.

  When the instruction information and the designation information are input from the third luminance setting unit 303, the light source drive parameter generation unit 320 first acquires the reference light sensor value from the storage unit 160 (step S23). The reference light sensor value is a sensor value of the red light sensor 117R measured by the light source calibration process shown in FIG. The reference light sensor value is a sensor value measured by the red light sensor 117R when the light source unit 111 is driven with the drive current set to the maximum value and the duty ratio of the PWM signal set to 100%.

Next, the light source drive parameter generation unit 320 instructs the setting unit 330 to set the current value of the drive current to the maximum value and the duty ratio of the PWM signal to 100%. The setting unit 330 instructs the PWM signal generation unit 122 to generate a PWM signal having a duty ratio specified by the light source drive parameter generation unit 320. In addition, the setting unit 330 instructs the light source driving unit 121 to supply the light source unit 111 with a driving current having a current value specified by the light source calibration processing unit 310.
As a result, the light source unit 111 is supplied with a drive current having a maximum current value, and a drive signal having a duty ratio of 100% is input, so that the output light quantity of the light source is maximized. When the output light quantity of the light source becomes maximum, the light source drive parameter generation unit 320 acquires the sensor value measured by the red light sensor 117R. The sensor value acquired by the light source drive parameter generation unit 320 is hereinafter referred to as a measured value.

Next, the light source drive parameter generation unit 320 calculates a setting value set in the setting unit 330 (step S24). This set value is a set value for setting the output light amount of the light source to a constant light amount designated by the user. Hereinafter, this set value is referred to as a constant light amount output. The constant light amount output is calculated by the following formula.
Constant light output = constant light specified by the user x (reference light sensor value / measured value)

For example, it is assumed that the constant light amount designated by the user is 70%, and the sensor value of the reference light sensor acquired from the storage unit 160 is 700. It is also assumed that the measured value measured by the red light sensor 117R is 700.
In this case, the constant light amount output becomes 70% by 70% × (700/700). If the deterioration of the light source has not progressed and the measured value is the same as the reference light sensor value acquired by the light source calibration process, the constant light amount designated by the user becomes the constant light amount output as it is.

Further, it is assumed that the constant light amount designated by the user is 70%, the reference light sensor value acquired from the storage unit 160 is 700, and the measurement value is 612.
In this case, the constant light output is 80% by 70% × (700/612).

  The light source drive parameter generation unit 320 outputs the generated constant light amount output to the third luminance setting unit 303 as a drive parameter (step S25). The third luminance setting unit 303 outputs the drive parameter input from the light source drive parameter generation unit 320 to the switching unit 304 as the third drive parameter. For example, when 70% is specified as the constant light amount by the user, the third luminance setting unit 303 uses 80%, which is the constant light amount output generated by the light source drive parameter generation unit 320, as the third drive parameter. Output to. As the light amount of the light source deteriorates, the measurement value measured by the red light sensor 117R also decreases, so that the constant light amount output is changed to a large value.

Thereafter, the value indicated by the first drive parameter and the value indicated by the third luminance information are integrated by the integration unit 305, and the setting unit 330 calculates the current value of the drive current and the PWM signal based on the integration result of the integration unit 305. Get the duty ratio. The setting unit 330 instructs the PWM signal generation unit 122 to generate a PWM signal having the acquired duty ratio. In addition, the setting unit 330 instructs the light source driving unit 121 to supply the driving current having the acquired current value to the light source unit 111.
Accordingly, the drive current having the current value acquired by the setting unit 330 is supplied to the light source unit 111, the drive signal having the duty ratio acquired by the setting unit 330 is input, and the light source is turned on with a predetermined light amount.

  Next, the light source drive parameter generation unit 320 determines whether or not the light source calibration processing is performed by the light source calibration processing unit 310 and the measurement value is updated (step S26). If the determination in step S26 is affirmative (step S26 / YES), the light source drive parameter generation unit 320 proceeds to the process in step S24, re-acquires the updated measurement value, and repeats the processes in steps S24 to S26. . If the determination in step S26 is negative (step S26 / NO), the light source drive parameter generation unit 320 determines whether or not to end the constant light amount control (step S27). If the determination in step S27 is negative, the light source drive parameter generation unit 320 returns to the process in step S25 and outputs a constant light amount output (step S25). If the determination in step S27 is affirmative, the light source drive parameter generation unit 320 ends this processing flow.

As described above, in the embodiment to which the projector and the projector control method of the present invention are applied, the sensor value measured by the red light sensor 117R when the light source unit 111 is driven under a preset driving condition, Based on the light amount information stored in the storage unit 160, a drive parameter for setting the light amount of the emitted light of the light source to the set light amount is generated.
Therefore, the output light quantity of the light source unit 111 can be easily adjusted to the set light quantity by using the red light sensor 117R provided in the projector 100. For this reason, for example, when the amount of light emitted from the light source unit 111 deteriorates over time, it is possible to generate drive parameters corresponding to the deterioration of the light source.

The light source control unit 172 drives the light source unit 111 under a preset driving condition when a preset condition is satisfied, and the storage unit 160 stores the sensor value measured by the red light sensor 117R. The light quantity information to be updated is updated.
Accordingly, the light amount information stored in the storage unit 160 can be updated when a preset condition is satisfied.

In addition, the light source control unit 172 drives the light source unit 111 under a preset driving condition when the preset condition is satisfied and the light amount information stored in the storage unit 160 is updated, and the red light sensor 117R. The drive parameter is generated again based on the sensor value measured in step 1 and the light amount information stored in the storage unit 160.
Therefore, when the light amount information stored in the storage unit 160 is updated, the drive parameter can be generated again based on the updated light amount information.

The projector 100 also includes a color separation unit 112 that separates the emitted light emitted from the light source unit 111 into a plurality of color lights.
The red light sensor 117R detects the amount of red light among a plurality of color lights.
The light source control unit 172 generates a drive parameter based on the R light sensor value measured by the red light sensor 117R and the R light amount information stored in the storage unit 160.
Accordingly, it is possible to generate a drive parameter based on the amount of red light among the plurality of color lights separated by the color separation unit 112. Since the R light is a color light that most reflects the brightness of the light source among the plurality of color lights, a drive parameter that reflects the brightness of the light source of the light source unit 111 can be generated.

Further, the light source control unit 172 measures the red light sensor 117R when the light source unit 111 is driven under a plurality of driving conditions when a preset condition is satisfied and the light source is driven under each driving condition. Based on the sensor value, a driving parameter for driving the light source driving unit 121 is calculated for each of a plurality of driving conditions.
Therefore, when the amount of light emitted from the light source unit 111 has deteriorated over time, a drive parameter corresponding to the deterioration of the light source can be generated for each drive condition.

The light source control unit 172 changes the driving current for driving the light source unit 111 and the duty of the PWM signal for switching on / off of the light source unit 111 as a plurality of driving conditions, and drives the light source driving unit 121. The driving parameter to be calculated is calculated for each of a plurality of driving conditions.
Accordingly, it is possible to generate drive parameters under a plurality of drive conditions by changing either the drive current or the duty of the PWM signal to change the light amount of the light source unit 111.

The projector 100 also includes an image input I / F unit 151 for inputting image data. The light source control unit 172 is based on the drive parameters of the light source driving unit 121 for setting the light amount of the emitted light of the light source unit 111 to the set light amount and the luminance of the image data input to the image input I / F unit 151. The light quantity of the light source unit 111 is controlled based on the calculated drive parameter.
Therefore, the light amount of the light source unit 111 can be controlled based on the brightness of the image data and the drive parameters of the light source driving unit 121 for setting the light amount of the emitted light of the light source unit 111 to the set light amount.

In addition, the light source control unit 172 generates drive parameters for the light source drive unit 121 in a power-off sequence executed when the projector 100 is powered off.
Therefore, it is possible to reduce the influence on other operations of the projector 100 when generating the drive parameter.

In addition, the projector 100 includes an operation panel 141 or a remote controller 5 that receives an operation. The light source control unit 172 generates drive parameters for the light source drive unit 121 at a timing specified by an input received from the operation panel 141 or the remote controller 5.
Therefore, the user can generate drive parameters by operating the operation panel 141 or the remote controller 5.

The above-described embodiment is a preferred embodiment of the present invention. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the example in which the drive parameter is generated based on the sensor value of the red light sensor 117R has been described. However, the drive parameter is generated using the sensor value of the red light sensor 117R and the blue light sensor 117B. May be. For example, when three solid light sources of red, green, and blue are provided as solid light sources, the drive parameters may be generated using the sensor values of the red light sensor 117R and the blue light sensor 117B.

  In the above-described embodiment, the light modulation device 113 that modulates the light emitted from the light source has been described by taking as an example a configuration using three transmissive liquid crystal panels corresponding to each color of RGB. The invention is not limited to this. For example, a configuration using three reflective liquid crystal panels may be used, or a method in which one liquid crystal panel and a color wheel are combined may be used. Alternatively, a system using three digital mirror devices (DMD), a DMD system combining one digital mirror device and a color wheel, or the like may be used. When only one liquid crystal panel or DMD is used as the light modulation device, a member corresponding to a synthetic optical system such as a cross dichroic prism is unnecessary. In addition to the liquid crystal panel and the DMD, any light modulation device capable of modulating light emitted from the light source can be employed without any problem.

In the above-described embodiment, the front projection type projector 100 that projects from the front of the screen SC is shown as the projector 100, but the present invention is not limited to this.
Each functional unit shown in FIG. 1 indicates a functional configuration, and a specific mounting form is not particularly limited. That is, it is not always necessary to mount hardware corresponding to each function unit individually, and it is of course possible to adopt a configuration in which the functions of a plurality of function units are realized by one processor executing a program. In addition, in the above embodiment, a part of the function realized by software may be realized by hardware, or a part of the function realized by hardware may be realized by software. In addition, the specific detailed configuration of each other part of the projector 100 can be arbitrarily changed without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 5 ... Remote control (reception part), 100 ... Projector, 111 ... Light source part (light source), 112 ... Color separation part (separation optical system), 113 ... Light modulation apparatus, 114 ... Projection optical system, 115R, 115B, 115B ... Liquid crystal Panel, 116R, 116G, 116B ... Condensing lens, 117 ... Photo sensor (detection unit), 117B ... Blue light sensor, 117R ... Red light sensor, 118 ... Cross dichroic prism, 121 ... Light source drive unit, 122 ... PWM signal generation , 123: Light modulation device drive unit, 131, 132 ... Dichroic mirror, 133, 134, 135 ... Reflection mirror, 136, 137 ... Relay lens, 141 ... Operation panel (receiving unit), 142 ... Remote control light receiving unit (receiving unit) , 143... Input processing unit, 145... Wireless communication unit, 151... Image input I / F unit (input unit), 15 ... Image processing unit, 155 ... Frame memory, 160 ... Storage unit, 170 ... Control unit, 171 ... Projection control unit, 172 ... Light source control unit, 180 ... Internal bus, 200 ... Image supply device, 301 ... First luminance setting unit , 302 ..., second luminance setting unit, 303 ... third luminance setting unit, 304 ... switching unit, 305 ... integration unit, 310 ... light source calibration processing unit, 320 ... light source drive parameter generation unit, 330 ... setting unit, 331 ... PWM setting unit, 332 ... current setting LUT, SC ... screen.

Claims (10)

A light source;
A light source driving unit for driving the light source;
A detection unit for detecting the amount of light emitted from the light source;
A storage unit for storing light amount information indicating a light amount detected by the detection unit when the light source is driven under a preset driving condition;
Based on the detection value detected by the detection unit and the light amount information stored in the storage unit when the light source is driven under a driving condition set in advance in the light source drive unit, the emission light of the light source A light source control unit that generates a drive parameter of the light source drive unit for setting the light amount to a set light amount;
A projector comprising:   The light source control unit drives the light source under a preset driving condition when a preset condition is satisfied, and the light quantity stored in the storage unit by the light quantity information indicating the light quantity detected by the detection unit The projector according to claim 1, wherein the information is updated.   The light source control unit detects the detection detected by the detection unit by driving the light source under a preset driving condition when a preset condition is satisfied and the light amount information stored in the storage unit is updated. The projector according to claim 2, wherein the drive parameter is generated again based on the value and the light amount information stored in the storage unit. A separation optical system that separates the emitted light emitted from the light source into a plurality of color lights,
The detection unit detects the amount of red light among a plurality of color lights,
The said light source control part produces | generates a drive parameter based on the detection value of the red light detected by the said detection part, and the light quantity information of the red light memorize | stored in the said memory | storage part. The projector according to any one of 1 to 3.   The light source control unit drives the light source under a plurality of driving conditions when a preset condition is satisfied, and based on the light amount detected by the detection unit when the light source is driven under each driving condition. The projector according to claim 1, wherein a driving parameter for driving the light source driving unit is calculated for each of the plurality of driving conditions.   The light source control unit drives the light source driving unit by changing one of a driving current for driving the light source and a duty of a PWM signal for switching on and off of the light source as the plurality of driving conditions. The projector according to claim 5, wherein a driving parameter to be calculated is calculated for each of the plurality of driving conditions. An input unit for inputting image data is provided.
The light source control unit includes a driving parameter of the light source driving unit for setting a light amount of light emitted from the light source to a set light amount, and a parameter calculated based on luminance of image data input to the input unit; The projector according to claim 1, wherein the light amount of the light source is controlled based on the above.   The said light source control part produces | generates the drive parameter of the said light source drive part in the power-off sequence performed when turning off the power supply of the said projector, The one of Claim 1 to 7 characterized by the above-mentioned. projector. Having a reception unit to accept input,
The projector according to claim 1, wherein the light source control unit generates a driving parameter of the light source driving unit at a timing specified by an input received by the receiving unit. Driving the light source under a preset driving condition, and detecting the amount of emitted light emitted from the light source;
Storing light amount information indicating the detected light amount of the emitted light in the storage unit;
The light source is driven under preset driving conditions, the light amount of the emitted light emitted from the light source is detected, and based on the detected value and the light amount information stored in the storage unit, the light source of the light source is detected. Generating a drive parameter for setting the light amount of the emitted light to a set light amount;
A projector control method comprising:

Images