JP2015087574A - Projector, and control method of projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector and a control method of the projector, that can make a level of luminance of an image to be projected or a difference in the luminance thereof easily recognizable by a user.SOLUTION: A projector 1 comprises: storage means 21 for storing a plurality of luminance setting values as luminance setting information 211; light source control means 25 for plurally generating drive power for driving a light source 11 on the basis of the plurality of luminance setting values; and luminance setting means 202 for controlling actions of the light source control means 25. When an image signal is detected after power is turned on or the image signal is detected after a change-over of an image input is performed, on the basis of the luminance setting information 211 of the storage means 21, the luminance setting means 202 allows the light source control means 25 to generate the drive power at a prescribed time through switching, and to project the image.

Description

  The present invention relates to a projector and a projector control method.

  2. Description of the Related Art Conventionally, projectors that modulate and project light emitted from a light source device according to image information are known. In such a projector, the brightness setting of the light source device may be changed depending on the surrounding environment (brightness, etc.), the projection size, the content of the projected image, and the like. In order to change the brightness setting, it is common to display the menu setting screen provided in the projector and change the brightness setting.

  Patent Document 1 discloses a projector that automatically adjusts the brightness of a projected image according to the distance between the screen and the projector and displays the projected image with the optimum brightness according to the installation environment.

  In Patent Document 2, the light source brightness is set to the minimum brightness, the test image projected on the projection surface is captured, and the light source brightness is increased step by step until the character recognition unit can correctly recognize the character string included in the test image. A projector is disclosed that can be adjusted to a brightness that improves visibility by making it brighter.

JP 2008-203490 A JP 2011-203516 A

  However, in the projector disclosed in Patent Document 1, the brightness is automatically adjusted so that the brightness is set in advance according to the projection distance and the operation mode (home theater mode, energy saving mode, etc.). Depending on the environment, the projection size, the content, etc., there is a problem that the brightness desired by the user is not always obtained. Also in the projector of Patent Document 2, since the brightness is automatically adjusted so that the character recognition unit can correctly recognize the content of the projected test image using the test image, similarly to the projector of Patent Document 1. However, there is a problem that the luminance is not necessarily desired by the user.

In addition, when the user changes the luminance (brightness setting), there is a problem that the luminance level and the difference in luminance cannot be known unless the luminance is set for the actually projected image and the image is projected and confirmed. there were. Further, the operation of setting and projecting the luminance is complicated, and there is a problem that it is not easy to compare the luminance levels of the projected images while the user performs the operation.
Accordingly, there has been a demand for a projector and a projector control method that make it easy for the user to recognize the brightness level and the brightness difference of the projected image, and can approach the brightness desired by the user.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A projector according to this application example is a projector that modulates and projects light emitted from a light source device based on image information, and stores a plurality of luminance setting values as luminance setting information. And a light source control means for generating a plurality of drive powers for driving the light source device based on a plurality of brightness setting values, and a brightness setting means for controlling the operation of the light source control means. When an image signal is detected after being turned on, or when an image signal is detected after image input switching, based on the luminance setting information of the storage means, the light source control means is switched and generated for a predetermined time to generate an image. The projection is performed.

  According to such a projector, the brightness setting means can adjust the drive power for a predetermined time based on the brightness setting information when an image signal is detected after the power is turned on or when an image signal is detected after the image input is switched. The light source device is driven by switching to generate an image. As a result, the projector can sequentially project the actual image to be projected by switching the brightness based on a plurality of brightness setting values. It can be made easy to recognize. Moreover, it can be close to the brightness desired by the user.

  Application Example 2 The projector according to the application example described above includes an input operation unit that instructs the luminance setting unit to perform an operation by an input operation, and the luminance setting is performed in a state where the light source device is driven and projected by switching the driving power. When the means detects an input operation by the input operation means, it is preferable that the light source control means generates drive power based on the luminance setting value when the input operation is detected, and starts image projection.

  According to such a projector, when an input operation is detected in a state where the driving power is switched and the light source device is driven and projected, the driving power is generated based on the brightness setting value when the input operation is detected. And start projecting the image. As a result, the user can recognize the brightness level and the difference in brightness, and perform projection with the desired brightness by performing an input operation when the brightness is projected with the desired brightness. Therefore, the user can easily set the desired luminance.

  Application Example 3 The projector according to the application example described above includes an input operation unit that instructs the luminance setting unit to perform an operation by an input operation, and the luminance setting is performed in a state where the light source device is driven and projected by switching the driving power. When the means does not detect an input operation by the input operation means, it is preferable that the light source control means generates drive power based on a predetermined luminance setting value based on the luminance setting information and starts projecting an image.

  According to such a projector, when the input operation is not detected in the state where the driving power is switched and the light source device is driven and projected, the driving power is set based on the predetermined luminance setting value based on the luminance setting information. Generate and start projecting the image. Thus, the user can start projection without setting the brightness.

  Application Example 4 In the projector according to the application example described above, it is preferable that the predetermined luminance setting value based on the luminance setting information is set to a luminance setting value that provides the lowest luminance among the luminance setting values.

  According to such a projector, when the luminance setting by the user is not performed, the image setting is started with the luminance setting value set to the minimum luminance. Thereby, the power consumption of the projector by projection can be reduced, and the energy saving effect can be improved.

  Application Example 5 A projector control method according to this application example is a projector control method for projecting light emitted from a light source device by modulating light based on image information, and setting a plurality of brightness setting values as brightness settings. Storage means for storing as information, light source control means for generating a plurality of drive powers for driving the light source device based on a plurality of brightness setting values, and brightness setting means for controlling the operation of the light source control means, Based on an image signal detection step for detecting an image signal after power-on or an image signal after image input switching, a measurement step for measuring a predetermined time when an image signal is detected, and luminance setting information of the storage means, A luminance switching step for switching driving power to be generated at a predetermined time; and a projection step for projecting an image with the driving power generated by switching. And features.

  According to such a projector control method, an image signal after power-on or an image signal after image input switching is detected in the image signal detection step, and a predetermined time is set when the image signal is detected in the measurement step. In the luminance switching step, the driving power is switched and generated in a predetermined time in the luminance switching step, and in the projection step, the image is projected by the driving power generated by switching. With such a projector control method, the projector can sequentially project the actual image to be projected by switching the brightness based on a plurality of brightness setting values. It is possible to make the user easily recognize the difference in luminance. Moreover, it can be close to the brightness desired by the user.

1 is a block diagram showing a circuit configuration of a projector according to an embodiment. The figure which shows the transition of the projection image according to the operation state at the time of the brightness | luminance switching of a projector. The flowchart which shows the operation | movement at the time of the brightness | luminance switching of a projector.

Hereinafter, embodiments will be described with reference to the drawings.
Embodiment

FIG. 1 is a block diagram illustrating a circuit configuration of a projector 1 according to the embodiment.
As shown in FIG. 1, the projector 1 includes an image input terminal 6, an image projection unit 10, an OSD processing unit 16, an image signal processing unit 17, an image signal input unit 18, an image signal detection unit 19, a control unit 20, and a storage unit. 21, an input operation means 23, a light source control means 25, a power supply terminal 30, a power supply unit 31, and the like, which are arranged inside or outside the exterior casing of the projector 1.

  The image projection means 10 includes a light source device 11, three liquid crystal light valves 12R, 12G, and 12B, a projection lens 13, a liquid crystal drive means 14, and the like. The image projection means 10 modulates the light emitted from the light source device 11 with the liquid crystal light valves 12R, 12G, and 12B, and projects the modulated image from the projection lens 13 to project the projected image on the projection surface such as the screen SC. Display as.

  The light source device 11 includes a discharge-type light source lamp 11a such as an ultra-high pressure mercury lamp or a metal halide lamp, and a reflector 11b that reflects light emitted from the light source lamp 11a toward the liquid crystal light valves 12R, 12G, and 12B. ing. The light emitted from the light source device 11 is converted into light having a substantially uniform luminance distribution by an integrator optical system (not shown), and red (R) and green, which are the three primary colors of light, by a color separation optical system (not shown). After being separated into light components of each color (G) and blue (B), they are incident on the corresponding liquid crystal light valves 12R, 12G, and 12B.

  The liquid crystal light valves 12R, 12G, and 12B are configured by a liquid crystal panel in which liquid crystal is sealed between a pair of transparent substrates. In the liquid crystal light valves 12R, 12G, and 12B, a plurality of pixels (not shown) arranged in a matrix are formed, and a driving voltage can be applied to the liquid crystal for each pixel.

  When the driving voltage corresponding to the image data input by the liquid crystal driving unit 14 is applied to each pixel, each pixel is set to a light transmittance corresponding to the image information. Therefore, the light emitted from the light source device 11 is modulated by transmitting through the liquid crystal light valves 12R, 12G, and 12B, and image light corresponding to image information is formed for each color light. The formed image light of each color is synthesized for each pixel by a color synthesis optical system (not shown) to become color image light, and then enlarged and projected onto the screen SC or the like by the projection lens 13.

  In the present embodiment, a discharge light source is used as the light source device 11. However, a solid light source may be used as the light source device. As the solid light source, various solid light emitting elements such as a laser light source, an LED (Light Emitting Diode), an organic EL (Electro Luminescence) element, and a silicon light emitting element may be used.

  In the present embodiment, the image projection unit 10 exemplifies a transmissive liquid crystal type projection optical system using the three liquid crystal light valves 12R, 12G, and 12B as a light modulation device, but a reflective liquid crystal display method or a micromirror device. You may employ | adopt the projection optical system using the light modulation apparatus of other display systems, such as a system (light switch display system).

  The control unit 20 includes a CPU (Central Processing Unit) (not shown), a RAM (Random Access Memory) used for temporary storage of various data, and the like, and operates according to a control program (not shown) stored in the storage unit 21. By doing so, the overall operation of the projector 1 is controlled. The control means 20 functions as a so-called computer together with the storage means 21.

  In this embodiment, the control unit 20 includes a timer 201 that measures elapsed time and a luminance setting unit 202 that controls the operation of the light source control unit 25. When an image signal is detected, the luminance setting unit 202 drives the light source device 11 by causing the light source control unit 25 to switch and generate the driving power for a predetermined time based on the luminance setting information 211 of the storage unit 21. Details of the operations of the luminance setting means 202 and the timer 201 will be described later.

  The storage means 21 is composed of a rewritable nonvolatile memory such as a flash memory or FeRAM (Ferroelectric RAM). The storage unit 21 stores a control program for controlling the operation of the projector 1, various setting information (setting data) that defines the operation conditions of the projector 1, and the like.

  In the present embodiment, the storage unit 21 stores a control program for the luminance setting unit 202 to control the operation of the light source control unit 25. The storage unit 21 stores information on a plurality of brightness setting values as brightness setting information 211. In the present embodiment, the luminance setting information 211 is stored including two luminance setting values, ie, a luminance setting value for low luminance and a luminance setting value for high luminance.

  The input operation means 23 includes an operation panel (not shown) for the user to give various instructions to the projector 1. The operation panel is provided on the outer surface of the exterior housing of the projector 1 and includes a plurality of operation keys.

  The operation keys provided in the input operation means 23 (operation panel) include a power key for alternately switching on and off the power supply, and input switching for switching a plurality of image input terminals 6 input to the image signal input means 18. There are a key, a menu key for superimposing a setting menu for performing various settings, a cursor key for selecting a setting item from the menu, a determination key, an escape key, and the like.

  When the user operates various operation keys of the input operation unit 23, the input operation unit 23 outputs an operation signal corresponding to the operation content of the user to the control unit 20. The input operation unit 23 may include a receiving unit (not shown) that receives a signal from a remote controller (not shown) that can be remotely operated. In this case, the remote controller transmits an operation signal such as an infrared ray corresponding to the operation content of the user, and the receiving means receives this and transmits it to the control means 20 as control information.

  The image signal input means 18 receives image information from an external image output device such as a video reproduction device or a PC (personal computer) via a cable and a plurality of image input terminals 6 connecting the cables. The input image information is output to the image signal processing unit 17 based on an instruction from the control unit 20. The image signal input means 18 may be configured to include receiving means (not shown) such as wireless communication and optical communication, and to input an image signal wirelessly from an external device.

  The image signal detection unit 19 notifies the control unit 20 of the detection result of whether or not an image signal is input to the image input terminal 6 selected by the image signal input unit 18.

  The image signal processing means 17 converts the image information input from the image signal input means 18 into image information representing the gradation of each pixel of the liquid crystal light valves 12R, 12G, and 12B. Here, the converted image information is classified into red (R), green (G), and blue (B) color lights, and a plurality of pixels corresponding to all the pixels of the liquid crystal light valves 12R, 12G, and 12B. Consists of values. The pixel value defines the light transmittance of the corresponding pixel, and the intensity (gradation) of light transmitted through each pixel and emitted through the pixel is defined by the pixel value.

  The OSD processing unit 16 performs processing for superimposing and displaying an OSD (On-Screen Display) image such as a menu image or a message image on the projection image based on an instruction from the control unit 20. The OSD processing means 16 includes an OSD memory (not shown), and stores OSD image information representing graphics, fonts, and the like for forming an OSD image.

  When the control unit 20 instructs to superimpose the OSD image, the OSD processing unit 16 reads necessary OSD image information from the OSD memory, and outputs an image signal so that the OSD image is superimposed at a predetermined position on the projected image. The OSD image information is synthesized with the image information input from the processing means 17. The image information combined with the OSD image information is output to the liquid crystal driving means 14. When there is no instruction to superimpose the OSD image from the control unit 20, the OSD processing unit 16 outputs the image information input from the image signal processing unit 17 to the liquid crystal driving unit 14 as it is.

  When the liquid crystal driving unit 14 drives the liquid crystal light valves 12R, 12G, and 12B according to the image information input from the OSD processing unit 16, the liquid crystal light valves 12R, 12G, and 12B form image light corresponding to the image information. The image light is combined by a cross dichroic prism (not shown) and projected from the projection lens 13.

  The light source control unit 25 controls the supply and stop of driving power to the light source device 11 based on an instruction from the control unit 20, and switches between turning on and off the light source device 11.

  In this embodiment, the light source control unit 25 generates a plurality of driving powers corresponding to a plurality of luminance setting values based on an instruction from the luminance setting unit 202 and supplies the generated driving power to the light source device 11. In the present embodiment, the light source control means 25 generates two drive powers having a low luminance and a high luminance at the time of activation, and supplies them to the light source device 11 alternately. Thereby, the light source device 11 emits light alternately so as to have two luminances, low luminance and high luminance. Then, the projected image is alternately projected with low luminance and high luminance by the image projection means 10.

  The power supply unit 31 is supplied with electric power such as AC 100V from the outside via the power supply terminal 30. The power supply unit 31 converts input power (AC power) into predetermined DC power and supplies the converted power to each unit of the projector 1. In addition, the power supply unit 31 stops supplying power (operating power) necessary for image projection to each unit (power-on state) and operating power supply based on an instruction from the control unit 20. It is possible to switch between a state (standby state) of waiting for an operation for turning on.

FIG. 2 is a diagram illustrating the transition of the projected image according to the operation state when the luminance of the projector 1 is switched.
FIG. 2A shows the projector 1 in a standby state or a state where no image signal is input.

FIG. 2B is a diagram showing a projected image G1 in a state of being projected with high brightness.
From the state shown in FIG. 2A, when the power is turned on by operating the power key of the input operation means 23, the image transitions to the projected image G1 when an image signal is input. In addition, even when input switching is performed from the state illustrated in FIG. 2A by an input switching key operation of the input operation unit 23 and a switched image signal is input, as illustrated in FIG. 2B. Transition to the projected image G1.

  In the present embodiment, two brightness setting values of high brightness and low brightness are stored as the brightness setting information 211 stored in the storage unit 21. The initial luminance setting value is a luminance setting value that provides high luminance. Therefore, in the present embodiment, the projected image G1 is projected with the driving power generated based on the initial luminance setting value (the luminance setting value that increases the luminance), and thus becomes a high luminance image.

  As shown in FIG. 2B, a message image corresponding to the projection with high luminance is superimposed on the actually projected image and projected onto the projected image G1. In the present embodiment, image data (character string) of “high luminance: luminance determination with [ENT]” is superimposed as a message image corresponding to projection with high luminance.

  When superimposing the message image on the image to be projected, the OSD processing unit 16 reads out the image data to be superimposed on the message image from the OSD memory and superimposes it on the image data input from the image signal processing unit 17.

FIG. 2C is a diagram showing a projected image G2 in a state of being projected at a low luminance.
From the state in which the projected image G1 shown in FIG. 2B is projected, in the present embodiment, when the time T1 has elapsed as the predetermined time, the transition to the projected image G2 is made by the timer 201. In the present embodiment, the projected image G2 is projected with the driving power generated based on the next brightness setting value (the brightness setting value that results in low brightness), and thus becomes a low brightness image.

  As shown in FIG. 2C, a message image corresponding to low-luminance projection is superimposed on the actually projected image and projected onto the projected image G2. In the present embodiment, image data (character string) “low luminance: luminance determination by [ENT]” is superimposed as a message image corresponding to projection at low luminance.

  In the present embodiment, the driving power is switched alternately so that the luminance becomes high and low every time T1 elapses. Therefore, the projected images G1 and G2 are alternately projected every time T1 elapses. Further, in the present embodiment, the images are sequentially projected until the number of times of switching to the projection images G1 and G2 (the number of times the projection images G1 and G2 are projected) reaches a predetermined number.

  As described above, in the present embodiment, the projected images G1 and G2 are sequentially projected (alternately projected) at a predetermined number of times every predetermined time (time T1), so that the brightness of the actually projected image is given to the user. This makes it easy to recognize differences in level and brightness.

FIG. 2D is a diagram illustrating the projected image G3 in a state where the luminance is determined. “Selected luminance” of the projection image G3 indicates that the luminance is selected, and such a character string is not actually displayed.
When a predetermined operation key (decision key) is operated from the state in which the projected image G1 shown in FIG. 2B is projected or the state in which the projected image G2 shown in FIG. 2C is projected Transition to the projected image G3. The projected image G3 is projected after being set to the brightness setting value (drive power) when an operation is performed with a predetermined operation key (decision key) (when the brightness is determined).

  In the present embodiment, when an operation with the enter key is performed in a state where a projection image G1 having high luminance is being projected, the luminance setting value that provides high luminance is set and projected as a projection image G3. . In addition, when an operation with the enter key is performed in a state where a projected image G2 having low brightness is being projected, the brightness setting value for reducing brightness is set and projected as a projected image G3. Thus, the brightness of the projected image G3 varies depending on the selected brightness (brightness setting value). Projected image G3 in FIG. 2D shows a state in which low luminance is set. Hereafter, projection is started with the driving power based on the selected luminance setting value.

  As a result, the user confirms the brightness level and brightness difference of the image to be actually projected, and sets the desired brightness by operating the decision key in the projected images G1 and G2 close to the desired brightness. Can do.

  Even when the number of times of switching to the projected image G1 and the projected image G2 is a predetermined number of times, even when an operation with a predetermined operation key (decision key) is not performed, the transition is made to the projected image G3. In this case, in the present embodiment, the projected image G3 is projected with the luminance setting value at a low luminance set as the predetermined luminance setting value.

  As a result, the luminance can be set even when the user does not operate the enter key. Further, since the luminance is set to be low, the power consumption of the projector 1 by projection can be reduced, and the energy saving effect can be improved.

FIG. 3 is a flowchart showing the operation of the projector 1 when switching the luminance.
As shown in FIG. 3, when the projector 1 is in a standby state and is turned on by a power key operation of the input operation means 23 (step S100), the process proceeds to step S101.

  In step S101, the luminance setting unit 202 instructs the light source control unit 25 to turn on the light source device 11 with driving power corresponding to the luminance setting value that is the luminance set at the previous projection. Next, the process proceeds to step S104.

  In the present embodiment, the process also proceeds to step S104 also in steps S102 and 103. Specifically, when the input switching key is operated while the projector 1 is operating (step S102), the projector 1 is switched to the selected terminal among the image input terminals 6 (step S103), and the process proceeds to step S104.

  In step S <b> 104, the luminance setting unit 202 determines whether an image signal is detected based on the detection result of the image signal detection unit 19. If an image signal is detected (step S104: Y), the process proceeds to step S105. If no image signal is detected (step S104: N), the process proceeds to step S120. Here, step S104 corresponds to an image signal detection step.

  In step S105, the luminance setting unit 202 sets the initial luminance (initial luminance setting value) in the luminance setting information 211, and instructs the light source control unit 25 to generate driving power so as to achieve this luminance. . Then, the light source control means 25 drives and projects the light source device 11 with the generated driving power. Next, the process proceeds to step S106.

  Note that the initially set luminance (initial luminance setting value) is a luminance setting value that provides high luminance in the present embodiment, and as shown in FIG. Projected.

  In step S <b> 106, the luminance setting unit 202 starts measurement by the timer 201. Next, the process proceeds to step S107. Here, step S106 corresponds to a measurement step.

  In step S107, the luminance setting unit 202 checks whether or not an operation (input operation) by a predetermined operation key (decision key) of the input operation unit 23 has been performed. Specifically, it is checked whether or not the user's operation of the enter key (luminance selection operation) has been detected for the projection image G1 having the luminance setting value that provides high luminance.

  If the operation of the enter key is detected (the brightness selection operation is detected) (step S107: Y), the process proceeds to step S130. When the operation of the enter key is not detected (the luminance selection operation is not detected) (step S107: N), the process proceeds to step S108.

  In step S108, the brightness setting unit 202 checks whether or not the measurement by the timer 201 has passed a time T1 (for example, 3 seconds) as a predetermined time. Here, step S108 corresponds to a measurement step.

  When the timer 201 has passed the time T1 (step S108: Y), the process proceeds to step S109. When the timer 201 has not passed the time T1 (step S108: N), the process proceeds to step S107. In addition, when transfering to step S107, the operation | movement of whether the brightness | luminance selection operation was detected is repeated.

  In step S109, the luminance setting unit 202 instructs the light source control unit 25 to switch to the next luminance (luminance setting value) in the luminance setting information 211 and generate the driving power corresponding to the switched luminance setting value. Then, the light source control means 25 drives and projects the light source device 11 with the generated driving power. Next, the process proceeds to step S110. Here, step S109 corresponds to a luminance switching step.

  In this embodiment, as the next luminance setting value, an instruction is given to switch to the low luminance setting value and generate drive power corresponding to the low luminance setting value, as shown in FIG. In addition, a projected image G2 having a low luminance is projected.

  In step S110, the brightness setting unit 202 checks whether or not the number of times the brightness has been switched (the number of times each of the projected images G1 and G2 has been projected) has reached a predetermined number. In the present embodiment, the predetermined number of times is 3 times. Therefore, it is checked whether or not the projected image G1 and the projected image G2 are projected three times each.

  When the predetermined number of times (three times) is reached (step S110: Y), the process proceeds to step S111. If the predetermined number of times (three times) has not been reached (step S110: N), the process proceeds to step S106.

  Here, if the number of times has not reached the predetermined number and the process proceeds to step S106, the operation from step S106 to step S109 is repeated until the luminance is selected or the number of times of luminance switching reaches the predetermined number.

  In step S110, when the predetermined number of times (three times) is reached without selecting the luminance by the enter key, the luminance setting unit 202 sets the predetermined luminance setting value by the luminance setting information 211, and the process proceeds to step S111. Transition. Specifically, in the present embodiment, the predetermined luminance setting value is set to a luminance setting value that results in low luminance.

  In step S111, the brightness setting unit 202 instructs the light source control unit 25 to drive corresponding to the brightness setting value set in step S110 and the brightness setting values set in steps S120 and S130 described below. Generate power (switch to set brightness). In step S112, the luminance setting unit 202 drives the light source device 11 with the generated driving power and starts image projection. Note that step S112 corresponds to a projection step.

  Here, it returns to step S104, and when not detecting an image signal (step S104: N), it transfers to step S120. In step S120, the luminance setting unit 202 sets a predetermined luminance setting value based on the luminance setting information 211. Specifically, in the present embodiment, the predetermined luminance setting value is set to a luminance setting value that results in low luminance. And it transfers to step S111 and step S112 which were mentioned above.

Returning to step S107, if the luminance selection operation is detected (the enter key is operated) (step S107: Y), the process proceeds to step S130. In step S130, the luminance setting unit 202 sets (sets to the selected luminance) the luminance setting value when the input operation with the enter key is detected. And it transfers to step S111 and step S112 which were mentioned above.
Thus, the operation flow ends.

According to the embodiment described above, the following effects can be obtained.
In the projector 1 according to the present embodiment, the brightness setting unit 202 is configured to perform a predetermined time based on the brightness setting information 211 when an image signal is detected after the power is turned on or when an image signal is detected after input switching of the image signal. The light source device 11 is driven by switching the drive power at a predetermined number of times (3 times) every (time T1: 3 seconds). As a result, the projector 1 can alternately switch between high luminance and low luminance with respect to the actual image to be projected, so that the luminance level of the actually projected image (projected images G1, G2) It is possible to make the user easily recognize the difference in luminance. Moreover, it can be close to the brightness desired by the user.

  In the projector 1 according to the present embodiment, the brightness setting unit 202 switches the driving power and drives the light source device 11 to project and detects an input operation using the enter key. Drive power is generated based on the brightness setting value, and image projection is started. As a result, the user can recognize the brightness level and the difference in brightness, and perform projection with the desired brightness by performing an input operation when the brightness is projected with the desired brightness. Therefore, the user can easily set the desired luminance.

  In the projector 1 according to the present embodiment, the brightness setting unit 202 uses the brightness setting information 211 when the input operation with the enter key is not detected in a state where the driving power is switched and the light source device 11 is driven and projected. Drive power is generated based on a predetermined brightness setting value, and image projection is started. Thus, the user can start projection without setting the brightness. Further, in the present embodiment, when the input operation with the enter key is not detected, the predetermined luminance setting value is set to a luminance setting value that results in low luminance, so that the power consumption of the projector 1 by projection can be reduced. It is possible to improve the energy saving effect.

  In the projector 1 according to the present embodiment, the luminance setting unit 202, when no image signal is detected after the power is turned on or after the input switching operation, in the present embodiment, a luminance setting that provides a low luminance as a predetermined luminance setting value. Since the value is set, the power consumption of the projector 1 by projection can be reduced, and the energy saving effect can be improved.

  In the projector 1 according to the present embodiment, it is possible to make the user easily recognize the luminance level and the luminance difference of the actually projected image, so that the convenience in the luminance setting of the projector 1 can be improved.

  Note that the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made without departing from the scope of the invention. A modification will be described below.

  In the projector 1 of the embodiment, the luminance setting information 211 stores two luminance setting values, high luminance and low luminance. However, the present invention is not limited to this, and it may be set to store three or more luminance setting values. In this case, the luminance switching may be performed so that the luminance setting value is sequentially increased from the luminance setting value having the lowest luminance among the plurality of luminance setting values, or vice versa.

  In addition, when storing three or more luminance setting values, when the driving power is switched and the light source device 11 is driven and projected, an input operation with the enter key is not detected, or image signal input is performed. If not detected, it is possible to reduce the power consumption of the projector 1 by projection by setting the brightness setting value that gives the lowest brightness among the three or more brightness setting values. Can be improved.

  In the projector 1 according to the embodiment, when the input operation with the enter key is not detected or the image signal input is not detected in the state where the driving power is switched and the light source device 11 is driven and projected. Is set to a luminance setting value that results in low luminance, but the present invention is not limited to this, and a luminance setting value may be set.

  In the projector 1 according to the embodiment, when the luminance is switched, the time T1 as the predetermined time is set to 3 seconds, and is performed at a predetermined number of times (3 times) every predetermined time (every 3 seconds). However, the present invention is not limited to this, and the time and number of times for performing luminance switching may be set as appropriate.

  In the projector 1 according to the embodiment, when the luminance is switched, the luminance switching time is set as a predetermined time. However, instead of the time for switching the luminance, the total time when the luminance is switched and projected a plurality of times may be set as the predetermined time. For example, the predetermined time may be 30 seconds, and the projection may be performed a plurality of times by switching the luminance within this time. In this case, the projection time and the number of projections for each luminance setting value may be different.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 11 ... Light source device, 19 ... Image signal detection means, 20 ... Control means, 21 ... Memory | storage means, 23 ... Input operation means, 25 ... Light source control means, 201 ... Timer, 202 ... Brightness setting means, 211 ... Luminance setting information, G1, G2, G3 ... projected image, T1 ... time.

Claims (5)

A projector that modulates and projects light emitted from a light source device based on image information,
Storage means for storing a plurality of brightness setting values as brightness setting information;
Light source control means for generating a plurality of drive powers for driving the light source device based on the plurality of brightness setting values;
Brightness setting means for controlling the operation of the light source control means,
When the image signal is detected after the power is turned on or when the image signal is detected after switching the image input, the luminance setting unit is configured to perform the light source control unit at a predetermined time based on the luminance setting information of the storage unit. A projector that switches and generates the drive power to project an image. The projector according to claim 1,
An input operation means for instructing the brightness setting means to perform an operation by an input operation;
In the state where the driving power is switched and the light source device is driven and projected, the brightness setting unit detects the input operation by the light source control unit when detecting the input operation by the input operation unit. A projector that generates the driving power based on the brightness setting value at the time, and starts projecting the image. The projector according to claim 1 or 2, wherein
An input operation means for instructing the brightness setting means to perform an operation by an input operation;
When the luminance setting means does not detect the input operation by the input operation means in a state where the light source device is driven by switching the driving power and is projected, the luminance setting is made to the light source control means. A projector that generates the driving power based on a predetermined luminance setting value based on information and starts projecting the image. The projector according to claim 3,
The projector according to claim 1, wherein the predetermined luminance setting value based on the luminance setting information is set to a luminance setting value that is the lowest luminance among the luminance setting values. A method for controlling a projector that modulates and projects light emitted from a light source device based on image information,
Storage means for storing a plurality of brightness setting values as brightness setting information, light source control means for generating a plurality of drive powers for driving the light source device based on the plurality of brightness setting values, and operation of the light source control means Brightness setting means for controlling,
An image signal detection step for detecting an image signal after power-on or an image signal after image input switching;
When the image signal is detected, a measurement step for measuring a predetermined time;
A luminance switching step of switching and generating the driving power in the predetermined time based on the luminance setting information of the storage means;
A projection step of projecting an image with the driving power generated by switching;
A projector control method comprising: