JP2015184299A - Projector and projector control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector that is driven by switching a power between an externally supplied power and a power charged in an internal battery, and thereby can be downsized and light-weighted.SOLUTION: A projector 100 comprises: an AC power source input unit 130; a battery unit 175; a power switch unit 164 that switches any of a first drive to be driven by a power of the AC power source input unit 130 and a second drive to be driven by an electric discharge of the battery unit 175; a light source device 255; a control unit 160; and an operation unit 120. When the operation unit 120 receives a prescribed instruction during execution of the first drive, the control unit 160 is configured to instruct a switching from the first drive to the second drive, and instruct the light source device 255 to emit light at a second luminance value lower than a first luminance value to be emitted by the light source device 255 in the first drive.

Description

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

As one form of display device that displays images such as content, light emitted from a light source that employs a high-intensity lamp is modulated according to an image signal by a light modulation device, and this modulated light is enlarged and projected onto a screen or the like Projectors that display images are known.
As is well known, when it is desired to turn on the projector lamp immediately after it is turned off, it is necessary to wait until the temperature around the lamp decreases. Accordingly, when the projector is moved and projected, it is inefficient to turn off the lamp being projected and move it, and wait for the lamp to cool down at the destination, as shown in Patent Document 1 below. There is disclosed a projector system in which a battery that can be charged and discharged is mounted, and the driving is continued by discharging from the battery even when power is not supplied from an external commercial power source. Patent Document 2 below discloses a projector light source that can be driven by either a battery or an external commercial power source.

JP 2012-98644 A JP 2007-66878 A

However, when the projector is moved while the lamp is lit while supplying power from the battery, the lamp is lit at a high brightness that allows projection of an image even during movement, so a lot of power is consumed. A large-capacity battery was required, and the size of the wagon and projector itself increased.
The present invention has been made in view of the above-described problems, and an object of the present invention is to reduce the size and weight of a projector that is used by switching between externally supplied electric power and electric power charged in an internal battery. And

  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]
The projector according to this application example includes an external power supply unit to which power is supplied from the outside, a charging unit that can charge and discharge the power, a first drive that is driven by the power supplied to the external power supply unit, and the A switching unit that switches between any of the second drives driven by discharging of the charging unit, a light source unit that emits light so that an image can be projected, a control unit that controls the switching unit and the light source unit, and an input unit that receives instructions And when the input unit receives a predetermined instruction while executing the first drive, the control unit switches the first drive to the second drive. The switching unit is instructed to instruct the light source unit to emit light at a second luminance value lower than the first luminance value emitted by the light source unit in the first driving.

  According to such a configuration, when the projector receives a predetermined instruction while driving with power supplied to the external power supply unit, the projector switches to driving by discharging of the charging unit, lowers the luminance, and switches the light source unit. Make it emit light. Therefore, when the projector is driven by the power supplied from the charging unit instead of the power supplied from the external power supply unit, the power consumption is reduced, so the capacity of the charging unit can be reduced. Can be reduced in size and weight.

[Application Example 2]
In the projector according to the application example, it is preferable that the predetermined instruction is a pause instruction for temporarily stopping projection of the image.

  According to such a configuration, when the projector receives a pause instruction to temporarily stop projecting an image, the projector switches to driving by the power supplied from the charging unit, and the luminance of the light source unit is lowered. Can be reduced.

[Application Example 3]
In the projector according to the application example, it is preferable that the predetermined instruction is generated when projection light for projecting the image is blocked.

  According to such a configuration, by blocking the projection light for projecting the image, the projector is switched to driving by the power supplied from the charging unit, and the power consumption can be reduced.

[Application Example 4]
In the projector according to the application example, it is preferable that the control unit pauses the generation of the image for projection when the input unit receives the predetermined instruction.

  According to such a configuration, when the input unit receives a predetermined instruction, the projector can further reduce power consumption by stopping generation of an image for projection.

[Application Example 5]
The projector control method according to this application example is a projector control method including a charging unit that can charge and discharge power and a light source unit that emits light so that an image can be projected. A first driving process for driving; a receiving process for receiving an instruction; a determination process for determining whether or not the instruction received in the receiving process is a predetermined instruction; and the instruction is the predetermined instruction A switching step of switching to a second driving step driven by discharging from the charging unit, and the light source unit that emits light in the first driving step when switched to the second driving step in the switching step. A light emitting step of emitting light at a second luminance value lower than the first luminance value.

  According to such a method, when the projector receives a predetermined instruction while driving with electric power supplied to the external power supply unit, the projector switches to driving by discharging of the charging unit, lowers the luminance, and switches the light source unit. Make it emit light. Therefore, when the projector is driven by the power supplied from the charging unit instead of the power supplied from the external power supply unit, the power consumption is reduced, so the capacity of the charging unit can be reduced. Can be reduced in size and weight.

[Application Example 6]
The projector according to this application example includes an external power supply unit to which power is supplied from the outside, a charging unit that can charge and discharge the power, a first drive that is driven by the power supplied to the external power supply unit, and the A switching unit that switches between the second driving driven by discharging of the charging unit, a light source unit that emits light so that an image can be projected, and a control unit that controls the switching unit and the light source unit. The unit instructs the switching unit to switch from the first drive to the second drive when the external power supply is suspended when the first drive is being performed. In the first driving, the light source unit is instructed to emit light at a second luminance value lower than the first luminance value emitted from the light source unit.

  According to such a configuration, when the power supply from the outside is stopped when the projector is driven by the power supplied to the external power supply unit, the projector is switched to driving by discharging the charging unit, and the brightness is lowered. The light source unit emits light. Therefore, when the projector is driven by the power supplied from the charging unit instead of the power supplied from the external power supply unit, the power consumption is reduced, so the capacity of the charging unit can be reduced. Can be reduced in size and weight.

1 is a block diagram showing a functional configuration of a projector according to an embodiment of the invention. The figure explaining the difference in the operation mode in battery drive and AC drive. The figure which shows typically the optical system of a projection unit. The flowchart which shows the flow of a power supply switching process.

  Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment)
Hereinafter, as an image projection apparatus according to an embodiment of the present invention, light emitted from a light source is modulated in accordance with an input image signal, and the modulated light is enlarged and projected onto a projection surface such as a screen to display an image. The projector 100 will be described.
FIG. 1 is a block diagram illustrating a functional configuration of the projector 100 according to the present embodiment. The projector 100 includes a signal input unit 110, an operation unit 120, an AC power input unit 130, an image processing unit 140, an OSD processing unit 150, a control unit 160, a power supply unit 170, a shutter position detection unit 180, a shutter unit 185, and an audio output. Unit 190 and image projection unit 200. Each functional unit is stored in hardware such as a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), a flash memory, and the like, and a ROM and a flash memory not shown. Each function is realized through collaboration with existing software.
The signal input unit 110 receives input signals of contents in various formats. Note that the content is assumed to be a moving image including sound, such as a mode output from a computer or DVD playback device connected by a predetermined connection method, a mode of reading data stored in flash memory, the Internet, etc. Assume a mode of inputting via a network.

The signal input unit 110 extracts image data and audio data from the received input signal, outputs the extracted image data to the image processing unit 140, and outputs the extracted audio data to the control unit 160.
The operation unit 120 corresponds to an input unit, and includes operation keys provided on a housing (not shown) of the projector 100, and receives various instructions to the projector 100.
The image processing unit 140 performs image processing such as gradation correction, color correction, and magnification correction on the image data based on an instruction from the control unit 160, and generates a projection image that can be projected by the projection unit 250. The generated projection image is sent to the OSD processing unit 150. A detailed description of the image processing executed by the image processing unit 140 is disclosed in, for example, Japanese Patent Application Laid-Open No. 2010-181807.
The OSD processing unit 150 generates an OSD image including various menu screens, message screens, and the like based on an instruction output from the control unit 160 based on a user's instruction, and the OSD image is added to the projection image generated by the image processing unit 140. Is synthesized. As a result, the projected image has an aspect in which the OSD image is superimposed on the content image. The projection image synthesized by the OSD processing unit 150 is output to the image projection unit 200.

Commercial power supplied from the outside is input to the AC power input unit 130. The AC power supply input unit 130 corresponds to an external power supply unit. The power supply unit 170 includes a power supply circuit (not shown), converts AC commercial power input to the AC power input unit 130 into DC power having a predetermined voltage, and supplies power to each functional unit. The AC power input unit 130 notifies the control unit 160 of a detection state as to whether or not commercial power is input from the outside.
The power supply unit 170 includes a battery unit 175. The battery unit 175 has a rechargeable battery (secondary battery) that can be repeatedly charged and discharged, and performs charging when commercial power is input to the AC power input unit 130. When the supply is stopped, discharging is performed based on an instruction from the control unit 160 to supply power to each functional unit. In the present embodiment, the battery unit 175 corresponds to a charging unit, and a rechargeable battery installed in the projector 100 is assumed. The rechargeable battery of the battery unit 175 may have a capacity capable of driving the battery for a temporary time (for example, about 10 minutes) while the projector 100 is moved. For this reason, the rechargeable battery is assumed to be small and light.
The shutter unit 185 is installed in the vicinity of the projection lens 292 of the image projection unit 200, and has a plate-like member that can slide in one direction when pressed by a user's finger. When this plate-like member is in one position, the modulated light (projection light) emitted from the projection lens 292 is in a shielding state where it is shielded by the plate-like member. When the plate member is in the other position, the plate member is not shielded by the plate member, and the modulated light emitted from the projection lens 292 is projected onto the screen SC.

The shutter position detection unit 180 detects the sliding position of the plate-like member of the shutter unit 185 with a sensor or the like, and based on the detected sliding position, is the modulated light emitted from the image projection unit 200 blocked? Information on whether or not is output to the control unit 160.
The audio output unit 190 includes a speaker, and outputs audio based on the input audio signal from the speaker. In the present embodiment, the control unit 160 generates a sound signal by performing predetermined processing on the sound data extracted from the input signal, and outputs the generated sound signal to the sound output unit 190.
The control unit 160 includes a power supply switching determination unit 162, a power supply switching unit 164, and an operation mode switching unit 166, and controls the operation of each functional unit.
The power supply switching determination unit 162 uses a power source for driving the projector 100 as commercial power based on a change in a predetermined internal state among setting states of each functional unit (hereinafter referred to as an internal state). Or the second driving (battery driving) using the DC power stored in the battery unit 175.
In this embodiment, the power supply switching determination unit 162 monitors the AV mute state, the open / close state of the shutter unit 185, and the input state of commercial power to the AC power input unit 130 as predetermined internal states, and changes in these states. Accordingly, the power source is determined and switching of the power supply circuit is determined. The AV mute operation by the user and the opening / closing operation of the shutter unit 185 by the user correspond to predetermined instructions.

(A) AV Mute State When the user operates the operation unit 120 to instruct to pause image projection and output audio (pause instruction) and transition to the AV mute state, the power supply switching determination unit 162 starts from the battery unit 175. Determine the power acquisition. In addition, when the user operates the operation unit 120 to instruct to cancel AV mute, the power supply switching determination unit 162 determines power acquisition from commercial power.
(B) Opening / Closing State of Shutter Unit 185 When the user changes the shutter unit 185 from the non-shielding state to the shielding state, the power supply switching determination unit 162 determines the acquisition of power from the battery unit 175. In addition, when the user changes the shutter unit 185 from the shielded state to the non-shielded state, the power supply switching determination unit 162 determines to acquire power from commercial power.
(C) Input state of commercial power to AC power input unit 130 When the user performs an operation such as removing a power plug (not shown) and the input of the commercial power is cut off, the power switch determination unit 162 is connected to the battery unit 175. Determine power acquisition from. When the input of commercial power is resumed, the power supply switching determination unit 162 determines to acquire power from commercial power.
The power supply switching determination unit 162 may determine based on at least one determination result among these internal states (a), (b), and (c). For example, when the AV mute is operated by the user, the power supply switching determination unit 162 may determine acquisition of power from the battery unit 175, and when the input of commercial power is interrupted, the power supply switching determination unit 162 The power acquisition from the battery unit 175 may be determined.

Further, the power supply switching determination unit 162 may determine based on a logical sum or logical product of determination results in a plurality of internal states. For example, when the AV mute is operated by the user and the input of commercial power is interrupted, the power supply switching determination unit 162 may determine to acquire power from the battery unit 175.
The power source switching unit 164 corresponds to a switching unit, and switches the power source based on the determination of the power source switching determination unit 162, thereby switching the power source to either commercial power or the battery unit 175. In addition, when switching the power source from commercial power to the battery unit 175, the power supply switching unit 164 calculates the usable time T1 from the amount of power stored in the battery unit 175, and the usage time of the battery unit 175 exceeds the usable time T1. In this case, a function of switching the power source to commercial power is provided. In addition, when the usable time T1 of the battery unit 175 does not exceed a predetermined minimum time, it is possible to assume a mode in which the power source is not switched from the commercial power to the battery unit 175.
The operation mode switching unit 166 switches the operation mode according to the power source. In this embodiment, when the power source is commercial power, the operation mode for AC driving is selected, and when the power source is the battery unit 175, the operation mode for battery driving is selected.

In the operation mode for battery driving, as shown in FIG. 2, the luminance value (second luminance value) emitted by the light source device 255 corresponding to the light source unit in the projection unit 250 is issued in the operation mode for AC driving. Lower than the brightness value (first brightness value). Further, the light modulation device 280 in the projection unit 250 may stop the modulation processing in the operation mode for battery driving. Furthermore, in an operation mode for battery driving, it is possible to assume a mode in which at least a part of the functions of the image processing by the image processing unit 140 and the composition processing by the OSD processing unit 150 are stopped.
The image projection unit 200 includes a lamp driving unit 210, a light bulb driving unit 220, and a projection unit 250.
The lamp driving unit 210 controls driving of the light source device 255 of the projection unit 250 based on a driving instruction output from the control unit 160. In the present embodiment, the lamp driving unit 210 includes a capacitor (not shown). Therefore, when the power source is switched, the stored capacitor is discharged, so that the arc tube 256 (FIG. 3) of the light source device 255 can be switched instantaneously without transitioning to the extinguished state. The lamp driving unit 210 switches the luminance value of the light source device 255 to the first luminance value or the second luminance value based on an instruction from the control unit 160.

The light valve drive unit 220 generates a drive signal for driving the light modulation device 280 based on the projection image output from the OSD processing unit 150 and outputs the drive signal to the projection unit 250.
The projection unit 250 generates modulated light based on the drive signal output from the light valve drive unit 220, and projects the generated modulated light onto the screen SC.
Here, FIG. 3 is a diagram schematically showing the optical system of the projection unit 250, and the schematic configuration of the optical system will be described with reference to FIG.
The function of the optical system of the projection unit 250 is configured as an optical system unit 251. The optical system unit 251 includes an optical component casing 252, a light source device 255, an illumination optical device 260, a color separation optical device 265, a relay optical device 270, a light modulation device 280, and a projection optical device 290. The optical components constituting each of these devices are accommodated in an optical component casing 252.

The light source device 255 includes an arc tube 256 that emits a light beam and a reflector 257. The light source device 255 reflects the light beam emitted from the arc tube 256 by the reflector 257, aligns the emission direction, and emits the light toward the illumination optical device 260. The illumination optical axis OC is a central axis of a light beam emitted from the light source device 255 to the illuminated area side. Further, it is assumed that the arc tube 256 is a light source capable of emitting light with high brightness, such as a halogen lamp, a xenon lamp, and an ultra-high pressure mercury lamp.
The illumination optical device 260 includes lens arrays 261 and 262, a polarization conversion element 263, a superimposing lens 264, and a field lens 269. The illumination optical device 260 generates illuminance in a plane orthogonal to the illumination optical axis OC with respect to the light beam emitted from the light source device 255. It has a function to make uniform.
The color separation optical device 265 includes dichroic mirrors 266 and 267 and a reflection mirror 268. The light beam emitted from the illumination optical device 260 is converted into three colors of red (R) light, green (G) light, and blue (B) light. The light is separated into colored light and guided to the three liquid crystal devices 285R, 285G, and 285B.

The relay optical device 270 includes an incident side lens 272, a relay lens 276, and reflection mirrors 274 and 278. In this relay optical device 270, the length of the optical path of the color light (B light in the first embodiment) separated by the color separation optical device 265 is longer than the length of the optical path of the other color lights. This prevents a decrease in light use efficiency due to light divergence or the like, and guides the color light to the liquid crystal device 285 (the liquid crystal device 285B in the first embodiment).
The light modulation device 280 includes liquid crystal devices 285R, 285G, and 285B of three incident side polarizing plates 284, three emission side polarizing plates 286, and a cross dichroic prism 288. The liquid crystal devices 285R, 285G, and 285B modulate each color light separated by the color separation optical device 265 according to a drive signal. The cross dichroic prism 288 combines the color lights modulated by the liquid crystal devices 285R, 85G, and 85B, and emits the light to the projection optical device 290 side.
The projection optical device 290 includes a projection lens 292. The projection optical device 290 enlarges the light beam modulated and synthesized by the light modulation device 280 by the projection lens 292 and projects it onto the screen SC. As a result, a projected image based on the input image signal is displayed on the screen SC.
In the present embodiment, the projector 100 is assumed to be a stationary type that projects toward a remote screen SC, but is not limited thereto, and may be a short focus or ultra short focus projector. A projector capable of interactive operation may be used.

FIG. 4 is a flowchart showing the flow of the power source switching process executed by the control unit 160. This process is set to be executed at predetermined time intervals when the projector 100 is driven.
When this process is started, the control unit 160 acquires its own internal state (step S300), and determines whether or not a predetermined internal state has changed (step S302).
Here, when it is determined that the predetermined internal state has not changed (No in step S302), this process ends.
On the other hand, when it is determined that the predetermined internal state has changed (Yes in step S302), the control unit 160 determines whether or not it is being driven by the AC power supply (step S304).
If it is determined that the AC power source is not being driven (No in step S304), the control unit 160 switches the power source to the AC power source (step S330), and then switches to the operation mode for AC driving (step S332). ), The process is terminated.
On the other hand, when it determines with driving | running | working with AC power supply (it is Yes at step S304), the control part 160 calculates the usable time T1 of the battery part 175 (step S306).

Next, the control unit 160 switches the power source to the battery unit 175 (step S308), then switches to an operation mode corresponding to battery driving (step S310), and starts timekeeping (step S312).
Next, the control unit 160 determines whether or not the main power supply of the projector 100 is turned off (step S314). Note that the main power is turned off means that a power-off operation is input by the power key of the operation unit 120.
If it is determined that the main power supply of the projector 100 has been turned off (Yes in step S314), the control unit 160 proceeds to step S322.
On the other hand, when it is determined that the main power of the projector 100 is not turned off (No in step S314), the control unit 160 acquires its own internal state (step S316), and whether or not the predetermined internal state has changed. Is determined (step S318).
If it is determined that the predetermined internal state has changed (Yes in step S318), the process returns to step S304.

On the other hand, when it is determined that the predetermined internal state has not changed (No in step S318), the control unit 160 determines whether or not the elapsed time from the start of the time exceeds the usable time T1 ( Step S320).
Here, when it is determined that the elapsed time since the start of time measurement does not exceed the usable time T1 (No in step S320), the process returns to step S314.
On the other hand, if it is determined that the elapsed time from the start of time measurement has exceeded the usable time T1 (Yes in step S320), the process proceeds to step S322.
In step S322, the control unit 160 executes an end process for ending a series of processes, and ends the process.

According to the embodiment described above, the following effects can be obtained.
(1) The projector 100 determines either commercial power or the battery unit 175 as a power source based on a change in the internal state according to a predetermined instruction from the user, and based on the determined power from the power source Since it is driven, an efficient power source can be selected according to a change in the internal state of the projector 100.
(2) When the supply of commercial power to the projector 100 is stopped, the battery unit 175 immediately starts supplying power to the light source device 255, so that the light emitting tube 256 of the light source device 255 is switched to the off state. In addition, since the light emission state can be maintained, it is possible to avoid waiting until relighting when the arc tube 256 is turned off.
(3) When the projector 100 switches the power source from the commercial power to the battery unit 175, the luminance of the light source device 255 is lower than that at the time of driving with the commercial power, and further, the function such as the modulation process is stopped. The amount of heat generated by the main body also decreases, and the projector 100 can be easily gripped and transferred.
An apparatus that implements the above-described method may be realized by a single apparatus or may be realized by combining a plurality of apparatuses, and includes various aspects.
Each configuration in each embodiment and a combination thereof are examples, and addition, omission, replacement, and other changes of the configuration can be made without departing from the spirit of the present invention. Further, the present invention is not limited by the embodiments, but is limited only by the scope of the claims.

  DESCRIPTION OF SYMBOLS 100 ... Projector, 110 ... Signal input part, 120 ... Operation part, 130 ... AC power supply input part, 140 ... Image processing part, 150 ... OSD processing part, 160 ... Control part, 162 ... Power supply switching determination part, 164 ... Power supply switching 166... Operation mode switching unit 170 170 Power source 175 Battery unit 180 Shutter position detection unit 185 Shutter unit 190 Sound output unit 200 Image projection unit 210 Lamp drive unit 220 DESCRIPTION OF SYMBOLS ... Light valve drive part, 250 ... Projection unit, 251 ... Optical system unit, 252 ... Housing for optical components, 255 ... Light source device, 256 ... Light emission tube, 257 ... Reflector, 260 ... Illumination optical device, 261, 262 ... Lens Array, 263, polarization conversion element, 264, superimposing lens, 265, color separation optical device, 266, 267, da Croix mirror, 268 ... reflective mirror, 269 ... field lens, 270 ... relay optical device, 272 ... incident side lens, 274, 278 ... reflective mirror, 276 ... relay lens, 280 ... light modulator, 284 ... incident side polarizing plate DESCRIPTION OF SYMBOLS 285 ... Liquid crystal device, 285R ... Liquid crystal device, 285G ... Liquid crystal device, 285B ... Liquid crystal device, 286 ... Ejection side polarizing plate, 288 ... Cross dichroic prism, 290 ... Projection optical device, 292 ... Projection lens.

Claims (6)

An external power supply to which power is supplied from the outside;
A switching unit that switches between a charging unit that can charge and discharge the power, a first drive that is driven by the power supplied to the external power supply unit, and a second drive that is driven by the discharge of the charging unit;
A light source that emits light so that an image can be projected;
A control unit for controlling the switching unit and the light source unit;
An input unit for receiving instructions,
The control unit instructs the switching unit to switch from the first drive to the second drive when the input unit receives a predetermined instruction while executing the first drive. The projector instructing the light source unit to emit light at a second luminance value lower than the first luminance value emitted by the light source unit in the first driving. The projector according to claim 1.
The projector according to claim 1, wherein the predetermined instruction is a pause instruction for temporarily stopping projection of the image. The projector according to claim 1.
The projector is characterized in that the predetermined instruction is generated when projection light for projecting the image is blocked. The projector according to any one of claims 1 to 3,
The control unit, when the input unit receives the predetermined instruction, pauses the generation of the image for projection. A projector control method comprising: a charging unit capable of charging and discharging power; and a light source unit that emits light so that an image can be projected.
A first driving step of driving by the electric power supplied from the outside;
A reception process for receiving instructions;
A determination step of determining whether or not the instruction received in the reception step is a predetermined instruction;
When the instruction is the predetermined instruction, a switching step of switching to a second driving step driven by discharging from the charging unit;
A light emitting step of emitting light at a second luminance value lower than a first luminance value of the light source unit that emits light in the first driving step when switching to the second driving step in the switching step. And a projector control method. An external power supply to which power is supplied from the outside;
A switching unit that switches between a charging unit that can charge and discharge the power, a first drive that is driven by the power supplied to the external power supply unit, and a second drive that is driven by the discharge of the charging unit;
A light source that emits light so that an image can be projected;
A control unit that controls the switching unit and the light source unit,
The control unit instructs the switching unit to switch from the first drive to the second drive when the external power supply is suspended while the first drive is being performed. The projector instructing the light source unit to emit light at a second luminance value lower than the first luminance value emitted by the light source unit in the first driving.

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