JP6385061B2 - Projection type display device and control method thereof - Google Patents

Description

  The present invention relates to a projection display device such as a liquid crystal projector and a control method thereof.

  Patent Document 1 proposes a projection display device that stops power supply to a light source when an input of a video signal for a predetermined time or more is in a no-input state in order to save power.

JP-A-2-31886

  However, in Patent Document 1, the time from when the video signal is not input to when the light source is turned off varies depending on the purpose of use. However, Patent Document 1 does not consider this, and the light source is turned off unintentionally. There is a risk of it.

  It is an exemplary object of the present invention to provide a projection display apparatus capable of performing power saving control according to usage and a control method thereof.

The projection display device of the present invention is a projection display device that modulates and projects light from a light source according to a video signal, a setting unit that sets a variable time, a detection unit that detects illuminance, After the video signal input is started, if the state in which the video signal is not input continues for a time set by the setting means or longer, the light source is turned off or the power is saved more than when the video signal is input. possess a control means for driving the power, and the setting means, characterized in that the detecting means is reset so as to shorten the time when detecting the following illuminance predetermined illuminance.

  ADVANTAGE OF THE INVENTION According to this invention, the projection type display apparatus which can perform power saving control according to a use application, and its control method can be provided.

It is a block diagram which shows the system configuration | structure of the projection type display apparatus of this invention. Example 1 It is a flowchart which shows the initial setting of the power management control of the projection type display apparatus shown in FIG. Example 1 It is a flowchart of the power management control of the projection type display apparatus shown in FIG. Example 1 It is a block diagram which shows the system configuration | structure of the projection type display apparatus of this invention. (Example 2) It is a flowchart of the power management control of the projection type display apparatus shown in FIG. Example 1

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In each embodiment, when the input of the video signal is started, the control for turning off the light source or driving to save power is performed when “no input state (no input of the video signal)” for a predetermined time or longer. "

  FIG. 1 is a block diagram illustrating a system configuration of a projection display apparatus 100A according to the first embodiment. The projection display device 100A is configured as a liquid crystal projector in this embodiment, and includes a video signal input unit 1, a synchronization signal detection unit 2, a video signal processing unit 3, a liquid crystal drive unit 4, a ballast 5, a light source 6, a projection lens 8, It has a power supply unit 9, a control unit 10, an operation panel 12, and storage units 11 and 13.

  A video signal from an external device such as a personal computer (PC) is input to the video signal input unit 1 and the synchronization signal detection unit 2. The video signal input unit 1 includes an AD conversion that converts an analog signal such as a VGA or Video signal into a digital signal, and a receiver that converts a digital signal such as HDMI (registered trademark) or DVI into a predetermined digital signal format. The synchronization signal detector 2 separates and extracts a synchronization signal such as horizontal synchronization and vertical synchronization from the video signal. The video signal input unit 1 and the synchronization signal detection unit 2 may be configured by the same IC. The digital video signal converted by the video signal input unit 1 and the synchronization signal separated by the synchronization signal detection unit 2 are sent to the video signal processing unit 3.

  The video signal processing unit 3 is configured by a DSP dedicated to video signal processing and the like. The video signal processing unit 3 reads the resolution of the input video signal and converts it to a resolution required for internal processing, menu display at the time of button operation, Performs keystone correction (keystone correction) processing.

  Also, the video signal processing unit 3 determines whether the video signal is input to the projection display device 100A from the synchronization signal input from the synchronization signal detection unit 2, and if there is no input of the video signal, that fact. Generate an image that informs the user.

  The video signal processing unit 3 is provided with a counter 3a as time measuring means for measuring the time when the video signal is not input. In addition, the structure of a time measurement means is not limited.

  A storage unit 13 is connected to the video signal processing unit 3. The storage unit 13 is configured by a nonvolatile memory such as an EEPROM or a FLASH memory, and stores color setting data in each image mode. The video signal processing unit 3 also performs color adjustment of the projected video based on the color setting data.

  In this embodiment, the video signal processing unit 3 functions as a setting unit that sets a variable time (off time described later).

  The digital signal processed into a predetermined format by the video signal processing unit 3 is sent to the liquid crystal driving unit 4 and converted into a liquid crystal driving signal for driving the liquid crystal panel in the optical unit 7. The liquid crystal panel is a light modulation element that modulates light from the light source 6 based on the liquid crystal drive signal.

  The ballast 5 is a power source for the light source 6, and the amount of light emitted from the light source 6 is kept constant by performing constant power control.

  The optical unit 7 includes an illumination optical system, a liquid crystal panel, a color separation unit, a color synthesis unit, and the like. The illuminance distribution of the light from the light source 6 is made uniform by the illumination optical system, and is separated into RGB three colors by the color separation unit. The separated light is applied to the RGB liquid crystal panels, and the transmittance (reflectance) is changed according to the video signal. An image is generated by combining transmitted light (reflected light) of RGB in a color combining unit.

  The projection lens 8 enlarges and projects the image generated by the optical unit 7 onto the screen 200.

  The power supply unit 9 converts an AC power input from the outside into a DC power source, supplies power to each unit in the ballast 5 or the projection display device 100A, and also improves a power factor by a PFC circuit.

  The control unit 10 includes a CPU such as a microcomputer, and is a control unit that performs overall control of the projection display device 100A. For example, on / off control of the light source 6 according to a control signal to the ballast 5, dimming processing for adjusting the light emission level at the light source 6, power supply control to each circuit, or FAN driving for cooling is performed. In addition, when the light source 6 is not turned on or when the temperature inside the projection display apparatus 100A is abnormal, the light source 6 is turned off, and the LED is turned on to notify the user of the abnormality. Do.

  A storage unit 11 is also connected to the control unit 10. The storage unit 11 is configured by a nonvolatile memory such as an EEPROM or a FLASH memory, and is used for setting data of the projection display device 100A, status recording at the time of occurrence of an abnormality (error code recording), and the like.

  The operation panel 12 includes a button for performing operations such as power ON / OFF, and an LED for informing the user of the state of the projection display device 100A.

  Further, the user can set the image mode (operation mode) of the projection display device 100 </ b> A through the operation panel 12. That is, the operation panel 12 functions as an operation unit for performing an input operation of the image mode. The image mode includes a standard mode, a presentation (presentation) mode, a theater mode, and other modes.

  When the control unit 10 detects that a button on the operation panel 12 has been pressed, the control unit 10 determines which button has been pressed and controls each unit necessary for the operation. A light receiving sensor may be provided, and the projection display device 100A may be operated by a remote controller.

  Next, the operation of the projection display device 100A according to the first embodiment will be described.

  FIG. 2 is a flowchart of initial setting of power management control according to the first embodiment, where “S” represents a step. The flowchart shown in FIG. 2 can be embodied as a program for causing a computer to execute each procedure, and is stored in the storage unit 11 or the like. This applies to other flowcharts as well.

  In accordance with the setting on the operation panel 12, the control unit 10 sets a power management control on flag in the video signal processing unit 3 (S101) and causes the video signal processing unit 3 to set an off time according to the image mode. Specifically, the control unit 10 notifies the video signal processing unit 3 of the image mode, and the video signal processing unit 3 acquires and sets the off time corresponding to the image mode from the storage unit 13.

  Here, the “off time” is the time from when the video signal is in a no-input state to when the light source 6 is turned off. When the video signal is not input for more than the off time, the light source 6 is turned off. Is done.

  Table 1 shows a setting example of the off time of each image mode stored in the storage unit 13. According to Table 1, when the image mode is standard, the off time is 15 minutes (S102, S103), when the presentation mode is 10 minutes (S104, S105), and when the cinema mode is 3 minutes (S106, S107). Each is set. In other image modes, it is set to 5 minutes (S108).

  For example, when a video signal is input from a PC at a meeting or the like, if the PC is set to a power saving setting, the video output is stopped and the light source is turned off if there is no PC operation for a certain period of time in the discussion. With a light source such as a mercury lamp, it takes time for the brightness to stabilize after re-lighting, which may hinder the progress of the conference. As described above, it is necessary to set the off-time longer for use such as a conference. Therefore, in this embodiment, in the presentation mode (conference mode) set in the conference, the off time is set to a longer 10 minutes.

  On the other hand, when a video signal is input from the player during movie watching, the player menu screen is displayed even when playback is stopped, and the video signal is not interrupted. The video signal is interrupted only when the player is turned off. . In other words, it is necessary to set the off time short for use such as watching a movie. Therefore, in this embodiment, in the cinema mode (movie appreciation mode) set for movie appreciation, the off time is set to a short 3 minutes.

  The type of the image mode and the set value of the off time are not limited to the above, and various changes can be made within the scope of the gist. When the setting of the off time is completed, the initial setting of power management control is completed.

  FIG. 3 is a flowchart showing power management control. In FIG. 3, the video signal processing unit 3 performs the main steps of power management control, but the control unit 10 may perform this based on information from the video signal processing unit 3. For example, the counter 3 a may also be provided in the control unit 10. This is also true for Example 2.

  First, when the video signal is not input, the synchronization signal detection unit 2 does not detect the synchronization signal, and the synchronization signal is not transmitted to the video signal processing unit 3. The video signal processing unit 3 determines that the video signal is not input when there is no input of the synchronization signal, and generates and outputs an image indicating to the user that the video signal is not input (S111).

  Next, the video signal processing unit 3 confirms whether the setting of power management control is on (S112). When the power management control is off, the process ends with the image informing that no video signal is input being projected on the screen 200.

  If the power management control setting is on, the counter 3a is reset to zero and time counting is started (S113). When the power management control is finished or until the count reaches the off time, the time count by the counter 3a is continued. In the present embodiment, the power management control is terminated when the input of the video signal is resumed or when the operation is performed from the operation panel 12 (S114), but is not limited thereto.

  When the input of the video signal is resumed or when an operation is performed from the operation panel 12, the time counting operation by the counter 3a is terminated and the power management control is terminated (S117).

  When the video signal input resumes and no operation continues, and the time count reaches the off time, the video signal processing unit 3 transmits the information to the control unit 10, and the control unit 10 is the ballast 5 that is the power source of the light source 6. The light source 6 is turned off via (S116). Thereafter, the power management control is terminated.

  With the above control, power management control according to the image mode can be performed, and power saving control can be effectively performed according to the usage.

  In this embodiment, the setting of the off time is changed according to each image mode. However, the off time may be changed according to the type of video signal to be input (for example, a moving image and a still image). The type of video signal can be identified by the detection result of the synchronization signal detection unit 2. For example, the video signal processing unit 3 may set the off time when the video signal is a moving image longer than the off time when the video signal is a still image.

  In S116, the light source 6 is turned off, but power saving driving may be performed to lower the light emission level from the normal lighting level.

  Further, in this embodiment, the video signal processing unit 3 automatically selects and sets a preset off time, but the user can set an arbitrary off time according to his / her preference via the operation panel 12. It may be set.

  The second embodiment is different from the first embodiment in that power management control is performed according to the surrounding environment of the projection display device 100B.

  FIG. 4 is a block diagram of a system configuration of the projection display apparatus 100B of the second embodiment, and the same members as those in FIG. 1 are denoted by the same reference numerals. The projection display device 100B has a human sensor 20 (first detection means) added to the projection display device 100A. The human sensor 20 is connected to the video signal processing unit 3, detects the presence or absence of a person around the projection display device 100 </ b> B, and transmits the detection result to the video signal processing unit 3. The configuration of the human sensor 20 is not limited, such as detecting a person using infrared rays, detecting a person by detecting external sound, or detecting a person by face recognition using a camera.

  FIG. 5 is a flowchart showing power management control. In the flowchart shown in FIG. 5, S201 to S204 are added to the flowchart shown in FIG. When the video signal enters the no-input state, an image indicating that the video signal is not input is generated and output. When the power management setting is on, the counter is reset and time counting is started ( S111 to S113).

  Next, the video signal processing unit 3 confirms whether there is a person in the vicinity from the human sensor 20 (S201). If it is determined that there is a person in the vicinity, while the time is counted, confirmation of whether the input signal has been resumed or operated (S114) and whether the time count has reached the off time (S115) are continued.

  If it is determined that there are no people in the vicinity, the off-time is reset (S202). When there are no people in the vicinity, the off-time should be shortened to save labor. Therefore, when there is no person around the projection display device 100B, it is preferable to reset the off time to a time as short as about 1 to 2 minutes.

  You may use the illumination intensity sensor (2nd detection means) which detects illumination intensity instead of a person detection sensor. In this case, the video signal processing unit 3 may be reset so that the off-time is shortened when the illuminance sensor detects illuminance equal to or lower than a predetermined illuminance.

  After resetting the off time, the time count is continued until the input signal is restarted or operated (S203), or the time count reaches the reset off time (S204). When the input signal is resumed or an operation is performed, the time count is finished and the power management control is finished (S117). Further, when the time count reaches the reset off time, the light source 6 is turned off or the power is driven (S116).

  With the above control, power management control can be performed according to the surrounding environment, and power saving control can be effectively performed.

  As mentioned above, although the Example of this invention was described, this invention is not limited to these Examples, A various deformation | transformation and change are possible within the range which does not deviate from the summary.

  The present invention is applicable to the use of a liquid crystal projector.

DESCRIPTION OF SYMBOLS 100A, 100B ... Projection type display apparatus, 3 ... Video signal processing part (setting means), 6 ... Light source, 10 ... Control part (control means)

Claims (9)

A projection display device that modulates and projects light from a light source according to a video signal,
A setting means for setting a variable time;
Detection means for detecting illuminance;
After the video signal input is started, if the state in which the video signal is not input continues for a time set by the setting means or longer, the light source is turned off or the power is saved more than when the video signal is input. Control means driven by electric power, and
The setting means resets the time so as to shorten the time when the detecting means detects illuminance less than or equal to a predetermined illuminance. A projection display device that modulates and projects light from a light source according to a video signal,
A setting means for setting a variable time;
Operation means for accepting user operations;
After the video signal input is started, if the state in which the video signal is not input continues for a time set by the setting means or longer, the light source is turned off or the power is saved more than when the video signal is input. Control means driven by electric power, and
The projection type display device, wherein the setting means sets the time based on a mode in which an image according to the video signal that can be set by the user by the operation means is projected.   3. The projection display device according to claim 2, wherein the setting unit sets the time when the mode is a conference mode longer than the time when the mode is a movie viewing mode. The projection type display device according to claim 2, wherein the mode is an image mode in which a color setting for projecting the video can be set.   5. The projection type display device according to claim 1, wherein the setting unit is a video signal processing unit that processes the video signal. 6. It further has a person detecting means for detecting the presence or absence of a person,
6. The projection type according to claim 2, wherein the setting unit resets the time so that the time is shortened when the person detection unit stops detecting the person. 7. Display device.   The projection type display apparatus according to claim 1, wherein the setting unit arbitrarily sets the time. A method of controlling a projection display device that modulates and projects light from a light source according to a video signal,
Setting a variable time; and
Detecting illuminance;
After the input of the video signal has started, if the state in which there is no input of the video signal continues for more than the time set by the setting step, the light source is turned off or the video signal is input Driving with power saving, and
The method of controlling the projection type display device, wherein the setting step includes resetting the time so as to shorten the time when the detecting step detects an illuminance of a predetermined illuminance or less. A method of controlling a projection display device that modulates and projects light from a light source according to a video signal,
A setting step to set a variable time; and
Accepting user actions,
After the input of the video signal has started, if the state in which there is no input of the video signal continues for more than the time set by the setting step, the light source is turned off or the video signal is input Driving with power saving, and
The step of setting sets the time based on a mode when projecting an image corresponding to the video signal that can be set by the user by the step of receiving the user operation. Control method.