JP2019129471A - Video display device and display control method - Google Patents

Abstract

In a display device for receiving and displaying a plurality of video signals, when each received video signal can be determined as a video signal from one video signal source, the display is switched to simultaneous display of the plurality of video signals with few operations. To provide a video display device capable of performing the above. In a display device for displaying a received video signal, a plurality of video receiving means for receiving a plurality of video signals, and whether a video received by the plurality of video receiving means is a video signal from the same signal source. A determination means for determining, and a first display method for displaying one video signal received by the plurality of video receiving means according to a determination result of the determination means and simultaneously displaying two or more received videos The priority for switching the second display method is changed. [Selection] Figure 1

Description

  The present invention relates to a video display device, and more particularly to a video display device including a plurality of video receiving means.

Many image display devices such as LCD displays and liquid crystal projectors that display image signals include a plurality of image reception IFs. The video reception IF includes VGA, component, composite, DVI, and more recently HDMI (registered trademark), DisplayPort (registered trademark, hereinafter DP), SDI and the like. The video display apparatus can be connected to a plurality of video transmitters by mounting a plurality of video reception IFs. In this case, the user of the video display device operates the remote controller on the video display device side without plugging / unplugging the cable to switch the video signals from a plurality of video transmitters to be displayed on the video display device. Can be highly convenient.
The video signal transmitted from the video transmitter is subjected to reception processing by various video signal receiving receivers (in the video display device) corresponding to the signal protocol.

  For example, in the case of a digital signal such as HDMI, as shown in FIG. 2A, the video transmitter and the video display device are transmitted using a protocol dedicated to HDMI (TMDS signal), and digitally transmitted by the HDMI receiving circuit in the video display device. It is converted into a video signal and transmitted to the image processing engine.

  In the case of an analog signal such as VGA, the analog video signal transmitted from the video transmitter is converted into a digital signal by an analog video signal receiving circuit in the video display device as shown in FIG. Transmitted to the engine.

  Generally, a video display device includes a circuit for measuring signal information (vertical frequency information, resolution, PixelClock, etc.) of a converted video signal, and the image processing engine is based on the signal information. Operate inside.

  In a display device, a single display that displays one of a plurality of received videos is common, but a plurality of video signals are simultaneously displayed as shown in FIGS. 3 (a) and 3 (b). Some have a multi-display function to display.

  Patent Document 1 discloses a method for determining the state of an input signal from received video signal information and a display method and presenting the state of the input video signal to a user using an OSD or the like. There is.

JP, 2014-134755, A

  When the user switches and displays a plurality of video signals received by the display device, the user often presses the input switching button of the remote control continuously to switch. In this case, the video to be displayed in response to the button press is switched in the order of input video 1 → input video 2 → input video 3 → input video 4 → input video 1 & 2 → input video 3 & 4 → input video 1 & 2 & 3 & 4, and input again after input video 1 & 2 & 3 & 4. Switch to video 1. This is shown in FIG. 3 (c). When the user wants to display the input videos 1 & 2, the button must be pressed five times, and the operability is not good.

  Therefore, an object of the present invention is to display a plurality of video signals in a display device that receives and displays a plurality of video signals with a small number of operations when each received video signal can be determined to be a video signal from one video signal source. An object of the present invention is to provide a video display device capable of switching to simultaneous display of video signals.

In order to achieve the above object, a video display apparatus according to the present invention is:
In the display device that displays the received video signal,
A plurality of video receiving means for receiving a plurality of video signals;
A determination unit that determines whether the video received by the plurality of video reception means is a video signal from the same signal source,
With
Priority is given to switching between a first display method for displaying one video signal received by the plurality of video reception means and a second display method for simultaneously displaying two or more received videos according to the determination result of the determination means It is characterized by changing the degree.

  According to the video display device of the present invention, in a display device that receives and displays a plurality of video signals, there are few cases where it is possible to determine that each received video signal is a video signal from one video signal source. It is possible to switch to simultaneous display of multiple video signals by operation.

General connection diagram Background art illustration Background art illustration Display layout diagram Display layout Display layout diagram Block Diagram Block Diagram Block Diagram LCD projector operation flow LCD projector operation flow LCD projector operation flow Layout example Layout example Layout example Layout example diagram Layout example diagram Layout example diagram Layout example Input selection OSD Input selection OSD Input selection OSD Input selection OSD Input selection OSD Input selection OSD Input selection OSD Input selection OSD Input selection OSD Input selection OSD Input selection OSD Input selection OSD Diagram showing the phase difference of multiple signals Diagram showing the phase difference of multiple signals Diagram showing the phase difference of multiple signals Diagram showing the phase difference of multiple signals

  Hereinafter, examples of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments.

  In this embodiment, a liquid crystal projector will be described as an example of a video display device.

  As a liquid crystal projector, a single-plate type, a three-plate type, and the like are generally known, but either type may be used. The same effect can be obtained with a DLP projector using a display device such as a DMD (Digital Mirror Device) as the projection type display device. A liquid crystal projector is taken as an example, but the same effect can be obtained with a direct-view display.

  The liquid crystal projector of this embodiment presents an image to the user by controlling the light transmittance of the liquid crystal element according to the image to be displayed and projecting the light from the light source that has passed through the liquid crystal element onto the screen. Do. In particular, a liquid crystal projector capable of receiving a plurality of videos and switching between a single display that displays one received signal and a multi-display that displays a plurality of signals simultaneously will be described below.

<Overall configuration>
First, FIG. 1 shows the connection between various video output devices and the liquid crystal projector 100 of this embodiment. The liquid crystal projector 100 is connected to four video output devices (media player 201, network camera 202, car-type video output device 203, personal computer 204) via video cables. The entire configuration of the liquid crystal projector 100 of this embodiment will be described with reference to FIG. 4 (a).

  FIG. 4A is a diagram showing an overall configuration of the liquid crystal projector 100 of the present embodiment. The liquid crystal projector 100 according to this embodiment includes a CPU 110, a ROM 111, a RAM 112, an operation unit 113, an image input unit 130, and an image processing unit 140. The liquid crystal projector 100 further includes a liquid crystal control unit 150, liquid crystal elements 151R, 151G, and 151B, a light source control unit 160, a light source 161, a color separation unit 162, a color composition unit 163, an optical system control unit 170, a projection optical system 171, an internal A bus 199 is provided. The liquid crystal projector 100 may further include a recording / reproducing unit 191, a recording medium 192, a communication unit 193, an imaging unit 194, a display control unit 195, and a display unit 196. Each component will be described below.

  The CPU 110 controls each operation block of the liquid crystal projector 100. The ROM 111 is for storing a control program describing the processing procedure of the CUP 110. The RAM 112 temporarily stores a control program and data as a work memory. In addition, the CPU 110 temporarily stores still image data and moving image data reproduced from the recording medium 192 by the recording / reproducing unit 191 in the RAM 112, and reproduces each image and video using a program stored in the ROM 111. You can also Further, the CPU 110 can temporarily store still image data and moving image data received from the communication unit 193 in the RAM 112, and can reproduce each image and video using a program stored in the ROM 111. In addition, an image or video obtained by the imaging unit 194 can be temporarily stored in the RAM 112, converted into still image data or moving image data using a program stored in the ROM 111, and recorded on the recording medium 192. .

  The operation unit 113 receives a user instruction and transmits an instruction signal to the CPU 110, and includes, for example, a switch, a dial, a touch panel provided on the display unit 196, and the like. For example, the operation unit 113 may be a signal receiving unit (such as an infrared receiving unit) that receives a signal from a remote controller and transmits a predetermined instruction signal to the CPU 110 based on the received signal. The CPU 110 also receives control signals input from the operation unit 113 and the communication unit 193 to control each operation block of the liquid crystal projector 100.

  The image input unit 130 receives a video signal from an external device, and includes, for example, a composite terminal, an S video terminal, a D terminal, a component terminal, an analog RGB terminal, a DVI-I terminal, a DVI-D terminal, an HDMI terminal, Including DP terminal. When an analog video signal is received, the received analog video signal is converted into a digital video signal, digital serial data such as HDMI is converted into a parallel digital video signal, and the converted video signal is sent to the image processing unit 140. Send. Here, the external device may be any device such as a personal computer, a camera, a mobile phone, a smartphone, a hard disk recorder, or a game machine as long as it can output a video signal. In the present embodiment, as shown in FIG. 1, the media player 201, the network camera 202, the car-type video output device 203, and the personal computer 204 are external devices.

  A characteristic configuration of the image input unit 130 in this embodiment will be described with reference to FIG.

  As shown in FIG. 4B, in this embodiment, the image input unit 130 has four HDMI video input terminals 131 and four receiving circuits 132, and a bus control unit 133.

  The video input terminal 131 is connected to the receiving circuit 132. The receiving circuit 132 converts the received TMDS signal into a digital parallel video signal. The reception circuit 132 includes a circuit that measures format information such as resolution, frequency, color space, and bit depth of the received video signal, and a circuit that acquires auxiliary information such as AVIInofFrame. The receiving circuit 132 has a function of acquiring information on a signal source that has transmitted video. Although the output from the receiving circuit 132 is a digital parallel video signal in this embodiment, a serial signal transmission protocol such as LVDS may be used. In this embodiment, the number of inputs is four, but two or more may be used.

  The bus control unit 133 converts the digital parallel video signal to an internal bus. The CPU 111 also controls switching of video signals to be transmitted to the bus 199 in accordance with instructions for single display, multi display, and quad display described later from the CPU 111. When HDMI1 or HDMI2 is displayed in a single display, only the selected video signal is transmitted to the bus 199. In the case of multi-display of HDMI1 and HDMI2 or HDMI3 and HDMI4, the two selected video signals are transmitted to the bus 199. In the case of quad display of HDMI1, HDMI2, HDMI3, and HDMI4, the selected four video signals are transmitted to the bus 199. Although only the selected video is transmitted to the bus control unit 133 in this embodiment, the video selection may be performed by the image processing unit 140 or the like in the subsequent stage. The bus control unit 133 also analyzes the video signal transmitted from the receiving circuit 132. This analysis is a phase difference detection of the synchronization signal of each input video signal, and an image analysis which detects whether the video at each end of each video signal is continuous. Details will be described later.

  In this embodiment, the media players 201 and 131a, the network cameras 202 and 131b, the car-type video output devices 203 and 131c, and the personal computers 204 and 131d are connected.

  The image processing unit 140 arranges the video signal received by the video input unit 130 and transmitted via the internal bus 199 based on the layout information. Further, the image processing unit 140 performs a changing process such as the number of frames, the number of pixels, and the image shape, and transmits the changed processing to the liquid crystal control unit 150. The image processing unit 140 is composed of, for example, a microprocessor for image processing. Further, the image processing unit 140 does not need to be a dedicated microprocessor. For example, the CPU 110 may execute the same processing as the image processing unit 140 by a program stored in the ROM 111. The image processing unit 140 can execute functions such as layout arrangement processing, frame thinning processing, frame interpolation processing, resolution conversion processing, distortion correction processing (keystone correction processing), and affine transformation such as image movement and rotation. . Further, the image processing unit 140 can perform a deformation process on the video signal output to the liquid crystal control unit 150. The layout arrangement process is to arrange the video transmitted from the video input unit 130 via the internal bus 199 as shown in FIGS. 6B, 6C, and 6D.

  The image processing unit 140 can also perform the above-described processing on an image or video reproduced by the CPU 110 in addition to the video signal received from the video input unit 130. For example, in the case of HDMI1 and HDMI2 PbyP display shown in FIG. 6B, the above-described image processing may be applied to both images at once or separately for both images.

  The liquid crystal control unit 150 controls the voltage applied to the liquid crystal of the pixels of the liquid crystal elements 151R, 151G, and 151B based on the video signal processed by the image processing unit 140, and the liquid crystal elements 151R, 151G, and 151B. It adjusts the transmittance and consists of a control microprocessor. Further, the liquid crystal control unit 150 does not need to be a dedicated microprocessor. For example, the CPU 110 may execute the same processing as the liquid crystal control unit 150 by a program stored in the ROM 111. For example, when a video signal is input to the image processing unit 140, the liquid crystal control unit 150 causes the liquid crystal element to have a transmittance corresponding to the image every time an image of one frame is received from the image processing unit 140. 151R, 151G, and 151B are controlled. The liquid crystal element 151 </ b> R is a liquid crystal element corresponding to red, and out of the light output from the light source 161, the light separated into red (R), green (G), and blue (B) by the color separation unit 162. Among them, it is for adjusting the transmittance of red light. The liquid crystal element 151 </ b> G is a liquid crystal element corresponding to green, and out of the light output from the light source 161, the light separated into red (R), green (G), and blue (B) by the color separation unit 162. Among them, it is for adjusting the transmittance of green light. The liquid crystal element 151 B is a liquid crystal element corresponding to blue, and of the light output from the light source 161, the light separated into red (R), green (G), and blue (B) by the color separation unit 162. Among them, it is for adjusting the transmittance of blue light.

  The light source control unit 160 controls on / off of the light source 161 and controls the amount of light, and includes a control microprocessor. Further, the light source control unit 160 does not need to be a dedicated microprocessor. For example, the CPU 110 may execute the same processing as the light source control unit 160 by a program stored in the ROM 111. The light source 161 outputs light for projecting an image on a screen (not shown), and may be, for example, a halogen lamp, a xenon lamp, a high-pressure mercury lamp, or the like. The color separation unit 162 separates light output from the light source 161 into red (R), green (G), and blue (B), and includes, for example, a dichroic mirror or a prism. In addition, when using LED etc. corresponding to each color as the light source 161, the color separation part 162 is unnecessary. The color synthesis unit 163 synthesizes red (R), green (G), and blue (B) light transmitted through the liquid crystal elements 151R, 151G, and 151B, and includes, for example, a dichroic mirror or a prism. . Then, light obtained by combining the red (R), green (G), and blue (B) components by the color combining unit 163 is sent to the projection optical system 171. At this time, the liquid crystal elements 151 </ b> R, 151 </ b> G, and 151 </ b> B are controlled by the liquid crystal control unit 150 so as to have a light transmittance corresponding to the image input from the image processing unit 140. Therefore, when the light combined by the color combining unit 163 is projected onto the screen by the projection optical system 171, an image corresponding to the image input by the image processing unit 140 is displayed on the screen. In this embodiment, the projected image is projected on the screen.

  The optical system control unit 170 controls the projection optical system 171 and includes a control microprocessor. The optical system control unit 170 does not have to be a dedicated microprocessor. For example, the CPU 110 may execute the same processing as the optical system control unit 170 by a program stored in the ROM 111. The projection optical system 171 is for projecting the combined light output from the color combining unit 163 onto the screen, and includes a plurality of actuators for driving the lens. Enlargement, reduction, focus adjustment, etc. can be performed.

  The recording / reproducing unit 191 reproduces still image data and moving image data from the recording medium 192, and receives still image data and moving image data of images and videos obtained by the imaging unit 194 from the CPU 110 and stores them in the recording medium 192. It is something to record. Still image data and moving image data received from the communication unit 193 may be recorded on the recording medium 192. The recording / reproducing unit 191 includes, for example, an interface electrically connected to the recording medium 192 and a microprocessor for communicating with the recording medium 192. The recording / reproducing unit 191 does not need to include a dedicated microprocessor. For example, the CPU 110 may execute the same processing as the recording / reproducing unit 191 by a program stored in the ROM 111. The recording medium 192 can record still image data, moving image data, and other control data necessary for the liquid crystal projector of this embodiment, and can be used for any kind of magnetic disk, optical disk, semiconductor memory, etc. It may be a recording medium of a system, and may be a removable recording medium or a built-in recording medium.

  The communication unit 193 is for receiving control signals, still image data, moving image data, and the like from an external device. For example, the communication unit 193 may be a wireless LAN, a wired LAN, USB, Bluetooth (registered trademark), or the like. The method is not particularly limited. Further, if the terminal of the image input unit 130 is, for example, an HDMI terminal, CEC communication may be performed via the terminal. Here, the external device may be any device such as a personal computer, a camera, a mobile phone, a smartphone, a hard disk recorder, a game machine, or a remote controller as long as it can communicate with the liquid crystal projector 100. .

  The imaging unit 194 captures an image signal by capturing the periphery of the liquid crystal projector 100 of the present embodiment, and can capture an image projected through the projection optical system 171 (capture the screen direction). . The imaging unit 194 transmits the obtained image or video to the CPU 110, and the CPU 110 temporarily stores the image or video in the RAM 112, and converts it into still image data or moving image data based on a program stored in the ROM 111. Convert. An imaging unit 194 includes an actuator for driving a lens for acquiring an optical image of a subject, a microprocessor for controlling the actuator, an imaging element for converting an optical image acquired through the lens into an image signal, and an image signal obtained by the imaging element And an AD conversion unit for converting the signal into a digital signal. In addition, the imaging unit 194 is not limited to capturing the screen direction, and for example, the viewer side in the direction opposite to the screen may be captured.

  The display control unit 195 controls the display unit 196 provided in the liquid crystal projector 100 to display an image such as an operation screen or a switch icon for operating the liquid crystal projector 100, and is a micro that performs display control. It consists of a processor. Further, the microprocessor need not be a microprocessor dedicated to the display control unit 195. For example, the CPU 110 may execute the same processing as the display control unit 195 by a program stored in the ROM 111. The display unit 196 displays an operation screen and switch icons for operating the liquid crystal projector 100. The display unit 196 may be anything as long as it can display an image. For example, it may be a liquid crystal display, a CRT display, an organic EL display, or an LED display. Further, in order to post a specific button so that the user can recognize it, an LED or the like corresponding to each button may be made to emit light.

  An internal bus 199 is a bus for transmitting image data, various control signals and the like inside the liquid crystal projector 100, and is connected to each control block as shown in FIG.

  Note that the image processing unit 140, the liquid crystal control unit 150, the light source control unit 160, the optical system control unit 170, the recording / playback unit 191 and the display control unit 195 of the present embodiment perform the same processing as those of these blocks. There may be one or more microprocessors capable. Alternatively, for example, the CPU 110 may execute the same processing as each block by a program stored in the ROM 111. In addition, according to a plurality of projection modes, the CPU 110 changes various parameters of the image processing unit 140 and controls the light source control unit 160 to increase or decrease the brightness of the light source.

<Basic operation>
Next, the basic operation of the liquid crystal projector 100 of this embodiment will be described with reference to FIGS. 4 (a) and 5 (a).

  FIG. 5A is a flowchart for explaining the control of the basic operation of the liquid crystal projector 100 of the present embodiment. The operation shown in FIG. 5A is basically executed by the CPU 110 controlling each functional block based on a program stored in the ROM 111. The flowchart in FIG. 5A starts when the user instructs the liquid crystal projector 100 to be turned on by the operation unit 113 or a remote controller (not shown).

  When the user instructs the power supply of the liquid crystal projector 100 to be turned on by the operation unit 113 or the remote control shown in FIG. 4C, the CPU 110 controls a power supply unit (not shown) and starts supplying power to each unit of the projector 100.

  Next, the CPU 110 determines the display mode selected by the user operating the operation unit 113 or the remote controller (S100). One of the display modes of the projector 100 of the present embodiment is an “input image display mode” for displaying an image input from the image input unit 130. In addition, one of the display modes of the projector 100 according to the present embodiment is a “file playback display mode” for displaying still image data or moving image data or video read from the recording medium 192 by the recording / playback unit 191. . In addition, one of the display modes of the projector 100 according to the present embodiment is a “file reception display mode” in which an image or video of still image data or moving image data received from the communication unit 193 is displayed. In the present embodiment, the case where the display mode is selected by the user will be described. However, the display mode at the time of turning on the power may be the display mode at the end of the previous time. The display mode of some may be the default display mode. In that case, the process of S100 can be omitted.

  Here, it is assumed that “input image display mode” is selected in S100. When the “input image display mode” is selected, the CPU 110 determines from the display layout information whether the image to be displayed is one or more (S110). This display layout information is a single display that displays one video signal when not specified by the user, but when the user gives an instruction to select a layout for multiple display using the operation unit 113 or the remote control, the number of terminals to be displayed is Thus, it is determined whether a video is input from the image input unit 130.

  First, single display of HDMI will be described. It is determined whether an image is input from the receiving circuit 132a (S120). If no input is made (No in S120), the CPU 110 waits until an input is detected. If input is made (Yes in S120), the CPU 110 executes a projection process (S150).

  The CPU 110 transmits the video input from the image input unit 130 to the image processing unit 140 as projection processing (S150).

  Next, the multi-display of HDMI1 and HDMI2 will be described. If the user has selected multi-display in S110, it is determined whether or not an image is input from the receiving circuit 132a and the receiving circuit 132b (S130). If it is not input (No in S130), the CPU 110 waits until input is detected. If it is input, the CPU 110 displays a video signal to be displayed from the display layout information as shown in FIG. It arrange | positions like b), FIG.6 (c), and FIG.6 (d) (S140). Since this time is a multi-display of HDMI1 and HDMI2, the layout of the input video is determined as shown in FIG. After the layout is determined, the CPU 110 transmits the video input from the image input unit 130 to the image processing unit 140 as projection processing (S150).

  Thereafter, the image processing unit 140 executes functions such as frame thinning processing, frame interpolation processing, resolution conversion processing, distortion correction processing (keystone correction processing), and affine transformation such as image movement and rotation, and the processed video is processed. It transmits to the liquid crystal control unit 150. Then, the CPU 110 causes the liquid crystal control unit 150 to have a transmittance corresponding to the gradation level of each color component of red (R), green (G), and blue (B) of the received image for one screen. The transmittance of the liquid crystal panels 151R, 151G, and 151B is controlled. Then, the CPU 110 causes the light source control unit 160 to control the output of light from the light source 161. The color separation unit 162 separates the light output from the light source 161 into red (R), green (G), and blue (B), and supplies each light to the liquid crystal panels 151R, 151G, and 151B. The light of each color supplied to the liquid crystal panels 151R, 151G, and 151B has a limited amount of light transmitted through each pixel of each liquid crystal panel. Then, the red (R), green (G), and blue (B) lights transmitted through the liquid crystal panels 151R, 151G, and 151B are supplied to the color synthesis unit 163 and synthesized again. The light combined by the color combining unit 163 is projected onto a screen (not shown) via the projection optical system 171.

  This projection processing (S150) is sequentially executed for each image of one frame while the image is projected.

  At this time, when an instruction to operate the projection optical system 171 is input from the operation unit 113 by the user, the CPU 110 changes the focus of the projection image or sets the magnification of the optical system to the optical system control unit 170. The actuator of the projection optical system 171 is controlled so as to be changed.

  During this projection process (S150), the CPU 110 determines whether an instruction to switch the display mode is input from the operation unit 113 by the user (S160). Here, when an instruction to switch the display mode is input from the operation unit 113 by the user (Yes in S160), the CPU 110 returns to S110 again and determines the display mode. At this time, the CPU 110 transmits a menu screen for selecting the display mode to the image processing unit 140 as an OSD image, and controls the image processing unit 140 to superimpose the OSD screen on the image being projected. Do. The user selects a display mode while viewing the projected OSD screen.

  On the other hand, when an instruction to switch the display mode is not input from the operation unit 113 by the user during the projection process (S150) (No in S160), the CPU 110 determines whether an instruction to end projection is input from the operation unit 113 by the user. It is determined whether or not (S170). Here, when an instruction to end projection is input from the operation unit 113 by the user (Yes in S170), the CPU 110 stops power supply to each block of the projector 100 and ends image projection. On the other hand, when the projection end instruction is not input from the operation unit 113 by the user (No in S170), the CPU 110 returns to S120, and thereafter, until the user inputs the projection end instruction from the operation unit 113. The processes from S120 to S170 are repeated.

  As described above, the liquid crystal projector 100 of this embodiment projects an image on the screen.

  In the “file playback display mode”, the CPU 110 causes the recording / playback unit 191 to read a file list of still image data and moving image data and thumbnail data of each file from the recording medium 192 and temporarily store them in the RAM 112. . The CPU 110 generates a character image based on the file list temporarily stored in the RAM 112 and an image based on the thumbnail data of each file based on the program stored in the ROM 111, and transmits the image to the image processing unit 140. Then, the CPU 110 controls the image processing unit 140, the liquid crystal control unit 150, and the projection control unit 160 in the same manner as the normal projection processing (S150).

  Next, an instruction to select characters and images respectively corresponding to still image data and moving image data recorded on the recording medium 192 is input through the operation unit 113 on the projection screen. Then, the CPU 110 controls the recording and reproducing unit 191 to read out the selected still image data and moving image data from the recording medium 192. The CPU 110 temporarily stores the read still image data and moving image data in the RAM 112, and reproduces the image and video of the still image data and moving image data based on the program stored in the ROM 111.

  Then, for example, the CPU 110 sequentially transmits the reproduced moving image data to the image processing unit 140, and controls the image processing unit 140, the liquid crystal control unit 150, and the projection control unit 160 in the same manner as the normal projection processing (S150). Do. In addition, when the still image data is reproduced, the reproduced image is transmitted to the image processing unit 140, and the image processing unit 140, the liquid crystal control unit 150, and the projection control unit 160 are set in the same manner as the normal projection processing (S130). Control.

  In the “file reception display mode”, the CPU 110 temporarily stores still image data and moving image data received from the communication unit 193 in the RAM 112, and stores the still image data and moving image data based on the program stored in the ROM 111. Play back images and videos. Then, for example, the CPU 110 sequentially transmits the reproduced moving image data to the image processing unit 140, and controls the image processing unit 140, the liquid crystal control unit 150, and the projection control unit 160 in the same manner as the normal projection processing (S150). Do. When the still image data is reproduced, the reproduced image is transmitted to the image processing unit 140, and the image processing unit 140, the liquid crystal control unit 150, and the projection control unit 160 are transmitted in the same manner as the normal projection processing (S150). Control.

  Next, the user operates the remote control in FIG. 4C to activate the liquid crystal projector 100 to display the HDMI1 signal, and thereafter the operation sequence of the CPU 110 that has received the remote control operation until the display is switched to HDMI3 is shown in FIG. Will be described. Liquid crystal projector 100 receives power-on by a user's remote control operation (YES in S201), and performs a system initialization process (S202). The power-on control is various initialization processes for the internal block of the liquid crystal projector 100. After S202, the video input terminal 131a (HDMI 1) that was selected when the power was turned off last time is selected as the video input terminal to be displayed on the liquid crystal projector 100, and the bus control unit 133 is switched (S203), and the video input terminal 131a is connected. The video receiving circuit 132a that is input measures the input video signal (S204). The CPU 110 acquires input video signal information from the video receiving circuit 132a. Based on the acquired information, the image processing unit 140 and the display control unit 195 are controlled to perform enlargement / reduction processing, keystone correction, display panel driver setting, and output an input video of HDMI 1 (S205). Hereinafter, the video output process of the selected video terminal is the same as that of the other input terminals, and therefore the description of the image output process is omitted.

  After S205, when switching from the HDMI 1 to another video terminal occurs by the user operation (Yes in S206), the process proceeds to S203 and switches to the video from the selected input terminal. In the present embodiment, a case where HDMI 1 is switched to HDMI 3 after display will be described. Once HDMI 1 is displayed, pressing the “input” button of the remote control in FIG. 4C once displays the input selection OSD as shown in FIG. 7A superimposed on the displayed HDMI 1. The situation is shown in FIG. 7 (c). Thereafter, the display is switched from FIG. 7C to FIG. 7D to FIG. 7E by continuously pressing the “input” button. The CPU 110 detects continuous pressing of the “input” button (existing 206), and performs an HDMI3 display selection process in S203. Specifically, the bus control 133 is switched to the video from the reception circuit 132c (described in S203). After switching, the HDMI 3 signal information is acquired from the receiving circuit 132c (existing 204). Since the image output process in S205 is the same as that in the HDMI1 display described above, a description thereof will be omitted. When the “input” button is pressed after HDMI3 display, the HDMI4 single display in FIG. 7F, the HDMI1 & HDMI2 multidisplay in FIG. 7G, the HDMI3 & HDMI4 multidisplay in FIG. The display is changed to the quad display of HDMI1-4 in FIG. When the “input” button is pressed in FIG. 7 (i), the display transitions to the HDMI 1 of FIG. 7 (c).

  In the case of No in S206, signal information of non-display signals HDMI1, HDMI2, and HDMI4 is acquired from each of the receiving circuits 132a, 132b, and 132d (S207). These signal information may be displayed as signal information on each video terminal of the input selection OSD as shown in FIG. 7B. After S207, it is confirmed in S208 whether or not the user instructs to turn off the power. If it is not instructed to turn off the power, transition is made before S206, and if it is instructed to turn off the power, the process to turn off the power (S209) )I do.

<Characteristic operation explanation>
In this embodiment, using FIG. 5 (c) and FIG. 4 (c), the “input” button on the remote controller is operated to switch the single display of the HDMI1 signal to the multi-display of HDMI3 & HDMI4 at the time of display. A typical operation will be described. It is assumed that video signals are input to HDMI1, HDMI2, HDMI3, and HDMI4, and an operation sequence of the CPU 110 after HDMI1 display will be described.

  As shown in FIG. 6A, after HDMI1 is displayed, signal information of HDMI2, HDMI3, and HDMI4 is acquired (S301). The signal information is a resolution, a frequency, a blanking period, and a phase difference of a vertical synchronizing signal with respect to each input video. Here, the phase difference of the vertical synchronization signal will be described. The phase difference referred to here is a shift amount of the vertical synchronizing signal as shown in FIG. For example, in FIG. 8A, it can be seen that the phase difference of the synchronization signal is all within 100 usec in HDMI 1-4. In FIG. 8B, it can be seen that the phase difference between the synchronization signals of HDMI1 and HDMI2 is 200 usec, and the phase difference between HDMI3 and HDMI4 is 2.1 msec. In FIG. 8C, it can be seen that the phase difference between HDMI1 and HDMI2 is 1 msec, and the phase difference between HDMI3 and HDMI4 is 150 usec. In FIG. 8D, it can be seen that the phase difference between HDMI1 and HDMI2 is 1 msec, and the phase difference between HDMI3 and HDMI4 is 750 usec.

  In the present embodiment, the OSD for input switching and the display selection operation are changed according to the phase difference.

After measuring the phase difference together with the signal information in S301, it is determined whether or not the measured phase difference is small (S302). When each phase difference in S302 is as shown in FIG. 8D and the phase difference between HDMI 1 and HDMI 2 and the phase difference between HDMI 3 and HDMI 4 both exceed 250 usec, the OSD displayed in the input selection is as shown in FIG. It remains (S303). As shown in FIG. 8A, when the phase difference between HDMI 1 and HDMI 2 and HDMI 3 and HDMI 4 is 250 usec or less, as shown in FIG. 7J, a quad display for displaying one screen with four HDMIs of HDMI 1-4. The selection OSD is placed under HDMI1. When the phase difference between HDMI 1 and HDMI 2 is 200 usec and the phase difference between HDMI 3 and HDMI 4 is 2.1 msec as shown in FIG. 8B, one screen is displayed with two HDMI 1 and 2 HDMI as shown in FIG. A multi-display selection OSD to be displayed is placed under HDMI1. When the phase difference between HDMI 1 and HDMI 2 is 2 msec and the phase difference between HDMI 3 and HDMI 4 is 150 usec as shown in FIG. 8C, one screen is displayed with two HDMI 3 & 4 HDMI as shown in FIG. A multi-display selection OSD is placed below HDMI1.
After the OSD screen for input selection is determined (after S303 and S304), when pressing of the "input" button on the remote control is detected (S305), the CPU 110 selects the input selection OSD determined in S303 and S304 in FIG. It superimposes and displays (S306). When it is detected that the "input button" on the remote control is pressed in the input selection OSD display state (S307), the video display is shown in FIG. 6 (g) according to the layout linked to the OSD arranged under HDMI1. The input is switched (S308).

  In this embodiment, HDMI 3 & 4 are displayed. When the phase difference of the synchronization signal is FIG. 8B, FIG. 6E is HDMI 1 & 2, and when the phase difference of the synchronization signal is FIG. It switches to the display layout of FIG.6 (g) which is four.

Although the phase difference is set to 250 usec or less in this embodiment, the value may be variable depending on the system. Further, although the number of video input terminals is four in the present embodiment, the number is not limited to this as long as it is plural. Further, in the present embodiment, the display order of the input selection OSD is changed according to the phase difference of the synchronization signal, and the switching operation is also changed. However, the display order of the input selection OSD may be changed as it is. . In this embodiment, input switching is performed in response to a user's remote control operation. However, input may be switched without detecting the pressing of the “input” button at the time of startup or the like. In that case, the configuration in which the priority is displayed with more input terminals may be the first priority, and thereafter the priority may be lowered with the configuration in which the display is performed with fewer input terminals.
As described above, the liquid crystal projector 100 according to this embodiment can switch from single display to multi display or quad display with few operations by estimating single display, multi display, and quad display from the synchronization signal phase difference of the input signal. The effect that can be achieved.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

[Other Examples]
It goes without saying that the object of the present invention can also be achieved by supplying a storage medium storing program code of software that implements the functions of the above-described embodiments to the apparatus. At this time, a computer (or a CPU or an MPU) including the supplied control unit of the apparatus reads out and executes the program code stored in the storage medium.

  In this case, the program code itself read out from the storage medium realizes the functions of the above-described embodiments, and the program code itself and the storage medium storing the program code constitute the present invention.

  As a storage medium for supplying the program code, for example, a flexible disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a CD-R, a magnetic tape, a non-volatile memory card, a ROM or the like can be used.

  Also, based on the instructions of the program code described above, an OS (a basic system or an operating system) or the like running on the device performs a part or all of the processing, and the processing of the above-described embodiment is realized by the processing. It goes without saying that the case is included.

  Furthermore, even when the program code read out from the storage medium is written to the memory provided to the function expansion board inserted into the device or the function expansion unit connected to the computer, and the functions of the above-described embodiments are realized. It goes without saying that it is included. At this time, based on the instruction of the program code, the CPU or the like provided in the function expansion board or function expansion unit performs part or all of the actual processing.

Liquid crystal projector 100, CPU 110, ROM 111, RAM 112,
Operation unit 113, image input unit 130, image processing unit 140, liquid crystal control unit 150,
Liquid crystal element 151, light source control unit 160, light source 161, color separation unit 162,
Color synthesis unit 163, optical system control unit 170, projection optical system 171,
Recording and reproducing unit 191, recording medium 192, communication unit 193, display control unit 195,
Display section 196, internal bus 199, video input terminal 131,
Input signal receiving circuit 132, bus control unit 133

Claims (6)

In the display device that displays the received video signal,
A plurality of video receiving means for receiving video signals;
A determination unit that determines whether a plurality of images received by the image receiving unit are image signals from the same signal source;
With
Priority for switching between a first display method for displaying one video signal received by the video receiving means and a second display method for simultaneously displaying two or more received videos according to the determination result of the determination means And a control unit configured to control to change. The display device according to claim 1, wherein the determination unit detects a degree of adjacent pixel values of a plurality of received video signals. The display device according to claim 1, wherein the determination unit detects a phase difference between synchronization signals of a plurality of received video signals. The said control means changes the display order of the choice in the selection screen for selecting either a 1st display method or a 2nd display method based on the said priority, The said display means The display device according to any one of 3. The control means sequentially changes the display order of the options on the screen of the selection means of the video signal based on the priority in order to select one of the first display method and the second display method. The display device according to claim 1, wherein the display device is a display device. A display control method for displaying a received video signal;
A video receiving step of receiving a plurality of video signals;
A determining step of determining whether the plurality of videos received in the video receiving step are video signals from the same signal source;
With
Priority for switching between a first display method for displaying one video signal received in the video reception step and a second display method for simultaneously displaying two or more received videos according to the determination result of the determination step A control step of controlling to change the display control method.