JP2012054700A - Display apparatus, information processing apparatus, method of controlling display apparatus, method of controlling information processing apparatus, display control program, and information processing program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To optimize a video display and automate repair to a video display.SOLUTION: A display apparatus (2) for receiving a display signal from an information processing apparatus to display video includes a display section (6), a state information generation section (4) and a notification circuit (8). The display section (6) displays video according to the display signal. The state information generation section (4) generates state information representing the display state of the display section. The notification circuit (8) notifies the state information generated by the state information generation section to the information processing apparatus.

Description

  The present invention relates to display of a display signal. For example, a display device that maintains a generated display signal or generates or displays a new display signal, an information processing device, a display device control method, an information processing device control method, and display control The present invention relates to a program and an information processing program.

  Due to the development of video signal display technology, video display is used in various situations. As this video display, for example, a video signal transmitted from a television (TV) broadcasting station is displayed, or a computer and a display device are connected, and a video signal is transmitted from the computer to an external display device to display the video signal. It is known to do. It is also known to display a video signal of a device that outputs a video (for example, Patent Document 1 and Patent Document 2).

Along with the diversification of the use of video display, for example, data encryption is performed (for example, Patent Document 3), and the size of characters to be displayed is converted to a size that is easy for the user to see in connection with video display. This is known (for example, Patent Document 4). Furthermore, it is known to display on a TV receiver instead of a monitor display of a personal computer (for example, Patent Document 5 and Patent Document 6).

JP 2008-158220 A JP 2007-047532 A JP 2006-163629 A JP 2006-184415 A JP 7-129138 A JP 2006-107909 A

  By the way, when supplying a video signal to the display device, if a video signal that cannot be displayed by the display device is sent due to an incorrect operation or replacement of the display device, a distorted video is displayed. For example, when a video signal that cannot be displayed is sent from the computer, the display device has a problem that the image is disturbed in the oblique direction and the image blinks. Alternatively, the display is controlled on the display device side, the display is stopped, and the display is not performed. When such a state occurs, a normal screen is not displayed, so that the user cannot operate based on the computer screen and cannot return to the normal state. Therefore, the user forcibly turns off the power by operating the power button of the computer, and restarts in a low resolution mode of Windows (registered trademark) as a minimum display state of the OS (Operating System). The display device must be set again. Alternatively, the user connects to another display device that can be displayed, and changes the setting to display on the original display.

  Therefore, the purpose of the display device, information processing device, display device control method, information processing device control method, display control program, and information processing program of the present disclosure is to optimize video display.

In addition, another object of the display device, the information processing device, the control method of the display device, the control method of the information processing device, the display control program, and the information processing program of the present disclosure is to automate the video display restoration process.

  In order to achieve the above object, a display device according to the present disclosure is a display device that displays a video by receiving a display signal from an information processing device, and includes a display unit, a state information generation unit, and a notification circuit. The display unit displays an image according to the display signal. The state information generation unit generates state information indicating the display state of the display unit. The notification circuit notifies the information processing apparatus of the state information generated by the state information generation unit.

  In order to achieve the above object, an information processing apparatus according to the present disclosure is an information processing apparatus that sends a display signal to an externally connected display device, and includes a state information reception unit and a display signal generation unit. The state information receiving unit receives state information indicating the display state from the display device. The display signal generation unit receives the status information received by the status information reception unit, thereby maintaining the display signal currently being sent or generating a new display signal.

  In order to achieve the above object, a display device control method according to the present disclosure is a display device control method that receives a display signal and displays an image, and receives the display signal from the information processing device and receives the image of the display signal. Is displayed. Status information representing the video display status is generated. Status information is notified to the information processing apparatus.

  In order to achieve the above object, a control method for an information processing apparatus according to the present disclosure is a control method for an information processing apparatus that transmits a display signal, and transmits the display signal to an externally connected display device. Status information indicating the display status is received from the display device. Further, by receiving the status information, the display signal currently being transmitted is maintained or a new display signal is generated.

  In order to achieve the above object, a display control program of the present disclosure is a display control program that is executed by a computer of a display device, and receives display signals from the information processing device and generates state information indicating a display state. In addition, an image is displayed by a display signal.

In order to achieve the above object, an information processing program of the present disclosure is an information processing program executed by a computer of an information processing apparatus that transmits a display signal, and transmits the display signal to an externally connected display apparatus. In addition, by receiving state information indicating the display state from the display device, the display signal currently being transmitted is maintained or a new display signal is generated.

  According to the display device, the information processing device, the control method of the display device, the control method of the information processing device, the display control program, and the information processing program of the present disclosure, any of the following effects can be obtained.

  (1) It is possible to receive state information from the display device and optimize video display based on the state information.

  (2) A displayable video signal is output under the control of the information processing apparatus, and the video display is restored.

  (3) Automatic restoration of video display.

Other objects, features, and advantages of the present invention will become clearer with reference to the accompanying drawings and each embodiment.

It is a figure which shows an example of the display apparatus which concerns on 1st Embodiment. It is a flowchart which shows an example of the display process which concerns on 1st Embodiment. It is a figure which shows an example of the information processing apparatus which concerns on 2nd Embodiment. It is a flowchart which shows an example of the video processing which concerns on 2nd Embodiment. It is a figure which shows an example of the video display system which concerns on 3rd Embodiment. It is a figure which shows an example of an HPD signal. It is a figure which shows an example of a computer and a display apparatus. It is a figure which shows the structural example of a memory. It is a figure which shows an example of the resolution table. It is a figure which shows an example of the function of the computer which concerns on 3rd Embodiment. It is a figure which shows the structural example of a scaler. It is a figure which shows an example of the command showing the success of a display. It is a figure which shows an example of the command showing the failure of a display. It is a figure which shows an example of the circuit which concerns on the detection of HPD It is a flowchart which shows an example of the control processing by the side of a computer. It is a flowchart which shows an example of the selection process of a resolution and a refresh rate. It is a flowchart which shows an example of the process by the side of a display apparatus. It is a sequence diagram which shows an example of the change process of a video signal. It is a figure which shows an example of the video display system which concerns on 4th Embodiment. It is a figure which shows the structural example of a screen data transmitter. It is a figure which shows an example of PC. It is a figure which shows the structural example of the memory of PC. It is a flowchart which shows an example of a process of a screen data transmitter. It is a flowchart which shows an example of a process of PC. It is a figure which shows an example of a process of reception data. It is a figure which shows an example of the video display system which concerns on 5th Embodiment. It is a figure which shows an example of a setting value table. It is a figure which shows an example of an overscan. It is a figure which shows an example of the image | video in the case of performing underscan. It is a figure which shows an example of a setting value It is a figure which shows an example of the function of software. It is a flowchart which shows an example of the change process of a setting value. It is a figure which shows an example of the command showing the failure of a display. It is a flowchart which shows an example of the process by the side of a display apparatus. It is a flowchart which shows an example of the selection process of resolution. It is a figure which shows an example of a structure of the screen data transmitter which concerns on other embodiment. It is a figure which shows an example of PC concerning other embodiment. It is a figure which shows the structural example of the memory of PC. It is a flowchart which shows an example of a process of a screen data transmitter. It is a flowchart which shows an example of a process of PC. It is a figure which shows an example of a process of reception data. It is a figure which shows an example of a setting screen. It is a figure which shows the structural example of the video display system using the mobile telephone which concerns on other embodiment. It is a figure which shows the structural example of the video display system using the recording / reproducing apparatus which concerns on other embodiment. It is a figure which shows an example of a structural example of the video display system using the game machine which concerns on other embodiment. It is a figure which shows an example of a comparative example.

[First Embodiment]

  The first embodiment will be described with reference to FIG. FIG. 1 is a diagram illustrating an example of a display device according to the first embodiment. The configuration shown in FIG. 1 is an example, and the present invention is not limited to such a configuration.

  The display device 2 is an example of a unit that displays an image, and includes a function of receiving a display signal from the information processing device 52 and notifying the information processing device 52 of state information indicating a display state. The state information is, for example, information indicating that the display has been successful, information indicating that the display has failed, or information indicating the cause of the display failure. The display signal is a signal supplied to the display device when displaying the video, and the displayed video is generated based on this display signal. The display signal is, for example, video data, and includes a video signal obtained by processing the video data for transmission / reception.

  The state information generation unit 4 is an example of a unit that generates state information indicating the display state of the display unit. The state information generation unit 4 determines the display state when the display signal is displayed on the display unit 6 and generates the display state information. This state information is notified to the information processing apparatus 52. In addition, the state information generation unit 4 displays the display signal on the display unit 6 when the video of the display signal can be displayed based on the determination of the display state. The display state is determined based on, for example, the resolution of the video displayed by the display signal, the refresh rate of the display signal, or information on both of these. The resolution information and the refresh rate information are examples of display setting information in a video or video signal.

  The resolution is represented by using the minimum unit elements constituting the video or image, that is, the number of pixels, and is represented, for example, by the product of the number of pixels in the horizontal direction and the vertical direction of the video. Names are provided for resolutions conforming to the VESA (Video Electronics Standards Association) standard. For example, the resolution with an image size of 1024 × 768 is called XGA (eXtended Graphics Array), and the resolution with an image size of 640 × 480 is called VGA (Video Graphics Array). Note that the size of the image is expressed as a product of the number of pixels in the horizontal direction of the image and the number of pixels in the vertical direction. For example, 1024 × 768 indicates that the number of pixels in the horizontal direction is 1024 and the number of pixels in the vertical direction is 768. Some display devices are adapted to a unique resolution that does not conform to the VESA standard. For example, a display device that displays an image having a resolution of 1400 × 1050 is a display device that does not comply with the VESA standard.

  The refresh rate is a value called a vertical synchronization frequency. The refresh rate represents the frequency of rewriting video. For example, when hertz [Hz] is used as a unit, it represents the number of times of video rewriting per second. A standard is set for the refresh rate. For example, when a display signal is sent to a TV receiver via HDMI (High-Definition Multimedia Interface), the refresh rate is 60 [Hz] in the Japanese standard and 50 [Hz] in Europe.

  The display unit 6 is an example of a unit that displays an image. The display unit 6 receives the display signal via the state information generation unit 4 and displays the video. The display unit 6 includes, for example, an LCD (Liquid crystal display), a CRT (Cathode Ray Tube), a plasma display, an organic EL display (Organic Electroluminescence Display), and the like as a screen for displaying an image.

  The notification circuit 8 is an example of means for notifying state information. The status information generated by the status information generation unit 4 is received and notified to the information processing device 52.

  Then, the display device 2 receives the display signal, determines the display state when displaying on the display unit 6, and generates the state information. Since this state information is notified to the information processing apparatus 52, the information processing apparatus 52 can recognize the display state of the display signal.

  Next, display processing of the display device will be described with reference to FIG. FIG. 2 is a flowchart illustrating an example of display processing according to the first embodiment. Note that the processing shown in FIG. 2 is an example, and the present invention is not limited to such processing.

  When the display signal is received (step S1), the display device 2 determines whether or not the video of the received display signal can be displayed on the display unit 6 (step S2). If the video can be displayed (YES in step S2), state information indicating the successful display is generated (step S3) and notified to the information processing device 52 (step S4). The state information generated in this case is information indicating that the display is successful, for example. The received display signal is displayed on the display unit 6 (step S5).

  If the video cannot be displayed (NO in step S2), status information indicating a display failure is generated (step S6) and notified to the information processing device 52 (step S7). The state information generated in this case is, for example, information indicating that display has failed or information indicating a cause that cannot be displayed. When the video display is not possible, after the status information is notified, the process returns to the reception of the display signal (step S1). The determination of whether or not the display signal can be displayed (step S2) is repeated until the display is successful and video display on the display unit 6 is performed. Thereby, it is possible to prevent a state in which no video is displayed on the display unit 6 from being maintained.

[Second Embodiment]

  For the second embodiment, reference is made to FIG. FIG. 3 is a diagram illustrating an example of an information processing apparatus according to the second embodiment. The configuration illustrated in FIG. 3 is an example, and the present invention is not limited to such a configuration. In FIG. 3, the same parts as those in FIG.

  The information processing device 52 is an example of a unit that generates and outputs a display signal, and includes a function of receiving state information for the display signal and maintaining the display signal being transmitted or generating a new display signal.

  The display signal generation unit 54 is an example of a unit that generates a display signal used for video display. The display signal generator 54 generates a display signal from the video display data by performing arithmetic processing based on display setting information such as video resolution information and refresh rate information, for example. The display signal generation unit 54 includes, for example, a GPU (Graphics Processing Unit). The GPU is a graphics chip that generates video and is suitable for generating a display signal.

  The state information receiving unit 56 is an example of a unit that receives display state information. The state information receiving unit 56 receives state information representing the display state of the display signal generated by the display signal generating unit 54 from the display device 2. When the state information receiving unit 56 receives the state information from the display device 2, it can be recognized whether or not the generated display signal can be displayed.

  Next, FIG. 4 is referred to regarding video processing of the information processing apparatus. FIG. 4 is a flowchart illustrating an example of video processing according to the second embodiment. Note that the processing shown in FIG. 4 is an example, and the present invention is not limited to such processing.

  When a display signal is generated from the video data based on the display setting information (step S21), the display signal is transmitted to the display device 2 (step S22). The display device 2 determines whether or not the video of the display signal can be displayed, and notifies the information processing device 52 of it. The state information receiving unit 56 receives this state information (step S23). Whether the display signal can be displayed is determined from the received status information (step S24). If it is determined that the display is possible (YES in step S24), the process is terminated. In this case, the display signal transmission state is maintained.

  If it is determined that display is not possible (NO in step S24), the process returns to display signal generation (step S21), and a new display signal is generated. The new display signal is generated using, for example, the changed display setting. The determination of whether display is possible from the generation of the display signal (steps S21 to S24) is repeated until it is determined that display is possible. Thereby, it is possible to prevent a state in which no video is displayed on the display device 2 from being maintained.

  As described above, in the second embodiment, when display is not possible due to the status information, a new display signal is generated to enable display on the display device 2. A display signal that can be displayed is output by the control processing of the information processing apparatus 52, and the display of the video is restored. As a result, the display of the video can be easily restored. In addition, by storing the format in which the display was successful, it is possible to output a display signal in the format in which the previous display was successful when the power is turned off and connected.

[Third Embodiment]

  The third embodiment will be described with reference to FIGS. 5, 6, 7, 8, 9, 10, 11, 12, and 13. FIG. 5 is a diagram illustrating an example of a video display system according to the third embodiment, FIG. 6 is a diagram illustrating an example of an HPD signal, and FIG. 7 is a diagram illustrating an example of a computer and a display device. FIG. 8 is a diagram illustrating a configuration example of a memory, FIG. 9 is a diagram illustrating an example of a resolution table, and FIG. 10 is a diagram illustrating an example of functions of a computer according to the third embodiment. FIG. 11 is a diagram illustrating a configuration example of a scaler, FIG. 12 is a diagram illustrating an example of a command indicating a display success, and FIG. 13 is a diagram illustrating an example of a command indicating a display failure. 5, 6, 7, 8, 9, 10, 11, 12, and 13 are merely examples, and the present invention is not limited to such structures. . 5 to 13, the same parts as those in FIGS. 1 and 3 are denoted by the same reference numerals.

  In the third embodiment, as shown in FIG. 5, a computer 102 and a display device 104 are connected by a connection cable 106 to constitute a video display system 107. The connection cable 106 transmits an HPD signal (Hot-Plug-Detect signal) 110 in addition to the video signal 108. The connection cable 106 may be a plurality of cables in which the transmission line for the video signal 108 and the transmission line for the HPD signal 110 are separated, or a cable in which these transmission lines are bundled. As the bundled cable, for example, a DVI (Digital Visual Interface) cable or an HDMI (High-Definition Multimedia Interface) cable is used. Note that DVI is a digital interface standard for connecting a computer and a display device, and HDMI is a digital video and audio input / output interface standard for home appliances and audiovisual equipment.

  In the case where the computer 102 and the display device 104 have an interface compliant with DVI, the computer 102 and the display device 104 are connected using a DVI cable compliant with DVI. Further, when the computer 102 and the display device 104 have an interface conforming to HDMI, the computer 102 and the display device 104 are connected using an HDMI cable conforming to HDMI. By using the DVI cable or the HDMI cable, the video signal, the audio signal, and the control signal can be transmitted with one cable.

The HPD signal 110 is a signal for detecting whether the display device 104 is connected. As shown in FIG. 6, the HPD signal 110 is maintained at the low voltage (V _GND ) when the display device 104 is not connected (period 112). When the display device 104 is connected at time T1, the high voltage (V _H ) is maintained (period 114). The threshold value of the HPD signal 110 is, for example, 2.4 [V], and the connection of the display device 104 is recognized when the voltage of the HPD signal 110 is 2.4 to 5 [V].

  The computer 102 is an example of a unit that processes display signals, and is an example of an information processing apparatus. As shown in FIG. 7, the memory 132, the GPU (Graphics Processing Unit) 136, the CPU (Central Processing Unit) 138, and the command receiving microcomputer 144 are connected by a signal path 146, and the GPU 136 and the transmitter 140 are connected by a signal path 148. Connecting. Further, a video random access memory (VRAM) 134 and a GPU 136 are connected by a signal path 149. Then, the GPU 136, the connection detection unit 142, and the command reception microcomputer 144 are connected through the signal path 150.

  The display device 104 is an example of a unit that displays an image, and is an example of a display device. Moreover, it is an example of the information processing apparatus which processes a video signal. The display device 104 is, for example, a TV receiver whose main purpose is to receive and display TV broadcasts, or a monitor whose main purpose is to display video output from an information processing device such as a computer. As shown in FIG. 7, the receiver 152, the scaler 154, the display unit 156, the command transmission microcomputer 158, and the connection response unit 160 are connected by signal paths 162, 164, 166, and 168.

  The transmitter 140 and the receiver 152 are connected by a video signal line 172 to transmit and receive a video signal. The connection detection unit 142 and the connection response unit 160 are connected by connection detection lines 174 and 176. The video signal line 172 and the connection detection lines 174 and 176 constitute the connection cable 106 (FIG. 5). Further, the GPU 136 and the CPU 138 constitute a control unit 178.

  The memory 132 is an example of a unit that stores information, and constitutes a storage unit of the computer 102. For example, the memory 132 is a ROM (Read Only Memory), a RAM (Random Access Memory), a magnetic medium, a magneto-optical medium, or the like. The memory 132 can also be configured by combining these memories or media. In the memory 132, a resolution and a refresh rate are registered and stored as display settings representing the video signal format.

  As shown in FIG. 8, the memory 132 includes a display setting storage area 182 and a program storage area 184.

  In the display setting storage area 182, the current refresh rate setting is stored as display setting information 186, and a resolution table 188 is set.

  In the resolution table 188, numbers from 0 to 10 and resolution information are stored as shown in FIG. Note that the numbers from 0 to 10 represent the priority order of resolution used when adjusting the resolution of the video signal. This priority order is stored as the value of the variable X. Number 0 represents the highest priority. Hereinafter, the priority decreases as the number increases. The current setting is stored in correspondence with the number 0, and the first setting is stored in the number 1. The second setting, the third setting, the fourth setting,..., The tenth setting are stored in the number 2, the number 3, the number 4,. In FIG. 9, the XGA resolution (1024 × 768) is set as the first setting. In the first setting, the second setting, the third setting,..., The tenth setting, a resolution conforming to the VESA standard may be stored, or a unique resolution different from the VESA standard may be set. Good. The current settings (resolution and refresh rate) are data stored as initial settings at the time of computer manufacture when the computer 102 is not used. In the computer 102 used, the setting stored in the memory 132 when the display of the video on the display device is successful, that is, the setting in which the display was successful in the previous adjustment of the video signal.

  The priority order is determined based on the resolution size, for example. If the priority order of the resolution with the larger size is set higher, and the resolution with the smaller size is set as the priority order becomes lower, the success or failure of the video display can be confirmed in order from the one with the larger resolution. When the priority order is set in this way, a high-resolution video can be displayed when the display device 104 supports a plurality of resolutions.

  Further, for example, the priority order may be set in the descending order of the ratio adopted by the display device by increasing the priority order of the resolution adopted by many display devices. That is, priorities are set in order from a general and widely used resolution. With this setting, there is a high possibility that display on the display device 104 will be successful with a high priority setting.

  As shown in FIG. 8, the program storage area 184 stores various programs such as an OS (Operating System) 190, a control program 192 for determining whether display is possible, and adjusting display settings. These programs are executed by the CPU 138 and exhibit various functions.

  The VRAM 134 is an example of a unit that stores video data, and is an example of a video data storage unit. The VRAM 134 is configured by, for example, a DRAM (Dynamic Random Access Memory). Further, it may be constituted by a memory chip or the like mounted for displaying graphics. The VRAM 134 stores video material used for rendering as video data. The storage performed by the VRAM 134 is, for example, temporary storage (buffering).

  The GPU 136 is an example of a video processing unit, and configures the display signal generation unit 202 (FIG. 10). The GPU 136 accesses the VRAM 134, reads the video data stored in the VRAM 134, and renders the video data. The video data generated by the rendering is output to the transmitter 140 and is output from the transmitter 140 to the display device 104 as a video signal. Note that rendering is an image processing operation for generating final video data, for example.

  The CPU 138 is an example of calculation means for calculating and executing the OS 190 and the control program 192 stored in the memory 132, and is an example of an information processing unit. The CPU 138 executes the OS 190 and the control program 192 stored in the memory 132. As illustrated in FIG. 10, the CPU 138 includes, for example, a video display determination unit 204, a display setting selection unit 206, and a display setting information setting unit 208.

  The video display determination unit 204 determines whether or not the output video signal 108 can be displayed on the display device 104.

  When the video display determination unit 204 determines that the video signal 108 cannot be displayed, the display setting selection unit 206 selects the resolution or refresh rate of the video signal 108 and performs these changes. The display signal generator 202 adjusts the video signal 108 based on the changed resolution or refresh rate.

  When the video display determination unit 204 determines that the video signal 108 can be displayed, the display setting information setting unit 208 stores the resolution and refresh rate at which display is possible in the memory 132 and sets the display setting information as display setting information. To do.

  The transmitter 140 is an example of a means for transmitting a video signal, and is an example of a video transmission unit. The transmitter 140 is composed of an output port, for example. The transmitter 140 outputs the video signal received from the GPU 136 to the display device 104. The output video signal is received by the receiver 152 of the display device 104.

  The connection detection unit 142 is an example of a unit that detects the connection state of the device.

The voltage V _H is, for example, a power supply of 5 [V] with respect to the ground 220.

  The signal line 214 has a structure in which lines extending from three ends are coupled. The connection port 222, the resistor 216, and the buffer 218 of the connection detection line 176 are connected to each end, and the connection port 222, the resistor 216, and the buffer 218 are electrically connected. The other end of the resistor 216 is connected to the ground 220.

  The buffer 218 is an example of a unit that shapes the signal waveform. The buffer 218 receives the HPD signal 110 from the signal line 214 and shapes the signal. Then, the signal is supplied to the GPU 136 and the command receiving microcomputer 144 via the signal path 150. As a result, the GPU 136 can determine the connection status of the display device 104 and the command receiving microcomputer 144 can read the command superimposed on the HPD signal 110.

  The command receiving microcomputer 144 is an example of a means for reading a command from the HPD signal 110 and an example of a state information receiving unit. The command receiving microcomputer 144 is configured by, for example, a microcomputer. The command receiving microcomputer 144 receives the HPD signal 110 from the buffer 218 and reads a command superimposed on the HPD signal 110. The processed command is supplied to the CPU 138 via the signal path 146. In this case, for example, connection is made using GPIO (General Purpose Input / Output). Note that GPIO is an example of an interface. The command receiving microcomputer 144 and the CPU 138 can be easily connected via the GPIO.

  Next, the display device 104 will be described.

  The receiver 152 is an example of a unit that receives a video signal, and is an example of a video receiving unit. The receiver 152 is, for example, an input port. The receiver 152 receives the video signal transmitted from the transmitter 140 and outputs it to the scaler 154.

  The scaler 154 is an example of a unit that converts a video signal, and is an example of a state information generation unit. As shown in FIG. 11, the scaler 154 includes a video conversion unit 232 that performs video conversion, a resolution determination unit 234 that determines resolution, and a synchronization signal determination unit 236 that determines synchronization signals. These functions are performed by executing a control program by the scaler 154.

  The video conversion unit 232 converts the resolution for the computer into the resolution for the TV receiver. At that time, if there is a difference in screen size between the resolution for the computer and the resolution for the TV receiver, a certain amount of size adjustment is performed.

  The resolution determination unit 234 determines the resolution of the video signal 108, and the synchronization signal determination unit 236 determines the synchronization signal of the video signal 108. Based on the determination of the resolution determination unit 234 and the synchronization signal determination unit 236, it is determined whether or not the video of the received video signal 108 is successfully displayed. This determination is performed, for example, by the following method. For example, a refresh rate can be used to determine the vertical synchronization signal. The display state is determined by the resolution determination unit 234 and the synchronization signal determination unit 236 to constitute a state determination unit.

  (1) A method of determining whether display is possible by calculating a synchronization signal (horizontal synchronization signal and vertical synchronization signal) within a DE (Data Enable) signal period and a resolution for counting and displaying a pixel clock.

  (2) A method for determining whether or not the display mode is possible from the combination of the pixel clock frequency and the horizontal synchronizing signal frequency. For example, an image signal having a pixel clock frequency of 65 [MHz] and a horizontal synchronization signal frequency of 48.4 [kHz], a resolution of XGA (1024 × 768) and a refresh rate (vertical synchronization frequency) of 60 [Hz]. It is determined whether display is possible as a video display.

  If it can be displayed as a result of the determination, it is determined that the display is successful. If the resolution of the video signal is too large to be displayed, it is determined that the resolution cannot be displayed. If the video signal cannot be displayed because the refresh rate is too high or too low, it is determined that the synchronization signal is out of specification. If the cause cannot be identified, it is determined that the cause is an unknown error. This determination result is output to the command transmission microcomputer 158 as state information indicating the display state.

  When converting the video signal 108, the scaler 154 performs a certain size adjustment so that the resolution of the video signal 108 sent from the computer 102 fits on the screen of the display unit 156. With this size adjustment function, the possibility of successful display can be increased, video signal adjustment due to display failure can be suppressed to some extent, and the processing load on the computer 102 side can be reduced.

  The display unit 156 is an example of a unit that displays an image, and is an example of a display unit. The display unit 156 displays the video signal 108 converted by the scaler 154 as a video. The display unit 156 is, for example, an LCD (Liquid crystal display), a CRT (Cathode Ray Tube), a plasma display, an organic EL display (Organic Electroluminescence Display), or the like.

The command transmission microcomputer 158 is an example of means for adding a command to the HPD signal 110. The command transmission microcomputer 158 is constituted by, for example, a microcomputer. The command transmission microcomputer 158 receives status information that determines whether or not display is possible from the scaler 154, and operates the switch 248 based on this status information. When the switch 248 switches the disconnection or connection between the voltage V _H and the signal line 244 on the response side, the status information is added to the HPD signal 110. The command transmitting microcomputer 158 and the switch 248 are examples of the notification circuit 8 (FIG. 1).

  When receiving a result of determining that display is possible from the scaler 154, the command transmission microcomputer 158 writes a display success command in the HPD signal 110 as shown in FIG. 12, for example. The command in this case is, for example, 1111111111111111b (FFFFh) as a 16-bit signal. FFFFh is a 16-bit command value expressed in hexadecimal.

  When receiving a determination result indicating that the resolution and synchronization signal that cannot be displayed from the scaler 154 are non-standard or a cause-unknown error, the command transmission microcomputer 158 writes a corresponding display failure command in the HPD signal 110. For example, as shown in FIG. 13, when the video signal has a resolution that cannot be displayed, the signal is 1010101000110011b (AA33h) as a 16-bit signal. When the synchronization signal is not specified, it is 1010101011001100b (AACCh) as a 16-bit signal. If the cause is an unknown error, 1010101010101010b (AAAAh) is used as a 16-bit signal. By making each display failure command different, the cause that cannot be displayed can be transmitted as an error code. AA33h, AACCh and AAAAh are values expressed in hexadecimal.

The connection response unit 160 is an example of a unit that responds to the connection state of the device. The resistor 242 is disposed between the signal line 244 on the response side and the signal line 250 on the reception side. Further, the voltage V _H is supplied from one end of the switch 248 from the power supply unit 170. The voltage V _H is connected to the response side signal line 244 via the switch 248. The voltage V _H is, for example, 5 [V] with respect to the ground 220, for example.

The switch 248 is an example of a unit that switches connection or disconnection, and is an example of a switching unit. The switch 248 receives a connection or disconnection instruction signal from the command transmission microcomputer 158. Then, the voltage V _H is supplied to the signal line 244 on the response side by switching between connection and disconnection. The switch 248 is constituted by, for example, a transistor or a logic circuit.

  Next, FIG. 14 is referred to for signal detection of HPD. FIG. 14 is a diagram illustrating an example of a circuit related to HPD detection. The detection shown in FIG. 14 is an example, and the present invention is not limited to such detection.

When the display device 104 is not connected to the computer 102, as shown in FIG. 14A, the connection port 222 becomes an open end, and the voltage of the signal line 214 is the ground potential, that is, 0 [V] (V _GND ). It becomes. In this case, the connection detection unit 142 detects that the display device 104 is not connected.

Display device 104 is connected to the computer 102, when the supply voltage V _H to the signal line 244 of the responder by OFF of the switch 248 is disconnected, as shown in FIG. 14 (B), the voltage of the computer 102 V _H And the ground 220 are connected via a resistor 216 and a resistor 242 to form a voltage dividing circuit. For example, when the resistance values of the resistor 216 and the resistor 242 are the same, a voltage (V _L ) of 2.5 [V] is output to the buffer 218. Since the voltage V _L is higher than the threshold voltage (V _th ) (FIGS. 12 and 13), the connection detection unit 142 detects that the display device 104 is connected.

When the display device 104 is connected to the computer 102 and the voltage V _H is supplied to the response-side signal line 244 by turning on the switch 248, the response-side signal line 244 is connected to the response-side signal line 244 as shown in FIG. For example, a voltage of 5 [V] is supplied. Therefore, a voltage (V _H ) (FIG. 12, FIG. 13) of 5 [V] is output to the buffer 218. Since the voltage V _H is higher than the threshold voltage (V _th ), the connection detection unit 142 detects that the display device 104 is connected.

When the switch 248 is turned ON or OFF according to the instruction signal from the command transmission microcomputer 158, the voltage to the buffer 218 is switched between V _H and V _L. Therefore, the command shown in FIG. 12 or 13 is obtained. By using this voltage switching as a display success command, display failure command, and error cause command, the computer 102 can determine whether video display is possible. In addition, since the voltages V _H and V _L are higher than the threshold voltage (V _th ), the display device 104 can be normally detected even if a signal indicating success or failure of display is superimposed on the HPD signal 110. it can.

  Next, the control process will be described with reference to FIGS. 15 and 16. FIG. 15 is a flowchart showing an example of computer-side control processing, and FIG. 16 is a flowchart showing an example of resolution and refresh rate selection processing. Note that the processing illustrated in FIGS. 15 and 16 is an example, and the present invention is not limited to such processing.

  This control process is a process related to display control of the video display system 107 including the computer 102 and the display device 104.

  When the computer 102 is activated, the computer 102 reads display settings (step S101). At this time, the refresh rate stored in the memory 132 is read. The refresh rate read at this time is an initial value set at the time of manufacture when the computer 102 is used for the first time, and is the value set by the CPU 138 last time in the case of the computer 102 having a history of use.

The connection detection unit 142 receives the HPD signal 110 indicating the connection state of the display device 104 (step S102). It is determined whether the HPD signal 110 has a voltage equal to or higher than the threshold value (V _th ) (step S103). If the HPD signal 110 is smaller than the threshold value (NO in step S103), it is determined that the display device 104 is not connected and the display is performed. The operation is stopped (step S104). In the computer 102, when the display operation on the display device 104 has not yet started, and when the display operation is in a stopped state, the stopped state is maintained in step S104. The process of stopping the display operation from the reception of the HPD signal (steps S102 to S104) is repeated until it is determined that the display device 104 is connected.

  If the HPD signal 110 is greater than or equal to the threshold (YES in step S103), display resolution and refresh rate selection processing is performed (step S105). Note that the resolution is selected in the first selection after the power is turned on. The resolution is selected and determined from the resolution table 188 (FIG. 9) stored in the memory 132.

  When the display resolution or refresh rate is selected, a video signal is generated (step S106). The video signal is generated based on the resolution or refresh rate selected in step S105 from the video data stored in the VRAM 134.

  When the generated video signal is sent to the display device 104 (step S107), the video display result for the transmitted video signal is received as a command on the HPD signal (step S108). When the content of the HPD command is determined (step S109) and the display is successful and it is determined that the video signal can be displayed (Success in step S109), the resolution or refresh rate of the video signal is displayed as display setting information that can be displayed. Set. This display setting information is stored in the memory 132 as an output setting candidate for the next video adjustment (step S110).

  If it is determined that the display has failed and the video signal cannot be displayed (Failed in step S109), the process returns to the selection of the display resolution and refresh rate (step S105). Whether to select the display resolution or the refresh rate is determined by the received error code. From the selection of the display resolution and the refresh rate, the HPD command determination process (steps S105 to S109) is repeated until the display is successful. Even if the video signal transmitted from the computer 102 cannot be displayed on the display device 104 side by such control processing, the video signal is adjusted by automatically selecting a different resolution or selecting a different refresh rate. The output to the display device 104 is repeated. Then, the display on the display device 104 can be automatically made successful.

  Next, FIG. 16 will be referred to for selection of resolution and refresh rate. This process is performed as step S105 (FIG. 15).

  If the HPD signal 110 is greater than or equal to the threshold value (YES in step S103 in FIG. 15), it is determined whether or not this is the first process after the computer 102 is started (step S121). If this selection process is the first time (YES in step S121), the current setting assigned to X = 0 is selected from the resolution table 188 (step S122). Then, X = 0 is stored as the value of X (step S123), and the process proceeds to step S106 (FIG. 15).

  If the selection process is not the first time (NO in step S121), an error code is acquired from the display failure command (step S124), and this error code is determined (step S125). If it is a cause unknown error (the cause is unknown in step S125), 1 is added to the value of the stored variable X (step S126), and the resolution assigned to the new X value (the resolution of the Xth setting) (FIG. 9) is selected (step S127). The value of X is stored (step S123). With this processing, when a cause unknown error is received, the resolution can be selected in order from the highest priority, and the success or failure of the display can be confirmed.

  As a result of determining the error code, if the video signal 108 has a resolution that cannot be displayed (resolution not displayable in step S125), the value of the variable X is set to 1 (step S128). Then, the resolution of the video signal being output (current resolution) is compared with the resolution of the Xth setting assigned to the variable X (X resolution), and the X resolution is smaller than the current resolution (current resolution> X resolution). Is determined (step S129). If the X resolution is smaller than the current resolution (YES in step S129), the X-th setting resolution is selected (step S130), and the X value is stored (step S123). If the X resolution is greater than or equal to the current resolution (NO in step S129), 1 is added to the value of the variable X (step S131), and the X resolution of the setting assigned to the new X value is set. Compare with the current resolution. With this processing, it is possible to select only the resolution having a smaller size than the current resolution from the high priority resolutions, and to set the resolution. Therefore, it is possible to reduce the resolution of the video signal 108 and eliminate the cause of the error. .

  As a result of determining the error code, if the synchronization signal is out of the standard (in step S125, out of the synchronization signal standard), it is determined whether the refresh rate of the video signal being output is less than 60 [Hz] (step S132). If this frequency is less than 60 [Hz] (YES in step S132), it is determined that the display cannot be performed because the refresh rate is too low, the refresh rate is set to 60 [Hz] (step S133), and the process proceeds to step S106 (FIG. 15). Transition. If the frequency is 60 [Hz] or higher (NO in step S132), it is determined that display is impossible because the frequency is too high, the refresh rate is reduced by 1 [Hz] (step S134), and the process proceeds to step S106 (FIG. 15). Transition. In this way, for an error that the synchronization signal is out of specification, the resolution setting can be maintained and the refresh rate can be adjusted and set again.

  Next, the processing of the display device will be described with reference to FIG. FIG. 17 is a flowchart illustrating an example of processing on the display device side. Note that the processing shown in FIG. 17 is an example, and the present invention is not limited to such processing.

  When the display device 104 is connected to the power source and connected to the computer 102, the HPD signal 110 changes from Low to High (step S201). When the video signal 108 output from the computer 102 is received in this state (step S202), it is determined whether or not the video of the received video signal 108 can be displayed on the display unit 156 (step S203).

  As a result of determining whether or not display is possible on the display unit 156, if the output video signal cannot be displayed (NO in step S203), the cause of the inability to display is identified (step S204). For example, resolution determination and synchronization signal determination are performed, and a resolution and synchronization signal that cannot be displayed are determined to be out of standard or cause-unknown errors. Then, an error code corresponding to each is generated, and this error code is transmitted to the computer 102 as a display failure command (FIG. 13) (step S205). Further, the display on the display unit 156 is stopped (step S206).

  As a result of determining whether or not display is possible on the display unit 156, in the case of a displayable video signal (YES in step S203), a display success command (FIG. 12) indicating the display success is superimposed on the HPD signal 110 and displayed on the computer 102. Transmit (step S207). Then, the video based on the video signal is displayed on the display unit 156 (step S208).

  Since the reception of the video signal (step S202) to the stop of the display (step S206) is automatically repeated until display is possible, even when a video signal that cannot be displayed on the display unit 156 is output, Can be adjusted to a displayable state.

  Next, FIG. 18 is referred to regarding the video signal changing process. FIG. 18 is a sequence diagram illustrating an example of video signal change processing. Note that the processing shown in FIG. 18 is an example, and the present invention is not limited to such processing. The sequence shown in FIG. 18 is a case where the video display fails in the first video signal transmission and the video display succeeds in the next video signal transmission.

  When the video signal 108 is transmitted from the computer 102 to the display device 104 (step S301), the display device 104 determines the resolution from the video signal 108 (step S302). As a result of the determination, if the resolution cannot be displayed, an error code having a resolution that cannot be displayed is transmitted to the computer 102 (step S303). Also, a synchronization signal is determined from the video signal (step S304), and if the result of determination is that the synchronization signal is not specified, an error code whose synchronization signal is not specified is transmitted to the computer 102 (step S305). If it is determined that the cause is unknown but display is impossible (step S306), an unknown error code is transmitted to the computer 102 (step S307).

  Upon receiving these errors, the computer 102 selects a video signal (next video signal) to be transmitted next (step S308). When a resolution error is received, a process for changing the resolution is performed (steps S128 to S131 in FIG. 16), and when an unknown error is received, a process for changing the resolution is performed (steps S126 to S127 in FIG. 16). When the synchronization signal error is received, the refresh rate is changed (steps S132 to S134 in FIG. 16). When both the resolution error and the synchronization signal error are received, both the resolution and the refresh rate are changed. The computer 102 transmits the next video signal to the display device 104 (step S309).

  When there is no error in the transmitted video signal and the video display of the video signal is successful, the display device 104 notifies the computer 102 of the display success (step S310). Receiving the notification of successful display, the computer 102 stores the resolution that has been successfully displayed (step S311). If there is an error and display is impossible, resolution determination (step S302), synchronization signal determination (step S304), and determination that the cause is unknown but display is impossible (step S306). Will be repeated.

  The user may set the video signal manually. Some OSs of the computer 102 have a function of hiding resolutions and the like that cannot be displayed on a connected monitor in order to prevent setting errors. However, this function can be disabled. In addition, the OS function may not be able to hide all the resolutions that cannot be displayed. In such a situation, when the user manually sets UXGA (1600 × 1200) and transmits the video signal 108 to the display device 104 whose maximum displayable resolution is XGA (1024 × 768), the display device 104 Cannot display video.

  In addition to such a case, the display device 104 cannot display an image in the following cases.

  (1) When the video signal has a unique resolution that does not conform to the VESA standard, such as a resolution of 1400 × 1050.

  (2) While the applicable refresh rate is 60 to 75 [MHz], the refresh rate of the video signal is too high, for example, 100 [MHz], or low, for example, 50 [MHz]. If too much. In addition, since the refresh rate standard is determined for each country, if it cannot be displayed, for example, the refresh rate of a Japanese TV receiver conforming to HDMI is 60 [Hz], whereas European TV The standard refresh rate of the receiver is 50 [Hz]. For this reason, when a signal for Europe is sent to a TV receiver for the Japanese market, display may not be possible.

  (3) When the definition of EDID (Extended Display Data Channel) on the display side, that is, the display setting information about itself is wrong, for example, the polarities of the horizontal synchronizing signal and the vertical synchronizing signal are reversed.

  When the display device 104 cannot display an image, for example, a message such as “Out of range” or “unspecified timing” is displayed on a screen with a black background.

  Therefore, it is possible to control the HPD signal 110 so that the computer 102 can grasp the display result, and by switching and retransmitting the video signal 108, the display device 104 can be automatically displayed. Display on 104 becomes easy. For example, even if the computer 102 transmits the UXGA video signal 108, the display device 104 controls the HPD signal 110 to transmit a command indicating a display failure and an error cause code to the computer 102. The computer 102 can grasp the display result. Since the computer 102 can monitor the HPD signal 110 and recognize an error command, the computer 102 selects another screen resolution as the next candidate from the resolution table 188 of the computer 102, switches the video signal 108, and retransmits it. It becomes possible to do. When the computer 102 transmits the XGA video signal 108 by re-transmission, the video can be correctly displayed on the display device 104.

  Features or advantages of the third embodiment described above are listed.

  (1) As described above, in the connection between the information processing device and the display device, the operation status signal of the display device is superimposed on the hot plug detect (HPD) signal that notifies the connection status of the connected display device. Send.

  (2) When the information processing device and the display device are connected, the operation state signal of the display device transmitted by superimposing the HPD signal for notifying the connection state of the connected display device is extracted, and if the display is not successful The setting data of the display device is changed and transmitted to the display device, and if it is a display success signal, the setting data of the display device at that time is stored and used thereafter.

  (3) A command for feeding back the display state on the display side to the information processing apparatus is added to the HPD signal 110 such as a DVI interface or an HDMI interface that connects the information processing apparatus and the display apparatus.

  (4) If display is impossible, an error command signal is sent from the display device to the information processing device via the HPD signal 110 line. The information processing apparatus that has received the error command resets the video signal that has been successfully displayed or a video signal that has a high possibility of being displayed, and retransmits it so that it can be displayed correctly. When a correct display signal is sent from the information processing apparatus and can be displayed correctly on the display apparatus, a command signal indicating successful display is transmitted to the information processing apparatus. The information processing apparatus side holds the setting.

  (5) Since the correct video signal is automatically output by the closed control between the information processing device and the display device, the labor of repair is not required.

  (6) If a TV receiver is used as the display device and the TV receiver and the information processing device are connected by a DVI cable or HDMI cable, the information processing device generates the information by automatically adjusting the resolution and refresh rate. Can be displayed on a TV receiver.

  (7) The display device raises or lowers the voltage of the HPD signal 110 within a voltage range higher than the threshold value, and adds a display success command, a display failure command, or an error code to the HPD signal 110. Since these commands or codes are superimposed on the HPD signal 110, it is not necessary to provide a new connection line when transmitting the commands or codes from the display device to the information processing device.

  (8) It can be used in a system in which a user connects an information processing apparatus such as a computer and a TV receiver and sets screen output.

[Fourth Embodiment]

  The fourth embodiment will be described with reference to FIG. FIG. 19 is a diagram illustrating an example of a video display system according to the fourth embodiment. Note that the configuration shown in FIG. 19 is an example, and the present invention is not limited to such a configuration.

  The video display system 302 according to the fourth embodiment includes a function of compressing video data or expanding video data as changing the resolution of the display signal. In this system, video data transmitted from the PC 304 is supplied to the projector 312 and the PCs 314, 316, and 318 via the screen data transmitter 306. And it displays on each display part of the projector 312 and PC314,316,318. At that time, the video data is compressed or the video data is expanded and displayed on each display unit. This compression and decompression of video data can be applied when automatically displaying video when the received video data cannot be displayed on the display device, and when the display on each display device is not optimal It is also possible to apply as an adjustment means.

  The PC 304 is an example of a unit that supplies video data, and is, for example, a video data supply unit. The PC 304 generates video data and transmits it to the screen data transmitter 306 via the connection cable 308. Note that the video data is an example of a display signal, and the video to be displayed on the display device is generated by processing the video data.

  The monitor 320 is an example of a means for displaying video, and constitutes a display device, for example. The monitor 320 includes a screen such as a liquid crystal panel, for example, and displays an image on this screen. By displaying the video of the video data transmitted to the screen data transmitter 306 on the monitor 320, the content of the transmitted video data can be confirmed.

  The keyboard 322 is an example of a unit that receives an input signal, and configures a data input unit, for example. By operating the keyboard 322, video data to be transmitted from the PC 304 to the screen data transmitter 306 is selected, and transmission timing is adjusted.

  The screen data transmitter 306 is an example of a unit that transmits video data to a plurality of display units, and is an example of an information processing device. The screen data transmitter 306 and the PC 304 constitute an information processing device. As shown in FIG. 19, the screen data transmitter 306 receives video data from the PC 304 and transmits it to the projector 312 and the PCs 314, 316, and 318. Transmission of video data to the projector 312 is performed via the connection cable 310, for example. Further, transmission to the PCs 314, 316, and 318 is performed via wireless means, for example. As such wireless means, in addition to short-range wireless communication such as infrared communication and Bluetooth, wireless communication via a base station can be employed. By using the wireless communication means, there is no trouble of wiring between the screen data transmitter 306, and it is easy even if the PCs 314, 316, 318 are arranged away from the screen data transmitter 306. Data can be transmitted or received.

  The projector 312 is an example of a unit that displays an image. The projector 312 receives the video data from the screen data transmitter 306, generates video light based on the video data, and projects the video light on the screen or the like from the light projecting unit 324 to display the video. The projector 312 functions as a display device by including the light projecting unit 324.

  The PCs 314, 316, and 318 are examples of a unit that processes video data and displays video, and is an example of a display device. The PCs 314, 316, and 318 include monitors 326, 330, and 334 and keyboards 328, 332, and 336, respectively.

  The monitors 326, 330, and 334 are an example of a unit that displays an image, and an example of a display unit. When the PC 314, 316, 318 receives the video data from the screen data transmitter 306, the video based on the received video data is displayed on the monitors 326, 330, 334.

  The keyboards 328, 332, and 336 are an example of a unit that receives an input signal, and configures a data input unit, for example.

  As shown in FIG. 19, the video data of the video “A” is transmitted from the PC 304 to the screen data transmitter 306. In this case, the video “A” is displayed on the monitors 320, 326, 330, and 334 of the PCs 304, 314, 316, and 318, and the video light of the video “A” is projected from the projector 324 of the projector 312. Is done. In this manner, video can be displayed on a plurality of display devices based on video data supplied from the PC 304.

  When video is displayed on a plurality of display devices, the display settings of the respective display devices may be different. For example, the monitor 330 is larger than the monitor 326 and can display an image having a higher resolution than the monitor 326. In some cases, the aspect ratio of the screens of the monitors 326 and 330 is a wide size with a screen aspect ratio of 16: 9 with respect to the normal size of 4: 3. Accordingly, the PCs 314, 316, and 318 adjust the received video data to video data suitable for each monitor and display it. The screen data transmitter 306 supplies video data that can be projected by the projector 312 to the projector 312. The aspect ratio of the screen represents the ratio between the horizontal length and the vertical length of the screen. The normal size 4: 3 indicates that the horizontal length is 4 with respect to the vertical length, and the wide size 16: 9 indicates that the horizontal length is 16 with respect to the horizontal length. Is 9.

  Next, the screen data transmitter will be described with reference to FIG. FIG. 20 is a diagram illustrating an example of the configuration of the screen data transmitter. Note that the configuration shown in FIG. 20 is an example, and the present invention is not limited to such a configuration. 20, the same parts as those in FIG. 19 are denoted by the same reference numerals. FIG. 20 shows an example of screen data transmission of the PC 304.

  The control circuit 352 is an example of a unit that processes video data. The control circuit 352 receives the video data of the PC 304 from the input interface (I / F) unit 354, outputs the received video data from the output interface (I / F) unit 356, and transmits the video data via the transmission unit 360. FIG. 20 shows an example in which the resolution of the video data of the PC 304 is 1280 × 1024.

  The control circuit 352 includes a CPU, for example, and executes the OS 372 and the control program 374 stored in the program storage area 366 of the memory 358, thereby outputting the video data from the output I / F unit 356 and via the transmission unit 360. The transmission of recorded video data. Such a control program is read from the memory 358 when the screen data transmitter 306 is activated. Then, it receives an instruction signal or the like input from the key input unit 362 and performs various controls.

  Further, the control circuit 352 analyzes the resolution from the video data, stores the resolution information 368 in the data storage area 364 of the memory 358, and mixes the mixed data 370 obtained by mixing the resolution information 368 and the video data into the data storage area 364. To remember. The control circuit 352 transmits the mixed data 370 stored in the memory 358 from the transmission unit 360. Note that the memory 358 is an example of a unit that stores data, and information, data, or programs are read or written between the control circuit 352 and the memory 358.

  The input I / F unit 354 is an example of a unit that takes in information and constitutes an input unit. The input I / F unit 354 accepts video data from the connected PC 304 (FIG. 19), for example. The input I / F unit 354 includes, for example, an analog RGB terminal, DVI, HDMI, a display port, or the like.

  The output I / F unit 356 is an example of a unit that outputs information, and constitutes an output unit. The output I / F unit 356 supplies video data to the projector 312 (FIG. 19). The output I / F unit 356 includes, for example, an analog RGB terminal, DVI, HDMI, a display port, or the like.

  When the resolution of the video data supplied from the PC 304 is not within the range that can be displayed by the projector 312, the resolution of the video data is adjusted by the control circuit 352. The resolution is adjusted by operating the key input unit 362, for example. In addition, it automatically adjusts using the video scaling function. By this adjustment, the video data output from the PC 304 can be displayed so as to be suitable for the projector 312. Also, as shown in FIG. 20, an SXGA (Super eXtended Graphics Array) image that can be displayed on the projector 312 may be output from the PC 304 and the SXGA image data may be output to the projector.

  The transmission unit 360 is an example of a unit that transmits video data. The transmission unit 360 receives the mixed data 370 from the control circuit 352 and outputs it to the PCs 314, 316, and 318 (FIG. 19). The transmission unit 360 is configured by transmission means suitable for infrared communication, Bluetooth, or wireless communication via a base station, for example.

  The key input unit 362 is an example of a unit that generates an instruction signal according to an operation. The key input unit 362 includes, for example, a numeric keypad, a keyboard, or a touch panel that displays keys on the display panel.

  An instruction signal is generated by operating the key input unit 362, and switching of output or transmission of video data is performed. For example, switching between the case where both the output from the output I / F unit 356 and the transmission from the transmission unit 360 are performed and the case where either the output from the output I / F unit 356 or the transmission from the transmission unit 360 is performed are switched. It is done. When displaying materials to be provided on the spot to participants who participate in the presentation, video data is provided to the participants by stopping transmission from the transmission unit 360 and displaying the video from the projector 312. Nothing will happen. Also, when the conference room is bright and it is difficult to see the video, or when the image resolution of the projector 312 is low and the details of the material are difficult to see, transmission from the transmission unit 360 is performed and video data is provided to a plurality of PCs. , Display the video. This facilitates the confirmation of the video.

  Next, with reference to FIGS. 21 and 22, the PC that displays the received video will be described. FIG. 21 is a diagram illustrating an example of a PC, and FIG. 22 is a diagram illustrating a configuration example of a memory of the PC. Note that the configurations shown in FIGS. 21 and 22 are examples, and the present invention is not limited to such configurations. The same parts as those in FIG. 19 are denoted by the same reference numerals. Although the configuration of the PC 314 is referred to, the PCs 316 and 318 can have the same configuration.

  The receiving unit 402, the CPU 404, the memory 406, the resolution storage unit 408, the monitor 326, and the keyboard 328 are connected to the bus line 410 to enable data communication between the elements.

  The receiving unit 402 is an example of a unit that receives video data. The mixed data 424 is received from the transmission unit 360 of the screen data transmitter 306. For wireless communication, a communication method of the same standard as that of the transmission unit 360 is adopted. As a result, data communication with the transmission unit 360 becomes possible. Regarding the mixed data, for the sake of convenience, data transmitted by the screen data transmitter 306 is represented as mixed data 370, and data received by the PC 314 is represented as mixed data 424.

  The CPU 404 is an example of a unit that processes information and an example of a control unit. The CPU 404 extracts video data 428 and resolution information 426 from the mixed data 424 received by the receiving unit 402. Also, the resolution of the monitor 326 (hereinafter referred to as “monitor resolution”) and the resolution information 426 are compared, and the video data 428 is compressed or expanded to a resolution size that can be displayed on the monitor. Such processing is performed automatically.

  The memory 406 is an example of a unit that stores data. The memory 406 is composed of, for example, RAM, ROM, or both. When a video memory such as VRAM or DRAM is used as the RAM, for example, video data can be read and written at high speed.

  As shown in FIG. 22, the memory 406 includes a data storage area 420 and a program storage area 422. In the data storage area 420, the mixed data 424 received from the screen data transmitter 306, the resolution information 426 and the video data 428 extracted from the mixed data 424, and the compression / decompression generated by compressing or expanding the video data 428 are displayed. The decompressed data 430 is stored. The compressed / expanded data 430 is composed of compressed data or expanded data.

  The program storage area 422 stores an OS 432 and a control program 434. By executing these programs by the CPU 404, the display of the mixed data 424 can be executed.

  The resolution storage unit 408 is an example of a unit that stores monitor resolution. The resolution storage unit 408 is constituted by a ROM, for example. The ROM is a non-volatile memory, and stored data is maintained even when the PC is turned off. In the case of using a RAM, the power is backed up using a battery or the like, and the setting is maintained even when the PC is turned off.

  Next, the processing of the screen data transmitter will be described with reference to FIG. FIG. 23 is a flowchart illustrating an example of processing of the screen data transmitter. Note that the flowchart shown in FIG. 23 is an example, and the present invention is not limited to such a flowchart.

  When the video data output from the PC 304 (FIG. 19) is captured by the input I / F unit 354 (step S401), the signal level of the video data is adjusted by the control circuit 352 and output from the output I / F unit 356 ( Step S402). The output video data is received by the projector 312 (FIG. 19) and projected by the projector 312.

  Further, the control circuit 352 analyzes the resolution from the video data captured by the input I / F unit 354 and stores the result in the memory 358 as resolution information 368 (step S403). Then, the video data and the resolution information 368 are mixed and stored as mixed data 370 in the memory 358 (step S404). Then, the mixed data 370 is transmitted from the transmission unit 360 (step S405).

  Next, with reference to FIG. 24 and FIG. FIG. 24 is a flowchart illustrating an example of processing of the PC, and FIG. 25 is a diagram illustrating an example of processing of received data. Note that the processing illustrated in FIGS. 24 and 25 is an example, and the present invention is not limited to such processing. In this case, for example, a case where the PC 314 receives data will be described.

  The mixed data 370 transmitted from the screen data transmitter 306 (FIG. 19) is received by the PC 314 (FIG. 19). In the PC 314, the reception unit 402 takes in the mixed data 370 and stores it as the mixed data 424 in the memory 406 (step S421). Then, as shown in FIG. 25, resolution information 426 and video data 428 are extracted from the mixed data 424 (F1) and stored in the memory 406 (step S422).

  Next, the monitor resolution stored in the resolution storage unit 408 is read (step S423), and compared with the resolution information 426, the video data 428 is compressed or expanded as shown in FIG. 25 (F2). The generated compressed data or decompressed data is stored in the memory 406 as compressed / decompressed data 430 (step S424). The PC 314 can grasp the compression rate or expansion rate suitable for displaying the video data 428 on the monitor 326 by comparing the monitor resolution with the resolution of the video data 428, and the video data can be obtained at this compression rate or expansion rate. Image data suitable for display on the monitor 326 can be generated by adjusting the screen size. As a result of comparison, if a suitable display can be performed without changing the screen size, the data as it is is stored as the compressed / expanded data 430.

  Next, the compressed / decompressed data 430 stored in the memory 406 is displayed on the monitor 326 (step S425).

  Features or advantages of the fourth embodiment described above are listed.

  (1) As described above, changing the resolution of the display signal calculates the compression rate or the expansion rate based on the resolution information of the video data and the monitor resolution, and compresses or expands the video data. It is possible to provide a display signal suitable for display on the screen.

  (2) In the fourth embodiment, whether the display is successful or unsuccessful is determined on the PC side that is the display signal receiving destination. Also in such an embodiment, the display signal can be automatically adjusted and displayed.

  (3) Video data can be provided to a plurality of PCs without going through a server, and a clear video can be displayed on the screens of the plurality of PCs. Even materials that cannot be provided as data to the other party can be displayed as clear video on the other party's PC screen without going through the server.

  (4) Such a system is used for, for example, a presentation performed in a conference. Presentation materials include materials that are provided on an ad hoc basis to those participating in the presentation. Such materials are displayed and displayed through a projector or the like, so that video data is not provided to participants. Also, if the conference room is bright and it is difficult to see the video, or if the image resolution of the projector etc. is low and the details of the material are difficult to see, the video data is provided to multiple PCs, and the video is adjusted by adjusting the resolution on the PC side. By displaying, it is possible to prevent the end of the video data from being cut off or the display from being reduced due to the difference in image resolution. In addition, since the resolution is adjusted on the receiving side of the video data, it is not necessary to change the video data according to the transmission destination, and the load on the transmission source is small.

  (5) The processing of the PC on the video data receiving side can be realized, for example, by executing application software. A general-purpose PC can be used, and the system can be easily introduced.

[Fifth Embodiment]

  26, 27, 28, 29, and 30 will be referred to for the fifth embodiment. FIG. 26 is a diagram illustrating an example of a video display system according to the fifth embodiment, FIG. 27 is a diagram illustrating an example of a setting value table, and FIG. 28 is a diagram illustrating an example of overscan. FIG. 29 is a diagram illustrating an example of an image when underscan is performed, and FIG. 30 is a diagram illustrating an example of a set value. The configurations shown in FIGS. 26, 27, 28, 29, and 30 are examples, and the present invention is not limited to such configurations. In FIG. 26, the same parts as those in FIG.

  The computer 502 and the display device 104 are connected by the connection cable 106. Further, the computer 502 and the server 504 are connected via a network 506. The video display system 510 is configured by connecting the computer 502, the display device 104, and the server 504. Since the connection between the computer 502 and the display device 104 is the same as the connection between the computer 102 and the display device 104 in the third embodiment, the description thereof is omitted.

  The server 504 is an example of means for storing and managing video signal display settings and providing them to the user. The server 504 includes a setting value DB (database) 508 to store and manage display settings.

  The setting value DB 508 is an example of means for managing files related to video, and constitutes a display setting database. The setting value DB 508 includes a setting value table 520. As shown in FIG. 27, the setting value table 520 stores a display device type name 522, a computer type name 524, unique information 526 for the combination of the computer 502 and the display device 104, and a recommendation 528. . The display device type name 522 is an example of identification information of the display device 104, the computer type name 524 is an example of identification information of the computer 502, and the recommendation 528 is a recommended setting value. It is recommended information that represents.

  The set value DB 508 can be accessed via the Web, and can be accessed from each computer. When the computer 502 determines that the video display has failed, the unique information 526 is read from the setting value DB 508 and the video signal 108 is adjusted. Since the unique information 526 is read from the database on the network, it is not necessary for each computer to store it. The unique information 526 is an example of display settings for the video signal 108, and includes resolution information 530 and underscan information 532. The resolution information 530 is information on the resolution that can be displayed by the display device of the corresponding model name. The underscan information 532 is information used when the video signal is slightly reduced in order to display the periphery of the video when the video of the corresponding resolution information 530 is displayed on the corresponding display device 104.

  When a computer video is displayed on a TV receiver compatible with DVI or HDMI standard connection, the TV receiver enlarges the computer video 540 (enlarged video 542) as shown in FIG. There is a case where processing (overscan processing) is performed to make 544 outside the screen end 546 of the TV receiver. Therefore, in order to display the end portion of the computer video 540, the video output of the computer is adjusted slightly smaller in consideration of this enlargement process. The underscan information is used for processing for reducing the video. The underscan value is set at a ratio of 100% when no enlargement or reduction is performed. This adjustment value may be determined in consideration of the characteristics of how much the TV receiver enlarges the video and the combination with the computer graphic system. As shown in FIG. 29, the video signal of the video (reduced video 548) reduced in advance using the underscan information is transmitted to the TV receiver, so that even if the TV receiver enlarges the video, Can be displayed. By setting the underscan information, it is possible to suppress the end portion of the computer image from being displayed.

  The recommendation 528 is information for identifying the most recommended setting and other settings when a plurality of pieces of data having the same combination of the display device and the computer are stored. Data in which “yes” is stored in the recommendation column represents the most recommended data, and data in which “no” is stored represents other data.

  The computer 502 reads the resolution information 530 and the underscan information 532 based on the display device type name 522, the computer type name 524, and the recommendation 528. For example, as shown in FIG. 30, 1920 × 1080 pixels (pixels) are read as resolution, and 95% is read as underscan. In this case, the model name 522 of the display device is acquired by using, for example, a device ID used in Plug and Play. The computer 502 changes the display setting using the acquired resolution information 530 and underscan information 532, and generates a video signal.

  Except for obtaining the resolution information 530 and the underscan information 532 from the setting value DB 508 and changing the display settings, the description is omitted.

  Next, the control processing of the computer will be described with reference to FIG. 31 and FIG. FIG. 31 is a diagram illustrating an example of software functions, and FIG. 32 is a flowchart illustrating an example of setting value change processing. Note that the configurations shown in FIGS. 31 and 32 are examples, and the present invention is not limited to such configurations.

  Setting value uploading or downloading to the setting value DB 508 and setting values to the computer 502 are performed by executing screen setting adjustment software 552 as shown in FIG. This screen setting adjustment software 552 is stored in the memory 132 (FIG. 7), for example. In executing the screen setting adjustment software 552, the CPU 138 (FIG. 7) of the computer 502 executes the screen setting adjustment software 552 and performs the following processing.

  When the computer 502 receives a display failure command, as shown in FIG. 32, the computer 502 accesses the setting value DB 508 and inquires of the setting value DB 508 whether there is a setting value corresponding to the combination of the computer 502 and the display device 104. (Step S501). If there is a setting value for the combination of the display device 104 and the computer 502 that has been inquired (YES in step S502), the resolution information 530 and the underscan information 532 are acquired as the setting values from the setting value DB 508, and these information are used. Then, the setting of the video signal is adjusted (step S503). Then, the setting adjustment is finished.

  If there is no set value (NO in step S502), the setting is adjusted on the computer 502 side (step S504). For this adjustment, for example, the display setting information described in the third embodiment can be used.

  When display on the display device 104 becomes possible, the combination of the computer 502 and the display device 104 and the corresponding setting value are registered in the setting value DB 508 (step S505). Thereby, when the same combination as the registered combination is performed, it is possible to read and set data from the setting value DB 508.

  By performing the computer control process in this way, it is possible to obtain an optimal setting value for the combination of the computer that executed the control and the display device, and to store the setting value in the database. In addition, a user who has a combination of a specific computer and a display device can automatically obtain an optimal setting value without being limited to the combination if the setting is performed by the second person or later. . The data of the setting value DB 508 is enriched, and combinations that are not set in the setting value DB 508 can be reduced.

  In this embodiment, resolution information 530 and underscan information 532 can be acquired using the types of display device 104 and computer 502 as keys. Also, the recommended value 528 of the setting value table 520 in the setting value DB 508 acquires a setting value of yes. The user adjusts the resolution information 530 and the underscan information 532 and updates the information recommendation 528 registered in the setting value DB 508 to “yes”, so that it can be identified whether the information is adjusted by the user. Can be used preferentially. In addition, since the setting value adjusted by the user is registered in the setting value DB 508, the work of listing the setting value candidates in the database is reduced for the manufacturer developing the device, and the load such as man-hours is reduced. As described above, since the setting is automatically adjusted and the setting value database is updated each time the user adjusts the setting, the burden on the user is small and the burden on the device manufacturer is small. Further, the selection of the display device and the selection of the computer by the user are not suppressed.

  With respect to the fifth embodiment described above, features, advantages, modifications, etc. will be described.

  (1) As described above, several setting value candidates are stored as a database and automatically adjusted. Therefore, it is necessary for the user to manually adjust the settings of a display device such as a computer or a TV receiver. Absent. There is no need to match the computer with the manufacturer or distributor of the display device, and selection can be made according to the user's preference.

[Other Embodiments]

  (1) For other embodiments, refer to FIG. 33 and FIG. FIG. 33 is a diagram illustrating an example of a command indicating a display failure, and FIG. 34 is a flowchart illustrating an example of processing on the display device side. The configurations shown in FIGS. 33 and 34 are examples, and the present invention is not limited to such configurations.

  In the above-described third embodiment, the display failure command including the error code (FIG. 13) is used. However, instead of this, the adjustment may be performed using a command representing only the display failure. In this case, the scaler 154 (FIG. 7) determines whether the display is successful or failed, and outputs state information to the command transmission microcomputer 158 (FIG. 7). The command transmission microcomputer 158 receives the status information from the scaler 154 and writes it in the HPD signal 110. The display result is written, for example, as a display success command (FIG. 12) or a display failure command (FIG. 33) and transmitted to the computer 102 together with the HPD signal 110.

  As shown in FIG. 33, the display failure command is, for example, 1010101010101010b (AAAAh) as a 16-bit signal. AAAAh is a value expressed in hexadecimal.

  The command receiving microcomputer 144 (FIG. 7) receives the HPD signal 110 from the buffer 218 of the connection detection unit 142 (FIG. 7), and displays a display success command (FIG. 12) or a display failure command (FIG. 12) superimposed on the HPD signal 110. 33) is processed. The processed command is notified to the CPU 138 (FIG. 7).

  When the command reception microcomputer 144 receives the display failure command, the CPU 138 adjusts the video signal. When receiving a display success command, the data is stored. Other configurations are the same as those of the third embodiment, and a description thereof will be omitted.

  Next, in the processing on the display device 104 side, steps S541 to S543 are the same as steps S201 to S203 (FIG. 17), and description thereof is omitted.

  As a result of determining whether or not display is possible on the display unit 156 (FIG. 7), when the output video signal cannot be displayed (NO in step S543), a display failure command (FIG. 7) is superimposed on the HPD signal 110 to indicate display failure. 33) is transmitted to the computer 102 (step S544), and the display of the display unit 156 is stopped (step S545).

  As a result of determining whether or not display is possible on the display unit 156, in the case of a displayable video signal (YES in step S543), a display success command (FIG. 12) indicating the display success is superimposed on the HPD signal 110 and displayed on the computer 102. Transmit (step S546). Then, the video based on the video signal is displayed on the display unit 156 (step S547).

  Since the reception of the video signal (step S542) to the stop of the display (step S545) are automatically repeated until display is possible, even when a video signal that cannot be displayed on the display unit 156 is output, Can be adjusted to a displayable state.

  Next, FIG. 35 will be referred to for selection of resolution or synchronization signal. FIG. 35 is a flowchart illustrating an example of resolution selection processing. Note that the processing shown in FIG. 35 is an example, and the present invention is not limited to such processing. This resolution or synchronization signal selection process is performed in step S105 of the computer control process shown in FIG.

  As the display resolution selection process, first, it is determined whether or not the selection process is the first process after the computer is started (step S561). If the selection process is the first time (YES in step 561), the current setting is selected (step S562).

  If the selection process is not the first time (NO in step S561), after adding 1 to the priority value (variable X) (step S563), it is determined whether or not the priority value (variable X) is 1. (Step S564). When the priority value is 1 (YES in step S564), the first setting of the setting table (for example, resolution table 188: FIG. 9) is selected (step S565).

  If the priority value is not 1 (NO in step S564), it is determined whether the priority value is 2 (step S566). If the priority value is 2 (YES in step S566), the second setting of the setting table (for example, resolution table 188: FIG. 9) is selected (step S567).

  If the priority value is neither 1 nor 2 (NO in step S566), it is determined whether the priority value is 3 (step S568). When the priority value is 3 (YES in step S568), the third setting of the setting table (for example, resolution table 188: FIG. 9) is selected (step S569).

  In this way, the computer determines the priority values in order from 1 and, if not from 1 to 9, for example, determines and selects the 10th setting (step S570). Therefore, it is possible to adjust the video signal in order from the highest priority resolution.

  In this embodiment, the video signal is adjusted by changing the resolution. When the display cannot be performed because the refresh rates are different, for example, when the display is not successful even if the resolution adjustment is performed up to the tenth setting, the refresh rate is changed and the determination is made again in order from the first setting of the resolution. This can be dealt with by doing so.

  (2) Reference is made to FIGS. 36, 37 and 38 for other embodiments. FIG. 36 is a diagram illustrating an example of a configuration of a screen data transmitter according to another embodiment, FIG. 37 is a diagram illustrating an example of a PC according to another embodiment, and FIG. 38 is a configuration of a memory of the PC. It is a figure which shows an example. The configurations shown in FIGS. 36, 37, and 38 are examples, and the present invention is not limited to such configurations. 36, FIG. 37 and FIG. 38, the same parts as those in FIG. 19, FIG. 20, FIG. 21 and FIG.

  In the above-described fourth embodiment, the case where video data is transmitted wirelessly has been described. However, video data may be encrypted and transmitted for the purpose of preventing data leakage. In this case, as shown in FIG. 36, the screen data transmitter 602 generates a password 604 by operating the key input unit 362 and stores the password 604 in the data storage area 608 of the memory 606. Then, the video data is encrypted based on the password 604 and mixed with the resolution information 368. The mixed data is stored in the data storage area 608 as mixed data 610. Other configurations are the same as those of the screen data transmitter 306 of the fourth embodiment, and a description thereof will be omitted.

  Further, the PC 632 generates a password 634 by operating the keyboard 328, and stores the password 634 in the data storage area 638 (FIG. 38) of the memory 636. The mixed data 610 received by the receiving unit 402 is stored as mixed data 640 in the data storage area 638. Other configurations are the same as those of the PC 314 (FIG. 21) of the fourth embodiment, and the description thereof is omitted.

  Next, the processing of the screen data transmitter will be described with reference to FIG. FIG. 39 is a flowchart illustrating an example of processing of the screen data transmitter. Note that the processing shown in FIG. 39 is an example, and the present invention is not limited to such processing.

  Steps S601 and S602 are the same as steps S401 and S402 (FIG. 23), and a description thereof is omitted.

  The resolution is analyzed from the video data captured by the input I / F unit 354, and the result is stored in the memory 606 as resolution information 368 (step S603).

  On the other hand, the password 604 is taken into the memory 606 by operating the key input unit 362 (step S604). Then, using the password 604 as a key, the video data is encrypted and converted into encrypted data, and the data (mixed data 610) mixed with the resolution information 368 is stored in the memory 606 (step S605). The mixed data 610 is transmitted from the transmission unit 360 (step S606).

  Next, PC processing will be described with reference to FIGS. 40 and 41. FIG. FIG. 40 is a flowchart illustrating an example of processing of the PC, and FIG. 41 is a diagram illustrating an example of processing of received data. Note that the processing illustrated in FIGS. 40 and 42 is an example, and the present invention is not limited to such processing.

  When the mixed data 610 is received from the screen data transmitter 306, the mixed data 610 is fetched and stored as the mixed data 640 in the memory 636 (step S621). On the other hand, with the keyboard 328, the input of the password 634 is accepted and taken into the memory 636 (step S622). The resolution information 426 and the video data 428 are extracted from the mixed data 640 (G1 in FIG. 41) and stored in the memory 636 (step S623). In such extraction, the encrypted data and the resolution information 426 are extracted separately from the mixed data 640 and stored in the memory 636. Then, using the password 634 inputted from the keyboard 328 as a key, the encrypted data is decrypted, and the decrypted video data 428 is stored in the memory 636.

  Next, the monitor resolution is read (step S624), and compared with the resolution information 426 extracted from the mixed data 640, the video data is compressed or decompressed (G2 in FIG. 41) and stored in the memory 636 (step S625). . The compressed data or the decompressed data stored in the memory 636 is displayed on the monitor 326 (step S626).

  About the above-mentioned embodiment, a feature matter, an advantage, a modification, etc. are enumerated.

  (1) In the above embodiment, video signal adjustment is performed automatically. In addition to the automatic adjustment function, a manual adjustment function may be provided so that automatic adjustment or manual adjustment of the video signal can be selected. By making automatic adjustment or manual adjustment selectable, for example, when connecting with a DVI cable, HDMI cable or display port, it is automatically adjusted, and when connecting with an RGB port, manual is selected and set. It may be.

  Manual setting can be performed as follows, for example. In the manual setting, an optimum setting can be performed depending on the user's operation.

  i) The user manually adjusts the settings of the computer and the TV receiver. This setting can be set, for example, by using Windows screen properties, or by using a utility provided by the graphic adapter vendor.

  ii) If the manufacturer of the computer and the TV receiver are the same, set values of the computer and TV receiver manufactured or sold by the manufacturer are prepared in advance and can be set using the set values.

  iii) A number of setting value candidates are listed and stored in the computer, and the user selects and sets from the stored setting values. Such setting is performed using, for example, a display area setting utility or a TV output utility preinstalled in the computer. If a list of several setting value candidates is listed and stored in the computer, for example, the setting burden on the user is reduced compared to using Windows screen properties.

  iv) Select and set the manual setting or the setting value listed. For example, as shown in FIG. 42, setting can be made from the set values listed using the left area 704 of the window 702 displayed on the screen, and manual setting can be selected using the right area 706. Like that. Note that the “easy setting” shown in FIG. 42 is an example of a method for setting the resolution and underscan from the listed setting values. FIG. 42 shows an example in which “underscan” is displayed as “size” in order to display using terms that are easily understood by the user.

  (2) In the above embodiment, a computer or a personal computer (PC) is shown as an example of the information processing apparatus, but the present invention is not limited to this. For example, as shown in FIG. 43, a video display system 808 may be configured by connecting a mobile phone 802 to a display device 804 with a connection cable 806 such as a USB (Universal Serial Bus). As shown in FIG. 44, a video display system 828 may be configured by connecting a recording / playback device 822 to a display device 824 with a connection cable 826. In addition, as shown in FIG. 45, a video display system 848 may be configured by connecting a game machine 842 to a display device 844 with a connection cable 846. The display signal output from the mobile phone 802, the recording / playback device 822, or the game machine 842 can be applied to video adjustment when the display devices 804, 824, and 844 cannot display the display signal. The recording / playback apparatus is a video tape recorder, a video disk recorder, a video disk player, or the like.

  (3) In the above embodiment, for example, the refresh rate may be fixed or manually set, and the resolution may be automatically adjusted. When an overseas display device is not used, it is unlikely that an image will not be displayed due to a difference in refresh rate, and by changing the display setting to be changed, it is possible to easily change the setting.

  (4) In the third embodiment and the fifth embodiment, the video resolution change is obtained by, for example, obtaining the resolution information of the display unit and comparing it with the resolution of the video to be output. The video signal may be generated by compressing or expanding the data. Note that the compression or decompression of video data can be performed, for example, by the configuration or method described in the fourth embodiment. Further, the resolution information of the display unit can be grasped by the computer by being superimposed on the HPD signal 110 and received, for example, in the same manner as a command or an error code.

  (5) In the third embodiment, the cause of the error is determined and the display failure command corresponding to each error is transmitted, but the present invention is not limited to this. For example, the error command shown in FIG. 13 may be transmitted together with the display failure command shown in FIG.

  (6) In the fourth embodiment, when the resolution of the video data supplied from the PC 304 is not within the range that can be displayed by the projector 312, the adjustment is made by the control circuit 352. You may adjust with.

  (7) In the fifth embodiment, the model name of the display device is acquired using plug and play, but the present invention is not limited to this. For example, when the display device outputs a display failure command to the computer, the display device type name command may be output. The computer 502 obtains the resolution information 530 and the underscan information 532 by searching the setting value DB 508 by acquiring the display device type name as a command together with the display failure command.

(Comparative example)

  Next, a comparative example will be described with reference to FIG. FIG. 46 is a diagram illustrating an example of a comparative example.

  The video display system 900 of the comparative example connects a computer 902 and a display device 904 with a connection cable 106.

  The computer 902 includes a memory 932, a VRAM 134, a GPU 136, a CPU 938, a transmitter 140, and a connection detection unit 142. The memory 932, the VRAM 134, the GPU 136, the CPU 938, the transmitter 140, and the connection detection unit 142 are connected by signal paths 146, 148, 149, and 150.

  The display device 904 includes a receiver 152, a scaler 954, a display unit 156, and a connection response unit 960. Receiver 152, scaler 954, and display unit 156 are connected by signal paths 162 and 164.

For example, when the display device 904 receives an HPD signal V _H of 5 [V], the voltage is reduced by the resistor 242 and transmitted to the computer 902 as it is. When converting the video signal, the scaler 954 adjusts the resolution of the video signal sent from the computer 902 to some extent so as to fit in the display unit 156, but if the display fails, the failure state is maintained. The Although the connection detection unit 142 detects the HPD signal received from the connection response unit 960, the display success or failure command is not received. Therefore, the CPU 938 cannot determine the success or failure of display, and maintains transmission of video signals that cannot be displayed. Therefore, when a video signal that cannot be displayed on the display device is sent from the computer due to an incorrect operation or replacement of the display device, a distorted image such as an image flowing diagonally and the screen blinking is displayed. become. Alternatively, the display device controls and stops the display, and an error message such as “Out of range” or “unspecified timing” is displayed on the black screen. In response to this situation, the computer user manually adjusts the display image.

  Next, the following additional notes will be disclosed with respect to the embodiment including the above-described examples. The present invention is not limited to the following supplementary notes.

(Appendix 1) A display device that displays a video in response to a display signal from an information processing device,
A display unit for displaying an image according to the display signal;
A state information generating unit that generates state information indicating a display state of the display unit;
A notification circuit for notifying the information processing device of the state information generated by the state information generation unit;
A display device comprising:

  (Supplementary note 2) The display device according to supplementary note 1, wherein the state information generation unit includes a state determination unit that determines a display state of the display unit.

  (Supplementary note 3) The display device according to Supplementary note 1 or Supplementary note 2, wherein the state information is notified by being superimposed on connection information representing a connection state with the information processing device.

  (Supplementary note 4) The display device according to supplementary note 3, wherein the connection information is a hot-plug detect signal.

(Supplementary Note 5) An information processing apparatus for sending a display signal to an externally connected display device,
A state information receiving unit for receiving state information indicating a display state from the display device;
A display signal generation unit that maintains the display signal currently being transmitted or generates a new display signal by receiving the state information received by the state information reception unit;
An information processing apparatus comprising:

  (Supplementary note 6) The information processing apparatus according to supplementary note 5, further comprising a storage unit that stores a display setting of the display signal currently being transmitted.

  (Supplementary note 7) The information processing apparatus according to supplementary note 5 or 6, wherein the state information receiving unit receives state information superimposed on connection information representing a connection state with the display device.

  (Supplementary note 8) The information processing apparatus according to supplementary note 7, wherein the connection information is a hot plug detect signal.

  (Additional remark 9) The said display signal production | generation part produces | generates the said new display signal based on the display setting different from the display setting of the said display signal currently being sent out. An information processing apparatus according to claim 1.

(Supplementary Note 10) A storage unit that stores the display setting of the display signal is provided.
The information processing apparatus according to appendix 5, wherein the new display signal is generated based on the display setting stored in the storage unit.

(Supplementary Note 11) A control method of a display device that displays a video in response to a display signal,
Receiving a display signal from the information processing apparatus and displaying an image of the display signal;
Generating state information representing a display state of the video;
Notifying the information processing apparatus of the state information;
A control method for a display device, comprising:

  (Additional remark 12) The said display state is discriminate | determined and the said state information is produced | generated, The control method of the display apparatus of Additional remark 11 characterized by the above-mentioned.

  (Additional remark 13) The control method of the display apparatus of Additional remark 11 or Additional remark 12 characterized by superimposing and notifying the said state information on the connection information showing the connection state with the said information processing apparatus.

  (Supplementary note 14) The display device control method according to supplementary note 13, wherein the connection information is a hot plug detect signal.

(Supplementary note 15) A method of controlling an information processing apparatus for sending a display signal, the step of sending a display signal to an externally connected display device;
Receiving status information representing a display status from the display device;
Maintaining the currently transmitted display signal or generating a new display signal by receiving the status information;
A method for controlling an information processing apparatus, comprising:

  (Supplementary note 16) The method for controlling an information processing apparatus according to supplementary note 15, including a step of storing a display setting of the display signal currently being transmitted.

  (Supplementary note 17) The control method for an information processing device according to supplementary note 15 or 16, wherein the state information superimposed on connection information representing a connection state with the display device is received.

  (Supplementary note 18) The information processing apparatus control method according to supplementary note 17, wherein the connection information is a hot plug detect signal.

  (Supplementary note 19) The information processing apparatus according to any one of supplementary notes 15 to 18, wherein the new display signal is generated based on a display setting different from a display setting of the currently transmitted display signal. Control method.

(Supplementary note 20) including the step of storing the display setting of the display signal,
16. The information processing apparatus control method according to appendix 15, wherein the new display signal is generated based on the stored display setting.

(Supplementary note 21) A display control program for displaying video on a computer of a display device,
A function of receiving a display signal from the information processing apparatus and displaying an image of the display signal;
A function of generating state information indicating a display state of the video;
A function of sending the state information to the information processing apparatus;
Display control program for realizing the above on a computer.

  (Supplementary note 22) The display control program according to supplementary note 21, wherein the display state is determined and the state information is generated.

(Supplementary Note 23) An information processing program for causing a computer of an information processing device to send a display signal,
A function of sending a display signal to an externally connected display device;
A function of maintaining a display signal currently being sent or generating a new display signal by receiving state information indicating a display state from the display device;
An information processing program for realizing a computer.

  (Additional remark 24) The information processing program of Additional remark 23 characterized by including the step which memorize | stores the display setting of the said display signal currently being sent out.

  (Supplementary note 25) The information processing program according to supplementary note 23 or supplementary note 24, wherein the state information superimposed on connection information representing a connection state with the display device is received.

  (Supplementary note 26) The information processing program according to supplementary note 25, wherein the connection information is a hot plug detect signal.

  (Supplementary note 27) The information processing program according to any one of supplementary notes 23 to 26, wherein the new display signal is generated based on a display setting different from a display setting of the currently transmitted display signal. .

(Supplementary note 28) A video display system for displaying a video of a display signal transmitted from an information processing device on a display device,
The display device
A display unit for displaying an image according to the display signal;
A state information generating unit that generates state information indicating a display state of the display unit;
A notification circuit for notifying the information processing device of the state information generated by the state information generation unit;
With
The information processing apparatus includes:
A state information receiving unit for receiving state information indicating a display state from the display device;
A display signal generation unit that maintains the display signal currently being transmitted or generates a new display signal by receiving the state information received by the state information reception unit;
A video display system comprising:

  (Supplementary note 29) The video display system according to supplementary note 28, wherein the state information is notified by being superimposed on connection information indicating a connection state between the information processing device and the display device.

  (Supplementary note 30) The video display system according to supplementary note 29, wherein the connection information is a hot plug detect signal.

As described above, the display device, the information processing device, the display device control method, the information processing device control method, the display control program, the information processing program, and the most preferable embodiments of the present disclosure have been described. The invention is not limited to the above description, and various modifications and changes can be made by those skilled in the art based on the gist of the invention described in the claims or disclosed in the embodiments for carrying out the invention. Of course, it goes without saying that such modifications and changes are included in the scope of the present invention.

2, 804, 824, 844 Display device 4 Status information generation unit 6, 156 Display unit 8 Notification circuit 52 Information processing device 54, 202 Display signal generation unit 56 Status information reception unit 102, 502 Computer 104 Display device 106 Connection cable 107 Video Display system 132, 358, 406, 606 Memory 134 VRAM
136 GPU
138, 404 CPU
140 Transmitter 142 Connection detection unit 144 Command reception microcomputer 152 Receiver 154 Scaler 158 Command transmission microcomputer 160 Connection response unit 178 Control unit 204 Video display determination unit 206 Display setting selection unit 208 Display setting information setting unit 232 Video conversion unit 234 Resolution determination Unit 236 Synchronization signal discriminating unit 302 Video display system 304, 314, 316, 318, 632 PC
306 Screen data transmitter 312 Projector 320, 326, 330, 334 Monitor 322, 328, 332, 336 Keyboard 324 Light emitting unit 352 Control circuit 354 Input I / F unit 356 Output I / F unit 360 Transmitting unit 362 Key input 402 Reception Section 408 Resolution storage section 504 Server 506 Network 508 Setting value DB
510 video display system 602 screen data transmitter 802 mobile phone 822 recording / playback device 842 game machine

Claims (6)

A display device that receives a display signal from an information processing device and displays an image,
A display unit for displaying an image according to the display signal;
A state information generating unit that generates state information indicating a display state of the display unit;
A notification circuit for notifying the information processing device of the state information generated by the state information generation unit;
A display device comprising:
An information processing device that sends a display signal to an externally connected display device,
A state information receiving unit for receiving state information indicating a display state from the display device;
A display signal generation unit that maintains the display signal currently being transmitted or generates a new display signal by receiving the state information received by the state information reception unit;
An information processing apparatus comprising:
A control method of a display device that displays a video in response to a display signal,
Receiving a display signal from the information processing apparatus and displaying an image of the display signal;
Generating state information representing a display state of the video;
Notifying the information processing apparatus of the state information;
A control method for a display device, comprising:
A method of controlling an information processing device for sending a display signal, the step of sending a display signal to an externally connected display device;
Receiving status information representing a display status from the display device;
Maintaining the currently transmitted display signal or generating a new display signal by receiving the status information;
A method for controlling an information processing apparatus, comprising:
A display control program for displaying video on a computer of a display device,
A function of receiving a display signal from the information processing apparatus and displaying an image of the display signal;
A function of generating state information indicating a display state of the video;
A function of sending the state information to the information processing apparatus;
Display control program for realizing the above on a computer.
An information processing program for causing a computer of an information processing device to send a display signal,
A function of sending a display signal to an externally connected display device;
A function of maintaining a display signal currently being sent or generating a new display signal by receiving state information indicating a display state from the display device;
An information processing program for realizing a computer.

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