JP2013130768A - Image supply device, control method of image supply device, program and storage medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image supply device, a control method of an image supply device, a program and a storage medium, capable of reducing load in displaying an image.SOLUTION: A control unit of a computer 1 detects an area in which a display content of an image (change area Am) is changed. The detected change area Am is expanded in a lateral direction (direction parallel to a scan line) up to both ends and the expanded area is set as an update area Ar. The control unit divides the update area Ar into a plurality of rectangular areas Ad so that image data of a transfer target fits within a predetermined data size. Specifically, the control unit divides the update area Ar so that the rectangular areas Ad align in a direction orthogonal to the scan line so as to form a belt-like area ranging from a leftmost edge to a rightmost edge of the update area Ar. The control unit transmits transfer data 52 including image data of one rectangular area Ad to a projector 2.

Description

  The present invention relates to an image supply device that supplies image data to an image display device, a control method for the image supply device, a program, and a recording medium.

  Regarding the connection between an image supply device that supplies image data and an image display device that receives the supply of image data and displays an image, instead of a dedicated interface (for example, analog RGB) for transferring image data, It is possible to connect using a general-purpose interface such as USB (Universal Serial Bus) (see, for example, Patent Document 1). When a general-purpose interface is used, the convenience of the user is improved because a connection cable is more easily available and the connection is easier than when a dedicated interface is used.

JP 2010-244058 A

  However, when transferring image data with a general-purpose interface, the transfer speed may be lower than when transferring with a dedicated interface. In such a case, the image displayed on the image display device is smooth. The problem arises that it cannot be changed. In Patent Document 1, the amount of data to be transferred is reduced by supplying only the region (difference) in which the image has changed among all the regions of the image. However, in order to further improve display quality, it is more efficient. Data transfer and data processing are required.

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

  Application Example 1 An image supply apparatus according to this application example is an image supply apparatus that transmits image data representing a display image to an image display apparatus, and detects a change area in which display content has changed in the display image. A detection unit, a region enlargement unit that enlarges the change region to both ends of the display image in a direction parallel to a scanning line of the display image, and sets the enlarged region as an update region; and an image of the update region And a communication unit that transmits data to the image display device.

  According to this image supply device, the change area whose display content has changed is enlarged to both ends in a direction parallel to the scanning line, and the image data of the enlarged area (update area) is transmitted. Image data having consecutive addresses is transmitted to the apparatus. For this reason, the process of specifying the position of the update region in the image display apparatus is facilitated, and the load when displaying an image on the image display apparatus can be reduced.

  Application Example 2 In the image supply apparatus according to the application example described above, the image supply apparatus further includes an area dividing unit that divides the update area into a plurality of areas arranged in a direction orthogonal to the scanning line, and the communication unit includes the area dividing unit. It is preferable that the image data is transmitted for each of the plurality of areas divided by the section.

  According to this image supply device, when the update area needs to be divided, it is divided into a plurality of areas arranged in a direction orthogonal to the scanning line, so that the address of the image data is continuous in each divided area. This facilitates the process of specifying the position of the area.

  Application Example 3 In the image supply device according to the application example, the first transfer process for transmitting the image data of the change area to the image display device, and the image data of the update area obtained by enlarging the change area. It is desirable to further include a selection unit that selects a second transfer process to be transmitted to the image display device based on the size of the change area.

  According to this image supply device, the first transfer process for transmitting the image data in the change area and the second transfer process for transmitting the image data in the update area are selected based on the size of the change area. Regardless of the size of the change area, the image data can always be transferred by an appropriate method.

  Application Example 4 In the image supply device according to the application example, it is preferable that the communication unit transmits the image data to the image display device by communication based on a USB mass storage class.

  Application Example 5 In the image supply device according to the application example, the image supply device further includes a control information generation unit that generates control information in which a command for the image display device is stored, and the communication unit displays the control information in the image display mode. And the transmission information including the image data of the update area is transmitted to the image display apparatus after the transmission of the control information, and the control information generation unit is configured to position the update area in the display image. It is preferable to store area information for indicating at least one of the size and the size in the control information.

  According to this image supply device, since the control information transmitted prior to transmission of the transfer data (image data of the update area) includes the area information for instructing the position and size of the update area, the transfer data It is no longer necessary to include area information in. As a result, in the image display device, it is possible to omit the step of storing the received transfer data in the buffer and analyzing the area information in the transfer data, so the load when displaying an image on the image display device is reduced. It becomes possible to reduce.

  Application Example 6 In the image supply apparatus according to the application example described above, the region information includes the position and length of the update region in a direction parallel to the scanning line, and the position and length in a direction orthogonal to the scanning line. Among them, it is desirable that only the position and length in the direction orthogonal to the scanning line are included.

  Application Example 7 In the image supply device according to the application example, the image supply apparatus further includes a data generation unit that adds audio data to the image data in the update area, and the communication unit receives the image data to which the audio data is added. It is desirable to transmit as the transfer data.

  According to this image supply device, since the data in which the audio data is added to the image data is transmitted as the transfer data, the number of times of data transfer can be reduced compared to the case where the image data and the audio data are transmitted separately. Thus, the efficiency of data transmission / reception and the processing associated therewith is improved.

  Application Example 8 In the image supply device according to the application example, it is preferable that the control information generation unit stores type information indicating a type of data included in the transfer data in the control information.

  According to this image supply device, it is possible to recognize the type of data included in the transfer data by referring to the control information. Therefore, in the image display device, when the received transfer data is processed, Efficiency is improved.

  Application Example 9 An image supply apparatus control method according to this application example is an image supply apparatus control method for transmitting image data representing a display image to an image display apparatus, and the display content of the display image changes. A detecting step for detecting the changed region, and a region expanding step for expanding the changed region to both ends of the display image in a direction parallel to a scanning line of the display image, and setting the expanded region as an update region; And a communication step of transmitting the image data of the update area to the image display device.

  According to the control method of the image supply apparatus, the change area whose display content has changed is enlarged to both ends in the direction parallel to the scanning line, and image data of the enlarged area (update area) is transmitted. The image data having consecutive addresses is transmitted to the image display device. For this reason, the process of specifying the position of the update region in the image display apparatus is facilitated, and the load when displaying an image on the image display apparatus can be reduced.

  Application Example 10 In the control method of the image supply apparatus according to the application example, the image supply apparatus further includes an area dividing step of dividing the update area into a plurality of areas arranged in a direction orthogonal to the scanning line. It is desirable to transmit the image data for each of the plurality of regions divided in the region dividing step.

  According to the control method of the image supply apparatus, when the update area needs to be divided, the update area is divided into a plurality of areas arranged in a direction orthogonal to the scanning line. Since the addresses are continuous, the process of specifying the position of the area becomes easy.

  Application Example 11 In the control method of the image supply apparatus according to the application example, a first transfer process for transmitting the image data of the change area to the image display apparatus, and the update area in which the change area is enlarged It is desirable to further include a selection step of selecting a second transfer process for transmitting image data to the image display device based on the size of the change area.

  According to the control method of the image supply device, the first transfer process for transmitting the image data in the change area and the second transfer process for transmitting the image data in the update area are performed based on the size of the change area. Therefore, the image data can always be transferred by an appropriate method regardless of the size of the change area.

  Application Example 12 In the control method of the image supply device according to the application example, it is preferable that in the communication step, the image data is transmitted to the image display device by communication based on a USB mass storage class.

  Application Example 13 In the method for controlling an image supply device according to the application example, prior to the control information generation step of generating control information storing a command for the image display device, and the communication step, the image display device A control information transmission step for transmitting the control information to the transmission step, wherein the communication step transmits transfer data including the image data of the update region, and the control information generation step includes the update region in the display image. It is desirable to store area information for indicating at least one of the position and the size in the control information.

  According to the control method of the image supply device, the control information transmitted prior to the transmission of the transfer data (update region image data) includes the region information for instructing the position and size of the update region. This eliminates the need to include area information in the transfer data. As a result, in the image display device, it is possible to omit the step of storing the received transfer data in the buffer and analyzing the area information in the transfer data, so the load when displaying an image on the image display device is reduced. It becomes possible to reduce.

  Application Example 14 In the method for controlling an image supply apparatus according to the application example, the region information includes a position and a length of the update region in a direction parallel to the scanning line and a position in a direction orthogonal to the scanning line. It is desirable that only the position and length in the direction orthogonal to the scanning line are included in the length and length.

  Application Example 15 In the control method of the image supply device according to the application example described above, the method further includes a data generation step of adding audio data to the image data in the update area, and the communication step adds the audio data It is desirable to transmit image data as the transfer data.

  According to the control method of the image supply apparatus, since the data with the audio data added to the image data is transmitted as the transfer data, the number of times of data transfer is reduced compared to the case where the image data and the audio data are transmitted separately. This makes it possible to reduce the data transmission / reception and the processing efficiency associated therewith.

  Application Example 16 In the method for controlling an image supply apparatus according to the application example, in the control information generation step, type information indicating a type of data included in the transfer data may be stored in the control information. desirable.

  According to the control method of the image supply device, it is possible to recognize the type of data included in the transfer data by referring to the control information. Therefore, the image display device processes the received transfer data. To improve efficiency.

  Application Example 17 A program according to this application example includes a detection step of detecting a change area in which display content has changed in the display image, to the computer that transmits image data representing the display image to the image display device, and the change An area enlarging step of enlarging the area to both ends of the display image in a direction parallel to the scanning line of the display image and setting the enlarged area as an update area; and image data of the update area as the image display device And a communication step to transmit to.

  According to this program, the change area whose display content has changed is enlarged to both ends in the direction parallel to the scanning line, and the image data of the enlarged area (update area) is transmitted. In this case, image data having continuous addresses is transmitted. For this reason, the process of specifying the position of the update region in the image display apparatus is facilitated, and the load when displaying an image on the image display apparatus can be reduced.

  Application Example 18 In the program according to the application example, the computer further executes an area dividing step of dividing the update area into a plurality of areas arranged in a direction orthogonal to the scanning line. In the communication step, It is desirable to transmit the image data for each of the plurality of areas divided in the area dividing step.

  According to this program, when the update area needs to be divided, it is divided into a plurality of areas arranged in a direction orthogonal to the scanning line, so that the address of the image data is continuous in each divided area. This facilitates the process of specifying the position of the area.

  Application Example 19 In the program according to the application example, the first transfer process for transmitting the image data of the change area to the image display device, and the image data of the update area obtained by enlarging the change area are the image. It is desirable that the computer further execute a selection step of selecting a second transfer process to be transmitted to the display device based on the size of the change area.

  According to this program, the first transfer process for transmitting the image data in the change area and the second transfer process for transmitting the image data in the update area are selected based on the size of the change area. Regardless of the size of the area, the image data can always be transferred by an appropriate method.

  Application Example 20 In the program according to the application example, it is preferable that in the communication step, the image data is transmitted to the image display device by communication based on a USB mass storage class.

  Application Example 21 In the program according to the application example described above, prior to the control information generation step for generating control information storing a command for the image display device and the communication step, the control information is supplied to the image display device. A control information transmission step of transmitting, further causing the computer to execute, in the communication step, transmitting transfer data including the image data of the update area, and in the control information generation step of the update area of the display image It is desirable to store area information for indicating at least one of position and size in the control information.

  According to this program, since the area information for indicating the position and size of the update area is included in the control information transmitted prior to the transmission of the transfer data (update area image data), the transfer data includes the area. No need to include information. As a result, in the image display device, it is possible to omit the step of storing the received transfer data in the buffer and analyzing the area information in the transfer data, so the load when displaying an image on the image display device is reduced. It becomes possible to reduce.

  Application Example 22 In the program according to the application example, the area information includes, among the position and length of the update area in a direction parallel to the scanning line, and the position and length in a direction orthogonal to the scanning line. It is desirable that only the position and length in the direction orthogonal to the scanning line are included.

  Application Example 23 In the program according to the application example, the computer further executes a data generation step of adding audio data to the image data in the update area, and the communication step adds the image to which the audio data is added. It is desirable to transmit data as the transfer data.

  According to this program, data with audio data added to image data is transmitted as transfer data, so the number of data transfers can be reduced compared to when image data and audio data are transmitted separately. Thus, the efficiency of data transmission / reception and the processing associated therewith is improved.

  Application Example 24 In the program according to the application example described above, in the control information generation step, it is preferable that type information indicating a type of data included in the transfer data is stored in the control information.

  According to this program, since it is possible to recognize the type of data included in the transfer data by referring to the control information, the efficiency of processing the received transfer data in the image display device is improved. improves.

  Application Example 25 A recording medium according to this application example includes a detection step of detecting a change area in which display content has changed in the display image to a computer that transmits image data representing the display image to an image display device; An area enlargement step of enlarging a change area to both ends of the display image in a direction parallel to a scanning line of the display image and setting the enlarged area as an update area, and displaying image data of the update area in the image display And a communication program to be transmitted to the apparatus.

  According to this recording medium, the change area whose display content has changed is enlarged to both ends in the direction parallel to the scanning line, and the image data of the enlarged area (update area) is transmitted. In this case, image data having consecutive addresses is transmitted. For this reason, the process of specifying the position of the update region in the image display apparatus is facilitated, and the load when displaying an image on the image display apparatus can be reduced.

  Application Example 26 In the recording medium according to the application example, the program further causes the computer to execute an area dividing step of dividing the update area into a plurality of areas arranged in a direction orthogonal to the scanning line, In the communication step, it is desirable to transmit the image data for each of the plurality of areas divided in the area dividing step.

  According to this recording medium, when the update area needs to be divided, the update area is divided into a plurality of areas arranged in a direction orthogonal to the scanning line, so that the addresses of the image data are continuous in each divided area. As a result, the process of specifying the position of the area becomes easy.

  Application Example 27 In the recording medium according to the application example, the program may include a first transfer process for transmitting the image data in the change area to the image display device, and an update area in which the change area is expanded. It is desirable that the computer further execute a selection step of selecting a second transfer process for transmitting image data to the image display device based on the size of the change area.

  According to this recording medium, in order to select the first transfer process for transmitting the image data in the change area and the second transfer process for transmitting the image data in the update area based on the size of the change area, Regardless of the size of the change area, the image data can always be transferred by an appropriate method.

  Application Example 28 In the recording medium according to the application example, it is preferable that in the communication step, the image data is transmitted to the image display device by communication based on a USB mass storage class.

  Application Example 29 In the recording medium according to the application example, the program includes a control information generation step for generating control information in which a command for the image display device is stored, and the image display device prior to the communication step. A control information transmission step for transmitting the control information to the computer, and in the communication step, transfer data including image data of the update area is transmitted, and in the control information generation step, the display image is transmitted. It is desirable to store area information for indicating at least one of the position and size of the update area in the control information.

  According to this recording medium, since the control information transmitted prior to the transmission of the transfer data (image data of the update area) includes the area information for indicating the position and size of the update area, the transfer data includes It is no longer necessary to include area information. As a result, in the image display device, it is possible to omit the step of storing the received transfer data in the buffer and analyzing the area information in the transfer data, so the load when displaying an image on the image display device is reduced. It becomes possible to reduce.

  Application Example 30 In the recording medium according to the application example, the area information includes the position and length of the update area in a direction parallel to the scanning line and the position and length in a direction orthogonal to the scanning line. Of these, it is desirable that only the position and length in the direction orthogonal to the scanning line are included.

  Application Example 31 In the recording medium according to the application example, the program further causes the computer to execute a data generation step of adding audio data to the image data in the update area. In the communication step, the audio data It is desirable to transmit the added image data as the transfer data.

  According to this recording medium, since data in which audio data is added to image data is transmitted as transfer data, the number of times of data transfer can be reduced compared to the case where image data and audio data are transmitted separately. Thus, the transmission / reception of data and the processing efficiency associated therewith are improved.

  Application Example 32 In the recording medium according to the application example described above, in the control information generation step, it is preferable that type information indicating a type of data included in the transfer data is stored in the control information.

  According to this recording medium, since it is possible to recognize the type of data included in the transfer data by referring to the control information, the efficiency in processing the received transfer data in the image display device Will improve.

  The above-mentioned recording medium includes various media that can be read by the computer, such as a flexible disk, a hard disk, an optical disk such as a CD or a DVD, a magneto-optical disk, a memory card equipped with a nonvolatile semiconductor memory, or a USB memory. Can be used.

The perspective view which shows an image display system. The block diagram which shows schematic structure of a computer. 1 is a block diagram showing a schematic configuration of a projector. The flowchart which shows operation | movement of the computer in execution of the data supply program. The figure which shows the display image currently displayed on the display apparatus. The flowchart for demonstrating a 1st transfer process. It is explanatory drawing for demonstrating a 1st transfer process, (a) is a figure which shows a display image, (b) is a figure which shows the data structure of the data transmitted / received. 6 is a flowchart for explaining the operation of the projector when image data or the like is transferred from a computer. It is explanatory drawing for demonstrating operation | movement of a projector, (a) is a figure which shows the data structure of the data transmitted / received, (b) is a memory map of a data buffer, (c) is a memory map of a frame buffer. (D) is a figure which shows the projection image projected from a projector. The flowchart for demonstrating a 2nd transfer process. It is explanatory drawing for demonstrating a 2nd transfer process, (a), (b) is a figure which shows a display image, (c) is a figure which shows the data structure of the data transmitted / received. 10 is a flowchart for explaining the operation of the projector when transfer data is supplied by a second transfer process. It is explanatory drawing for demonstrating operation | movement of a projector, (a) is a figure which shows the data structure of the data transmitted / received, (b) is a memory map of a data buffer, (c) is a memory map of a frame buffer. (D) is a figure which shows the projection image projected from a projector.

Hereinafter, the image display system of the present embodiment will be described with reference to the drawings.
FIG. 1 is a perspective view showing an image display system of the present embodiment.
As shown in FIG. 1, the image display system 100 includes a computer 1 as an image supply device and a projector 2 as an image display device. The computer 1 is, for example, a notebook personal computer, and is configured integrally with a display device 13, an input device 15, and the like. The projector 2 receives image data supplied from the computer 1 and projects an image corresponding to the image data onto a projection object such as a screen SC or a wall surface. Hereinafter, in the present embodiment, an example in which the projector 2 projects an image on the screen SC will be described. In this embodiment, the computer 1 and the projector 2 are connected by a USB (Universal Serial Bus) cable 3, and the computer 1 supplies image data and the like to the projector 2 by communication based on the USB mass storage class. .

FIG. 2 is a block diagram illustrating a schematic configuration of the computer 1.
As shown in FIG. 2, the computer 1 includes a control unit 11, a display control unit 12, a display device 13, a storage device 14, an input device 15, an audio output unit 16, a USB communication unit 17, and the like. The control unit 11, display control unit 12, storage device 14, input device 15, audio output unit 16, and USB communication unit 17 are connected to each other via a bus 18.

  The control unit 11 includes a CPU (Central Processing Unit) 11a and a RAM (Random Access Memory) 11b. The RAM 11b is configured by a DRAM (Dynamic RAM), and stores an OS (Operating System), application programs, various data, and the like read from the storage device 14 and the like. The control unit 11 controls the operation of the computer 1 by the CPU 11a operating according to various programs read into the RAM 11b.

  The display control unit 12 controls image display on the display device 13. The display control unit 12 includes a VRAM (Video RAM) 12a. Based on an instruction from the control unit 11, the display control unit 12 sequentially generates image data in units of frames (screens) on the VRAM 12a, and the generated image data is displayed on the display device 13. And an image based on the image data is displayed on the display device 13.

  The display device 13 is configured by a liquid crystal display, for example, and displays an image corresponding to the image data input from the display control unit 12.

  The storage device 14 is configured by, for example, a hard disk drive or the like, and stores an installed OS, application programs, various data, and the like. The OS of this embodiment includes a driver for controlling communication based on the USB mass storage class by the USB communication unit 17. The storage device 14 stores an application program (data supply program Sp) for supplying data such as image data from the computer 1 to the projector 2 using the driver.

  The input device 15 is configured by, for example, a keyboard or a pointing device, and notifies the control unit 11 of an operation signal based on an operation performed by the user.

  The audio output unit 16 includes a decoder, an amplifier, a speaker, and the like, and outputs audio based on audio data input from the control unit 11.

  The USB communication unit 17 is connected to an external peripheral device via a USB terminal (USB Type A terminal) (not shown), and performs data communication according to the USB standard with the peripheral device based on an instruction from the control unit 11. . As described above, the projector 2 is connected to the USB communication unit 17 of the present embodiment, and image data and the like are supplied from the USB communication unit 17 to the projector 2 by communication based on the USB mass storage class.

FIG. 3 is a block diagram illustrating a schematic configuration of the projector 2.
As shown in FIG. 3, the projector 2 includes a control unit 21, a storage unit 22, an input operation unit 23, a USB communication unit 24, a data buffer (queue) 25, a frame buffer 26, a frame memory 27, a DMA transfer unit 28, an image. The processing unit 29, the audio output unit 30, the image projection unit 40, and the like are connected to each other by a bus 31.

  The image projection unit 40 includes a light source 41, three liquid crystal light valves 42R, 42G, and 42B as light modulation devices, a projection lens 43 as a projection optical system, a liquid crystal drive unit 44, and the like. The image projection unit 40 corresponds to a display unit, modulates the light emitted from the light source 41 with the liquid crystal light valves 42R, 42G, and 42B, projects the light from the projection lens 43, and displays an image on the screen SC. To do.

  The light source 41 includes a discharge-type light source lamp 41a composed of an ultrahigh pressure mercury lamp, a metal halide lamp, or the like. Light emitted from the light source 41 is converted into light having a substantially uniform luminance distribution by an integrator optical system (not shown), and red (R), green (G), and blue, which are the three primary colors of light, by a color separation optical system (not shown). After being separated into each color light component of (B), it enters the liquid crystal light valves 42R, 42G and 42B, respectively.

  The liquid crystal light valves 42R, 42G, and 42B are each configured by a transmissive liquid crystal panel in which liquid crystal is sealed between a pair of transparent substrates. Each liquid crystal panel is formed with a plurality of pixels arranged in a matrix, and a driving voltage can be applied to the liquid crystal for each pixel.

  The liquid crystal drive unit 44 applies a drive voltage to each pixel of the liquid crystal light valves 42R, 42G, and 42B based on the image data stored in the frame memory 27, and sets each pixel to a light transmittance corresponding to the image data. Set to. As a result, the light emitted from the light source 41 is modulated for each RGB by passing through the liquid crystal light valves 42R, 42G, and 42B. Then, when the modulated light is synthesized by a color synthesis optical system (not shown) and projected from the projection lens 43 onto the screen SC, an image corresponding to the image data is displayed on the screen SC.

  The control unit 21 includes a CPU 21a, a RAM 21b used for temporary storage of various data, and the like. The control unit 21 controls the operation of the projector 2 by performing arithmetic processing while temporarily storing necessary information in the RAM 21b according to a control program stored in the storage unit 22.

  The storage unit 22 is configured by a ROM or the like including a nonvolatile memory, and stores a control program and the like. The storage unit 22 of this embodiment includes various drivers such as device drivers that control communication based on the USB mass storage class, and image data and audio data supplied from the computer 1 using these drivers. An application program (data reproduction program) for reproducing is stored.

  The input operation unit 23 includes a plurality of operation keys for the user to give various instructions to the projector 2. When the user operates various operation keys of the input operation unit 23, the input operation unit 23 outputs an operation signal corresponding to the operation content of the user to the control unit 21. In addition, it is good also as a structure using the remote control (not shown) in which the remote operation is possible as the input operation part 23. FIG. In this case, the remote controller transmits an infrared operation signal corresponding to the operation content of the user, and a receiving unit (not shown) receives the signal and transmits it to the control unit 21.

  The USB communication unit 24 is connected to an external host device (computer 1 in this embodiment) via a USB terminal (USB Type B terminal) (not shown), and is connected to the computer 1 based on an instruction from the control unit 21. Data communication (USB communication) conforming to the USB standard is performed. The USB communication unit 24 includes a FIFO (First In First Out) 24a as a buffer, and data received from the computer 1 is stored in the FIFO 24a.

  The data buffer 25 is a buffer that temporarily stores data received by the USB communication unit 24.

  The frame buffer 26 is a buffer for storing image data in units of frames among data received by the USB communication unit 24.

  The frame memory 27 is a memory that stores image data for one frame, and the liquid crystal drive unit 44 drives the liquid crystal light valves 42R, 42G, and 42B based on the image data stored in the frame memory 27. That is, the image projection unit 40 projects and displays an image based on the image data stored in the frame memory 27.

  Based on the control of the control unit 21, the DMA transfer unit 28 performs DMA (Direct Memory Access) transfer of data input to the FIFO 24 a of the USB communication unit 24 to the data buffer 25 or the frame buffer 26.

  The image processing unit 29 performs various types of image processing on the image data transmitted from the computer 1 and controls the transfer of the image data based on the control of the control unit 21.

  The audio output unit 30 includes a decoder, an amplifier, a speaker, and the like, and outputs audio based on audio data transmitted from the computer 1 based on the control of the control unit 21.

Next, the operation of the image display system 100 will be described.
When the computer 1 is powered on, the control unit 11 of the computer 1 activates the OS stored in the storage device 14 (reads into the RAM 11b) and starts an operation according to the OS. Then, the control unit 11 instructs the display control unit 12 to display a predetermined initial screen on the display device 13.

  When the activation of the OS is completed, the computer 1 waits for various user operations. Then, the user can operate the input device 15 to instruct activation of a desired application program.

  When the activation of the data supply program Sp is instructed in a state where the computer 1 and the projector 2 are connected via the USB cable 3, the control unit 11 of the computer 1 starts supplying image data to the projector 2. Specifically, the control unit 11 captures an image (display image) displayed on the display device 13 and transmits image data of the captured display image from the USB communication unit 17 to the projector 2. As a result, the image projection unit 40 of the projector 2 starts projecting a display image based on the image data transmitted from the computer 1. Thereafter, the control unit 11 of the computer 1 repeats capture and transmission of the display image. Here, the data supply program Sp of the present embodiment does not transmit the image data of the entire display image every time, but detects a change in display content with the passage of time, and includes a part where the change is detected. The amount of data to be transmitted is suppressed by transmitting the image data in the range of the copy.

  In the present embodiment, both the display image displayed by the display device 13 and the image projected by the projector 2 (projected image) have scanning lines along the horizontal direction (horizontal direction) in the vertical direction (vertical direction). A plurality are formed side by side. The display device 13 and the projector 2 sequentially draw one scanning line from the left end to the right end while sequentially selecting one scanning line from the upper end scanning line toward the lower end scanning line (that is, image data). Write). That is, in the display device 13 and the projector 2, when image data is written from the left end to the right end for a certain scanning line, the image data is next transferred from the left end to the right end for the scanning line immediately below the drawn scanning line. Written. Note that the relationship between the direction of the scanning line and the vertical and horizontal directions of the image is not limited to this.

  FIG. 4 is a flowchart illustrating the operation of the computer 1 executing the data supply program Sp, and FIG. 5 is a diagram illustrating a display image displayed on the display device 13.

  As shown in FIG. 4, in step S101, the control unit 11 of the computer 1 captures a display image Pd (see FIG. 5) for one screen displayed on the display device 13, and stores it in the RAM 11b. Various methods can be employed as the capture method. For example, the control unit 11 acquires image data from the VRAM 12 a of the display control unit 12.

  In step S102, the control unit 11 detects a region (change region Am) in which the display content of the image has changed by comparing the display image Pd captured this time with the display image Pd captured last time (see FIG. 5). Specifically, the control unit 11 divides the display image Pd into a plurality of small regions (not shown), compares two display images Pd that are temporally changed for each small region, and displays the display contents. Detect changes. Then, a minimum rectangular area including all the small areas in which the change is detected is determined as the change area Am.

  In step S103, the control unit 11 determines whether or not the height h (vertical length (number of pixels)) of the change area Am is higher than a predetermined threshold (first threshold). Then, when the height h of the change area Am is higher than the first threshold value, the process proceeds to step S106, and when it is equal to or less than the first threshold value, the process proceeds to step S104.

  When the process proceeds to step S104, the control unit 11 determines whether or not the horizontal width w (the horizontal length (number of pixels)) of the change area Am is wider than a predetermined threshold (second threshold). . Then, when the lateral width w of the change area Am is wider than the second threshold value, the process proceeds to step S106, and when it is equal to or smaller than the second threshold value, the process proceeds to step S105.

  When both the height h and the horizontal width w of the change area Am are equal to or smaller than the threshold value and the process proceeds to step S105, the control unit 11 supplies image data to the projector 2 by a first transfer process described later. On the other hand, when either the height h or the horizontal width w of the change area Am exceeds the threshold value and the process proceeds to step S106, the control unit 11 supplies image data to the projector 2 by a second transfer process described later. I do. That is, the control unit 11 selects the transfer process according to the height h and the horizontal width w of the change area Am, that is, the size of the change area Am.

First, the first transfer process will be described.
FIG. 6 is a flowchart for explaining the first transfer process, and shows the operation of the computer 1. FIGS. 7A and 7B are explanatory diagrams for explaining the first transfer process. FIG. 7A is a diagram showing a display image Pd, and FIG. 7B is a diagram showing a data structure of data to be transmitted and received. .

  As shown in FIG. 6, first, in step S121, the control unit 11 of the computer 1 divides the change area Am into a plurality of rectangular areas Ad (see FIG. 7A). Here, the image data included in each of the rectangular areas Ad is transferred in one transfer. Therefore, the control unit 11 divides the change area Am so that the size of the image data corresponding to the rectangular area Ad falls within a predetermined packet size (for example, 64 Kbytes) that can be transferred by one transfer. When the entire data size of the change area Am is equal to or smaller than the predetermined packet size, there is no need to divide, and the change area Am in this case is configured by only one rectangular area Ad.

  In step S122, the control unit 11 sets one rectangular area Ad among the divided rectangular areas Ad as a transmission target, and adds header information 52h to the head of the image data (FIG. 7B). )reference). The header information 52h includes type information indicating that the accompanying data (data body 52a) is image data, and area information for instructing the position and size of the rectangular area Ad to be transmitted on the display image Pd. It is out. As the area information, for example, the horizontal position (horizontal coordinate) and vertical position (vertical coordinate) of the upper left corner of the rectangular area Ad, and the horizontal width (horizontal length) and height of the rectangular area Ad ( Vertical length).

  In subsequent step S123, the control unit 11 transmits a CBW (Command Block Wrapper) 51 from the USB communication unit 17 to the projector 2 prior to transfer of the image data (see FIG. 7B). The CBW 51 is a packet used for the USB host (computer 1) to transmit a command to the device (projector 2), and information for notifying the device of the start of data transfer (transfer start notification information). ). The CBW 51 includes a command block (CBWCB) 51a as control information for controlling the device. The command block 51a stores a command to be executed by the device, and the command block 51a of the present embodiment includes an identification representing the selected transfer process (first transfer process or second transfer process). Information and the like are also stored.

  In step S124, following the transmission of the CBW 51, the control unit 11 transmits data obtained by adding the header information 52h to the image data (data body 52a) from the USB communication unit 17 to the projector 2 as the transfer data 52 (see FIG. 7 (b)).

  In step S125, the USB communication unit 17 receives a CSW (Command Status Wrapper) 53 transmitted from the projector 2 (see FIG. 7B). The CSW 53 is a packet for the USB device to send a status response indicating whether the command has been normally achieved to the host, and information (transfer) for notifying the host of the data transfer result. Function notification information).

  In step S126, the control unit 11 determines whether or not the transmission target rectangular area Ad is the last rectangular area Ad among the divided rectangular areas Ad. If it is not the last rectangular area Ad, the process returns to step S122, the rectangular area Ad to be transmitted is changed, the header data 52h is added to the image data of the next rectangular area Ad, the CBW 51 is transmitted, The transmission of the transfer data 52 and the reception of the CSW 53 are repeated. On the other hand, if it is the last rectangular area Ad, the process proceeds to step S127.

  When the transmission of the image data of all the rectangular areas Ad is completed and the process proceeds to step S127, the control unit 11 first transmits CBW 51 (step S127), and then a command for updating the display of the image (update) Command) is transmitted to the projector 2 as the transfer data 52 (step S128). In step S129, the USB communication unit 17 receives the CSW 53 from the projector 2.

  Although illustration is omitted, when the sound output unit 16 of the computer 1 outputs sound, the control unit 11 captures sound data and transmits it to the projector 2. Also in this case, the control unit 11 transmits the CBW 51 prior to the transmission of the audio data, and then transmits the data obtained by adding the header information 52h to the audio data (the data main body 52a) to the projector 2 as the transfer data 52. To do. Thereafter, the USB communication unit 17 receives the CSW 53 transmitted from the projector 2. The header information 52h added to the audio data includes type information indicating that the data body 52a is audio data, size information indicating the data size of the audio data, and the like.

  FIG. 8 is a flowchart for explaining the operation of the projector 2 when image data or the like is transferred from the computer 1. FIG. 9 is an explanatory diagram for explaining the operation of the projector 2. FIG. 9A is a diagram showing a data structure of data to be transmitted and received, FIG. 9B is a memory map of the data buffer 25, and FIG. () Is a memory map of the frame buffer 26, and (d) is a diagram showing a projected image projected from the projector 2.

  As shown in FIG. 8, in step S201, the USB communication unit 24 of the projector 2 receives the CBW 51 transmitted from the computer 1 and stores it in the FIFO 24a.

  In step S202, the control unit 21 of the projector 2 stores the CBW 51 in the structure in the driver, and in the subsequent step S203, the control unit 21 analyzes the command block 51a of the CBW 51. Then, based on the identification information stored in the command block 51a, the selected transfer process is identified.

  In step S204, the USB communication unit 24 receives the transfer data 52 (image data, audio data, or update command) transmitted from the computer 1 and stores it in the FIFO 24a.

  In step S205, the control unit 21 determines whether the selected transfer process is the first transfer process or the second transfer process based on the identification result in step S203. If the selected transfer process is the first transfer process, the process proceeds to step S206. On the other hand, the case where the selected transfer process is the second transfer process will be described later (see FIG. 12).

  When the selected transfer process is the first transfer process and the process proceeds to step S206, the control unit 21 instructs the DMA transfer unit 28 to transfer the transfer data 52 stored in the FIFO 24a to the data buffer. 25 (see FIGS. 9A and 9B). In step S207, the control unit 21 causes the USB communication unit 24 to transmit the CSW 53 indicating that the transfer data 52 has been normally received to the computer 1.

  In step S208, the control unit 21 analyzes the header information 52h and the like of the transfer data 52 transferred to the data buffer 25. In step S209, whether the type of the data body 52a of the transfer data 52 is image data or audio data. Or an update command. If the transfer data 52 is image data, the process proceeds to step S210. If the transfer data 52 is an update command, the process proceeds to step S211. If the transfer data 52 is sound data, the process proceeds to step S212.

  When the data body 52a is image data and the process proceeds to step S210, the control unit 21 instructs the image processing unit 29 to transfer the image data from the data buffer 25 to the frame buffer 26. Specifically, the control unit 21 derives the position (address) of the target rectangular area Ad on the frame buffer 26 based on the area information included in the header information 52h, and transfers the transferred image to this position. Data is stored (see FIG. 9C). In the frame buffer 26, the image data is stored in an arrangement according to the drawing order. For this reason, the areas in which the drawing order is continuous are stored at continuous addresses on the frame buffer 26. However, since the image data of each rectangular area Ad is not continuous, the frame buffer 26 intermittently.

  On the other hand, when the data body 52a is an update command and the process proceeds to step S211, the control unit 21 instructs the image processing unit 29 to frame one frame of image data stored in the frame buffer 26. The data is transferred to the memory 27. As a result, the display image Pd in which the change area Am is rewritten is projected as the projection image Pp from the image projection unit 40 of the projector 2 (see FIG. 9D) and displayed on the screen SC.

  If the data body 52a is audio data and the process proceeds to step S212, the control unit 21 transfers the audio data from the data buffer 25 to the audio output unit 30 to output audio.

  In this embodiment, the operation of the control unit 21 in steps S201 to S207 is an operation based on various drivers stored in the storage unit 22, and the operation of the control unit 21 in steps S208 to S212 is an application program ( This is an operation based on the data reproduction program.

Next, the second transfer process will be described.
FIG. 10 is a flowchart for explaining the second transfer process. FIG. 11 is an explanatory diagram for explaining the second transfer process. (A) and (b) are diagrams showing the display image Pd, and (c) is a data structure of data to be transmitted and received. FIG. When either the height h or the horizontal width w of the change area Am exceeds the threshold value and the image data is supplied by the second transfer process, the computer 1 operates according to the flow of FIG. In the second transfer process, an area obtained by enlarging the change area Am in the horizontal direction is set as a transfer target, and both the image data and the audio data are transferred by one transfer data 52.

  As shown in FIG. 10, in step S141, the control unit 11 of the computer 1 enlarges the detected change area Am to both ends in the horizontal direction (direction parallel to the scanning line), and updates the enlarged area to the update area. Set as Ar (see FIG. 11A).

  In subsequent step S142, the control unit 11 divides the update area Ar into a plurality of rectangular areas Ad so that the image data to be transferred fits in a predetermined data size (see FIG. 11B). Specifically, the control unit 11 divides the update area Ar so that each of the rectangular areas Ad becomes a band-like area extending from the left end to the right end of the update area Ar and is arranged in a direction orthogonal to the scanning line. Therefore, the length of each rectangular area Ad along the direction parallel to the scanning line (that is, the horizontal direction), that is, the horizontal width of each rectangular area Ad is the length of the update area Ar along the direction parallel to the scanning line. That is, it is equal to the horizontal width of the update area Ar. On the other hand, the length of each rectangular area Ad along the direction orthogonal to the scanning line (that is, the vertical direction), that is, the height of each rectangular area Ad (in other words, the number of scanning lines constituting each rectangular area Ad). Is smaller than the length of the update area Ar along the direction orthogonal to the scan line (that is, the vertical direction), that is, the height of the update area Ar (in other words, the number of scan lines constituting the update area Ar). . In the second transfer process, image data and audio data are sent in one packet. However, if both image data and audio data need to be transferred, transfer can be performed once. The maximum data size of simple image data is smaller than that in the first transfer process. Similarly to the first transfer process, when the entire data size of the update area Ar is equal to or smaller than the predetermined data size, there is no need to divide the update area Ar. In this case, the update area Ar is composed of only one rectangular area Ad. Composed.

  In step S143, the control unit 11 sets one rectangular area Ad among the plurality of rectangular areas Ad as a transmission target, and adds image data to the command block 51a in the CBW 51 transmitted prior to the transfer data 52. Stores various related information. Specifically, the control unit 11 displays type information indicating that image data is included in the transfer data 52 and area information indicating the position and size of the rectangular area Ad to be transmitted on the display image Pd. Store. Here, in the second transfer process, the horizontal width of the rectangular area Ad always matches the horizontal width of the display image Pd, and the horizontal position of the upper left corner of the rectangular area Ad is always the left end. It suffices if the vertical position of the upper left corner of the rectangular area Ad and the height of the rectangular area Ad are included. That is, the area information in the second transfer process has a smaller data size than the area information in the first transfer process.

  In step S144, the control unit 11 captures the sound output from the sound output unit 16, and adds the captured sound data to the image data of the rectangular area Ad to be transmitted. As described above, the data size of the audio data to be added is set so that the total data size of the image data and the audio data is within a predetermined packet size (64 Kbytes).

  In step S145, the control unit 11 stores various types of information related to the audio data in the command block 51a of the CBW 51. Specifically, the control unit 11 stores type information indicating that the transfer data 52 includes audio data, size information indicating the data size of the audio data, and the like. If there is no audio data to be output, addition of audio data (step S144) and storage of information related to the audio data in the command block 51a (step S145) are not performed.

  In step S146, the control unit 11 determines whether or not the transmission target rectangular area Ad is the last rectangular area Ad among the divided rectangular areas Ad. If it is the last rectangular area Ad, the process proceeds to step S147. If it is not the last rectangular area Ad, the process proceeds to step S148.

  When the transmission target rectangular area Ad is the last rectangular area Ad and the process proceeds to step S147, the control unit 11 stores update information for updating the image display in the command block 51a of the CBW 51.

  In step S148, the control unit 11 transmits the CBW 51 to the projector 2, and in subsequent step S149, the image data to which the audio data is added is transmitted to the projector 2 as the transfer data 52 (see FIG. 11C). In the second transfer process, since the command block 51 a includes type information, area information, and the like, it is not necessary to add header information 52 h to the transfer data 52. In step S150, the USB communication unit 17 receives the CSW 53 transmitted from the projector 2 (see FIG. 11C).

  After that, in step S151, the control unit 11 determines whether or not the transmission target rectangular area Ad is the last rectangular area Ad, and ends the flow in the last case. If it is not the last, the process returns to step S143, the rectangular area Ad to be transmitted is changed, and the process is repeated until the transmission of the image data is completed for all the rectangular areas Ad. Although explanation is omitted, when the display image Pd is not changed and audio is output, only the audio data may be included in the transfer data 52 in some cases.

  FIG. 12 is a flowchart for explaining the operation of the projector 2 when the transfer data 52 is supplied by the second transfer process. In step S205 (see FIG. 8), the selected transfer process is the second transfer process. In this case, the operation of the projector 2 is shown. FIG. 13 is an explanatory diagram for explaining the operation of the projector 2. FIG. 13A is a diagram showing a data structure of data to be transmitted and received, FIG. 13B is a memory map of the data buffer 25, and FIG. () Is a memory map of the frame buffer 26, and (d) is a diagram showing a projected image Pp projected from the projector 2.

  As shown in FIG. 12, in step S220, the control unit 21 analyzes the command block 51a of the CBW 51 stored in the FIFO 24a.

  In subsequent step S221, the control unit 21 determines whether image data is included in the transfer data 52 based on the type information included in the command block 51a. If image data is included, the process proceeds to step S222. If image data is not included, the process proceeds to step S225.

  When the transfer data 52 includes image data and the process proceeds to step S222, the control unit 21 instructs the DMA transfer unit 28 to transfer the image data included in the transfer data 52 from the FIFO 24a to the frame buffer 26. DMA transfer is performed (see FIGS. 13A and 13C). As described above, in the first transfer process, the image data is stored in the frame buffer 26 after being stored in the data buffer 25, whereas in the second transfer process, the image data is not passed through the data buffer 25. Stored in the frame buffer 26. At this time, the control unit 21 derives the position (address) on the frame buffer 26 of the target rectangular area Ad based on the area information included in the command block 51a, and transfers the transferred image data to this position. Store. Here, in the present embodiment, the update area Ar reaches the left and right ends of the display image Pd, and the update area Ar is divided into a plurality of rectangular areas Ad arranged in the vertical direction (direction orthogonal to the scanning line). Therefore, the image data of each rectangular area Ad has a continuous drawing order and is stored at consecutive addresses. For this reason, as long as the leading position of each rectangular area Ad is derived, it is sufficient to store image data continuously thereafter, and the processing is simple.

  In step S223, the control unit 21 determines whether update information is included in the command block 51a based on the analysis result of the command block 51a. If update information is included, the process proceeds to step S224. If update information is not included, the process proceeds to step S225.

  When the command block 51a includes update information and the process proceeds to step S224, the control unit 21 instructs the image processing unit 29 to frame one frame of image data stored in the frame buffer 26. The data is transferred to the memory 27. As a result, the display image Pd in which the update area Ar is rewritten is projected as the projection image Pp from the image projection unit 40 of the projector 2 (see FIG. 13D) and displayed on the screen SC.

  In step S225, the control unit 21 determines whether or not audio data is included in the transfer data 52 based on the type information included in the command block 51a. If the audio data is included, the process proceeds to step S226. If the audio data is not included, the process proceeds to step S228.

  When the transfer data 52 includes audio data and the process proceeds to step S226, the control unit 21 instructs the DMA transfer unit 28 to transfer the audio data included in the transfer data 52 from the FIFO 24a to the data buffer 25. DMA transfer is performed (see FIGS. 13A and 13B). As described above, in the second transfer process, the image data is stored in the frame buffer 26 from the FIFO 24a without passing through the data buffer 25 (see step S222), whereas for the audio data, the first transfer process is performed. Similarly to the above, the data is stored in the data buffer 25 from the FIFO 24a. Thereafter, in step S227, the control unit 21 transfers the audio data transferred to the data buffer 25 to the audio output unit 30, and outputs the audio.

  In step S228, the control unit 21 transmits the CSW 53 indicating that the transfer data 52 has been normally received from the USB communication unit 24 to the computer 1, and ends the process.

  In the present embodiment, the operation of the control unit 21 in steps S220 to S228 is an operation based on various drivers stored in the storage unit 22.

  As described above, according to the image display system 100 of the present embodiment, the following effects can be obtained.

  (1) According to the image display system 100 of the present embodiment, in the second transfer process, the computer 1 expands the change area Am in which the display content has changed to both ends in the horizontal direction (direction parallel to the scanning line). Since the image data of the enlarged area (update area Ar) is transmitted to the projector 2, the image data with continuous addresses is transmitted to the projector 2. For this reason, the process of specifying the position of the update area Ar in the projector 2 is facilitated, and the load when displaying an image on the projector 2 can be reduced.

  (2) According to the image display system 100 of the present embodiment, in the second transfer process, the computer 1 is arranged in the vertical direction (direction perpendicular to the scanning line) when it is necessary to divide the update area Ar. Since the image data is divided into a plurality of areas, the addresses of the image data are continuous in each divided area, and the process of specifying the position of the area becomes easy.

  (3) According to the image display system 100 of the present embodiment, the computer 1 selects the first transfer process and the second transfer process based on the size of the change area Am. Regardless of the size of the area, the image data can always be transferred by an appropriate method.

  (4) According to the image display system 100 of the present embodiment, in the second transfer process, the command block 51a of the CBW 51 transmitted prior to the transmission of the transfer data 52 is instructed to indicate the position of the change area Am. Since the area information is included, it is not necessary to include the area information in the transfer data 52. As a result, the projector 2 can omit the step of storing the received transfer data 52 in the data buffer 25 and analyzing the region information (steps S206 and S208 in the first transfer process). It is possible to reduce the load when displaying an image.

  (5) According to the image display system 100 of the present embodiment, in the second transfer process, since the computer 1 transmits data in which audio data is added to the image data as the transfer data 52, the number of data transfers Thus, the efficiency of data transmission / reception and the processing associated therewith is improved.

  (6) According to the image display system 100 of the present embodiment, in the second transfer process, the computer 1 uses the CBW 51 command to display the type information indicating that the transfer data 52 includes image data and audio data. Since the data is stored in the block 51a, the projector 2 can recognize that the transfer data 52 includes image data and audio data by referring to the command block 51a. For this reason, the efficiency at the time of processing the received transfer data 52 is improved.

  In this embodiment, the control unit 11 when executing step S102 to detect the change area Am corresponds to the detection unit, and the control unit 11 when selecting transfer processing by executing steps S103 and S104. Corresponding to the selection unit, the control unit 11 when executing step S141 to expand the change area Am corresponds to the area expansion unit, and when executing step S142 to divide the update area Ar into a plurality of rectangular areas Ad. The control unit 11 corresponds to the area dividing unit, and the control unit 11 when executing steps S143 and S145 to store various information in the command block 51a of the CBW 51 corresponds to the control information generating unit, and executes step S144. The control unit 11 when adding audio data to the image data corresponds to the data generation unit. The USB communication units 17 and 24 correspond to the communication unit.

(Modification)
Moreover, you may change the said embodiment as follows.

  In the above embodiment, in the second transfer process, the change area Am is expanded to both ends, and the area information is stored in the command block 51a of the CBW 51. It is not limited. For example, the image data of the update area Ar obtained by enlarging the change area Am may be transmitted with the header information 52h added as in the first transfer process. Further, the area information of the change area Am may be stored in the command block 51a of the CBW 51 without enlarging the change area Am. Thus, the aspect which implements only any one of expanding the change area | region Am to both ends, and storing area | region information in the command block 51a may be sufficient.

  In the above-described embodiment, the transfer process is selected depending on whether the height and width of the change area Am exceed a predetermined threshold, but the conditions for selecting the transfer process are not limited to this. Even if the amount of data to be transferred increases due to the enlargement of the change area Am, the second transfer process is selected when the processing efficiency in data transfer and image display is improved due to continuous addresses for storing image data. What should I do?

  In the above embodiment, the computer 1 selects one of the first transfer process and the second transfer process based on a predetermined condition. However, the present invention is not limited to this mode. For example, the second transfer process may always be used.

  In the above embodiment, the data supply program Sp executed by the computer 1 is stored in the storage unit 22 of the projector 2, and when the projector 2 is connected to the computer 1, the data supply program Sp from the projector 2 to the computer 1 is stored. May be transferred and installed in the storage device 14. Alternatively, the computer 1 may be read and activated from the storage unit 22 of the projector 2 without being installed in the storage device 14.

  In the above embodiment, the computer 1 (notebook type personal computer) integrally provided with the display device 13 and the input device 15 has been described as an example of the image supply device. However, the image supply device may be a laptop personal computer. It is not limited. For example, it may be a portable information device, or a computer having a configuration in which the display device 13 and the input device 15 are externally connected, such as a desktop personal computer.

  In the embodiment described above, the image data is supplied from the computer 1 to the projector 2 by USB communication. However, the image data supply mode is not limited to this. For example, the present invention can be applied to a mode in which image data is supplied via a wired or wireless network.

  In the above embodiment, the three-plate projector 2 using the three liquid crystal light valves 42R, 42G, and 42B as the light modulation device has been described, but the present invention is not limited to this. For example, it is possible to form an image with one liquid crystal light valve that includes sub-pixels that can transmit R light, G light, and B light in each pixel.

  In the above-described embodiment, the transmissive liquid crystal light valves 42R, 42G, and 42B are used as the light modulator, but a reflective light modulator such as a reflective liquid crystal light valve can also be used. In addition, it is possible to use a micromirror array device that modulates light emitted from a light source by controlling the emission direction of incident light for each micromirror as a pixel.

  In the above embodiment, the light source 41 is constituted by a discharge-type light source lamp 41a. However, the light source 41 can also be applied to a solid light source such as an LED (Light Emitting Diode) light source or a laser light source, or other light sources. .

  In the above embodiment, the projector 2 is described as an example of the image display device, but the image display device is not limited to the projector 2. For example, the present invention can also be applied to other image display devices such as a rear projector, a liquid crystal display, a plasma display, and an organic EL (Electro Luminescence) display that are integrally provided with a transmissive screen.

  In the above embodiment, a configuration is shown in which image data and the like are supplied from a computer 1 as an image supply device to a projector 2 as an image display device, but the present invention is not limited to this. For example, the present invention can be applied to a configuration in which image data or the like is supplied from an image supply device to an external device (for example, a storage device) other than the image display device.

  DESCRIPTION OF SYMBOLS 1 ... Computer, 2 ... Projector, 3 ... USB cable, 11 ... Control part, 11a ... CPU, 11b ... RAM, 12 ... Display control part, 12a ... VRAM, 13 ... Display apparatus, 14 ... Storage device, 15 ... Input device 16 ... Audio output unit, 17 ... USB communication unit, 18 ... Bus, 21 ... Control unit, 21a ... CPU, 21b ... RAM, 22 ... Storage unit, 23 ... Input operation unit, 24 ... USB communication unit, 24a ... FIFO 25 ... Data buffer, 26 ... Frame buffer, 27 ... Frame memory, 28 ... DMA transfer unit, 29 ... Image processing unit, 30 ... Audio output unit, 31 ... Bus, 40 ... Image projection unit, 41 ... Light source, 41a ... Light source lamp, 42R, 42G, 42B ... Liquid crystal light valve, 43 ... Projection lens, 44 ... Liquid crystal drive unit, 51 ... CBW, 51a ... Command block, 2 ... Transfer data, 52a ... Data body, 52h ... Header information, 53 ... CSW, 100 ... Image display system, Ad ... Rectangular area, Am ... Change area, Ar ... Update area, Pd ... Display image, Pp ... Projected image, SC: Screen, Sp: Data supply program.

Claims (32)

An image supply device that transmits image data representing a display image to an image display device,
A detection unit for detecting a change area in which display content has changed in the display image;
An area enlargement unit that enlarges the change area to both ends of the display image in a direction parallel to a scanning line of the display image, and sets the enlarged area as an update area;
A communication unit for transmitting the image data of the update area to the image display device;
An image supply apparatus comprising: The image supply device according to claim 1,
A region dividing unit that divides the update region into a plurality of regions arranged in a direction orthogonal to the scanning line;
The image supply device, wherein the communication unit transmits the image data for each of the plurality of regions divided by the region dividing unit. The image supply device according to claim 1, wherein:
A first transfer process for transmitting the image data of the change area to the image display apparatus, and a second transfer process for transmitting the image data of the update area obtained by enlarging the change area to the image display apparatus. An image supply apparatus, further comprising a selection unit that selects based on a size of the change area. The image supply device according to any one of claims 1 to 3,
The image supply device, wherein the communication unit transmits the image data to the image display device by communication based on a USB mass storage class. The image supply device according to any one of claims 1 to 4,
A control information generating unit that generates control information in which commands for the image display device are stored;
The communication unit transmits the control information to the image display device, and after the transmission of the control information, transmits transfer data including image data of the update area to the image display device,
The image supply device, wherein the control information generation unit stores area information for indicating at least one of a position and a size of the update area in the display image in the control information. The image supply device according to claim 5,
The area information includes the position and length of the update area in the direction parallel to the scanning line and the position and length in the direction orthogonal to the scanning line, in the direction orthogonal to the scanning line. Only, the image supply apparatus characterized by the above-mentioned. The image supply device according to claim 5, wherein:
A data generation unit for adding audio data to the image data in the update area;
The image supply device, wherein the communication unit transmits the image data to which the audio data is added as the transfer data. The image supply device according to any one of claims 5 to 7,
The image supply apparatus, wherein the control information generation unit stores type information indicating a type of data included in the transfer data in the control information. A control method for an image supply device for transmitting image data representing a display image to an image display device,
A detection step of detecting a change area in which display content has changed in the display image;
An area enlargement step of enlarging the change area to both ends of the display image in a direction parallel to a scanning line of the display image, and setting the enlarged area as an update area;
A communication step of transmitting the image data of the update area to the image display device;
A method for controlling an image supply apparatus. The image supply device control method according to claim 9,
A region dividing step of dividing the update region into a plurality of regions arranged in a direction perpendicular to the scanning line;
In the communication step, the image data is transmitted for each of the plurality of regions divided in the region dividing step. It is a control method of the image supply device according to claim 9 or 10,
A first transfer process for transmitting the image data of the change area to the image display apparatus, and a second transfer process for transmitting the image data of the update area obtained by enlarging the change area to the image display apparatus. A method for controlling an image supply apparatus, further comprising a selection step of selecting based on a size of the change area. It is a control method of the image supply device according to any one of claims 9-11,
In the communication step, the image data is transmitted to the image display device by communication based on a USB mass storage class. It is a control method of the image supply device according to any one of claims 9 to 12,
A control information generating step for generating control information storing a command for the image display device;
Prior to the communication step, a control information transmission step for transmitting the control information to the image display device;
Further comprising
In the communication step, transfer data including image data in the update area is transmitted,
In the control information generation step, region information for indicating at least one of a position and a size of the update region in the display image is stored in the control information. A method for controlling an image supply device according to claim 13, comprising:
The area information includes the position and length of the update area in the direction parallel to the scanning line and the position and length in the direction orthogonal to the scanning line, in the direction orthogonal to the scanning line. Only, the image supply apparatus control method. The image supply device control method according to claim 13 or 14,
A data generation step of adding audio data to the image data in the update area;
In the communication step, the image data to which the audio data is added is transmitted as the transfer data. A method for controlling an image supply device according to any one of claims 13 to 15,
In the control information generation step, type information indicating a type of data included in the transfer data is stored in the control information. To a computer that transmits image data representing a display image to the image display device,
A detection step of detecting a change area in which display content has changed in the display image;
An area enlargement step of enlarging the change area to both ends of the display image in a direction parallel to a scanning line of the display image, and setting the enlarged area as an update area;
A communication step of transmitting the image data of the update area to the image display device;
A program for running A program according to claim 17,
Causing the computer to further execute a region dividing step of dividing the update region into a plurality of regions arranged in a direction orthogonal to the scanning line;
In the communication step, the image data is transmitted for each of the plurality of regions divided in the region dividing step. The program according to claim 17 or 18,
A first transfer process for transmitting the image data of the change area to the image display apparatus, and a second transfer process for transmitting the image data of the update area obtained by enlarging the change area to the image display apparatus. A program that causes the computer to further execute a selection step of selecting based on the size of the change area. A program according to any one of claims 17 to 19,
In the communication step, the image data is transmitted to the image display device by communication based on a USB mass storage class. It is a program as described in any one of Claims 17-20,
A control information generating step for generating control information storing a command for the image display device;
Prior to the communication step, a control information transmission step for transmitting the control information to the image display device;
Is further executed on the computer,
In the communication step, transfer data including image data in the update area is transmitted,
In the control information generation step, a region information for designating at least one of a position and a size of the update region in the display image is stored in the control information. The program according to claim 21, wherein
The area information includes the position and length of the update area in the direction parallel to the scanning line and the position and length in the direction orthogonal to the scanning line, in the direction orthogonal to the scanning line. A program characterized by only containing. The program according to claim 21 or 22,
Causing the computer to further execute a data generation step of adding audio data to the image data in the update region;
In the communication step, the image data to which the audio data is added is transmitted as the transfer data. A program according to any one of claims 21 to 23,
In the control information generating step, a type information indicating a type of data included in the transfer data is stored in the control information. To a computer that transmits image data representing a display image to the image display device,
A detection step of detecting a change area in which display content has changed in the display image;
An area enlargement step of enlarging the change area to both ends of the display image in a direction parallel to a scanning line of the display image, and setting the enlarged area as an update area;
A communication step of transmitting the image data of the update area to the image display device;
A computer-readable recording medium on which a program for executing the program is recorded. The recording medium according to claim 25, wherein
The program causes the computer to further execute a region dividing step of dividing the update region into a plurality of regions arranged in a direction orthogonal to the scanning line,
In the communication step, the image data is transmitted for each of the plurality of areas divided in the area dividing step. The recording medium according to claim 25 or 26, wherein:
The program includes a first transfer process for transmitting the image data of the change area to the image display device, and a second transfer for transmitting the image data of the update area obtained by enlarging the change area to the image display device. A recording medium that causes the computer to further execute a selection step of selecting a process based on the size of the change area. A recording medium according to any one of claims 25 to 27, wherein
In the communication step, the image data is transmitted to the image display device by communication based on a USB mass storage class. A recording medium according to any one of claims 25 to 28, wherein
The program is
A control information generating step for generating control information storing a command for the image display device;
Prior to the communication step, a control information transmission step for transmitting the control information to the image display device;
Is further executed on the computer,
In the communication step, transfer data including image data in the update area is transmitted,
In the control information generating step, area information for indicating at least one of a position and a size of the update area in the display image is stored in the control information. A recording medium according to claim 29, wherein
The area information includes the position and length of the update area in the direction parallel to the scanning line and the position and length in the direction orthogonal to the scanning line, in the direction orthogonal to the scanning line. A recording medium characterized by including only A recording medium according to claim 29 or 30, wherein
The program further causes the computer to execute a data generation step of adding audio data to the image data in the update area,
In the communication step, the image data to which the audio data is added is transmitted as the transfer data. The recording medium according to any one of claims 29 to 31,
In the control information generating step, type information indicating a type of data included in the transfer data is stored in the control information.

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