JP7358757B2 - Display control device, display control method and program - Google Patents

Description

The present invention relates to a display control device, a display control method, and a program.

2. Description of the Related Art Conventionally, display control devices have been provided that include, as input terminals, digital video signal terminals that utilize encryption technology to prevent unauthorized copying. For example, Patent Document 1 discloses a display control device including an HDMI (registered trademark) (High-Definition Multimedia Interface) terminal as a digital video signal terminal. The HDMI terminal connection standard uses HDCP (High-bandwidth Digital Content Protection) encryption technology.

Japanese Patent Application Publication No. 2013-191945

Content protected by HDCP can be displayed after HDCP authentication processing is completed. This HDCP authentication processing is specified to be completed within a predetermined time after an authentication start signal is output from a source device such as a video disc player or a personal computer (PC) to a sink device such as a display control device. Therefore, if the authentication process is not completed within a predetermined time, the authentication process is continued again. Depending on the timing of signal exchange between the source device and the sink device, the re-authentication process may be repeated and images may not be displayed.

An object of the present invention is to provide a display control device, a display control method, and a program that can quickly perform authentication processing regardless of the type of source device.

The display control device of the present invention includes a control unit that processes an input signal input from a digital video signal terminal and displays it on a display unit, and the control unit selects a predetermined priority according to an authentication start signal among the input signals. Authentication processing is performed in priority order, and it is determined whether or not the authentication processing is completed within a predetermined time, and if it is determined that the authentication processing is not completed within the predetermined time , the predetermined priority is increased. The method is characterized in that the authentication process is performed again.

The display control method of the present invention includes an authentication processing step in which authentication processing is performed in a predetermined priority order based on an authentication start signal among input signals input from a digital video signal terminal, and whether the authentication processing step is completed within a predetermined time. an authentication process completion determination step of determining whether or not the authentication process has been completed; and a re-operation step of raising the predetermined priority and performing the authentication process again if it is determined in the authentication process completion determination step that the authentication process has not been completed. The method is characterized by comprising an authentication processing step.

The program of the present invention is a program executed by a computer built in a device including a digital video signal terminal and a display section, and the program is a program that is executed by a computer built in a device including a digital video signal terminal and a display section, and the computer is configured to receive an authentication start signal among input signals from the digital video signal terminal. performs authentication processing in a predetermined priority order, determines whether or not the authentication processing is completed within a predetermined time, and if it is determined that the authentication processing is not completed within the predetermined time , the predetermined priority order is determined. It functions as a control unit that raises the ranking and performs the authentication process again.

According to the present invention, it is possible to provide a display control device, a display control method, and a program that can quickly perform authentication processing regardless of the type of source device.

1 is a configuration diagram schematically showing a projection system including a display control device according to an embodiment of the present invention. FIG. 1 is a functional circuit block diagram of a display control device according to an embodiment of the present invention. FIG. 2 is a flowchart showing a display control method according to an embodiment of the present invention. FIG. 3 is a sequence chart diagram showing authentication processing according to an embodiment of the present invention.

Hereinafter, modes for carrying out the present invention will be described. FIG. 1 is a schematic diagram showing a projection system 1 including a display control device 10. The display control device 10 is a projection device (projector) that can display an image on the screen SC. The display control device 10 includes an HDMI terminal 11a. On the other hand, a repeater device 70 such as an AV amplifier or a distributor is equipped with input/output terminals compliant with the HDMI standard. Video disc player 80 includes an HDMI output terminal and is connected to an HDMI input terminal of repeater device 70 via HDMI cable 32 . The HDMI output terminal of the repeater device 70 is connected to the HDMI terminal 11a of the display control device 10 via the HDMI cable 31. The projection system 1 can cause the display control device 10 to project videos, images, etc. reproduced by the video disc player 80 onto the screen SC.

FIG. 2 is a functional circuit block diagram of the display control device 10. The display control device 10 includes a CPU 14 that functions as a so-called scaler and controls a projection operation under predetermined projection conditions based on a video signal input from an input unit having an HDMI receiver 11, which is a digital video signal terminal. The CPU 14 (computer) includes a control microcomputer 19 connected to an input section (HDMI receiver 11, A/D conversion section 12, video decoder 13), EDID processing section 15, EEPROM (registered trademark) 16, RAM 17, and RF transceiver 18. It is connected to an audio device 20, a key input section 21, and a display section (position sensor 22, motor driver 23, micromirror element 24, color wheel 25).

The HDMI receiver 11, which is a digital video signal terminal, decodes the HDMI signal, which is a digital video signal input from the HDMI terminal 11a, and outputs it to the CPU 14. The A/D converter 12 digitizes an analog RGB signal input from a VGA terminal (not shown) and outputs it to the CPU 14. The video decoder 13 converts a composite video signal, which is a luminance/chrominance type analog video signal inputted from an RCA pin jack (not shown), into a primary color digital video signal and outputs it to the CPU 14 .

The EDID processing unit 15 executes processing of EDID information with an external device connected via the HDMI receiver 11. The EEPROM 16 is a storage unit that stores programs that cause the CPU 14 to function as a control unit, various fixed data, and the like. The RAM 17 functions as a work memory when the CPU 14 executes control processing.

The RF transceiver 18 transmits and receives data between the display control device 10 and an external device that is wirelessly connected. The control microcomputer 19 collectively controls the entire operation of the display control device 10, including the transmission and reception of data by the RF transceiver 18, except for the control of the projection operation by the CPU 14. The audio device 20 converts the audio signal separated from the video signal into an analog signal, and drives a speaker (not shown) to amplify the sound. The key input unit 21 includes a key operation unit provided on the main body casing of the display control device 10 and a light receiving unit that receives an infrared modulated signal in response to a key operation from a remote controller dedicated to the display control device 10. Sends an operation signal to the CPU 14.

The position sensor 22 is installed facing the rotating peripheral end of the color wheel 25 for emitting primary color light in a time-sharing manner, and detects the proximity of a position marker (not shown) provided on the color wheel 25. This is a sensor for detecting rotational synchronization of the color wheel 25. The motor driver 23 drives a motor (not shown) that rotates the color wheel 25 in the same direction at a constant speed.

The micromirror element 24 performs a display operation by on/off control of the posture and inclination angle of each of a large number of micromirrors arranged in a two-dimensional array. When the primary color light is incident, a projection light image is formed from the reflected light and is emitted toward a screen SC or the like as a projection target via a projection lens system (not shown). A display section for displaying an image on the micromirror element 24 is equipped with a display encoder and a display drive section.

Next, HDCP authentication processing in the display control device 10 will be explained based on the flowchart of FIG. 3 and the sequence chart of FIG. 4. As shown in FIG. 3, when the HDCP authentication process is started, the HDCP authentication process is executed (step S401). Specifically, in FIG. 4, the HDCP authentication process between the sink device (display control device 10) and the source device (repeater device 70) triggers an HDCP authentication start message (step S101) output from the source device 70. is started as. For example, when the source device 70 and the sink device 10 are connected by an HDMI cable, an HDCP authentication start message (step S101) is output from the source device 70 to the sink device 10. The HDCP authentication process is completed when the HDCP authentication completion message (step S107) output from the sink device 10 side is input to the source device 70 (step S402 in FIG. 3). The processing time of the HDCP authentication process (that is, the time required from the HDCP authentication start message (step S101) to the HDCP authentication completion message (step S107)) is specified to be performed during a predetermined time _T0 . If the HDCP authentication process is not completed within the predetermined time _T0 , the HDCP authentication start message (step S201) is outputted from the source device 70 again, and the authentication process is repeated (step S402 in FIG. 3).

In FIG. 4, when the HDCP authentication process is started (step S101), the source device 70 outputs an Rx status (step S102), which is a status signal related to the encryption key. If other processing (for example, settings for bidirectional communication using a handwriting input pen, etc.) is being performed with priority on the sink device 10 side, a valid response signal is sent to the Rx status (step S102). The sink device 10 may not be able to return (reply (no data) (step S103)). If the source device 70 does not receive a valid reply corresponding to the output Rx status (step S102) from the sink device 10, it outputs the Rx status again (step S104) after a time interval _T1 . If the sink device 10 is able to return a valid response signal (reply (with data) (step S105)) corresponding to this Rx status (step S104), a read message (step S106) is output from the source device. Then, the sink device 10 outputs an HDCP authentication completion message (step S107), and the HDCP authentication process is completed.

Here, the time interval _T1 at which the Rx status (steps S102, S104) is output differs depending on the source device. For example, some video disc players have a time of 1.4 msec, and some distributors have a time of 20 msec. Therefore, if the time interval _T1 at which the Rx status (steps S102, S104) is output is sufficiently smaller than the predetermined time _T0 , which is the specified time, the sink device 10 will perform Rx multiple times within the predetermined time _T0 . Since the status (steps S102 and S104) can be received, the authentication process can be completed within the predetermined time _T0 (for example, when the display control device 10 and the video disc player 80 are directly connected with an HDMI cable). .

On the other hand, as in the present embodiment, when the display control device 10 and the video disc player 80 are connected via a repeater device 70 such as a distributor, that is, the time when the Rx status (steps S102 and S104) is output. If the interval _T1 is equal to or greater than the predetermined time _T0 , the next HDCP authentication start message (step S201) is output before the second and subsequent Rx statuses (step S104) are output from the source device. Therefore, the authentication process may not be completed within the predetermined time _T0 , and the re-authentication process may be repeated.

Therefore, in the display control device 10, HDCP authentication processing is performed using the following display control method.
Authentication processing step: The authentication start signal (HDCP authentication start message (step S101)) input from the digital video signal terminal (HDMI terminal 11a, HDMI receiver 11) causes a predetermined priority order (task priority) (i.e., initial value) to perform HDCP authentication processing (steps S401 and S402 in FIG. 4).

Authentication processing completion determination step: It is determined whether the authentication processing step is completed within a predetermined time _T0 .
Re-authentication processing step: If it is determined in the authentication processing completion determination step that the authentication processing step is not completed, the predetermined priority is raised, for example, the task priority is set to the highest (step S405), and the processing is performed again. Authentication processing is executed (step S401).
If it is determined in the authentication processing completion determination step that the authentication processing step has been completed, a predetermined priority order is set to be returned to the initial value (step S404).

In this way, when the HDCP authentication process is performed again, the priority of the authentication process is raised and more of the load of the CPU 14, which functions as a control unit, is allocated to the authentication process. This process ensures that the authentication process is completed. After the authentication process is completed, the control unit returns the raised priority of the authentication process to its original value (initial value). Thereby, when the display control device 10 is to be used again, the display control device 10 can prepare for display using the initial settings that give priority to other processes with a high load.

In addition, in this embodiment, the predetermined priority is raised so that the priority in the re-authentication processing step is the highest, but the priority is not limited to this, and the priority may be gradually raised in each re-authentication processing step. good.

Further, the display control device 10 is a DLP type projection device (projector) including a micromirror element 24 called a DMD (digital micromirror device), but is not limited to this. For example, a high-pressure mercury lamp is used as a light source, and a color liquid crystal display It may also be a projector using a panel. Further, the display control device 10 is not limited to a projection device (projector), and may be a display control device such as a display. Further, in this embodiment, the digital video signal terminal is HDMI, and the authentication process of HDCP is taken as an example, but other authentication processes of input signals from the terminal of digital video signal of other standards may be performed.

For example, other digital video signals using HDCP include DisplayPort, MHL, HDBaseT, WirelessHD, and the like. In addition, encryption technologies for copy protection are not limited to HDCP, but include DTCP (Digital Transmission Content Protection), CSS (Content Scramble System), and AACS (Advanced Access Content Protection). System), etc., it can be similarly applied. be.

As described above, the display control device 10 of the present embodiment includes a control unit (CPU 14) that processes input signals input from the digital video signal terminal (HDMI terminal 11a, HDMI receiver 11) and displays the processed signal on the display unit. starts authentication processing in a predetermined priority order based on an authentication start signal (HDCP authentication start message (step S101)) among input signals, and if the authentication processing is not completed within a predetermined time _T0 , a predetermined Raise the priority and perform the authentication process again.

As a result, in the re-authentication process, the control unit, which was prioritizing other processes, gives priority to the authentication process. Therefore, it is possible to provide a display control device that can quickly perform authentication processing regardless of the type of source device.

In addition, the control unit returns the predetermined priority order to the initial value after completion of the authentication process when the predetermined priority order is raised and the authentication process is performed again. Thereby, only when re-authentication processing is performed, it is possible to increase the predetermined priority of the authentication processing.

Further, the digital video signal terminal is connected to a repeater device 70. Thereby, even if a repeater device that outputs status signals at long intervals is connected to the display control device 10, the authentication process can be performed quickly.

Further, the digital video signal terminal is an HDMI receiver 11 including an HDMI terminal 11a, and the authentication process is an HDCP authentication process defined by HDMI. Thereby, the display control device 10 can be quickly connected to a device equipped with an HDMI terminal, which has become popular in recent years.

Further, the display control method of the display control device 10 includes an authentication processing step in which authentication processing is performed in a predetermined priority order based on an authentication start signal among input signals input from a digital video signal terminal, and an authentication processing step in which the authentication processing step is performed within a predetermined time. an authentication processing completion determination step for determining whether or not the authentication processing has been completed; and if it is determined in the authentication processing completion determination step that the authentication processing step is not completed, the predetermined priority is raised and the authentication processing is performed again. and a re-authentication processing step. Thereby, it is possible to provide a display control method for the display control device 10 in which authentication processing is performed quickly and smoothly.

Further, a program that causes the CPU 14 of the display control device 10 to function as a control section is a program executed by a computer built in the device including a digital video signal terminal and a display section, The authentication process is started in a predetermined priority order by an authentication start signal among the input signals from the terminal, and if the authentication process is not completed within a predetermined time, the predetermined priority order is increased and the authentication process is started. Do it again. Thereby, it is possible to provide a program for the display control device 10 that allows the authentication process to be performed quickly and smoothly.

Note that the embodiments described above are presented as examples, and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and gist of the invention, as well as within the scope of the invention described in the claims and its equivalents.

Below, the invention described in the first claim of the present application will be added.
[1] A control unit that processes an input signal input from a digital video signal terminal and displays it on a display unit, and the control unit performs authentication processing in a predetermined priority order according to an authentication start signal among the input signals. A display control device characterized in that if the authentication process is started and not completed within a predetermined time, the predetermined priority is raised and the authentication process is performed again.
[2] The control unit returns the predetermined priority order to an initial value after the authentication processing is completed when the predetermined priority order is raised and the authentication processing is performed again. ] The display control device according to.
[3] The display control device according to [1] or [2], wherein the digital video signal terminal is connected to a repeater device.
[4] The display control device according to any one of [1] to [3] above, wherein the digital video signal terminal is an HDMI terminal, and the authentication process is a process for HDCP authentication. .
[5] an authentication processing step of performing authentication processing in a predetermined priority order based on an authentication start signal among the input signals input from the digital video signal terminal;
an authentication processing completion determination step of determining whether the authentication processing step is completed within a predetermined time;
If it is determined in the authentication processing completion determination step that the authentication processing step is not completed, a re-authentication processing step of raising the predetermined priority and performing the authentication processing again;
A display control method comprising:
[6] A program executed by a computer built into a device equipped with a digital video signal terminal and a display unit, the computer comprising:
Authentication processing is started in a predetermined priority order based on an authentication start signal among the input signals from the digital video signal terminal, and if the authentication processing is not completed within a predetermined time, the predetermined priority order is raised. A program that functions as a control unit that performs the authentication process again.

1 Projection system 10 Display control device (sink device)
11 HDMI receiver 11a HDMI terminal 12 A/D conversion section 13 Video decoder 14 CPU 15 EDID processing section 17 RAM 18 RF transceiver 19 Control microcomputer 20 Audio device 21 Key input section 22 Position sensor 23 Motor driver 24 Micromirror element 25 Color wheel 31 HDMI cable 32 HDMI cable 70 Repeater device (source device) 80 Video disc player (source device)

Claims (6)

It has a control unit that processes the input signal input from the digital video signal terminal and displays it on the display unit,
The control unit includes:
Performing authentication processing in a predetermined priority order based on an authentication start signal among the input signals,
determining whether the authentication process is completed within a predetermined time;
A display control device characterized in that when it is determined that the authentication process is not completed within the predetermined time , the predetermined priority is raised and the authentication process is performed again. 2. The control unit returns the predetermined priority to an initial value after the authentication process is completed when the predetermined priority is increased and the authentication process is performed again. Display control device. 3. The display control device according to claim 1, wherein the digital video signal terminal is connected to a repeater device. 4. The display control device according to claim 1, wherein the digital video signal terminal is an HDMI terminal, and the authentication process is a process for HDCP authentication. an authentication processing step of performing authentication processing in a predetermined priority order based on an authentication start signal among input signals input from a digital video signal terminal;
an authentication processing completion determination step of determining whether the authentication processing step is completed within a predetermined time;
If it is determined in the authentication processing completion determination step that the authentication processing step is not completed, a re-authentication processing step of raising the predetermined priority and performing the authentication processing again;
A display control method comprising: A program executed by a computer built into a device equipped with a digital video signal terminal and a display section, the computer
Performing authentication processing in a predetermined priority order based on an authentication start signal among the input signals from the digital video signal terminal,
determining whether the authentication process is completed within a predetermined time;
If it is determined that the authentication process is not completed within the predetermined time , the program functions as a control unit that raises the predetermined priority and performs the authentication process again.

Images