DISPLAY CONTROL DEVICE, DISPLAY SYSTEM, DISPLAY CONTROL METHOD, AND DISPLAY CONTROL PROGRAM

Abstract

To provide a display control device, a display system, a display control method, and a display control program which can detect an abnormality of screen display due to noise generated at a cable for connecting the display control device and a display device.SOLUTION: A display control device transmits a first display signal for making a display device perform display so as to make it branch into a first comparison signal and a second display signal. The second display signal branches into a second comparison signal and a third display signal in the display device. The display control device compares the first and second comparison signals so as to warn a user on the basis of a result of the comparison between the first and second comparison signals.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a display control device, a display system, a display control method, and a display control program. [Background technology]

[0002] In a configuration in which a display control device and a display device are connected, an abnormality may occur in the screen display of the display device.

[0003] Therefore, Patent Document 1 describes a video signal abnormality detection device that detects abnormality in a video signal when a video signal is input from an imaging means such as a camera. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2017-169120 A Summary of the Invention [Problem to be solved by the invention]

[0005] The video signal abnormality detection device described in Patent Document 1 may not be able to detect abnormalities in the screen display caused by noise occurring in a cable connecting the display control device and the display device.

[0006] An object of the present disclosure is to provide a display control device, a display control method, and a display control program that make it possible to detect abnormalities in the screen display caused by noise generated in a cable connecting the display control device and the display device. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, in one aspect of the present disclosure, a display control device includes a transmitting means for transmitting a first display signal to be displayed on a display device, a branching means for branching the first display signal into a first comparison signal and a second display signal, a comparing means for comparing the first comparison signal with a second comparison signal into which the second display signal is branched in the display device, and a warning means for issuing a warning based on a comparison result between the first comparison signal and the second comparison signal.

[0008] In order to solve the above-mentioned problems, in one aspect of the present disclosure, a display control method includes transmitting a first display signal to be displayed on a display device, branching the first display signal into a first comparison signal and a second display signal, comparing the first comparison signal with a second comparison signal into which the second display signal is branched in the display device, and issuing a warning based on a comparison result between the first comparison signal and the second comparison signal.

[0009] In order to solve the above-mentioned problems, in one aspect of the present disclosure, a display control program causes a computer to execute a process of transmitting a first display signal to be displayed on a display device, branching the first display signal into a first comparison signal and a second display signal, comparing the first comparison signal with a second comparison signal into which the second display signal is branched at the display device, and issuing a warning based on a comparison result between the first comparison signal and the second comparison signal. Effect of the Invention

[0010] According to the present disclosure, it is possible to detect abnormalities in a screen display caused by noise occurring in a cable connecting a display control device and a display device. [Brief description of the drawings]

[0011] [Figure 1] 1 is a block diagram showing an example configuration of a display system 1 according to the present disclosure. [Diagram 2] 1 is a diagram illustrating an example of a hardware configuration of a display system 1 according to the present disclosure. [Diagram 3] FIG. 13 is a diagram showing a modified example of the hardware configuration of the display system 1 according to the present disclosure. [Figure 4]4A to 4C are diagrams showing examples of a first comparison signal and a second comparison signal, and examples of display content when each signal is received, according to the present disclosure. [Diagram 5] 4A to 4C are diagrams showing examples of a first comparison signal and a second comparison signal, and examples of display content when each signal is received, according to the present disclosure. [Figure 6] 4A to 4C are diagrams showing examples of a first comparison signal and a second comparison signal, and examples of display content when each signal is received, according to the present disclosure. [Figure 7] 4 is a sequence diagram showing the operation of the display system 1 according to the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

[0013] FIG. 1 is a block diagram showing an example of the configuration of a display system according to the present disclosure. The display system according to the present disclosure includes a display control device 11 and a display device 12. The display control device 11 controls the display of the display device 12. The display control device 11 is connected to the display device 12 via a cable. Here, the number of display devices 12 connected to the display control device 11 may be one or more. The display control device 1 is, for example, a personal computer, and the display device 12 is, for example, a display. The display control device 1 and the display device 12 are not limited to these.

[0014] Here, an example of a hardware configuration of the display system 1 according to the present disclosure will be described with reference to Fig. 2. Fig. 2 is a diagram showing an example of a hardware configuration of the display system 1 according to the present disclosure. The display system 1 includes a display control device 21 and a display device 22.

[0015] The display control device 21 includes a CPU (Central Processing Unit) 211, a comparator 213, and a branch IC (Integrated Circuit) 212. The display control device 21 may also include an LVDS (Low Voltage Differential Signaling) controller 214.

[0016] The CPU 211 outputs a video signal to be displayed on a display device. Therefore, the transmission unit 111 is realized by the CPU 211. The configuration for realizing the transmission unit 111 is not limited to a CPU. For example, a GPU (Graphic Processing Unit) may be used. Furthermore, the warning unit 114 may be realized by the CPU 211.

[0017] The branching IC 212 branches the input signal. The branching unit 112 is realized by the branching IC 212. The comparator 213 compares the two types of input signals and outputs a signal according to the comparison result. The comparing unit 113 is realized by the comparator 213. The warning unit 114 may also be realized by the comparator 213.

[0018] The LVDS controller 214 converts the display port signal into an LVDS signal. When the display control device 11 includes the conversion unit 115, the conversion unit 115 is realized by the LVDS controller 214.

[0019] The display device 22 receives the video signal and displays the video. The display device 22 is, for example, a liquid crystal display (LCD) panel, but is not limited to this. The display device 22 includes a branching IC 221 and a receiver 222.

[0020] The branching IC 221 is an IC having the same function as the above-mentioned branching IC 212. The branching unit 121 is realized by the branching IC 221.

[0021] The receiver 222 receives the display signal. The receiving unit 122 is realized by the receiver 222.

[0022] 3 is a diagram showing a modified example of the hardware configuration of the display system 1 in the present disclosure. The comparator 213 in the display control device 21 may be included in the CPU 211. Furthermore, without being limited to the configuration example of FIG. 3, each of the components shown in FIG. 2 and FIG. 3 may be realized by an individual chip, or may be realized by a chip in which two or more elements of each component are integrated into one chip.

[0023] 1 again, a description will be given of each component of the display system 1. The display system 1 includes a display control device 11 and a display device 12.

[0024] The display control device 11 includes a transmission unit 111, a branching unit 112, a comparison unit 113, and a warning unit 114 as main components.

[0025] The transmission unit 111 is one aspect of a transmission means that transmits a first display signal to be displayed on the display device 12. The transmission unit 111 controls the display content of the display device 12. The transmission unit 111 transmits the first display signal to the display device 12.

[0026] Branching unit 112 is one aspect of branching means for branching a first display signal into a first comparison signal and a second display signal. Branching unit 112 receives the first display signal from transmitting unit 111. Branching unit 112 then branches the first display signal into a first comparison signal and a second display signal. The second display signal is transmitted from branching unit 112 to display device 12. Also, the first comparison signal is transmitted from branching unit 112 to comparing unit 113. Here, the second display signal branched from the first display signal and the first comparison signal are the same.

[0027] The comparison unit 113 is one aspect of a comparison means that compares the first comparison signal with a second comparison signal that is a branch of the second display signal in the display device. First, the comparison unit 113 receives the first comparison signal from the branching unit 112. The comparison unit 113 also receives a second comparison signal. Here, the second comparison signal is a signal that is a branch of the second display signal transmitted to the display device 12 in the display device 12. In other words, the second comparison signal is a signal transmitted from the display control device 11 to the display device via a cable.

[0028] Then, the comparison unit 113 compares the first comparison signal with the second comparison signal. The comparison unit 113 receives the first comparison signal from the branch unit 112. The second comparison signal is the same as the second display signal transmitted to the display device 12 via the cable. The comparison unit 113 compares the first display signal with the second comparison signal. Then, the comparison unit 113 transmits the comparison result between the first comparison signal and the second comparison signal to the warning unit 114.

[0029] Here, the comparison between the first comparison signal and the second comparison signal in the comparing unit 113 will be described with reference to Fig. 4 to Fig. 6. The case where the first comparison signal and the second comparison signal are, for example, LVDS signals will be described. Also, the case where the first comparison signal and the second comparison signal are 4 bits will be described. The formats of the first comparison signal and the second comparison signal are not limited to these.

[0030] FIG. 4 is a diagram showing examples of a first comparison signal and a second comparison signal according to the present disclosure, and examples of display contents when each signal is received. First, FIG. 4 shows an example of an LVDS signal which is the first comparison signal, and an example of an LVDS signal which is the second comparison signal. The first comparison signal and the second comparison signal are represented by data lines 1 to 4, respectively. FIG. 4 also shows an example of a screen displayed by the display device 12 when the display device 12 receives the first comparison signal. Similarly, FIG. 4 shows an example of a screen displayed by the display device 12 when the display device 12 receives the second comparison signal.

[0031] 4, all of the data included in the first comparison signal is "A". The data "A" is a signal that causes the screen of display device 12 to display the capital letter "A". As an example of a screen that display device 12 displays when display device 12 receives the first comparison signal, a screen displaying "A" is shown. In this example, the state in which the capital letter "A" is displayed on the screen is called a normal display. A normal display is a state in which a screen that is exactly like the display signal sent by display control device 11 is displayed on display device 12.

[0032] 4 contains all "A" data. That is, like the first comparison signal, it is a signal that causes a capital "A" to be displayed on the screen. Therefore, when display device 12 receives the second comparison signal, the screen of display device 12 displays a capital "A", which is a normal display.

[0033] Here, the first comparison signal and the second comparison signal are compared. All data included in the data lines 1 to 4 of the first comparison signal and the second comparison signal at a specific time are "A" and are the same. That is, there is no difference between the first comparison signal and the second comparison signal. The second comparison signal is the same as the second display signal transmitted to the display device 12 via the cable. Also, the first comparison signal is the same as the first display signal. Therefore, the first display signal transmitted by the transmission unit 111 and the second display signal transmitted to the display device 12 are the same. Therefore, the screen displayed on the display device 12 is the same as the screen displayed by the first display signal. That is, the screen that should be displayed by the signal from the display control device 11 is displayed normally on the display device 12. This is a state in which no abnormality occurs in the screen display.

[0034] Next, Fig. 5 is a diagram showing another example of the first comparison signal and the second comparison signal according to the present disclosure, and the display contents when each signal is received. In Fig. 5, the data of the second comparison signal is different from that in Fig. 4. In Fig. 5, the screen display when the display device 12 receives the second display signal is also different from that in Fig. 2 due to the difference in the data of the second comparison signal.

[0035] First, the data of the first comparison signal is the same as the data of the first comparison signal in FIG. 4. Therefore, the screen displayed by the first comparison signal is a capital letter "A", which is a normal display. However, the data of the second comparison signal is "F". Here, the data "F" is a signal that displays the screen in black. In other words, when the display device 12 receives the second comparison signal, the screen displayed by the display device 12 is a solid black screen. Such a solid-color screen display is called an unintended monochromatic display. An unintended monochromatic display is an example of an abnormality in the screen display.

[0036] When the first comparison signal and all of the second comparison signals are different, the screen displayed by the display device 12 will be an unintended monochromatic display. Here, when the first comparison signal and all of the second comparison signals are different, all of the data included in the data lines 1 to 4 at all times are different. One of the causes of all of the second comparison signals being different from the first comparison signal is the influence of external noise on the cable transmitting the display signal. In other words, it is considered that the second display signal has changed due to external noise on the cable transmitting the second display signal. Therefore, it is considered that all of the second comparison signals branched from the second display signal are different from the first comparison signal. The comparator 113 detects an abnormality in the screen display caused by the influence of external noise on the cable by comparing the first comparison signal with the second comparison signal.

[0037] Fig. 6 is a diagram showing yet another first comparison signal and second comparison signal according to the present disclosure, and the display contents when each signal is received. In Fig. 6, the data of the second comparison signal is different from Figs. 4 and 5. In Fig. 6, the screen display when the display device 12 receives the second display signal is also different from Figs. 4 and 5 due to the difference in the data of the second comparison signal.

[0038] First, the data of the first comparison signal is the same as the data of the first comparison signal in FIG. 4. Therefore, when the display device 12 receives the first comparison signal, the screen displayed by the display device 12 is a capital letter "A", which is a normal display. However, in FIG. 6, the data of the second comparison signal is different from the data of the first comparison signal. At a specific time, the data included in the data lines 1 to 4 of the first comparison signal and the second comparison signal are compared. The data included in the data lines 1 to 4 of the first comparison signal and the second comparison signal at a specific time includes "A" and data different from "A". In this way, a case where a part of the data included in the data lines 1 to 4 of the first comparison signal and the second comparison signal at a specific time is different is defined as a case where a part of the first comparison signal and a part of the second comparison signal are different. The case where a part of the first comparison signal and a part of the second comparison signal are different may also include the following cases. For example, a case where a part of the data included in the data lines 1 to 4 of the first comparison signal and the second comparison signal at a certain time is different, but all of the data included in the data lines 1 to 4 of the first comparison signal and the second comparison signal at another time is different.

[0039] Each data item causes the display device 12 to display a different screen. FIG. 6 shows an example of a screen that the display device 12 displays when the display device 12 receives a second comparison signal. As shown in FIG. 6, the screen displayed by the display device 12 shows part of the capital letter "A", but half of the screen is not displayed normally. A screen display in which part of the screen is not displayed normally like this is called a screen flickering display. A screen flickering display is also an example of a screen display abnormality.

[0040] One of the possible causes of the screen displayed by the display device 12 flickering, that is, the occurrence of an abnormality in the screen display, is the influence of external noise on the cable that transmits the second display signal. The second display signal changes due to the influence of external noise on the cable that transmits the second display signal, causing a difference between a part of the first comparison signal and a part of the second comparison signal. The comparator 113 detects the abnormality in the screen display caused by the influence of external noise on the cable by comparing the first comparison signal with the second comparison signal.

[0041] The cases where the first comparison signal and the second comparison signal are partially different may include the following cases. For example, at a certain time, some of the data included in the data lines 1 to 4 of the first comparison signal and the second comparison signal are different, but at another time, all of the data included in the data lines 1 to 4 of the first comparison signal and the second comparison signal are different. Another example is when the data included in the data lines 1 to 4 of the first comparison signal and the second comparison signal are the same at a certain time, but all or a part of the data included in the data lines 1 to 4 of the first comparison signal and the second comparison signal are different at another time. In other words, if the data included in the data lines 1 to 4 of the first comparison signal and the second comparison signal are different by even one bit at any time, it is considered that the first comparison signal and the second comparison signal are partially different. The data of the first comparison signal and the second comparison signal are not limited to the above example.

[0042] The specific data included in the first comparison signal and the second comparison signal are not limited to those described above. When there is a difference between the first comparison signal and the second comparison signal, the first display signal transmitted by the transmitting unit 111 and the second display signal transmitted to the display device 12 are different. One of the causes of this is considered to be that the second display signal has changed due to the influence of external noise on the cable that transmits the second display signal. Therefore, the screen displayed on the display device 12 by the second display signal is different from the screen displayed by the first display signal. In other words, when there is a difference between the first comparison signal and the second comparison signal, an abnormality in the screen display has occurred.

[0043] The warning unit 114 is one aspect of a warning means that issues a warning based on a comparison result between the first comparison signal and the second comparison signal. The warning unit 114 issues a warning based on a comparison result between the first comparison signal and the second comparison signal in the comparison unit 113. The warning will be described later.

[0044] Warning unit 114 issues a warning when there is a difference between the first comparison signal and the second comparison signal in the comparison result received by warning unit 114 from comparison unit 113. This is because a difference between the first comparison signal and the second comparison signal indicates a state in which an abnormality in the screen display has occurred due to the influence of external noise on the cable.

[0045] On the other hand, when there is no difference between the first comparison signal and the second comparison signal, there is no effect of external noise on the cable and no abnormality in the screen display. Therefore, the warning unit 114 does not issue a warning when there is no difference between the first comparison signal and the second comparison signal. Alternatively, the warning unit 114 may output a message indicating that there is no difference between the first comparison signal and the second comparison signal.

[0046] The warning by the warning unit 114 will be described. The warning unit 114 may warn the transmission unit 111 of the occurrence of an abnormality in the screen display due to the influence of external noise on the cable. Also, it may warn an external device (not shown) of the occurrence of an abnormality in the screen display due to the influence of external noise on the cable. The external device includes, for example, a light (not shown) connected to the display control device 11 by wire or wirelessly. The warning unit 114 issues a warning to the light. Then, the light may be turned on in response to the warning from the warning unit 114.

[0047] The external device also includes a speaker (not shown) connected to the display control device 11 by wire or wirelessly. The warning unit 114 warns the speaker of the occurrence of an abnormality in the screen display due to the influence of external noise on the cable. The speaker may output a sound in response to the warning. The user of the display control device 11 can know that the influence of external noise on the cable is occurring by the light in front of the store or the sound output from the speaker.

[0048] Additionally, the external device may include, for example, a mobile terminal (not shown) of a user of the display control device 11. The warning unit 114 may issue a warning to the mobile terminal when an abnormality in the screen display caused by the influence of external noise on the cable is detected. The warning from the warning unit 114 allows the user to know that an abnormality in the screen display caused by the influence of external noise on the cable has occurred.

[0049] Furthermore, the warning unit 114 may change the content of the warning depending on the comparison result. For example, the warning unit 114 may change the warning when the first comparison signal and the second comparison signal are all different from each other and when the first comparison signal and the second comparison signal are partially different from each other. When the first comparison signal and the second comparison signal are all different from each other, the screen displayed on the display device 12 is different from when the first comparison signal and the second comparison signal are partially different from each other. For example, when the first comparison signal and the second comparison signal are all different from each other, the screen of the display device 12 displays an unintended monochromatic image. On the other hand, when the first comparison signal and the second comparison signal are partially different from each other, for example, the screen of the display device 12 displays a flickering image.

[0050] Therefore, it is conceivable that the response of the user of the display control device 11 may differ depending on the screen display. For example, in the case of an unintended monochromatic display, the user needs to respond quickly, but in the case of a screen flickering display, a quick response may not be necessary. Therefore, the warning unit 114 changes the warning depending on the comparison result, so that the user of the display control device 11 can respond appropriately.

[0051] In addition, when the first comparison signal and the second comparison signal are partially different, the warning content may be changed according to the difference in the part. For example, consider a case where at a specific time, the data included in the data lines 1 to 4 of the first comparison signal and the second comparison signal are partially different, but at other times, the data included in the data lines 1 to 4 of the first comparison signal and the second comparison signal are the same. In such a case, the influence of external noise on the cable transmitting the second display signal may be temporary. Therefore, the warning unit 114 warns that the influence of noise has occurred. On the other hand, for example, when the data included in a specific data line of the first comparison signal and the second comparison signal is different for a certain period of time, the influence of external noise may occur continuously. Therefore, the warning unit 114 may warn that a measure against the external noise is necessary in addition to the occurrence of the influence of noise.

[0052] On the other hand, when comparing unit 113 compares the first comparison signal with the second comparison signal and finds no difference between the first comparison signal and the second comparison signal, warning unit 114 does not need to issue a warning. In other words, warning unit 114 does not need to issue a warning when the first comparison signal and the second comparison signal are identical.

[0053] As described above, the display control device 11 mainly includes the transmission unit 111, the branching unit 112, the comparison unit 113, and the warning unit 114. The display control device 11 may further include a conversion unit 115.

[0054] The converter 115 is one aspect of a converter that converts a DisplayPort signal into an LVDS signal. The converter 115 converts an input DisplayPort signal into an LVDS signal and outputs the LVDS signal. The LVDS signal is a low-voltage differential signal.

[0055] When the display control device 11 has the conversion unit 115, the transmission unit 111 transmits the first display signal as a DisplayPort signal. Then, the conversion unit 115 converts the first display signal received from the transmission unit 111 from the DisplayPort signal to an LVDS signal. Then, the conversion unit 115 transmits the first display signal converted into the LVDS signal to the branching unit 112.

[0056] Then, the branching unit 112 receives the first display signal converted into an LVDS signal. Then, the branching unit 112 branches the first display signal into a first comparison signal and a second display signal. Here, the first comparison signal and the second display signal are both LVDS signals. In addition, the second comparison signal is also an LVDS signal because the second display signal, which is an LVDS signal, is branched in the display device. In addition, the comparison unit 113 compares the first comparison signal and the second comparison signal, which are both LVDS signals.

[0057] Next, a description will be given of the display device 12 included in the display system 1. The display device includes a branching unit 121 and a receiving unit 122.

[0058] The branching unit 121 is one aspect of a second branching means that branches the second display signal into a second comparison signal and a third display signal. The branching unit 121 receives the second display signal from the branching unit 112 in the display control device 11. Then, the branching unit 121 branches the second display signal into a third display signal and a second comparison signal. The third display signal is transmitted to the receiving unit 122. Also, the second comparison signal is transmitted from the branching unit 121 to the comparing unit 113. Here, the third display signal and the second comparison signal branched from the second display signal are the same.

[0059] The receiving unit 122 is one aspect of a receiving means for receiving the third display signal. The receiving unit 122 receives the third display signal from the branching unit 121.

[0060] The operation of the display system 1 including the display control device 11 according to the present disclosure will be described.

[0061] 7 is a sequence diagram showing the operation of the display system 1 according to the present disclosure. In step S101, the transmission unit 111 transmits a first display signal. Then, if the display control device 11 includes the conversion unit 115, in step S102, the conversion unit 115 converts the first display signal from a DisplayPort signal to an LVDS signal. Then, in step S103, the branching unit 112 branches the first display signal into a first comparison signal and a second display signal. Then, the second display signal is transmitted from the display control device 11 to the display device 12. Also, the first comparison signal is transmitted from the branching unit 112 to the comparison unit 113.

[0062] Here, the operation of the display device 12 to which the second display signal has been transmitted will be described. First, in step S104, the branching unit 121 branches the second display signal into a second comparison signal and a third display signal. Then, the second comparison signal is transmitted to the display control device 11. On the other hand, the third display device transmits the signal to the receiving unit 122. Then, in step S205, the receiving unit 122 receives the third display signal.

[0063] The operation of the display control device 11 will be described again. In step S106, the comparison unit 113 compares the second comparison signal transmitted from the display device 12 with the first comparison signal. Then, in step S107, the warning unit 114 issues a warning based on the comparison result.

[0064] The display control device 11 in the present disclosure branches a first display signal to be displayed on the display device into a first comparison signal and a second display signal. Then, the display control device 11 compares the first comparison signal with a second comparison signal obtained by branching the second display signal in the display device. The display control device 11 issues a warning based on the comparison result between the first comparison signal and the second comparison signal. With this configuration, the display control device 11 can compare the second comparison signal, which is the same as the second display signal transmitted to the display device via the cable, with the first comparison signal. As a result, it is possible to detect an abnormality in the screen display caused by noise generated in the cable connecting the display control device 11 and the display device 12. In addition, the display control device 11 issues a warning based on the comparison result. Therefore, the user of the display control device 11 can grasp that the influence of external noise on the cable is occurring.

[0065] The display control device 11 in the present disclosure further converts the first display signal transmitted by the display port signal into an LVDS signal. In addition, in the display control device 11 in the present disclosure, the first comparison signal, the second comparison signal, and the second display signal are LVDS signals. The LVDS signal can transmit data at a low voltage. As a result, for example, high-speed data transmission or low power consumption can be realized. In addition, since the LVDS signal is a differential signal, it is also possible to reduce the influence of noise. Therefore, by converting the first display signal into an LVDS signal, high-speed data transmission, low power consumption, or reduced influence of noise can be achieved.

[0066] In the display control device 11 according to the present disclosure, the warning unit 114 issues a warning when there is a difference between the first comparison signal and the second comparison signal. When there is a difference between the first comparison signal and the second comparison signal, that is, the first display signal transmitted by the transmission unit 111 and the second display signal transmitted to the display device 12 are different. Therefore, the screen displayed on the display device 12 is different from the screen displayed by the first display signal. Therefore, in the display device 12, the screen that should be displayed by the signal from the display control device 11 is not displayed normally. One of the causes of the difference between the first comparison signal and the second comparison signal is that external noise occurs in the cable connecting the display control device 11 and the display device 12, and the display device 12 may be affected by the external noise. Therefore, the warning unit 114 issues a warning that there is a difference between the first comparison signal and the second comparison signal. As a result, the user of the display control device 11 can grasp that there is an effect due to the external noise generated in the cable.

[0067] In the display control device 11 according to the present disclosure, the warning unit 114 issues a warning when the first comparison signal and a part of the second comparison signal differ. When the first comparison signal and a part of the second comparison signal differ, for example, the screen of the display device 12 displays a flickering display. By issuing a warning when the first comparison signal and a part of the second comparison signal differ, it becomes possible to detect the above-mentioned display abnormality.

[0068] In the display control device 11 according to the present disclosure, the warning unit 114 issues a warning when all of the first comparison signal and all of the second comparison signal are different. When all of the first comparison signal and all of the second comparison signal are different, for example, the screen of the display device 12 displays an unintended monochrome color. By issuing a warning when all of the first comparison signal and all of the second comparison signal are different, it becomes possible to detect the above-mentioned display abnormality.

[0069] The display system 1 in the present disclosure includes a display control device 11 and a display device 12. The display device 12 branches the second display signal into a second comparison signal and a third display signal, and receives the third display signal. In the display device, the second display signal is branched into the second comparison signal and the third display signal, which enables the display control device 11 to compare the first comparison signal with the second comparison signal. As a result, it becomes possible to detect an abnormality in the screen display caused by noise generated in the cable connecting the display control device 11 and the display device 12.

[0070] Although the present disclosure has been described above with reference to the embodiments, the present disclosure is not limited to the above-described embodiments. Various modifications that can be understood by a person skilled in the art can be made to the configuration and details of the present disclosure within the scope of the present disclosure.

[0071] A part or all of the above-described embodiments can be described as, but not limited to, the following supplementary notes.

[0072] (Appendix 1) a transmitting means for transmitting a first display signal to be displayed on a display device; a branching means for branching the first display signal into a first comparison signal and a second display signal; A comparison means for comparing the first comparison signal with a second comparison signal obtained by branching the second display signal in the display device; a warning means for issuing a warning based on a comparison result between the first comparison signal and the second comparison signal; A display control device comprising:

[0073] (Appendix 2) A conversion means for converting a DisplayPort signal into an LVDS (Low Voltage Differential Signaling) signal is further provided, The transmitting means transmits the first display signal as the DisplayPort signal; The conversion means converts the first display signal from the DisplayPort signal to the LVDS signal. 2. A display control device as described in claim 1.

[0074] (Appendix 3) The first comparison signal, the second comparison signal, and the second indication signal are the LVDS signals. 3. A display control device according to claim 2.

[0075] (Appendix 4) The warning means issues a warning when there is a difference between the first comparison signal and the second comparison signal. 4. A display control device according to any one of claims 1 to 3.

[0076] (Appendix 5) The warning means issues a warning when the first comparison signal and a part of the second comparison signal differ from each other. 5. A display control device according to claim 4.

[0077] (Appendix 6) The warning means issues a warning when the first comparison signal and all of the second comparison signals are different. 5. A display control device according to claim 4.

[0078] (Appendix 7) a second branching means for branching the second display signal into the second comparison signal and a third display signal; a receiving means for receiving the third display signal; The display device comprising: A display control device according to any one of Supplementary Note 1 to 6; A display system including:

[0079] (Appendix 8) Transmitting a first display signal to be displayed on a display device; branching the first display signal into a first comparison signal and a second display signal; comparing the first comparison signal with a second comparison signal obtained by branching the second display signal in the display device; issuing a warning based on a comparison result between the first comparison signal and the second comparison signal; Display control method.

[0080] (Appendix 9) On the computer, Transmitting a first display signal to be displayed on a display device; branching the first display signal into a first comparison signal and a second display signal; comparing the first comparison signal with a second comparison signal obtained by branching the second display signal in the display device; issuing a warning based on a comparison result between the first comparison signal and the second comparison signal; A display control program that executes the processing. [Explanation of symbols]

[0081] 1, 2 Display system 11, 21 Display control device 111 Transmitter 112 Branch 113 Comparison Section 114 Warning section 115 Conversion unit 12, 22 Display device 121 Second Branch 122 Receiving section 211 CPU 212,221 Branch IC 213 Comparator 214 LVDS Controller 222 Receiver

Claims

1. a transmitting means for transmitting a first display signal to be displayed on a display device; a branching means for branching the first display signal into a first comparison signal and a second display signal; a comparison means for comparing the first comparison signal with a second comparison signal obtained by branching the second display signal in the display device; a warning means for warning the user when there is a difference between the first comparison signal and the second comparison signal, the warning content being changed in accordance with the difference; Equipped with The warning means issues a warning with different warning contents depending on whether the first comparison signal and the entire second comparison signal are different from each other or whether the first comparison signal and a part of the second comparison signal are different from each other. Display control device.

2. The warning means warns that an influence of external noise has occurred when a part of the first comparison signal and the second comparison signal is different at a specific time, but the difference between the first comparison signal and the second comparison signal is not present at times other than the specific time. The display control device according to claim 1 .

3. The warning means warns that an influence of external noise has occurred and that a measure against the external noise is required when the first comparison signal and the second comparison signal are partially different for a certain period of time. The display control device according to claim 1 .

4. A conversion means for converting a DisplayPort signal into an LVDS (Low Voltage Differential Signaling) signal is further provided, The transmitting means transmits the first display signal as the DisplayPort signal; The conversion means converts the first display signal from the DisplayPort signal to the LVDS signal. The display control device according to claim 1 .

5. The first comparison signal, the second comparison signal, and the second indication signal are the LVDS signals. The display control device according to claim 4.

6. a second branching means for branching the second display signal into the second comparison signal and a third display signal; a receiving means for receiving the third indication signal; The display device comprising: A display control device according to any one of claims 1 to 5, A display system including:

7. Transmitting a first display signal to be displayed on a display device; branching the first display signal into a first comparison signal and a second display signal; comparing the first comparison signal with a second comparison signal obtained by branching the second display signal in the display device; When there is a difference between the first comparison signal and the second comparison signal, different warning contents are issued depending on whether the first comparison signal and the second comparison signal are all different or whether the first comparison signal and the second comparison signal are only partially different. Display control method.

8. On the computer, Transmitting a first display signal to be displayed on a display device; branching the first display signal into a first comparison signal and a second display signal; comparing the first comparison signal with a second comparison signal obtained by branching the second display signal in the display device; When there is a difference between the first comparison signal and the second comparison signal, different warning contents are issued depending on whether the first comparison signal and the second comparison signal are all different or whether the first comparison signal and the second comparison signal are only partially different. A display control program that executes the processing.

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