Display system and method of operating display system

Abstract

The present disclosure relates to a display system and an operation method for the display system, when a power supply device for high-brightness direct-view LED (light emitting diode) display is implemented from a plurality of normal-brightness power supply devices, display can be continued even when any one of these fails. A driver group for driving light emitting diodes (LEDs) arranged in an array on the basis of a video signal is provided with a plurality of normal luminance power supplies that supply power required for driving in a normal luminance mode, and a power switch that switches the power supply from the plurality of normal luminance power supplies to the driver group on or off. When an abnormality of the power supply is detected, the power switch is turned off and the LED is driven by switching from the high brightness mode to the normal brightness mode, and then the power switch is turned on. The invention is suitable for the LED display device.

Description

Technical Field

[0001] The present disclosure relates to a display system and a method for operating the display system, and more particularly, to a display system and a method for operating the display system, for implementing a power supply device for a high-brightness direct-view light emitting diode (LED) display by means of multiple power supply devices for normal brightness, wherein the display can continue even if any one of the multiple power supply devices for normal brightness fails. Background Art

[0002] The market for direct-view displays using light emitting diodes (LEDs) as display elements is expanding, and various technologies related to such LED displays have been proposed.

[0003] For example, a technology for suppressing the occurrence of color unevenness in a direct-view display using LEDs has been proposed (see Patent Document 1).

[0004] Reference List

[0005] Patent Literature

[0006] Patent document 1: WO 2018 / 164105 A Summary of the invention

[0007] Problems to be solved by the present invention

[0008] Furthermore, in recent years, the market for tiled displays in which a plurality of display units including LED displays are arranged in an array has expanded in direct-view displays using LEDs.

[0009] Furthermore, under such circumstances, LED displays corresponding to high brightness are being developed in order to reproduce brightness more faithfully.

[0010] In addition, since the power supply device has also been miniaturized in recent years, there is a situation where two power supply devices are installed on one display unit as a measure against increased power supply load and failure, and two measures against overload and redundancy function (a function of maintaining operation even if one of the two power supply devices fails) are implemented.

[0011] Therefore, by applying such a configuration, it is conceivable to increase the power capacity by operating two power supply devices of the display unit corresponding to normal brightness in parallel through power load distribution, and realize the power supply device of the display unit corresponding to high brightness.

[0012] However, in the case where the power supply device of the display unit corresponding to high brightness is realized by two power supply devices corresponding to normal brightness as described above, when one of the two power supply devices fails, even when the other power supply device is not failed, the display may not be able to continue due to the overload caused by the shortage of overall power.

[0013] The present disclosure is made in view of this situation, and when a power supply device for a high-brightness direct-view light emitting diode (LED) display is implemented by multiple power supply devices for normal brightness, the display can continue even if any one of the multiple power supply devices for normal brightness fails.

[0014] Solution to the problem

[0015] A display system according to one aspect of the present disclosure is a display system, comprising: a driver configured to drive a display element based on a video signal; a plurality of power supplies configured to supply power capable of driving the display element to the driver in a first brightness mode, in which the display element is driven within a first brightness range; and a driver control unit configured to control the driver so as to switch the brightness mode of the display element, wherein the driver control unit controls the driver to drive the display element in a second brightness mode, in which the display element is driven within a second brightness range at a brightness higher than the first brightness range by power supply from a plurality of power supplies, and performs control to switch from the second brightness mode to the first brightness mode, so that the driver drives the display element in the first brightness mode based on detection of an abnormality in any one of the plurality of power supplies.

[0016] A method for operating a display system according to one aspect of the present disclosure is a method for operating a display system, the display system comprising: a driver, driving a display element based on a video signal; a plurality of power supplies, providing the driver with power capable of driving the display element in a first brightness mode, wherein the display element is driven within a first brightness range, and a driver control unit, controlling the driver so as to switch the brightness mode of the display element, the method comprising: controlling the driver by the driver control unit to drive the display element in a second brightness mode, wherein the display element is driven by power from a plurality of power supplies within a second brightness range having a brightness higher than that of the first brightness range; and executing control to switch from the second brightness mode to the first brightness mode, so that the driver drives the display element in the first brightness mode based on detection of an abnormality in any one of the plurality of power supplies, wherein the driver control unit drives the display element in the second brightness mode by power from the plurality of power supplies, and executing control to switch from the second brightness mode to the first brightness mode, so that the driver drives the display element in the first brightness mode based on detection of an abnormality in any one of the plurality of power supplies.

[0017] In one aspect of the present disclosure, a display element is driven by a driver based on a video signal, power capable of driving the display element is supplied to the driver through multiple power supplies in a first brightness mode, and in the first brightness mode, the display element is driven within a first brightness range; the driver is controlled by a driver control unit to switch the brightness mode of the display element, the driver is controlled by the driver control unit to drive the display element in a second brightness mode, in the second brightness mode, the display element is driven within a second brightness range that is higher in brightness than the first brightness range through power from multiple power supplies, and the driver control unit performs control to switch from the second brightness mode to the first brightness mode, so that the driver drives the display element in the first brightness mode based on detecting an abnormality in any one of the multiple power supplies. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a diagram for describing respective power supplies for a normal-brightness display and a high-brightness display.

[0019] Figure 2 is a diagram for describing a configuration example of a display unit that implements power supply for a high-brightness display by two normal-brightness power supplies.

[0020] Figure 3 is a diagram for describing an outline of a display unit of the present disclosure.

[0021] Figure 4 is a diagram for describing a configuration example of an advantageous embodiment of a display system of the present disclosure.

[0022] Figure 5 Is used to describe Figure 4 A simplified diagram of an embodiment of a configuration of a video wall controller in FIG.

[0023] Figure 6 Is used to describe Figure 4 Schematic diagram of an embodiment of a configuration of a display unit in FIG.

[0024] Figure 7 Is used to describe Figure 4 Flowchart of display processing performed by the display system in .

[0025] Figure 8 Is used to describe Figure 4 Flowchart of the driver control processing performed by the display system in FIG.

[0026] Fig. 9 is a diagram for describing an application example of the display system of the present disclosure.

[0027] Fig.10 Is used to describe Fig. 9Flow chart of abnormal detection signal switch control processing performed by the display system in. DETAILED DESCRIPTION

[0028] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Note that in this specification and the drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant descriptions are omitted.

[0029] Hereinafter, a mode for carrying out the present technology will be described. The description will be given in the following order.

[0030] 1. Overview of the Disclosure

[0031] 2. Preferred Embodiments

[0032] 3. Application Examples

[0033] <<1. Overview of the present disclosure>>

[0034] In the case where a power supply device for a high brightness direct-view light emitting diode (LED) display is operated by a plurality of power supply devices for normal brightness, the present disclosure can continue to display even if an abnormality occurs in any of the plurality of power supply devices for normal brightness.

[0035] In recent years, the tile display market in which a plurality of display units including small LED displays are arranged in an array has expanded among direct-view displays using LEDs, and furthermore, the development of high brightness has progressed for the purpose of more accurate brightness reproduction.

[0036] More specifically, in a direct-view LED display with a dot pitch of about 10 mm used outdoors, there are several 1000 cd / m 2 High brightness model.

[0037] However, in recent years, the miniaturization of LED chips has progressed, and direct-view LED displays with a dot pitch of about 1.0 mm have rapidly expanded, and the brightness of these LED displays is about 1000 cd / m 2 .

[0038] This brightness is limited by heat dissipation, power supply capacity to be installed (power supply size), and by increasing the power supply capacity. Although it depends on the use, there are already some with a brightness of, for example, 4000 cd / m 2 or greater ultra-high brightness (greatly more than 1000cd / m 2 ) direct-view LED display.

[0039] In order to achieve high brightness of LED displays, such as Figure 1As shown in the upper part of the lower row in , for the normal brightness power supply NB required for the normal brightness display ND, a large capacity power supply LB having a capacity larger than that of the normal brightness power supply NB is required.

[0040] Right now, Figure 1 The upper part of the lower row of shows a configuration in which a large-capacity power supply LB having a capacity larger than that of a normal-brightness power supply NB supplies power to a high-brightness display HD including an LED display corresponding to high brightness.

[0041] However, as the size of the large-capacity power source LB increases, simply increasing the capacity of the power source increases the size of a housing constituting the display unit.

[0042] Furthermore, in the case where the power supply of the display unit is configured only by the large-capacity power supply LB, when a failure occurs, the high-brightness display HD cannot be continued.

[0043] Furthermore, when display units including a high brightness display HD are connected in a row (daisy chain), a signal cannot be transmitted to the display unit in a subsequent stage, and thus there is a possibility that the display unit in the subsequent stage cannot be displayed.

[0044] At the same time, because the normal brightness power supply has been reduced through recent developments, such as Figure 1 As shown in the lower part of the lower row of , it is conceivable to supply power to the high brightness display HD by increasing the capacity of the two normal brightness power supplies NB- 1 and NB- 2 .

[0045] Furthermore, for example, by increasing the capacities of the two normal brightness power supplies NB-1 and NB-2, even if an abnormality occurs in one of the two normal brightness power supplies NB, the other normal brightness power supply NB can continue displaying at normal brightness.

[0046] Note that the number of normal brightness power supplies NB may be two or more as long as it is plural. In addition, "plural normal brightness power supplies NB" may include a case where one power supply device includes a plurality of power supply areas capable of corresponding to respective operations of the normal brightness power supplies NB.

[0047] <Configuration Example Using Two Normal Brightness Power Supplies>

[0048] Figure 2 A configuration example of a display unit DU is shown which supplies power corresponding to high brightness to a driver IC group DG which drives LEDs corresponding to high brightness through two normal brightness power supplies NB-1 and NB-2.

[0049] Figure 2The display unit DU includes normal brightness power supplies NB-1 and NB-2, diodes D-1 and D-2, a driver control circuit DC, and a driver IC group DG.

[0050] Each of the normal brightness power supplies NB-1 and NB-2 is a power supply device used in a display unit including an LED display corresponding to normal brightness. The normal brightness power supplies NB-1 and NB-2 are provided with a terminal for receiving an AC input from an alternating current (AC) power supply, and are provided with power supply terminals F-1 and F-2 for supplying power to a driver control circuit DC and a driver IC group DG via diodes D-1 and D-2, respectively. In addition, the normal brightness power supplies NB-1 and NB-2 are provided with terminals G-1 and G-2 connected to a ground potential GND, respectively.

[0051] The diodes D-1 and D-2 are preferably diode circuits using metal oxide semiconductor field effect transistors (MOS-FETs) or the like because power loss increases in simple diodes.

[0052] The driver control circuit DC receives a video signal for causing each LED constituting the LED display to emit light, and drives a driver IC for causing each LED constituting the corresponding driver IC group DG to emit light.

[0053] exist Figure 2 In the display unit DU, in the case where either of the normal brightness power supplies NB-1 and NB-2 has an abnormality and does not function, diodes D-1 and D-2 separate the normal brightness power supply from the driver control circuit DC and the driver IC group DG, respectively, so that the power supply can continue within the range of normal brightness with the other power supply without an abnormality.

[0054] However, due to the simple circuit configuration, the power capacity for driving the high-brightness LED cannot be interchanged, and the power supply to the driver IC group DG (LED) is maintained at the power supply corresponding to the normal brightness.

[0055] That is, in the event of an abnormality in either one, although power redundancy can be achieved (power is supplied by only one of the two normal brightness power supplies NB in ​​the event of an abnormality in the other), power exchange corresponding to high brightness cannot be performed regardless of the abnormality.

[0056] In addition, in the case where a special balancing circuit (not shown) is added by two normal brightness power supplies to realize a large capacity corresponding to high brightness, the two normal brightness power supplies can be used as a large capacity power supply. However, since the configuration is basically equivalent to a circuit configuration in which a resistor is inserted to balance the voltage, the power loss is large. In addition, when an abnormality occurs in one of the normal brightness power supplies and power is supplied only by the other normal brightness power supply, the other normal brightness power supply needs to cover the power required for high brightness. Therefore, there is a possibility that overpower (overcurrent) occurs and the operation of the display unit stops.

[0057] Therefore, the present disclosure performs share control on two normal brightness power supplies to have the same current value and supplies power in parallel, thereby realizing power supply corresponding to high brightness.

[0058] Furthermore, the two normal brightness power supplies each have a function of detecting an abnormal operation when a fault occurs, outputting an abnormality detection signal when an abnormality is detected, and in the case where an abnormality detection signal is output from one of the two normal brightness power supplies, the power supply is temporarily stopped by disconnecting a power switch that stops the supply of power to the driver IC group DG. After the light emitting mode is switched from the high brightness mode to the normal brightness mode, the power switch is turned on to restore the power supply so that the display can continue in the normal brightness mode, thereby realizing power supply redundancy.

[0059] More specifically, if Figure 3 As shown, the display unit DU' of the present disclosure includes normal brightness power supplies NB'-1 and NB'-2, a driver control circuit DC', a driver IC group DG', and a power switch SW.

[0060] Notice, Figure 3 The normal brightness power supplies NB'-1 and NB'-2, the driver control circuit DC' and the driver IC group DG' of the display unit DU' have respective Figure 2 The normal brightness power supplies NB-1 and NB-2, the driver control circuit DC and the driver IC group DG of the display unit DU have corresponding configurations and basically have the same functions.

[0061] Right now, Figure 3 The display unit DU' and Figure 2 The display unit DU is different in that the diodes D-1 and D-2 are omitted, the power switch SW is added, and the normal brightness power supplies NB'-1 and NB'-2 are shared controlled to have the same current value and supply power in parallel to serve as power supplies corresponding to high brightness.

[0062] In addition, the normal brightness power supplies NB'-1 and NB'-2 are provided with terminals F'-1 and F'-2, respectively, and Figure 2Terminals F-1 and F-2 for supplying power of normal brightness power supplies NB-1 and NB-2 and terminals G'-1 and G'-2 corresponding to terminals G-1 and G-2 connected to the ground, and terminals E'-1 and E'-2 are newly provided for outputting abnormality detection signals.

[0063] When any abnormality is detected in each of the normal brightness power supplies NB'-1 and NB'-2, the normal brightness power supply NB'-1 or NB'-2 supplies an abnormality detection signal from the terminal E'-1 or E'-2 to the power switch SW and the driver control circuit DC'.

[0064] When an abnormal detection signal is supplied from any of the terminals E'-1 and E'-2 of the normal brightness power supplies NB'-1 and NB'-2, the power switch SW closes the connection state to stop supplying power to the driver IC group DG' from the terminals F'-1 and F'-2 of the normal brightness power supplies NB'-1 and NB'-2.

[0065] Furthermore, when receiving supply of a re-power-on signal from the driver control circuit DC' after disconnection by supply of an abnormality detection signal, the power switch SW turns on connection to resume supply of power from the terminals F'-1 and F'-2 to the driver IC group DG'.

[0066] When an abnormality detection signal is provided from either of the terminals E'-1 and E'-2 of the normal brightness power supplies NB'-1 and NB'-2, the driver control circuit DC' switches the light emission mode which is the operating mode of the light emission control of the driver IC group DG' from the high brightness mode which provides power corresponding to the high brightness to the normal brightness mode which performs light emission control with normal brightness, and then supplies a power-on signal to the power switch SW.

[0067] The light emission mode is a mode of a brightness range when the LED emits light, and includes a normal brightness mode and a high brightness mode. The high brightness mode is a mode in which light is emitted in a brightness range wider than the brightness range on the high brightness side when light emission is controlled in the normal brightness mode. Unless there is an abnormality in the normal brightness power supply, the present disclosure performs shared control so as to have the same current value output from the normal brightness power supplies NB'-1 and NB'-2, thereby realizing a large-capacity power supply, and light emission is realized in the high brightness mode.

[0068] That is, using Figure 3 In the configuration shown in the present disclosure, when an abnormal detection signal is detected from either of the two normal brightness power supplies NB'-1 and NB'-2, the power switch SW is turned off and the power supply to the driver IC group DG' is temporarily stopped to stop display.

[0069] In addition, after the emission mode is switched from the high brightness mode to the normal brightness mode by the driver control circuit DC' in the state where the display is stopped, a re-power signal is supplied to the power switch SW, and the power switch SW is turned on, so that the display in the normal brightness mode is restored.

[0070] Here, as described above, when an abnormality detection signal is detected from the terminal E'-1 or E'-2 of the normal brightness power source NB'-1 or NB'-2, the power switch SW is turned off and the power supply is stopped so that display is temporarily stopped.

[0071] However, the time period required after the driver control circuit DC' switches the light emitting mode from the high brightness mode to the normal brightness mode is about several frames, the re-power-on signal is supplied to the power switch SW, and the power switch is turned on to restore the power supply, and thereafter, the display in the normal brightness mode is restored, thereby basically continuing the display. More specifically, in the case where the frame rate is 60fps, when the period required after the power supply is stopped until the power supply is restored is about 100ms, for example, the display stops for about 6 frames, and the user can see that the display flickers for a while, but the display does not seem to stop, and the display state continues.

[0072] Thereby, the power supply can be realized in the high brightness mode while suppressing the increase in the size of the housing, and even if an abnormality occurs in any of the multiple normal brightness power supplies, the display can be continued in the normal brightness mode, and power supply redundancy is realized.

[0073] <<2. Preferred Embodiment>>

[0074] <Configuration Example of Display System>

[0075] In the case where a power supply device for a high brightness direct-view light emitting diode (LED) display is operated by a plurality of power supply devices for normal brightness, the present disclosure can continue to display even if an abnormality occurs in any of the plurality of power supply devices for normal brightness.

[0076] Figure 4 A configuration example of a display system to which the technology of the present disclosure is applied is shown.

[0077] Figure 4 The display system 11 in the display displays video contents on a large display (a tiled display) configured by arranging a plurality of display units in an array.

[0078] More specifically, the display system 11 includes a personal computer (PC) 30 , a video server 31 , a video wall controller 32 , and a video wall 33 .

[0079] The personal computer (PC) 30 is a general-purpose computer, and receives an operation input by a user and supplies a command corresponding to the operation details to the video wall controller 32. In addition, when an abnormality occurs in any of the display units 51-1 to 51-n constituting the video wall 33, the PC 30 acquires information of the occurrence of the abnormality via the video wall controller 32 and presents the information to the user.

[0080] The video server 31 includes, for example, a server computer or the like, and supplies data such as a video signal of video contents to the video wall controller 32 .

[0081] The video wall controller 32 operates in response to a command supplied from the PC 30, and distributes data of a video signal of video content among the display units 51-1 to 51-n constituting the video wall 33 to cause the display units 51-1 to 51-n to display the data.

[0082] It should be noted that, in the case where it is not necessary to individually distinguish the display units 51 - 1 to 51 - n , the display units 51 - 1 to 51 - n are simply referred to as the display unit 51 .

[0083] like Figure 4 As shown in the upper right portion of , the video wall 33 includes display units 51-1 to 51-n arranged in an array, each of the display units 51-1 to 51-n has pixels including LEDs arranged in an array, and images individually displayed by the display units 51 are combined in tiles so that one entire image is displayed on the video wall 33.

[0084] The video wall controller 32 applies predetermined signal processing to the data of the video signal of the video content provided from the video server 31, distributes and provides the data according to the arrangement of the display units 51-1 to 51-n, controls the display units 51-1 to 51-n of their respective displays, and controls the video wall 33 to display an overall image.

[0085] Note that the video wall controller 32 and the video wall 33 may be integrated with each other, or may be integrated into a display device (information processing system).

[0086] <Detailed configuration of video wall controller>

[0087] Next, we will refer to Figure 5 A detailed configuration embodiment of the video wall controller 32 is described.

[0088] The video wall controller 32 includes a local area network (LAN) terminal 71, a high-definition multimedia interface (HDMI) (registered trademark) terminal 72, a display port (DP) terminal 73, a digital video interface (DVI) terminal 74, a network interface (IF) 75, a microprocessor (MPU) 76, a signal input IF 77, a signal processing unit 78, a dynamic random access memory (DRAM) 79, a signal distribution unit 80 and signal IFs 81-1 to 81-n.

[0089] The local area network (LAN) terminal 71 is a connection terminal such as a LAN cable, and the LAN terminal 71 establishes communication with a personal computer (PC) 30 via the LAN, and the user operates the personal computer (PC) 30 to supply control commands corresponding to the details of the operation to the video wall controller 32, and supplies the input control commands to the MPU 76 via the network IF 75.

[0090] Note that the LAN terminal 71 may have a configuration suitable for physical connection with a wired LAN cable, or may have a configuration suitable for connection with a so-called wireless LAN implemented by wireless communication.

[0091] The MPU 76 receives an input of a control command supplied from the PC 30 via the LAN terminal 71 and the network IF 75 , and supplies a control signal corresponding to the received control command to the signal processing unit 78 .

[0092] The HDMI terminal 72 , DP terminal 73 , and DVI terminal 74 each serve as an input terminal for data of a video signal, and are connected to, for example, a server computer serving as the video server 31 , and supply the data of the video signal to a signal processing unit 78 via a signal input IF 77 .

[0093] Note that although Figure 2 An example of the connection of the video server 31 and the HDMI terminal 72 is shown, but any of the HDMI terminal 72, the DP terminal 73, or the DVI terminal 74 can be selected and connected as needed, because the HDMI terminal 72, the DP terminal 73, and the DVI terminal 74 have different standards but basically have similar functions. In addition, the terminal is not limited to the HDMI, DP, and DVI standards, and terminals according to standards other than the HDMI, DP, and DVI standards can be provided, and any of them can be selected and connected.

[0094] The signal processing unit 78 adjusts the color temperature, contrast, brightness, etc. of the data of the video signal supplied via the signal input IF 77 based on the control signal supplied from the MPU 76, and supplies the data to the signal distribution unit 80. At this time, the signal processing unit 78 expands the data of the video signal in the connected DRAM 79, performs signal processing according to the control signal, and supplies the signal processing result to the signal distribution section 80 as needed.

[0095] The signal distribution unit 80 distributes the data of the video signal which is subjected to the signal processing and supplied from the signal processing unit 78, and individually distributes and transmits the data to the display units 51-1 to 51-n via the signal IFs 81-1 to 81-n.

[0096] When performing signal processing based on the control signal, assuming that the lighting mode defaults to the high brightness mode, that is, the signal processing unit 78 performs signal processing to obtain a brightness range corresponding to high brightness and supplies the signal processing result to the signal distribution unit 80 .

[0097] In addition, when the video wall 33 notifies via the signal IF 81 and the signal distribution unit 80 that an abnormality is detected in the power supply of the display unit 51, the signal processing unit 78 switches the lighting mode from the high brightness mode to the normal brightness mode, performs the signal processing, and supplies the signal processing result to the signal distribution unit 80.

[0098] Furthermore, when the video wall 33 notifies that an abnormality is detected in any power supply of the display unit 51, the signal processing unit 78 supplies the notified information to the PC 30 via the MPU 76, the network IF 75, and the LAN terminal 71. At this time, the PC 30 presents to the user from the video wall 33 that an abnormality has occurred in any power supply of the display unit 51.

[0099] Note that, in the event that an abnormality occurs in all power supplies set in any one of the display units 51 of the video wall 33, display on the display unit 51 is disabled. Therefore, the PC 30 can present that the display is disabled, that is, a black screen is displayed. In addition, presentation based on the occurrence of an abnormality in the power supply can be performed by the video wall controller 32.

[0100] <Detailed configuration of display unit>

[0101] Next, we will refer to Figure 6 A detailed configuration example of the display unit 51 is described.

[0102] The display unit 51 includes an AC input 90 , a driver control circuit 91 , an LED block 92 , normal brightness power supplies 93 - 1 and 93 - 2 , and a power switch 94 .

[0103] The driver control circuit 91 is driven by the system power output provided by the terminals 93s-1 and 93s-2 of the power output from the normal brightness power supplies 93-1 and 93-2. The driver control circuit 91 supplies data of the video signal for controlling the light emission of the LEDs constituting the LED arrays 122-1 to 122-N to the plurality of LED drivers 121-1 to 121-N constituting the LED block 92.

[0104] In the absence of any output abnormality detection signal from the normal brightness power supplies 93-1 and 93-2, the driver control circuit 91 sets the light emission mode to the high brightness mode and supplies data of a video signal to a plurality of LED drivers 121-1 to 121-N constituting the LED block 92, the video signal being used to emit light of the LEDs constituting the LED arrays 122-1 to 122-N at high brightness within a wider brightness range on the brightness side higher than the normal brightness.

[0105] In the event that an abnormality detection signal is output from at least one of the normal brightness power supplies 93-1 and 93-2, the driver control circuit 91 switches the light emission mode from the high brightness mode to the normal brightness mode for emitting light having normal brightness, and provides data of a video signal for emitting light having normal brightness of the LEDs constituting the LED arrays 122-1 to 122-N to the plurality of LED drivers 121-1 to 121-N constituting the LED block 92.

[0106] In addition, in the case where an abnormality detection signal is output from at least one of the normal brightness power supplies 93-1 and 93-2, the power switch 94 controls the disconnection to stop the driving of the LED block 92. At this time, after changing the light emission mode from the high brightness mode to the normal brightness mode, the driver control circuit 91 controls the power switch 94 to be turned on to resume driving the LED block 92.

[0107] More specifically, the driver control circuit 91 includes a monitoring unit 110, a signal IF 111, a signal processing unit 112, a DRAM 113, and output IFs 114-1 to 114-N.

[0108] The signal IF 111 receives input of data of a video signal supplied from the video wall controller 32 , and supplies the data to the signal processing unit 112 .

[0109] The signal processing unit 112 corrects the color and brightness of each display unit 51 based on the data of the video signal provided from the signal IF 111, generates data for setting the luminous intensity of each LED constituting the LED arrays 122-1 to 122-N, and distributes and supplies the data to the LED drivers 121-1 to 121-N of the LED block 92 via the output IFs 114-1 to 114-N.

[0110] The LED block 92 includes LED drivers 121 - 1 to 121 -N and LED arrays 122 - 1 to 122 -N.

[0111] The LED drivers 121 - 1 to 121 -N perform control of light emission of LEDs arranged in arrays constituting the corresponding LED arrays 122 - 1 to 122 -N based on data for setting light emission intensity of the LED 141 (the data containing a video signal supplied from the driver control circuit 91 ).

[0112] The AC input 90 supplies power of an alternating current (AC) power source to each of the normal brightness power sources 93 - 1 and 93 - 2 .

[0113] Each normal brightness power supply 93-1 and 93-2 is a power supply device used in a display unit including an LED display corresponding to normal brightness, and performs sharing control so as to have the same current value output based on the AC input 90. Power is supplied to the driver control circuit 91 from each of the terminals 93s-1 and 93s-2, and power is supplied to the LED block 92 from each of the terminals 93d-1 and 93d-2 via the power switch 94.

[0114] When detecting abnormality of itself, the normal brightness power supply 93 - 1 or 93 - 2 outputs an abnormality detection signal to the driver control circuit 91 and the power switch 94 from the terminal 93 e - 1 or 93 e - 2 .

[0115] More specifically, the normal brightness power supplies 93 - 1 and 93 - 2 include abnormality detection units 131 - 1 and 131 - 2 , driver power output units 132 - 1 and 132 - 2 , and system power output units 133 - 1 and 133 - 2 , respectively.

[0116] Each of the abnormality detection units 131-1 and 131-2 monitors the power supply of the normal brightness power supply 93-1 or 93-2, as well as the temperature and the occurrence of abnormalities such as ignition, and when an abnormality is detected, outputs the abnormality detection signal as a status signal from the terminal 93e-1 or 93e-2 to the driver control circuit 91 and the power switch 94.

[0117] Each of the driver power output units 132 - 1 and 132 - 2 supplies the driver power output from the terminal 93 d - 1 or 93 d - 2 to the driver control circuit 91 via the power switch 94 .

[0118] Therefore, by the driving power output from the terminals 93d-1 and 93d-2, power is supplied to the driver control circuit 91 when the power switch 94 is turned on, and the supply of power to the driver control circuit 91 is stopped when the power switch 94 is turned off.

[0119] Each of the system power output units 133 - 1 and 133 - 2 supplies the system power output from the terminal 93 s - 1 or 93 s - 2 to the driver control circuit 91 .

[0120] Note that each normal brightness power supply 93-1 and 93-2 is a power supply device used in a display unit including an LED display corresponding to normal brightness. Therefore, in the case of using the normal brightness power supply alone, when the display unit 51 of the present disclosure is used in the normal brightness mode, sufficient power supply can be performed, but depending on the brightness level of the video signal, the power supply capacity is insufficient, and when the display unit 51 is used in the high brightness mode, there is a possibility that the display unit 51 is degraded due to overcurrent.

[0121] For example, the power switch 94 is a switch that controls on / off such as a MOS-FET, and is provided on a path connecting terminals 93d-1 and 93d-2 of normal brightness power supplies 93-1 and 93-2 and the driver control circuit 91, and the driver power output is supplied to the path.

[0122] As long as the normal state in which no abnormal detection signal is provided from terminal 93e-1 or 93e-2 continues while the power is turned on, the power switch 94 controls the connection to be on, and when an abnormal detection signal is provided from terminal 93e-1 or 93e-2 and changes to an abnormal state, the power switch 94 controls the connection to be disconnected.

[0123] The power switch 94 controls itself to be turned off, continues the off state after transitioning to the abnormal state, and thereafter controls itself to be turned on again when a re-power-on signal is supplied from the driver control circuit 91 and returns to the normal state.

[0124] The monitoring unit 110 monitors whether the abnormality detection signal is provided from the terminals 93 e - 1 and 93 e - 2 .

[0125] When an abnormality detection signal is supplied from the terminal 93 e - 1 or 93 e - 2 , the monitoring unit 110 detects the abnormal state and notifies the signal processing unit 112 that an abnormality has occurred in the normal brightness power supply 93 - 1 or 93 - 2 .

[0126] When notifying that an abnormality has occurred in the normal brightness power supply 93-1 or 93-2, the signal processing unit 112 switches the light emission mode from the high brightness mode to the normal brightness mode that emits light at normal brightness. That is, the signal processing unit 112 switches the light emission mode from the high brightness mode to the normal brightness mode and generates data when generating data for setting the light emission intensity (brightness) of each LED constituting the LED arrays 122-1 to 122-N, and distributes and supplies the data to the LED drivers 121-1 to 121-N of the LED block 92 via the output IFs 114-1 to 114-N.

[0127] That is, when an abnormal detection signal is provided from the terminal 93e-1 or 93e-2 in an abnormal state, power is not supplied from at least one of the normal brightness power supplies 93-1 and 93-2. Therefore, in the high brightness mode, when the light of the LED is to be emitted within the brightness range, there is a possibility that the light cannot be emitted due to overcurrent. Therefore, by switching the light emission mode from the high brightness mode to the normal brightness mode, the light emission intensity (brightness) is set to the brightness range of the normal brightness mode, and driving can be performed using power supplied from one normal brightness power supply 93.

[0128] The monitoring unit 110 supplies a power-on signal to the power switch 94 at a timing after the light emission mode in the signal processing unit 112 is switched from the high brightness mode to the normal brightness mode, for example, at a timing after a period of about several frames.

[0129] The power switch 94 turns on the operation based on the power-on signal from the monitoring unit 110 of the driver control circuit 91 to resume the power supply to the LED block 92 and resume the light emission of the LEDs in the LED block 92 .

[0130] At this time, the lighting of the LEDs in the LED block 92 continues in the normal brightness mode.

[0131] According to such a structure, even if an abnormality occurs in any of the normal brightness power supplies 93-1 and 93-2, the power supply to the LED block 92 is stopped by turning off the power switch 94. Therefore, even if the driver control circuit 91 controls light emission in the high brightness mode, the display unit can be prevented from being degraded due to overpower (overcurrent).

[0132] In addition, in a state where the power switch 94 is turned off and the power supply to the LED block 92 is stopped, after the light emission mode is switched from the high brightness mode to the normal brightness mode, the power switch 94 is controlled to be turned on again so that light emission continues in the normal brightness mode without overpower (overcurrent). Therefore, power redundancy can be achieved.

[0133] Furthermore, even in a configuration in which a plurality of display units 51 are connected like a daisy chain and video signals are sequentially transmitted, the risk that a video signal is not transmitted to a subsequent display unit 51 due to an overcurrent drop can be reduced.

[0134] Note that in the above description, the display unit 51 has been described as having a configuration including LED drivers 121-1 to 121-N and LED arrays 122-1 to 122-N, but the present embodiment is not limited thereto. The display unit 51 may include only one LED array 122-1 as an LED array, or may include only one LED driver 121-1 as an LED driver. In addition, the display unit 51 may not be a direct-view LED display, and may be, for example, a liquid crystal display using an LED backlight. In addition, the LEDs of the LED arrays 122-1 to 122-N may be organic LEDs (OLEDs).

[0135] <Display Processing>

[0136] Next, we will refer to Figure 7 The flowchart in Figures 4 to 6 Display processing performed by the display system 11 in.

[0137] In step S11 , the signal processing unit 78 receives input of a video signal containing content data and the like supplied from the video server 31 via any of the HDMI terminal 72 , the DP terminal 73 , or the DVI terminal 74 , and the signal input IF 77 .

[0138] In step S12 , the signal processing unit 78 converts the image format of the received image signal.

[0139] In step S13 , the signal processing unit 78 determines whether abnormality has been detected from any of the display units 51 - 1 to 51 - n , and display in the normal brightness mode has been notified via the signal distribution unit 80 and the signal IFs 81 - 1 to 81 - n .

[0140] In step S13, in the case where it is determined that abnormality is not detected from any of the display units 51-1 to 51-n and display in the normal brightness mode is not notified, the process proceeds to step S14.

[0141] In step S14, the signal processing unit 78 receives input of a control signal supplied from the MPU 76, the control signal being supplied according to the details of the operation performed on the PC 30, and performs signal processing of color temperature, contrast, brightness, and the like in the high brightness mode.

[0142] In step S17 , the signal processing unit 78 distributes and distributes the video signal subjected to the signal processing to the display units 51 - 1 to 51 - n of the video wall 33 .

[0143] In step S18 , the signal processing unit 78 transmits and outputs the distributed video signal to each of the display units 51 - 1 to 51 - n of the corresponding video wall 33 .

[0144] In step S19, it is determined whether an instruction to end the process is given. If an instruction to end the process is not given, the process returns to step S11 and the subsequent processes are repeated.

[0145] Then, in step S19, in the case where it is determined that termination has been instructed, the processing ends.

[0146] On the other hand, in step S13, in the case where it is determined that abnormality has been detected from any one of the display units 51-1 to 51-n and display in the normal brightness mode has been notified, the process proceeds to step S15.

[0147] In step S15, the signal processing unit 78 notifies the PC 30 of information indicating that an abnormality has occurred in any of the display units 51-1 to 51-n through the MPU 76, the network IF 75, and the LAN 71. Thus, the PC 30 presents information indicating that an abnormality has occurred in any of the display units 51-1 to 51-n to the user.

[0148] In step S16, the signal processing unit 78 receives input of a control signal provided from the MPU 76, the control signal being provided according to the details of the operation performed on the PC 30, and performs signal processing of color temperature, contrast, brightness, etc. in the normal brightness mode, and the processing proceeds to step S17.

[0149] In the event that no abnormality is detected in any of the display units 51-1 to 51-n through the above-mentioned series of processes, the video signal read from the video server 31 is subjected to signal processing in the high-brightness mode, and is distributed and transmitted among the display units 51-1 to 51-n constituting the video wall 33 to allow the display units 51-1 to 51-n to display the respective videos, thereby allowing the video wall 33 to display the entire video of the video content in the high-brightness mode.

[0150] Furthermore, when abnormality detection from any one of the display units 51 - 1 to 51 - n is notified, information indicating that an abnormality is detected is presented to the user of the PC 30 so that the user can recognize that an abnormality has occurred in the display unit 51 .

[0151] In addition, when detection of an abnormality is notified from any one of the display units 51-1 to 51-n, the video signal read from the video server 31 is subjected to signal processing in the normal brightness mode, and is distributed and transmitted among the display units 51-1 to 51-n constituting the video wall 33 to allow the display units 51-1 to 51-n to display the respective videos, thereby allowing the video wall 33 to display the entire video of the video content in the normal brightness mode.

[0152] That is, in this case, as will be described below, the display unit 51 in which the abnormality is detected switches the display from the high brightness mode to the normal brightness mode and displays it. While the display unit 51 without the abnormality continues the display in the high brightness mode, only the display unit 51 in which the abnormality has occurred is displayed in the normal brightness mode, and only the display of the display unit 51 in which the abnormality has occurred is dimmed.

[0153] However, in the present disclosure, when an abnormality is detected in any display unit 51, the display is switched from the high brightness mode to the normal brightness mode even in the display unit 51 without the abnormality, and all the display units 51 perform display in the normal brightness mode. Therefore, it is possible to prevent the display of only the display unit 51 where the abnormality occurs from being dimmed and continuously displayed.

[0154] Note that when an abnormality is detected in any display unit 51, the light emission pattern in the display unit 51 without the abnormality is maintained as shown below. Figure 8 Describes the driver control process in high brightness mode.

[0155] However, since the processing of the video signal in the video wall controller 32 is set to the normal brightness mode, all the video signals distributed and supplied to all the display units 51 of the video wall 33 are within the brightness range defined in the normal brightness mode.

[0156] Therefore, the light emission mode in the display unit 51 without abnormality remains in the high brightness mode, but the video signal is generated within the brightness range defined in the normal brightness mode. Therefore, the displayed image is also an image within the brightness range of the normal brightness mode, and all display units 51 display images in the normal brightness mode.

[0157] Note that a plurality of video wall controllers 32 may be used to control the video wall 33. In this case, the light emission mode may be controlled to be common among the plurality of video wall controllers 32 through communication between the video wall controllers 32 or communication via the PC 30. As a result, even in the case where the video wall 33 is controlled using a plurality of video wall controllers 32, all the display units 51 of the video wall 33 are displayed in a normal brightness mode so that the display can be continued while preventing the display of only the display unit 51 where an abnormality has occurred from being displayed darkly.

[0158] <Driver Control Processing in Display Unit>

[0159] Next, we will refer to Figure 8 The flowchart in describes the driver control processing performed in the display unit 51.

[0160] Note that this processing is based on the following assumptions: normal brightness power supplies 93-1 and 93-2 are shared and controlled, and driver power output is provided to the LED block 92 from terminals 93d-1 and 93d-2 via the power switch 94, and system power output is provided to the driver control circuit 91 from terminals 93s-1 and 93s-2 based on the AC power provided from the AC input 90.

[0161] In step S31 , the signal processing unit 112 in the driver control circuit 91 of the display unit 51 sets the light emission mode to the high brightness mode.

[0162] In step S32 , the monitoring unit 110 in the driver control circuit 91 of the display unit 51 controls the power switch 94 to be turned on.

[0163] In step S33, the monitoring unit 110 determines whether an abnormality detection signal indicating that an abnormality has occurred is supplied from at least one of the terminals 93e-1 and 93e-2 of the normal-brightness power supplies 93-1 and 93-2.

[0164] In step S33, in the case where it is determined that the abnormality detection signal is not supplied from any of the terminals 93e-1 and 93e-2 of the normal brightness power sources 93-1 and 93-2, the process proceeds to step S34.

[0165] In step S34 , the signal processing unit 112 receives input of the video signal distributed in row units by and supplied from the video wall controller 32 via the signal IF 111 .

[0166] In step S35, the signal processing unit 112 performs video signal processing of color, brightness, etc. of each display unit 51 corresponding to the video signal in the set light emission mode in units of rows allocated between the display units 51. That is, when the light emission mode is the high brightness mode, the video signal processing is performed in the high brightness mode, and when the light emission mode is the normal brightness mode, the video signal processing is performed in the normal brightness mode.

[0167] In step S36 , the signal processing unit 112 distributes the video signals to the LED drivers 121 - 1 to 121 -N of the LED block 92 in row units, and transmits the video signals via the corresponding output IFs 114 - 1 to 114 -N.

[0168] In step S37 , the LED drivers 121 - 1 to 121 -N of the LED block 92 perform LED driver control processing in line units based on the video signal, and each LED array 122 - 1 to 122 -N displays the video in line units with appropriate brightness.

[0169] In step S38, it is determined whether the end of the processing has been instructed. If the end of the processing has not been instructed, the process returns to step S33 and the subsequent processing is repeated.

[0170] Then, in step S38, when the end of the processing is instructed, the processing ends.

[0171] That is, in the case where no abnormality is detected in any of the normal brightness power supplies 93 - 1 and 93 - 2 , the LED arrays 122 - 1 to 122 -N display the video in units of lines at appropriate brightness in the high brightness mode.

[0172] On the other hand, in step S33, in the case where it is determined that abnormality is detected in any of the normal brightness power supplies 93-1 and 93-2, the process proceeds to step S39.

[0173] In step S39, the power switch 94 is disconnected according to the abnormality detection signal, and the power supply to the LED block 92 is stopped, thereby stopping the display.

[0174] In step S40, the monitoring unit 110 determines whether abnormality is detected in all of the normal-brightness power supplies 93-1 and 93-2.

[0175] In step S40, in the case where abnormality is not detected in all of the normal-brightness power supplies 93-1 and 93-2 and abnormality is detected in either one, the process proceeds to step S41.

[0176] In step S41, the monitoring unit 110 notifies the signal processing unit 112 of information indicating that an abnormality is detected. With this notification, the signal processing unit 112 sets the light emission mode to the normal brightness mode.

[0177] In step S42 , the monitoring unit 110 supplies a power-on signal to the power switch 94 , controls the power switch 94 to be turned on, restores the supply power to the LED block 92 , and restores the display.

[0178] In step S43, the signal processing unit 112 controls the signal IF 111 to notify the video wall controller 32 that there is an abnormality in some normal brightness power supplies 93 of the display unit 51, and the LED blocks 92 are displayed in the normal brightness mode, and the process returns to step S38.

[0179] That is, when an abnormality is detected in any of the normal brightness power supplies 93 - 1 and 93 - 2 , in subsequent processing, the LED arrays 122 - 1 to 122 -N display a video in a row unit with appropriate brightness in the normal brightness mode.

[0180] Furthermore, at this time, the video wall controller 32 is notified that an abnormality is detected in any of the normal brightness power supplies 93 - 1 and 93 - 2 and display is performed in the normal brightness mode, and further, the PC 30 is notified of such information through the video wall controller 32 and such information is displayed in the PC 30 .

[0181] Furthermore, in step S40, in the case where abnormality is detected in all of the normal-brightness power supplies 93-1 and 93-2, the process proceeds to step S44.

[0182] In step S44, the signal processing unit 112 controls the signal IF 111 to notify the video wall controller 32 that there is an abnormality in all normal brightness power supplies 93 of the display unit 51, stops the display of the LED block 92, and sets a black screen state, and the processing ends.

[0183] That is, when an abnormality is detected in both of the normal brightness power supplies 93 - 1 and 93 - 2 , the LED arrays 122 - 1 to 122 -N are in an unexpandable state in subsequent processing, and thus the black screen state is notified to the video wall controller 32 .

[0184] In addition, at this time, the video wall controller 32 is notified that both normal brightness power supplies 93-1 and 93-2 have detected abnormalities, stop displaying, and set a black screen state. Furthermore, this information is notified to PC 30 through the video wall controller 32 and presented in PC 30.

[0185] Through the above processing, when an abnormality is detected in either of the normal brightness power supplies 93-1 and 93-2, power supply to the LED arrays 122-1 to 122-N is stopped and display is stopped, and power is restored after the lighting mode is switched from the high brightness mode to the normal brightness mode.

[0186] Because the period from stopping to restarting the power supply is a period corresponding to the display time of several frames required to switch the lighting mode from the high brightness mode to the normal brightness mode, the display is basically stopped only for a very short period of time, and thus the display is switched to the normal brightness mode and continues.

[0187] In addition, as described above, when display is performed in the normal brightness mode, the displayed information is notified to the video wall controller 32, and in response to the notification, a video signal to be generated in the video wall controller 32 is generated in the normal brightness mode, so that the video signal is displayed in the normal brightness mode in all display units 51 including the display unit 51 in which no abnormality has occurred.

[0188] Therefore, it is possible to avoid a display state in which the display unit 51 in which an abnormality has occurred is displayed only in the normal brightness mode and thus appears darker than the display unit 51 displayed in another high brightness mode.

[0189] Furthermore, when an abnormality is detected in any display unit 51, information indicating the detected abnormality is supplied from the video wall controller 32 to the PC 30 and presented to the user, so that the user can recognize that an abnormality has been detected in the display unit 51 even if display continues in the normal brightness mode.

[0190] It should be noted that in the above configuration, an example has been described in which when an abnormality detection signal is supplied, the power switch 94 controls itself to turn off, changes the high brightness mode to the normal brightness mode, and then controls itself to turn on based on a power-on signal supplied from the monitoring unit 110.

[0191] However, the abnormality detection signal may not be supplied to the power switch 94 , and turning on or off of the power switch 94 may be controlled by the monitoring unit 110 .

[0192] That is, only the abnormal detection signal may be supplied to the monitoring unit 110 of the driver control circuit 91, and when the abnormal detection signal is detected, the monitoring unit 110 may turn off the power switch 94, and may turn on the power switch 94 again after switching the light emitting mode from the high brightness mode to the normal brightness mode. In this way, the control system of the power switch 94 may be integrated by the monitoring unit 110.

[0193] <<3. Application Examples>>

[0194] In the above description, when an abnormal detection signal is detected in either of the normal brightness power supplies 93-1 and 93-2, the power switch 94 is turned off to stop the power supply, the display mode is switched from the high brightness mode to the normal brightness mode, and then the power switch 94 is turned on to restore the power supply.

[0195] However, in the case where the display mode is the high brightness mode, even if an abnormality occurs in either of the normal brightness power supplies 93-1 and 93-2, when the video signal itself provided from the video wall controller 32 is within the brightness range displayable in the normal brightness mode, overpower (overcurrent) will not occur even if the display continues.

[0196] Therefore, even if an abnormality occurs in any of the normal brightness power supplies 93-1 and 93-2, it is not always necessary to disconnect the power switch 94 and switch the display mode from the high brightness mode to the normal brightness mode when the video signal itself is within the brightness range displayable in the normal brightness mode.

[0197] Therefore, in the case where the lighting mode is the high brightness mode, even when the video signal is within the brightness range displayable in the normal brightness mode, even if an abnormal detection signal is detected in either of the normal brightness power supplies 93-1 and 93-2, the abnormal detection signal may not be supplied to the power switch 94, and when the video signal is within the brightness range not displayable in the normal brightness mode, the abnormal detection signal may be supplied to the power switch 94.

[0198] Fig. 9 An example of a configuration of the display unit 51 is shown, in which the display unit 51 is configured not to provide an abnormal detection signal to the power switch 94 even if an abnormal detection signal is detected in either of the normal brightness power supplies 93-1 and 93-2 when the video signal is within a displayable brightness range in the normal brightness mode, and to provide an abnormal detection signal to the power switch 94 in the case of the high brightness mode when the video signal is within a brightness range that is not displayable in the normal brightness mode.

[0199] exist Fig. 9 In the display unit 51 of FIG. Figure 5 The functions of the display unit 51 are the same as those of the components, and the description thereof will be appropriately omitted.

[0200] Fig. 9 The display unit 51 and Figure 5 The display unit 51 of FIG. 1 is different in that a monitoring unit 110 ′ is provided instead of the monitoring unit 110 , and an abnormality detection signal switch 151 is newly provided.

[0201] The abnormality detection signal switch 151 is an opening / closing switch including a MOS-FET or the like, the connection / disconnection of which is controlled by the monitoring unit 110', and is a switch that switches / disconnects the connection between the terminals 93e-1 and 93e-2 of the normal brightness power supplies 93-1 and 93-2 and the power switch 94. It should be noted that the abnormality detection signal switch 151 may have a configuration other than an opening / closing switch as long as the connection / disconnection is controlled by the monitoring unit 110', and may be configured by, for example, a logic circuit.

[0202] The monitoring unit 110' has the same basic functions as the monitoring unit 110, but further determines whether the video signal supplied from the signal processing unit 112 to the LED block 92 via the output IF114-1 to 114-N is within a brightness range that can be displayed even in the normal brightness mode, and when it is determined that the video signal is within the displayable brightness range, the abnormal detection signal switch 151 is controlled to be disconnected, and when it is determined that the video signal is within the undisplayable brightness range, the abnormal detection signal switch 151 is controlled to be turned on.

[0203] According to this control, in the high brightness mode, even if an abnormality occurs in either of the normal brightness power supplies 93-1 and 93-2, when the video signal itself is within the brightness range displayable in the normal brightness mode, the abnormality detection signal is not supplied to the power switch 94. Therefore, the power supply is not stopped, and the display mode is maintained in the high brightness mode.

[0204] In addition, since the abnormality is not notified to the video wall controller 32 , the signal processing unit 78 does not need to set the image signals supplied to all the display units 51 to the normal brightness mode to perform signal processing.

[0205] <Abnormal detection signal switch control processing>

[0206] Next, see Fig.10 Flowchart Description Fig. 9 The abnormality detection signal switch control processing of the display unit 51.

[0207] In step S71 , the monitoring unit 110 ′ controls the abnormality detection signal switch 151 to be turned on.

[0208] In step S72 , the monitoring unit 110 ′ acquires the video signal in line units subjected to the video signal processing, which is to be output from the signal processing unit 112 to the output IFs 114 - 1 to 114 -N.

[0209] In step S73, the monitoring unit 110' determines whether the acquired video signal subjected to the video signal processing in units of lines is within a brightness range displayable in the normal brightness mode.

[0210] In step S73 , in the case where it is determined that the video signal is within the brightness range displayable in the normal brightness mode, the process proceeds to step S74 .

[0211] In step S74 , the monitoring unit 110 ′ sets the abnormality detection signal switch 151 to off.

[0212] On the other hand, in step S73 , in the case where it is determined that the video signal is not within the brightness range displayable in the normal brightness mode, the process proceeds to step S75 .

[0213] In step S75 , the monitoring unit 110 ′ sets the abnormality detection signal switch 151 to be turned on.

[0214] In step S76, it is determined whether the end of the process is instructed. If the end is not instructed, the process returns to step S72. That is, the processes of steps S72 to S76 are repeated until the end is instructed.

[0215] Then, in step S76, when it is determined that an instruction for the end is given, the process ends.

[0216] According to the above-described processing, in the high brightness mode, even if an abnormality occurs in either of the normal brightness power supplies 93-1 and 93-2, when the video signal itself is within the brightness range displayable in the normal brightness mode, the abnormality detection signal is not supplied to the power switch 94. Therefore, the power supply is not stopped, and the display mode can be maintained in the high brightness mode.

[0217] In addition, since the abnormality is not notified to the video wall controller 32 , the signal processing unit 78 does not need to set the image signals supplied to all the display units 51 to the normal brightness mode to perform signal processing.

[0218] Therefore, even if an abnormality occurs in either of the normal brightness power supplies 93-1 and 93-2, power supply redundancy can be achieved, and even if an abnormality occurs in the power supply in either of the display units 51, the impact on the video wall controller 32 and other display units 51 can be reduced.

[0219] Note that although an example has been described in which two normal brightness power supplies 93 are provided in one display unit 51, the number of normal brightness power supplies may be more than two. In this case, in the case where there are two or more normal brightness power supplies 93 without abnormality, the signal processing unit 112 may be used in the high brightness mode, and when the number of normal brightness power supplies 93 without abnormality becomes 1, the light emission mode is switched to the normal brightness mode to enable generation of a video signal.

[0220] It should be noted that the present disclosure may also have the following configurations.

[0221] <1> A display system, comprising:

[0222] a driver configured to drive a display element based on a video signal;

[0223] a plurality of power supplies configured to supply power capable of driving the display element to the driver in a first brightness mode in which the display element is driven within a first brightness range; and

[0224] A driver control unit is configured to control the driver to switch the brightness mode of the display element, wherein

[0225] The driver control unit controls the driver to drive the display element in a second brightness mode in which the display element is driven in a second brightness range in which brightness is higher than the first brightness range by power supply from the plurality of power sources, and

[0226] Based on detection of an abnormality in any one of the plurality of power supplies, control is performed to switch from the second brightness mode to the first brightness mode so that the driver drives the display element in the first brightness mode.

[0227] <2> according to <1> The display system also includes:

[0228] A power switch is configured to switch on or off the power supply from the plurality of power sources to the driver, wherein

[0229] The driver control unit performs control to switch from the second brightness mode to the first brightness mode so that the driver drives the display element in the first brightness mode based on detection of an abnormality of any one of the plurality of power supplies after the power switch is turned off.

[0230] <3> according to <2> A display system, wherein

[0231] The driver control unit controls the power switch to turn on, and

[0232] Based on the detection of an abnormality in any of the plurality of power supplies,

[0233] The power switch disconnects the power supply from multiple power sources to the drive, and

[0234] The driver control unit switches from the second brightness mode to the first brightness mode and performs control so that the display element is driven by the driver, and then controls the power switch to be turned on to resume power supply from the plurality of power supplies to the driver.

[0235] <4> according to <3> A display system, wherein

[0236] The driver control unit controls the driver to drive the display element in the second brightness mode based on the fact that there is no abnormality in any of the plurality of power supplies.

[0237] <5> according to <1> to <4> The display system of any one of the items, wherein

[0238] In the case where the power supply is a single unit,

[0239] In the second brightness mode, power supply of power required to drive the display element is sometimes disabled, and

[0240] In the first brightness mode, the power supply is always able to supply the power required to drive the display element.

[0241] <6> according to <1> to <5> The display system of any one of the items, wherein

[0242] The plurality of power supplies are subjected to sharing control so that the current value becomes the same, and power is supplied to the driver in parallel.

[0243] <7> according to <1> to <6> The display system of any one of the items, wherein

[0244] The plurality of power supplies includes two power supplies.

[0245] <8> according to <3> A display system, wherein

[0246] The power supply also includes an abnormality detection unit for detecting abnormalities of the power supply itself.

[0247] The abnormality detection unit outputs an abnormality detection signal based on the detection of its own abnormality, and

[0248] Based on the output of the abnormality detection signal,

[0249] The power switch disconnects the power supply from multiple power sources to the drive, and

[0250] The driver control unit controls the driver to switch the display element from the second brightness mode to the first brightness mode to drive the display element, and then controls the power switch to be turned on again.

[0251] <9> according to <8> A display system, wherein

[0252] The driver control unit controls the driver to switch the display element from the second brightness mode to the first brightness mode to drive the display element, and then transmits a power-on signal to the power switch, and

[0253] The power switch is controlled to be turned on again based on the power-on signal.

[0254] <10> according to <3> A display system, wherein

[0255] The power supply further includes an abnormality detection unit that detects an abnormality of itself and outputs an abnormality detection signal based on the detection of the abnormality of itself, and

[0256] Based on the output of the abnormality detection signal,

[0257] The driver control unit controls power supply from the plurality of power supplies of the power switch to the driver to be disconnected, then controls the driver to switch the display element from the second brightness mode to the first brightness mode to drive the display element, and controls the power switch to be turned on again.

[0258] <11> according to <3> A display system, wherein

[0259] The power supply further includes: an abnormality detection unit configured to detect an abnormality of itself and output an abnormality detection signal based on the detection of the abnormality of itself; and

[0260] an abnormality detection signal switch configured to control supply of an abnormality detection signal to the power switch supplied from the abnormality detection unit, wherein

[0261] The driver control unit controls turning on or off the abnormality detection signal switch based on brightness of a video signal generated by performing video signal processing on the video signal in a second brightness mode.

[0262] <12> according to <11> A display system, wherein

[0263] The driver control unit controls turning on or off the abnormality detection signal switch based on whether the brightness of a video signal generated by performing video signal processing on the video signal in the second brightness mode is within a first brightness range.

[0264] <13> according to <12> A display system, wherein

[0265] The driver control unit controls the abnormal detection signal switch to be turned off based on the fact that the brightness of the video signal subjected to video signal processing is within the first brightness range, the video signal is generated by performing video signal processing on the video signal in the second brightness mode, and controls the abnormal detection signal switch to be turned on based on the fact that the brightness of the video signal subjected to video signal processing is not within the first brightness range.

[0266] <14> according to <3> The display system also includes:

[0267] a plurality of display units, including a plurality of power supplies, power switches, and a driver control unit; and

[0268] A controller configured to perform video signal processing on a video signal and distribute and supply the video signal to a plurality of display units, wherein

[0269] The driver control unit notifies the controller that the abnormality is detected in any one of the plurality of power supplies based on the detection of the abnormality in any one of the plurality of power supplies.

[0270] <15> according to <14> A display system, wherein

[0271] The controller performs video signal processing on the video signal in the first brightness mode, and distributes and supplies the video signal to the plurality of display units based on a notification that an abnormality in any one of the plurality of power supplies is detected from a driver control unit of any one of the plurality of display units.

[0272] <16> according to <14> A display system, wherein

[0273] The controller outputs information indicating that an abnormality is detected in any one of the plurality of power supplies based on a notification from a driver control unit of any one of the plurality of display units that an abnormality is detected in any one of the plurality of power supplies.

[0274] <17> according to <14> A display system, wherein

[0275] The driver control unit notifies the controller of detection of abnormality in all of the plurality of power supplies and disables display based on detection of abnormality in all of the plurality of power supplies.

[0276] <18> according to <14> A display system, wherein

[0277] A plurality of display units are arranged in an array and form a video wall, and

[0278] The image formed by the video signal is displayed as one image on the entire video wall.

[0279] <19> according to <18> A display system, wherein

[0280] A first display unit included in the plurality of display units is connected to a second display unit included in the plurality of display units, and

[0281] The controller supplies the video signal to the second display unit via the first display unit.

[0282] <20> A method of operating a display system, comprising:

[0283] A driver, driving a display element based on a video signal;

[0284] a plurality of power supplies for supplying power capable of driving the display element to the driver in a first brightness mode, wherein the display element is driven within a first brightness range, and

[0285] A driver control unit controls the driver to switch the brightness mode of the display element, the method comprising:

[0286] Through the drive control unit,

[0287] controlling the driver to drive the display element in a second brightness mode, in which the display element is driven by power from a plurality of power sources in a second brightness range having a brightness higher than the first brightness range; and

[0288] Based on detecting an abnormality in any one of the plurality of power supplies, control is performed to switch from the second brightness mode to the first brightness mode so that the driver drives the display element in the first brightness mode, wherein

[0289] The driver control unit drives the display element in a second brightness mode by power from the plurality of power sources, and

[0290] Based on detection of an abnormality in any one of the plurality of power supplies, control is performed to switch from the second brightness mode to the first brightness mode so that the driver drives the display element in the first brightness mode.

[0291] Reference Symbols List

[0292] 11Display System

[0293] 30PC

[0294] 31 Video Server

[0295] 32 Video Wall Controller

[0296] 33 Video Wall

[0297] 51 and 51-1 to 51-n display units

[0298] 78 signal processing unit

[0299] 90AC input

[0300] 91 driver control circuit

[0301] 92 LED Blocks

[0302] 93, 93-1, 93-2 Normal brightness power supply

[0303] 93e-1, 93e-2, 93s-1, 93s-2, 93d-1, 93d-2 terminals

[0304] 94 Power switch

[0305] 110, 110' monitoring unit

[0306] 112 signal processing unit

[0307] 121 and 121-1 to 121-N drive circuit

[0308] 122 pixel array

[0309] 131, 131-1, 131-2 Abnormality detection unit

[0310] 132, 132-1, 132-2 driver power output

[0311] 133, 133-1, 133-2 system power output

[0312] 151 Abnormal detection signal switch

Claims

1. A display system, comprising: a driver configured to drive a display element based on a video signal; a plurality of power supplies configured to supply power capable of driving the display element to the driver in a first brightness mode in which the display element is driven within a first brightness range; as well as A driver control unit configured to control the driver to switch the brightness mode of the display element, wherein: The driver control unit controls the driver to drive the display element in a second brightness mode in which the display element is driven in a second brightness range having a brightness higher than the first brightness range by power supply from the plurality of power sources, and Based on detection of an abnormality in any one of the plurality of power supplies, control is performed to switch from the second brightness mode to the first brightness mode so that the driver drives the display element in the first brightness mode.

2. The display system according to claim 1, further comprising: a power switch configured to switch on or off the power supply from the plurality of power sources to the driver, wherein The driver control unit performs control to switch from the second brightness mode to the first brightness mode so that the driver drives the display element in the first brightness mode after turning off the power switch based on detection of abnormality of any one of the plurality of power supplies.

3. The display system according to claim 2, wherein: The driver control unit controls the power switch to turn on, and Based on detecting an abnormality in any one of the plurality of power supplies, The power switch disconnects the power supply from the plurality of power sources to the driver, and The driver control unit switches from the second brightness mode to the first brightness mode and performs control so that the display element is driven by the driver, and then controls the power switch to be turned on to resume power supply from the plurality of power supplies to the driver.

4. The display system according to claim 3, wherein The driver control unit controls the driver to drive the display element in the second brightness mode based on the fact that there is no abnormality in any one of the plurality of power supplies.

5. The display system according to claim 1, wherein: Where the power supply is a single unit, In the second brightness mode, a power supply for power required to drive the display element is sometimes disabled, and In the first brightness mode, a power source capable of always supplying power required to drive the display element.

6. The display system according to claim 1, wherein: The plurality of power supplies are subjected to sharing control so that current values ​​become the same, and power is supplied to the driver in parallel.

7. The display system according to claim 1, wherein: The plurality of power supplies includes two power supplies.

8. The display system according to claim 3, wherein: The power supply further includes an abnormality detection unit for detecting abnormalities of the power supply itself. The abnormality detection unit outputs an abnormality detection signal based on the detection of the own abnormality, and Based on the output of the abnormality detection signal, The power switch disconnects the power supply from the plurality of power sources to the driver, and The driver control unit controls the driver to switch the display element from the second brightness mode to the first brightness mode to drive the display element, and then controls the power switch to be turned on again.

9. The display system according to claim 8, wherein: The driver control unit controls the driver to switch the display element from the second brightness mode to the first brightness mode to drive the display element, and then transmits a power-on signal to the power switch, and The power switch is controlled to be turned on again based on the power-on signal.

10. The display system according to claim 3, wherein: The power supply further includes an abnormality detection unit that detects an abnormality of itself and outputs an abnormality detection signal based on the detection of the abnormality of itself, and Based on the output of the abnormality detection signal, The driver control unit controls the disconnection of power supply from multiple power supplies of the power switch to the driver, then controls the driver to switch the display element from the second brightness mode to the first brightness mode to drive the display element, and controls the power switch to be turned on again.

11. The display system according to claim 3, wherein: The power supply further includes: an abnormality detection unit configured to detect an abnormality of itself and output an abnormality detection signal based on the detection of the abnormality of itself; and an abnormality detection signal switch configured to control supply of the abnormality detection signal supplied from the abnormality detection unit to the power switch, and The driver control unit controls turning on or off the abnormality detection signal switch based on brightness of the video signal subjected to video signal processing generated by performing the video signal processing on the video signal in the second brightness mode.

12. The display system according to claim 11, wherein: The driver control unit controls turning on or off the abnormality detection signal switch based on whether the brightness of the video signal subjected to video signal processing generated by performing the video signal processing on the video signal in the second brightness mode is within the first brightness range.

13. The display system according to claim 12, wherein: The driver control unit controls the abnormal detection signal switch to be turned off based on the fact that the brightness of the video signal subjected to video signal processing is within the first brightness range, and the video signal is generated by performing the video signal processing on the video signal in the second brightness mode, and the driver control unit controls the abnormal detection signal switch to be turned on based on the fact that the brightness of the video signal subjected to video signal processing is not within the first brightness range.

14. The display system according to claim 3, further comprising: a plurality of display units, comprising the plurality of power supplies, the power switches and the driver control unit; as well as a controller configured to perform the video signal processing on the video signal and distribute and supply the video signal to the plurality of display units, wherein The driver control unit notifies the controller of detection of the abnormality in any one of the plurality of power supplies based on detection of the abnormality in any one of the plurality of power supplies.

15. The display system according to claim 14, wherein: The controller performs the video signal processing on the video signal in the first brightness mode based on the notification from the driver control unit of any of the plurality of display units that the abnormality is detected in any of the plurality of power supplies, and distributes and supplies the video signal to the plurality of display units.

16. The display system according to claim 14, wherein: The controller outputs information indicating that the abnormality is detected in any one of the plurality of power supplies based on the notification from the driver control unit of any one of the plurality of display units that the abnormality is detected in any one of the plurality of power supplies.

17. The display system according to claim 14, wherein: The driver control unit notifies the controller of detection of the abnormality in all of the plurality of power supplies and disables display based on detection of the abnormality in all of the plurality of power supplies.

18. The display system according to claim 14, wherein: The plurality of display units are arranged in an array and constitute a video wall, and The image formed by the video signal is displayed as one image on the entire video wall.

19. The display system according to claim 18, wherein: A first display unit included in the plurality of display units is connected to a second display unit included in the plurality of display units, and The controller supplies the video signal to the second display unit via the first display unit.

20. A method of operating a display system, the display system comprising: A driver, driving a display element based on a video signal; a plurality of power supplies for supplying power capable of driving the display element to the driver in a first brightness mode, in which the display element is driven within a first brightness range, and A driver control unit controls the driver to switch the brightness mode of the display element, the method comprising: By the driver control unit, controlling the driver to drive the display element in a second brightness mode in which the display element is driven in a second brightness range having a brightness higher than the first brightness range by power supply from the plurality of power sources; and Based on detection of an abnormality in any one of the plurality of power supplies, control is performed to switch from the second brightness mode to the first brightness mode so that the driver drives the display element in the first brightness mode, wherein, The driver control unit drives the display element in the second brightness mode by power supply from the plurality of power sources, and Based on detection of an abnormality in any one of the plurality of power supplies, control is performed to switch from the second brightness mode to the first brightness mode so that the driver drives the display element in the first brightness mode.

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