Display device and driving method thereof

Abstract

A display device is disclosed. The display device includes: a display panel including a plurality of light emitting elements; at least one driver for driving the plurality of light emitting elements; a power supply device; and at least one processor identifying power-off sequence information of the at least one driver if it is detected that power supplied to the power supply device is turned off based on an output voltage of the power supply device, and controlling the at least one driver based on the identified power-off sequence information before a voltage for driving the display panel is turned off. A plurality of signals sent to at least one driver are continuously controlled to be in a low state.

Description

TECHNICAL FIELD

[0001] The disclosure relates to a display apparatus and a driving method thereof, and more particularly, to a display apparatus including a plurality of display modules and a driving method thereof. BACKGROUND

[0002] Development of display technology has also led to display apparatuses of various screen sizes. Previously, only display apparatuses of limited sizes could be produced. However, in recent years, it has become possible to produce large-screen display apparatuses, thereby breaking the limitation of display size. Accordingly, the use of large-screen display apparatuses in real life is increasing.

[0003] In particular, the use of modular display apparatuses that provide an extended display screen by combining a plurality of display modules with each other is increasing. For example, a large-screen display apparatus can include a digital signage billboard installed at a place where a large number of people pass by (e.g., a subway station, a bus stop, etc.) and displays outdoor advertisements through the display apparatus. The display screen size of the modular display apparatus can be flexibly enlarged or reduced based on the number of display modules and their combination relationship, thereby providing convenience for users who use large-screen display apparatuses. SUMMARY

[0004] TECHNICAL SOLUTION

[0005] According to one or more embodiments of the disclosure, a display apparatus is provided, including a display panel including a plurality of light emitting elements, at least one driver to drive the plurality of light emitting elements, a power supply apparatus, and at least one processor configured to, in a case where it is detected that power supplied to the power supply apparatus is turned off based on an output voltage of the power supply apparatus, identify turn-off sequence information of the at least one driver, and sequentially control a plurality of signals transmitted to the at least one driver to be in a low state based on the identified turn-off sequence information before a voltage for driving the display panel is turned off.

[0006] The at least one processor can be configured to identify whether alternating current (AC) power supplied through the power supply apparatus is turned off by detecting a power line from which direct current (DC) voltage is output.

[0007] The display panel can be a modular display panel including a plurality of display modules, and the at least one driver can include a plurality of drivers corresponding to the plurality of display modules.

[0008] The power supply apparatus can include a first power supply apparatus to supply power to a specific display module among the plurality of display modules, and a second power supply apparatus to supply power to the specific display module among the plurality of display modules, and the at least one processor can be configured to detect whether power supplied to the first power supply apparatus or the second power supply apparatus is turned off based on an output voltage of the first power supply apparatus or the second power supply apparatus.

[0009] The at least one processor can further include a detection circuit to output an identified shutdown sequence signal to the at least one driver in a case where the output voltage of the power supply apparatus decreases to reach a predetermined voltage as the power supplied to the power supply apparatus is turned off.

[0010] The detection circuit can be connected to a power detection (V sense) line terminal for detecting the output voltage of the power supply apparatus.

[0011] The detection circuit can include a first resistor connected to an output terminal of the power supply apparatus, and a second resistor having one end connected to the first resistor and the other end grounded, and identify whether the output voltage of the power supply apparatus decreases to reach a predetermined voltage based on the output terminal voltage between the first resistor and the second resistor.

[0012] The detection circuit can include a first detection circuit connected to a first power supply apparatus, a second detection circuit connected to a second power supply apparatus, and a logic circuit connected to a first output terminal of the first detection circuit and a second output terminal of the second detection circuit, the logic circuit can be implemented as an OR gate to output a low signal in a case where the voltage of the first output terminal is low and the voltage of the second output terminal is low, and the at least one processor can be configured to identify that the power supplied to the power supply apparatus has been turned off in a case where the low signal is output from the logic circuit.

[0013] The at least one processor can be configured to sequentially control a reset signal and at least one power signal sent to the at least one driver to be in a low state based on the identified shutdown sequence information.

[0014] The at least one processor can be configured to sequentially control a plurality of signals including a reset signal, at least one power signal, at least one synchronization signal, and at least one clock signal sent to the at least one driver to be in a low state based on the identified shutdown sequence information.

[0015] According to one or more embodiments of the disclosure, there is provided a driving method of a display apparatus, the method including: in a case where power supplied to a power supply apparatus is detected to be turned off based on an output voltage of the power supply apparatus, identifying shutdown sequence information of at least one driver for driving a display panel; and before a voltage for driving the display panel is turned off, sequentially controlling a plurality of signals sent to the at least one driver to be in a low state based on the identified shutdown sequence information.

[0016] In identifying the shutdown sequence information of the at least one driver, whether alternating current (AC) power supplied through the power supply apparatus is turned off can be identified by detecting a power line from which direct current (DC) voltage is output from the power supply apparatus.

[0017] According to one or more embodiments of the present disclosure, a non-transitory computer-readable medium is provided storing computer instructions that, when executed by a processor of a display device, cause the display device to perform operations, wherein the operations include: identifying shutdown sequence information for at least one driver for driving a display panel upon detecting a power shutdown of the power supply to the power supply device based on the output voltage of the power supply device; and sequentially controlling a plurality of signals sent to the at least one driver to be in a low state based on the identified shutdown sequence information before the voltage for driving the display panel is turned off. Attached Figure Description

[0018] Aspects, features, and advantages of specific embodiments of the present disclosure will become clearer from the following description provided with reference to the accompanying drawings.

[0019] Figure 1 This is an example diagram of a display device according to an embodiment of the present disclosure.

[0020] Figure 2 This is a block diagram illustrating the configuration of a display device according to one or more embodiments.

[0021] Figure 3a and Figure 3b Each of these is a block diagram illustrating a configuration of a display device according to one or more embodiments.

[0022] Figure 4 This is a diagram illustrating a driving method for a display device according to one or more embodiments.

[0023] Figures 5a to 5c These are diagrams used to illustrate implementation examples of detection circuits according to one or more embodiments.

[0024] Figure 6 This is a diagram illustrating the closing sequence operation according to one or more embodiments.

[0025] Figure 7 This is a diagram illustrating the closing sequence operation according to one or more embodiments.

[0026] Figure 8a and Figure 8b These are diagrams used to illustrate driving methods for display devices according to one or more embodiments.

[0027] Figure 9 This is a block diagram illustrating the configuration of a display device according to one or more embodiments. Detailed Implementation

[0028] The present disclosure will be described in detail below with reference to the accompanying drawings.

[0029] Considering the functionality within this disclosure, currently widely used general terms are selected as the terms used in the embodiments of this disclosure, and may be changed based on the intent of those skilled in the art, judicial precedent, the emergence of new technologies, etc. Additionally, in certain circumstances, terms may be arbitrarily chosen by the applicant. In such cases, the meanings of these terms are detailed in the corresponding descriptive sections of this disclosure. Therefore, the terms used in this disclosure need to be defined based on their meanings and throughout the content of this disclosure, rather than on their simple names.

[0030] In this disclosure, expressions such as “have,” “may have,” “include,” and “may include” indicate the presence of a corresponding feature (e.g., a value, function, operation, or component such as a part), and do not exclude the presence of additional features.

[0031] The expression "at least one of A and / or B" can mean "A or B" or "both A and B".

[0032] As used in this disclosure, terms such as "first" and "second" may refer to various components regardless of their order and / or importance. These terms are used only to distinguish one component from another and do not limit the corresponding component.

[0033] Where any component (e.g., the first component) is referred to as “(operationally or communicatively) coupled to / coupled to another component (e.g., the second component)” or “connected to another component (e.g., the second component)”, it should be understood that any component may be directly coupled to the other component or may be coupled to the other component through yet another component (e.g., the third component).

[0034] Unless otherwise expressly stated, the singular terms used herein are intended to include the plural. It should be understood that the terms “comprising,” “forming of,” etc., as used in this application specify the presence of features, numbers, steps, operations, components, parts, or combinations thereof mentioned in the specification, and do not exclude the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0035] In this disclosure, a "module" or "device" may perform at least one function or operation and may be implemented by hardware, software, or a combination of hardware and software. Furthermore, except for "modules" or "devices" that require implementation by specific hardware, multiple "modules" or multiple "devices" may be integrated into at least one module to be implemented by at least one processor (not shown).

[0036] In this disclosure, "user" may refer to a person who receives content through a display device, but is not limited thereto.

[0037] Figure 1This is an example diagram of a display device according to an embodiment of the present disclosure.

[0038] like Figure 1 As shown, the display device 100 according to one or more embodiments can be implemented by physically connecting a plurality of display modules 10 to 90 to each other. Here, each of the plurality of display modules 10 to 90 may include a plurality of light-emitting elements, such as self-emissive elements, arranged in a matrix. Specifically, the display module may be implemented as a light-emitting diode (LED) module, wherein each pixel is implemented as an LED pixel; or, the display module may be implemented as an LED cabinet, wherein a plurality of LED modules are connected to each other, but is not limited thereto. For example, the display module may be implemented as a liquid crystal display (LCD), an organic LED (OLED), an active matrix OLED (AMOLED), a plasma display panel (PDP), etc. However, for ease of explanation, it is assumed in the following description that each display module is implemented as an LED cabinet.

[0039] In one or more embodiments, the display device may be implemented as a single large display device, such as a digital signage or electronic display, or as a small display device, such as a monitor for a personal computer or a television (TV), but is not limited thereto.

[0040] Simultaneously, multiple display modules 10 to 90 can receive drive voltage from a power supply device. Specifically, the power supply device can provide a drive voltage V_LED for driving light-emitting elements (e.g., LEDs) using a driver. Therefore, when the power supply device is off, the drive voltage supplied to the display modules 10 to 90 can also be cut off, and the display modules 10 to 90 can also stop operating or be turned off.

[0041] In one example, when the AC power supplied to the power supply device is turned off, the voltage output from the power supply device can gradually decrease over time, and the output voltage of the power supply device can eventually reach zero voltage (V).

[0042] Simultaneously, each of the multiple display modules 10 to 90 can be controlled based on the operation of a single driver integrated circuit (IC). Depending on the specifications of the driver IC, a power switch sequence may be required to prevent screen transients. Here, the power switch sequence can indicate the order in which multiple signals are supplied or blocked when power is supplied or blocked.

[0043] Furthermore, as driver ICs become more complex, multiple power systems may be required, necessitating more complex power switching sequences. However, in the event of an unexpected AC power outage, failure to follow the driver IC's power switching sequence can cause screen transients.

[0044] Therefore, various embodiments will be described below, in which screen transients are prevented by detecting the output voltage of the power supply device and based on the shutdown sequence control signal of the driver IC before a shutdown occurs due to AC power shutdown.

[0045] Figure 2 This is a block diagram illustrating the configuration of a display device according to one or more embodiments.

[0046] refer to Figure 2 The display device 100 may include a display panel 110, at least one driver 120, a power supply device 130, and at least one processor 140.

[0047] Display panel 110 can be implemented as a display including self-emissive elements or a display including non-emissive elements and a backlight. For example, display panel 110 can be implemented as various types of displays, such as liquid crystal displays (LCDs), organic light-emitting diode (OLED) displays, light-emitting diode (LED) displays, micro-LED displays, miniature LED displays, plasma display panels (PDPs), quantum dot (QD) displays, and quantum dot light-emitting diode (QLED) displays. Display panel 110 may also include driving circuitry, backlight units, etc., which can be implemented in forms such as amorphous silicon thin-film transistors (TFTs), low-temperature polycrystalline silicon (LTPS) TFTs, or organic TFTs (OTFTs). In one example, a touch sensor can be disposed on the front surface of display panel 110. This touch sensor can detect touch operations and simultaneously take the form of a touch film, touch sheet, touchpad, etc., and can be implemented to detect various types of touch input. For example, display panel 110 can detect various types of touch input, such as touch input from a user's hand, touch input from an input device such as a stylus, and touch input from a specific electrostatic material. Here, the input device can be implemented as a pen-type input device, which can be referred to by various terms such as electronic pen, stylus, and S-pen. In one example, the display panel 110 can be implemented as a flat panel display, a curved display, or a foldable and / or rollable flexible display.

[0048] At least one driver 120 can drive the display panel 110 under the control of at least one processor 140. In one example, at least one driver 120 can be implemented as a driver integrated (IC) chip. For example, at least one driver 120 can drive each self-emissive element (e.g., LED pixel) included in the display panel 110 by applying a drive voltage or allowing drive current to flow under the control of the processor 140, thereby driving each LED pixel.

[0049] In one example, at least one driver 120 may each be implemented as a display driver integrated circuit (DDI) chip. For example, the DDI may include a gate IC and a source IC. The gate IC may be used to turn sub-pixels on / off, and the source IC may generate the color difference rendered by the sub-pixels. For example, each sub-pixel may be driven by using the voltage difference between the source IC and the gate IC to allow current to flow to the TFT. In some manufacturers or products, the gate IC may be embedded in the TFT (e.g., LTPS). A power supply device 130 may supply power to the display device 100. For example, the power supply device 130 may receive an AC voltage, generate a rectified direct current (DC) voltage, and supply that rectified DC voltage to the display device 100. For example, the power supply device 130 may be implemented as a DC power supply device, such as a power supply that can convert commercial power (e.g., 110V or 220V) to the voltage required in the display device 100, but is not limited thereto. The power supply may be hardware that converts AC to DC so that current can be stably used in the multiple display modules 10 to 90 and to power each system. A power supply can primarily consist of an input electromagnetic interference (EMI) filter unit, an AC-to-DC rectifier unit, a DC-to-DC switching converter unit, an output filter, and an output unit. The power supply can be implemented as, for example, a switch-mode power supply (SMPS).

[0050] At least one processor 140 can control the overall operation of the display device 100. Specifically, at least one processor 140 can be connected to each component of the display device 100 to control the overall operation of the display device 100. At least one processor 140 can be one or more processors.

[0051] At least one processor 140 can perform the operation of the display device 100 according to various embodiments by executing at least one instruction stored in the memory 170.

[0052] At least one processor 140 may include at least one of a central processing unit (CPU), a graphics processing unit (GPU), an accelerated processing unit (APU), a multi-integrated core (MIC), a digital signal processor (DSP), a neural processing unit (NPU), a hardware accelerator, or a machine learning accelerator. At least one processor 140 may control one or any combination of other components of an electronic device and perform operations related to communication or data processing. At least one processor 140 may execute at least one program or instruction stored in memory. For example, at least one processor may perform a method according to one or more embodiments of this disclosure by executing at least one instruction stored in memory.

[0053] In cases where a method according to one or more embodiments of this disclosure includes multiple operations, the multiple operations may be executed by a single processor or by multiple processors. For example, a first operation, a second operation, and a third operation may be performed by a method according to one or more embodiments. In this case, the first operation, the second operation, and the third operation may all be executed by a first processor. Alternatively, the first operation and the second operation may be executed by a first processor (e.g., a general-purpose processor), and the third operation may be executed by a second processor (e.g., a dedicated artificial intelligence processor).

[0054] At least one processor 140 may be implemented as a single-core processor containing a single core, or as at least one multi-core processor containing multiple cores (e.g., homogeneous multi-core or heterogeneous multi-core). When at least one processor 140 is implemented as a multi-core processor, each of the multiple cores included in the multi-core processor may include processor-internal memory, such as cache memory or on-chip memory, and a common cache shared by the multiple cores may be included in the multi-core processor. Furthermore, each (or some) of the multiple cores included in the multi-core processor may independently read and execute program instructions for implementing methods according to one or more embodiments of the present disclosure, or all (or some) of the multiple cores may be linked together to read and execute program instructions for implementing methods according to one or more embodiments of the present disclosure.

[0055] In cases where a method according to one or more embodiments of this disclosure includes multiple operations, these multiple operations may be executed by one core of a multi-core processor, or they may be executed by multiple cores. For example, when performing the first, second, and third operations by the method according to one or more embodiments, the first, second, and third operations may all be executed by the first core of the multi-core processor. Alternatively, the first and second operations may be executed by the first core of the multi-core processor, and the third operation may be executed by the second core of the multi-core processor.

[0056] In embodiments of this disclosure, the processor may refer to a system-on-a-chip (SoC) integrating at least one processor and other electronic components, a single-core processor, a multi-core processor, or a core included in a single-core or multi-core processor. Here, a core may be implemented as a CPU, GPU, APU, MIC, DSP, NPU, hardware accelerator, machine learning accelerator, etc. However, embodiments of this disclosure are not limited thereto. Hereinafter, for ease of description, at least one processor 140 is referred to as processor 140.

[0057] Figure 3a and Figure 3b Each of these is a block diagram illustrating a configuration of a display device according to one or more embodiments.

[0058] According to one or more embodiments, the display panel 110 may include a plurality of display modules 110-1 to 110-n. Specifically, the display panel 110 can be configured by connecting and assembling the plurality of display modules 110-1 to 110-n to each other. Here, each of the plurality of display modules may include a plurality of light-emitting pixels, such as self-emissive pixels, arranged in a matrix. In embodiments, the display panel 110 may be implemented as a plurality of LED modules (or each LED module includes at least one LED element) and / or a plurality of LED housings. In addition, an LED module may include a plurality of LED pixels. In one example, an LED pixel may be implemented as an RGB LED, and an RGB LED may include red LEDs, green LEDs, and blue LEDs.

[0059] According to one or more embodiments, at least one driver 120 may include a plurality of drivers 120-1 to 120-n connected to a plurality of display modules 110-1 to 110-n. The plurality of drivers may be configured to supply drive current to the plurality of display modules 110-1 to 110-n. The drive current may correspond to each control signal input from processor 140 as described below. For example, the plurality of drivers may output drive current by adjusting the supply time or intensity of the drive current supplied to the plurality of display modules 110-1 to 110-n to correspond to each control signal input from processor 140.

[0060] In one example, display device 100 may further include multiple converters (e.g., DC-to-DC converters). Upon receiving a DC voltage output from power supply device 130, the multiple converters can generate a DC voltage as a drive voltage for each corresponding component. A first converter among the multiple converters can convert the DC voltage input from power supply device 130 into a drive voltage V_LED supplied to the light-emitting element. For example, upon receiving a DC output voltage generated from AC power from power supply device 130, the first converter can generate a balanced and rectified DC voltage V_LED to ensure that the current supplied to the light-emitting element array is the same, and then supply this DC voltage V_LED to each light-emitting element. A second converter among the multiple converters can convert the DC voltage input from power supply device 130 into a drive voltage V_DD supplied to driver 120. Specifically, for example, upon receiving a DC output voltage generated from AC power from the power supply device 130, the second converter can generate a drive voltage V_DD for the driver 120, which is set based on the specifications of components such as internal field-effect transistors (FETs) or transistors (TRs) of the driver 120, and provide the drive voltage V_DD to each driver 120. For example, if the power supply device 130, receiving a 220V AC voltage, generates a 19V DC voltage and then provides this DC voltage to each of the first and second converters, the first converter can convert the drive voltage V_LED of the light-emitting element to a 3.8V DC voltage, and the second converter can convert the drive voltage V_DD of the driver 120 to a 3.3V DC voltage. The converters can then provide this DC voltage to the light-emitting element and the driver 120, respectively. In the following text, for ease of explanation, both the drive voltage V_LED and the drive voltage V_DD are collectively referred to as the voltage used to drive the display panel 110.

[0061] According to one or more embodiments, power supply device 130 may include a plurality of power supply devices for supplying power to a plurality of display modules 110-1 to 110-n.

[0062] according to Figure 3b In the illustrated embodiment, each of the power supply devices 130-1 to 130-n can supply power to a plurality of display modules 110-1 to 110-n. For example, the plurality of display modules 110-1 to 110-n can each be implemented as an LED cabinet, and the plurality of power supply devices 130-1 to 130-n can supply power to a corresponding LED cabinet.

[0063] In one example, multiple power devices 130-1 to 130-n may each include multiple switch-mode power supplies (SMPS). For example, as Figure 3bAs shown, the power supply device 130-1 corresponding to the first display module 110-1 among the plurality of display modules 110-1 to 110-n may include a plurality of SMPS, such as SMPS 1 and SMPS 2, and the power supply device 130-n corresponding to the nth display module 110-n may also include a plurality of SMPS, such as SMPS 1 and SMPS 2.

[0064] Figure 4 This is a diagram illustrating a driving method for a display device according to one or more embodiments.

[0065] refer to Figure 4 When the voltage supplied to power device 130 is detected to be "off" (quotes omitted below) based on the output voltage of power device 130 (S410-Y), processor 140 can identify the "off" sequence information of at least one driver 120 (S420). In one example, processor 140 and at least one driver 120 can be implemented as separate circuits (or separate chips). For example, processor 140 can be implemented as a field-programmable gate array (FPGA), and driver 120 can be implemented as a display driver integrated circuit (IC), but is not limited thereto.

[0066] In one example, the shutdown sequence may differ based on the specifications of at least one driver 120. For example, shutdown sequence information corresponding to the specifications of each driver 120 may be pre-stored in memory in the form of a lookup table or received from an external device.

[0067] In one example, processor 140 can identify whether the alternating current (AC) power supplied through power supply device 130 is off by detecting the power line that outputs a direct current (DC) voltage from power supply device 130. For example, processor 140 can identify whether the AC power is off based on the output voltage of a power sense line used to detect the output voltage of power supply device 130.

[0068] Before the power used to drive the display panel 110 is turned off, the processor 140 can sequentially control multiple signals sent to at least one driver to be in a low state based on the identified shutdown sequence information (S430).

[0069] According to one or more embodiments, the processor 140 can sequentially control the reset signal and at least one power signal sent to the driver 120 to be in a low state based on the shutdown sequence information of the driver 120.

[0070] According to one or more embodiments, the processor 140 can sequentially control multiple signals among the reset signal, at least one power signal, at least one synchronization signal, and at least one clock signal sent to the driver 120 to be in a low state based on the shutdown sequence information of the driver 120.

[0071] According to one or more embodiments, the processor 140 may further include a detection circuit for outputting an identified shutdown sequence signal to at least one driver 120 when the output voltage of the power supply device 130 decreases to a predetermined voltage as the power supplied by the power supply device 130 is turned off. In one example, the detection circuit may be connected to a power sense (Vsense) line terminal for detecting the output voltage of the power supply device 130.

[0072] According to one or more embodiments, such as Figure 3b As shown, multiple power supply devices (e.g., SMPS 1 and SMPS 2) can be configured corresponding to a display module (e.g., a cabinet). Here, if all multiple power supply devices are turned off, the processor 140 can sequentially control multiple signals sent to the driver corresponding to the corresponding display module to be in a low state based on the shutdown sequence information.

[0073] According to one or more embodiments, such as Figure 3b As shown, multiple power supply devices (e.g., SMPS 1 and SMPS 2) can be configured corresponding to a display module (e.g., a cabinet). Here, if only some of the power supply devices are turned off, the processor 140 can control the driver corresponding to the corresponding display module to make the corresponding display module operate in a low-brightness mode. In one example, the processor 140 can control the driver corresponding to the corresponding display module to make the corresponding display module operate in a low-brightness mode based on the power of the power supply devices that are on among the multiple power supply devices, the difference between the power of the power supply devices when all multiple power supply devices are on and the power of the power supply devices in the currently on state, etc.

[0074] Figures 5a to 5c These are diagrams used to illustrate implementation examples of detection circuits according to one or more embodiments.

[0075] refer to Figure 5a The detection circuit 510 may include a first resistor R1 connected to the output of the power supply device 130 and a second resistor R2 with one end connected to the first resistor R1 and the other end grounded. In one example, the output of the power supply device 130 connected to the first resistor R1 may include a power sensing (Vsense) terminal for detecting the output voltage of the power supply device 130.

[0076] In one example, processor 140 can identify whether the output voltage of power supply device 130 has dropped to a predetermined voltage based on the output voltage between the first resistor R1 and the second resistor R2.

[0077] For example, the output voltage between the first resistor R1 and the second resistor R2 can be determined based on the output voltage of the power supply device 130 and the values ​​of the first resistor R1 and the second resistor R2. The values ​​of the first resistor R1 and the second resistor R2 can be determined to have appropriate values ​​based on the output voltage of the power supply device 130. For example, if the output voltage of the power supply device 130 is 13V and the predetermined voltage is set to 1.3V, then R1 and R2 can be set to appropriate values, such as R1 / (R1+R2) = 1 / 10.

[0078] refer to Figure 5b The display device 100 may include a plurality of power supply devices 131 and 132, and a plurality of detection circuits 511 and 512 for detecting the output voltage of each of the plurality of power supply devices 131 and 132. In one example, the plurality of power supply devices 131 and 132 may be configured to power a display module.

[0079] The first detection circuit 511 may include a first resistor R1 connected to the output of the first power supply device 131, and a second resistor R2 with one end connected to the first resistor R1 and the other end grounded. In one example, the output of the first power supply device 131 connected to the first resistor R1 may include a first power sense (V sense) terminal for detecting the output voltage of the first power supply device 131.

[0080] In one example, processor 140 can identify whether the output voltage of the first power supply device 131 has dropped to a predetermined first voltage based on the output voltage between the first resistor R1 and the second resistor R2.

[0081] The second detection circuit 152 may include a third resistor R3 connected to the output of the second power supply device 132, and a fourth resistor R4 with one end connected to the third resistor R3 and the other end grounded. In one example, the output of the second power supply device 132 connected to the third resistor R3 may include a second power sense (V sense) terminal for detecting the output voltage of the second power supply device 132.

[0082] In one example, processor 140 can identify whether the output voltage of the first power supply device 132 has dropped to a predetermined second voltage based on the output voltage between the third resistor R3 and the fourth resistor R4. Here, the predetermined second voltage may be the same as or different from the predetermined first voltage. For example, the magnitudes of the predetermined first voltage and the predetermined second voltage may each be determined based on the power supplied from the first power supply device 131 and the power supplied from the second power supply device 132.

[0083] According to one or more embodiments, the first output terminal of the first detection circuit 511 and the second output terminal of the second detection circuit 152 can be connected to each other via logic circuit 530. In one example, the logic circuit can be implemented as an OR gate to output a low signal when the voltage at the first output terminal is low and the voltage at the second output terminal is low. Here, "low" can mean that the output voltage is the voltage set for each output terminal or less, or a voltage less than the set voltage. In this case, when a low signal is output from logic circuit 530, processor 140 can recognize that the power supplied to power supply device 130 has been turned off. That is, if display device 100 includes multiple power supply devices, processor 140 can only perform the above-described shutdown sequence operation when all multiple power supply devices are turned off.

[0084] According to one or more embodiments, the shutdown sequence information may include information about the order in which multiple signals provided to the driver 120 are blocked. Here, the multiple signals may include at least one of a reset signal, a power signal, a synchronization signal, and a clock signal. For example, each type of signal may include multiple signals. For instance, the power signals may include multiple signals, including a first power signal and a second power signal.

[0085] refer to Figure 5c The display device 100 may include a plurality of power supply devices 131 and 132, and a plurality of detection circuits 510 and 520 for detecting the output voltages of the plurality of power supply devices 131 and 132. In one example, the plurality of power supply devices 131 and 132 may be configured to supply power to a display module.

[0086] The first detection circuit 150 may include a first resistor R1 connected to the output of the first power supply device 131, and a second resistor R2 with one end connected to the first resistor R1 and the other end grounded. In one example, the output of the power supply device 131 connected to the first resistor R1 may include a first power sense (V sense) terminal for detecting the output voltage of the first power supply device 131.

[0087] In one example, processor 140 can identify whether the output voltage of the first power supply device 131 has dropped to a predetermined first voltage based on the output voltage between the first resistor R1 and the second resistor R2.

[0088] The second detection circuit 152 may include a third resistor R3 connected to the output of the second power supply device 132, and a fourth resistor R4 with one end connected to the third resistor R3 and the other end grounded. In one example, the output of the second power supply device 132 connected to the third resistor R3 may include a second power sense (V sense) terminal for detecting the output voltage of the second power supply device 132.

[0089] In one example, processor 140 can identify whether the output voltage of the second power supply device 132 has dropped to a predetermined second voltage based on the output voltage between the third resistor R3 and the fourth resistor R4. Here, the predetermined second voltage may be the same as or different from a predetermined first voltage. For example, the magnitudes of the predetermined first voltage and the predetermined second voltage may each be determined based on the power supplied from the first power supply device 131 and the power supplied from the second power supply device 132.

[0090] According to one or more embodiments, the first output terminal of the first detection circuit 511 and the second output terminal of the second detection circuit 152 can be connected to each other via logic circuit 540. In one example, the logic circuit can be implemented as an AND gate to output a low signal when either the voltage at the first output terminal or the voltage at the second output terminal is low. Here, "low" can mean that the output voltage is the voltage set at each output terminal or less, or a voltage less than the set voltage. In this case, if a low signal is output from logic circuit 540, processor 140 can recognize that the power supplied from either the first power supply device 131 or the second power supply device 132 has been turned off. In this case, processor 140 can control display panel 110 to operate in a low brightness mode. For example, display panel 110 can be controlled to operate a specific display module corresponding to the plurality of power supplies 131 and 132 in a low brightness mode.

[0091] In one example, with one of the power devices 131 and 132 off, processor 140 can adjust the brightness value of each area of ​​display panel 110 to a lower level based on the power of the power device that is not off. In this case, processor 140 can identify the current gain value of each sub-pixel corresponding to the adjusted brightness value and control the driver corresponding to each area of ​​display panel 110 based on the identified current gain value.

[0092] Figure 6This is a diagram illustrating the closing sequence operation according to one or more embodiments.

[0093] According to one or more embodiments, it is assumed that multiple signals (e.g., drive signal V_LED 611, clock signal SCLK 613, and data signal SIN 614) are sent to driver 120, and the shutdown sequence information of driver 120 is information used to control clock signal SCLK 613 and data signal SIN 614 to first reach a low state before drive signal V_LED 611.

[0094] In this case, if the power supply device 130 is turned off, the processor 140 can detect the signal (V sense) 612 output from the power supply device 130, thereby controlling the clock signal SCLK 613 and the data signal SIN 614 among the multiple signals 611, 613 and 614 to be in a low state before the drive signal V_LED 611 (e.g. 3.8V).

[0095] For example, although the upper side shows the signal waveform before applying the embodiments of this disclosure, where the drive signal V_LED 611 is controlled to be in a lower state instead of the clock signal SCLK 613 and the data signal SIN 614, referring to the lower side showing the signal waveform after applying the embodiments of this disclosure, the processor 140 can, upon detecting a low state of the signal (V sense) 612 output by the power supply device 130, first control the clock signal SCLK 613 and the data signal SIN 614 to be in a low state, and then control the drive signal V_LED 611 to be in a low state, so that the drive signal V_LED 611 corresponds to the shutdown sequence information of the driver 120.

[0096] Figure 7 This is a diagram illustrating the closing sequence operation according to one or more embodiments.

[0097] According to one or more embodiments, it is assumed that multiple signals (e.g., reset signal 711, first drive signal V_DD 712 and second drive signal V_LED 714) are sent to driver 120, and the shutdown sequence information of driver 120 is information for controlling the reset signal 711 to first reach a low state before the first drive signal V_DD 712 and the second drive signal V_LED 714.

[0098] In this case, if the power supply device 130 is turned off, the processor 140 can detect the signal (V sense) 713 output from the power supply device 130, thereby controlling the reset signal 711 among the multiple signals 711, 712 and 714 to be in a low state before the first drive signal V_DD 712 and the second drive signal V_LED 714.

[0099] For example, although the upper side shows the signal waveform before applying the embodiments of this disclosure, where the second drive signal V_LED 714 is controlled to be in a lower state instead of the reset signal 711, referring to the lower side showing the signal waveform after applying the embodiments of this disclosure, the processor 140 can, upon detecting a low state of the signal (V sense) 713 output by the power supply device 130, first control the reset signal 711 to be in a low state, and then control the first drive signal V_DD 712 and the second drive signal V_LED 714 to be in a low state, so that the first drive signal V_DD 712 and the second drive signal V_LED 714 correspond to the shutdown sequence information of the driver 120. That is, the processor 140 can first control the reset signal 711 to be in a low state based on the shutdown sequence information, and then control the power signals (i.e., the first drive signal V_DD 712 and the second drive signal V_LED 714) to be in a low state.

[0100] Meanwhile, the interface signals sent to driver 120 may include various signals depending on the implementation type of driver 120, such as serial peripheral interface (SPI) signals, CLK (clock) signals and low voltage differential signaling (LVDS) signals.

[0101] Figure 8a and Figure 8b These are diagrams used to illustrate driving methods for display devices according to one or more embodiments.

[0102] refer to Figure 8a The display device 100' may include a display panel 110, a driver 120, a power supply device 130, at least one processor 140, a communication interface 150, and a user interface 160. (Description omitted) Figure 8a The components shown are related to Figure 2 A detailed description of the overlapping components shown.

[0103] The communication interface 150 can be implemented as various interfaces based on the implementation example of the display device 100'. For example, the communication interface 150 can communicate with external devices, external storage media (e.g., USB memory), external servers (e.g., network drives), etc., using communication methods such as Bluetooth, Wi-Fi (i.e., wireless LAN), Zigbee, wired / wireless LAN, wide area network (WAN), Ethernet, IEEE 1394, high-definition multimedia interface (HDMI), universal serial bus (USB), mobile high-definition link (MHL), Audio Engineering Society / European Broadcasting Union (AES / EBU) communication, optical communication, or coaxial communication. In one example, the communication interface 150 can communicate with another display device, an external server, and / or a remote control device.

[0104] User interface 160 can be implemented as a device such as a button, touchpad, mouse or keyboard, or as a touch screen, and can perform manipulation input functions in addition to the display functions mentioned above.

[0105] In one example, upon receiving a power-off signal via communication interface 150 and / or user interface 160, processor 140 can sequentially control multiple signals sent to at least one driver to be in a low state based on power-off sequence information before power is turned off. For example, upon receiving a power-off remote control signal from a remote control device, processor 140 can sequentially control multiple signals sent to at least one driver to be in a low state based on power-off sequence information before power is turned off from display device 100'.

[0106] exist Figure 8b In one example shown, upon receiving a power-off signal via communication interface 150 and / or user interface 160, processor 140 can receive the power-off signal via microcontroller unit (MCU) 810. For example, a power-off remote control signal received via communication interface 150 can be processed by MCU 810 and then sent to processor 140. In this case, before shutting off power to display device 100' based on a power-off signal sent from MCU 810, processor 140 can sequentially control multiple signals sent to at least one driver to be in a low state based on power-off sequence information.

[0107] As described above, processor 140 can perform the same control operation based on the output signal of power supply device 130 and the shutdown signal received via communication interface 150 and / or user interface 160. A specific embodiment and reference [of the present invention] sequentially controls multiple signals sent to at least one driver to be in a low state based on shutdown sequence information. Figures 1 to 7 The described embodiments are the same, therefore their detailed descriptions are omitted.

[0108] Figure 9 This is a block diagram illustrating the configuration of a display device according to one or more embodiments.

[0109] refer to Figure 9 The display device 100 may include a display panel 110, a driver 120, a power supply 130, at least one processor 140, a communication interface 150, a user interface 160, a memory 170, a speaker 180, and a camera 190. (Description omitted) Figure 9 The components shown are related to Figure 2 and Figure 8a A detailed description of the overlapping components shown.

[0110] The memory 170 can store data required for various embodiments. For data storage purposes, the memory 170 can be implemented as a memory embedded in the display device 100" or as a memory removable from the display device 100". For example, data for driving the display device 100" can be stored in the memory embedded in the display device 100", while data for extended functions of the display device 100 can be stored in the memory removable from the display device 100". Meanwhile, the memory embedded in the display device 100" can be implemented as at least one of volatile memory (e.g., dynamic random access memory (DRAM), static RAM (SRAM), or synchronous dynamic RAM (SDRAM)) and non-volatile memory (e.g., one-time programmable read-only memory (OTPROM), programmable ROM (PROM), erasable programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), mask ROM or flash ROM, flash memory (e.g., NAND flash or NOR flash), hard disk drive or solid-state drive (SSD)). Additionally, the memory removable from the display device 100" may be implemented in the form of a memory card (e.g., Compact Flash (CF), Secure Digital (SD), Micro Secure Digital (Micro SD), Mini Secure Digital (Mini SD), Extreme Digital (xD), or Multimedia Card (MMC)) or an external memory that can be connected to a USB port (e.g., a USB memory).

[0111] The memory 170 can store various data required for the operation of the display device 100". For example, the memory 170 can store power on / off sequence information required for each driver IC. However, the information stored in the memory 170 may also be retrieved from an external device instead of being stored in the memory 170. For example, some information can be received in real time from an external device such as a set-top box, an external server, or a user terminal. For example, the memory 170 can store current information for multiple display modules 110-1 to 110-n. Here, the current information can be current control information based on the brightness of each sub-pixel included in the display module. Here, the current control information based on the brightness of each sub-pixel can be current control information calibrated (or modeled) based on the brightness characteristics and color shift characteristics of the current of each sub-pixel.

[0112] The speaker 180 can be a component that outputs not only various audio data but also various notification sounds, voice messages, etc. The processor 140 can control the speaker 180 to output feedback or various notifications in audio form according to various embodiments of this disclosure.

[0113] Camera 190 can be activated and perform capture based on a predetermined event. Camera 190 can convert the captured image into an electrical signal and generate image data based on the converted signal. For example, an object can be converted into an electrical image signal using a charge-coupled device (CCD), and the converted image signal can be amplified and converted into a digital signal, and then processed. For example, camera 190 can be implemented as a conventional camera, a stereo camera, or a depth camera.

[0114] Additionally, based on the implementation example of display device 100", display device 100" may also include a sensor, a microphone, a tuner, and a demodulator.

[0115] Sensors can include various types of sensors, such as touch sensors, proximity sensors, accelerometers (or gravity sensors), geomagnetic sensors, gyroscopes, pressure sensors, position sensors, distance sensors, or light sensors.

[0116] A microphone is a component used to receive user voice or other sounds and convert them into audio data. However, according to another embodiment, the display device 100" can receive user voice input from an external device via the communication interface 150.

[0117] The tuner can receive RF broadcast signals by tuning to a user-selected channel or by receiving all pre-stored channels in the radio frequency (RF) broadcast signal via an antenna.

[0118] The demodulator can receive and demodulate the digital intermediate frequency (DIF) signal converted by the tuner, and perform operations such as channel decoding.

[0119] According to the various embodiments described above, the processor 140 can detect the output voltage of the power supply device and control the signal based on the shutdown sequence of the driver IC before shutdown due to AC power shutdown, in order to prevent screen transients.

[0120] Furthermore, the methods according to the various embodiments of this disclosure described above can be implemented simply by software or hardware upgrades of conventional electronic devices.

[0121] Furthermore, the various embodiments of this disclosure described above can be executed by an embedded server located in an electronic device or a server located outside the electronic device.

[0122] Furthermore, according to embodiments of this disclosure, the various embodiments described above can be implemented in software, which includes instructions stored in a machine-readable storage medium (e.g., a computer-readable storage medium). The machine can be a device that invokes the stored instructions from the storage medium, can operate based on the invoked instructions, and may include an electronic device (e.g., electronic device A) according to embodiments of this disclosure. When the instructions are executed by a processor, the processor can directly execute them or perform the function corresponding to the instructions using other components under the processor's control. The instructions may include code provided or executed by a compiler or interpreter. The machine-readable storage medium may be provided in the form of a non-transitory storage medium. Here, the term "non-transitory" means that the storage medium is tangible, does not include signals, and does not distinguish whether data is stored semi-permanently or temporarily in the storage medium.

[0123] Additionally, according to one or more embodiments of this disclosure, the methods described in the various embodiments above can be included and provided in a computer program product. The computer program product can be traded as a product between a seller and a buyer. The computer program product can be distributed in the form of a machine-readable storage medium (e.g., a compact disc read-only memory (CD-ROM)) or through an app store (e.g., the Play Store). TM Online distribution. In the case of online distribution, at least a portion of the computer program product may be temporarily stored or provided in a storage medium, such as the manufacturer's server, the application store's server, or the memory of a relay server.

[0124] Furthermore, each component (e.g., module or program) according to the various embodiments described above may include one or more entities, and some of the corresponding sub-components may be omitted, or other sub-components may be further included in the various embodiments. Alternatively or additionally, some components (e.g., module or program) may be integrated into a single entity, and may perform the functions performed by the respective corresponding components prior to integration in the same or similar manner. The operations performed by modules, programs, or other components according to the various embodiments may be performed sequentially, in parallel, iteratively, or heuristically, and at least some operations may be performed in a different order or omitted, or other operations may be added.

[0125] Although embodiments have been shown and described in the foregoing disclosure, the disclosure is not limited to the specific embodiments described above, and various modifications can be made by those skilled in the art to which this disclosure pertains without departing from the spirit of the disclosure as claimed in the appended claims. Such modifications should also be understood to fall within the scope and spirit of this disclosure.

Claims

1. A display device (100, 100'), comprising: The display panel (110) includes multiple light-emitting elements; At least one driver (120, 120-1) is used to drive the plurality of light-emitting elements; Power supply equipment (130, 130-1, 130-n, 131, 132); as well as At least one processor (140) is configured to: When the power supply to the power devices (130, 130-1, 130-n, 131, 132) is detected to be off based on the output voltage of the power devices (130, 130-1, 130-n, 131, 132), the shutdown sequence information of the at least one driver (120, 120-1) is identified, and Before the voltage used to drive the display panel (110) is turned off, based on the identified shutdown sequence information, a plurality of signals (611, 613, 614, 711, 712, 714) sent to the at least one driver (120, 120-1) are sequentially controlled to be in a low state.

2. The device according to claim 1, wherein, The at least one processor (140) is configured to identify whether the AC power supplied by the power supply devices (130, 130-1, 130-n, 131, 132) is turned off by detecting the power lines that output DC voltage from the power supply devices (130, 130-1, 130-n, 131, 132).

3. The device according to claim 1, wherein, The display panel (110) is a modular display panel (110), which includes multiple display modules (10, ..., 90), and The at least one driver (120, 120-1) includes multiple drivers (120, 120-1) corresponding to the multiple display modules (10, ..., 90).

4. The device according to claim 3, wherein, The power supply devices (130, 130-1, 130-n, 131, 132) include: A first power supply device (131) supplies power to a specific display module (10, ..., 90) among the plurality of display modules (10, ..., 90); and The second power supply device (132) supplies power to the specific display module (10, ..., 90) among the plurality of display modules (10, ..., 90), and The at least one processor (140) is configured to detect whether the power supplied to the first power device (131) or the second power device (132) is turned off based on the output voltage of the first power device (131) or the second power device (132).

5. The device according to claim 1, wherein, The at least one processor (140) further includes detection circuitry (510, 511, 512, 520) for outputting an identified shutdown sequence signal (611, 613, 614, 711, 712, 714) to the at least one driver (120, 120-1) when the output voltage of the power supply device (130, 130-1, 130-n, 131, 132) decreases to a predetermined voltage as the power supplied from the power supply device (130, 130-1, 130-n, 131, 132) is turned off.

6. The device according to claim 5, wherein, The detection circuits (510, 511, 512, 520) are connected to the power sense (V sense) line terminals, which are used to detect the output voltage of the power supply devices (130, 130-1, 130-n, 131, 132).

7. The device according to claim 5, wherein, The detection circuit (510, 511, 512, 520) includes a first resistor connected to the output terminal of the power supply device (130, 130-1, 130-n, 131, 132), and a second resistor with one end connected to the first resistor and the other end grounded. Based on the output voltage between the first resistor and the second resistor, it is determined whether the output voltage of the power supply device (130, 130-1, 130-n, 131, 132) has decreased to the predetermined voltage.

8. The device according to claim 5, wherein, The detection circuits (510, 511, 512, 520) include: a first detection circuit (511) connected to a first power supply device (131); a second detection circuit (152) connected to a second power supply device (132); and logic circuits (530, 540) connected to a first output terminal of the first detection circuit (511) and a second output terminal of the second detection circuit (152). The logic circuits (530, 540) are implemented as OR gates, used to output low signals (611, 613, 614, 711, 712, 714) when the voltage at the first output terminal is low and the voltage at the second output terminal is low. The at least one processor (140) is configured to identify a power outage supplying the power supply devices (130, 130-1, 130-n, 131, 132) when the low signal (611, 613, 614, 711, 712, 714) is output from the logic circuit (530, 540).

9. The device according to claim 1, wherein, The at least one processor (140) is configured to sequentially control a reset signal (711) and at least one power signal (611, 613, 614, 711, 712, 714) sent to the at least one driver (120, 120-1) to be in the low state based on the identified shutdown sequence information.

10. The device according to claim 1, wherein, The at least one processor (140) is configured to sequentially control multiple signals (611, 613, 614, 711, 712, 714) among the reset signal (711), at least one power signal (611, 613, 614, 711, 712, 714), at least one synchronization signal (611, 613, 614, 711, 712, 714), and at least one clock signal (611, 613, 614, 711, 712, 714) sent to the at least one driver (120, 120-1) to be in the low state.

11. A driving method for a display device (100, 100'), the method comprising: When the power supply to the power devices (130, 130-1, 130-n, 131, 132) is turned off based on the output voltage detection of the power supply devices (130, 130-1, 130-n, 131, 132), the shutdown sequence information of at least one driver (120, 120-1) for driving the display panel (110) is identified. as well as Before the voltage used to drive the display panel (110) is turned off, based on the identified shutdown sequence information, a plurality of signals (611, 613, 614, 711, 712, 714) sent to the at least one driver (120, 120-1) are sequentially controlled to be in a low state.

12. The method according to claim 11, wherein, When identifying the shutdown sequence information of the at least one driver (120, 120-1), Whether the AC power supplied by the power supply devices (130, 130-1, 130-n, 131, 132) is turned off is identified by detecting the power lines that output DC voltage from the power supply devices (130, 130-1, 130-n, 131, 132).

13. The method according to claim 11, wherein, The display panel (110) is a modular display panel (110), which includes multiple display modules (10, ..., 90), and The at least one driver (120, 120-1) includes multiple drivers (120, 120-1) corresponding to the multiple display modules (10, ..., 90).

14. The method according to claim 11, wherein, The display device (100, 100') further includes a detection circuit (510, 511, 512, 520) for outputting an identified shutdown sequence signal (611, 613, 614, 711, 712, 714) to the at least one driver (120, 120-1) when the output voltage of the power supply device (130, 130-1, 130-n, 131, 132) decreases to a predetermined voltage as the power supplied from the power supply device (130, 130-1, 130-n, 131, 132) is turned off.

15. A non-transitory computer-readable medium storing computer instructions that, when executed by a processor (140) of a display device (100, 100'), cause the display device (100, 100') to perform operations, wherein, The operation includes: In the event that the power supplied to the power supply devices (130, 130-1, 130-n, 131, 132) is turned off based on the output voltage detection of the power supply devices (130, 130-1, 130-n, 131, 132), the shutdown sequence information of at least one driver (120, 120-1) for driving the display panel (110) is identified; and Before the voltage used to drive the display panel (110) is turned off, based on the identified shutdown sequence information, a plurality of signals (611, 613, 614, 711, 712, 714) sent to the at least one driver (120, 120-1) are sequentially controlled to be in a low state.

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