Display device and method for driving same

Abstract

A display device is disclosed. The display device comprises: 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 which identifies power-off sequence information of the at least one driver if it is detected, on the basis of an output voltage of the power supply device, that power supplied to the power supply device is turned off, and on the basis of the identified power-off sequence information, successively controls a plurality of signals transmitted to the at least one driver to a low state before the voltage for driving the display panel is shut down.

Description

How to drive a display device

[0001] The present disclosure relates to a display device and a driving method thereof, and more particularly, to a display device comprising a plurality of display modules and a driving method thereof.

[0002] Advances in display technology have also diversified the screen sizes of display devices. While previously limited display sizes were possible, recent developments have enabled the production of large-screen displays, transcending the limitations of conventional display sizes.12 Consequently, the use of large-screen displays is increasing in everyday life.

[0003] In particular, the use of modular display devices, which combine multiple display modules to provide an expanded display screen, is on the rise. For example, large-screen display devices are installed in high-traffic areas such as subway stations and bus stops, and are used to display outdoor advertisements. Modular display devices can flexibly expand or contract the size of the display screen depending on the number of display modules and their combination, providing convenience to users of large-screen display devices.

[0004] A display device according to one or more embodiments 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, and at least one processor for identifying power-off sequence information of the at least one driver when power supplied to the power supply is detected to be off based on an output voltage of the power supply, and sequentially controlling a plurality of signals transmitted to the at least one driver to a low state based on the identified power-off sequence information before a voltage for driving the display panel is shut down.

[0005] According to one example, the one or more processors can detect a power line from which a DC (Direct current) voltage is output from the power supply to identify whether an AC (Alternating current) power supplied through the power supply is turned off.

[0006] According to one example, the display panel is a modular display panel including a plurality of display modules, and the at least one driver may include a plurality of drivers corresponding to the plurality of display modules.

[0007] According to one example, the power supply device includes a first power supply device that supplies power to a specific display module among the plurality of display modules and a second power supply device that supplies power to the specific display module among the plurality of display modules, and the one or more processors can detect whether power supplied to the first power supply device and the second power supply device is turned off based on output voltages of the first power supply device and the second power supply device.

[0008] According to one example, the device may further include a detection circuit for outputting the identified off sequence signal to the at least one driver when the output voltage of the power supply device decreases and reaches a preset voltage as the power supplied from the power supply device is turned off.

[0009] According to one example, the sensing circuit may be connected to a power sense line terminal (V sense) that senses the output voltage of the power supply.

[0010] According to one example, the detection circuit includes a first resistor connected to an output terminal of the power supply and a second resistor having one end connected to the first resistor and the other end grounded, and can identify whether the output voltage of the power supply is reduced to reach a preset voltage based on an output terminal voltage between the first resistor and the second resistor.

[0011] According to one example, the detection circuit may include a first detection circuit connected to a first power supply, a second detection circuit connected to a second power supply, 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 may be implemented as an OR gate that outputs a low signal when a voltage of the first output terminal is low and a voltage of the second output terminal is low. The one or more processors may identify that power supplied to the power supply is turned off when a low signal is output from the logic circuit.

[0012] According to one example, the one or more processors can sequentially control a reset signal and at least one power signal transmitted to the at least one driver to a low state based on the identified off-sequence information.

[0013] According to one example, the one or more processors can sequentially control a plurality of signals among a reset signal, at least one power signal, at least one sync signal, and at least one clock signal transmitted to the at least one driver to a low state based on the identified off-sequence information.

[0014] A method for driving a display device according to one or more embodiments may include a step of identifying power-off sequence information of at least one driver for driving a display panel when power supplied to the power supply device is detected to be off based on an output voltage of the power supply device, and a step of sequentially controlling a plurality of signals transmitted to the at least one driver to a low state based on the identified power-off sequence information before the voltage for driving the display panel is shut down.

[0015] According to one example, the step of identifying power-off sequence information of the at least one driver may detect a power line from which a DC (Direct current) voltage is output from the power supply device to identify whether an AC (Alternating current) power supplied through the power supply device is turned off.

[0016] A non-transitory computer-readable medium storing computer instructions that, when executed by a processor of a display device according to one or more embodiments, cause the electronic device to perform an operation, the operation may include: when power supplied to the power supply device is detected to be off based on an output voltage of the power supply device, identifying power-off sequence information of at least one driver for driving a display panel; and sequentially controlling a plurality of signals transmitted to the at least one driver to a low state based on the identified power-off sequence information before the voltage for driving the display panel is shut down.

[0017] Aspects, features and advantages of specific embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings.

[0018] FIG. 1 is an exemplary diagram of a display device according to one embodiment of the present disclosure.

[0019] FIG. 2 is a block diagram illustrating a configuration of a display device according to one or more embodiments.

[0020] FIGS. 3A and 3B are block diagrams specifically illustrating the configuration of a display device according to one or more embodiments.

[0021] FIG. 4 is a drawing for explaining a method of driving a display device according to one or more embodiments.

[0022] FIGS. 5A to 5C are drawings illustrating implementation examples of a detection circuit according to one or more embodiments.

[0023] FIG. 6 is a diagram illustrating a power off sequence operation according to one or more embodiments.

[0024] FIG. 7 is a diagram illustrating a power off sequence operation according to one or more embodiments.

[0025] FIGS. 8A and 8B are drawings for explaining a method of driving a display device according to one or more embodiments.

[0026] FIG. 9 is a block diagram specifically illustrating a configuration of a display device according to one or more embodiments.

[0027] Hereinafter, the present disclosure will be described in detail with reference to the attached drawings.

[0028] The terms used in the embodiments of this disclosure have been selected from widely used, current terms, taking into account the functions of this disclosure. However, these terms may vary depending on the intentions of those skilled in the art, precedents, the emergence of new technologies, etc. Furthermore, in certain cases, terms may be arbitrarily selected by the applicant, and in such cases, their meanings will be described in detail in the description of the relevant disclosure. Therefore, the terms used in this disclosure should not be defined simply as names of terms, but rather based on the meanings of the terms and the overall content of this disclosure.

[0029] In this disclosure, expressions such as “has,” “can have,” “includes,” or “may include” indicate the presence of a corresponding feature (e.g., a component such as a number, function, operation, or part), and do not exclude the presence of additional features.

[0030] The expression "at least one of A and / or B" should be understood to mean either "A" or "B" or "A and B".

[0031] The expressions “first,” “second,” “first,” or “second,” etc., used in this disclosure can describe various components, regardless of order and / or importance, and are only used to distinguish one component from another, but do not limit the components.

[0032] When it is said that a component (e.g., a first component) is “(operatively or communicatively) coupled with / to” or “connected to” another component (e.g., a second component), it should be understood that the component may be directly coupled to the other component, or may be connected through another component (e.g., a third component).

[0033] Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as "comprise" or "consist of" are intended to indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but should be understood not to preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0034] In the present disclosure, a "module" or "part" performs at least one function or operation and may be implemented as hardware or software, or as a combination of hardware and software. Furthermore, multiple "modules" or multiple "parts" may be integrated into at least one module and implemented as at least one processor (not shown), excluding any "modules" or "parts" that need to be implemented as specific hardware.

[0035] In this disclosure, a 'user' may mean, but is not limited to, a person who receives content through a display device.

[0036] FIG. 1 is an exemplary diagram of a display device according to one embodiment of the present disclosure.

[0037] As illustrated in FIG. 1, a display device (100) according to one or more embodiments may be implemented in a form in which a plurality of display modules (10 to 90) are physically connected. Here, each of the plurality of display modules (10 to 90) may include a plurality of light-emitting elements, for example, self-luminous elements, arranged in a matrix form. In particular, the display module may be implemented as an LED module in which each of a plurality of pixels is implemented as an LED pixel, or an LED cabinet in which a plurality of LED modules are connected, but is not limited thereto. For example, the display module may be implemented as an LCD (liquid crystal display), an OLED (organic LED), an AMOLED (active-matrix OLED), a PDP (Plasma Display Panel), etc. However, for the convenience of explanation, the following description will assume a case in which each of the display modules is implemented as an LED cabinet.

[0038] According to one or more embodiments, it may be implemented as a single large display device such as a digital signage, an electronic display, or the like, or a small display device such as a monitor for a personal computer, a TV, or the like, but is not limited thereto.

[0039] Meanwhile, a plurality of display modules (10 to 90) receive a driving voltage from a power supply. Specifically, the power supply provides a driving voltage (V_LED) for driving a light-emitting element (e.g., an LED) as a driver. Therefore, when the power supply is turned off, the driving voltage provided to the display modules (10 to 90) is also cut off, so that the display modules (10 to 90) also stop operating or are turned off.

[0040] For example, when the AC power supplied to the power supply is turned off, the voltage output from the power supply gradually decreases over time, ultimately reaching 0V (Voltage) at the output of the power supply.

[0041] Meanwhile, multiple display modules (10 to 90) can be controlled by driving individual driver ICs. Depending on the driver IC specifications, a power ON / OFF sequence is required to prevent screen overheating. Here, the power ON / OFF sequence may refer to the order in which multiple signals are provided or blocked when power is supplied or blocked.

[0042] In addition, as the function of the driver IC becomes more complex, it requires multiple power systems, and accordingly, an increasingly complex power ON / OFF sequence is required. However, if the power ON / OFF sequence of the driver IC is not maintained in an unexpected AC power-off situation, screen overheating may occur.

[0043] Accordingly, the following describes various embodiments of detecting the output voltage of a power supply and controlling a signal according to the off sequence of a driver IC before a shutdown due to an AC power off to prevent screen overshoot.

[0044] FIG. 2 is a block diagram illustrating a configuration of a display device according to one or more embodiments.

[0045] According to FIG. 2, the display device (100) may include a display panel (110), at least one driver (120), a power supply (130), and one or more processors (140).

[0046] The display panel (110) may be implemented as a display including a self-luminous element or a display including a non-luminous element and a backlight. For example, it may be implemented as various types of displays such as an LCD (Liquid Crystal Display), an OLED (Organic Light Emitting Diodes) display, an LED (Light Emitting Diodes), a micro LED, a Mini LED, a PDP (Plasma Display Panel), a QD (Quantum dot) display, a QLED (Quantum dot light-emitting diodes), etc. The display panel (110) may also include a driving circuit, a backlight unit, etc., which may be implemented in a form such as an a-si TFT, an LTPS (low temperature poly silicon) TFT, an OTFT (organic TFT), etc. According to an example, a touch sensor that detects a touch operation in the form of a touch film, a touch sheet, a touch pad, etc. may be disposed on the front of the display panel (110), so as to be implemented so as to detect various types of touch inputs. For example, the display panel (110) can detect various types of touch inputs, such as a touch input by a user's hand, a touch input by an input device such as a stylus pen, and a touch input by a specific electrostatic material. Here, the input device can be implemented as a pen-type input device that can be referred to by various terms such as an electronic pen, a stylus pen, an S-pen, etc. According to an example, the display panel (110) can be implemented as a flat display, a curved display, a flexible display that can be folded or / and rolled, etc.

[0047] At least one driver (120) drives the display panel (110) under the control of one or more processors (140). In one example, at least one driver (120) may be implemented as a driver IC (integrated chip). For example, at least one driver (120) may drive each self-luminous element, for example, an LED pixel, constituting the display panel (110) by applying a driving voltage or flowing a driving current under the control of the processor (140), thereby driving each LED pixel.

[0048] According to an example, each of at least one driver (120) may be implemented as a DDI (Display Driver IC (Integrated Circuit) chip. For example, the DDI may include a Gate IC and a Source IC. The Gate IC is responsible for turning on / off the sub-pixels, and the Source IC may generate a difference in color to be expressed by the sub-pixels. For example, the voltage difference between the Source IC and the Gate IC may be used to supply current to the TFT so that each sub-pixel may be driven. Depending on some manufacturers or products, the Gate IC may be built into the TFT (LTPS). The power supply (130) may supply power to the display device (100). For example, the power supply (130) may receive AC voltage, generate a rectified DC voltage, and supply the rectified DC voltage to the display device (100). For example, the power supply (130) may be a DC power supply that converts commercial power such as 110 V or 220 V into a voltage required inside the display device (100), for example, a power It can be implemented as a power supply, but is not limited thereto. The power supply is a hardware that converts AC current into DC current so that it can be stably used in each of a plurality of display modules (10 to 90) and supplies power to each system accordingly. The power supply can be largely composed of an input electromagnetic interference (EMI) filter, an AC-DC rectifier, a DC-DC switching converter, an output filter, and an output section. The power supply can be implemented as, for example, a switched mode power supply (SMPS).

[0049] One or more processors (140) control the overall operation of the display device (100). Specifically, one or more processors (140) are connected to each component of the display device (100) and can control the overall operation of the display device (100). The one or more processors (140) may be composed of one or more processors.

[0050] One or more processors (140) can perform operations of the display device (100) according to various embodiments by executing at least one instruction stored in the memory (150).

[0051] The one or more processors (140) may include one or more of a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), an Accelerated Processing Unit (APU), a Many Integrated Core (MIC), a Digital Signal Processor (DSP), a Neural Processing Unit (NPU), a hardware accelerator, or a machine learning accelerator. The one or more processors (140) may control one or any combination of other components of the display device, and may perform operations related to communication or data processing. The one or more processors (140) may execute one or more programs or instructions stored in a memory. For example, the one or more processors may perform a method according to one or more embodiments of the present disclosure by executing one or more instructions stored in a memory.

[0052] When a method according to one or more embodiments of the present disclosure includes multiple operations, the multiple operations may be performed by one processor or by multiple processors. For example, when a first operation, a second operation, and a third operation are performed by a method according to one or more embodiments, the first operation, the second operation, and the third operation may all be performed by the first processor, or the first operation and the second operation may be performed by the first processor (e.g., a general-purpose processor) and the third operation may be performed by the second processor (e.g., an artificial intelligence-specific processor).

[0053] One or more processors (140) may be implemented as a single core processor including one core, or may be implemented as one or more multicore processors including multiple cores (e.g., homogeneous multicores or heterogeneous multicores). When one or more processors (140) are implemented as a multicore processor, each of the multiple cores included in the multicore processor may include an internal processor memory, such as a cache memory or an on-chip memory, and a common cache shared by the multiple cores may be included in the multicore processor. In addition, each of the multiple cores (or some of the multiple cores) included in the multicore processor may independently read and execute a program instruction for implementing a method according to one or more embodiments of the present disclosure, or all (or some) of the multiple cores may be linked to read and execute a program instruction for implementing a method according to one or more embodiments of the present disclosure.

[0054] When a method according to one or more embodiments of the present disclosure includes a plurality of operations, the plurality of operations may be performed by one core among the plurality of cores included in a multi-core processor, or may be performed by the plurality of cores. For example, when a first operation, a second operation, and a third operation are performed by a method according to one or more embodiments, the first operation, the second operation, and the third operation may all be performed by a first core included in the multi-core processor, or the first operation and the second operation may be performed by a first core included in the multi-core processor, and the third operation may be performed by a second core included in the multi-core processor.

[0055] In the embodiments of the present disclosure, a processor may mean a system on a chip (SoC) in which one or more processors and other electronic components are integrated, a single-core processor, a multi-core processor, or a core included in a single-core processor or a multi-core processor, wherein the core may be implemented as a CPU, a GPU, an APU, a MIC, a DSP, an NPU, a hardware accelerator, or a machine learning accelerator, but the embodiments of the present disclosure are not limited thereto. Hereinafter, for the convenience of description, one or more processors (140) will be referred to as a processor (140).

[0056] FIGS. 3A and 3B are block diagrams specifically illustrating the configuration of a display device according to one or more embodiments.

[0057] According to one or more embodiments, the display panel (110) includes a plurality of display modules (110-1 to 110-n). In particular, the display panel (110) may be configured in an assembled form by connecting a plurality of display modules (110-1 to 110-n). Here, each of the plurality of display modules may include a plurality of pixels, for example, self-luminous pixels, arranged in a matrix form. According to one embodiment, the display panel (110) may be implemented with a plurality of LED modules (an LED module including at least one LED element) and / or a plurality of LED cabinets. In addition, the LED module may include a plurality of LED pixels. According to one example, the LED pixels may be implemented with RGB LEDs, and the RGB LEDs may include a RED LED, a GREEN LED, and a BLUE LED together.

[0058] 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 implemented to supply driving current to the plurality of display modules (110-1 to 110-n). The driving current may correspond to each control signal input from the processor (140) described below. For example, the plurality of drivers adjust and output the supply time or intensity of the driving current supplied to the plurality of display modules (110-1 to 110-n) so as to correspond to each control signal input from the processor (140).

[0059] According to one example, the display device (100) may further include a plurality of converters (e.g., DC-DC converters). When a DC voltage output from a power supply device (130) is input, the plurality of converters may generate a DC voltage, which is a driving voltage of each corresponding configuration. A first converter among the plurality of converters may convert the DC voltage input from the power supply device (130) into a driving voltage (V_LED) supplied to a light-emitting element. For example, when a DC output voltage of the power supply device (130) generated based on AC power is input, the first converter may generate a rectified DC voltage (V_LED) that is balanced so that the current provided to the array of light-emitting elements is the same, and then provide the rectified DC voltage to each light-emitting element. A second converter among the plurality of converters may convert the DC voltage input from the power supply device (130) into a driving voltage (V_DD) supplied to the driver (120). Specifically, for example, when the DC output voltage of the power supply (130) generated based on AC power is input, the second converter can generate a driving voltage (V_DD) of the driver (120) set according to the specifications of components such as internal FETs and TRs of the driver (120) and provide the same to each driver (120). For example, when the power supply (130) that receives an AC voltage of 220 V generates a DC voltage of 19 V and provides the same to the first converter and the second converter, the first converter can convert the DC voltage of 3.8 V as the driving voltage (V_LED) of the light-emitting element, and the second converter can convert the DC voltage of 3.3 V as the driving voltage (V_DD) of the driver (120), and provide the same to the light-emitting element and the driver (120), respectively. For convenience of explanation, both the driving voltage (V_LED) and the driving voltage (V_DD) will be collectively referred to as voltages for driving the display panel (110) hereinafter.

[0060] According to one or more embodiments, the power supply (130) may include multiple power supplies that supply power to multiple display modules (110-1 to 110-n).

[0061] According to the embodiment illustrated in FIG. 3b, each of the plurality of power supply units (130-1,..., 130-n) can supply power to each of the plurality of display modules (110-1,..., 110-n). For example, each of the plurality of display modules (110-1,..., 110-n) is implemented as an LED cabinet, and the plurality of power supply units (130-1,..., 130-n) can supply power to each of the LED cabinets.

[0062] According to an example, each of the plurality of power supply units (130-1,..., 130-n) may include a plurality of SMPSs. For example, as illustrated in FIG. 3b, the power supply unit (130-1) corresponding to the first display module (110-1) among the plurality of display modules (110-1,..., 110-n) may include a plurality of SMPSs, for example, SMPS 1 and SMPS 2, and the power supply unit (130-n) corresponding to the n-th display module (110-n) may also include a plurality of SMPSs, for example, SMPS 1 and SMPS 2.

[0063] FIG. 4 is a drawing for explaining a method of driving a display device according to one or more embodiments.

[0064] According to FIG. 4, when the processor (140) detects that the voltage supplied to the power supply (130) is “off” based on the output voltage of the power supply (130) (S410:Y), the processor (140) can identify power-off sequence information of at least one driver (120) (S420). In one example, the processor (140) and at least one driver (120) may be implemented as separate circuits (or separate chips). For example, the processor (140) may be implemented as an FPGA (Field Programmable gate array), and the driver (120) may be implemented as a Display Driver IC (Integrated Circuit), but is not limited thereto.

[0065] For example, the power-off sequence may be different depending on the specifications of at least one driver (120). For example, power-off sequence information corresponding to the specifications of each driver (120) may be stored in memory in the form of a lookup table or received from an external device.

[0066] According to one example, the processor (140) can detect a power line from which a DC (Direct current) voltage is output from the power supply (130) to identify whether the AC (Alternating current) power supplied through the power supply (130) is turned off. For example, it can identify whether the AC (Alternating current) power is turned off based on the output voltage of a power sense line (V sense) that detects the output voltage of the power supply (130).

[0067] The processor (140) can sequentially control a plurality of signals transmitted to at least one driver to a low state based on the identified power-off sequence information before the power for driving the display panel (110) is shut down (S430).

[0068] According to one or more embodiments, the processor (140) may sequentially control a reset signal and at least one power signal transmitted to the driver (120) to a low state based on power-off sequence information of the driver (120).

[0069] According to one or more embodiments, the processor (140) may sequentially control a plurality of signals among a reset signal, at least one power signal, at least one sync signal, and at least one clock signal transmitted to the driver (120) to a low state based on power-off sequence information of the driver (120).

[0070] According to one or more embodiments, when the power supplied from the power supply (130) is turned off and the output voltage of the power supply (130) decreases and reaches a preset voltage, the device may further include a detection circuit for outputting an off sequence signal identified by at least one driver (120). In one example, the detection circuit may be connected to a power detection line terminal (V sense) that detects the output voltage of the power supply (130).

[0071] According to one or more embodiments, when there are multiple power supply units (e.g., SMPS1, SMPS2) corresponding to one display module (e.g., cabinet) as illustrated in FIG. 3b, when all of the multiple power supply units are turned off, multiple signals transmitted to the driver corresponding to the display module can be sequentially controlled to a low state based on power-off sequence information.

[0072] According to one or more embodiments, when there are multiple power supply units (e.g., SMPS1, SMPS2) corresponding to one display module (e.g., cabinet) as illustrated in FIG. 3B, when only some of the multiple power supply units are turned off, the processor (140) may control a driver corresponding to the display module so that the display module operates in a low brightness mode. For example, the processor (140) may control a driver corresponding to the display module so that the display module operates in a low brightness mode based on a difference between the power amount of a power supply unit that is turned on among the multiple power supply units, or the power amount when all of the multiple power supply units are turned on and the power amount of the power supply unit that is currently turned on.

[0073] FIGS. 5A to 5C are drawings illustrating implementation examples of a detection circuit according to one or more embodiments.

[0074] According to FIG. 5A, the sensing circuit (510) may include a first resistor (R1) connected to an output terminal of a power supply (130) and a second resistor (R2) having one end connected to the first resistor (R1) and the other end grounded. In one example, the output terminal of the power supply (130) to which the first resistor (R1) is connected may include a power sense line terminal (V sense) that senses an output voltage of the power supply (130).

[0075] According to one example, the processor (140) can identify whether the output voltage of the power supply (130) has been reduced to reach a preset voltage based on the output terminal voltage between the first resistor (R1) and the second resistor (R2).

[0076] For example, the output terminal voltage between the first resistor (R1) and the second resistor (R2) can be determined according to the output voltage of the power supply (130) and the sizes of the first resistor (R1) and the second resistor (R2). The sizes of the first resistor (R1) and the second resistor (R2) can be determined to appropriate values ​​according to the output voltage of the power supply (130). For example, when the output voltage of the power supply (130) is 13 V and the preset voltage is set to 1.3, R1 and R2 can be set to appropriate values ​​such that R1 / (R1+R2)=1 / 10.

[0077] According to FIG. 5b, the display device (100) may include a plurality of power supply units (131, 132) and a plurality of detection circuits (510, 520) that detect output voltages of the plurality of power supply units (131, 132). In one example, the plurality of power supply units (131, 132) may be implemented to supply power to one display module.

[0078] The first detection circuit (150) may include a first resistor (R1) connected to an output terminal of a first power supply (131) and a second resistor (R2) having one end connected to the first resistor (R1) and the other end grounded. In one example, the output terminal of the first power supply (131) to which the first resistor (R1) is connected may include a first power detection line terminal (V sense) that detects an output voltage of the first power supply (131).

[0079] According to one example, the processor (140) can identify whether the output voltage of the first power supply (131) is reduced to reach a preset first voltage based on the output terminal voltage between the first resistor (R1) and the second resistor (R2).

[0080] The second sensing circuit (152) may include a third resistor (R3) connected to an output terminal of the second power supply (132) and a fourth resistor (R4) having one end connected to the third resistor (R3) and the other end grounded. In one example, the output terminal of the second power supply (132) to which the third resistor (R3) is connected may include a second power sensing line terminal (V sense) that senses an output voltage of the second power supply (132).

[0081] For example, the processor (140) can identify whether the output voltage of the second power supply (132) is reduced to reach a preset second voltage based on the output terminal voltage between the third resistor (R3) and the fourth resistor (R4). Here, the preset second voltage may be the same as or different from the preset first voltage. For example, the magnitudes of the preset first voltage and the preset second voltage may be determined based on the supply power of the first power supply (131) and the supply power of the second power supply (132).

[0082] 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) may be connected through a logic circuit (530). According to one example, the logic circuit may be implemented as an OR gate that outputs a low signal when the voltage of the first output terminal is low and the voltage of the second output terminal is low. Here, low may mean a case where the output voltage is lower than (or below) a voltage set at each output terminal. In this case, the processor (140) may identify that the power supplied to the power supply device (130) is turned off when a low signal is output from the logic circuit (530). That is, the processor (140) may perform the power-off sequence operation described above only when power is turned off in all of the plurality of power supply devices when the display device (100) includes a plurality of power supply devices.

[0083] According to one or more embodiments, the power-off sequence information may include information regarding 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 sync signal, and a clock signal. For example, each type of signal may include multiple signals. For example, the power signal may include multiple signals including a first power signal and a second power signal.

[0084] According to FIG. 5c, the display device (100) may include a plurality of power supply units (131, 132) and a plurality of detection circuits (510, 520) that detect output voltages of the plurality of power supply units (131, 132). In one example, the plurality of power supply units (131, 132) may be implemented to supply power to one display module.

[0085] The first detection circuit (150) may include a first resistor (R1) connected to an output terminal of a first power supply (131) and a second resistor (R2) having one end connected to the first resistor (R1) and the other end grounded. In one example, the output terminal of the first power supply (131) to which the first resistor (R1) is connected may include a first power detection line terminal (V sense) that detects an output voltage of the first power supply (131).

[0086] According to one example, the processor (140) can identify whether the output voltage of the first power supply (131) is reduced to reach a preset first voltage based on the output terminal voltage between the first resistor (R1) and the second resistor (R2).

[0087] The second sensing circuit (152) may include a third resistor (R3) connected to an output terminal of the second power supply (132) and a fourth resistor (R4) having one end connected to the third resistor (R3) and the other end grounded. In one example, the output terminal of the second power supply (132) to which the third resistor (R3) is connected may include a second power sensing line terminal (V sense) that senses an output voltage of the second power supply (132).

[0088] For example, the processor (140) can identify whether the output voltage of the second power supply (132) is reduced to reach a preset second voltage based on the output terminal voltage between the third resistor (R3) and the fourth resistor (R4). Here, the preset second voltage may be the same as or different from the preset first voltage. For example, the magnitudes of the preset first voltage and the preset second voltage may be determined based on the supply power of the first power supply (131) and the supply power of the second power supply (132).

[0089] 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) may be connected through a logic circuit (540). According to one example, the logic circuit may be implemented as an AND gate that outputs a low signal when either the voltage of the first output terminal or the voltage of the second output terminal is low. Here, low may mean a case where the output voltage is lower than (or below) a voltage set at each output terminal. In this case, the processor (140) may identify that the power supplied from either the first power supply unit (131) or the second power supply unit (132) is turned off when a low signal is output from the logic circuit (540). In this case, the processor (140) may control the display panel (110) to operate in a low brightness mode. For example, the display panel (110) can be controlled so that a specific display module corresponding to a plurality of power supply units (131, 132) operates in a low brightness mode.

[0090] For example, the processor (140) may adjust the luminance value of each region of the display panel (110) to be lowered based on the power of the power supply unit that is not turned off when the power of one of the plurality of power supply units (131, 132) is turned off. In this case, the processor (140) may identify a current gain value for each subpixel corresponding to the adjusted luminance value, and control a driver corresponding to each region of the display panel (110) based on the identified current gain value.

[0091] FIG. 6 is a diagram illustrating a power off sequence operation according to one or more embodiments.

[0092] According to one or more embodiments, a plurality of signals, for example, a driving signal (V_LED) (611), a clock signal (SCLK) (613), and a data signal (SIN) (614), are transmitted to the driver (120), and it is assumed that the power-off sequence information of the driver (120) is information that controls the clock signal (SCLK) (613) and the data signal (SIN) (614) to a low state before the driving signal (V_LED) (611).

[0093] In this case, when the power supply unit (130) is turned off, the processor (140) can detect a signal (V sense) (612) output from the power supply unit (130) and control the clock signal (SCLK) (613) and data signal (SIN) (614) to a low state before the drive signal (V_LED) (611) (e.g., 3.8 V) among the plurality of signals (611, 613, 614).

[0094] For example, the upper side is a signal waveform before the embodiment of the present disclosure is applied, in which the driving signal (V_LED) (611) is controlled to a low state compared to the clock signal (SCLK) (613) and the data signal (SIN) (614), but referring to the lower side signal waveform after the embodiment of the present disclosure is applied, as soon as the low state of the signal (V sense) (612) output from the power supply (130) is detected, the clock signal (SCLK) (613) and the data signal (SIN) (614) are first controlled to a low state, and then the driving signal (V_LED) (611) is controlled to a low state so as to correspond to the power-off sequence information of the driver (120).

[0095] FIG. 7 is a diagram illustrating a power off sequence operation according to one or more embodiments.

[0096] According to one or more embodiments, a plurality of signals, for example, a reset signal (711), a first driving signal (V_DD) (712) and a second driving signal (V_LED) (714), are transmitted to the driver (120), and it is assumed that the power-off sequence information of the driver (120) is information that controls the reset signal (711) to a low state before the first driving signal (V_DD) (712) and the second driving signal (V_LED) (714).

[0097] In this case, when the power supply unit (130) is turned off, the processor (140) can detect a signal (V sense) (713) output from the power supply unit (130) and control the reset signal (711) among the plurality of signals (711, 712, 714) to a low state before the first driving signal (V_DD) (712) and the second driving signal (V_LED) (714).

[0098] For example, the upper side is a signal waveform before the embodiment of the present disclosure is applied, in which the second driving signal (V_LED) (714) is controlled to a low state compared to the reset signal (711), but referring to the lower side signal waveform after the embodiment of the present disclosure is applied, as soon as the low state of the signal (V sense) (713) output from the power supply (130) is detected, the reset signal (711) may be first controlled to a low state, and then the first driving signal (V_DD) (712) and the second driving signal (V_LED) (714) may be controlled to a low state so as to correspond to the power-off sequence information of the driver (120). That is, the processor (140) may first control the reset signal (711) to a low state based on the power-off sequence information, and then control the power signals, that is, the first driving signal (V_DD) (712) and the second driving signal (V_LED) (714), to a low state.

[0099] Meanwhile, the interface signal transmitted to the driver (120) may include various signals depending on the implementation form of the driver (120), such as an SPI signal, a CLK signal, and an LVDS signal.

[0100] FIGS. 8A and 8B are drawings for explaining a method of driving a display device according to one or more embodiments.

[0101] According to FIG. 8a, a display device (100') may include a display panel (110), a driver (120), a power supply (130), one or more processors (140), a communication interface (150), and a user interface (160). Among the configurations illustrated in FIG. 8a, a detailed description of configurations that overlap with the configuration illustrated in FIG. 2 will be omitted.

[0102] It goes without saying that the communication interface (150) can be implemented as various interfaces depending on the implementation example of the display device (100'). For example, the communication interface (150) can communicate with an external device, an external storage medium (e.g., a USB memory), an external server (e.g., a web hard drive), etc. through a communication method such as Bluetooth, AP-based Wi-Fi (Wireless LAN network), Zigbee, wired / wireless LAN (Local Area Network), WAN (Wide Area Network), Ethernet, IEEE 1394, HDMI (High-Definition Multimedia Interface), USB (Universal Serial Bus), MHL (Mobile High-Definition Link), AES / EBU (Audio Engineering Society / European Broadcasting Union), optical, coaxial, etc. According to one example, the communication interface (150) can communicate with another display device, an external server, and / or a remote control device.

[0103] The user interface (160) may be implemented as a device such as a button, a touch pad, a mouse, and a keyboard, or as a touch screen that can also perform the display function and operation input function described above.

[0104] In one example, when a power-off signal is received through the communication interface (150) and / or the user interface (160), the processor (140) may sequentially control a plurality of signals transmitted to at least one driver to a low state based on power-off sequence information before the power is shut down. For example, when a power-off remote control signal is received from a remote control device, the processor (140) may sequentially control a plurality of signals transmitted to at least one driver to a low state based on power-off sequence information before the power of the display device (100') is shut down.

[0105] According to an example illustrated in FIG. 8B, when a power-off signal is received through the communication interface (150) and / or the user interface (160), the processor (140) may receive the power-off signal through the MCU Micro Controller Unit (810). For example, the power-off remote control signal received through the communication interface (150) may be processed by the MCU (810) and transmitted to the processor (140). In this case, the processor (140) may sequentially control a plurality of signals transmitted to at least one driver to a low state based on power-off sequence information before the power of the display device (100') is shut down based on the power-off signal transmitted from the MCU (810).

[0106] As described above, the processor (140) can perform the same control operation based on the power-off signal received through the communication interface (150) and / or the user interface (160) as well as the output signal of the power supply device (130). A specific embodiment of sequentially controlling a plurality of signals transmitted to at least one driver to a low state based on the power-off sequence information is the same as that described in FIGS. 1 to 7, and therefore, a detailed description thereof will be omitted.

[0107] FIG. 9 is a block diagram specifically illustrating a configuration of a display device according to one or more embodiments.

[0108] According to FIG. 9, the display device (100") may include a display panel (110), a driver (120), a power supply (130), one or more processors (140), a communication interface (150), a user interface (160), a memory (170), a camera (180), and a speaker (190). Among the configurations illustrated in FIG. 9, a detailed description of configurations that overlap with those illustrated in FIG. 2 and FIG. 8A will be omitted.

[0109] The memory (170) can store data required for various embodiments. The memory (170) may be implemented in the form of memory embedded in the display device (100") or in the form of memory detachable from the display device (100"), depending on the purpose of data storage. For example, data for driving the display device (100) may be stored in a memory embedded in the display device (100"), and data for the expansion function of the display device (100) may be stored in a memory detachable from the display device (100"). Meanwhile, in the case of memory embedded in the display device (100"), it may be implemented as at least one of volatile memory (e.g., dynamic RAM (DRAM), static RAM (SRAM), or synchronous dynamic RAM (SDRAM)), non-volatile memory (e.g., one time programmable ROM (OTPROM), programmable ROM (PROM), erasable and programmable ROM (EPROM), electrically erasable and programmable ROM (EEPROM), mask ROM, flash ROM, flash memory (e.g., NAND flash or NOR flash), hard drive, or solid state drive (SSD)). In addition, in the case of memory that can be detachably attached to the display device (100'), it may be implemented as at least one of memory cards (e.g., compact flash (CF), secure digital (SD), micro secure digital (Micro-SD), mini secure digital (Mini-SD), extreme digital (xD), multi-media card (MMC), etc.), external memory that can be connected to a USB port (e.g., USB memory), etc. It can be implemented in the form of.

[0110] The memory (170) stores 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 not be stored in the memory (170) but may be acquired from an external device. For example, some information may be received in real time from an external device such as a set-top box, an external server, a user terminal, etc. For example, the memory (170) can store current information of a plurality of display modules (110-1, . . . , 110-n). Here, the current information may be current control information according to the luminance of each sub-pixel constituting the display module. Here, the current control information according to the luminance of each sub-pixel may be current control information according to the luminance of each sub-pixel calibrated (modeled) based on the luminance characteristics and color shift characteristics according to the current of each sub-pixel.

[0111] The speaker (180) may be configured to output various audio data as well as various notification sounds or voice messages. The processor (140) may control the speaker (180) to output feedback or various notifications in audio format according to various embodiments of the present disclosure.

[0112] The camera (190) can be turned on and take pictures according to a preset event. The camera (190) can convert the captured image into an electrical signal and generate image data based on the converted signal. For example, the subject can be converted into an electrical image signal through a semiconductor optical element (CCD; Charge Coupled Device), and the converted image signal can be amplified and converted into a digital signal and then signal processed. For example, the camera (190) can be implemented as a general camera, a stereo camera, a depth camera, etc.

[0113] In addition, the display device (100") may include a sensor, a microphone, a tuner, a demodulator, etc., depending on the implementation example.

[0114] The sensors may include various types of sensors, such as touch sensors, proximity sensors, acceleration sensors (or gravity sensors), geomagnetic sensors, gyro sensors, pressure sensors, position sensors, distance sensors, light sensors, etc.

[0115] A microphone is a device configured to receive a user's voice or other sounds and convert them into audio data. However, according to another embodiment, the display device (100") may receive a user's voice input through an external device through a communication interface (150).

[0116] The tuner can receive RF broadcast signals by tuning to a channel selected by the user or all previously stored channels among RF (Radio Frequency) broadcast signals received through an antenna.

[0117] The demodulator receives and demodulates a digital IF signal (DIF) converted from the tuner, and can also perform channel decoding, etc.

[0118] According to the various embodiments described above, it is possible to detect the output voltage of the power supply and control a signal according to the off sequence of the driver IC before shutdown due to AC power off, thereby preventing screen overshoot.

[0119] Additionally, the methods according to the various embodiments of the present disclosure described above can be implemented only with a software upgrade or a hardware upgrade for an existing electronic device.

[0120] Additionally, the various embodiments of the present disclosure described above can also be performed through an embedded server provided in an electronic device, or an external server of the electronic device.

[0121] Meanwhile, according to a temporary example of the present disclosure, the various embodiments described above can be implemented as software including instructions stored in a machine-readable storage medium that can be read by a machine (e.g., a computer). The device is a device that can call instructions stored from the storage medium and operate according to the called instructions, and may include an electronic device (e.g., electronic device (A)) according to the disclosed embodiments. When an instruction is executed by a processor, the processor can perform a function corresponding to the instruction directly or by using other components under the control of the processor. The instruction may include code generated 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, 'non-transitory' means that the storage medium does not contain a signal and is tangible, but does not distinguish between data being stored semi-permanently or temporarily in the storage medium.

[0122] Furthermore, according to one or more embodiments of the present disclosure, the methods according to the various embodiments described above may be provided as included in a computer program product. The computer program product may be traded as a commodity between sellers and buyers. The computer program product may be distributed in the form of a machine-readable storage medium (e.g., compact disc read only memory (CD-ROM)) or online through an application store (e.g., Play Store™). In the case of online distribution, at least a portion of the computer program product may be temporarily stored or temporarily generated in a storage medium, such as the memory of a manufacturer's server, an application store's server, or a relay server.

[0123] In addition, each of the components (e.g., modules or programs) according to the various embodiments described above may be composed of a single or multiple entities, and some of the corresponding sub-components described above may be omitted, or other sub-components may be further included in various embodiments. Alternatively or additionally, some components (e.g., modules or programs) may be integrated into a single entity, which may perform the same or similar functions as those performed by each of the corresponding components prior to integration. Operations performed by modules, programs or other components according to various embodiments may be executed sequentially, in parallel, iteratively or heuristically, or at least some operations may be executed in a different order, omitted, or other operations may be added.

[0124] Although the preferred embodiments of the present disclosure have been illustrated and described above, the present disclosure is not limited to the specific embodiments described above, and various modifications may be made by a person having ordinary skill in the art to which the present disclosure pertains without departing from the gist of the present disclosure as claimed in the claims, and such modifications should not be understood individually from the technical idea or prospect of the present disclosure.

Claims

1. In the display device (100, 100'), A display panel (110) comprising a plurality of light-emitting elements; At least one driver (120, 120-1) for driving the plurality of light-emitting elements; Power supply (130, 130-1, 130-n, 131, 132); and When it is detected that the power supplied to the power supply device (130, 130-1, 130-n, 131, 132) is turned off based on the output voltage of the power supply device (130, 130-1, 130-n, 131, 132), power off sequence information of at least one driver (120, 120-1) is identified, A display device including at least one processor (140) for sequentially controlling a plurality of signals (611, 613, 614, 711, 712, 714) transmitted to at least one driver (120, 120-1) to a low state based on the identified power-off sequence information before the voltage for driving the display panel (110) is shut down.

2. In paragraph 1, The above one or more processors (140) A display device that detects a power line outputting a DC (Direct current) voltage from the power supply device (130, 130-1, 130-n, 131, 132) and identifies whether the AC (Alternating current) power supplied through the power supply device (130, 130-1, 130-n, 131, 132) is turned off.

3. In paragraph 1, The above display panel (110) is A modular display panel (110) comprising a plurality of display modules (10, ..., 90), At least one driver (120, 120-1) above, A display device comprising a plurality of drivers (120, 120-1) corresponding to the plurality of display modules (10, ..., 90).

4. In paragraph 3, The above power supply unit (130, 130-1, 130-n, 131, 132) A first power supply unit (1310) that supplies power to a specific display module (10, ..., 90) among the plurality of display modules (10, ..., 90); and It includes a second power supply device (132) that supplies power to a specific display module (10, ..., 90) among the plurality of display modules (10, ..., 90); The above one or more processors (140) A display device that detects whether power supplied to the first power supply unit (131) and the second power supply unit (132) is turned off based on the output voltages of the first power supply unit (131) and the second power supply unit (132).

5. In paragraph 1, The above one or more processors (140) A display device further comprising a detection circuit (510, 511, 512, 520) for outputting an off sequence signal (611, 613, 614, 711, 712, 714) identified by at least one driver (120, 120-1) when the output voltage of the power supply device (130, 130-1, 130-n, 131, 132) decreases and reaches a preset voltage as the power supplied from the power supply device (130, 130-1, 130-n, 131, 132) is turned off.

6. In paragraph 5, The above detection circuit (510, 511, 512, 520) A display device connected to a power sense line terminal (V sense) that detects the output voltage of the above power supply device (130, 130-1, 130-n, 131, 132).

7. In paragraph 5, The above detection circuit (510, 511, 512, 520) A first resistor connected to the output terminal of the power supply unit (130, 130-1, 130-n, 131, 132) and a second resistor having one end connected to the first resistor and the other end grounded, A display device that identifies whether the output voltage of the power supply unit 130, 130-1, 130-n, 131, 132) is reduced to reach a preset voltage based on the output terminal voltage between the first resistor and the second resistor.

8. In paragraph 5, The above detection circuit (510, 511, 512, 520) A first sensing circuit (151) connected to the first power supply; A second sensing circuit (152) connected to a second power supply; and It includes a logic circuit (530, 540) connected to the first output terminal (131) of the first detection circuit (151) and the second output terminal (132) of the second detection circuit (152); The above logic circuit (530, 540) It is implemented as an OR gate that outputs a low signal (611, 613, 614, 711, 712, 714) when the voltage of the first output terminal is low and the voltage of the second output terminal is low. The above one or more processors (141) A display device that identifies that power supplied to the power supply device (130, 130-1, 130-n, 131, 132) is turned off when a low signal (611, 613, 614, 711, 712, 714) is output from the logic circuit (530, 540).

9. In paragraph 1, The above one or more processors (140) A display device that sequentially controls a reset signal (711) and at least one power signal (611, 613, 614, 711, 712, 714) transmitted to at least one driver (120, 120-1) to a low state based on the identified off-sequence information.

10. In paragraph 1, The above one or more processors (140) A display device that sequentially controls a plurality of signals (611, 613, 614, 711, 712, 714) among a reset signal (711), at least one power signal 611, 613, 614, 711, 712, 714), at least one sync signal 611, 613, 614, 711, 712, 714) and at least one clock signal 611, 613, 614, 711, 712, 714) to a low state based on the identified off-sequence information.

11. In a method of driving a display device (100, 100'), A step of identifying power off sequence information of at least one driver (120, 120-1) for driving a display panel (110) when power supplied to the power supply (130, 130-1, 130-n, 131, 132) is detected to be off based on the output voltage of the power supply (130, 130-1, 130-n, 131, 132); and A driving method, comprising: a step of sequentially controlling a plurality of signals (611, 613, 614, 711, 712, 714) transmitted to at least one driver (120, 120-1) to a low state based on the identified power-off sequence information before the voltage for driving the display panel (110) is shut down.

12. In paragraph 11, The step of identifying the power off sequence information of at least one driver (120, 120-1) is: A driving method for detecting a power line from which a DC (Direct current) voltage is output from the power supply device (130, 130-1, 130-n, 131, 132) and identifying whether the AC (Alternating current) power supplied through the power supply device (130, 130-1, 130-n, 131, 132) is turned off.

13. In paragraph 11, The above display panel (110) is A modular display panel (110) comprising a plurality of display modules (10, ..., 90), At least one driver (120, 120-1) above, A driving method comprising a plurality of drivers (120, 120-1) corresponding to the plurality of display modules (10, ..., 90).

14. In paragraph 11, The above display device (100, 100') is A driving method further comprising a detection circuit (510, 511, 512, 520) for outputting an off sequence signal (611, 613, 614, 711, 712, 714) identified by at least one driver (120, 120-1) when the output voltage of the power supply device (130, 130-1, 130-n, 131, 132) decreases and reaches a preset 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 cause the display device (100, 100') to perform an operation when executed by the processor (140) of the display device (100, 100'), The above actions are, A step of identifying power off sequence information of at least one driver (120, 120-1) for driving a display panel (110) when power supplied to the power supply (130, 130-1, 130-n, 131, 132) is detected to be off based on the output voltage of the power supply (130, 130-1, 130-n, 131, 132); and A non-transitory computer-readable medium comprising a step of sequentially controlling a plurality of signals (611, 613, 614, 711, 712, 714) transmitted to at least one driver (120, 120-1) to a low state based on the identified power-off sequence information before the voltage for driving the display panel (110) is shut down.

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