Display device and control method thereof

Abstract

The present invention relates to a display device for saving power and a control method thereof. The display device powers down the power supplied to at least one of display drivers on the basis of entering an always on display mode, maintains the power supplied to a display panel, restores the power supplied to at least one of a first processor, a second processor, or the display drivers on the basis of entering an update mode, and maintains the power supplied to the display panel.

Description

Display device and control method thereof

[0001] The disclosed invention relates to a display device for displaying an image in a constant display mode and a method for controlling the same.

[0002] Liquid crystal display (LCD) devices, organic light emitting diode (OLED)-based display devices, mini light emitting diode (mini LED)-based display devices, and micro light emitting diode (micro LED)-based display devices are widely used as display devices.

[0003] Among these, OLED (organic light emitting diode)-based display devices can continuously display information such as the time, date, remaining battery level, or notifications through the display panel while in sleep mode. This is called Always On Display (AOD) mode. In other words, Always On Display mode is a mode that allows the user to check information such as the time, date, remaining battery level, or notifications through the display panel when the display device is in sleep mode.

[0004] Organic light-emitting diode-based display devices supply power to various components to display images even when operating in always-on display mode. This has led to significant power consumption even during always-on display mode.

[0005] One aspect of the disclosed invention provides a display device and a control method thereof that maintain power supplied to a display panel based on a constant display mode and reduce power supplied to a panel processor and a display driver.

[0006] Another aspect of the disclosed invention provides a display device and a control method thereof for recovering power supplied to a panel processor and a display driver based on an update mode for updating an image displayed in an always-on display mode.

[0007] Another aspect of the disclosed invention provides a display device and a control method thereof that display images at a first frame rate based on a normal display mode and display images at a second frame rate based on a constant display mode.

[0008] A display device according to one aspect includes a display panel; a display driver electrically connected to the display panel; a panel processor transmitting a driving signal to the display driver; and a power supply unit supplying power to the display panel, the display driver, and the panel processor. The panel processor of the display device according to one aspect controls the power supply unit so that power supplied to the display panel is maintained in a constant display mode and power supplied to at least one of the display driver and the panel processor is turned off.

[0009] A panel processor of a display device according to one aspect includes a first processor that receives a video signal from an external device, and a second processor that converts the video signal received from the first processor into a pixel-by-pixel driving signal and transmits the converted pixel-by-pixel driving signal to a display driver.

[0010] A first processor of a display device according to one aspect includes a central processing unit that processes an image signal received from an external device, a display controller that controls transmission of the received image signal, a first communication interface that transmits the received image signal to a second processor, and a first power controller that controls power supply to the central processing unit, the display controller, and the display controller. The first power controller of the display device according to one aspect receives power from a power supply unit in a constant display mode, and cuts off power supplied to the central processing unit, the display controller, and the display controller.

[0011] A second processor of a display device according to one aspect includes a second communication interface for performing communication with a first processor, a low-power memory for storing an image, an image processing device for processing a received image, a timing controller for controlling operation timing of the low-power memory and the image processing device, and a second power controller for controlling power supplied to the second communication interface, the low-power memory, the image processing device, and the timing controller. The second power controller of the display device according to one aspect receives power from a power supply unit in an always-on display mode, and cuts off power supplied to the second communication interface, the low-power memory, the image processing device, and the timing controller.

[0012] A second power controller of a display device according to one aspect supplies reference power to a display driver in a constant display mode. The reference power is power that makes the brightness of the display panel in the display mode equal to the reference brightness.

[0013] A second processor of a display device according to one aspect controls to transmit an image stored in a low-power memory to a display driver based on the power supplied to the first processor being down.

[0014] A first power controller of a display device according to one aspect maintains power supplied to a central processing unit, a display controller, and a display controller while performing an always-on display mode based on information set in a voice recognition mode.

[0015] A panel processor of a display device according to one aspect controls a display driver so that an image received based on a normal display mode is output at a first frame rate, and controls the display driver so that an image received based on a constant display mode is output at a second frame rate. A frequency corresponding to the second frame rate is the same as or lower than a frequency corresponding to the first frame rate.

[0016] A panel processor of a display device according to one aspect controls a power supply so that power supplied to the display driver and the panel processor is restored based on the point in time when it is time to enter an update mode for updating an image displayed in an always-on display mode.

[0017] A panel processor of a display device according to one aspect controls a display driver so that a received image is output at a second frame rate based on an update mode.

[0018] The panel processor of the display device, according to one aspect, determines when to enter update mode when a user is recognized.

[0019] A display device according to one aspect further includes a communication unit that performs communication with a user device. A panel processor of the display device according to one aspect determines a point in time for entering an update mode based on receiving a communication signal from the user device.

[0020] A display device according to one aspect further includes a communication unit that performs communication with a home appliance. A panel processor of the display device according to one aspect determines the point in time when an update mode is entered based on event information received from the home appliance.

[0021] A display panel of a display device according to one aspect controls pixel shift when performing an update mode.

[0022] A panel processor of a display device according to one aspect determines a point in time when a blank mode is entered while performing a constant display mode, and controls a display driver to output a pre-stored image at a third frame rate based on the point in time determined as the point in time when the blank mode is entered. The frequency corresponding to the third frame rate is a lower frequency than the frequencies corresponding to the first and second frame rates.

[0023] In another aspect, a method for controlling a display device comprises: reducing power supplied to at least one of the display drivers based on entry into an always-on display mode, maintaining power supplied to the display panel, restoring power supplied to at least one of the first processor, the second processor, and the display driver based on entry into an update mode, and maintaining power supplied to the display panel. In the method for controlling a display device according to another aspect, the first processor is a processor that transmits an image signal received from an external device to the second processor. In the method for controlling a display device according to another aspect, the second processor is a processor that converts the image signal into a driving signal and transmits the same to the display driver. In the method for controlling a display device according to another aspect, the display driver is a driver that transmits the driving signal to the display panel.

[0024] A method for controlling a display device according to another aspect further includes outputting a video signal at a first frame rate based on a normal display mode, outputting a video signal at a second frame rate based on a constant display mode, and outputting a video signal at the second frame rate based on an update mode.

[0025] The frequency corresponding to the second frame rate is the same as or lower than the frequency corresponding to the first frame rate.

[0026] A method for controlling a display device according to another aspect further includes determining entry into a blank mode while performing a constant display mode, and outputting a video signal at a third frame rate based on the entry into the blank mode. The frequency corresponding to the third frame rate is lower than the frequencies corresponding to the first and second frame rates.

[0027] A method for controlling a display device according to another aspect further includes recognizing a user using at least one of a human body detection sensor and a user device, and determining a time point for entering an update mode based on the user being recognized.

[0028] A method for controlling a display device according to another aspect further includes determining a point of entry into an update mode based on receiving event information from a home appliance.

[0029] According to the disclosed invention, one aspect can reduce power consumption by lowering power supplied to at least one of a panel processor and a display driver in an always-on display mode through a display device.

[0030] One aspect is that power consumption during the always-on display mode can be minimized by updating the image displayed through the always-on display mode based on user perception during the execution of the always-on display mode.

[0031] One aspect is that the display device can provide various information to the user through the always-on display mode by displaying information about the weather, date, time, as well as news, operation information of other home appliances, and schedule information of the user's device when in the always-on display mode.

[0032] One aspect is that the display device can induce user viewing by displaying broadcast program guide information and OTT (Over The Top) content information through the always-on display mode of the display device.

[0033] One aspect is that the brightness of the display panel can be maintained at a reference brightness while performing the constant display mode, thereby ensuring user visibility and preventing afterimages.

[0034] One aspect is that afterimages can be minimized by performing pixel shifting while performing the always-on display mode.

[0035] The present invention can improve the marketability of a display device, further increase user satisfaction, enhance user reliability, and secure product competitiveness.

[0036] FIG. 1 is an exemplary diagram of a home network system including a display device according to one embodiment.

[0037] Figure 2 is an exemplary diagram of a display device according to an embodiment.

[0038] FIG. 3 is an exemplary diagram of a display panel provided in a display device according to one embodiment.

[0039] FIG. 4 is an exemplary diagram of an organic light-emitting element provided in a display device according to an embodiment.

[0040] Figure 5 is a control configuration diagram of a display device according to an embodiment.

[0041] FIG. 6 is an exemplary diagram of a pixel driving circuit provided in a display device according to an embodiment.

[0042] Figure 7 is a detailed configuration diagram of a panel processor and a display driver of a display device according to an embodiment.

[0043] Figure 8 is a detailed configuration diagram of a first processor of a display device according to an embodiment.

[0044] FIG. 9 is an example diagram of a frame rate of an image displayed through a constant display mode of a display device according to an embodiment.

[0045] Figure 10 is a detailed configuration diagram of a second processor of a display device according to an embodiment.

[0046] Figure 11 is a table of power consumption of a display device according to an embodiment.

[0047] Fig. 12 is a control flowchart of a display device according to an embodiment.

[0048] Figure 13 is a power control table of the first and second processors, display driver, and display panel for each mode of a display device according to an embodiment.

[0049] FIG. 14a and FIG. 14b are exemplary diagrams of image display in the always-on display mode of a display device according to an embodiment.

[0050] It should be understood that the various embodiments and terms used in this document are not intended to limit the technical features described in this document to specific embodiments, but rather to include various modifications, equivalents, or substitutes of the embodiments.

[0051] In connection with the description of the drawings, similar reference numerals may be used for similar or related components.

[0052] The singular form of a noun corresponding to an item may include one or more items, unless the context clearly indicates otherwise.

[0053] In this document, each of the phrases "A or B", "at least one of A and B", "at least one of A or B", "A, B, or C", "at least one of A, B, and C", and "at least one of A, B, or C" may include any one of the items listed together in that phrase, or all possible combinations thereof.

[0054] Terms such as "first," "second," or "first" or "second" may be used simply to distinguish one component from another and do not limit the components in any other respect (e.g., importance or order).

[0055] When a component (e.g., a first component) is referred to as being "coupled" or "connected" to another component (e.g., a second component), with or without the terms "functionally" or "communicatively," it means that the component can be connected to the other component directly (e.g., wired), wirelessly, or through a third component.

[0056] The terms "include" or "have" are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in this document, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0057] When a component is said to be “connected,” “coupled,” “supported,” or “in contact with” another component, this includes not only cases where the components are directly connected, coupled, supported, or in contact, but also cases where the components are indirectly connected, coupled, supported, or in contact through a third component.

[0058] When we say that a component is "on" another component, this includes not only cases where the component is in contact with the other component, but also cases where there is another component between the two components.

[0059] The term "and / or" includes any combination of a plurality of related described elements or any one of a plurality of related described elements.

[0060] The operating principle and embodiments of the present invention will be described with reference to the attached drawings below.

[0061] FIG. 1 is a configuration diagram of a home network system (1) including a display device according to an embodiment.

[0062] The home appliance (10) may include a communication module capable of communicating with another home appliance, a user device (2), or a server (3), a user interface for receiving user input or outputting information to a user, at least one processor for controlling the operation of the home appliance (10), and at least one memory in which a program for controlling the operation of the home appliance (10) is stored.

[0063] The home appliance (10) may be at least one of various types of home appliances. For example, the home appliance (10) may include, but is not limited to, at least one of a refrigerator (11), a dishwasher (12), an electric range (13), an electric oven (14), an air conditioner (15), a clothes manager (16), a washing machine (17), a dryer (18), and a microwave oven (19) as illustrated, and may include various types of home appliances, such as a cleaning robot, a vacuum cleaner, and a display device (100) such as a television, which are not illustrated in the drawing. In addition, the home appliances mentioned above are merely examples, and in addition to the home appliances mentioned above, a device that is connected to another home appliance, a user device (2), or a server (3) and can perform the operations described below may be included in the home appliance (10) according to one embodiment.

[0064] The server (3) may include a communication module capable of communicating with another server, a home appliance (10), or a user device (2), at least one processor capable of processing data received from another server, a home appliance (10), or a user device (2), and at least one memory capable of storing a program for processing data or processed data. The server (3) may be implemented as various computing devices such as a workstation, a cloud, a data drive, or a data station. The server (3) may be implemented as one or more servers that are physically or logically separated based on function, detailed configuration of function, or data, and may transmit and receive data through communication between each server and process the transmitted and received data.

[0065] The server (3) can perform functions such as managing user accounts, registering home appliances (10) by linking them to user accounts, and managing or controlling registered home appliances (10). For example, a user can access the server (3) via a user device (2) and create a user account. The user account can be identified by an ID and password set by the user.

[0066] The server (3) can register a home appliance (10) to a user account according to a set procedure. For example, the server (3) can register, manage, and control the home appliance (10) by linking identification information (e.g., serial number or MAC address, etc.) of the home appliance (10) to a user account. The user device (2) may include a communication module capable of communicating with the home appliance (10) or the server (3), a user interface for receiving user input or outputting information to the user, at least one processor for controlling the operation of the user device (2), and at least one memory in which a program for controlling the operation of the user device (2) is stored.

[0067] The user device (2) may be carried by the user or placed in the user's home or office, etc. The user device (2) may include, but is not limited to, a personal computer (PC), a terminal, a portable telephone, a smart phone, a handheld device, a wearable device, a laptop, and a tablet PC.

[0068] A program for controlling a home appliance (10), i.e., an application, may be stored in the memory of the user device (2). The application may be sold installed in the user device (2) or downloaded and installed from an external server.

[0069] A user can access a server (3) by executing an application installed on a user device (2), create a user account, and communicate with the server (3) based on the logged-in user account to register a home appliance (10).

[0070] For example, when the home appliance (10) is operated so that the home appliance (10) can be connected to the server (3) according to the procedure guided by the application installed on the user device (2), the home appliance (10) can be registered in the user account by registering the identification information (e.g., serial number or MAC address) of the home appliance (10) in the corresponding user account on the server (3).

[0071] A user can control a home appliance (10) using an application installed on the user device (2). For example, when a user logs into a user account using an application installed on the user device (2), a home appliance (10) registered to the user account appears, and when a control command for the home appliance (10) is input, the control command can be transmitted to the home appliance (10) via the server (3).

[0072] A network can include both wired and wireless networks. Wired networks include cable networks or telephone networks, while wireless networks can include any network that transmits and receives signals via radio waves. Wired and wireless networks can be interconnected.

[0073] A network may include a wide area network (WAN) such as the Internet, a local area network (LAN) formed around an access point (AP), and a short-range wireless network that does not use an access point (AP). Short-range wireless networks may include, but are not limited to, Bluetooth™ (IEEE 802.15.1), Zigbee (IEEE 802.15.4), Wi-Fi Direct, Near Field Communication (NFC), Z-Wave, etc.

[0074] An access point (AP) can connect a home appliance (10) or a user device (2) to a wide area network (WAN) to which a server (3) is connected. The home appliance (10) or the user device (2) can be connected to the server (3) via the wide area network (WAN).

[0075] The access point (AP) can communicate with a home appliance (10) or user device (2) using wireless communication such as Wi-Fi (Wi-Fi™, IEEE 802.11), Bluetooth (Bluetooth™, IEEE 802.15.1), or Zigbee (IEEE 802.15.4), and can connect to a wide area network (WAN) using wired communication, but is not limited thereto.

[0076] According to various embodiments, the home appliance (10) may be directly connected to the user device (2) or server (3) without going through an access point (AP).

[0077] The home appliance (10) can be connected to a user device (2) or a server (3) via a long-distance wireless network or a short-distance wireless network.

[0078] For example, the home appliance (10) can be connected to the user device (2) via a short-range wireless network (e.g., Wi-Fi Direct).

[0079] As another example, the home appliance (10) may be connected to a user device (2) or a server (3) via a wide area network (WAN) using a long-distance wireless network (e.g., a cellular communication module).

[0080] As another example, a home appliance (10) can connect to a wide area network (WAN) using wired communication and be connected to a user device (2) or a server (3) through the wide area network (WAN).

[0081] If the home appliance (10) can connect to a wide area network (WAN) using wired communication, it can also act as a connection relay. Accordingly, the home appliance (10) can connect other home appliances to the wide area network (WAN) to which the server (3) is connected. In addition, other home appliances can connect the home appliance (10) to the wide area network (WAN) to which the server (3) is connected.

[0082] A home appliance (10) can transmit information about its operation or status to another home appliance, a user device (2), or a server (3) via a network. For example, the home appliance (10) can transmit information about its operation or status to another home appliance, a user device (2), or a server (3) when a request is received from a server (3), when a specific event occurs in the home appliance (10), or periodically or in real time.

[0083] When information about the operation or status is received from the home appliance (10), the server (3) can update the stored information about the operation or status of the home appliance (10) and transmit the updated information about the operation and status of the home appliance (10) to the user device (2) via the network. Here, the update of information can include various operations in which existing information is changed, such as an operation of adding new information to existing information and an operation of replacing existing information with new information.

[0084] The home appliance (10) can obtain various information from other home appliances, user devices (2), or servers (3), and provide the obtained information to the user. For example, the home appliance (10) can obtain information related to the functions of the home appliance (10) (e.g., cooking methods, washing instructions, display modes, etc.) and various environmental information (e.g., weather, temperature, humidity, etc.) from the server (3), and output the obtained information through a user interface.

[0085] The home appliance (10) can operate according to a control command received from another home appliance, a user device (2), or a server (3). For example, if the home appliance (10) has obtained prior approval from the user to operate according to a control command from the server (3) even without user input, the home appliance (10) can operate according to a control command received from the server (3). Here, the control command received from the server (3) may include, but is not limited to, a control command input by the user through the user device (2) or a control command based on preset conditions.

[0086] The user device (2) can transmit information about the user to the home appliance (10) or the server (3) via the communication module. For example, the user device (2) can transmit information about the user's location, the user's health status, the user's preferences, the user's schedule, etc. to the server (3). The user device (2) can transmit information about the user to the server (3) with the user's prior consent.

[0087] The home appliance (10), user device (2), or server (3) may determine a control command using technology such as artificial intelligence. For example, the server (3) may receive information regarding the operation or status of the home appliance (10) or information regarding the user of the user device (2), process the information using technology such as artificial intelligence, and transmit the processing result or control command to the home appliance (10) or user device (2) based on the processing result.

[0088] Figure 2 is an exemplary diagram of a display device according to an embodiment.

[0089] A display device (100) is a device that displays visual and three-dimensional image information, such as a display unit of a mobile device such as a laptop, a smart phone, a tablet, a monitor of a PC, a television, a display unit of a home appliance, a display unit in a vehicle, etc.

[0090] In this embodiment, a television among the display devices (100) is described.

[0091] As illustrated in FIG. 2, the display device (100) includes a main body (100a) forming an exterior, and a stand (100b) mounted on the lower portion of the main body (100a). This display device (100) can also be installed on a wall without a stand using a bracket or the like.

[0092] The display device (100) may include a display panel (100c) provided on the main body (100a) and displaying an image.

[0093] The main body (100a) may include a cover that covers the rear surface of the display panel (100c).

[0094] The main body (100a) may further include a bezel that covers the frame of the display panel (100c). In this case, the cover and bezel of the main body may be detachably coupled to each other.

[0095] Fig. 3 is an exemplary diagram of a display panel of a display device according to an embodiment, which will be described with reference to Fig. 4. Fig. 4 is an exemplary diagram of an organic light-emitting element provided in a display device according to an embodiment.

[0096] Among display devices, the display panel of an organic light-emitting diode (OLED)-based display device is described.

[0097] As illustrated in FIG. 3, the display panel (100c) of the display device (100) may include a base substrate (110), a driving substrate (120), an organic light-emitting substrate (130), an encapsulating substrate (140), and a polarizing plate (150).

[0098] The base substrate (110) may be a transparent insulating substrate made of glass, quartz, ceramic, etc. The base substrate (110) may be a transparent flexible substrate made of plastic, etc.

[0099] The driving substrate (120) can be provided on the base substrate (110).

[0100] The driving substrate (120) can be electrically and physically connected to the organic light emitting substrate (130).

[0101] The driving substrate (120) may include a thin film transistor (TFT) circuit board that transmits a driving signal for driving a plurality of organic light-emitting elements provided on an organic light-emitting substrate (130). The TFT circuit board may include a plurality of transistors and a plurality of capacitors.

[0102] Multiple transistors may be formed by oxides.

[0103] The organic light-emitting substrate (130) can display an image by emitting light according to a driving signal received from the driving substrate (120). The light generated from the organic light-emitting substrate (130) can be emitted to the outside through the sealing substrate (140).

[0104] As illustrated in FIG. 4, the organic light-emitting substrate (130) may include a first electrode (131), a second electrode (132), and a plurality of organic light-emitting elements (133).

[0105] The first electrode (131) and the second electrode (132) include at least one of a transparent conductive material and a semi-transparent metal.

[0106] The transparent conductive material includes at least one of ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), ZnO (Zinc Oxide), and In2O3 (Indium Oxide).

[0107] The semi-permeable metal may be a metal made of one or more of magnesium (Mg), silver (Ag), gold (Au), calcium (Ca), lithium (Li), chromium (Cr), and aluminum (Al), or an alloy thereof.

[0108] The first electrode (131) may be an anode electrode, which is a hole injection electrode, and the second electrode (132) may be a cathode electrode, which is an electron injection electrode.

[0109] Each organic light-emitting element (133) may include at least one of an emitting layer (EML), a hole-injection layer (HIL), a hole-transporting layer (HTL), an electron-transporting layer (ETL), and an electron-injection layer (EIL).

[0110] Among the aforementioned layers, the remaining layers except the light-emitting layer may be omitted as needed.

[0111] When each organic light-emitting element (133) includes all of the layers described above, a hole injection layer (HIL) may be placed on the first electrode (131), and a hole transport layer (HTL), an emission layer (EML), an electron transport layer (ETL), and an electron injection layer (EIL) may be sequentially stacked thereon.

[0112] The emitting layer (EML) may include an organic material. Various organic materials can be used, including copper phthalocyanine (CuPc), N,N-di(naphthalene-1-yl)-N,N'-diphenyl-benzidine (NPB), and tris-8-hydroxyquinoline aluminum (Alq3).

[0113] The organic light-emitting substrate (130) may further include a polarizing film (not shown) provided on the second electrode (132) and having a polarizing axis. The polarizing film can transmit light that is aligned with the polarizing axis and reflect light that is not aligned with the polarizing axis. Accordingly, light passing through the polarizing film can be linearly polarized in the direction of the polarizing axis of the polarizing film.

[0114] The encapsulating substrate (140) seals the organic light-emitting substrate (130) and the driving substrate (120).

[0115] The bag substrate (140) may be made of a glass substrate, a substrate made of various plastic materials such as acrylic, or a metal plate.

[0116] A polarizing plate (150) may be provided on the bag substrate (140). The polarizing plate (150) serves to block external light reflection.

[0117] The polarization axis of the polarizing plate (150) may be the same as the polarization axis of the polarizing film of the organic light-emitting element (130).

[0118] The polarizing plate (150) can also be provided between the encapsulation substrate (140) and the organic light-emitting substrate (130).

[0119] FIG. 5 is a control configuration diagram of a display device according to an embodiment, which is described with reference to FIGS. 6, 7, 8, 9, 10, and 11.

[0120] FIG. 6 is an exemplary diagram of a pixel driving circuit provided in a display device according to an embodiment, and FIG. 7 is a detailed configuration diagram of a panel processor and a display driver of a display device according to an embodiment.

[0121] FIG. 8 is a detailed configuration diagram of a first processor of a display device according to an embodiment, FIG. 9 is an exemplary diagram of a frame rate of an image displayed through a constant display mode of a display device according to an embodiment, and FIG. 10 is a detailed configuration diagram of a second processor of a display device according to an embodiment. FIG. 11 is a table of power consumption of a display device according to an embodiment.

[0122] As illustrated in FIG. 5, the display device (1) may include a display panel (100c), a display driver (160), an input unit (210), a communication unit (220), a power supply unit (230), a panel processor (240), and a memory (250).

[0123] The structural description of the display panel (100c) is described through FIGS. 3 and 4, and thus, the description is omitted here.

[0124] The display panel (100c) may include a plurality of pixels.

[0125] Each pixel may include a first sub-pixel, a second sub-pixel, and a third sub-pixel, wherein the first sub-pixel may correspond to a first organic light-emitting element that emits red light, the second sub-pixel may correspond to a second organic light-emitting element that emits green light, and the third sub-pixel may correspond to a third organic light-emitting element that emits blue light.

[0126] The display panel (100c) may include a plurality of pixel driving circuits (121) corresponding to each organic light-emitting element (133). The plurality of pixel driving circuits (121) may be provided on a driving substrate (120).

[0127] As illustrated in FIG. 6, each pixel driving circuit (121) may include a first transistor (T1), a second transistor (T2), and a capacitor (C).

[0128] The gate terminal of the first transistor (T1) can be connected to a scan line (SL), and the drain terminal of the first transistor (T1) can be connected to a data line (DL).

[0129] The source terminal of the first transistor (T1) can be connected to the gate terminal of the second transistor (T2).

[0130] A capacitor (C) may be provided between the gate terminal and the drain terminal of the second transistor (T2). An organic light-emitting element (133) may be connected to the source terminal of the second transistor (T2).

[0131] The drain terminal of the second transistor (T2) can be connected to the power line (VDD).

[0132] The data line (DL) may be a line through which the main power of the pixel driving circuit is supplied.

[0133] The scan line (SL) is a gate line that supplies current to the second transistor (T2).

[0134] Electrons can be stored in a capacitor (C) supplied with current by a second transistor (T2).

[0135] When the second transistor (T2) is turned on, current can flow to the organic light-emitting element (133).

[0136] The scan lines may be arranged to intersect with the data lines. In this case, the intersection of the scan lines and the data lines may become a subpixel.

[0137] Current flowing in the organic light-emitting element (133) means current flowing in the sub-pixel.

[0138] Each subpixel can emit light with a brightness corresponding to the amount of current flowing through the subpixel.

[0139] The pixel driving circuit is not limited to the pixel driving circuit illustrated in Fig. 6. That is, in addition to the pixel driving circuit structure illustrated in Fig. 6, it is also possible to implement a circuit with a structure of a different structure.

[0140] A display driver (160, DDI: Display Driver IC) can be connected to a display panel (100c).

[0141] The display driver (160) can receive a driving signal for displaying an image from the panel processor (240) and transmit the received driving signal to the display panel (100c).

[0142] The driving signal for displaying an image may include a scan signal and a data signal.

[0143] The display driver (160) may include a first driver (161) and a second driver (162).

[0144] The first driver (161) may include a data line (DL). The first driver (161) may be connected to a driving substrate (120) of a display panel (100c) via the data line (DL). The data line (DL) of the first driver (161) may be connected to a drain terminal of a first transistor (T1) of a pixel driving circuit (121).

[0145] The first driver (161) transmits a data signal to the driving substrate (120) of the display panel (100c) via a data line (DL), and can transmit the data signal to a plurality of pixel driving circuits of the driving substrate.

[0146] The data signal may be a signal that creates a difference in the color that the subpixels will express.

[0147] The first driver (161) may include a first display driver integrated circuit (DDI: Display Driver IC).

[0148] The first display driver integrated circuit is also called a source driver integrated circuit.

[0149] The second driver (162) may include a scan line (SL). The second driver (162) may be connected to the driving substrate (120) of the display panel (100c) via the scan line (SL).

[0150] The scan line (SL) of the second driver (162) can be connected to the gate terminal of the first transistor (T1) of the pixel driving circuit (121).

[0151] The second driver (162) transmits a scan signal to the driving substrate (120) of the display panel (100c) through a scan line (SL), and can transmit the scan signal to a plurality of pixel driving circuits of the driving substrate.

[0152] The second driver (162) may include a second display driver integrated circuit (DDI: Display Driver IC).

[0153] The second display driver integrated circuit is also called a gate driver integrated circuit.

[0154] The first driver (161) can maintain the power supplied to the first driver (161) while performing the normal display mode, and can lower the power supplied to the first driver (161) based on whether it is in the blank mode among the constant display modes.

[0155] Normal display mode is a mode that displays images received from an external device in real time, and may be a mode that displays videos.

[0156] Always-on display mode is a mode that displays a still image while in sleep mode.

[0157] The second driver (162) can maintain the power supplied to the second driver (162) while performing the normal display mode, and can reduce the power supplied to the second driver (162) based on whether it is in the blank mode among the constant display modes.

[0158] Blank mode may be a mode in which transmission of video frames for still images is stopped, or a mode in which a black image is displayed.

[0159] The first and second drivers (161, 162) with power down can apply a reference voltage to the thin film transistors. Through this, the display device can improve visibility in the always-on display mode while minimizing the occurrence of afterimages on the display panel.

[0160] The reference voltage may be a voltage corresponding to a reference luminance. The reference luminance may be a luminance of any one of 40 to 100 nits.

[0161] As the voltage applied to multiple pixels of a display panel increases, the amount of current increases, which increases the brightness and temperature of the pixels, which may cause the pixels to deteriorate and cause afterimages.

[0162] Accordingly, the first and second drivers (161, 162) can perform a constant display mode at a reference brightness that can minimize the occurrence of afterimages and ensure visibility.

[0163] The thin film transistors of the driving substrate of the display panel (100c) are thin film transistors formed of oxide, and can maintain image data for a longer time in blank mode than thin film transistors formed of other materials.

[0164] The power of the display driver (160) can also be controlled by the panel processor (240).

[0165] The display driver (160) includes a power controller (not shown), and can also control the power supplied to various components of the first and second drivers (161, 162) through the power controller.

[0166] The input unit (210) can receive user input.

[0167] User input may include a command to switch from sleep mode to wake-up mode, or a command to switch from normal mode to sleep mode.

[0168] User input may include selection information of an external device and selection information of content.

[0169] User input may include on and off information regarding whether the always-on display mode is running, selection information for an image to be displayed in the always-on display mode, and selection information for a notification to be displayed in the always-on display mode.

[0170] The images to be displayed in always-on display mode can include still images, photos, emoticons, etc.

[0171] Notifications can include notifications for home appliance events, news notifications, schedule notifications, new content notifications, broadcast program notifications, etc.

[0172] The user input may include on and off information regarding whether the user recognition mode is running, and may further include on and off information regarding whether the voice recognition mode is running.

[0173] More specifically, the input unit (210) can receive selection information of an external device for communication connection with the display device (1).

[0174] External devices may include set-top boxes, user devices, and removable storage devices (e.g., USB memory, external hard drive, etc.).

[0175] The input unit (210) can receive selection information of at least one content among a plurality of contents.

[0176] The plurality of contents may include multiple contents received via a set-top box, multiple contents received via a user device, and multiple contents received via a removable storage device.

[0177] The input unit (210) can receive setting information of the panel protection menu.

[0178] The panel protection menu may include a pixel shift menu. Configuration information for the pixel shift menu may include pixel shift on and pixel shift off information. The pixel shift menu, when set to pixel shift on, displays an image by shifting pixels at regular intervals.

[0179] The input unit (210) may include a tact switch, a push switch, a slide switch, a toggle switch, a micro switch, a touch switch, a touch pad, a touch screen, a jog dial, and / or a microphone.

[0180] The input unit (210) may include a remote controller that wirelessly communicates with the display device (100).

[0181] The communication unit (220) can communicate with an external device. The communication unit (220) can transmit image information received from the external device with which it is communicating to the panel processor (240).

[0182] External devices may include user devices, home appliances, servers, set-top boxes, and removable storage devices.

[0183] The communication unit (220) may include at least one of a short-range communication module or a long-range communication module.

[0184] The communication unit (220) can transmit data to an external device or receive data from an external device. For example, the communication unit (220) can establish communication with an external device and transmit and receive various types of data.

[0185] To this end, the communication unit (220) can support the establishment of a direct (e.g. wired) communication channel or wireless communication channel between external devices, and the performance of communication through the established communication channel.

[0186] According to one embodiment, the communication unit (220) may include a wireless communication module (e.g., a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module) or a wired communication module (e.g., a local area network (LAN) communication module, or a power line communication module).

[0187] These communication units (220) can communicate with external devices via a first network (e.g., a short-range communication network such as Bluetooth, WiFi (wireless fidelity) direct, or IrDA (infrared data association)) or a second network (e.g., a long-range communication network such as a legacy cellular network, a 5G network, a next-generation communication network, the Internet, or a computer network (e.g., a LAN or WAN)). These various types of communication modules can be integrated into a single component (e.g., a single chip) or implemented as a plurality of separate components (e.g., multiple chips).

[0188] The short-range wireless communication module may include, but is not limited to, a Bluetooth communication module, a BLE (Bluetooth Low Energy) communication module, a near field communication module, a WLAN (Wi-Fi) communication module, a Zigbee communication module, an infrared (IrDA, infrared Data Association) communication module, a WFD (Wi-Fi Direct) communication module, an UWB (ultrawideband) communication module, an Ant+ communication module, a microwave (uWave) communication module, etc.

[0189] The power supply unit (230) can receive external commercial power, convert the received commercial power into power, voltage, and current required for the operation of various components provided in the display device, and transmit the converted power, voltage, and current to the various components.

[0190] The power supply unit (230) can supply power to the input unit (210), communication unit (220), panel processor (240), and display panel (100c).

[0191] The panel processor (240) can control the overall operation of the display device.

[0192] The panel processor (240) can control wake-up based on user input received through the input unit (210) while performing sleep mode, and then control switching to normal display mode.

[0193] The panel processor (240) converts an image signal received from an external device into a pixel-by-pixel driving signal based on the normal display mode and transmits the converted pixel-by-pixel driving signal to the display driver (160).

[0194] The pixel-specific drive signal may include a pixel-specific voltage signal.

[0195] The panel processor (240) can control switching to sleep mode based on user input received through the input unit (210) while performing normal display mode.

[0196] The panel processor (240) can determine whether to perform the always-on display mode based on whether the always-on display mode is set after switching to the sleep mode.

[0197] The panel processor (240) can acquire an image for the constant display mode based on the setting-on information of the constant display mode and transmit an image signal for the acquired image to the display driver (160).

[0198] The panel processor (240) can determine the entry point into the update mode while performing the constant display mode, and transmit an image signal for the update image to the display driver (160) based on what is determined as the entry point into the update mode.

[0199] The panel processor (240) can determine the entry point into the blank mode while performing the constant display mode, and control the performance of the blank mode based on what is determined as the entry point into the blank mode.

[0200] The panel processor (240) can reduce power consumption in the constant display mode by lowering the power supplied to the panel processor (240) and the display driver (160) in the constant display mode or by lowering the frequency for the frame rate in the constant display mode compared to the frequency for the frame rate in the normal display mode.

[0201] Normal display mode Constant display mode Frequency power control for frame rate Frequency power control for frame rate 120Hz hold 120Hz down 120Hz hold 60Hz hold 120Hz hold 60Hz down 60Hz hold 60Hz down

[0202] Refer to Table 1 above to explain power control by mode in more detail.

[0203] The panel processor (240) can transmit a video signal to the display driver (160) at the first frame rate when performing the normal display mode and maintain the power supplied to the panel processor (240) and the display driver (160), transmit a video signal to the display driver (160) at the first frame rate when performing the always-on display mode and reduce the power supplied to the panel processor (240) and the display driver (160), and restore the power supplied to the panel processor (240) and the display driver (160) and transmit a video signal to the display driver (160) at the first frame rate when performing the update mode. In this case, the frequency corresponding to the first frame rate may be 120 Hz.

[0204] The panel processor (240) can transmit a video signal to the display driver (160) at a second frame rate when performing a normal display mode and maintain power supplied to the panel processor (240) and the display driver (160), transmit a video signal to the display driver (160) at a second frame rate when performing a constant display mode and reduce power supplied to the panel processor (240) and the display driver (160), and restore power supplied to the panel processor (240) and the display driver (160) when performing an update mode and transmit a video signal to the display driver (160) at a second frame rate. In this case, the frequency corresponding to the second frame rate may be 60 Hz.

[0205] When the frequency of the frame rate of the normal display mode and the constant display mode is the same, the panel processor (240) can reduce the power consumed in the constant display mode by lowering the power supplied to the panel processor (240) and the display driver (160) in the constant display mode.

[0206] The panel processor (240) can transmit a video signal to the display driver (160) at a first frame rate when performing a normal display mode and maintain power supplied to the panel processor (240) and the display driver (160), and can transmit a video signal to the display driver (160) at a second frame rate when performing a constant display mode and maintain power supplied to the panel processor (240) and the display driver (160). The first frequency can be 120 Hz and the second frequency can be 60 Hz.

[0207] The panel processor (240) can reduce power consumption in constant display mode simply by lowering the frequency of the frame rate.

[0208] The panel processor (240) may transmit a video signal to the display driver (160) at a first frame rate when performing a normal display mode and maintain power supplied to the panel processor (240) and the display driver (160), and may transmit a video signal to the display driver (160) at a second frame rate when performing a constant display mode and reduce power supplied to the panel processor (240) and the display driver (160). The frequency corresponding to the first frame rate may be 120 Hz, and the frequency corresponding to the second frame rate may be 60 Hz.

[0209] The panel processor (240) can minimize power consumption in the always-on display mode by lowering the frequency of the frame rate and lowering the power in the always-on display mode.

[0210] The panel processor (240) can transmit a video signal to the display driver (160) at a third frame rate based on what is determined as the entry point into the blank mode among the constant display modes.

[0211] The frequency corresponding to the third frame rate may be 1 Hz or 0.1 Hz.

[0212] The display device (100) may further include a human body detection sensor (not shown).

[0213] The human body detection sensor may include, but is not limited to, a thermal infrared sensor, a motion sensor, and a microphone, and may include various sensors capable of detecting a human body.

[0214] The panel processor (240) can also recognize a user based on information received from a human body detection sensor (not shown) while performing the constant display mode and perform the update mode based on determining that the user has been recognized.

[0215] The panel processor (240) can also control the power supply (230) so that power is supplied to the human body detection sensor while the constant display mode is being performed.

[0216] The panel processor (240) can recognize a voice received through a microphone while performing the constant display mode, identify a user based on the recognized voice, obtain notification information selected by the identified user, and control an update mode based on the obtained notification information.

[0217] When a motion is recognized while performing the constant display mode, the panel processor (240) can obtain notification information corresponding to the recognized motion and control the update mode based on the obtained notification information.

[0218] The panel processor (240) maintains power supplied to the communication unit (230) while performing the constant display mode, determines that when event information is received from the home appliance (10) through the communication unit (230), it is the time to enter the update mode, controls the performance of the update mode, and controls the display panel so that an image corresponding to the event information is displayed as an image in the constant display mode when performing the update mode.

[0219] The panel processor (240) can maintain power supplied to the communication unit (230) while performing the constant display mode, and can also recognize the presence of a user when a communication signal from the user device (2) is received through the communication unit (230). In this case, the panel processor (240) can determine the entry point into the update mode based on the determination that the user has been recognized, control the execution of the update mode, and update the image displayed in the constant display mode through the update mode.

[0220] The panel processor (240) can maintain power supplied to the communication unit (230) while performing the constant display mode, determine when content information is received through the communication unit (230) as the entry point into the update mode, control the performance of the update mode, and control the display panel so that an image corresponding to the content information is displayed as an image in the constant display mode when performing the update mode.

[0221] The panel processor (240) can perform the above-described operation using data stored in the memory (250).

[0222] The panel processor (240) may include hardware such as a CPU or memory, and software such as a control program. For example, the panel processor (240) may include one or more processor chips that perform the aforementioned operations using an algorithm for controlling the operations of components within the display device, at least one memory that stores program-type data, and data stored in the at least one memory, or may include one or more processing cores.

[0223] The panel processor (240) may include a separate NPU that performs the operation of the artificial intelligence model, and may include a graphics-only processor (GPU), etc.

[0224] The memory (250) can store information about an image to be displayed when the constant display mode is performed. The image stored in the memory (250) is an image selected by the user and may include a still image.

[0225] The memory (250) can also store information about notifications to be displayed when the always-on display mode is performed. The notifications stored in the memory (250) are notifications selected by the user and may include still images.

[0226] The image to be displayed when performing the always-on display mode and the notification to be displayed when performing the always-on display mode are collectively referred to as still images.

[0227] The memory (250) can also store information about the update cycle of a still image to be displayed when performing the constant display mode.

[0228] The memory (250) can store data for an algorithm for controlling the operation of components within the display device or a program that reproduces the algorithm.

[0229] The memory (250) and the panel processor (240) may be implemented as separate chips. Alternatively, the memory (250) and the panel processor (240) may be implemented as a single chip.

[0230] The memory (250) may be implemented as at least one of a non-volatile memory element such as a cache, a ROM (Read Only Memory), a PROM (Programmable ROM), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), and a flash memory, a volatile memory element such as a RAM (Random Access Memory), or a storage medium such as a hard disk drive (HDD) or a CD-ROM, but is not limited thereto.

[0231] Hereinafter, the specific control configuration of the panel processor (240) will be described by dividing it into a control configuration performed by the first processor (241) and a control configuration performed by the second processor (242).

[0232] As illustrated in FIG. 7, the panel processor (240) may include a first processor (241) and a second processor (242).

[0233] The first processor (241) may be an application processor (AP).

[0234] The first processor (241) can transmit user input received through the input unit (210) to the second processor (242).

[0235] The user input may include selection information for any one of normal display mode, sleep mode, always-on display mode, voice recognition mode, and user recognition mode.

[0236] The first processor (241) can also transmit information about the frame rate for outputting image data in each of the normal display mode, constant display mode, update mode, and blank mode to the second processor (242).

[0237] The first processor (241) can determine the entry point into the update mode and blank mode and transmit mode entry information about the determined entry point into the blank mode and update mode to the second processor (242).

[0238] The first processor (241) can determine the point of entry into the blank mode based on the completion of transmission of the image to be displayed in the constant display mode.

[0239] The first processor (241) can receive an image signal from an external device based on the performance of the normal display mode and transmit the received image signal to the second processor (242).

[0240] The external device may include at least one of a server, a user device, a home appliance, a set-top box, and a removable storage device.

[0241] The first processor (241) can signal process the received image signal.

[0242] The first processor (241) can encode image data corresponding to the received image signal in a specified manner and transmit the encoded image to the second processor (242).

[0243] The first processor (241) can determine whether the always-on display mode is set based on entering the sleep mode, and can transmit a still image to the second processor (242) based on determining that the always-on display mode is set.

[0244] The first processor (241) can transmit an image signal for an image to be displayed in the constant display mode to the second processor (242) based on the performance of the constant display mode. The image may be an image selected by the user.

[0245] The first processor (241) can transmit information about notifications to be displayed in the always-on display mode to the second processor (242). The information about the notifications can include at least one of OTT content information, broadcast program information, news information, user schedule information, home appliance operation information, and home appliance event information.

[0246] The first processor (241) can determine whether it is time to enter the update mode while performing the constant display mode and transmit a video signal for the update video to the second processor (242) based on what is determined to be the time to enter the update mode.

[0247] The first processor (241) can determine whether it is time to enter the blank mode while performing the constant display mode, and transmit the third frame rate to the second processor (242) based on what is determined as the time to enter the blank mode.

[0248] The first processor (241) can lower the power applied to the components within the first processor (241) based on entering the blank mode while performing the constant display mode, and can restore the power applied to the components within the first processor (241) based on entering the update mode while performing the constant display mode.

[0249] The first processor (241) can determine the entry point into the update mode based on user recognition while performing the constant display mode.

[0250] As shown in FIG. 8, the first processor (241) may include a central processing unit (241a), a graphics processing unit (241b), a display controller (241c), an encoder (241d), a first communication interface (241e), and a first power controller (241f) based on receiving event information from an external device.

[0251] The central processing unit (CPU, 241a) can control the overall operation of the first processor (241). In particular, the central processing unit (241a) can also perform the function of a graphics processing unit (241b).

[0252] A graphics processing unit (GPU, 241b) can perform image processing on an image output to a display panel (100c) and transmit image data for the processed image to a display controller (241c).

[0253] The display controller (241c) can control the display driver (160).

[0254] The display controller (241c) can generate image data to be transmitted to the display driver (160) based on the received image data. For example, the display controller (241c) can generate image data based on a first frame rate based on a normal display mode, and can generate image data based on a second frame rate based on a constant display mode.

[0255] The frequency corresponding to the first frame rate is described as the first frequency, and the frequency corresponding to the second frame rate is described as the second frequency.

[0256] The first frequency may be higher than the second frequency. For example, the first frequency may be 120 Hz and the second frequency may be 60 Hz.

[0257] The display controller (241c) can also generate image data based on the third frame rate based on entry into blank mode.

[0258] The frequency corresponding to the third frame rate is described as the third frequency.

[0259] The third frequency may be a lower frequency than the first and second frequencies. For example, the third frequency may be 1 Hz or 0.1 Hz.

[0260] The encoder (241d) can encode image data transmitted from the first processor (241) to the display driver (160).

[0261] The encoder (241d) can encode video data in a pre-specified manner.

[0262] Through this, the image data generated by the display controller (241c) is compressed, and the power supplied to the display (241a), the graphics processing unit (241b), the display controller (241c), the encoder (241d), and the first communication interface (241e) is turned off, and the power supplied to the central processing unit (241a), the graphics processing unit (241b), the display controller (241c), the encoder (241d), and the first communication interface (241e) is turned on based on the entry into the update mode.

[0263] Turning off power may include cutting off power.

[0264] The point in time at which power supplied to the central processing unit (241a), the graphic processing unit (241b), the display controller (241c), the encoder (241d), and the first communication interface (241e) is turned off based on the entry into the always-on display mode may be the point in time at which the blank mode is entered.

[0265] The point of entry into blank mode may be the point of completion of transmission of the image to be displayed in the always-on display mode.

[0266] The first power controller (241f) can determine the entry point into the update mode while performing the constant display mode, and based on the point determined as the entry point into the update mode, can control the wake-up of the central processing unit (241a), the graphic processing unit (241b), the display controller (241c), the encoder (241d), and the first communication interface (241e).

[0267] When performing the constant display mode, only the power supplied to the first power controller (241f) is turned on, and the power supplied to the central processing unit (241a), the graphic processing unit (241b), the display controller (241c), the encoder (241d), and the first communication interface (241e) is turned off, so that the power supplied to the first processor (241) when performing the constant display mode can be lowered compared to the power supplied when performing the normal display mode.

[0268] When the update mode is performed, the power supplied to the central processing unit (241a), the graphic processing unit (241b), the display controller (241c), the encoder (241d), the first communication interface (241e), and the first power controller (241f) is turned on, so the first processor (241) can be restored to the power of the normal display mode when the update mode is performed.

[0269] The second processor (242) can receive an image signal from the first processor (241), convert the received image signal into a driving signal, and transmit the converted driving signal to the display driver (160).

[0270] The drive signal may include a data signal and a scan signal.

[0271] The drive signal may include a voltage signal.

[0272] The second processor (242) can process the received image signal and transmit the processed image data to the display driver (160) at the received frame rate.

[0273] The second processor (242) can generate a data signal based on the received image signal and transmit the generated data signal to the first driver (161), and can generate a scan signal based on the received image signal and transmit the generated scan signal to the second driver (162).

[0274] The second processor (242) can receive a display mode from the first processor.

[0275] The second processor (242) can control the display of an image in a normal display mode based on the fact that the received display mode is a normal display mode, control the display of an image in a constant display mode based on the fact that the received display mode is a constant display mode, and update the image displayed in the constant display mode based on the fact that the received display mode is an update mode.

[0276] The second processor (242) can receive a frame rate for each mode for image output from the first processor (141) and transmit the received frame rate for each mode to the display driver (160).

[0277] The frame rates in normal display mode and always-on display mode may be the same or different.

[0278] More specifically, the second processor (242) can display an image at a first frame rate based on the performance of the normal display mode, and can display an image at a first frame rate based on the performance of the constant display mode.

[0279] The second processor (242) can display an image at a second frame rate based on the performance of the normal display mode, and can display an image at a second frame rate based on the performance of the constant display mode.

[0280] The second processor (242) can display an image at a first frame rate based on the performance of the normal display mode, and can display an image at a second frame rate based on the performance of the constant display mode.

[0281] The frame rates in constant display mode and blank mode may be different, and the frame rates in constant display mode and update mode may be the same.

[0282] As illustrated in FIG. 9, the second processor (242) can display an image at a second frequency corresponding to a second frame rate based on the performance of the constant display mode, can display an image at a third frequency corresponding to a third frame rate based on the performance of the blank mode, and can display an image at a second frequency corresponding to a second frame rate based on the performance of the update mode.

[0283] The second processor (242) can turn on the power supplied to various components provided in the second processor (242) based on the performance of the normal display mode.

[0284] Turning on the power supplied to the various components provided in the second processor (242) may include supplying each of the power required to operate the various components provided in the second processor (242).

[0285] The second processor (242) can lower the power applied to the components within the second processor (242) based on the entry into the blank mode while performing the constant display mode, and can restore the power applied to the components within the second processor (242) based on the entry into the update mode while performing the constant display mode.

[0286] Restoring power supplied to components within the second processor (242) may include increasing power supplied to components within the second processor (242) by the amount of power that was turned off.

[0287] Information about entering update mode can be received from the first processor (241).

[0288] The second processor (242) can control the power supplied to the display driver (160) based on the performance of the normal display mode.

[0289] The second processor (242) can lower the power applied to the display driver (160) based on entry into the blank mode while performing the constant display mode, and can restore the power applied to the display driver (160) based on entry into the update mode while performing the constant display mode.

[0290] The second processor (242) can be powered down simultaneously with the first processor (241) based on the performance of the constant display mode.

[0291] The second processor (242) can turn down the power of the second processor after a preset time has elapsed from the time when the power of the first processor (241) is turned down based on the performance of the constant display mode.

[0292]

[0293] As illustrated in FIG. 10, the second processor (242) may include a second communication interface (242a), a communication controller (242b), a memory controller (242c), a low-power memory (242d), a decoder (242e), a scaler (242f), an image processing device (242g), a timing controller (242h), and a second power controller (242i).

[0294] The second communication interface (242a) can receive a video signal from the first communication interface of the first processor.

[0295] The second communication interface (242a) can receive user input from the first communication interface of the first processor.

[0296] The second communication interface (242a) may include a physical communication terminal.

[0297] The second communication interface (242a) can perform Vx1 and USB communication.

[0298] The communication controller (242b) can interface signals and image data transmitted or received between the first processor and the display driver (160).

[0299] The communication controller (242b) can transmit a video signal transmitted from the first processor to the memory controller (242c) and can transmit a user input transmitted from the first processor to the timing controller.

[0300] User input may include a command to enter sleep mode, a command to enter normal display mode, a command to set constant display mode, etc.

[0301] The communication controller (242b) can transmit a control command transmitted from the first processor (241) to the timing controller. The control command can include a command to enter an update mode and a command to enter a constant display mode.

[0302] When a command controller is provided in the second processor, the command controller can receive at least one of a user input and a control signal and transmit at least one of the received user input and control signals to the timing controller (242h).

[0303] The memory controller (242c) can control an operation of receiving an image signal transmitted from a communication controller (242b) and writing image data for the received image signal to a low-power memory (242d).

[0304] The memory controller (242c) can control an operation of recording image data into a low-power memory (242d) based on the received frame rate.

[0305] The low-power memory (242d) can store image data transmitted from the memory controller (242c) based on a control signal of the memory controller (242c).

[0306] The image data may include image data for a still image or image data for a moving image to be displayed when performing normal display mode.

[0307] The image data may include image data for a still image displayed when performing the always-on display mode.

[0308] The low-power memory (242d) can store image data at the received frame rate. The stored image data may include image data compressed by encoding or uncompressed image data.

[0309] The low-power memory (242d) may have different update frequencies or speeds depending on the type of image displayed on the display panel (100c). For example, when playing a video, the low-power memory (242d) may record image data corresponding to frames of the video at a specified speed. In the case of a still image, the low-power memory (242d) may store the still image until the still image is updated.

[0310] Image data stored in the low-power memory (242d) can be transmitted to the decoder (242e).

[0311] The decoder (242e) can decode the received image data and transmit the decoded image data to the timing controller (242h).

[0312] When uncompressed image data is received from the first processor, the low-power memory can transmit the stored image data to the timing controller (242h).

[0313] When a scaler and an image processing device are provided, the decoder (242e) can transmit decoded image data to the scaler (242f). In this case, the scaler (scalar, 242f) can enlarge the decoded image by a specified magnification.

[0314] The scaler (scalar, 242f) is an upscaler that can increase the number of pixels included in image data. For example, the scaler (242f) can increase the number of pixels included in an HD (High Definition) image to the number of pixels corresponding to an FHD (Full HD) image.

[0315] The image processing device (242g) can process image data and transmit the processed image data to the timing controller (242h).

[0316] The image processing device (242g) can improve the image quality of image data. For example, the image processing device (242g) may include a pixel data processing circuit, a pre-processing circuit, and a gating circuit.

[0317] The timing controller (242h) can supply a synchronizing signal or a clock signal to the display driver (160). In addition, the timing controller (242h) can also transmit a read command (RCMD) for a read operation of the low-power memory (242d) to the memory controller (242c).

[0318] A synchronization signal or clock signal supplied from a timing controller (242h) can be used for a tearing effect (TE: Tearing Effect) output. Image data can be synchronized to the TE signal, and the synchronized image data can be transmitted to the display driver (160).

[0319] The timing controller (242h) can control the sequential shifting of image-processed image data. The shifted image data can be output from the display panel (100c) via the first driver (161).

[0320] The timing controller (242h) can control the operation timing of each component provided in the second processor (242).

[0321] For example, the timing controller (242h) can control the timing of storing image data corresponding to an image signal received from the first processor (241) in the low-power memory (242d) and the timing of reading the image data stored in the low-power memory (242d) so that they do not overlap each other.

[0322] The timing controller (242h) can control the timing of reading image data stored in the low-power memory (242d) at a specified frame rate and transmitting it to the decoder (242e) and scaler (242f).

[0323] The timing controller (242h) can transmit image data received from the image processing device (242g) to the first driver (161) and control the output of the scan signal of the second driver (162).

[0324] The timing controller (242h) may include a dynamic frame frequency controller (DFFC) that converts the received frame rate to a frequency corresponding to the received frame rate.

[0325] A dynamic frame frequency controller (not shown) can determine the frame rate of image data stored in low-power memory (242d).

[0326] A dynamic frame frequency controller (not shown) receives information related to a frame rate from a second communication interface (242a), and can control the read speed of image data stored in a low-power memory (242d) and the output speed of image data based on the received information related to the frame rate and the timing signal.

[0327] The timing controller (242h) can switch between sleep mode and constant display mode based on a control signal of the first processor (241) while performing normal display mode, and can be woken up by the second power controller (242h) while performing sleep mode.

[0328] The timing controller (242h) can be woken up by the second power controller (242h) while performing the constant display mode and control the update mode, and can switch to the constant display mode based on a control signal of the first processor (241) while performing the update mode.

[0329] The second power controller (242i) may be a part of the power supply unit (230). The second power controller (242i) may also receive power from the power supply unit (230).

[0330] The second power controller (242i) can receive power from the power supply unit (230) while performing normal display mode, sleep mode, constant display mode, update mode, and blank mode.

[0331] The second power controller (242i) supplies power required to drive components of the second processor (242), namely, the second communication interface (242a), the communication controller (242b), the memory controller (242c), the low-power memory (242d), the decoder (242e), the scaler (242f), the image processing device (242g), and the timing controller (242h), based on the performance of the normal mode.

[0332] The second power controller (242i) can turn off the power supplied to the second communication interface (242a), the communication controller (242b), the memory controller (242c), the low-power memory (242d), the decoder (242e), the scaler (242f), the image processing device (242g), and the timing controller (242h) at the time of entering the always-on display mode.

[0333] Power off here may include power cut.

[0334] When the constant display mode is performed, only the power supplied to the second power controller (242i) is turned on, and the power supplied to the second communication interface (242a), the communication controller (242b), the memory controller (242c), the low-power memory (242d), the decoder (242e), the scaler (242f), the image processing device (242g), and the timing controller (242h) is turned off. Therefore, the total power supplied to the second processor (242) when the constant display mode is performed can be lowered compared to the total power supplied when the normal display mode is performed.

[0335] The second power controller (242i) can maintain the power supplied to the second power controller (242i) at the time of entering the constant display mode, and can also reduce the power supplied to the second power controller (242i) at the time of entering the blank mode during the execution of the constant display mode. Through this, the power consumed by the second processor (242) can be minimized when the constant display mode is executed.

[0336] The second power controller (242i) can maintain the power supplied to the second power controller (242i) at the time of entering the constant display mode, and can also lower the power supplied to the second power controller (242i) at the time of completing the self-refresh function using the low-power memory.

[0337] In this case, the low-power memory (242c) of the second processor (242) can transmit stored image data to the display driver (160) through a self-refresh function, and can display a still image through the display panel (100c) for a certain period of time.

[0338] The second power controller (242i) can turn on the power supplied to the second communication interface (242a), the communication controller (242b), the memory controller (242c), the low-power memory (242d), the decoder (242e), the scaler (242f), the image processing device (242g), and the timing controller (242h) at the time of entering the update mode.

[0339] When the update mode is performed, the power supplied to the second communication interface (242a), the communication controller (242b), the memory controller (242c), the low-power memory (242d), the decoder (242e), the scaler (242f), the image processing device (242g), and the timing controller (242h) is turned on, so that the power supplied to the second processor (242) when the update mode is performed can be restored to the power supplied in the normal display mode.

[0340] The second power controller (242i) can control the wake-up of the second communication interface (242a), the communication controller (242b), the memory controller (242c), the low-power memory (242d), the decoder (242e), the scaler (242f), the image processing device (242g), and the timing controller (242h) based on what is determined as the entry point into the update mode.

[0341] The second power controller (242i) can supply reference power to the display driver (160) during blank mode execution to enable the display panel (100c) to operate at a preset reference brightness.

[0342] In the case of the display driver (160), the power supplied to the display driver (160) may be maintained before entering the blank mode, and the power supplied to the display driver (160) may be reduced to the reference power after entering the blank mode.

[0343] Supplying the reference power to the display driver (160) includes supplying the minimum power required to maintain operation to the power terminals (VDD, VSS, Gate off, etc.) of the thin film transistor. Here, the minimum power required to maintain operation of the thin film transistor may be information obtained through testing and stored in advance.

[0344] The second power controller (242i) can restore power supplied to the second power controller (242i) based on entry into the update mode.

[0345] The configuration for power control of the second processor and display driver in always-on display mode is shown in the table below.

[0346] Second processor, display driver, second power controller, remaining components, always-on display mode, power on before entering blank mode, power off, power on after entering blank mode, reduced to baseline power, power off, reduced to baseline power

[0347] Figure 11 is a table of power consumption of a display device according to an embodiment.

[0348] More specifically, FIG. 11 is a table showing the amount of power consumed and the total amount of power consumed by the power supply (230), the first and second processors (241, 242), and the display panel (100c) when outputting an image at the second frame rate in the constant display mode, the amount of power consumed and the total amount of power consumed by the power supply (230), the first and second processors (241, 242), and the display panel (100c) when outputting an image at the third frame rate, and the amount of power consumed and the total amount of power consumed by the power supply (230), the first and second processors (241, 242), and the display panel (100c) when outputting an image at the third frame rate and reducing the power supplied to the power supply (230), the first and second processors (241, 242).

[0349] As shown in Fig. 11, it can be seen that when the frame rate for outputting an image is reduced, the power consumption is reduced, and when the frame rate for outputting an image is reduced and the power is lowered, the power consumption is further reduced.

[0350] At least one component may be added or deleted to correspond to the performance of the components of the display devices illustrated in FIGS. 4, 5, 8, and 10. Furthermore, it will be readily apparent to those skilled in the art that the relative positions of the components may be altered to correspond to the performance or structure of the system.

[0351] Meanwhile, each component illustrated in FIGS. 4, 5, 8, and 10 refers to software and / or hardware components such as Field Programmable Gate Array (FPGA) and Application Specific Integrated Circuit (ASIC).

[0352] Fig. 12 is a control flowchart of a display device according to an embodiment, which is described with reference to Figs. 13 and 14a and 14b.

[0353] Fig. 13 is a power control table of the first and second processors (241, 242), display driver (160), and display panel (100c) for each mode of a display device according to an embodiment.

[0354] FIG. 14a and FIG. 14b are exemplary diagrams of image display in the always-on display mode of a display device according to an embodiment.

[0355] The display device can output images based on a first frame rate or a second frame rate while performing normal display mode.

[0356] The frequency corresponding to the first frame rate may be a higher frequency than the frequency corresponding to the second frame rate.

[0357] As illustrated in FIG. 13, the display device can supply set power to each of the first processor (241), the second processor (242), the display driver (160), and the display panel (100c) while performing normal display mode.

[0358] In normal display mode, the set power supplied to each of the first processor (241), the second processor (242), the display driver (160), and the display panel (100c) may be the same or different.

[0359] The display device can determine whether a sleep mode command has been received while performing normal display mode (301), and can switch from the normal display mode to the sleep mode based on determining that a sleep mode command has been received.

[0360] The display device can determine whether the always-on display mode is set based on the transition to sleep mode (302).

[0361] The display device can control non-performance of the always-on display mode based on the setting information of the always-on display mode being off information.

[0362] The display device can control the performance of the always-on display mode based on whether the setting information of the always-on display mode is on information.

[0363] The display device can display a still image through the display panel based on controlling the performance of the always-on display mode (303).

[0364] Controlling the performance of the constant display mode includes transmitting a still image stored in the first processor (241) to the second processor (242) at the time of entry into the constant display mode.

[0365] Controlling the performance of the always-on display mode includes transmitting the received still image to the display driver (160) when the second processor (242) receives the still image.

[0366] The display driver can display a still image through the display panel (100c) by transmitting a driving signal corresponding to the received still image to the display panel.

[0367] The still image may include an image selected by the user.

[0368] The images selected by the user may include images of photos and emoticons.

[0369] The still image may include an image for a notification selected by the user.

[0370] Notifications may include notifications about dates and times, notifications about weather, notifications about events on home appliances, notifications about news, notifications about the user's schedule, notifications about events on the user's device, notifications about new content, notifications about news, notifications about broadcast programs, etc.

[0371] The display device can output images based on a first frame rate or a second frame rate while performing the always-on display mode.

[0372] The frequency corresponding to the first frame rate may be a higher frequency than the frequency corresponding to the second frame rate.

[0373] The frequency of the frame rate of the still image displayed during the performance of the constant display mode may be the same as the frequency of the frame rate of the image displayed during the normal display mode, or may be lower than the frequency of the frame rate of the image displayed during the normal display mode.

[0374] As illustrated in FIG. 14a, if the notification selected by the user is a notification about date and time, the display device can display the date and time when performing the always-on display mode.

[0375] The display device determines whether it is time to enter the blank mode while performing the constant display mode (304), and reduces power supplied to the first and second processors (241, 242) and the display driver (160) based on what is determined to be the time to enter the blank mode (305).

[0376] Additionally, the display device can output a still image at the same frame rate when performing blank mode as when performing constant display mode.

[0377] Additionally, the display device may output a still image at a third frame rate when performing a blank mode. Here, a frequency corresponding to the third frame rate may be lower than a frequency corresponding to the first and second frame rates.

[0378] Determining whether it is time to enter blank mode may include determining whether the image signal for the still image stored in the first processor (241) has been completely transmitted to the second processor (242) and the display driver (160).

[0379] That is, when the display device is in constant display mode, it can display a still image through the display panel and then lower the power supplied to the first and second processors (241, 242) and the display driver (160). At this time, the display device can maintain the power supplied to the display panel (100c) at the set power.

[0380] Referring to Fig. 13, the power down configuration is described.

[0381] The display device can turn down the power supplied to the first processor (241) when the transmission of the image signal for the still image from the first processor (241) to the second processor (242) is completed.

[0382] Turning down the power supplied to the first processor (241) may include turning off the power supplied to the central processing unit (241a), the graphic processing unit (241b), the display controller (241c), the encoder (241d), and the first communication interface (241e), and turning on the power supplied to the first power controller (241f).

[0383] In this way, by turning on only the power supplied to the first power controller (241f) when performing the constant display mode and turning off the power supplied to the remaining components of the first processor, the total power supplied to the first processor (241) when performing the constant display mode can be lowered compared to the total power supplied from the first processor (241) when performing the normal display mode.

[0384] The display device can turn down the power supplied to the second processor (242) when the transmission of the drive signal for the still image from the second processor (242) to the display driver (160) is completed.

[0385] Turning down the power supplied to the second processor (242) may include turning off the power supplied to the second communication interface (242a), the communication controller (242b), the memory controller (242c), the low-power memory (242d), the decoder (242e), the scaler (242f), the image processing device (242g), and the timing controller (242h), and turning on the power supplied to the second power controller (242i).

[0386] In this way, when performing the constant display mode, by turning on only the power supplied to the second power controller (242i) and turning off the power supplied to the remaining components of the second processor, the total power supplied to the second processor (242) during the constant display mode can be lowered compared to the total power supplied from the second processor (242) during the normal display mode.

[0387] The low-power memory (242d) of the second processor can perform a self-refresh function from the time of entering the always-on display mode to the time of entering the blank mode, and can transmit a drive signal for a still image to the display driver (160) while the self-refresh function is being performed.

[0388] The display device can lower the power supplied to the second processor (242) when the self-refresh function of the low-power memory (242d) of the second processor (242) is completed.

[0389] The display device can also lower the power supplied to the second processor (242) at the time of entering the always-on display mode, supply preset power to the low-power memory of the second processor (242), and lower the power of the remaining components of the second processor (242) that control the second power controller (242i).

[0390] The preset power may be the power required for the low power memory (242d) to perform the self-refresh function.

[0391] The display device can turn down the power supplied to the display driver (160) when the transmission of the driving signal for the still image from the display driver (160) to the display panel (100c) is completed.

[0392] Lowering the power supplied to the display driver (160) includes supplying the reference power required to maintain the operation of the thin film transistors of the display panel (100c).

[0393] In this way, by supplying only the reference power required to maintain the operation of the thin film transistors of the display panel (100c), the total power supplied to the display driver (160) in the constant display mode can be reduced compared to the total power supplied to the display driver (160) in the normal display mode.

[0394] The display device determines whether it is time to enter the update mode while performing the blank mode (306), and based on the determination of the time to enter the update mode, restores the power supplied to the first and second processors (241, 242) and the display driver (160) (307). At this time, the display device can maintain the power supplied to the display panel (100c) at the set power.

[0395] Determining whether it is time to enter update mode may include recognizing whether a user is present in the vicinity of the display device and determining that it is time to enter update mode based on the user being recognized.

[0396] Determining whether it is time to enter update mode may include determining whether it is a pre-stored update cycle, and determining that the current point in time corresponds to a pre-stored update cycle, and determining that it is time to enter update mode.

[0397] Determining whether to enter update mode may include determining whether to enter update mode based on the receipt of information corresponding to the notification. For example, the information corresponding to the notification may include event information from a home appliance, broadcast program information, event information from a user device, information on new OTT content, etc.

[0398] Determining whether it is time to enter update mode may include determining whether it is time to enter update mode based on changes in weather or time of day.

[0399] Referring to Fig. 13, the power recovery configuration is described.

[0400] Restoring the power supplied to the first processor (241) may include waking up the central processing unit (241a), the graphic processing unit (241b), the display controller (241c), the encoder (241d), and the first communication interface (241e) of the first processor by turning on the power supplied to the central processing unit (241a), the graphic processing unit (241b), the display controller (241c), the encoder (241d), and the first communication interface (241e).

[0401] Restoring the power supplied to the first processor (241) may include maintaining the power supplied to the first power controller (241f) in an on state.

[0402] In this way, by turning on the power supplied to the first power controller (241f) when performing the update mode and turning on the power supplied to the remaining components of the first processor, the total power supplied to the first processor (241) when performing the update mode can be restored to the same level as the total power supplied from the first processor (241) when performing the normal display mode.

[0403] Restoring the power supplied to the second processor (242) may include turning on the power supplied to the second communication interface (242a), the communication controller (242b), the memory controller (242c), the low-power memory (242d), the decoder (242e), the scaler (242f), the image processing device (242g), and the timing controller (242h) of the second processor, and waking up the second communication interface (242a), the communication controller (242b), the memory controller (242c), the low-power memory (242d), the decoder (242e), the scaler (242f), the image processing device (242g), and the timing controller (242h).

[0404] Restoring the power supplied to the second processor (242) may include maintaining the on state of the power supplied to the second power controller (242i) of the second processor.

[0405] In this way, when performing the update mode, by turning on the power supplied to the second power controller (242i) and turning on the power supplied to the remaining components of the second processor, the total power supplied to the second processor (242) during the update mode can be restored to the same level as the total power supplied from the second processor during the normal display mode.

[0406] Restoring the power supplied to the display driver (160) includes supplying power to the thin film transistors of the display panel (100c) in normal display mode.

[0407] The display device updates the still image (308).

[0408] As illustrated in FIG. 14b, if the notification selected by the user is a notification about date and time, the display device can display the updated date and time when performing the always-on display mode.

[0409] The display device can also determine whether the setting information of the pixel shift menu is the on setting of the pixel shift when performing the update mode, and control the pixel shift function based on whether the setting information of the pixel shift menu is determined to be the on setting of the pixel shift.

[0410] The display device can also perform user identification when performing update mode, check notification information set by the identified user, obtain an update image based on the checked notification information, and update an image to be displayed in the constant display mode based on the obtained update image.

[0411] The display device can determine when to enter blank mode when the update of the still image is completed, and control the performance of the blank mode.

[0412] When the display device is in constant display mode, it is possible to first turn down the power supplied to the first processor (241) and then turn down the power supplied to the second processor (242) after a preset time has elapsed.

[0413] Meanwhile, the disclosed embodiments may be implemented in the form of a recording medium storing computer-executable instructions. The instructions may be stored in the form of program code, and when executed by a processor, may generate program modules to perform the operations of the disclosed embodiments. The recording medium may be implemented as a computer-readable recording medium.

[0414] Computer-readable storage media include all types of storage media that store instructions that can be deciphered by a computer. Examples include read-only memory (ROM), random access memory (RAM), magnetic tape, magnetic disks, flash memory, and optical data storage devices.

[0415] The disclosed embodiments have been described with reference to the attached drawings as described above. Those skilled in the art will understand that the present invention can be implemented in forms other than the disclosed embodiments without altering the technical spirit or essential characteristics of the present invention. The disclosed embodiments are illustrative and should not be construed as limiting.

Claims

1. Display panel; A display driver electrically connected to the above display panel; A panel processor for transmitting a driving signal to the display driver; and A power supply unit for supplying power to the display panel, the display driver, and the panel processor is included. The panel processor is a display device that controls the power supply so that power supplied to the display panel is maintained in the always-on display mode and power supplied to at least one of the display driver and the panel processor is turned off.

2. In the first paragraph, the panel processor, A first processor that receives a video signal from an external device, A display device including a second processor that converts an image signal received from the first processor into a pixel-specific driving signal and transmits the converted pixel-specific driving signal to the display driver.

3. In paragraph 2, The first processor includes a central processing unit that processes an image signal received from the external device, a display controller that controls transmission of the received image signal, a first communication interface that transmits the received image signal to the second processor, and a first power controller that controls power supply to the central processing unit, the display controller, and the display controller. The above first power controller is a display device that receives power from a power supply unit in the always-on display mode and blocks power supplied to the central processing unit, the display controller, and the display controller.

4. In paragraph 2, The second processor includes a second communication interface for performing communication with the first processor, a low-power memory for storing an image, an image processing device for processing the received image, a timing controller for controlling operation timing of the low-power memory and the image processing device, and a second power controller for controlling power supplied to the second communication interface, the low-power memory, the image processing device, and the timing controller. The second power controller is a display device that receives power from the power supply unit in the always-on display mode and blocks power supplied to the second communication interface, low-power memory, image processing device, and timing controller.

5. In paragraph 4, The second power controller supplies reference power to the display driver in the always-on display mode, A display device in which the above-mentioned reference power is the power that makes the brightness of the display panel the reference brightness in the above-mentioned display mode.

6. In the fourth paragraph, the second processor, A display device that controls to transmit an image stored in the low-power memory to the display driver based on the power supplied to the first processor being down.

7. In the third paragraph, the first power controller, A display device that maintains the central processing unit, the display controller and the power supplied to the display controller while performing the always-on display mode based on the information set in the voice recognition mode.

8. In the first paragraph, the panel processor, Controlling the display driver so that the received image is output at the first frame rate based on the normal display mode, Controlling the display driver so that the received image is output at a second frame rate based on the above constant display mode, A display device wherein the frequency corresponding to the second frame rate is the same as or lower than the frequency corresponding to the first frame rate.

9. In the 8th paragraph, the panel processor, Controlling the power supply so that power supplied to the display driver and the panel processor is restored based on the entry point into the update mode for updating the image displayed in the above constant display mode, A display device that controls the display driver so that the received image is output at a second frame rate based on the update mode.

10. In paragraph 9, Further comprising a communication unit for performing communication with a user device and a home appliance, A display device in which the panel processor determines the entry point into the update mode based on reception of a communication signal from the user device and determines the entry point into the update mode based on reception of event information from the home appliance.

11. In the 9th paragraph, the display panel, A display device controlling pixel shift when performing the above update mode.

12. In the 8th paragraph, the panel processor, Determine the entry point into the blank mode during the execution of the above constant display mode, and control the display driver so that the pre-stored image is output at a third frame rate based on what is determined as the entry point into the blank mode. A display device wherein the frequency corresponding to the third frame rate is lower than the frequencies corresponding to the first and second frame rates.

13. Based on the entry into the always-on display mode, power supplied to at least one of the display drivers is lowered and power supplied to the display panel is maintained; Based on entry into the update mode, power supplied to at least one of the first processor, the second processor, and the display driver is restored, and power supplied to the display panel is maintained. The first processor is a processor that transmits a video signal received from an external device to the second processor, The second processor is a processor that converts the image signal into a driving signal and transmits it to the display driver. A method for controlling a display device, wherein the display driver transmits the driving signal to the display panel.

14. In paragraph 13, Outputting the video signal at the first frame rate based on the normal display mode, Based on the above constant display mode, the video signal is output at a second frame rate, Further comprising outputting the video signal at a second frame rate based on the above update mode, A method for controlling a display device, wherein the frequency corresponding to the second frame rate is the same as or lower than the frequency corresponding to the first frame rate.

15. In paragraph 14, Determines whether to enter blank mode while performing the above constant display mode, Further comprising outputting the image signal at a third frame rate based on entry into the blank mode; A method for controlling a display device, wherein the frequency corresponding to the third frame rate is lower than the frequencies corresponding to the first and second frame rates.

Images