Display device and control method thereof

Abstract

The present invention relates to a display device for preventing the occurrence of afterimages, and a control method thereof. The display device of the present invention comprises: a display panel including a plurality of pixels; a temperature sensing unit for sensing the temperature of each of the plurality of pixels; and a panel processor for adjusting the luminance of the display panel on the basis of the sensed temperature of each of the pixels and a reference temperature. The panel processor of the display device determines a luminance adjustment value for adjusting the reference temperature and the luminance on the basis of at least one of a panel protection menu, an afterimage index, and a cumulative viewing time.

Description

Display device and control method thereof

[0001] The disclosed invention relates to a display device and a control method thereof for preventing the occurrence of afterimages.

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

[0003] Among these, an OLED (organic light emitting diode)-based display device (hereinafter referred to as an organic light emitting diode display device) includes an organic light emitting diode element that emits light through an organic light emitting layer by recombination of electrons and holes.

[0004] Organic light-emitting diode (OLED) display devices have been known to exhibit afterimages in areas where logos are displayed on the display panel screen, due to deterioration of the OLED elements caused by increased current stress during prolonged operation. Furthermore, afterimages have been linked to a deterioration in the picture quality of the OLED display devices.

[0005] One aspect of the disclosed invention provides a display device and a control method thereof, which determine a reference temperature and an adjustment value of brightness based on at least one of a panel protection menu, an accumulated viewing time, an afterimage index, and an external temperature, and adjust the brightness of a display panel based on the determined reference temperature, the adjustment value of brightness, and the temperatures of a plurality of pixels of the display panel.

[0006] Another aspect of the disclosed invention provides a display device and a control method thereof for controlling the brightness of part or all of a display panel based on the temperature of a plurality of pixels of the display panel and a reference temperature.

[0007] A display device according to one aspect of the disclosed invention comprises a display panel including a plurality of pixels; a temperature sensing unit for sensing a pixel-by-pixel temperature for each of the plurality of pixels; and a panel processor for controlling the brightness of the display panel based on the sensed pixel-by-pixel temperature and a reference temperature. The panel processor of the display device according to one aspect determines a brightness adjustment value for controlling the reference temperature and the brightness based on at least one of a panel protection menu, an afterimage index, and an accumulated viewing time.

[0008] A panel protection menu of a display device according to one aspect includes a logo brightness menu for setting the brightness of a logo. A panel processor of the display device according to one aspect determines at least one of a reference temperature and a brightness adjustment value based on the brightness information of the logo set by the logo brightness menu.

[0009] A panel protection menu of a display device according to one aspect includes a pixel shift menu for setting whether to perform pixel shift. A panel processor of the display device according to one aspect determines at least one of a reference temperature and a brightness adjustment value based on whether to perform pixel shift set by the pixel shift menu.

[0010] A display device according to one aspect further includes a temperature sensor for detecting an external temperature of the display panel. A panel processor of the display device according to one aspect determines a reference temperature and a brightness adjustment value based on the detected external temperature.

[0011] A panel processor of a display device according to one aspect determines a reference temperature as a temperature lower than the determined reference temperature, and determines a brightness adjustment value as a higher adjustment value than the determined brightness adjustment value, based on an increase in accumulated viewing time.

[0012] A panel processor of a display device according to one aspect determines a reference temperature as a temperature lower than the determined reference temperature, and determines a brightness adjustment value as a higher adjustment value than the determined brightness adjustment value, based on an increase in the afterimage index.

[0013] A panel processor of a display device according to one aspect acquires the highest temperature among the detected pixel temperatures, and adjusts the brightness of a plurality of pixels of the display panel based on a brightness adjustment value determined based on whether the detected highest temperature is higher than a determined reference temperature.

[0014] A panel processor of a display device according to one aspect obtains a highest temperature among the detected pixel temperatures, obtains at least one pixel having a temperature higher than a reference temperature among a plurality of pixels based on the detected highest temperature being higher than a determined reference temperature, and adjusts the brightness of the obtained at least one pixel to a determined brightness adjustment value.

[0015] The display device according to one aspect further includes an input unit for receiving information about an afterimage correction menu and transmitting the received information about the afterimage correction menu to a panel processor.

[0016] A display device according to one aspect further includes a display driver connected to a display panel. The panel processor of the display device according to one aspect converts a video signal received from an external device into a pixel-specific control signal, transmits the converted pixel-specific control signal to the display driver, and detects a pixel-specific temperature for each of a plurality of pixels based on an operation signal of the display driver.

[0017] A panel processor of a display device according to one aspect includes a first processor that receives a video signal from an external device, a second processor that converts the video signal received from the first processor into a pixel-specific driving signal, transmits the converted pixel-specific control signal to a display driver, and detects a pixel-specific temperature and adjusts the brightness of the display panel.

[0018] A first processor of a display device according to one aspect obtains at least one of a panel protection menu, a cumulative viewing time, and an afterimage index, and transmits the obtained panel protection menu, the cumulative viewing time, and the afterimage index to a second processor.

[0019] A method for controlling a display device according to another aspect determines a reference temperature and an adjustment value of brightness based on at least one of a panel protection menu, an afterimage index, and an accumulated viewing time, detects a pixel-by-pixel temperature of a display panel, and adjusts the brightness of the display panel based on the detected pixel-by-pixel temperature, the determined reference temperature, and the determined adjustment value of brightness.

[0020] Determining the reference temperature and the brightness adjustment value based on at least one of the panel protection menu, the afterimage index, and the accumulated viewing time includes determining at least one of the reference temperature and the brightness adjustment value based on the brightness information of the logo set by the logo brightness menu among the panel protection menus, and determining at least one of the reference temperature and the brightness adjustment value based on whether or not pixel shift is set by the pixel shift menu among the panel protection menus.

[0021] A method for controlling a display device according to another aspect further includes detecting an external temperature of a display panel and determining a reference temperature and an adjustment value of brightness based on the detected external temperature.

[0022] Determining the reference temperature and the brightness adjustment value based on at least one of the panel protection menu, the afterimage index, and the accumulated viewing time includes determining the reference temperature as a temperature lower than the determined reference temperature and determining the brightness adjustment value as a higher adjustment value than the determined brightness adjustment value, based on an increase in the accumulated viewing time.

[0023] Determining the reference temperature and the brightness adjustment value based on at least one of the panel protection menu, the afterimage index, and the accumulated viewing time includes determining the reference temperature as a temperature lower than the determined reference temperature and determining the brightness adjustment value as a higher adjustment value than the determined brightness adjustment value based on an increase in the afterimage index.

[0024] Detecting the pixel temperature includes acquiring a pixel-by-pixel operation signal of a display driver, detecting a pixel-by-pixel temperature based on the acquired pixel-by-pixel operation signal, and acquiring the highest temperature among the detected pixel-by-pixel temperatures.

[0025] Controlling the brightness of the display panel includes controlling the brightness of a plurality of pixels of the display panel based on a brightness control value determined based on the highest temperature obtained being greater than or equal to a determined reference temperature.

[0026] Controlling the brightness of the display panel includes acquiring at least one pixel having a temperature higher than a reference temperature among a plurality of pixels based on the acquired highest temperature being higher than a determined reference temperature, and controlling the brightness of the acquired at least one pixel to the determined brightness adjustment value.

[0027] According to the disclosed invention, one aspect can prevent afterimages on a display panel by acquiring pixel-by-pixel temperatures for each of a plurality of pixels on the display panel and adjusting the brightness of the display panel based on the acquired pixel-by-pixel temperatures. That is, according to one aspect, afterimages can be prevented in areas of the display panel where the same image, such as a broadcaster's logo, the current time, subtitles, etc., is continuously displayed.

[0028] One aspect is that by determining the adjustment values ​​of the reference temperature and brightness based on at least one of the panel protection menu, external temperature, accumulated viewing time, and afterimage index, the afterimage occurrence time of the display panel can be delayed, thereby extending the lifespan of the display device and further providing the user with the best afterimage-free picture quality.

[0029] The present invention can improve the marketability of a display device, further increase user satisfaction, enhance user reliability, and secure product competitiveness.

[0030] Figure 1 is an exemplary diagram of a display device according to one embodiment.

[0031] FIG. 2 is an exemplary diagram of a display panel provided in a display device according to one embodiment.

[0032] FIG. 3 is an exemplary diagram of an organic light-emitting element provided in a display device according to an embodiment.

[0033] Figure 4 is a control configuration diagram of a display device according to an embodiment.

[0034] FIG. 5 is a detailed configuration diagram of a panel processor and a display driver of a display device according to an embodiment.

[0035] FIG. 6 is an exemplary diagram of a pixel driving circuit provided in a display device according to an embodiment.

[0036] Figure 7 is an example diagram of a panel protection menu of a display device according to an embodiment.

[0037] FIG. 8 is an example diagram of a reference temperature and a luminance reduction rate corresponding to a log brightness menu of a display device according to an embodiment.

[0038] FIG. 9 is an example diagram of a reference temperature and a reduction rate of luminance corresponding to a pixel shift menu of a display device according to an embodiment.

[0039] FIG. 10 is an example diagram of a reference temperature and a decrease rate of luminance corresponding to the cumulative viewing time of a display device according to an embodiment.

[0040] Figures 11 and 12 are exemplary image display diagrams of a display device according to an embodiment.

[0041] Figure 13 is a graph of luminance over time of a display device according to an embodiment.

[0042] Fig. 14 is a graph of pixel temperature over time of a display device according to an embodiment.

[0043] Fig. 15 is a control flowchart for determining the reference temperature and brightness adjustment value of a display device according to an embodiment.

[0044] Fig. 16 is a control flowchart for brightness adjustment of a display device according to an embodiment.

[0045] 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.

[0046] In connection with the description of the drawings, similar reference numerals may be used for similar or related components.

[0047] The singular form of a noun corresponding to an item may include one or more items, unless the context clearly indicates otherwise.

[0048] 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.

[0049] Terms such as "first," "second," or "first" or "second" may be used simply to distinguish one component from another and do not qualify the components in any other respect (e.g., importance or order).

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] The term “and / or” includes any combination of a plurality of related described elements or any one of a plurality of related described elements.

[0055] The operating principle and embodiments of the present invention will be described with reference to the attached drawings below.

[0056] Figure 1 is an exemplary diagram of a display device according to an embodiment.

[0057] A display device (1) is a device that displays visual and three-dimensional image information, such as a display unit of a mobile device such as a laptop, smart phone, tablet, etc., a monitor of a PC, a television, a display unit of a home appliance, a display unit in a vehicle, etc.

[0058] In this embodiment, a television among the display devices (1) is described.

[0059] As illustrated in Fig. 1, the display device (1) includes a main body (10a) forming an exterior and a stand (10b) mounted on the lower portion of the main body (10a). This display device (1) can also be installed on a wall without a stand using a bracket or the like.

[0060] The display device (1) may include a display panel (10c) provided on the main body (10a) and displaying an image.

[0061] The main body (10a) may include a cover that covers the rear surface of the display panel (10c).

[0062] The main body (10a) may further include a bezel that covers the frame of the display panel (10c). In this case, the cover and bezel of the main body may be detachably coupled to each other.

[0063] Fig. 2 is an exemplary diagram of a display panel of a display device according to an embodiment, which will be described with reference to Fig. 3. Fig. 3 is an exemplary diagram of an organic light-emitting element provided in a display device according to an embodiment.

[0064] Among display devices, the display panel of an organic light-emitting diode (OLED)-based display device is described.

[0065] As illustrated in FIG. 2, the display panel (10c) of the display device (1) 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).

[0066] 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.

[0067] The driving substrate (120) can be provided on the base substrate (110).

[0068] The driving substrate (120) can be electrically and physically connected to the organic light emitting substrate (130).

[0069] The driving substrate (120) may include a thin film transistor (TFT) circuit board that transmits a control 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.

[0070] The organic light-emitting substrate (130) can display an image by emitting light according to a control 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).

[0071] As illustrated in FIG. 3, 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).

[0072] The first electrode (131) and the second electrode (132) include at least one of a transparent conductive material and a semi-transparent metal.

[0073] The transparent conductive material includes at least one of ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), ZnO (Zinc Oxide), and In2O3 (Indium Oxide).

[0074] 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.

[0075] 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.

[0076] 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).

[0077] Among the aforementioned layers, the remaining layers except the light-emitting layer may be omitted as needed.

[0078] 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.

[0079] 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).

[0080] 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.

[0081] The encapsulating substrate (140) seals the organic light-emitting substrate (130) and the driving substrate (120).

[0082] 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.

[0083] A polarizing plate (150) may be provided on the bag substrate (140). The polarizing plate (150) serves to block external light reflection.

[0084] 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).

[0085] The polarizing plate (150) can also be provided between the encapsulation substrate (140) and the organic light-emitting substrate (130).

[0086] Fig. 4 is a control configuration diagram of a display device according to an embodiment, which is described with reference to Figs. 5 to 14.

[0087] FIG. 5 is a detailed configuration diagram of a panel processor and a display driver of a display device according to an embodiment, FIG. 6 is an exemplary diagram of a pixel driving circuit provided in a display device according to an embodiment, and FIG. 7 is an exemplary diagram of a panel protection menu of a display device according to an embodiment.

[0088] FIG. 8 is an exemplary diagram of a reference temperature and a decrease rate of luminance corresponding to a log brightness menu of a display device according to an embodiment, FIG. 9 is an exemplary diagram of a reference temperature and a decrease rate of luminance corresponding to a pixel shift menu of a display device according to an embodiment, and FIG. 10 is an exemplary diagram of a reference temperature and a decrease rate of luminance corresponding to a cumulative viewing time of a display device according to an embodiment.

[0089] Figures 11 and 12 are exemplary image display diagrams of a display device according to an embodiment.

[0090] FIG. 13 is a graph of luminance over time of a display device according to an embodiment, and FIG. 14 is a graph of pixel temperature over time of a display device according to an embodiment.

[0091] The display device (1) may include a display panel (10c), a display driver (160), an input unit (210), a communication unit (220), a temperature sensor (230), a panel processor (240), and a memory (250).

[0092] The structural description of the display panel (10c) is omitted as it is described through FIGS. 2 and 3.

[0093] The display panel (10c) may include a plurality of pixels.

[0094] 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.

[0095] The display panel (10c) 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).

[0096] As illustrated in FIG. 6, each pixel driving circuit (121) may include a first transistor (T1), a second transistor (T2), and a capacitor (C).

[0097] 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).

[0098] The source terminal of the first transistor (T1) can be connected to the gate terminal of the second transistor (T2).

[0099] A capacitor (c) may be provided between the gate terminal and the drain terminal of the second transistor (T2). An organic light-emitting element (130) may be connected to the source terminal of the second transistor (T2).

[0100] The drain terminal of the second transistor (T2) can be connected to the power line (VDD).

[0101] The data line (DL) may be a line supplied with main power.

[0102] The scan line (SL) is a gate line that supplies current to the second transistor (T2).

[0103] Electrons can be stored in a capacitor supplied with current by a second transistor (T2).

[0104] When the second transistor (T2) is turned on, current can flow to the organic light-emitting element (133).

[0105] 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.

[0106] Current flowing in the organic light-emitting element (133) means current flowing in the sub-pixel.

[0107] Each subpixel can emit light with a brightness corresponding to the amount of current flowing through the subpixel.

[0108] 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.

[0109] A display driver (160, DDI: Display Driver IC) can be connected to a display panel (10c).

[0110] The display driver (160) can receive a control signal for displaying an image from the panel processor (240) and transmit the received control signal to the display panel (10c).

[0111] The control signal for displaying the image may include a scan signal and a data signal.

[0112] The display driver (160) may include a first driver (161) and a second driver (162).

[0113] 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 (10c) 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).

[0114] The first driver (161) transmits a data signal to the driving substrate (120) of the display panel (10c) via a data line (DL), and can transmit the data signal to a plurality of pixel driving circuits of the driving substrate.

[0115] The data signal may be a signal that creates a difference in the color that the subpixels will express.

[0116] The first driver (161) may include a first display driver integrated circuit (DDI: Display Driver IC).

[0117] The first display driver integrated circuit is also called a source driver integrated circuit.

[0118] 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 (10c) via the scan line (SL).

[0119] 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).

[0120] The second driver (162) transmits a scan signal to the driving substrate (120) of the display panel (10c) via a scan line (SL), and can transmit the scan signal to a plurality of pixel driving circuits of the driving substrate.

[0121] The second driver (162) may include a second display driver integrated circuit (DDI: Display Driver IC).

[0122] The second display driver integrated circuit is also called a gate driver integrated circuit.

[0123] The input unit (210) can receive user input.

[0124] User input may include selection information of an external device, selection information of content, and setting information of a panel protection menu.

[0125] More specifically, the input unit (210) can receive selection information of an external device for communication connection with the display device (1).

[0126] External devices may include set-top boxes, user devices, and removable storage devices (e.g., USB memory, external hard drive, etc.).

[0127] The user device 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, a terminal, a portable telephone, a smart phone, a handheld device, a wearable device, etc.

[0128] The input unit (210) can receive selection information of at least one content among a plurality of contents.

[0129] 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.

[0130] The input unit (210) may include setting information of the panel protection menu.

[0131] As illustrated in FIG. 7, the panel protection menu may include a logo brightness menu and a pixel shift menu.

[0132] A logo may be a video displayed on a display panel for a predetermined amount of time in a specific location. For example, a logo may include a broadcaster logo, an age rating symbol, or a banner.

[0133] The logo brightness menu is a menu for setting whether to set the brightness of the logo and the brightness of the logo.

[0134] For example, a logo brightness menu may include a logo brightness setting of Off, which maintains the brightness of the logo, a first logo brightness setting, which sets the brightness of the logo to a first brightness, and a second logo brightness setting, which sets the brightness of the logo to a second brightness. The first brightness is a lower brightness than the second brightness.

[0135] For example, in the logo brightness menu of the display panel, the first logo brightness may be displayed as Low, and the second logo brightness may be displayed as High.

[0136] The Pixel Shift menu is a menu for setting whether to shift the pixels where the logo is displayed.

[0137] For example, a pixel shift menu might include pixel shift on and pixel shift off.

[0138] The Pixel Shift menu is a function that displays images by shifting pixels at regular intervals when Pixel Shift is set to On.

[0139] 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.

[0140] The input unit (210) may include a remote controller.

[0141] 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).

[0142] The communication unit (220) can also receive the temperature outside the display device from a temperature sensor provided outside the display device and transmit the received temperature outside the display device to the panel processor (240).

[0143] The communication unit (220) may include at least one of a short-range communication module or a long-range communication module.

[0144] 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.

[0145] 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.

[0146] According to an 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).

[0147] 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).

[0148] 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.

[0149] The display device (1) may also include a temperature sensor (230) that detects the external temperature. In this case, the temperature sensor (230) may be provided in the main body (10a). The temperature sensor (230) provided in the main body (10a) may transmit the detected temperature to the panel processor (240).

[0150] The panel processor (240) can control the overall operation of the display device.

[0151] The panel processor (240) converts an image signal received from an external device into a pixel-specific control signal and transmits the converted pixel-specific control signal to the display driver (160).

[0152] The per-pixel control signal may include a per-pixel voltage signal.

[0153] The panel processor (240) detects the pixel-by-pixel temperature of the display panel (10c) based on the pixel-by-pixel operation signals of a plurality of pixels, and adjusts the brightness of the display panel based on the detected pixel-by-pixel temperature and the reference temperature.

[0154] The panel processor (240) may include a temperature detection unit (240a) that detects the temperature of each pixel of the display panel (10c).

[0155] That is, the panel processor (240) may include a temperature detection unit that detects the temperature of each pixel of the display panel (10c) based on the pixel-by-pixel operation signals of a plurality of pixels.

[0156] The temperature detection unit (240a) may also be provided separately from the panel processor (240). In this case, the temperature detection unit (240a) can transmit information on the detected temperature of each pixel to the panel processor (240).

[0157] The pixel-by-pixel operation signals of the plurality of pixels may include pixel-by-pixel current signals of the plurality of pixels.

[0158] The pixel-by-pixel operation signals of the plurality of pixels may include pixel-by-pixel voltage signals of the plurality of pixels.

[0159] The pixel-by-pixel operation signals of a plurality of pixels may include pixel-by-pixel data signals.

[0160] The panel processor (240) can receive a pixel-specific data signal from the first driver (161) and detect a pixel-specific current signal based on the received pixel-specific data signal.

[0161] The current signal corresponding to each data signal may be stored in advance in a table.

[0162] The panel processor (240) can receive a pixel-by-pixel data signal from the first driver (161) during the blank period and detect a pixel-by-pixel current signal based on the received pixel-by-pixel data signal.

[0163] A blank interval is a period between two frames where a black screen is displayed.

[0164] When adjusting the brightness of a plurality of pixels, the panel processor (240) can obtain the highest temperature among the detected pixel temperatures and adjust the brightness of a plurality of pixels of the display panel based on whether the obtained highest temperature is higher than the reference temperature.

[0165] When adjusting the brightness of a plurality of pixels, the panel processor (240) may acquire the highest temperature among the detected pixel temperatures, and based on the fact that the acquired highest temperature is higher than the reference temperature, acquire at least one pixel among the plurality of pixels having a temperature higher than the reference temperature, and adjust the brightness of the acquired at least one pixel.

[0166] When adjusting the brightness of a plurality of pixels, the panel processor (240) can reduce the brightness of the plurality of pixels based on a predetermined brightness adjustment value.

[0167] Here, the brightness adjustment value may include a reduction rate for a preset brightness.

[0168] The brightness adjustment value can also include a subtraction value for the preset brightness.

[0169] The panel processor (240) detects the current amount per pixel based on the current signal per pixel during the decrease in the brightness of the display panel based on the decrease rate of the brightness, compares the maximum current amount among the detected current amounts per pixel with the target current amount to determine whether the maximum current amount is the target current amount, and determines that the brightness decrease is complete based on the maximum current amount being determined as the target current amount.

[0170] Here, the target current amount may be the current amount corresponding to the brightness (L=A*B%) obtained by the preset brightness (A) and the determined brightness reduction rate (B%).

[0171] The preset brightness can be the highest brightness among the brightnesses to prevent afterimages.

[0172] Information on luminance by current amount can be obtained through testing and stored in a table.

[0173] The panel processor (240) detects the temperature of each pixel based on the current signal of each pixel during the decrease in the brightness of the display panel based on the decrease rate of the brightness, compares the highest temperature among the detected pixel temperatures with the set temperature, and determines whether the highest temperature is the set temperature. It is also possible to determine that the brightness decrease is complete based on the highest temperature being determined to be the set temperature.

[0174] The pixels with the highest temperature may be pixels where residual heat generation is likely to occur.

[0175] Here, the set temperature may be a temperature corresponding to a brightness obtained by a preset brightness and a decrease rate of the determined brightness.

[0176] Information about temperature by luminance may be obtained through testing and stored in a table.

[0177] The panel processor (240) may obtain pixel-by-pixel luminance based on a current signal for each pixel during a decrease in luminance of the display panel based on a decrease rate of luminance, compare the highest luminance among the obtained pixel-by-pixel luminances with a target luminance, and determine whether the highest luminance is the target luminance, and determine that the luminance decrease is complete based on the highest luminance being determined to be the target luminance.

[0178] The target luminance can be a luminance obtained by a preset luminance and a reduction rate of the determined luminance.

[0179] Information on luminance by current can be obtained through testing and stored in a table.

[0180] The panel processor (240) can determine a reference temperature based on at least one of a panel protection menu, an afterimage index, accumulated viewing time, and an external temperature, and can determine a brightness adjustment value for adjusting brightness. Here, the brightness adjustment value can include a reduction rate for a preset brightness.

[0181] The panel protection menu may include a logo brightness menu and a pixel shift menu.

[0182] The panel processor (240) may include a first processor (241) and a second processor (242).

[0183] The panel processor (240) can perform the above-described operation using data stored in the memory (250).

[0184] 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.

[0185] 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.

[0186] The memory (250) can store the afterimage index and accumulated viewing time, and can store the deterioration index.

[0187] The memory (250) can store a preset reference residual image index.

[0188] The memory (250) stores the reference temperature and brightness adjustment values ​​corresponding to the panel protection menu, and can be stored in a table.

[0189] The brightness adjustment value may include a reduction rate relative to a preset brightness.

[0190] As illustrated in FIG. 8, the memory (250) can store a first reference temperature and a first luminance reduction rate corresponding to the logo brightness off, a second reference temperature and a second luminance reduction rate corresponding to the first logo brightness, and a third reference temperature and a third luminance reduction rate corresponding to the second logo brightness.

[0191] The first reference temperature, the second reference temperature and the third reference temperature may be the same.

[0192] The first reference temperature may be higher than the second reference temperature, and the second reference temperature may be higher than the third reference temperature.

[0193] The rate of decrease of the first luminance may be lower than the rate of decrease of the second luminance. The rate of decrease of the second luminance may be lower than the rate of decrease of the third luminance.

[0194] The memory (250) can store the reference temperature and luminance reduction rate corresponding to pixel shift on and pixel shift off, respectively, in a table.

[0195] As illustrated in FIG. 9, the memory (250) can store a fourth reference temperature and a fourth luminance reduction rate corresponding to pixel shift on, and a fifth reference temperature and a fifth luminance reduction rate corresponding to pixel shift off.

[0196] The fourth reference temperature may be higher than the fifth reference temperature.

[0197] The rate of decrease of the fourth luminance may be lower than that of the fifth luminance.

[0198] The memory (250) stores the reference temperature and luminance reduction rate corresponding to the accumulated viewing time, and may be stored in a table. Here, the luminance reduction rate may include the luminance reduction rate.

[0199] For example, as the cumulative viewing time increases, the reference temperature may decrease and the rate of decrease in brightness may increase.

[0200] As illustrated in FIG. 10, the memory (250) can store a sixth reference temperature and a sixth luminance reduction rate corresponding to a first cumulative viewing time, a seventh reference temperature and a seventh luminance reduction rate corresponding to a second cumulative viewing time, an eighth reference temperature and a eighth luminance reduction rate corresponding to a third cumulative viewing time, and a ninth reference temperature and a ninth luminance reduction rate corresponding to a fourth cumulative viewing time.

[0201] The first cumulative viewing time may be shorter than the second cumulative viewing time, the second cumulative viewing time may be shorter than the third cumulative viewing time, and the third cumulative viewing time may be shorter than the fourth cumulative viewing time.

[0202] At least two of the 6th, 7th, 8th and 9th reference temperatures may be the same, and the rest may be different.

[0203] The 6th, 7th, 8th, and 9th reference temperatures may all be different.

[0204] The sixth reference temperature may be higher than the seventh reference temperature, the seventh reference temperature may be higher than the eighth reference temperature, and the eighth reference temperature may be higher than the ninth reference temperature.

[0205] The rate of decrease of the sixth luminance may be lower than that of the seventh luminance. The rate of decrease of the seventh luminance may be lower than that of the eighth luminance. The rate of decrease of the eighth luminance may be lower than that of the ninth luminance.

[0206] The memory (250) can store the reference temperature and luminance reduction rate corresponding to the residual image index.

[0207] For example, as the afterimage index increases, the reference temperature may decrease and the rate of decrease in luminance may increase.

[0208] The memory (250) can store a 10th reference temperature and a 10th luminance reduction rate corresponding to the 1st residual image index, an 11th reference temperature and a 11th luminance reduction rate corresponding to the 2nd residual image index, a 12th reference temperature and a 12th luminance reduction rate corresponding to the 3rd residual image index, and a 13th reference temperature and a 13th luminance reduction rate corresponding to the 4th residual image index.

[0209] The first afterimage index may be lower than the second afterimage index, the second afterimage index may be lower than the third afterimage index, and the third afterimage index may be lower than the fourth afterimage index.

[0210] At least two of the 10th, 11th, 12th and 13th reference temperatures may be the same, and the rest may be different.

[0211] The 10th, 11th, 12th, and 13th reference temperatures may all be different.

[0212] The 10th reference temperature may be higher than the 11th reference temperature, the 11th reference temperature may be higher than the 12th reference temperature, and the 12th reference temperature may be higher than the 13th reference temperature.

[0213] The rate of decrease of the 10th luminance may be lower than that of the 11th luminance. The rate of decrease of the 11th luminance may be lower than that of the 12th luminance. The rate of decrease of the 12th luminance may be lower than that of the 13th luminance.

[0214] The memory (250) can store a temperature offset value of a determined reference temperature corresponding to an external temperature. The memory (250) can store a luminance offset value of a determined luminance reduction rate corresponding to an external temperature.

[0215] 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.

[0216] 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.

[0217] 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.

[0218] Hereinafter, with reference to FIG. 5, 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).

[0219] The first processor (241) may be an application processor (AP).

[0220] The first processor (241) can receive a video signal from an external device and transmit the received video signal to the second processor (242).

[0221] The first processor (241) can process the received image signal and transmit the user input received through the input unit (210) to the second processor (242), and can also transmit information on the external temperature received through the temperature sensor (230) to the second processor (242).

[0222] User input may include configuration information for the panel protection menu.

[0223] The panel protection menu may include a logo brightness menu and a pixel shift menu.

[0224] For example, a logo brightness menu may include log brightness off, first log brightness, and second log brightness. The stages of the logo brightness menu are not limited to three stages.

[0225] The Pixel Shift menu may include Pixel Shift On and Pixel Shift Off.

[0226] The external temperature may include the temperature surrounding the display device.

[0227] The first processor (241) can encode image data corresponding to an image signal received from an external device and transmit an image signal corresponding to the encoded image data to the second processor (242).

[0228] The first processor (241) can count the accumulated viewing time and store information about the counted accumulated viewing time.

[0229] The first processor (241) can accumulate and store the luminance and current per pixel for each pixel, obtain an afterimage index based on the accumulated and stored luminance and current per pixel for each pixel, and store information about the acquired afterimage index.

[0230] The first processor (241) accumulates and stores the luminance and temperature per pixel, and can also obtain an afterimage index based on the accumulated and stored luminance and temperature per pixel.

[0231] The first processor (241) can also obtain a residual image index for each pixel.

[0232] The first processor (241) can obtain a degradation index based on the accumulated stored pixel-by-pixel luminance, the accumulated stored pixel-by-pixel current, and the accumulated viewing time. In other words, the first processor (241) can also obtain a degradation index of the display panel based on the pixel-by-pixel afterimage index.

[0233] The first processor (241) can also obtain a degradation index of the display panel based on any one of the average value of the afterimage index per pixel, the maximum value of the afterimage index per pixel, the median value of the afterimage index per pixel, and the minimum value of the afterimage index per pixel.

[0234] The first processor (241) can transmit the setting information of the panel protection menu, the external temperature, the afterimage index, and the accumulated viewing time to the second processor (242) to determine the reference temperature and the decrease rate of the brightness.

[0235] The first processor (241) can also transmit a degradation index to the second processor (242) to determine the rate of decrease in reference temperature and brightness.

[0236] The first processor (241) determines a reference temperature based on at least one of the setting information of the panel protection menu, the afterimage index, and the accumulated viewing time, and can also determine the rate of decrease in brightness.

[0237] The first processor (241) determines a reference temperature based on the external temperature and can also determine a rate of decrease in brightness.

[0238] The first processor can also adjust the reference temperature determined based on the external temperature. The first processor can lower the reference temperature as the external temperature increases, and raise the reference temperature as the external temperature decreases.

[0239] The first processor (241) determines the reference temperature based on the deterioration index and can also determine the rate of decrease in brightness.

[0240]

[0241] The second processor (242) can receive user input from the first processor (241).

[0242] User input may include configuration information for the panel protection menu.

[0243] The panel protection menu may include a logo brightness menu and a pixel shift menu.

[0244] The second processor (242) can receive accumulated viewing time and afterimage index from the first processor (241), and can receive information about external temperature from the first processor (241).

[0245] The second processor (242) can also receive a degradation index from the first processor (241).

[0246] The second processor (242) can receive an image signal from the first processor (241), convert the received image signal into a control signal, and transmit the converted control signal to the display driver (160).

[0247] 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).

[0248] The second processor (242) can detect current per pixel based on the operation signal received from the first driver (161) and detect temperature per pixel based on the detected current per pixel.

[0249] The second processor (242) may include a current detection unit for detecting current per pixel of the display panel (10c) based on pixel-by-pixel operation signals of a plurality of pixels, and a temperature detection unit (240a) for detecting temperature per pixel based on the detected current per pixel.

[0250] The second processor (242) may include a temperature detection unit (240a) that detects the temperature of each pixel of the display panel (10c) based on the pixel-by-pixel operation signals of a plurality of pixels.

[0251] The temperature detection unit (240a) may also be provided separately from the second processor (242). In this case, the temperature detection unit (240a) detects the current per pixel of the display panel (10c) based on the pixel-by-pixel operation signals of a plurality of pixels, detects the temperature per pixel corresponding to the detected current per pixel, and transmits information about the detected temperature per pixel to the second processor (242).

[0252] The temperatures corresponding to the currents can be pre-stored in a table.

[0253] The motion signal may include a data signal. The motion signal may include a current signal. The motion signal may also include a voltage signal.

[0254] The second processor (242) can receive a pixel-specific data signal from the first driver (161) during the blank period, detect a pixel-specific current signal based on the received pixel-specific data signal, and detect a pixel-specific temperature based on the detected pixel-specific current.

[0255] A current signal may include a current amount.

[0256] A blank interval is a period between two frames where a black screen is displayed.

[0257] The second processor (242) can determine a reference temperature and a brightness reduction rate based on at least one of the setting information of the panel protection menu, the afterimage index, and the accumulated viewing time.

[0258] The second processor (242) determines the reference temperature based on the external temperature and can also determine the rate of decrease in brightness.

[0259] The second processor (242) can also adjust the reference temperature determined based on the external temperature. The second processor (242) can lower the determined reference temperature as the external temperature increases, and can raise the reference temperature as the external temperature decreases.

[0260] The second processor (242) determines the reference temperature based on the deterioration index and can also determine the rate of decrease in brightness.

[0261] The second processor (242) can adjust the brightness of some or all pixels based on the detected pixel-by-pixel temperature, the determined reference temperature, and the determined brightness reduction rate.

[0262] The second processor (242) can obtain the highest temperature among the detected pixel temperatures and adjust the brightness of a plurality of pixels of the display panel based on whether the obtained highest temperature is higher than the reference temperature.

[0263] The second processor (242) may acquire the highest temperature among the detected pixel temperatures, and based on the fact that the acquired highest temperature is higher than the reference temperature, acquire at least one pixel among a plurality of pixels having a temperature higher than the reference temperature, and adjust the brightness of the acquired at least one pixel.

[0264] As illustrated in FIG. 11, the second processor (242) can adjust the brightness of the pixels (11) corresponding to the K Broadcasting logo based on the fact that the temperature of the pixels (11) corresponding to the K Broadcasting logo among the temperatures of the pixels is the highest temperature. The second processor (242) can obtain a reference temperature and a reduction rate of brightness based on the logo brightness menu, and reduce the brightness of the pixels (11) corresponding to the K Broadcasting logo by the determined reduction rate of brightness based on the fact that the highest temperature is equal to or greater than the obtained reference temperature. In this case, the second processor (242) can maintain the brightness of the remaining pixels (12, 13).

[0265] The second processor (242) can reduce the brightness of the pixels (11) corresponding to the K Broadcasting logo and the pixels (12) corresponding to the NEWS banner at a brightness reduction rate determined based on the fact that the temperatures of the pixels (11) corresponding to the K Broadcasting logo and the pixels (12) corresponding to the NEWS banner are the highest temperatures among the temperatures of the pixels, and that the highest temperatures are higher than the determined reference temperature. In this case, the second processor (242) can maintain the brightness of the remaining pixels (13).

[0266] The second processor (242) can reduce the brightness of a plurality of pixels (11, 12, 13) of the display panel at a brightness reduction rate determined based on the temperature of the pixels corresponding to the K Broadcasting logo (11) or the NEWS banner (12) among the temperatures of the pixels being the highest temperature and the highest temperature being higher than the determined reference temperature.

[0267] The configuration of the second processor (242) that determines the reduction rate of the reference temperature and brightness will be described in more detail.

[0268] The second processor (242) can determine the reduction rate of the reference temperature and brightness based on the setting information of the logo brightness menu.

[0269] For example, the second processor (242) can determine the reference temperature as the first reference temperature and the decrease rate of the brightness as the decrease rate of the first brightness based on the fact that the setting information of the panel protection menu is information about turning off the logo brightness.

[0270] The second processor (242) can determine the reference temperature as the second reference temperature and the decrease rate of the brightness as the decrease rate of the second brightness based on the fact that the setting information of the panel protection menu is information about the brightness of the first logo.

[0271] The second processor (242) can determine the reference temperature as the third reference temperature and the decrease rate of the brightness as the decrease rate of the third brightness based on the fact that the setting information of the panel protection menu is information about the brightness of the second logo.

[0272] The first reference temperature, the second reference temperature and the third reference temperature may be the same.

[0273] At least two of the first reference temperature, the second reference temperature, and the third reference temperature may be the same, and the remaining one may be different.

[0274] The first reference temperature, the second reference temperature, and the third reference temperature may all be different. In this case, the first reference temperature may be higher than the second reference temperature, and the second reference temperature may be higher than the third reference temperature.

[0275] The rate of decrease of the first luminance may be lower than that of the second luminance. The rate of decrease of the second luminance may be lower than that of the third luminance.

[0276] The second processor (242) can determine the reduction rate of the reference temperature and brightness based on the setting information of the pixel shift menu.

[0277] For example, the second processor (242) can determine the reference temperature as the fourth reference temperature and the decrease rate of the luminance as the decrease rate of the fourth luminance based on the fact that the setting information of the panel protection menu is information about pixel shift on.

[0278] The second processor (242) can determine the reference temperature as the fifth reference temperature and the decrease rate of the luminance as the decrease rate of the fifth luminance based on the fact that the setting information of the panel protection menu is information about pixel shift off.

[0279] The fourth reference temperature may be higher than the fifth reference temperature. The rate of decrease in the fourth luminance may be lower than the rate of decrease in the fifth luminance.

[0280] The second processor (242) can determine the reduction rate of the reference temperature and brightness based on the received accumulated viewing time.

[0281] For example, the second processor (242) may obtain a sixth reference temperature and a sixth luminance reduction rate corresponding to the first cumulative viewing time based on the fact that the received cumulative viewing time is the first cumulative viewing time, determine the reference temperature as the obtained sixth reference temperature, and determine the luminance reduction rate as the obtained sixth luminance reduction rate.

[0282] The second processor (242) may obtain a seventh reference temperature and a seventh luminance reduction rate corresponding to the second cumulative viewing time based on the second cumulative viewing time being the second cumulative viewing time, determine the reference temperature as the obtained seventh reference temperature, and determine the luminance reduction rate as the obtained seventh luminance reduction rate.

[0283] The second processor (242) may obtain an eighth reference temperature and an eighth luminance reduction rate corresponding to the third cumulative viewing time based on the fact that the cumulative viewing time is the third cumulative viewing time, determine the reference temperature as the obtained eighth reference temperature, and determine the luminance reduction rate as the obtained eighth luminance reduction rate.

[0284] The second processor (242) may obtain a ninth reference temperature and a ninth luminance reduction rate corresponding to the fourth cumulative viewing time based on the fact that the cumulative viewing time is the fourth cumulative viewing time, determine the reference temperature as the obtained ninth reference temperature, and determine the luminance reduction rate as the obtained ninth luminance reduction rate.

[0285] The first cumulative viewing time may be shorter than the second cumulative viewing time, the second cumulative viewing time may be shorter than the third cumulative viewing time, and the third cumulative viewing time may be shorter than the fourth cumulative viewing time.

[0286] At least two of the 6th, 7th, 8th and 9th reference temperatures may be the same, and the rest may be different.

[0287] The 6th, 7th, 8th, and 9th reference temperatures may all be different. In this case, the 6th reference temperature may be higher than the 7th reference temperature, the 7th reference temperature may be higher than the 8th reference temperature, and the 8th reference temperature may be higher than the 9th reference temperature.

[0288] The rate of decrease of the sixth luminance may be lower than that of the seventh luminance. The rate of decrease of the seventh luminance may be lower than that of the eighth luminance. The rate of decrease of the eighth luminance may be lower than that of the ninth luminance.

[0289] The second processor (242) can also determine the reduction rate of the reference temperature and brightness based on the received residual image index.

[0290] For example, the second processor (242) may obtain a tenth reference temperature and a tenth reduction rate of luminance corresponding to the first residual image index based on the fact that the received residual image index is the first residual image index, determine the reference temperature as the tenth reference temperature, and determine the reduction rate of luminance as the reduction rate of the tenth luminance.

[0291] The second processor (242) can obtain an eleventh reference temperature and an eleventh luminance reduction rate corresponding to the second residual image index based on the fact that the received residual image index is the second residual image index, determine the reference temperature as the eleventh reference temperature, and determine the luminance reduction rate as the eleventh luminance reduction rate.

[0292] The second processor (242) can obtain a 12th reference temperature and a 12th luminance reduction rate corresponding to the 3rd residual image index based on the fact that the received residual image index is the 3rd residual image index, determine the reference temperature as the 12th reference temperature, and determine the luminance reduction rate as the 12th luminance reduction rate.

[0293] The second processor (242) can obtain a 13th reference temperature and a 13th luminance reduction rate corresponding to the 4th residual image index based on the fact that the received residual image index is the 4th residual image index, determine the reference temperature as the 13th reference temperature, and determine the luminance reduction rate as the 13th luminance reduction rate.

[0294] The second processor (242) can also determine the reduction rate of the reference temperature and brightness based on the received degradation index.

[0295] The second processor (242) can obtain a temperature offset value corresponding to the received external temperature based on the received external temperature and adjust the reference temperature determined based on the obtained temperature offset value.

[0296] The second processor (242) can also obtain a brightness offset value corresponding to the received external temperature based on the received external temperature and adjust the brightness reduction rate determined based on the obtained brightness offset value.

[0297] When a pixel-by-pixel afterimage index is received, the second processor (242) determines the necessity of brightness control for pixel-by-pixel afterimage prevention based on the received pixel-by-pixel afterimage index, and may omit brightness control of at least one pixel based on determining that brightness control is unnecessary for at least one pixel.

[0298] The second processor (242) can omit brightness adjustment of at least one pixel based on the residual image index of at least one pixel being greater than or equal to a preset reference residual image index.

[0299] As illustrated in FIG. 12, the second processor (242) can omit brightness adjustment of pixels (14) corresponding to the S logo based on the fact that the afterimage index of the pixels (14) corresponding to the S logo is greater than or equal to a preset reference afterimage index.

[0300] The higher the afterimage index, the more likely it is that afterimages will occur.

[0301] The second processor (242) determines a reference temperature and a reduction rate of brightness based on the residual image index of the remaining pixels (15) based on the residual image index of the remaining pixels (15) being less than a preset reference residual image index, obtains the highest temperature among the temperatures of the remaining pixels, and controls a reduction in brightness of the display panel based on the obtained highest temperature, the determined reference temperature, and the determined reduction rate of brightness.

[0302] The second processor (242) can also omit brightness adjustment for at least one pixel based on the degradation index.

[0303] The second processor (242) can predict the pixel-by-pixel brightness adjustment time for preventing afterimages based on the pixel-by-pixel afterimage index. The second processor (242) can control the pixel-by-pixel brightness adjustment for preventing afterimages based on the pixel-by-pixel brightness adjustment time.

[0304] Additionally, the second processor (242) can predict the brightness adjustment time for preventing afterimages on the display panel based on the deterioration index. The second processor (242) can control the brightness adjustment of the display panel for preventing afterimages based on the brightness adjustment time of the display panel.

[0305] The second processor (242) may obtain a reference temperature corresponding to the panel protection menu, a reference temperature corresponding to the afterimage index, and a reference temperature corresponding to the accumulated viewing time, determine the lowest reference temperature among the obtained reference temperatures as the reference temperature for preventing afterimages, and determine the reduction rate of brightness corresponding to the obtained reference temperature as the reduction rate of brightness for preventing afterimages.

[0306] For example, the second processor (242) may obtain a first reference temperature corresponding to information about logo brightness off and pixel shift off based on the fact that the setting information of the panel protection menu is information about logo brightness off and pixel shift off, obtain a fifth reference temperature corresponding to information about pixel shift off, compare the first reference temperature and the fifth reference temperature, determine the reference temperature as the fifth reference temperature based on the fact that the first reference temperature is lower than the fifth reference temperature, and determine the decrease rate of the brightness as the decrease rate of the fifth brightness.

[0307] As another example, the second processor (242) may obtain a third reference temperature corresponding to the information on the second logo brightness based on the fact that the setting information of the panel protection menu is information on the second logo brightness and the received accumulated viewing time is the fourth accumulated viewing time, obtain a ninth reference temperature corresponding to the information on the fourth accumulated viewing time, compare the third reference temperature with the ninth reference temperature, and determine the reference temperature for preventing afterimages as the ninth reference temperature based on the fact that the third reference temperature is lower than the ninth reference temperature, and determine the reduction rate of the brightness for preventing afterimages as the reduction rate of the ninth brightness.

[0308] The second processor (242) can compare the reduction rates of brightness corresponding to the two or more reference temperatures based on the fact that the two or more obtained reference temperatures are all the same, obtain the largest reduction rate among the reduction rates of brightness, and determine the obtained reduction rate of brightness as the reduction rate of brightness for preventing afterimages.

[0309] The specific configuration of the first processor (241) and the second processor (242) will be explained with an example.

[0310] The first processor (241) may include a central processing unit (CPU) that controls the overall operation of the first processor (241), a graphic processing unit (GPU) for image processing, a display controller that generates image data and controls a display driver (160), an encoder that compresses image data, and a communication interface that receives an image signal from an external device and transmits an image signal and a control command corresponding to the compressed data in the encoder.

[0311] The central processing unit can also perform image processing functions. In this case, the graphics processing unit can be omitted.

[0312] The control command may include user input received via the input unit (210).

[0313] The central processing unit can perform computational processing of data to be output to the display device (1) in response to user input. The central processing unit can transmit the computed data to the display controller.

[0314] The display controller can generate image data to be transmitted to the second processor (242) based on data received from an external device.

[0315] The display controller can control the output speed of video data.

[0316] It is also possible to transmit a video signal corresponding to the video data to the second processor (242) without a compression process for the video data.

[0317] The communication interface can transmit a video signal corresponding to the video data encoded by the encoder to the second processor (242).

[0318] The graphics processing unit, central processing unit, display controller, compression encoder, and communication interface of the first processor (241) can be implemented as a system on chip (SOC).

[0319] The second processor (242) may include a communication interface, graphics memory, a decoder, an image processing unit, a timing controller, and a power management unit.

[0320] The communication interface can receive a video signal from the first processor (241) and receive information on the external temperature and setting information of the panel protection menu.

[0321] The communication interface can receive the accumulated viewing time, afterimage index, and deterioration index from the first processor (241).

[0322] The graphics memory temporarily stores image data corresponding to the received image signal and transmits the stored image data to the display driver.

[0323] The decoder can perform decoding of image data stored in graphics memory.

[0324] The decoder can decode image data corresponding to an image signal received via a communication interface. If an uncompressed image signal is received from the first processor (241), decoding in the second processor may be omitted.

[0325] The image processing unit can signal process an image signal corresponding to decoded image data or a received image signal, and transmit the signal-processed image data to a timing controller.

[0326] The timing controller converts image data received from the image processing unit into a control signal required by the display driver (160).

[0327] The timing controller can control the overall operation performed in the second processor (242). The timing controller can detect the temperature of each pixel of the display panel, determine the decrease rate of the reference temperature and brightness, and adjust the brightness of the display panel based on the detected temperature of each pixel, the reference temperature, and the decrease rate of the brightness.

[0328] The timing controller can supply a synchronizing signal or a clock signal to the first and second drivers (161, 162).

[0329] The power management unit generates a voltage for driving the display panel (10c) and supplies the generated voltage to the first driver (161) and the second driver (162).

[0330] The power management unit can also supply the power required for the operation of each component of the second processor (242).

[0331]

[0332] As shown in Fig. 13, it can be seen that the brightness of the pixel is reduced by adjusting the brightness of the display panel based on the detected pixel-by-pixel temperature, reference temperature, and decrease rate of brightness.

[0333] As shown in Fig. 14, it can be seen that by reducing the brightness of the display panel, the temperature of the pixels is also lowered.

[0334] In this way, the brightness of the display panel can be adjusted based on the detected pixel-by-pixel temperature, reference temperature, and decrease rate of brightness, and by lowering the pixel temperature through brightness adjustment, the occurrence of afterimages can be prevented.

[0335] At least one component may be added or deleted to correspond to the performance of the components of the display device illustrated in FIGS. 4 and 5. 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.

[0336] Meanwhile, each component illustrated in FIGS. 4 and 5 refers to software and / or hardware components such as Field Programmable Gate Array (FPGA) and Application Specific Integrated Circuit (ASIC).

[0337] Fig. 15 is a control flowchart for determining the reference temperature and brightness adjustment value of a display device according to an embodiment.

[0338] The display device acquires the panel protection menu, accumulated viewing time, afterimage index, and external temperature (301). This will be explained in more detail.

[0339] The panel protection menu may include a logo brightness menu for setting whether to set logo brightness and a pixel shift menu for setting whether to pixel shift.

[0340] Information about logo brightness off may be the default information.

[0341] Information about pixel shift on may be default information.

[0342] The display device can determine whether to change the setting information of the panel protection menu based on the user input received through the input unit (210) and can obtain the setting information of the panel protection menu based on whether the setting information of the panel protection menu has been changed.

[0343] The display device can check whether the setting information of the panel protection menu is information about logo brightness off, information about the first logo brightness, or information about the second logo brightness, and can obtain the checked information as the setting information of the panel protection menu.

[0344] The display device can check whether the setting information of the panel protection menu is information about pixel shift off or information about pixel shift on, and obtain the checked information as the setting information of the panel protection menu.

[0345] The display device can acquire a viewing time from the time when the display device's on command is received to the time when the display device's off command is received, and store the acquired viewing time. In other words, the display device can acquire an accumulated viewing time by adding up the stored viewing times.

[0346] The display device can store pixel-by-pixel luminance and pixel-by-pixel temperature while the display device is on, and obtain an afterimage index based on the currently stored pixel-by-pixel luminance and pixel-by-pixel temperature and the previously stored pixel-by-pixel luminance and pixel-by-pixel temperature.

[0347] The display device can obtain temperature information received from a temperature sensor (230) as an external temperature.

[0348] The display device can determine the reference temperature and brightness adjustment values ​​based on at least one of the acquired panel protection menu, accumulated viewing time, afterimage index, and external temperature (302). This will be described with an example.

[0349] The display device can determine the reference temperature as the first reference temperature and the brightness reduction rate as the first brightness reduction rate based on the setting information of the panel protection menu being information about turning off the logo brightness.

[0350] The display device can determine the reference temperature as the second reference temperature and the decrease rate of the brightness as the decrease rate of the second brightness based on the setting information of the panel protection menu being information about the first logo brightness.

[0351] The display device can determine the reference temperature as the third reference temperature and the decrease rate of the luminance as the decrease rate of the third luminance based on the setting information of the panel protection menu being information on the second logo brightness.

[0352] The display device can determine the reference temperature as the fourth reference temperature and the luminance reduction rate as the fourth luminance reduction rate based on the setting information of the panel protection menu being information about pixel shift on.

[0353] The display device can determine the reference temperature as the fifth reference temperature and the luminance reduction rate as the fifth luminance reduction rate based on the setting information of the panel protection menu being information about pixel shift off.

[0354] The display device may obtain a sixth reference temperature and a sixth luminance reduction rate corresponding to the first cumulative viewing time based on the received cumulative viewing time being the first cumulative viewing time, determine the reference temperature as the obtained sixth reference temperature, and determine the luminance reduction rate as the obtained sixth luminance reduction rate.

[0355] The display device can obtain a seventh reference temperature and a seventh luminance reduction rate corresponding to the second cumulative viewing time based on the second cumulative viewing time being the second cumulative viewing time, determine the reference temperature as the obtained seventh reference temperature, and determine the luminance reduction rate as the obtained seventh luminance reduction rate.

[0356] The display device may obtain an eighth reference temperature and an eighth luminance reduction rate corresponding to the third cumulative viewing time based on the third cumulative viewing time being the third cumulative viewing time, determine the reference temperature as the obtained eighth reference temperature, and determine the luminance reduction rate as the obtained eighth luminance reduction rate.

[0357] The display device may obtain a ninth reference temperature and a ninth luminance reduction rate corresponding to the fourth cumulative viewing time based on the fourth cumulative viewing time being the fourth cumulative viewing time, determine the reference temperature as the obtained ninth reference temperature, and determine the luminance reduction rate as the obtained ninth luminance reduction rate.

[0358] The display device can obtain a tenth reference temperature and a tenth reduction rate of luminance corresponding to the first residual image index based on the received residual image index being the first residual image index, determine the reference temperature as the tenth reference temperature, and determine the reduction rate of luminance as the reduction rate of the tenth luminance.

[0359] The display device can obtain an eleventh reference temperature and an eleventh luminance reduction rate corresponding to the second afterimage index based on the received afterimage index being a second afterimage index, determine the reference temperature as the eleventh reference temperature, and determine the luminance reduction rate as the eleventh luminance reduction rate.

[0360] The display device can obtain a 12th reference temperature and a 12th luminance reduction rate corresponding to the 3rd afterimage index based on the received afterimage index being the 3rd afterimage index, determine the reference temperature as the 12th reference temperature, and determine the luminance reduction rate as the 12th luminance reduction rate.

[0361] The display device can obtain a 13th reference temperature and a 13th luminance reduction rate corresponding to the 4th afterimage index based on the received afterimage index being the 4th afterimage index, determine the reference temperature as the 13th reference temperature, and determine the luminance reduction rate as the 13th luminance reduction rate.

[0362] The display device can obtain a temperature offset value corresponding to the received external temperature based on the received external temperature and adjust a reference temperature determined based on the obtained temperature offset value.

[0363] The display device can adjust the brightness of the display panel based on the pixel temperature of the display panel, the determined reference temperature, and the determined brightness adjustment value (303).

[0364] The display device can compare the temperature of each pixel of the display panel with a determined reference temperature, and adjust the brightness of the display panel based on the determined brightness adjustment value based on the comparison result (303).

[0365] Fig. 16 is a control flowchart for brightness adjustment of a display device according to an embodiment.

[0366] The display device can receive a video signal from an external device (311).

[0367] The display device can generate pixel-by-pixel control signals for a plurality of pixels based on the received image signal and transmit the generated pixel-by-pixel control signals for the plurality of pixels to the display driver (160) (312).

[0368] Generating a pixel-specific control signal for a plurality of pixels may include generating a pixel-specific data signal for a plurality of pixels and a pixel-specific scan signal for a plurality of pixels.

[0369] Transmitting a pixel-by-pixel control signal of a plurality of pixels to a display driver (130) may include transmitting a pixel-by-pixel data signal of a plurality of pixels to a first driver (161) and transmitting a pixel-by-pixel scan signal of a plurality of pixels to a second driver (162).

[0370] The display device can receive pixel-by-pixel operation signals of a plurality of pixels from the first driver (161) (313) and detect pixel-by-pixel current signals based on the received pixel-by-pixel operation signals (314). The pixel-by-pixel operation signals of the plurality of pixels can include pixel-by-pixel data signals of the plurality of pixels.

[0371] The display device can receive a pixel-by-pixel data signal from the first driver (161) during the blank period and detect a pixel-by-pixel current signal based on the received pixel-by-pixel data signal.

[0372] The current signal corresponding to each data signal may be stored in advance in a table.

[0373] A blank interval is a period between two frames where a black screen is displayed.

[0374] The display device can detect the pixel-by-pixel temperature of the display panel (10c) based on the pixel-by-pixel current signals of a plurality of pixels (315).

[0375] Information about the temperature corresponding to each current signal may be stored in advance in a table as information obtained through testing.

[0376] The display device adjusts the brightness of the display panel based on the detected pixel temperature and the determined reference temperature.

[0377] More specifically, the display device acquires the highest temperature among the detected pixel temperatures (316), and compares the acquired highest temperature with a reference temperature to determine whether the acquired highest temperature is higher than the reference temperature (317).

[0378] The display device can adjust the brightness of a plurality of pixels of the display panel based on whether the obtained highest temperature is greater than or equal to a determined reference temperature (318).

[0379] Controlling the brightness of a plurality of pixels of a display panel may include controlling the brightness of the plurality of pixels based on a determined brightness control value. Here, the brightness control value may include a brightness reduction rate relative to a preset brightness.

[0380] It is also possible to adjust the brightness of multiple pixels of a display panel by adjusting the brightness of all of the multiple pixels based on whether the highest temperature obtained is higher than a reference temperature.

[0381] Controlling the brightness of a plurality of pixels of a display panel is also possible by acquiring at least one pixel among the plurality of pixels having a temperature higher than a reference temperature based on the highest temperature acquired being higher than a reference temperature, and controlling the brightness of the acquired at least one pixel.

[0382] Controlling the luminance of a plurality of pixels of the display panel may include reducing the luminance of the plurality of pixels based on a determined luminance reduction rate.

[0383] The display device may detect the current amount per pixel based on the current signal per pixel during the decrease in the brightness of the display panel based on the decrease rate of the brightness, compare the maximum current amount among the detected current amounts per pixel with the target current amount to determine whether the maximum current amount is the target current amount, and determine that the brightness decrease is complete based on the maximum current amount being determined to be the target current amount.

[0384] Here, the target current amount may be the current amount corresponding to the brightness (L=A*B%) obtained by the preset brightness (A) and the determined brightness reduction rate (B%).

[0385] The preset brightness can be the highest brightness among the brightnesses to prevent afterimages.

[0386] Information on luminance by current amount can be obtained through testing and stored in a table.

[0387] The display device may detect the temperature of each pixel based on the current signal for each pixel during the decrease in the brightness of the display panel based on the decrease rate of the brightness, compare the highest temperature among the detected pixel temperatures with a set temperature to determine whether the highest temperature is the set temperature, and determine that the brightness decrease is complete based on the highest temperature being determined to be the set temperature.

[0388] Here, the set temperature may be a temperature corresponding to a brightness obtained by a preset brightness and a decrease rate of the determined brightness.

[0389] Information about temperature by luminance may be obtained through testing and stored in a table.

[0390] The display device may obtain the luminance of each pixel based on the current signal for each pixel during the luminance reduction of the display panel based on the rate of decrease in luminance, compare the highest luminance among the obtained pixel luminances with the target luminance, and determine whether the highest luminance is the target luminance, and determine that the luminance reduction is complete based on the highest luminance being determined to be the target luminance.

[0391] The target luminance can be a luminance obtained by a preset luminance and a reduction rate of the determined luminance.

[0392] Information on luminance by current can be obtained through testing and stored in a table.

[0393] 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.

[0394] 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.

[0395] 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 features of the present invention. The disclosed embodiments are illustrative and should not be construed as limiting.

Claims

1. A display panel comprising a plurality of pixels; A temperature detection unit that detects the pixel temperature for each of the plurality of pixels; and A panel processor is included that adjusts the brightness of the display panel based on the detected pixel temperature and the reference temperature. A display device wherein the panel processor determines a brightness adjustment value for controlling the reference temperature and the brightness based on at least one of a panel protection menu, an afterimage index, and accumulated viewing time.

2. In paragraph 1, The above panel protection menu includes a logo brightness menu for setting the brightness of the logo and a pixel shift menu for setting whether to pixel shift. The above panel processor determines at least one of the reference temperature and the brightness adjustment value based on the brightness information of the logo set by the logo brightness menu, The panel processor is a display device that determines at least one of the reference temperature and the brightness adjustment value based on whether the pixel shift is set by the pixel shift menu.

3. In paragraph 1, Further comprising a temperature sensor for detecting the temperature outside the display panel; The above panel processor is a display device that determines the reference temperature and the brightness adjustment value based on the detected external temperature.

4. In the first paragraph, the panel processor, A display device that determines the reference temperature to be a temperature lower than the determined reference temperature and determines the brightness adjustment value to be a higher adjustment value than the determined brightness adjustment value based on an increase in the accumulated viewing time.

5. In the first paragraph, the panel processor, A display device that determines the reference temperature to be a temperature lower than the determined reference temperature and determines the brightness adjustment value to be a higher adjustment value than the determined brightness adjustment value based on an increase in the afterimage index.

6. In the first paragraph, the panel processor, A display device that acquires the highest temperature among the detected pixel temperatures, and adjusts the brightness of a plurality of pixels of the display panel based on the determined brightness adjustment value based on the detected highest temperature being higher than the determined reference temperature.

7. In the first paragraph, the panel processor, A display device that acquires the highest temperature among the detected pixel temperatures, acquires at least one pixel having a temperature higher than the reference temperature among the plurality of pixels based on the detected highest temperature being higher than the determined reference temperature, and adjusts the brightness of the acquired at least one pixel to the determined brightness adjustment value.

8. In paragraph 1, A display device further comprising an input unit for receiving information about the afterimage correction menu and transmitting the received information about the afterimage correction menu to the panel processor.

9. In paragraph 1, Further comprising a display driver connected to the above display panel, The above panel processor converts an image signal received from an external device into a pixel-by-pixel control signal and transmits the converted pixel-by-pixel control signal to the display driver. The panel processor is a display device that detects the pixel-by-pixel temperature for each of the plurality of pixels based on an operation signal of the display driver.

10. In paragraph 9, The panel processor includes a first processor that receives an image signal from the external device, a second processor that converts the image signal received from the first processor into the pixel-specific driving signal and transmits the converted pixel-specific control signal to the display driver, and detects the pixel-specific temperature and adjusts the brightness of the display panel. A display device in which the first processor obtains at least one of the panel protection menu, the accumulated viewing time, and the afterimage index, and transmits at least one of the obtained panel protection menu, the accumulated viewing time, and the afterimage index to the second processor.

11. Determine the adjustment values ​​of the reference temperature and brightness based on at least one of the panel protection menu, afterimage index, and accumulated viewing time, Detects the temperature of each pixel of the above display panel, A control method for a display device that controls the brightness of the display panel based on the detected pixel-by-pixel temperature, the determined reference temperature, and the determined brightness control value.

12. In the 11th paragraph, determining the adjustment values ​​of the reference temperature and brightness based on at least one of the panel protection menu, the afterimage index and the accumulated viewing time, At least one of the reference temperature and the brightness adjustment value is determined based on the brightness information of the logo set by the logo brightness menu among the panel protection menus, A method for controlling a display device, comprising determining at least one of the reference temperature and the brightness adjustment values ​​based on whether pixel shift is set by the pixel shift menu among the panel protection menus.

13. In paragraph 11, Detects the temperature outside the above display panel, A control method of a display device further comprising determining the reference temperature and the brightness adjustment value based on the detected external temperature.

14. In the 11th paragraph, determining the adjustment values ​​of the reference temperature and brightness based on at least one of the panel protection menu, the afterimage index and the accumulated viewing time, A method for controlling a display device, comprising: determining the reference temperature as a temperature lower than the determined reference temperature, and determining the brightness adjustment value as a higher adjustment value than the determined brightness adjustment value, based on an increase in at least one of the accumulated viewing time and the afterimage index.

15. In Article 11, The detection of the pixel-by-pixel temperature includes obtaining a pixel-by-pixel operation signal of the display driver, detecting the pixel-by-pixel temperature based on the obtained pixel-by-pixel operation signal, and obtaining the highest temperature among the detected pixel-by-pixel temperatures. A method for controlling a display device, wherein controlling the brightness of the display panel comprises controlling the brightness of a plurality of pixels of the display panel based on the determined brightness adjustment value based on the obtained highest temperature being equal to or higher than the determined reference temperature.

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