Display apparatus and method for controlling display apparatus

Abstract

A display apparatus according to the present disclosure comprises: a light-emitting element; and a control unit for controlling, in a first image frame, a driving current applied to the light-emitting element on the basis of first image frame data corresponding to the first image frame, receiving, in the first image frame, a feedback voltage sensed at a cathode of the light-emitting element, and controlling, in a second image frame after the first image frame, the driving current on the basis of second image frame data corresponding to the second image frame and a voltage difference between the feedback voltage and a reference voltage corresponding to the first image frame data.

Description

Display device and control method of the display device

[0001] The disclosed invention relates to a display device and a method for controlling a display device, and more specifically, to a display device and a method for controlling a display device that compensates for the degradation of a plurality of light-emitting elements.

[0002] Generally, a display device is a type of output device that converts acquired or stored electrical information into visual information and displays it to a user, and is used in various fields such as homes and workplaces.

[0003] The display device includes a back light unit (BLU) that provides light to a liquid crystal panel, and the back light unit includes a plurality of light-emitting elements capable of emitting light independently. The light-emitting elements include, for example, light-emitting diodes (LEDs) or organic light-emitting diodes (OLEDs).

[0004] Depending on the type of display device, the display device may include a display panel that displays an image without a backlight unit. The display panel includes a plurality of light-emitting elements capable of emitting light independently, and the plurality of light-emitting elements include a red light-emitting diode, a green light-emitting diode, and a blue light-emitting diode.

[0005] Light-emitting diodes can experience performance degradation due to thermal degradation, and since red, green, and blue light-emitting diodes have different physical characteristics and materials, the degree of performance degradation caused by degradation may differ among them.

[0006] According to the present disclosure, a display device and a method for controlling the display device are provided to compensate for performance degradation caused by the degradation phenomenon of a light-emitting diode.

[0007] According to the present disclosure, a display device and a control method for the display device are provided, which compensate for performance degradation due to a degradation phenomenon according to different standards depending on the type of light-emitting diode.

[0008] According to the present disclosure, a display device and a method for controlling the display device are provided, which can rapidly restore the performance of a light-emitting diode by minimizing the heat generated in the light-emitting diode when the performance of the light-emitting diode deteriorates due to degradation.

[0009] The technical problems to be solved in this document are not limited to those mentioned above, and other unmentioned technical problems will be clearly understood by those skilled in the art to which this invention belongs from the description below.

[0010] A display device according to one or more embodiments of the present disclosure comprises: a light-emitting element; and a control unit that controls a driving current applied to the light-emitting element based on first image frame data corresponding to the first image frame in a first image frame, receives a feedback voltage detected at the cathode of the light-emitting element in the first image frame, and controls the driving current based on second image frame data corresponding to the second image frame and a voltage difference between the feedback voltage and a reference voltage corresponding to the first image frame data in a second image frame after the first image frame.

[0011] A control method for a display device according to one or more embodiments of the present disclosure comprises, in a control method for a display device including a light-emitting element, controlling a driving current applied to the light-emitting element based on first image frame data corresponding to the first image frame in a first image frame, receiving a feedback voltage detected at the cathode of the light-emitting element in the first image frame; and controlling the driving current based on second image frame data corresponding to the second image frame and a voltage difference between the feedback voltage and a reference voltage corresponding to the first image frame data in a second image frame after the first image frame.

[0012] FIG. 1 illustrates an example of the appearance of a display device according to one or more embodiments.

[0013] FIG. 2 illustrates an example of the structure of a display device according to one or more embodiments.

[0014] FIG. 3 illustrates an example of a liquid crystal panel included in a display device according to one or more embodiments.

[0015] FIG. 4 illustrates an example of a backlight unit included in a display device according to one or more embodiments.

[0016] FIG. 5 is a diagram illustrating that a plurality of light-emitting diodes of a backlight unit according to one or more embodiments are divided into dimming blocks.

[0017] FIG. 6 illustrates an example of a display device according to one or more embodiments converting dimming data from image data.

[0018] FIG. 7 is a drawing showing a control block diagram of a display device according to one or more embodiments.

[0019] FIG. 8 illustrates an example of a light-emitting element included in a backlight unit according to one or more embodiments.

[0020] FIG. 9 illustrates configurations for controlling a driving current flowing through a light-emitting element according to one or more embodiments.

[0021] FIG. 10 is a flowchart illustrating an example of a control method for a display device according to one or more embodiments.

[0022] FIG. 11 is a diagram illustrating a reference voltage that changes according to the type of light-emitting diode and RGB color value according to one or more embodiments.

[0023] FIG. 12 illustrates the appearance of light-emitting diodes according to one or more embodiments when they are not degraded.

[0024] FIG. 13 illustrates the deterioration of some of the light-emitting diodes among the light-emitting diodes according to one or more embodiments.

[0025] FIG. 14 illustrates an example of a driving current applied to a light-emitting diode based on the same color value when the light-emitting diode is degraded and when it is not degraded, according to one or more embodiments.

[0026] FIG. 15 illustrates a case where the driving voltage applied to light-emitting diodes according to one or more embodiments is insufficient.

[0027] One or more embodiments of this document and the terms used therein are not intended to limit the technical features described in this document to specific embodiments, and should be understood to include various modifications, equivalents, or substitutions of said embodiments.

[0028] In relation to the description of the drawings, similar reference numerals may be used for similar or related components.

[0029] The singular form of the noun corresponding to the item may include one or multiple items, unless the relevant context clearly indicates otherwise.

[0030] In this document, each of the phrases such as "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 the corresponding phrase, or all possible combinations thereof.

[0031] The term "and / or" includes a combination of multiple related described components or any of the multiple related described components.

[0032] Terms such as "first," "second," or "first" or "second" may be used simply to distinguish a component from another corresponding component and do not limit the components in other aspects (e.g., importance or order).

[0033] Where any (e.g., 1st) component is referred to as "coupled" or "connected" to another (e.g., 2nd) component, with or without the terms "functionally" or "communicationly," it means that said any component may be connected to said other component directly (e.g., via a wire), wirelessly, or through a third component.

[0034] Terms such as "include" or "have" are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in this document, and do not preclude the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0035] When it is said that a component is "connected," "combined," "supported," or "in contact" with another component, this includes not only cases where the components are directly connected, combined, supported, or in contact, but also cases where they are indirectly connected, combined, supported, or in contact through a third component.

[0036] When it is said that a component is located "on" another component, this includes not only cases where one component is in contact with the other, but also cases where another component exists between the two components.

[0037] With respect to any method or process described herein, identification codes may be used for convenience of description but are not intended to indicate the order of each step or operation. Each step or operation may be implemented in a different order than the one depicted unless otherwise clearly indicated in the context. One or more steps or operations may be omitted unless otherwise clearly indicated in the context of this disclosure.

[0038] Hereinafter, embodiments according to the present invention will be described with reference to the attached drawings.

[0039] FIG. 1 illustrates an example of the appearance of a display device according to one or more embodiments.

[0040] Referring to FIG. 1, the display device (10) is a device capable of processing a video signal received from the outside and visually displaying the processed video. In the following examples, the display device (10) is exemplified as a television (TV), but is not limited thereto. For example, the display device (10) can be implemented in various forms such as a monitor, a portable multimedia device, a portable communication device, etc., and the form of the display device (10) is not limited as long as it is a device that visually displays video.

[0041] In addition, the display device (10) may be a large format display (LFD) installed outdoors, such as on a building rooftop or at a bus stop. Here, the outdoor area is not necessarily limited to an open space; the display device (10) according to one or more embodiments may be installed in any indoor space where many people can enter and exit, such as a subway station, shopping mall, movie theater, company, or store.

[0042] The display device (10) receives content including video signals and audio signals from various content sources and can output video and audio corresponding to the video signals and audio signals. For example, the display device (10) can receive content data through a broadcast receiving antenna or a wired cable, receive content data from a content playback device, or receive content data from a content provider's content provision server.

[0043] As illustrated in FIG. 1, the display device (10) may include a main body (11) and a screen (12) that displays an image (I).

[0044] The main body (11) forms the outer shape of the display device (10), and components for the display device (10) to display an image (I) or perform various functions may be provided inside the main body (11). The main body (11) shown in FIG. 1 is in the shape of a flat plate, but the shape of the main body (11) is not limited to that shown in FIG. 1. For example, the main body (11) may be in the shape of a curved plate.

[0045] A screen (12) is formed on the front of the main body (11) and can display an image (I). For example, the screen (12) can display a still image or a video. Additionally, the screen (12) can display a two-dimensional flat image or a three-dimensional stereoscopic image using the parallax of the user's two eyes.

[0046] The screen (12) may include a liquid crystal panel capable of passing through or blocking light emitted by a back light unit (BLU), etc.

[0047] A plurality of pixels (P) are formed on the screen (12), and an image (I) displayed on the screen (12) can be formed by light emitted by each of the plurality of pixels (P). For example, an image (I) can be formed on the screen (12) by combining the light emitted by each of the plurality of pixels (P) as if in a mosaic.

[0048] Each of the plurality of pixels (P) can emit light of various brightness and various colors. In order to emit light of various colors, each of the plurality of pixels (P) may include subpixels (PR, PG, PB).

[0049] The subpixels (PR, PG, PB) may include a red subpixel (PR) capable of emitting red light, a green subpixel (PG) capable of emitting green light, and a blue subpixel (PB) capable of emitting blue light. For example, red light may represent light with a wavelength of approximately 700 nm (nanometer, one-billionth of a meter) to 800 nm. Green light may represent light with a wavelength of approximately 500 nm to 600 nm. Blue light may represent light with a wavelength of approximately 400 nm to 500 nm.

[0050] By combining the red light of the red subpixel (PR), the green light of the green subpixel (PG), and the blue light of the blue subpixel (PB), light of various brightness and various colors can be emitted from each of the multiple pixels (P).

[0051] Meanwhile, according to one or more embodiments, if the display device (10) is a self-emissive display device, the backlight unit itself may be used as a display panel including a red light-emitting diode that outputs red light, a green light-emitting diode that outputs green light, and a blue light-emitting diode that outputs blue light. According to one or more embodiments, if the display device (10) is a self-emissive display device, the display device (10) may not include a liquid crystal panel.

[0052] FIG. 2 illustrates an example of the structure of a display device according to one or more embodiments, and FIG. 3 illustrates an example of a liquid crystal panel included in a display device according to one or more embodiments.

[0053] As shown in FIG. 2, various components for generating an image (I) on a screen (12) may be provided inside the main body (11).

[0054] For example, the main body (11) is provided with a backlight unit (or light source device) (100) which is a surface light source, a liquid crystal panel (20) that blocks or passes light emitted from the backlight unit (100), a control assembly (50) that controls the operation of the backlight unit (100) and the liquid crystal panel (20), and a power assembly (60) that supplies power to the backlight unit (100) and the liquid crystal panel (20). Additionally, the main body (11) may include a bezel (13) for supporting the liquid crystal panel (20), the backlight unit (100), the control assembly (50), and the power assembly (60), a frame middle mold (14), a bottom chassis (15), and a rear cover (16).

[0055] The backlight unit (100) may include a point light source that emits white light. Additionally, the backlight unit (100) may refract, reflect, and scatter light to convert the light emitted from the point light source into uniform surface light. In this way, the backlight unit (100) can emit uniform surface light toward the front by refracting, reflecting, and scattering the light emitted from the point light source.

[0056] The backlight unit (100) is described in more detail below.

[0057] A liquid crystal panel (20) is provided in front of a backlight unit (100) and blocks or passes light emitted from the backlight unit (100) to form an image (I).

[0058] The front surface of the liquid crystal panel (20) forms the screen (12) of the display device (10) described above, and the liquid crystal panel (20) can form a plurality of pixels (P). The plurality of pixels (P) of the liquid crystal panel (20) can each independently block or allow light from the backlight unit (100) to pass through. In addition, the light passed through the plurality of pixels (P) can form an image (I) displayed on the screen (12).

[0059] For example, as shown in FIG. 3, the liquid crystal panel (20) may include a first polarizing film (21), a first transparent substrate (22), a pixel electrode (23), a thin film transistor (24), a liquid crystal layer (25), a common electrode (26), a color filter (27), a second transparent substrate (28), and a second polarizing film (29).

[0060] The first transparent substrate (22) and the second transparent substrate (28) can fix and support a pixel electrode (23), a thin-film transistor (24), a liquid crystal layer (25), a common electrode (26), and a color filter (27). These first and second transparent substrates (22, 28) may be composed of reinforced glass or a transparent resin.

[0061] A first polarizing film (21) and a second polarizing film (29) are provided on the outer side of the first and second transparent substrates (22, 28). The first polarizing film (21) and the second polarizing film (29) can each pass a specific polarization and block (reflect or absorb) other polarizations. For example, the first polarizing film (21) can pass polarization of a first direction and block (reflect or absorb) other polarizations. Also, the second polarizing film (29) can pass polarization of a second direction and block (reflect or absorb) other polarizations. At this time, the first direction and the second direction may be orthogonal to each other. As a result, polarization that has passed through the first polarizing film (21) cannot directly pass through the second polarizing film (29).

[0062] A color filter (27) may be provided on the inner side of the second transparent substrate (28). The color filter (27) may include, for example, a red filter (27R) that passes red light, a green filter (27G) that passes green light, and a blue filter (27B) that passes blue light. Additionally, the red filter (27R), the green filter (27G), and the blue filter (27B) may be arranged side by side. The area occupied by the color filter (27) corresponds to the pixel (P) described above. The area occupied by the red filter (27R) corresponds to the red subpixel (PR), the area occupied by the green filter (27G) corresponds to the green subpixel (PG), and the area occupied by the blue filter (27B) corresponds to the blue subpixel (PB).

[0063] The pixel electrode (23) may be provided on the inner side of the first transparent substrate (22), and the common electrode (26) may be provided on the inner side of the second transparent substrate (28). The pixel electrode (23) and the common electrode (26) are made of an electrically conductive metal material and can generate an electric field to change the arrangement of liquid crystal molecules (115a) constituting the liquid crystal layer (25) described below.

[0064] A thin film transistor (TFT) (24) is provided on the inner side of the second transparent substrate (22). The thin film transistor (24) can be turned on (closed) or turned off (open) by image data provided from the panel driver (30). Additionally, depending on the turn-on (closed) or turn-off (open) of the thin film transistor (24), an electric field can be formed or removed between the pixel electrode (23) and the common electrode (26).

[0065] The liquid crystal layer (25) is formed between the pixel electrode (23) and the common electrode (26) and is filled with liquid crystal molecules (25a). The liquid crystal may exhibit an intermediate state between a solid (crystal) and a liquid. The liquid crystal may exhibit optical properties depending on changes in the electric field. For example, the direction of the molecular arrangement constituting the liquid crystal may change depending on changes in the electric field. Consequently, the optical properties of the liquid crystal layer (25) may vary depending on the presence or absence of the electric field passing through the liquid crystal layer (25). For example, the liquid crystal layer (25) may rotate the polarization direction of light around the optical axis depending on the presence or absence of the electric field. Accordingly, the polarization that has passed through the first polarizing film (21) has its polarization direction rotated while passing through the liquid crystal layer (25) and can pass through the second polarizing film (29).

[0066] On one side of the liquid crystal panel (20), a cable (20a) for transmitting video data to the liquid crystal panel (20) and a display driver integrated circuit (DDI) (30) (hereinafter referred to as 'panel driver') for processing digital video data and outputting an analog video signal are provided.

[0067] The cable (20a) electrically connects the control assembly (50) / power assembly (60) and the panel driver (30), and can also electrically connect the panel driver (30) and the liquid crystal panel (20). The cable (20a) may include a flexible flat cable or a film cable, etc.

[0068] The panel driver (30) can receive image data and power from the control assembly (50) / power assembly (60) through the cable (20a). Additionally, the panel driver (30) can provide image data and driving current to the liquid crystal panel (20) through the cable (20a).

[0069] Additionally, the cable (20a) and the panel driver (30) can be implemented as a single unit using a film cable, a chip on film (COF), a tape carrier packet (TCP), etc. In other words, the panel driver (30) can be placed on the cable (20b). However, it is not limited thereto, and the panel driver (30) can be placed on the liquid crystal panel (20).

[0070] The control assembly (50) may include a control circuit that controls the operation of the liquid crystal panel (20) and the backlight unit (100). For example, the control circuit may process video signals and / or audio signals received from an external content source. The control circuit may transmit video data to the liquid crystal panel (20) and dimming data to the backlight unit (100).

[0071] The power assembly (60) may include a power circuit that supplies power to the liquid crystal panel (20) and the backlight unit (100). The power circuit may supply power to the control assembly (50), the backlight unit (100), and the liquid crystal panel (20).

[0072] The control assembly (50) and the power assembly (60) may be implemented with a printed circuit board and various circuits mounted on the printed circuit board. For example, the power circuit may include a capacitor, a coil, a resistor, a processor, etc., and a power circuit board on which these are mounted. Additionally, the control circuit may include a memory, a processor, and a control circuit board on which these are mounted.

[0073] FIG. 4 illustrates an example of a backlight unit (100) included in a display device (10) according to one or more embodiments, and FIG. 5 is a drawing for explaining that a plurality of light-emitting diodes of a backlight unit (100) according to one or more embodiments are divided into dimming blocks.

[0074] As illustrated in FIG. 4, the backlight unit (100) may include a light source module (110) that generates light, a reflective sheet (120) that reflects light, a diffuser plate (130) that diffuses light uniformly, and an optical sheet (140) that improves the brightness of the emitted light.

[0075] A light source module (110) may include a plurality of light-emitting elements (or light sources) (111) that emit light, and a substrate (112) that supports / fixes the plurality of light-emitting elements (111).

[0076] A plurality of light-emitting elements (111) can be arranged in a predetermined pattern so that light is emitted with uniform brightness. A plurality of light-emitting elements (111) can be arranged so that the distance between one light source and adjacent light sources becomes equal.

[0077] For example, as illustrated in FIG. 4, a plurality of light-emitting elements (111) can be arranged in rows and columns. For example, a plurality of light sources can be arranged so that a square is formed by four adjacent light sources. Also, one light source is placed adjacent to four light sources, and the distance between one light source and the four light sources adjacent to it can be approximately the same.

[0078] In addition, according to an embodiment, a plurality of light sources may be arranged so that an approximately equilateral triangle is formed by three adjacent light sources. In this case, one light source may be arranged adjacent to six light sources. Also, the distance between one light source and the six light sources adjacent to it may be approximately the same.

[0079] However, the arrangement of the plurality of light-emitting elements (111) is not limited to the arrangement described above, and the plurality of light-emitting elements (111) can be arranged in various ways so that light is emitted with uniform brightness.

[0080] The light-emitting element (111) may employ a device capable of emitting monochromatic light (light of a specific wavelength, e.g., blue light) or white light (e.g., light mixed with red, green, and blue light) in various directions when power is supplied. For example, the light-emitting element (111) may include a light-emitting diode (LED). The light-emitting diode may be implemented in various sizes and may include, for example, Mini LEDs and / or Micro LEDs.

[0081] The substrate (112) can fix a plurality of light-emitting elements (111) so that the position of the light-emitting elements (111) is not changed. In addition, the substrate (112) can supply power to each light-emitting element (111) for the light-emitting elements (111) to emit light.

[0082] The substrate (112) may include a synthetic resin and / or reinforced glass and / or a printed circuit board (PCB) having a conductive power supply line formed therein to fix a plurality of light-emitting elements (111) and to supply power to the light-emitting elements (111).

[0083] The reflective sheet (120) can reflect light emitted from a plurality of light-emitting elements (111) forward or in a direction close to the forward.

[0084] A plurality of through holes (120a) are formed in the reflective sheet (120) at positions corresponding to each of the plurality of light-emitting elements (111) of the light source module (110). Additionally, the light-emitting elements (111) of the light source module (110) can pass through the through holes (120a) and protrude forward from the reflective sheet (120).

[0085] For example, during the assembly process of the reflective sheet (120) and the light source module (110), a plurality of light-emitting elements (111) of the light source module (110) are inserted into a plurality of through holes (120a) formed in the reflective sheet (120). As a result, the substrate (112) of the light source module (110) is located at the rear of the reflective sheet (120), but the plurality of light-emitting elements (111) of the light source module (110) can be located at the front of the reflective sheet (120).

[0086] Accordingly, a plurality of light-emitting elements (111) can emit light in front of the reflective sheet (120).

[0087] A plurality of light-emitting elements (111) can emit light in various directions in front of the reflective sheet (120). The light can be emitted from the light-emitting elements (111) toward the diffuser plate (130) as well as from the light-emitting elements (111) toward the reflective sheet (120), and the reflective sheet (120) can reflect the light emitted toward the reflective sheet (120) toward the diffuser plate (130).

[0088] Light emitted from the light-emitting element (111) passes through various objects such as a diffuser plate (130) and an optical sheet (140). When the light passes through the diffuser plate (130) and the optical sheet (140), some of the incident light is reflected from the surface of the diffuser plate (130) and the optical sheet (140). A reflective sheet (120) can reflect the light reflected by the diffuser plate (130) and the optical sheet (140).

[0089] A diffuser plate (130) can be provided in front of the light source module (110) and the reflective sheet (120) and can evenly disperse light emitted from the light-emitting element (111) of the light source module (110).

[0090] As previously explained, a plurality of light-emitting elements (111) are located at various points on the rear of the backlight unit (100). Although the plurality of light-emitting elements (111) are arranged at equal intervals on the rear of the backlight unit (100), non-uniformity in brightness may occur depending on the position of the plurality of light-emitting elements (111).

[0091] The diffuser plate (130) can diffuse light emitted from a plurality of light-emitting elements (111) within the diffuser plate (130) to eliminate non-uniformity in brightness caused by a plurality of light-emitting elements (111). In other words, the diffuser plate (130) can uniformly emit non-uniform light from a plurality of light-emitting elements (111) to the front.

[0092] The optical sheet (140) may include various sheets to improve brightness and uniformity of brightness. For example, the optical sheet (140) may include a diffusion sheet (141), a first prism sheet (142), a second prism sheet (143), a reflective polarizing sheet (144), etc.

[0093] The diffusion sheet (141) diffuses light for uniform brightness. Light emitted from the light-emitting element (111) is diffused by the diffusion plate (130) and can be diffused again by the diffusion sheet (141) included in the optical sheet (140).

[0094] The first and second prism sheets (142, 143) can increase brightness by concentrating light diffused by the diffusion sheet (141). The first and second prism sheets (142, 143) include a prism pattern in the shape of a triangular prism, and a plurality of these prism patterns are arranged adjacently to form a plurality of band shapes.

[0095] A reflective polarizing sheet (144) is a type of polarizing film that can transmit some of the incident light and reflect others to improve brightness. For example, it can transmit polarization in the same direction as a predetermined polarization direction of the reflective polarizing sheet (144) and reflect polarization in a direction different from the polarization direction of the reflective polarizing sheet (144). In addition, the light reflected by the reflective polarizing sheet (144) is recycled inside the backlight unit (100), and the brightness of the display device (10) can be improved through this light recycling.

[0096] The optical sheet (140) is not limited to the sheet or film shown in FIG. 4 and may include a wider variety of sheets or films, such as a protective sheet.

[0097] The backlight unit (100) includes a plurality of light-emitting elements (111) and can output surface light by diffusing light emitted from a plurality of light sources (111). The liquid crystal panel (20) includes a plurality of pixels and can control the plurality of pixels so that each of the plurality of pixels allows light to pass through or blocks light. An image can be formed by the light passing through each of the plurality of pixels.

[0098] At this time, the display device (10) can perform local dimming by varying the brightness of light in different areas of the backlight unit (100) in conjunction with the output image so as to improve power consumption while increasing the contrast ratio.

[0099] For example, the display device (10) may reduce the brightness of the light of the light-emitting element (111) of the backlight unit (100) corresponding to the dark part of the image to make the dark part of the image darker, and may increase the brightness of the light-emitting element (111) of the backlight unit (100) corresponding to the bright part of the image to make the bright part of the image brighter. By doing so, the contrast ratio or brightness ratio of the image may be improved.

[0100] The display device (10) divides the backlight unit (100) into multiple blocks and independently controls the current for each block according to the input image. The image transmission of the display device (10) is carried out by a method of local dimming driving per frame, and the driving of the current is controlled according to the number of blocks of the light-emitting element (111) divided within the backlight unit (100).

[0101] As a result, the display device (10) can effectively improve the contrast ratio by lowering the supply current to the dimming block in the dark area of ​​the input image and increasing the supply current to the dimming block in the bright area of ​​the input image.

[0102] For local dimming, a plurality of light-emitting elements (111) included in the backlight unit (100) may be divided into a plurality of dimming blocks (200). For example, as shown in FIG. 5, the plurality of dimming blocks (200) may be composed of 5 rows and 12 columns, for a total of 60. As another example, the plurality of dimming blocks (200) may be composed of 5 rows and 4 columns, for a total of 20. However, the number of dimming blocks (200) is not limited to the above examples.

[0103] Referring to FIG. 5, each of the plurality of dimming blocks (200) may include at least one light-emitting element (111). The backlight unit (100) may supply the same driving current to the light-emitting elements (111) belonging to the same dimming block (200), and the light-emitting elements (111) belonging to the same dimming block (200) may emit light of the same brightness.

[0104] Additionally, the backlight unit (100) can supply different driving currents to light-emitting elements (111) belonging to different dimming blocks (200) according to dimming data, and the light-emitting elements (111) belonging to different dimming blocks (200) can emit light of different brightness.

[0105] As will be explained below, among the light-emitting elements (111) belonging to the same dimming block (200), different driving currents can be supplied to light-emitting diodes that output light of different colors, and the same driving current can be supplied to light-emitting diodes that output light of the same color. To this end, the dimming data corresponding to one dimming block may include RGB color values.

[0106] Each of the plurality of dimming blocks (200) may include N*M light sources arranged in the form of an N*M matrix (N and M are natural numbers), for example. An N*M matrix means a matrix having N rows and M columns.

[0107] Since each light-emitting element (111) includes a light-emitting diode, each of the plurality of dimming blocks (200) may include N*M light-emitting diodes. That is, each of the plurality of dimming blocks (200) may include a predetermined number of light-emitting elements (111).

[0108] A plurality of dimming blocks (200) can be placed on the substrate (112). That is, N*M light-emitting diodes can be placed on the substrate (112).

[0109] FIG. 6 is a diagram showing a control block diagram of a display device according to one or more embodiments, and FIG. 7 illustrates an example of a display device according to one or more embodiments converting dimming data from image data.

[0110] Referring to FIG. 6, the display device (10) may include a content receiving unit (80), an image processing unit (90), a panel driver (30), a liquid crystal panel (20), and a backlight unit (100). At this time, the backlight unit (100) may include a dimming driver (170) that performs local dimming and a driving element (300) that drives a light-emitting element (111). This driving element (300) may be placed on the upper surface of the substrate (112) or on the lower surface of the substrate (112).

[0111] The content receiving unit (80) may include a receiving terminal (81) and a tuner (82) for receiving content including video signals and / or audio signals from content sources.

[0112] The receiving terminal (81) can receive video and audio signals from content sources through a cable. For example, the receiving terminal (81) may include a component (YPbPr / RGB) terminal, a composite (composite video blanking and sync, CVBS) terminal, an audio terminal, a High Definition Multimedia Interface (HDMI) terminal, a Universal Serial Bus (USB) terminal, etc.

[0113] The tuner (82) receives broadcast signals from a broadcast receiving antenna or a wired cable and can extract broadcast signals of a channel selected by the user among the broadcast signals. For example, the tuner (82) can pass broadcast signals having a frequency corresponding to a channel selected by the user among a plurality of broadcast signals received through a broadcast receiving antenna or a wired cable, and block broadcast signals having other frequencies.

[0114] In this way, the content receiving unit (80) can receive an image including video signals and audio signals from content sources through the receiving terminal (81) and / or tuner (82), and can output the input image received through the receiving terminal (81) and / or tuner (82) to the image processing unit (90).

[0115] The image processing unit (90) may include at least one processor (91) for processing an input image (image data) and a memory (92) for storing / remembering data.

[0116] The memory (92) stores programs and data for processing video signals and / or audio signals, and can temporarily store data generated while processing video signals and / or audio signals.

[0117] The memory (92) may include non-volatile memory such as ROM (Read Only Memory) and flash memory, and volatile memory such as S-RAM (Static Random Access Memory, S-RAM) and D-RAM (Dynamic Random Access Memory).

[0118] At least one processor (91) receives an input image including a video signal and / or an audio signal from a content receiving unit (80), can decode the video signal into image data, and can generate dimming data from the image data. The image data and the dimming data can be output to a panel driver (30) and a dimming driver (170), respectively.

[0119] At least one processor (91) can provide dimming data for local dimming to a backlight unit (100). The dimming data may include information regarding the brightness of each of the plurality of dimming blocks (200). For example, the dimming data may include information regarding the intensity of light output by a light-emitting element (111) included in each of the plurality of dimming blocks (200). That is, the dimming data may include information regarding the magnitude of the current supplied to the light-emitting element (111) included in each of the plurality of dimming blocks (200).

[0120] The dimming data may include information regarding the magnitude of the current supplied to each of the red light-emitting diode, green light-emitting diode, and blue light-emitting diode included in the light-emitting element (111) included in each of the plurality of dimming blocks (200).

[0121] At least one processor (91) can calculate the average of the RGB color values ​​of each of the plurality of dimming blocks (200) based on image data and generate dimming data for each of the plurality of dimming blocks (200) based on the average of the RGB color values.

[0122] At least one processor (91) can obtain dimming data from video data decoded from a video signal.

[0123] The processor (91) can convert image data into dimming data in various ways. For example, as shown in FIG. 7, the processor (91) can divide an image (I) based on image data into a plurality of image blocks (IB). The number of the plurality of image blocks (IB) is equal to the number of the plurality of dimming blocks (200), and each of the plurality of image blocks (IB) can correspond to the plurality of dimming blocks (200).

[0124] The processor (91) can obtain a luminance value (L) of a plurality of dimming blocks (200) from image data of a plurality of image blocks (IB). The luminance value (L) of the plurality of dimming blocks (200) may include RGB color values ​​of the plurality of dimming blocks (200).

[0125] The processor (91) can generate dimming data by combining the brightness values ​​(L) of a plurality of dimming blocks (200).

[0126] For example, the processor (91) can obtain the luminance value (L) of each of the plurality of dimming blocks (200) based on the maximum value among the luminance values ​​of the pixels included in each of the image blocks (IB).

[0127] A single image block includes multiple pixels, and the image data of a single image block may include image data of multiple pixels (e.g., red data, green data, blue data, etc.). The processor (91) can calculate the luminance value of each pixel based on the image data of each pixel.

[0128] The processor (91) can set the maximum value among the luminance values ​​of each pixel included in the image block as the luminance value of the dimming block corresponding to the image block. For example, the processor (91) can set the maximum value among the luminance values ​​of the pixels included in the i-th image block (IB(i)) as the luminance value (L(i)) of the i-th dimming block, and the maximum value among the luminance values ​​of the pixels included in the j-th image block (IB(j)) as the luminance value (L(j)) of the j-th dimming block.

[0129] The processor (91) can generate dimming data by combining the brightness values ​​of a plurality of dimming blocks (200).

[0130] In this way, the image processing unit (90) can decode the video signal obtained by the content receiving unit (80) into image data and generate dimming data from the image data. Additionally, the image processing unit (90) can transmit the image data and dimming data to the liquid crystal panel (20) and the light source device (100), respectively.

[0131] The liquid crystal panel (20) includes a plurality of pixels capable of transmitting or blocking light, and the plurality of pixels are arranged in a matrix form. In other words, the plurality of pixels can be arranged in a plurality of rows and a plurality of columns.

[0132] The panel driver (30) receives image data from the image processing unit (90) and can drive the liquid crystal panel (20) according to the image data. In other words, the panel driver (30) can convert image data (hereinafter referred to as 'digital image data'), which is a digital signal, into an analog image signal, which is an analog voltage signal, and provide the converted analog image signal to the liquid crystal panel (20). According to the analog image signal, the optical properties (e.g., light transmittance) of a plurality of pixels included in the liquid crystal panel (20) can change.

[0133] The panel driver (30) may include, for example, a timing controller, a data driver, a scan driver, etc.

[0134] The timing controller receives image data from the image processing unit (90) and can output the image data and a drive control signal to the data driver and the scan driver. The drive control signal may include a scan control signal and a data control signal, and the scan control signal and the data control signal may be used to control the operation of the scan driver and the operation of the data driver, respectively.

[0135] The scan driver receives a scan control signal from the timing controller and can input-activate one of a plurality of rows in the liquid crystal panel (20) according to the scan control signal. In other words, the scan driver converts the pixels included in one of a row among a plurality of pixels arranged in a plurality of rows and a plurality of columns into a state where they can receive an analog image signal. At this time, pixels other than those input-activated by the scan driver cannot receive an analog image signal.

[0136] The data driver receives image data and a data control signal from the timing controller and can output the image data to the liquid crystal panel (20) according to the data control signal. For example, the data driver can receive digital image data from the timing controller and convert the digital image data into an analog image signal. Additionally, the data driver can provide an analog image signal to pixels included in any row that is input-activated by the scan driver. At this time, the pixels input-activated by the scan driver receive the analog image signal, and the optical properties (e.g., light transmittance) of the input-activated pixels change according to the received analog image signal.

[0137] In this way, the panel driver (30) can drive the liquid crystal panel (20) according to the image data. Accordingly, an image corresponding to the image data can be displayed on the liquid crystal panel (20).

[0138] The light source device (100) includes a plurality of light sources (111) that emit light, and the plurality of light sources (111) are arranged in a mastrick form. In other words, the plurality of light sources (111) can be arranged in a plurality of rows and a plurality of columns. Additionally, the light source device (100) can be divided into a plurality of dimming blocks (200), and each of the plurality of dimming blocks (200) can include at least one light source.

[0139] The dimming driver (170) receives dimming data from the image processing unit (90) and can drive the light source device (100) according to the dimming data. Here, the dimming data may include information regarding the luminance of each of the plurality of dimming blocks (200) or information regarding the brightness of the light sources included in each of the plurality of dimming blocks (200).

[0140] The dimming driver (170) can convert dimming data, which is a digital signal, into an analog dimming signal, which is an analog voltage signal, and provide the analog dimming signal to the light source device (100). Depending on the analog dimming signal, the intensity of light emitted by the light sources included in each of the plurality of dimming blocks (200) can change.

[0141] In particular, the dimming driver (170) may not directly provide an analog dimming signal to all of the multiple dimming blocks (200), but may sequentially provide an analog dimming signal to the multiple dimming blocks (200) in an active matrix manner.

[0142] As previously described, a plurality of dimming blocks (200) can be arranged in a mastrick form in the light source device (100). In other words, a plurality of dimming blocks (200) can be arranged in a plurality of rows and a plurality of columns in the light source device (100).

[0143] The dimming driver (170) can sequentially provide analog dimming signals to dimming blocks belonging to each of a plurality of rows or sequentially provide analog dimming signals to dimming blocks belonging to each of a plurality of columns.

[0144] For example, the dimming driver (170) can input-activate dimming blocks belonging to one row of a plurality of dimming blocks (200) and provide an analog dimming signal to the input-activated dimming blocks. Subsequently, the dimming driver (170) can input-activate dimming blocks belonging to another row of a plurality of dimming blocks (200) and provide an analog dimming signal to the input-activated dimming blocks.

[0145] The dimming driver (170) receives dimming data from the image processing unit (90) and can drive the driving element (300) according to the dimming data.

[0146] The driving element (300) may be configured to control at least one dimming block among a plurality of dimming blocks (200). The driving element (300) may control the dimming block (200) based on a control signal received from the dimming driver (170).

[0147] The driving element (300) may be referred to as a driving IC or a pixel IC, etc., in the sense that it is an integrated circuit for driving at least one of the plurality of dimming blocks (200).

[0148] FIG. 8 illustrates an example of a light-emitting element included in a backlight unit according to one or more embodiments.

[0149] Referring to FIG. 8, the light-emitting element (111) may include a red light-emitting diode (190R), a green light-emitting diode (190G), and a blue light-emitting diode (190B).

[0150] The red light-emitting diode (190R) may include at least one red light-emitting diode connected in series with each other. The green light-emitting diode (190G) may include at least one green light-emitting diode connected in series with each other. The blue light-emitting diode (190B) may include at least one blue light-emitting diode connected in series with each other.

[0151] In the present invention, the anode of the light-emitting diode (190R, 190G, 190B) may refer to the anode of the first light-emitting diode among at least one light-emitting diode connected in series, the anode of which is not connected to another light-emitting diode.

[0152] In the present invention, the cathode of the light-emitting diode (190R, 190G, 190B) may refer to the cathode of the last light-emitting diode among at least one light-emitting diode connected in series, the cathode of which is not connected to another light-emitting diode.

[0153] A plurality of light-emitting diode groups (175) can be arranged in a two-dimensional matrix form on the upper surface of the substrate (112). That is, as shown in FIG. 4, as a plurality of light-emitting elements (111) are arranged in rows and columns, a plurality of light-emitting diode groups (175) can be arranged in a two-dimensional matrix form.

[0154] In addition, according to an embodiment, a plurality of light sources may be arranged so that an approximately equilateral triangle is formed by three adjacent light sources. In this case, one light source may be arranged adjacent to six light sources. Also, the distance between one light source and the six light sources adjacent to it may be approximately the same.

[0155] However, the arrangement of the plurality of light-emitting elements (111) is not limited to the arrangement described above, and the plurality of light-emitting elements (111) can be arranged in various ways so that light is emitted with uniform brightness.

[0156] The light-emitting element (111) may employ a device capable of emitting white light (light having multiple peak wavelengths, for example, light mixed with red light, green light, and blue light) in various directions when power is supplied.

[0157] That is, one light-emitting element (111) can emit white light by including a red light-emitting diode (190R), a green light-emitting diode (190G), and a blue light-emitting diode (190B).

[0158] The intensity of red light emitted by the red light-emitting diode (190R), the intensity of green light emitted by the green light-emitting diode (190G), and the intensity of blue light emitted by the blue light-emitting diode (190B) can each be changed independently based on dimming data.

[0159] As shown in FIG. 8, each of the plurality of light-emitting elements (111) may include a group of light-emitting diodes (175) and an optical dome (180).

[0160] The thickness of the backlight unit (100) can also be reduced so that the thickness of the display device (10) is reduced. Each of the plurality of light-emitting elements (111) is reduced so that the thickness of the backlight unit (100) is reduced, and the structure is simplified.

[0161] Each light-emitting diode included in the light-emitting diode group (175) may include a P-type semiconductor and an N-type semiconductor for emitting light by the recombination of holes and electrons. Additionally, the light-emitting diode (1101) may be provided with a pair of electrodes for supplying holes and electrons to the P-type semiconductor and the N-type semiconductor, respectively.

[0162] Each of the light-emitting diodes (190R, 190G, 190B; 190) can be configured to convert electrical energy into light energy. Each of the light-emitting diodes (190R, 190G, 190B; 190) can emit light having a maximum intensity at a predetermined wavelength based on the supplied power. For example, a blue light-emitting diode (190B) can emit blue light having a peak value at a wavelength representing blue (e.g., a wavelength between 430 nm and 495 nm).

[0163] For example, a multilayer reflective structure in which multiple insulating films having different refractive indices are alternately stacked can be provided on the front surface of each light-emitting diode (190R, 190G, 190B; 190). For example, such a multilayer reflective structure can be composed of a Distributed Bragg Reflector (DBR). A Distributed Bragg Reflector (DBR) is a structure in which two or more materials having different refractive indices are alternately stacked, and it may refer to an optical device that exhibits high reflectivity for light of a specific wavelength according to the principle of inducing strong reflection in a specific frequency band by forming an optical path difference for each wavelength.

[0164] Additionally, the light-emitting diodes (190R, 190G, 190B; 190) of the light-emitting diode group (175) can be directly attached to the substrate (112) in a Chip On Board (COB) manner. For example, the light-emitting element (111) may include a light-emitting diode (190) in which the light-emitting diode chip or light-emitting diode die is directly attached to the substrate (112) without separate packaging.

[0165] The light-emitting diode (190) can be manufactured as a flip-chip type. When attaching the light-emitting diode (190), which is a semiconductor device, to the substrate (112), the electrode pattern of the semiconductor device can be fused directly to the substrate (112) without using an intermediate medium such as a metal lead (wire) or a ball grid array (BGA). In this way, as the metal lead (wire) or ball grid array is omitted, the light-emitting device (111) including the flip-chip type light-emitting diode (190) can be miniaturized.

[0166] In the above description, a flip-chip type light-emitting diode (190) that is directly fused to a substrate (112) in a chip-on-board manner has been described, but the light-emitting element (111) is not limited to a flip-chip type light-emitting diode. For example, the light-emitting element (111) may include a package type light-emitting diode.

[0167] The optical dome (180) can cover the group of light-emitting diodes (175). That is, the optical dome (180) can cover the red light-emitting diode (190R), the green light-emitting diode (190G), and the blue light-emitting diode (190B) included in the group of light-emitting diodes (175).

[0168] The optical dome (180) causes the red light, green light, and blue light emitted from the red light-emitting diode (190R), green light-emitting diode (190G), and blue light-emitting diode (190B), respectively, to refract and mix, thereby allowing white light to be emitted.

[0169] In this way, the optical dome (180) emits white light by mixing red light, green light, and blue light, thereby reducing the distance at which the white light is mixed compared to when there is no optical dome (180), and thus reducing the optical distance (OD) for converting a point light source into a surface light source.

[0170] Additionally, the optical dome (180) can prevent or suppress damage to the light-emitting diode (190) caused by external mechanical action and / or damage to the light-emitting diode (190) caused by chemical action.

[0171] The optical dome (180) may have a dome shape, for example, by cutting a sphere with a surface that does not include its center, or a hemispherical shape, by cutting a sphere with a surface that includes its center. The vertical cross-section of the optical dome (180) may be, for example, arc-shaped or semicircular.

[0172] The optical dome (180) may be composed of silicone or epoxy resin. For example, molten silicone or epoxy resin may be discharged onto a light-emitting diode (190) through a nozzle, and then the discharged silicone or epoxy resin may be cured to form the optical dome (180).

[0173] The optical dome (180) may be optically transparent or translucent. Light emitted from the light-emitting diode (190) may pass through the optical dome (180) and be emitted to the outside.

[0174] At this time, the dome-shaped optical dome (180) can refract light like a lens. For example, light emitted from a light-emitting diode (190) can be dispersed by being refracted by the optical dome (180).

[0175] Thus, the optical dome (180) can not only protect the light-emitting diode (190) from external mechanical and / or chemical or electrical action, but also disperse the light emitted from the light-emitting diode (190).

[0176] In the above description, an optical dome (180) in the form of a silicon dome has been described, but the light-emitting element (111) is not limited to including the optical dome (180). For example, the light-emitting element (111) may include a lens for dispersing light emitted from a light-emitting diode.

[0177] As such, according to the present invention, by including a red light-emitting diode (190R), a green light-emitting diode (190G), and a blue light-emitting diode (190B) in the local dimming operation, it is possible to achieve higher color purity and contrast ratio than local dimming using a single light, and to achieve higher image quality.

[0178] The embodiments described below can also be applied to self-emissive display devices in which the display panel itself includes light-emitting elements (111) (e.g., a red light-emitting diode (190R), a green light-emitting diode (190G), and a blue light-emitting diode (190B)) and does not have a separate backlight unit.

[0179] In the present invention, if a display device (10) according to one or more embodiments is equipped with a backlight unit (100), 'image frame data' may mean dimming data, and if a display device (10) according to one or more embodiments is not equipped with a backlight unit (100), 'image frame data' may mean image data.

[0180] In the present invention, image frame data may refer to data containing color values ​​(e.g., RGB color values) for a light-emitting element (111) (e.g., red light-emitting diode (190R), green light-emitting diode (190G), and blue light-emitting diode (190B)).

[0181] In the present invention, the RGB color values ​​may include an R value corresponding to the luminance value of a red light-emitting diode (190R), a G value corresponding to the luminance value of a green light-emitting diode (190G), and a B value corresponding to the luminance value of a blue light-emitting diode (190B).

[0182] Each of the R, G, and B values ​​may have a data value (or luminance value) within a predetermined range (e.g., 0 to 255) corresponding to the luminance.

[0183] FIG. 9 illustrates configurations for controlling a driving current flowing through a light-emitting element according to one or more embodiments.

[0184] Referring to FIG. 9, the display device (10) may include a control unit (150) for controlling the driving current flowing through the light-emitting element (111). At least one processor of the control unit (150) can perform various functions by individually or collectively executing computer-executable instructions stored in at least one memory.

[0185] The control unit (150) may include at least one processor and at least one memory for controlling the light-emitting element (111).

[0186] At least one memory can store various data (e.g., reference voltage data) required to control the light-emitting element (111).

[0187] The control unit (150) may include at least one configuration for controlling the light-emitting element (111). For example, the control unit (150) may include an image processing unit (90), a dimming driver (170), and / or a driving element (300).

[0188] The control unit (150) can control the light-emitting element (111) based on image data.

[0189] Controlling the light-emitting element (111) based on image data may include generating dimming data based on image data and controlling the light-emitting element (111) based on dimming data.

[0190] As explained above, video frame data may refer to either the frame data included in the video data or the frame data included in the dimming data.

[0191] Controlling the light-emitting element (111) based on image data may include controlling the light-emitting element (111) based on image frame data.

[0192] Controlling the light-emitting element (111) based on video frame data may include applying a driving current having a target amplitude corresponding to a color value included in the video frame data to the light-emitting element (111) for a target application time corresponding to a color value included in the video frame data.

[0193] The target amplitude and target application time corresponding to the color value can be stored in advance in the memory of the control unit (150). The target amplitude and target application time corresponding to the color value can be referred to as PAM (Pulse Amplitude Modulation) control value and PWM (Pulse Width Modulation) control value, respectively. The target amplitude may be referred to as target size, target intensity, etc., and the target application time may be referred to as target driving time, target on time, etc.

[0194] The image data may include image frame data corresponding to a plurality of consecutive image frames. For example, the image data may include first image frame data corresponding to a first image frame and second image frame data corresponding to a second image frame following the first image frame.

[0195] The second video frame after the first video frame may mean a frame immediately after the first video frame, or it may mean a frame after a predetermined number of video frames based on the first video frame.

[0196] The first and second video frame data may also be referred to as the first and second dimming data, respectively.

[0197] The control unit (150) can receive a feedback voltage detected at the cathode of the light-emitting element (111). For example, the control unit (150) can receive a feedback voltage (VFR) detected at the cathode of the red light-emitting diode (190R). The control unit (150) can receive a feedback voltage (VFG) detected at the cathode of the green light-emitting diode (190G). The control unit (150) can receive a feedback voltage (VFB) detected at the cathode of the blue light-emitting diode (190B).

[0198] The control unit (150) may include a sensing circuit for receiving a feedback voltage detected at the cathode of the light-emitting element (111).

[0199] Receiving a feedback voltage detected at the cathode of the light-emitting element (111) by the control unit (150) may include receiving information regarding the magnitude of the feedback voltage detected at the cathode of the light-emitting element (111).

[0200] The control unit (150) can control the driving voltage (VLED) applied to the anode of the light-emitting element (111). The control unit (150) can control the driving voltage (VLED) applied to the anode of the light-emitting element (111) based on image data. For example, the control unit (150) can increase the driving voltage (VLED) when the light-emitting element (111) needs to emit light of high brightness compared to when it needs to emit light of low brightness.

[0201] In FIG. 9, the anodes of the red light-emitting diode (190R), the green light-emitting diode (190G), and the blue light-emitting diode (190B) are each shown to be receiving the same driving voltage (VLED), but according to one or more embodiments, the anodes of the red light-emitting diode (190R), the green light-emitting diode (190G), and the blue light-emitting diode (190B) may each be receiving different driving voltages.

[0202] The control unit (150) can control the driving current flowing through the light-emitting element (111).

[0203] The control unit (150) can operate in a sinking manner to regulate the cathode-side current while the driving voltage is applied to the anode of the light-emitting element (111). For example, a Digital-to-Analog Converter (DAC) that converts a digital control signal into an analog current may be built into the interior of the driving element (300), which is a component of the control unit (150), and the driving current flowing through the light-emitting element (111) can be controlled in such a way that the DAC supplies the necessary analog current to the light-emitting element (111) according to the digital input signal.

[0204] In one or more embodiments, the control unit (150) can control the driving current flowing through the light-emitting element (111) using PWM (Pulse Width Modulation) control and / or PAM (Pulse Amplitude Modulation) control.

[0205] The control unit (150) can control the driving current applied to the light-emitting element (111) based on video frame data.

[0206] For example, the control unit (150) can control the driving current (190RI) applied to the red light-emitting diode (190R) based on video frame data. The control unit (150) can control the driving current (190GI) applied to the green light-emitting diode (190G) based on video frame data. The control unit (150) can control the driving current (190BI) applied to the blue light-emitting diode (190B) based on video frame data.

[0207] In one or more embodiments, the control unit (150) can control the driving current applied to the light-emitting element (111) based on the first image frame data in the first image frame.

[0208] The first image frame data may refer to image data corresponding to the first image frame.

[0209] In one or more embodiments, the control unit (150) can control the driving current applied to the light-emitting element (111) based on the second image frame data in the second image frame after the first image frame.

[0210] The second image frame data may refer to image data corresponding to the second image frame.

[0211] FIG. 10 is a flowchart illustrating an example of a control method for a display device according to one or more embodiments.

[0212] Referring to FIG. 10, the control unit (150) can receive video frame data (1100).

[0213] According to one or more embodiments, receiving video frame data may include decoding a video signal received from a content receiving unit (80) into video data.

[0214] According to one or more embodiments, receiving video frame data may include generating dimming data from the video data.

[0215] The flowchart illustrated in FIG. 10 illustrates operations that can be performed by the control unit (150) in each video frame.

[0216] The control unit (150) can correct the driving current calculated based on the video frame data corresponding to the current video frame based on the result of comparing the feedback voltage and the reference voltage in the previous video frame (1150).

[0217] The control unit (150) can control the driving current applied to the light-emitting element (111) based on the driving current corrected by the operation 1150 (1200).

[0218] The control unit (150) can compare the feedback voltage received in the current video frame with the reference voltage (1300), and can correct the driving current in the next video frame based on the result of comparing the feedback voltage in the current video frame with the reference voltage (1150).

[0219] In the first image frame, the control unit (150) receives first image frame data corresponding to the first image frame and can perform operations 1150, 1200, and 1300.

[0220] In the second image frame, the control unit (150) receives second image frame data corresponding to the second image frame and can perform operations 1150, 1200 and 1300.

[0221] The control unit (150) can control the driving current applied to the light-emitting element (111) based on the first image frame data corresponding to the first image frame in the first image frame.

[0222] Controlling the driving current applied to the light-emitting element (111) based on the first image frame data may include controlling the driving current applied to the light-emitting element (111) based on the result of comparing the first image frame data with the feedback voltage and reference voltage in the previous image frame of the first image frame.

[0223] The control unit (150) can receive a feedback voltage detected at the cathode of the light-emitting element (111) in the first image frame.

[0224] The control unit (150) can control the driving current in the second image frame after the first image frame based on the second image frame data corresponding to the second image frame and the voltage difference between the feedback voltage received in the first image frame and the reference voltage corresponding to the first image frame data.

[0225] The control unit (150) can receive a feedback voltage detected at the cathode of the light-emitting element (111) in the second image frame.

[0226] The control unit (150) can control the driving current in the third image frame after the second image frame based on the third image frame data corresponding to the third image frame and the voltage difference between the feedback voltage received in the second image frame and the reference voltage corresponding to the second image frame data.

[0227] The control unit (150) can control the brightness of the light-emitting element (111) by repeating the operation shown in FIG. 10 in this manner and taking into account the degree of degradation of the light-emitting element (111) in consecutive video frames.

[0228] A method for controlling the driving current based on the current video frame data corresponding to the current video frame, the voltage difference between the feedback voltage received from the previous frame and the reference voltage corresponding to the previous frame data, will be explained in detail later.

[0229] In one or more embodiments, the control unit (150) can correct the driving current by correcting the current image frame data corresponding to the current image frame based on the voltage difference between the feedback voltage received in the previous frame and the reference voltage corresponding to the previous frame data.

[0230] In one or more embodiments, the control unit (150) can correct the driving current by adding an RGB color value corresponding to the voltage difference between the feedback voltage received in the previous frame and the reference voltage corresponding to the previous frame data to the RGB color value based on the current image frame data corresponding to the current image frame.

[0231] When the light-emitting element (111) includes a red light-emitting diode (190R), a green light-emitting diode (190G), and a blue light-emitting diode (190B), even if the red light-emitting diode (190R), the green light-emitting diode (190G), and the blue light-emitting diode (190B) are controlled based on the same image frame data, the driving current (190RI) of the red light-emitting diode (190R), the driving current (190GI) of the green light-emitting diode (190G), and the driving current (190BI) of the blue light-emitting diode (190B) may be different from each other.

[0232] For example, even if video frame data contains the same R, G, and B values, the driving currents (190RI, 190GI, 190BI) for emitting light of the same luminance value from the red light-emitting diode (190R), green light-emitting diode (190G), and blue light-emitting diode (190B) may be different from each other.

[0233] For example, a red light-emitting diode (190R) may require a driving current of 3mA during the frame period to emit red light corresponding to a luminance value of 100, while a blue light-emitting diode (190B) may require a driving current of 2.5mA during the frame period to emit blue light corresponding to a luminance value of 100, and a green light-emitting diode (190G) may require a driving current of 2mA during the frame period to emit green light corresponding to a luminance value of 100.

[0234] As another example, video frame data may contain the same R, G, and B values, and accordingly, the driving currents for emitting light of the same luminance value from the red light-emitting diode (190R), green light-emitting diode (190G), and blue light-emitting diode (190B) may be different from each other.

[0235] That is, the control unit (150) can control the driving current applied to the red light-emitting diode (190R) based on the R value included in the video frame data, control the driving current applied to the green light-emitting diode (190G) based on the G value included in the video frame data, and control the driving current applied to the blue light-emitting diode (190B) based on the B value included in the video frame data.

[0236] When the control unit (150) controls the driving current applied to the light-emitting element (111) based on video frame data, the voltage applied to the light-emitting element (111) (potential difference between the two ends of the light-emitting element (111)) can be checked based on information stored in memory.

[0237] For example, if the R value included in the video frame data is 100, the voltage applied to the un-degraded normal state red light-emitting diode (190R) may be 5V.

[0238] If the voltage applied to a normal red light-emitting diode (190R) that is not degraded is 5V, and three red light-emitting diodes (190R) are connected in series and the driving voltage applied to the anode of the red light-emitting diode (190R) is 20V, then when the red light-emitting diode (190R) is in a normal state, a voltage of 5V must remain at the cathode of the red light-emitting diode (190R).

[0239] As another example, when the G value included in the video frame data is 100, the voltage applied to the green light-emitting diode (190G) in a normal state without degradation may be 4.8V.

[0240] If the voltage applied to a green light-emitting diode (190G) in a normal state that is not degraded is 4.8V, and three green light-emitting diodes (190G) are connected in series and the driving voltage applied to the anode of the green light-emitting diode (190G) is 20V, then when the green light-emitting diode (190G) is in a normal state, a voltage of 5.6V must remain at the cathode of the green light-emitting diode (190G).

[0241] As another example, if the B value included in the video frame data is 100, the voltage applied to the un-degraded normal state blue light-emitting diode (190B) may be 4.8V.

[0242] The reference voltage described above can be predefined as the voltage that must remain at the cathode of the light-emitting diode based on the case where the light-emitting diode is in a normal state.

[0243] As the light-emitting diode (190R, 190G, 190B) deteriorates, even if the same driving current is applied to the light-emitting diode (190R, 190G, 190B), a smaller voltage is applied across the terminals of the light-emitting diode (190R, 190G, 190B).

[0244] That is, when the light-emitting diodes (190R, 190G, 190B) degrade, the feedback voltage becomes higher than the reference voltage.

[0245] Meanwhile, if the driving voltage (VLED) is insufficient due to various reasons, the feedback voltage becomes lower than the reference voltage.

[0246] In other words, if the driving voltage (VLED) is insufficient, the feedback voltage becomes lower than the reference voltage.

[0247] FIG. 11 is a diagram illustrating a reference voltage that changes according to the type of light-emitting diode and RGB color value according to one or more embodiments.

[0248] Referring to FIG. 11, the memory included in the control unit (150) can store a lookup table in which a color value (or luminance value) and a reference voltage are matched according to the type of light-emitting diode (190R, 190G, 190B).

[0249] For example, for the red light-emitting diode (190R), green light-emitting diode (190G) and blue light-emitting diode (190B), the reference voltage corresponding to color value 0 may be defined as R0, G0, and B0, respectively.

[0250] Likewise, for the red light-emitting diode (190R), green light-emitting diode (190G) and blue light-emitting diode (190B), the reference voltages corresponding to color values ​​1, 100, 101, 255 may be defined as R1, G1, B1 / R100, G100, B100 / R101, G101, B101 / R255, G255, B255, respectively.

[0251] The reference voltage associated with each of the red light-emitting diode (190R), green light-emitting diode (190G), and blue light-emitting diode (190B) corresponding to the same color value may differ depending on the type of light-emitting diode. For example, R100, G100, and B100 may differ from each other.

[0252] In one or more embodiments, the reference voltage corresponding to the image frame data may mean a reference voltage corresponding to the color value of the image frame data.

[0253] For example, a reference voltage corresponding to video frame data may include a first reference voltage corresponding to the R value of the video frame data, a second reference voltage corresponding to the G value of the video frame data, and a third reference voltage corresponding to the B value of the video frame data.

[0254] Depending on the material characteristics of the light-emitting diode, even if the R value, G value, and B value are all the same, at least some of the first reference voltage, second reference voltage, and third reference voltage may be different.

[0255] For example, if the magnitude of the R value and the magnitude of the B value are the same, the magnitude of the first reference voltage and the magnitude of the third reference voltage may be different. For example, if the magnitude of the R value and the magnitude of the B value are the same, the magnitude of the first reference voltage may be greater than the magnitude of the third reference voltage.

[0256] As another example, when the magnitude of the R value and the magnitude of the G value are the same, the magnitude of the first reference voltage and the magnitude of the second reference voltage may be different. For instance, when the magnitude of the R value and the magnitude of the G value are the same, the magnitude of the second reference voltage may be greater than the magnitude of the first reference voltage.

[0257] As another example, when the magnitudes of the G and B values ​​are the same, the magnitudes of the second reference voltage and the third reference voltage may differ. For instance, when the magnitudes of the G and B values ​​are the same, the magnitude of the second reference voltage may be greater than the magnitude of the third reference voltage.

[0258] According to the present invention, a display device (10) and a control method of the display device (10) are provided, which can compensate for the degree of degradation by accurately reflecting the degree of degradation of each of the red light-emitting diode (190R), green light-emitting diode (190G), and blue light-emitting diode (190B) by determining the degradation characteristics of each of the red light-emitting diode (190R), green light-emitting diode (190G), and blue light-emitting diode (190B) and predefining different reference voltages for the same color value for each of the red light-emitting diode (190R), green light-emitting diode (190G), and blue light-emitting diode (190B).

[0259] In the present invention, 'reference voltage corresponding to image frame data' may mean a reference voltage corresponding to a color value. For example, the reference voltage corresponding to image frame data may mean a first reference voltage of a red light-emitting diode (190R) corresponding to an R value included in the image frame data, a second reference voltage of a green light-emitting diode (190G) corresponding to a G value included in the image frame data, and a third reference voltage of a blue light-emitting diode (190B) corresponding to a B value included in the image frame data.

[0260] For convenience of explanation, it is assumed that the control unit (150) controls the light-emitting element (111) in the second image frame after the first image frame.

[0261] FIG. 12 illustrates the appearance of light-emitting diodes according to one or more embodiments when they are not degraded.

[0262] Referring to FIG. 12, the control unit (150) can determine the voltage difference between the feedback voltage (VFR, VFG, VFB) detected in the first image frame and the reference voltage (VSR, VSG, VSB) corresponding to the first image frame data.

[0263] Since the reference voltage is defined based on the case where the light-emitting element (111) is in a normal state, it is presumed that the light-emitting element (111) has not deteriorated when the feedback voltage detected in the first image frame and the reference voltage corresponding to the first image frame data are the same.

[0264] In the present invention, the feedback voltage and the reference voltage being the same may include the voltage difference between the feedback voltage and the reference voltage being within a predetermined range (e.g., 0.1V).

[0265] The control unit (150) can apply a driving current having a target amplitude corresponding to a color value included in the second image frame data to the light-emitting element (111) for a target application time corresponding to a color value included in the second image frame data, based on the fact that the feedback voltage detected in the first image frame and the reference voltage corresponding to the first image frame data are the same.

[0266] In one or more embodiments, the control unit (150) may control the driving current by performing only PAM control when there is no need to correct the driving current. For example, when there is no need to correct the driving current, the control unit (150) may apply a driving current having a target amplitude corresponding to the color value included in the image frame data corresponding to the image frame throughout the entire section of the image frame.

[0267] That is, the control unit (150) may not correct the second image frame data based on the fact that the feedback voltage detected in the first image frame and the reference voltage corresponding to the first image frame data are the same.

[0268] For example, the control unit (150) can apply a driving current having a target amplitude corresponding to the R value included in the second image frame data to the red light-emitting diode (190R) for a target application time corresponding to the R value included in the second image frame data, based on the fact that the feedback voltage (VFR) detected at the cathode of the red light-emitting diode (190R) in the first image frame and the reference voltage (VSR) of the red light-emitting diode (190R) corresponding to the first image frame data are the same. The control unit (150) can apply a driving current having a target amplitude corresponding to the G value included in the second image frame data to the green light-emitting diode (190G) for a target application time corresponding to the G value included in the second image frame data, based on the fact that the feedback voltage (VFG) detected at the cathode of the green light-emitting diode (190G) in the first image frame and the reference voltage (VSG) of the green light-emitting diode (190G) corresponding to the first image frame data are the same. The control unit (150) can apply a driving current having a target amplitude corresponding to a B value included in the second image frame data to the blue light-emitting diode (190B) for a target application time corresponding to a B value included in the second image frame data, based on the fact that the feedback voltage (VFB) detected at the cathode of the blue light-emitting diode (190B) in the first image frame and the reference voltage (VSB) of the blue light-emitting diode (190B) corresponding to the first image frame data are the same.

[0269] FIG. 13 illustrates the deterioration of some of the light-emitting diodes among the light-emitting diodes according to one or more embodiments.

[0270] Referring to FIG. 13, the control unit (150) can determine the voltage difference between the feedback voltage (VFR, VFG, VFB) detected in the first image frame and the reference voltage (VSR, VSG, VSB) corresponding to the first image frame data.

[0271] Since the reference voltage is defined based on the case where the light-emitting element (111) is in a normal state, if the feedback voltage detected in the first video frame is greater than the reference voltage corresponding to the first video frame data, it is presumed that the light-emitting element (111) has deteriorated.

[0272] In the present invention, the feedback voltage being greater than the reference voltage may include the feedback voltage being greater than a predetermined voltage (e.g., 0.1V) than the reference voltage.

[0273] The control unit (150) can apply a driving current to a light-emitting element (111) having a target amplitude (hereinafter 'second amplitude') greater than the target amplitude (hereinafter 'first amplitude') corresponding to the color value included in the second image frame data, based on the fact that the feedback voltage detected in the first image frame is greater than the reference voltage corresponding to the first image frame data.

[0274] That is, the control unit (150) can correct the second image frame data based on the fact that the feedback voltage detected in the first image frame is greater than the reference voltage corresponding to the first image frame data.

[0275] The greater the difference between the feedback voltage and the reference voltage, the more severe the degradation of the light-emitting element (111).

[0276] The control unit (150) can determine a second amplitude based on the voltage difference between the feedback voltage and the reference voltage.

[0277] For example, the control unit (150) can determine the second amplitude to be larger as the voltage difference between the feedback voltage and the reference voltage increases.

[0278] The control unit (150) can apply a driving current to the red light-emitting diode (190R) having a second amplitude greater than the first amplitude corresponding to the R value included in the second image frame data, based on the fact that the feedback voltage (VFR) detected at the cathode of the red light-emitting diode (190R) in the first image frame is greater than the reference voltage (VSR) of the red light-emitting diode (190R) corresponding to the first image frame data. The control unit (150) can apply a driving current to the green light-emitting diode (190G) having a second amplitude greater than the first amplitude corresponding to the G value included in the second image frame data, based on the fact that the feedback voltage (VFG) detected at the cathode of the green light-emitting diode (190G) in the first image frame is greater than the reference voltage (VSG) of the green light-emitting diode (190G) corresponding to the first image frame data. The control unit (150) can apply a driving current to the blue light-emitting diode (190B) having a second amplitude greater than a first amplitude corresponding to a B value included in the second image frame data, based on the fact that the feedback voltage (VFB) detected at the cathode of the blue light-emitting diode (190B) in the first image frame is greater than the reference voltage (VSB) of the blue light-emitting diode (190B) corresponding to the first image frame data.

[0279] If the light-emitting element (111) is degraded, applying a larger driving current to the light-emitting element (111) will correct the brightness, but the degree of degradation of the light-emitting element (111) may become more severe. As the degree of degradation of the light-emitting element (111) becomes more severe, a larger driving current is applied to the light-emitting element (111) in the next video frame as well, and if the light-emitting element (111) degrades further as a result, a vicious cycle of increased driving current and degradation of the light-emitting element (111) may occur.

[0280] FIG. 14 illustrates an example of a driving current applied to a light-emitting diode based on the same color value when the light-emitting diode is degraded and when it is not degraded, according to one or more embodiments.

[0281] Referring to FIG. 14, the control unit (150) can adjust the amplitude and application time of the driving current applied to the light-emitting element (111) through PWM control and PAM control in the image frame.

[0282] In one or more embodiments, the control unit (150) applies a driving current to a light-emitting element (111) having a second amplitude greater than a first amplitude corresponding to a color value included in the second image frame data, based on the fact that the feedback voltage detected in the first image frame is greater than the reference voltage corresponding to the first image frame data, and the application time of the driving current having the second amplitude may be reduced.

[0283] In one or more embodiments, the control unit (150) can apply a driving current having a second amplitude (p2) to the light-emitting element (111) for a target time (hereinafter 'second application time (d2)') shorter than the target application time (hereinafter 'first application time (d1)') corresponding to the color value included in the second image frame data.

[0284] That is, the control unit (150) can apply a driving current having a second amplitude (p2) that is greater than a first amplitude (p1) that corresponds to a color value included in the second image frame data to the light-emitting element (111) for a second application time (d2) that is shorter than a first application time (d1) that corresponds to a color value included in the second image frame data, based on the fact that the feedback voltage detected in the first image frame is greater than a reference voltage corresponding to the first image frame data.

[0285] However, the product (TA1) of the first amplitude (p1) and the first application time (d1) may be smaller than the product (TA2) of the second amplitude (p2) and the second application time (d2).

[0286] That is, the control unit (150) can determine the second amplitude (p2) and the second application time (d2) such that the product (TA2) of the second amplitude (p2) and the second application time (d2) is greater than the product (TA1) of the first amplitude (p1) and the first application time (d1).

[0287] When a driving current is applied to a light-emitting element (111) for a second application time (d2) that is shorter than a first application time (d1), a period occurs during which the light-emitting element (111) does not emit light during the difference (d2-d1) between the second application time (d2) and the first application time (d1).

[0288] According to the present invention, a time during which the light-emitting element (111) does not emit light within the corresponding video frame can be secured, thereby preventing the degree of degradation of the light-emitting element (111).

[0289] That is, according to the present invention, a sufficient amount of time can be secured to compensate for the decrease in brightness due to the degradation of the light-emitting element (111) and at the same time recover the degradation of the light-emitting element (111).

[0290] FIG. 15 illustrates a case where the driving voltage applied to light-emitting diodes according to one or more embodiments is insufficient.

[0291] Referring to FIG. 15, the control unit (150) can determine the voltage difference between the feedback voltage (VFR, VFG, VFB) detected in the first image frame and the reference voltage (VSR, VSG, VSB) corresponding to the first image frame data.

[0292] Since the reference voltage is defined based on the case where the light-emitting element (111) is in a normal state, if the feedback voltage detected in the first image frame is smaller than the reference voltage corresponding to the first image frame data, it is estimated that the driving voltage (VLED) is insufficient.

[0293] In the present invention, the feedback voltage being smaller than the reference voltage may include the feedback voltage being less than or equal to a predetermined voltage (e.g., 0.1V) than the reference voltage.

[0294] The control unit (150) can increase the driving voltage applied to the anode of the light-emitting element (111) based on the fact that the feedback voltage detected in the first image frame is smaller than the reference voltage corresponding to the first image frame data.

[0295] When the anodes of the red light-emitting diode (190R), green light-emitting diode (190G) and blue light-emitting diode (190B) are all connected to the same node and receive a driving voltage, the control unit (150) can increase the driving voltage (VLED) based on the fact that the feedback voltage (VFR) detected at the cathode of the red light-emitting diode (190R) in the first image frame is smaller than the reference voltage (VSR) of the red light-emitting diode (190R) corresponding to the first image frame data, the feedback voltage (VFG) detected at the cathode of the green light-emitting diode (190G) in the first image frame is smaller than the reference voltage (VSG) of the green light-emitting diode (190G) corresponding to the first image frame data, or the feedback voltage (VFB) detected at the cathode of the blue light-emitting diode (190B) in the first image frame is smaller than the reference voltage (VSB) of the blue light-emitting diode (190B) corresponding to the first image frame data.

[0296] When the anodes of the red light-emitting diode (190R), green light-emitting diode (190G), and blue light-emitting diode (190B) are all connected to different nodes and receive driving voltages independently, the control unit (150) increases the driving voltage applied to the anode of the red light-emitting diode (190R) based on the fact that the feedback voltage (VFR) detected at the cathode of the red light-emitting diode (190R) in the first image frame is smaller than the reference voltage (VSR) of the red light-emitting diode (190R) corresponding to the first image frame data, increases the driving voltage applied to the anode of the green light-emitting diode (190G) based on the fact that the feedback voltage (VFG) detected at the cathode of the green light-emitting diode (190G) in the first image frame is smaller than the reference voltage (VSG) of the green light-emitting diode (190G) corresponding to the first image frame data, and increases the driving voltage applied to the anode of the green light-emitting diode (190G) based on the fact that the feedback voltage (VFB) detected at the cathode of the blue light-emitting diode (190B) in the first image frame corresponds to the first image frame data The driving voltage (VLED) applied to the anode of the blue light-emitting diode (190B) can be increased based on being smaller than the reference voltage (VSB) of the blue light-emitting diode (190B).

[0297] According to the present invention, if the driving voltage is not properly applied for various reasons, the decrease in brightness of the light-emitting element (111) can be prevented by increasing the driving voltage.

[0298] A display device (10) according to one or more embodiments of the present disclosure may include: a light-emitting element (111); and a control unit (150) that controls a driving current applied to the light-emitting element (111) based on first image frame data corresponding to the first image frame in a first image frame, receives a feedback voltage detected at the cathode of the light-emitting element (111) in the first image frame, and controls a driving current based on second image frame data corresponding to the second image frame and a voltage difference between the feedback voltage and a reference voltage corresponding to the first image frame data in a second image frame after the first image frame.

[0299] In the second image frame, the control unit (150) can apply a driving current to the light-emitting element (111) having a second amplitude greater than the first amplitude corresponding to the second image frame data, based on the fact that the feedback voltage is greater than the reference voltage.

[0300] The control unit (150) can determine a second amplitude based on the voltage difference.

[0301] In the second image frame, the control unit (150) can apply a driving current to the light-emitting element (111) for a second application time shorter than the first application time corresponding to the second image frame data, based on the fact that the feedback voltage is greater than the reference voltage.

[0302] The control unit (150) can determine the second amplitude and the second application time such that the product of the second amplitude and the second application time is greater than the product of the first amplitude and the first application time.

[0303] In the second video frame, the control unit (150) can apply a driving current having a first amplitude to the light-emitting element (111) for a first application time based on the fact that the feedback voltage and the reference voltage are the same.

[0304] In the second video frame, the control unit (150) can increase the driving voltage applied to the anode of the light-emitting element (111) based on the fact that the feedback voltage is smaller than the reference voltage.

[0305] The light-emitting element (111) may include a red light-emitting diode (190R) that outputs red light, a green light-emitting diode (190G) that outputs green light, and a blue light-emitting diode (190B) that outputs blue light.

[0306] The first video frame data may include an R value, which is the color value of a red light-emitting diode (190R), a G value, which is the color value of a green light-emitting diode (190G), and a B value, which is the color value of a blue light-emitting diode (190B).

[0307] A reference voltage corresponding to the first image frame data may include a first reference voltage corresponding to the R value of the first image frame data, a second reference voltage corresponding to the G value of the first image frame data, and a third reference voltage corresponding to the B value of the first image frame data.

[0308] When the magnitude of the R value and the magnitude of the B value are the same, the magnitude of the first reference voltage may be greater than the magnitude of the third reference voltage.

[0309] When the magnitude of the R value and the magnitude of the G value are the same, the magnitude of the second reference voltage may be greater than the magnitude of the first reference voltage.

[0310] When the magnitude of the G value and the magnitude of the B value are the same, the magnitude of the second reference voltage may be greater than the magnitude of the third reference voltage.

[0311] A control method for a display device (10) according to one or more embodiments of the present disclosure may include: controlling a driving current applied to a light-emitting element (111) based on first image frame data corresponding to the first image frame in a first image frame; receiving a feedback voltage detected at the cathode of the light-emitting element (111) in the first image frame; and controlling a driving current based on second image frame data corresponding to the second image frame and a voltage difference between the feedback voltage and a reference voltage corresponding to the first image frame data in a second image frame after the first image frame.

[0312] Controlling the driving current based on the second image frame data and the voltage difference may include applying a driving current to the light-emitting element (111) having a second amplitude greater than the first amplitude corresponding to the second image frame data based on the fact that the feedback voltage is greater than the reference voltage.

[0313] The control method of the display device (10) may further include determining a second amplitude based on a voltage difference.

[0314] Controlling the driving current based on the second image frame data and the voltage difference may further include applying the driving current to the light-emitting element (111) for a second application time shorter than the first application time corresponding to the second image frame data based on the fact that the feedback voltage is greater than the reference voltage.

[0315] The control method of the display device (10) may further include determining the second amplitude and the second application time such that the product of the second amplitude and the second application time becomes greater than the product of the first amplitude and the first application time.

[0316] Controlling the driving current based on the second image frame data and voltage difference may further include applying a driving current having a first amplitude to the light-emitting element (111) for a first application time based on the fact that the feedback voltage and the reference voltage are the same.

[0317] The control method of the display device (10) may further include increasing the driving voltage applied to the anode of the light-emitting element (111) based on the fact that, in the second image frame, the feedback voltage is smaller than the reference voltage.

[0318] Meanwhile, the disclosed embodiments may be implemented in the form of a recording medium that stores instructions executable by a computer. The instructions may be stored in the form of program code and, when executed by a processor, may generate a program module to perform the operation of the disclosed embodiments. The recording medium may be implemented as a computer-readable recording medium.

[0319] Computer-readable recording media include all types of recording media that store instructions that can be decoded by a computer. Examples include ROM (read-only memory), RAM (random access memory), magnetic tape, magnetic disk, flash memory, optical data storage devices, etc.

[0320] Additionally, computer-readable recording media may be provided in the form of non-transitory storage media. Here, 'non-transitory storage media' simply means that it is a tangible device and does not contain a signal (e.g., electromagnetic waves), and this term does not distinguish between cases where data is stored semi-permanently and cases where it is stored temporarily. For example, 'non-transitory storage media' may include a buffer in which data is stored temporarily.

[0321] According to one or more embodiments, the method according to one or more embodiments disclosed herein may be provided as included in a computer program product. The computer program product may be traded between a seller and a buyer as a product. The computer program product may be distributed in the form of a device-readable recording medium (e.g., compact disc read-only memory (CD-ROM)), or distributed online (e.g., download or upload) through an application store (e.g., Play Store™) or directly between two user devices (e.g., smartphones). In the case of online distribution, at least a portion of the computer program product (e.g., downloadable app) may be temporarily stored or temporarily created on a device-readable recording medium, such as the memory of a manufacturer's server, an application store's server, or a relay server.

[0322] As described above, the disclosed embodiments have been explained with reference to the attached drawings. Those skilled in the art will understand that the present invention may be practiced in forms different from the disclosed embodiments without changing the technical spirit or essential features of the invention. The disclosed embodiments are illustrative and should not be interpreted restrictively.

Claims

1. Light-emitting element; and In the first image frame, the driving current applied to the light-emitting element is controlled based on the first image frame data corresponding to the first image frame, and In the first image frame above, a feedback voltage detected at the cathode of the light-emitting element is received, and A display device comprising: a control unit that controls the driving current based on the second image frame data corresponding to the second image frame and the voltage difference between the feedback voltage and the reference voltage corresponding to the first image frame data in a second image frame after the first image frame.

2. In Paragraph 1, In the second image frame above, the control unit, A display device that, based on the fact that the feedback voltage is greater than the reference voltage, the driving current has a second amplitude greater than the first amplitude corresponding to the second image frame data.

3. In Paragraph 2, The above control unit is, A display device that determines the second amplitude based on the above voltage difference.

4. In Paragraph 2, In the second image frame above, the control unit, A display device that applies the driving current to the light-emitting element for a second application time shorter than the first application time corresponding to the second image frame data, based on the fact that the feedback voltage is greater than the reference voltage.

5. In Paragraph 4, A display device in which the product of the second amplitude and the second application time is greater than the product of the first amplitude and the first application time.

6. In Paragraph 4, In the second image frame above, the control unit, A display device that causes the driving current to have the first amplitude during the first application time based on the fact that the feedback voltage and the reference voltage are the same.

7. In Paragraph 1, In the second image frame above, the control unit, A display device that increases the driving voltage applied to the anode of the light-emitting element based on the fact that the feedback voltage is smaller than the reference voltage.

8. In Paragraph 1, The above light-emitting element is, It includes a red light-emitting diode that outputs red light, a green light-emitting diode that outputs green light, and a blue light-emitting diode that outputs blue light, and The above first image frame data is, It includes the R value, which is the color value of the red light-emitting diode, the G value, which is the color value of the green light-emitting diode, and the B value, which is the color value of the blue light-emitting diode. The reference voltage corresponding to the first image frame data is, A display device comprising a first reference voltage corresponding to the R value, a second reference voltage corresponding to the G value, and a third reference voltage corresponding to the B value.

9. In Paragraph 8, A display device in which the magnitude of the R value and the magnitude of the B value are the same, and the magnitude of the first reference voltage is greater than the magnitude of the third reference voltage.

10. In Paragraph 8, A display device in which, when the magnitude of the R value and the magnitude of the G value are the same, the magnitude of the second reference voltage is greater than the magnitude of the first reference voltage.

11. A method for controlling a display device, In a first image frame, a driving current applied to a light-emitting element of the display device is controlled based on first image frame data corresponding to the first image frame, and In the first image frame above, a feedback voltage detected at the cathode of the light-emitting element is received; A control method for a display device comprising: controlling the driving current based on the second image frame data corresponding to the second image frame and the voltage difference between the feedback voltage and the reference voltage corresponding to the first image frame data in a second image frame after the first image frame.

12. In Paragraph 11, Controlling the driving current based on the second image frame data and the voltage difference is, A control method for a display device comprising: making the driving current have a second amplitude greater than the first amplitude corresponding to the second image frame data based on the fact that the feedback voltage is greater than the reference voltage.

13. In Paragraph 12, A control method for a display device further comprising determining the second amplitude based on the above voltage difference.

14. In Paragraph 12, Controlling the driving current based on the second image frame data and the voltage difference is, A control method for a display device further comprising: applying the driving current to the light-emitting element for a second application time shorter than the first application time corresponding to the second image frame data, based on the fact that the feedback voltage is greater than the reference voltage.

15. In Paragraph 14, A control method for a display device, wherein the product of the second amplitude and the second application time is greater than the product of the first amplitude and the first application time.

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