Display apparatus and method for controlling same

Abstract

A display apparatus according to the present disclosure comprises an image display unit, a backlight unit, and at least one processor. The backlight unit comprises: a substrate; and a plurality of dimming blocks arranged in a plurality of rows and a plurality of columns on the substrate, wherein each of the dimming blocks includes a red LED, a green LED, and a blue LED. In a color vision deficiency mode, the at least one processor may: acquire, on the basis of image data, color difference values between a plurality of image blocks of an image corresponding to the plurality of dimming blocks; determine, on the basis of the color difference values between the plurality of image blocks, at least one of a current weight for a red LED of one dimming block among the plurality of dimming blocks, a current weight for a green LED of the dimming block, and a current weight for a blue LED of the dimming block; and control, on the basis of the image data and the determined current weight, current supplied to at least one of the red LED of the dimming block, the green LED of the dimming block, and the blue LED of the dimming block.

Description

Display device and control method of the display device

[0001] Some embodiments of the present disclosure relate to a display device and a method for controlling a display device.

[0002] 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) configured to irradiate light toward 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] A display device, for example, QLED (Quantum-dot Light Emitting Diode), uses a blue LED (Light Emitting Diode) as a backlight unit and implements RGB colors through a quantum dot sheet and a color filter.

[0005] For individuals with color blindness, there are cases where they cannot clearly distinguish images displayed on the device due to their condition, even if the display device reproduces color images close to actual colors. The color blindness filter function adjusts specific colors to be stronger, allowing those individuals to perceive those colors more easily.

[0006] To implement the color blindness filter function, the current of the blue LED is first increased to generate stronger light. This strong blue light is converted into red and green light through a quantum dot sheet. This increases the intensity of colors that colorblind individuals need to perceive and improves color contrast on the screen. Additionally, specific colors are made more distinct through the adjustment of color filters and the liquid crystal layer. The transmittance of the liquid crystal is adjusted to allow more red or green light to pass through, thereby enhancing color accuracy. These adjustments contribute to enabling colorblind individuals to perceive the corresponding colors more easily.

[0007] However, this method has limitations. For example, to express red more strongly, the current of the blue LED was increased to make the red light more intense. In this process, as the output of the blue LED increased, unwanted blue and green light also became brighter, resulting in lower luminous efficiency and unnecessary power consumption.

[0008] According to some embodiments of the present disclosure, a display device and a method for controlling the display device are provided, which can more effectively implement a color blindness filter function by controlling the current of each LED in a display device using RGB LEDs as a light source.

[0009] One aspect of the embodiments of the present disclosure is not limited to the aspect mentioned above, and other unmentioned aspects will be clearly understood by those skilled in the art from the description below.

[0010] According to some embodiments of the present disclosure, a display device comprises: an image display unit; a backlight unit that provides light to the image display unit; and at least one processor configured to enable the display device to display an image by controlling the image display unit and the backlight unit; wherein the backlight unit comprises: a substrate; and a plurality of dimming blocks arranged in a plurality of rows and a plurality of columns on the substrate, each comprising a red LED, a green LED, and a blue LED; and in a color blind mode, the at least one processor obtains a color difference value between a plurality of image blocks of the image corresponding to the plurality of dimming blocks based on image data, and determines at least one of a current weight of a red LED of one of the plurality of dimming blocks, a current weight of a green LED of the dimming block, and a current weight of a blue LED of the dimming block based on the color difference value between the plurality of image blocks, and can control a current supplied to at least one of a red LED of the dimming block, a green LED of the dimming block, and a blue LED of the dimming block based on the image data and the determined current weight.

[0011] According to some embodiments of the present disclosure, a control method for a display device may include: a step of obtaining a color difference value between a plurality of image blocks of an image based on image data in a color blindness mode, wherein the plurality of image blocks correspond to a plurality of dimming blocks of the display device; a step of determining at least one of a current weight of a red LED of one of the plurality of dimming blocks, a current weight of a green LED of the dimming block, and a current weight of a blue LED of the dimming block based on the color difference value between the plurality of image blocks; and a step of controlling a current supplied to at least one of the red LED of the dimming block, the green LED of the dimming block, and the blue LED of the dimming block based on the image data and the determined current weight.

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

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

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

[0015] FIG. 4 illustrates an example of a back light unit (BLU) included in a display device according to one embodiment.

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

[0017] FIG. 6 is a diagram showing a control block diagram of a display device according to one embodiment.

[0018] FIG. 7 illustrates an example of a display device according to one embodiment converting dimming data from image data.

[0019] FIG. 8 illustrates an example of a light-emitting element included in a backlight unit of a display device according to one embodiment.

[0020] FIG. 9 is a diagram illustrating image output using a backlight unit including a plurality of color LEDs in a display device according to one embodiment.

[0021] FIG. 10 illustrates the arrangement of a dimming driver, a driving element, and a light-emitting element included in a display device according to one embodiment.

[0022] FIG. 11 illustrates the arrangement of a dimming driver, a driving element, and a light-emitting element included in a display device according to one embodiment.

[0023] FIG. 12 illustrates image blocks of an image in a normal mode of a display device according to one embodiment.

[0024] FIG. 13 illustrates image blocks of an image in a colorblind mode of a display device according to one embodiment.

[0025] FIG. 14A illustrates the change in current value of the RGB LED of the first image block of the image in the normal mode and red-weak mode of a display device according to one embodiment.

[0026] FIG. 14B illustrates the change in current value of the RGB LED of the second image block of the image in normal mode and red-weak mode of a display device according to one embodiment.

[0027] FIG. 15A is a first figure for comparing the operation of performing local dimming in a display device according to one embodiment.

[0028] FIG. 15B is a second figure for comparing the operation of performing local dimming in a display device according to one embodiment.

[0029] FIG. 16 illustrates an example of a flowchart of a control method for a display device according to one embodiment.

[0030] FIG. 17 illustrates an example of a flowchart for acquiring color difference data in a display device according to one embodiment.

[0031] FIG. 18 illustrates an example of a flowchart for determining current weights in a display device according to one embodiment.

[0032] FIG. 19 illustrates an example of a flowchart for controlling the current of an RGB LED by applying a current weighting factor in a display device according to one embodiment.

[0033] FIG. 20 is a diagram illustrating the selection of a color blindness mode in a display device according to one embodiment.

[0034] FIG. 21 is a diagram illustrating the execution of a colorblind mode in a display device according to one embodiment.

[0035] The exemplary embodiments described in this disclosure and the terms used in this disclosure are non-limiting examples, and it should be understood that this disclosure includes various modifications, equivalents, and / or alternatives to said embodiments.

[0036] Additionally, the same reference numerals or symbols presented in each drawing of this specification represent parts or components that perform substantially the same function.

[0037] Additionally, the singular form of the noun corresponding to the item may include one or multiple items, unless the relevant context clearly indicates otherwise.

[0038] Additionally, 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.

[0039] Additionally, the terms "part," "module," and "component" may be implemented in hardware or software. Depending on the embodiments, a plurality of "parts," "modules," and "components" may be implemented as a single component, or a single "part," "module," or "component" may include a plurality of components.

[0040] Furthermore, the terms used in this specification are for describing embodiments and are not intended to limit or / or restrict the disclosed invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as "comprising" or "having" are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and do not preclude the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0041] Additionally, terms including ordinal numbers, such as "first," "second," etc., used herein may be used to describe various components, but said components are not limited by said terms, and said terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component. The term "and / or" includes a combination of a plurality of related described items or any one of a plurality of related described items.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] Meanwhile, terms such as "up / down direction" and "front / back direction" used in the following description are defined based on the drawings, and the shape and position of each component are not limited by these terms. For example, the terms "front" and "rear" below may each be defined based on the X direction shown in the drawings. The terms "up" and "down" below may each be defined based on the Z direction shown in the drawings. The terms "left direction" and "right direction" below may be defined based on the Y direction shown in the drawings. The term "vertical direction" below may each refer to the Z direction shown in the drawings, and the term "horizontal direction" below may each refer to the Y direction shown in the drawings.

[0046] Non-limiting exemplary embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0047] FIG. 1 illustrates an example of the appearance of a display device according to one embodiment.

[0048] 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.

[0049] 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 embodiment may be installed in any indoor location where many people can enter and exit, such as a subway station, shopping mall, movie theater, company, or store.

[0050] 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.

[0051] As illustrated in FIG. 1, the display device (10) may include a main body (11) and a screen (12) that displays an image (I).

[0052] The main body (11) can form the external shape of the display device (10). Inside the main body (11), components for the display device (10) to display an image (I) or perform various functions may be provided. 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 the shape shown in FIG. 1. For example, the main body (11) may be in the shape of a curved plate.

[0053] 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.

[0054] The screen (12) may include a liquid crystal panel capable of passing through or blocking light emitted by a back light unit (BLU), etc.

[0055] Multiple pixels (P) may be formed on the screen (12). An image (I) displayed on the screen (12) may be formed by light emitted by each of the multiple pixels (P). For example, an image (I) may be formed on the screen (12) by combining the light emitted by each of the multiple pixels (P) as if in a mosaic.

[0056] 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.

[0057] The subpixels are red subpixels (P) capable of emitting red light. R ) and a green subpixel (P) capable of emitting green light G ) and a blue subpixel (P) capable of emitting blue light BIt may include ). For example, red light can represent light with wavelengths ranging from approximately 700 nm (nanometer, one-billionth of a meter) to 800 nm. Green light can represent light with wavelengths ranging from approximately 500 nm to 600 nm. Blue light can represent light with wavelengths ranging from approximately 400 nm to 500 nm.

[0058] Red subpixel (P R )'s red light, green subpixel (P G The green light and blue subpixel (P) of ) B By combining the blue light of ), light of various brightness and various colors can be emitted from each of the multiple pixels (P).

[0059] FIG. 2 illustrates an example of the structure of a display device according to one embodiment, and FIG. 3 illustrates an example of a liquid crystal panel included in a display device according to one embodiment.

[0060] Referring to FIG. 2, various components for generating an image (I) on a screen may be provided inside the main body (11).

[0061] For example, the main body (11) is provided with a back light unit (BLU) (100) which is a surface light source, a liquid crystal panel (20) that blocks or passes light emitted from the back light unit (100), a control assembly (50) that controls the operation of the back light unit (100) and the liquid crystal panel (20), and a power assembly (60) that supplies power to the back light 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 back light 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).

[0062] 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.

[0063] The backlight unit (100) is described in more detail below.

[0064] The liquid crystal panel (20) is a display panel and is provided in front of the backlight unit (100), and blocks or passes light emitted from the backlight unit (100) to form an image (I). The liquid crystal panel (20) may include an image display unit that displays the image (I).

[0065] The front surface of the liquid crystal panel (20) forms the screen 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 by the plurality of pixels (P) can form an image (I) displayed on the screen.

[0066] 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).

[0067] 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.

[0068] 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).

[0069] 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).

[0070] 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 (25a) constituting the liquid crystal layer (25) described below.

[0071] 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 a panel driver (30) (see FIG. 6). Additionally, depending on the turning on (closed) or turning 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).

[0072] 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).

[0073] 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.

[0074] 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.

[0075] 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).

[0076] 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).

[0077] 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).

[0078] 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).

[0079] 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.

[0080] FIG. 4 illustrates an example of a back light unit (BLU) included in a display device according to one embodiment, and FIG. 5 is a diagram for explaining that a plurality of light-emitting diodes of the back light unit of a display device according to one embodiment are divided into dimming blocks.

[0081] Referring to 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.

[0082] The light source module (110) may include a plurality of light-emitting elements (111) that emit light and a substrate (112) that supports / fixes the plurality of light-emitting elements (111).

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] The light-emitting element (111) may include a light-emitting diode (LED). The light-emitting diode may be implemented in various sizes and, for example, may include a Mini LED and / or a Micro LED.

[0088] 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.

[0089] 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).

[0090] Additionally, the substrate (112) may include a plurality of sub-substrates.

[0091] 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.

[0092] 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).

[0093] 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).

[0094] Accordingly, a plurality of light-emitting elements (111) can emit light in front of the reflective sheet (120).

[0095] 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).

[0096] Light emitted from a light-emitting element (111) passes through various objects such as a diffuser plate (130) and an optical sheet (140). When light passes through the diffuser plate (130) and the optical sheet (140), some of the incident light is reflected from the surfaces 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).

[0097] 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).

[0098] 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).

[0099] 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.

[0100] 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.

[0101] 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).

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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).

[0109] 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.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] 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).

[0115] A plurality of dimming blocks (200) may be disposed on a substrate (112). That is, N*M light-emitting diodes may be disposed on the substrate (112). Alternatively, a plurality of dimming blocks (200) may each be provided on a plurality of sub-substrates included in the substrate (112). According to some embodiments, N*M LEDs (e.g., dimming blocks 200) may also be referred to as LED groups.

[0116] FIG. 6 is a diagram showing a control block diagram of a display device according to one embodiment, and FIG. 7 illustrates an example of a display device according to one embodiment converting dimming data from image data.

[0117] 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).

[0118] 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.

[0119] 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.

[0120] 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.

[0121] 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).

[0122] 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 data.

[0123] The memory (92) stores programs and data for processing video signals and / or audio signals, and can temporarily store data generated during the processing of video signals and / or audio signals. According to some embodiments, the memory can store computer instructions configured to enable the image processing unit (90) (e.g., at least one processor (91)) to perform its functions when executed by at least one processor (91).

[0124] 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).

[0125] 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.

[0126] 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).

[0127] At least one processor (91) can obtain dimming data from video data decoded from a video signal.

[0128] At least one 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).

[0129] At least one processor (91) can obtain luminance values ​​(L) of multiple dimming blocks (200) from image data of multiple image blocks (IB). Additionally, the processor (91) can generate dimming data by combining the luminance values ​​(L) of multiple dimming blocks (200).

[0130] For example, at least one 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).

[0131] 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.

[0132] At least one processor (91) can set the maximum value among the luminance values ​​of each pixel included in the image block (IB) as the luminance value of the dimming block (200) corresponding to the image block (IB). 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.

[0133] At least one processor (91) can generate dimming data by combining the brightness values ​​of a plurality of dimming blocks (200).

[0134] 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.

[0135] 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.

[0136] 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.

[0137] The panel driver (30) may include, for example, a timing controller, a data driver, a scan driver, etc.

[0138] 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.

[0139] 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.

[0140] 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.

[0141] 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).

[0142] 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.

[0143] 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).

[0144] The dimming driver (170) can convert dimming data (hereinafter referred to as 'digital 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.

[0145] 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.

[0146] 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).

[0147] 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.

[0148] 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.

[0149] FIG. 8 illustrates an example of a light-emitting element included in a backlight unit of a display device according to one embodiment, and FIG. 9 is a drawing for explaining image output using a backlight unit including a plurality of color LEDs in a display device according to one embodiment.

[0150] Referring to FIG. 8, one light-emitting element (111) may include one group of light-emitting diodes (170). That is, one 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).

[0151] A plurality of light-emitting diode groups (170) can be arranged in a two-dimensional matrix form on the upper surface of the substrate (112). That is, as a plurality of light-emitting elements (111) are arranged in rows and columns, a plurality of light-emitting diode groups (170) can be arranged in a two-dimensional matrix form.

[0152] 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.

[0153] 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.

[0154] The 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).

[0155] Each of the plurality of light-emitting elements (111) may include a group of light-emitting diodes (170) and an optical dome (180).

[0156] 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.

[0157] Each light-emitting diode included in the light-emitting diode group (170) 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.

[0158] Each of the light-emitting diodes (190) (red light-emitting diode (190R), green light-emitting diode (190G), blue light-emitting diode (190B)) can be configured to convert electrical energy into light energy. Each of the light-emitting diodes (190) (red light-emitting diode (190R), green light-emitting diode (190G), blue light-emitting diode (190B)) can emit light having a maximum intensity at a predetermined wavelength based on the power supplied. For example, the 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).

[0159] For example, a multilayer reflective structure may be provided on the front surface of each light-emitting diode (190) (red light-emitting diode (190R), green light-emitting diode (190G), blue light-emitting diode (190B)) in which a plurality of insulating films having different refractive indices are alternately stacked. For example, such a multilayer reflective structure may 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 element 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.

[0160] Additionally, the light-emitting diodes (190) (red light-emitting diode (190R), green light-emitting diode (190G), blue light-emitting diode (190B)) of the light-emitting diode group (170) 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.

[0161] 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.

[0162] 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.

[0163] The optical dome (180) can cover the group of light-emitting diodes (170). 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 (170).

[0164] 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.

[0165] 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.

[0166] 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.

[0167] 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.

[0168] 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).

[0169] 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.

[0170] 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).

[0171] 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).

[0172] 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.

[0173] As such, the display device (10) according to one embodiment of the present disclosure includes a light-emitting element (111) comprising a red light-emitting diode (190R), a green light-emitting diode (190G), and a blue light-emitting diode (190B), thereby enabling the local dimming operation of the colorblind mode described later to maximize the effect of the colorblind filter while reducing unnecessary power consumption compared to the local dimming operation using a single light. That is, by using a backlight unit comprising a red light-emitting diode (190R), a green light-emitting diode (190G), and a blue light-emitting diode (190B) rather than a display device comprising a backlight unit comprising only a blue light-emitting diode and a QD (Quantum Dot) sheet, the effect of the colorblind filter in the colorblind mode can be maximized while reducing unnecessary power consumption. In this case, the QD (Quantum Dot) sheet may not be included as a component of the display device.

[0174] FIGS. 10 and 11 illustrate the arrangement of a dimming driver, a driving element, and a light-emitting element included in a display device according to one embodiment.

[0175] Referring to FIGS. 10 and 11, the display device (10) may include a dimming driver (170), a plurality of driving elements (300) (a first driving element (310), a second driving element (320), a third driving element (330), a fourth driving element (340)), and a plurality of light sources (111).

[0176] A plurality of light sources each include a light-emitting diode and can be divided into a plurality of dimming blocks (200). A plurality of light sources belonging to the same dimming block can form a group.

[0177] A plurality of driving elements (300) receive an analog dimming signal from a dimming driver (170) and can supply driving current to a plurality of light sources (111) according to the received analog dimming signal.

[0178] Multiple light sources belonging to a single dimming block may receive current from the same driving element. For example, multiple light sources belonging to a first dimming block (210) may receive driving current from a first driving element (310). Multiple light sources belonging to a second dimming block (220) may receive driving current from a second driving element (320). Multiple light sources belonging to a third dimming block (230) may receive driving current from a third driving element (330). Multiple light sources belonging to a fourth dimming block (240) may receive driving current from a fourth driving element (340). In the same way, multiple light sources belonging to an nth dimming block may receive driving current from the nth driving element.

[0179] As a result, multiple light sources belonging to a single dimming block can be supplied with the same amount of driving current. In addition, multiple light sources belonging to a single dimming block can emit light of the same intensity.

[0180] Additionally, a plurality of light-emitting elements (111) belonging to a single dimming block (200) may include a red light-emitting diode (190R), a green light-emitting diode (190G), and a blue light-emitting diode (190B). In this case, light-emitting diodes of the same color within the same dimming block may receive current from the same driving element along the same current supply line.

[0181] That is, each of the plurality of driving elements may include a plurality of current supply lines for supplying driving current, and each of these current supply lines may be arranged to supply driving current to LEDs of the same color.

[0182] As shown in FIG. 10, a single current supply line from the driving element can be arranged so that only red LEDs are connected to each other, only green LEDs are connected to each other, or only blue LEDs are connected to each other.

[0183] The driving elements (300) receive an analog dimming signal from the dimming driver (170) while input-activated by the dimming driver (170) and can store the received analog dimming signal. Additionally, while input-deactivated, the plurality of driving elements (300) can supply a driving current corresponding to the stored analog dimming signal to the plurality of light sources.

[0184] A plurality of scan lines (e.g., a first scan line (S1), a second scan line (S2)) for providing a scan signal from a dimming driver (170) to a plurality of driving elements (300) and a plurality of data lines (e.g., a first data line (D1), a second data line (D2)) for providing an analog dimming signal from the dimming driver (170) to a plurality of driving elements (300) are provided.

[0185] Multiple dimming blocks (200) may be arranged in multiple rows and multiple columns. Driving elements that supply driving current to light sources of dimming blocks belonging to the same row may share the same scan line. For example, a first driving element (310) and a second driving element (320) may share a first scan line (S1), and a third driving element (330) and a fourth driving element (340) may share a second scan line (S2).

[0186] Additionally, driving elements that supply driving current to light sources of dimming blocks belonging to the same column may share the same data line. For example, the first driving element (310) and the third driving element (330) may share the first data line (D1), and the second driving element (320) and the fourth driving element (340) may share the second data line (D2).

[0187] A plurality of driving elements (300) are input-activated by a scan signal of a dimming driver (170) and can receive an analog dimming signal of the dimming driver (170).

[0188] For example, while the dimming driver (170) outputs a scan signal through the first scan line (S1), the first driving element (310) and the second driving element (320) can receive an analog dimming signal through the first data line (D1) and the second data line (D2), respectively. On the other hand, the third driving element (330) and the fourth driving element (340) cannot receive an analog dimming signal.

[0189] Additionally, while the dimming driver (170) outputs a scan signal through the second scan line (S2), the third driving element (330) and the fourth driving element (340) can receive an analog dimming signal through the first data line (D1) and the second data line (D2), respectively. On the other hand, the first driving element (310) and the second driving element (320) cannot receive an analog dimming signal.

[0190] When a plurality of driving elements (300) receive an analog dimming signal, they store the received analog dimming signal and supply driving current to a plurality of light sources according to the stored analog dimming signal.

[0191] For example, even while the dimming driver (170) outputs a scan signal through the first scan line (S1), the third driving element (330) and the fourth driving element (340) can supply driving current to a plurality of light sources included in the third dimming block (230) and the fourth dimming block (240).

[0192] Additionally, while the dimming driver (170) outputs a scan signal through the second scan line (S2), the first driving element (310) and the second driving element (320) can supply driving current to a plurality of light sources included in the first dimming block (210) and the second dimming block (220).

[0193] By driving in this active matrix manner, a plurality of driving elements (300) can sequentially receive analog dimming signals from a dimming driver (170), and can supply driving current to a plurality of light sources even during an input-deactivated state when they do not receive analog dimming signals from the dimming driver (170).

[0194] In addition, by driving in an active matrix manner, the number of pins of the dimming driver (170) for providing analog dimming signals to multiple dimming blocks (200) is reduced. In addition, the number of signal lines for providing analog dimming signals from the dimming driver (170) to multiple dimming blocks (200) is reduced. Accordingly, the number of dimming blocks can be increased without limiting the number of pins of the dimming driver (170).

[0195] Multiple driving elements (300) may include circuits of various topologies to implement active matrix driving.

[0196] For example, each of the plurality of driving elements (300) may include a circuit of a 1C2T (one capacitor two transistor) topology.

[0197] Each of the plurality of driving elements (300) may include a driving transistor (Tdr), a switching transistor (Tsw), and a storage capacitor (Cs).

[0198] The driving transistor (Tdr) may include an input terminal, an output terminal, and a control terminal. The input terminal of the driving transistor (Tdr) is connected to a power supply (Vdd), and the output terminal may be connected to a plurality of light sources. The driving transistor (Tdr) may supply driving current to the plurality of light sources according to the voltage of the control terminal.

[0199] A storage capacitor (Cs) is provided between the driving transistor (Tdr) and the output terminal and control terminal. The storage capacitor (Cs) can output a constant voltage by storing the input charge. The driving transistor (Tdr) can supply driving current to multiple light sources according to the voltage output by the storage capacitor (Cs).

[0200] The switching transistor (Tsw) also includes an input terminal, an output terminal, and a control terminal. The input terminal of the switching transistor (Tsw) is connected to a data line (e.g., a first data line (D1), a second data line (D2)), and the output terminal of the switching transistor (Tsw) can be connected to the control terminal of the driving transistor (Tdr). The control terminal of the switching transistor (Tsw) can be connected to a scan line (e.g., a first scan line (S1), a second scan line (S2)).

[0201] The switching transistor (Tsw) is turned on by a scan signal of a scan line (first scan line (S1), second scan line (S2)) and can transmit an analog dimming signal of a data line (first data line (D1), second data line (D2)) to a storage capacitor (Cs) and a driving transistor (Tdr). The analog dimming signal of the data line (first data line (D1), second data line (D2)) is input to the control terminal of the driving transistor (Tdr), and the driving transistor (Tdr) can supply a driving current corresponding to the analog dimming signal to a plurality of light sources. The storage capacitor (Cs) stores the charge from the analog dimming signal and can output a voltage corresponding to the analog dimming signal.

[0202] Afterwards, even if the input of the scan signal is stopped and the switching transistor (Tsw) is turned off, the storage capacitor (Cs) still outputs a voltage corresponding to the analog dimming signal, and the driving transistor (Tdr) can still supply a driving current corresponding to the analog dimming signal to multiple light sources.

[0203] The circuit illustrated in FIG. 11 is merely an example of a driving element (300) and is not limited thereto. For example, the driving element (300) may include a circuit of a 3T1C topology with an additional transistor to correct the body effect of the driving transistor (Tdr).

[0204] The driving element (300) may be provided as a single chip in which the circuit shown in FIG. 11 is integrated, for example. In other words, the circuit shown in FIG. 11 may be integrated into a single semiconductor chip.

[0205] As described above, the display devices of the comparative examples used only blue LEDs with high bandgap energy as a light source. Red and green QD particles, upon receiving energy from the blue light, switched colors on their own to emit red and green light, and combined these to produce high-efficiency, high-purity primary colors. In the comparative examples, since only blue LEDs were used as light sources, RGB color control was mostly handled by a thin-film transistor (TFT) substrate and a color filter that controlled the liquid crystal transmittance of the liquid crystal cell. Additionally, the color blindness filter function was controlled by the liquid crystal transmittance control at the liquid crystal cell stage and the color filter.

[0206] For example, in comparative embodiments, the conventional color blindness filter function for red-blind users increased the current of the LEDs in the backlight unit and increased the liquid crystal transmittance to express stronger red light in order to enhance the red sensation. To increase the brightness of the red light, the current of the blue LED itself had to be increased, and the liquid crystal layer had to be adjusted to allow stronger red light to pass through. As a result, luminous efficiency was reduced and power consumption could increase due to the emission of unnecessary green and blue light. Furthermore, when there was a limit to increasing the LED current, red-based colors had to be significantly changed to purple through software to enhance the red-green color contrast, which distorted the original colors and hindered accurate color perception.

[0207] A display device (10) according to one embodiment of the present disclosure uses RGB LEDs as a light source and can implement a color blindness filter function that is highly color-distinguishing and power-efficient by analyzing color differences in real-time for each video frame in color blindness mode and controlling the current of the RGB LEDs for each dimming block. Accordingly, the visual experience can be enhanced by enabling a person with color vision deficiency to perceive colors more clearly, and the overall power consumption can be reduced by applying a method of adjusting the current weight of each LED differently according to the dimming block.

[0208] FIG. 12 illustrates image block A and image block B of an image in a normal mode of a display device according to one embodiment, and FIG. 13 illustrates image block A and image block B of an image in a colorblind mode of a display device according to one embodiment.

[0209] Referring to FIGS. 12 and 13, image block A (region) on the image (I) in normal mode and image block A on the image (I) in colorblind mode are the same region (same image block).

[0210] The B image block in the normal mode image (I) and the B image block in the colorblind mode image (I) are the same area (same image block).

[0211] Image block A (Region 1) may be an area where it is difficult to distinguish colors from adjacent blocks. Image block A may be an area where the color difference with adjacent blocks is relatively small. Image block B (Region 2) may be an area where the color distinction with adjacent blocks is relatively easy. Image block B may be an area where the color difference with adjacent blocks is relatively large.

[0212] At least one processor (91) (see FIG. 6) can adjust the current values ​​supplied to the red LED (190R), green LED (190G), and blue LED (190B) of the first dimming block corresponding to the A video block (first area) and the red LED (190R), green LED (190G), and blue LED (190B) of the second dimming block corresponding to the B video block (second area) as the video mode changes from a normal viewing mode to a colorblind mode (e.g., red-blind mode) in which the colorblind filter function is activated, in accordance with the type of colorblind mode.

[0213] The display device (10) is designed to output standard colors, but some users cannot fully experience these colors due to color blindness. For example, users with red color blindness perceive red light more weakly than green and blue light because their spectral sensitivity to red light is abnormal. Therefore, in red color blindness mode, a red color blindness filter function can be provided to correct the color to clearly distinguish colors while allowing the original color to be felt as much as possible by increasing the current of the red LED by the amount of red light perceived weakly by the red color blindness user, or by lowering the current of the green LED or blue LED. In addition, a green color blindness filter function and a blue color blindness filter function can be provided in the same way as the method of implementing the red color blindness filter function.

[0214] Color blindness modes may include red-blindness mode, green-blindness mode, blue-blindness mode, etc., depending on the type of color blindness. Color blindness modes are not limited to these and may include a wider variety of modes. The red-blindness mode may provide a red-blindness filter function that corrects to allow users with red-blindness to perceive the original red sensation as much as possible by increasing the current of the red LED or decreasing the current of the green or blue LED. The green-blindness mode may provide a green-blindness filter function that corrects to allow users with green-blindness to perceive the original green sensation as much as possible by increasing the current of the green LED or decreasing the current of the red or blue LED. The blue-blindness mode may provide a blue-blindness filter function that corrects to allow users with blue-blindness to perceive the original blue sensation as much as possible by increasing the current of the blue LED or decreasing the current of the red or green LED.

[0215] FIGS. 14A and 14B illustrate the change in current values ​​of RGB LEDs in image block A (first region) and image block B (second region) of an image in normal mode and red-weak mode of a display device according to one embodiment.

[0216] Referring to FIGS. 14A and 14B, the A image block (first region) of normal mode and the A image block of red-weak mode are the same region. The B image block (second region) of normal mode and the B image block of red-weak mode are the same region.

[0217] Image block A may be an area where the color difference from adjacent blocks is relatively small, making it difficult to distinguish between them. For example, it could be an area where a red-colored object is located on a red background.

[0218] Image block B may be an area where the color difference from adjacent blocks is relatively large, making it relatively easy to distinguish between them by color. For example, it could be an area where red-colored objects are located on a blue background.

[0219] When the mode is changed from normal mode to red-weak mode, the current value supplied to the red LED (190R), green LED (190G), and blue LED (190B) of the first dimming block corresponding to the A image block (first area) in normal mode can be changed to the current value supplied to the red LED (190R), green LED (190G), and blue LED (190B) of the first dimming block corresponding to the A image block (first area) in red-weak mode.

[0220] Since the A image block is an area where it is relatively difficult to distinguish from adjacent colors, the current weighting (W) of the red LED (190R) is used for fine color distinction as the mode changes from normal mode to red-weak mode. R ) is the current weighting factor (W) of the green LED (190G). G ) and the current weighting factor (W) of the blue LED (190B) B It can be higher than ). In addition, along with this, the current weighting factor (W) of the blue LED B ) is the current weighting factor (W) of the green LED (190G). G Color discrimination ability can be enhanced by adjusting brightness by slightly increasing it compared to ).

[0221] Referring to FIG. 14A, the current values ​​supplied to the red LED (190R), green LED (190G), and blue LED (190B) of the first dimming block corresponding to the A image block (first area) according to the image data in normal mode are shown.

[0222] In normal mode, the current value (410) supplied to the red LED (190R) of the first dimming block corresponding to the A image block (first area) according to the image data is I R The current value (420) supplied to the green LED (190G) is mA, and I G The current value (430) supplied to the blue LED (190B) is mA, and I B It could be mA. Here, I R , I G , and I BThese are current values ​​in milliamperes (mA) (410, 420, 430), respectively.

[0223] Additionally, referring to FIG. 14A, the current values ​​supplied to the red LED (190R), green LED (190G), and blue LED (190B) of the first dimming block corresponding to the A image block (first area) according to the image data in red-weak mode are shown.

[0224] In red-weak mode, the current value (411) supplied to the red LED (190R) according to the image data is I R× W R The current value (421) supplied to the green LED (190G) is mA, and I G× W G The current value (431) supplied to the blue LED (190B) is mA, and I B× W B It could be mA. Here, I R and W R The product of, I G W G The product of, and I B W B The products of are current values ​​in units of milliamperes (mA) (411, 421, 431), respectively.

[0225] For example, the current weighting W of the red LED (190R), green LED (190G), and blue LED (190B) of the first dimming block corresponding to image block A (first region). R , W G , W B can be 1.2, 0.75, and 0.9, respectively. That is, when the default value of the current weight is 1, the current weight W R is a value increased by 20% from the default value, and W G is a value reduced by 25% from the default value, and W B can be a value reduced by 10% from the default value. Each current weight is not limited to the presented values ​​and can be implemented in various forms.

[0226] Accordingly, the current value (410) supplied to the red LED (190R) of the first dimming block corresponding to the A image block (first area) according to the image data is I R× The current value (420) supplied to the green LED (190G) is 1.2 mA, and I G× The current value (430) supplied to the blue LED (190B) is 0.75 mA, and I B× It could be 0.9 mA.

[0227] In this way, in the case of an area where it is relatively difficult to distinguish from adjacent colors, such as image block A (first area), the current weight (W) of the red LED (190R) in red-weak mode R ) is the current weighting factor (W) of the green LED (190G). G ) and the current weighting factor (W) of the blue LED (190B) B By increasing the current weight of the blue LED more than that of the green LED (190G), users with red-green color blindness can distinguish fine colors. At this time, the brightness can be corrected by increasing the current weight of the blue LED more than that of the green LED (190G), thereby enhancing the ability to distinguish colors.

[0228] In addition, since the B image block (second region) is a region where it is relatively easy to distinguish from adjacent colors, the current weighting (W) of the green LED (190G) is used to reduce power consumption as the mode changes from normal mode to red-weak mode. G ) and the current weighting factor (W) of the blue LED (190B) B The current value can be lowered compared to the red LED (190R). Since users with red vision deficiency perceive the red channel weakly compared to the green and blue channels, for example, at a level of 0.75, the current values ​​of the green LED (190G) and blue LED (190B) can be lowered inversely to 0.75 to compensate.

[0229] Referring to FIG. 14B, the current value (410) supplied to the red LED (190R) of the second dimming block corresponding to the B image block (second area) according to the image data in normal mode is I RThe current value (420) supplied to the green LED (190G) is mA, and I G The current value (430) supplied to the blue LED (190B) is mA, and I B It could be mA. Here, I R , I G , and I B These are current values ​​in milliamperes (mA) (410, 420, 430), respectively.

[0230] The current value (411) supplied to the red LED (190R) of the second dimming block corresponding to the B image block (second area) according to the image data in red-weak mode is I R× W R The current value (421) supplied to the green LED (190G) is mA, and I G× W G The current value (431) supplied to the blue LED (190B) is mA, and I B× W B It could be mA. Here, I R and W R The product of, I G W G The product of, and I B W B The products of are current values ​​in units of milliamperes (mA) (411, 421, 431), respectively.

[0231] For example, the current weighting W of the red LED (190R), green LED (190G), and blue LED (190B) of the second dimming block corresponding to the B image block (second region). R , W G , W B can be 1.0, 0.75, and 0.75, respectively. That is, when the default value of the current weight is 1, the current weight W R is a value that retains the default value, and W G and W B All can be values ​​reduced by 25% from the default values. Each current weight is not limited to the presented values ​​and can be implemented in various forms.

[0232] Accordingly, the current value (410) supplied to the red LED (190R) of the second dimming block corresponding to the B image block (second area) according to the image data is I R× The current value (420) supplied to the green LED (190G) is 1.0 mA, and I G× The current value (430) supplied to the blue LED (190B) is 0.75 mA, and I B× It can be 0.75 mA.

[0233] In this way, in the case of an area where it is relatively easy to distinguish from adjacent colors, such as the B image block (second area), the current weight (W) of the green LED (190G) in red-weak mode G ) and the current weighting factor (W) of the blue LED (190B) B ) is the current weighting factor ((W) of the red LED (190R). R By lowering it compared to ), it is possible to improve color perception for users with red-blindness while reducing excessive current usage, thereby reducing power consumption.

[0234] As described above, the display device (10) according to one embodiment of the present disclosure can implement a power-efficient color blindness filter by comparing the color difference with surrounding blocks and inputting different current weights according to the local dimming area to control dimming data. That is, by implementing a color blindness filter by adjusting the current weights of the RGB LEDs differently for each dimming block through a comparison of color values ​​with adjacent areas, local dimming control for each color channel is performed using RGB LEDs, and by dividing the area to correct colors for color blindness filtering, power consumption can be reduced along with more precise RGB color control.

[0235] FIGS. 15A and 15B are drawings for comparing the operation of performing local dimming in a display device according to one embodiment.

[0236] Referring to FIGS. 15A and 15B, controlling the current supplied to the red LED (190R), green LED (190G), and blue LED (190B) based on current weighting and image data according to the type of colorblind mode selected by the user can be performed through Pulse Amplitude Modulation (PAM) control. PAM control can control the brightness of each LED by fixing the width of the pulse constant and changing only the amplitude at regular intervals. Through PAM control, the current of each LED can be adjusted according to the image data and current weighting to control the brightness of the red LED (190R), green LED (190G), and blue LED (190B).

[0237] As shown in FIG. 15A, according to comparative embodiments, a single light backlight unit is included, and a color blindness filter function is implemented through PAM control for the single light.

[0238] As shown in FIG. 15B, according to the present disclosure, a backlight unit (100) using RGB LEDs as a light source may be provided. By determining different current weights for each LED per dimming block through comparison of color values ​​with adjacent areas and controlling the supply of current with the applied current weights to each LED through PAM control, a color blindness filter function can be implemented more effectively.

[0239] Brightness can also be adjusted by controlling the current supplied to each LED for each dimming block and then performing additional PWM control for each LED.

[0240] FIG. 16 illustrates an example of a flowchart of a control method for a display device according to one embodiment.

[0241] Referring to FIG. 16, at least one processor (91) can start a colorblind mode (500).

[0242] At least one processor (91) can start a colorblind mode in response to the user selecting a colorblind mode.

[0243] At least one processor (91) can obtain color difference values ​​between multiple image blocks corresponding to multiple dimming blocks based on image data in response to the initiation of a color blindness mode (510).

[0244] At least one processor (91) can determine the current weight of at least one of the red LED (190R), green LED (190G) and blue LED (190B) of the multiple dimming blocks based on the color difference value between the multiple image blocks (520).

[0245] At least one processor (91) can control the current supplied to at least one of the red LED (190R), green LED (190G), and blue LED (190B) of a plurality of dimming blocks based on image data and current weighting.

[0246] At least one processor (91) can determine the current weight of the RGB LEDs of the dimming blocks corresponding to the image blocks based on the type of color blindness mode and the color difference value between the image blocks. The type of color blindness mode may include information on the types of color vision modes, such as red-blindness mode, green-blindness mode, and blue-blindness mode.

[0247] Accordingly, the display device (10) according to one embodiment of the present disclosure uses RGB LEDs as a light source and can implement a color blindness filter function that is highly color-discriminating and power-efficient by analyzing color differences in real-time for each video frame in color blindness mode and controlling the current of the RGB LEDs for each dimming block. As a result, the visual experience can be improved by enabling a person with color vision deficiency to perceive colors more clearly, and the overall power consumption can be reduced by applying a method of adjusting the current weight of each LED differently according to the dimming block.

[0248] FIG. 17 illustrates an example of a flowchart for obtaining a color difference value in a display device according to one embodiment.

[0249] Referring to FIG. 17, at least one processor (91) can acquire color data of pixels included in a plurality of image blocks corresponding to a plurality of dimming blocks based on image data (512).

[0250] At least one processor (91) can collect the color data of each pixel into RGB coordinate values.

[0251] At least one processor (91) can sum all RGB values ​​of the image block corresponding to the dimming block based on the collected RGB values.

[0252] At least one processor (91) can determine the average color value of each image block (x, y) by averaging the summed RGB values ​​(514).

[0253] At least one processor (91) can determine the color difference value between adjacent image blocks by comparing the average color values ​​of adjacent image blocks among a plurality of image blocks (516).

[0254] Generally, the RGB model classifies colors as a combination of three components: red (R), green (G), and blue (B). In the RGB model, each of R, G, and B can have a value between 0 and 255. In the RGB model, the color difference between two points ((R1, G1, B1), (R2, G2, B2)) can be calculated using the Euclidean distance (d).

[0255] Specifically, the Euclidean distance (d) corresponding to the color difference value between two points can be calculated by the following equation [1].

[0256] - [Equation 1]

[0257] At least one processor (91) can calculate the color difference between adjacent blocks to generate a color difference value (δE), and increase the color contrast that a colorblind person can perceive through the color difference value.

[0258] For example, the first image block (2.2) and the second image block (2.3) are adjacent image blocks, and if the average color value of the first image block (2.2) is (200, 150, 100) and the average color value of the second image block (2.3) is (180, 160, 120), the color difference value (δE 2.2.2.3 ) can be calculated as follows.

[0259] δE 2.2.2.3 = = 30

[0260] FIG. 18 illustrates an example of a flowchart for determining current weights in a display device according to one embodiment.

[0261] Referring to FIG. 18, at least one processor (91) determines the current weight (W) of the red LED (190R) of a plurality of dimming blocks (200) based on the fact that the colorblind mode is a red-blind mode. R ) is the current weighting factor (W) of the green LED (190G). G ) and the current weighting factor (W) of the blue LED (190B) B It can be determined as a value higher than ).

[0262] First, the processor (91) can determine whether the color difference value between adjacent image blocks (IB) exceeds a preset value based on whether the color blindness mode is a red blindness mode (522).

[0263] At least one processor (91) determines that if the color difference value between adjacent image blocks (IB) exceeds a preset value (522, e.g.), the current weight (W) of the green LED (190G) of the corresponding dimming block (200) corresponding to the image block (IB) G ) and the current weighting factor (W) of the blue LED (190B) B) is the current weighting factor (W) of the red LED (190R). R It can be lowered compared to ) (524).

[0264] As shown in image block B (first region) of FIG. 14, if the color difference value between adjacent image blocks (IB) exceeds a preset value, since the image block is an area where color distinction with adjacent image blocks is relatively easy, the current weighting (W) of the green LED (190G) is used to reduce power consumption. G ) and the current weighting factor (W) of the blue LED (190B) B ) can be lowered compared to the red LED (190R).

[0265] For example, the current weighting W of the red LED (190R), green LED (190G), and blue LED (190B) of the second dimming block corresponding to the B image block (second region). R , W G , W B can be 1.0, 0.75, and 0.75, respectively. That is, when the default value of the current weight is 1, the current weight W R is a value that retains the default value, and W G and W B All can be values ​​reduced by 25% from the default value.

[0266] In this way, the current weighting (W) of the green LED (190G) in red-weak mode G ) and the current weighting factor (W) of the blue LED (190B) B ) is the current weighting factor (W) of the red LED (190R). R By lowering it compared to ), power consumption can be reduced while improving color perception for users with red-blindness.

[0267] Additionally, if at least one processor (91) determines that the color difference value between adjacent image blocks (IB) is less than or equal to a preset value (522, no), the current weight (W) of the red LED (190R) of the corresponding dimming block (200) corresponding to the image block (IB) is less than or equal to a preset value. R) is the current weighting factor (W) of the green LED (190G). G ) and the current weighting factor (W) of the blue LED (190B) B It can be increased above ) (526). Therefore, users with red-green color blindness can distinguish fine colors. At this time, the processor (91) can increase the current weight (W) of the blue LED. B ) is the current weighting factor (W) of the green LED (190G). G It can be raised higher than ) (528). Therefore, the brightness can be corrected, and the ability to distinguish colors can be enhanced.

[0268] As shown in image block A (first region) of FIG. 14, if the color difference value between adjacent image blocks (IB) is less than or equal to a preset value (522, No), the image block is an area where it is relatively difficult to distinguish colors from adjacent image blocks; therefore, in order to enable fine color distinction for users with red-blindness and to enhance color distinction ability, the current weighting (W) of the red LED (190R) R ) is the current weighting factor (W) of the green LED (190G). G ) and the current weighting factor (W) of the blue LED (190B) B Along with increasing the current weighting of the blue LED (W) compared to ) B ) is the current weighting factor (W) of the green LED (190G). G It can be higher than ). At this time, the current weighting factor (W) of the blue LED (190B) B The reduction ratio of ) is the current weighting (W) of the green LED (190G). G It can be made lower than the reduction rate of ).

[0269] For example, the current weighting W of the red LED (190R), green LED (190G), and blue LED (190B) of the first dimming block corresponding to image block A (first region). R , W G , W B can be 1.2, 0.75, and 0.9, respectively. That is, when the default value of the current weight is 1, the current weight WR is a value increased by 20% from the default value, and W G is a value reduced by 25% from the default value, and W B can be a value reduced by 10% from the default value.

[0270] In this way, the current weighting (W) of the red LED (190R) in red-weak mode R ) is the current weighting factor (W) of the green LED (190G). G ) and the current weighting factor (W) of the blue LED (190B) B Along with increasing the current weighting of the blue LED (W) compared to ) B ) is the current weighting factor (W) of the green LED (190G). G By increasing it above ), users with red-blindness can be made to distinguish fine colors and their color discrimination ability can be enhanced.

[0271] Additionally, if at least one processor (91) determines that the color difference value between adjacent image blocks (IB) is less than or equal to a preset value (522, no), the current weight (W) of the red LED (190R) of the corresponding dimming block (200) corresponding to the image block (IB) is less than or equal to a preset value. R ) is determined as the first current weight, and if the color difference value exceeds a preset value (522, e.g.), the current weight (W) of the red LED (190R) of the corresponding dimming block (200) is determined. R ) can be determined as the second current weight. In this case, the first current weight may be a value greater than the second current weight. Therefore, the red color of an area where it is relatively difficult to distinguish color from adjacent image blocks can be enhanced in contrast to the red color of an area where it is relatively easy to distinguish color from adjacent image blocks.

[0272] Additionally, at least one processor (91) determines the current weight (W) of the green LED (190G) of the plurality of dimming blocks (200) based on the fact that the color blindness mode is a green blindness mode. G ) is the current weighting factor (W) of the red LED (190R). R) and the current weighting factor (W) of the blue LED (190B) B It can be determined as a value higher than ).

[0273] At least one processor (91) has a current weighting factor (W) of the red LED (190R) of the corresponding dimming block (200) corresponding to the image block (IB) when the color difference value between adjacent image blocks (IB) exceeds a preset value. R ) and the current weighting factor (W) of the blue LED (190B) B ) is the current weighting factor (W) of the green LED (190G). G It can be lowered compared to ).

[0274] For example, the current weight W of the red LED (190R), green LED (190G), and blue LED (190B). R , W G , W B can be 0.75, 1.0, and 0.75, respectively. That is, when the default value of the current weight is 1, the current weight W G is a value that retains the default value, and W R and W B All can be values ​​reduced by 25% from the default value.

[0275] In this way, the current weighting (W) of the red LED (190R) in green pill mode R ) and the current weighting factor (W) of the blue LED (190B) B ) is the current weighting factor (W) of the green LED (190G). G By lowering it compared to ), power consumption can be reduced while improving color perception for users with green vision deficiency.

[0276] Additionally, if at least one processor (91) determines that the color difference value between adjacent image blocks (IB) is less than or equal to a preset value, the current weight (W) of the green LED (190G) of the corresponding dimming block (200) corresponding to the image block (IB) G ) is the current weighting factor (W) of the red LED (190R). R) and the current weighting factor (W) of the blue LED (190B) B It can be increased more than ). Therefore, users with green vision can distinguish fine colors. At this time, the processor (91) can increase the current weight of the blue LED more than the current weight of the red LED (190R). Thus, brightness can be corrected, and color discrimination ability can be enhanced.

[0277] If the color difference value between adjacent image blocks (IB) is less than or equal to a preset value, the image block is an area where color distinction with adjacent image blocks is relatively difficult; therefore, to enable fine color distinction for users with green blindness and to enhance color distinction ability, the current weighting (W) of the green LED (190G) G ) is the current weighting factor (W) of the red LED (190R). R ) and the current weighting factor (W) of the blue LED (190B) B Along with increasing the current weighting of the blue LED (W) compared to ) B ) is the current weighting factor (W) of the red LED (190R). R It can be higher than ). At this time, the current weighting factor (W) of the blue LED (190B) B The reduction ratio of ) is the current weight (W) of the red LED (190R). R It can be made lower than the reduction rate of ).

[0278] For example, the current weight W of the red LED (190R), green LED (190G), and blue LED (190B). R , W G , W B can be 0.75, 1.2, and 0.9, respectively. That is, when the default value of the current weight is 1, the current weight W G is a value increased by 20% from the default value, and W R is a value reduced by 25% from the default value, and W B can be a value reduced by 10% from the default value.

[0279] In this way, the current weighting (W) of the green LED (190G) in green pill mode G ) is the current weighting factor (W) of the red LED (190R). R ) and the current weighting factor (W) of the blue LED (190B) B Along with increasing the current weighting of the blue LED (W) compared to ) B ) is the current weighting factor (W) of the red LED (190R). R By increasing it above ), users with green vision deficiency can be made to distinguish fine colors and their color discrimination ability can be enhanced.

[0280] Additionally, if at least one processor (91) determines that the color difference value between adjacent image blocks (IB) is less than or equal to a preset value, the current weight (W) of the green LED (190G) of the corresponding dimming block (200) corresponding to the image block (IB) G ) is determined as the first current weight, and if the color difference value exceeds a preset value, the current weight (W) of the green LED (190G) of the corresponding dimming block (200) is determined. G ) can be determined as the second current weight. In this case, the first current weight may be a value greater than the second current weight. Therefore, the green color of an area where color distinction with adjacent image blocks is relatively difficult can be enhanced in contrast to the green color of an area where color distinction with adjacent image blocks is relatively easy.

[0281] Additionally, at least one processor (91), based on the fact that the color blindness mode is a blue blindness mode, determines the current weight (W) of the green LED (190G) of the plurality of dimming blocks (200) in the same manner as the red blindness mode or green blindness mode. G ) is the current weighting factor (W) of the red LED (190R). R ) and the current weighting factor (W) of the blue LED (190B) B ) can be determined.

[0282] Additionally, the processor (91) similarly [calculates] the current weight (W) of the green LED (190G) of the plurality of dimming blocks (200) according to various color blindness modes. G ) is the current weighting factor (W) of the red LED (190R). R ) and the current weighting factor (W) of the blue LED (190B) B ) can be determined.

[0283] FIG. 19 illustrates an example of a flowchart for controlling the current of an RGB LED by applying a current weighting factor in a display device according to one embodiment.

[0284] Referring to FIG. 19, at least one processor (91) has a current weight (W) of a red LED (190R) per dimming block. R The current of the red LED (190R) can be determined by applying ) (532).

[0285] At least one processor (91) has a current weight (W) of a green LED (190G) per dimming block. G The current of the green LED (190G) can be determined by applying ) (534).

[0286] At least one processor (91) has a current weighting factor (W) of a blue LED (190B) per dimming block. B The current of the blue LED (190B) can be determined by applying ) (536).

[0287] At least one processor (91) can control the current value supplied to the red LED (190R), green LED (190G), and blue LED (190B) of each dimming block through PAM control so that the current value of the red LED (190R), green LED (190G), and blue LED (190B) of each dimming block reaches the determined current value of the red LED (190R), green LED (190G), and blue LED (190B) (538).

[0288] Accordingly, a display device (10) according to one embodiment of the present disclosure uses an RGB LED as a light source and can implement a color blindness filter function that is highly color-distinguishing and power-efficient by analyzing the color difference in real-time for each video frame in color blindness mode and controlling the current of the RGB LED for each dimming block.

[0289] FIG. 20 is a diagram illustrating the selection of a colorblind mode in a display device according to one embodiment, and FIG. 21 is a diagram illustrating the execution of a colorblind mode in a display device according to one embodiment.

[0290] Referring to FIGS. 20 and 21, the display device (10) may further include an input unit (not shown) for receiving user input. The user may input user commands to the input unit through an external device such as a remote control or a separate control unit provided on the display device (10).

[0291] At least one processor (91) can select a colorblind mode in the image mode based on a user command received through the input section.

[0292] The display device (10) can provide a user interface for receiving a desired colorblind mode from the user. When the user inputs a command to select a colorblind mode by operating an external device such as a remote control, the processor (91) can execute the selected colorblind mode.

[0293] Color blindness modes can be classified into red-blindness, green-blindness, blue-blindness, etc., depending on the type of color blindness. Users can select one of these to set a video mode suitable for their color vision deficiency.

[0294] Red-blindness mode is designed for people who have difficulty distinguishing red, and it can change the screen's hue by adjusting color contrast so that red is more clearly distinguishable.

[0295] Green blindness mode can be adjusted to better recognize green-related colors for users who have difficulty distinguishing green.

[0296] Blue blindness mode can increase blue contrast by appropriately adjusting screen colors to help users who have difficulty perceiving blue.

[0297] People with color blindness can watch videos with appropriate color tones by selecting and running a color blindness mode that suits their specific color blindness characteristics.

[0298] For example, when red-blindness mode is selected, it is immediately activated and adjusts the screen colors to help users with red-blindness distinguish colors more clearly. This allows users with red-blindness to easily access various color-based information and improves the user experience.

[0299] As described above, the display device (10) according to one embodiment of the present disclosure enables the implementation of an efficient color blindness filter by independently controlling dimming data for each LED by adjusting the current weight of the RGB LED differently according to the difference in color values ​​with adjacent blocks. Since it is essential to increase the current of LEDs of specific colors that are difficult for colorblind people to perceive, the current weight of the corresponding LED can be relatively increased in areas where color distinction is difficult, and the current weight of the corresponding LED can be relatively lowered in areas where distinction is relatively easy, thereby optimizing the current of each LED according to the image. For example, if the majority of the area consists of colors that are easy to distinguish, the current weight can be flexibly set low for that area to increase energy efficiency.

[0300] A display device (10) according to one embodiment of the present disclosure can implement a color blindness filter function that controls the current of RGB LEDs per dimming block through real-time color difference analysis. By analyzing and adjusting color data and current weights in real-time according to the image, it can always provide the user with optimal color recognition and a power-efficient color blindness filter function. By optimizing the color difference between image blocks, it can provide a clear color recognition experience according to the type of color vision deficiency of the colorblind person, and it can maximize energy efficiency by reducing unnecessary current consumption and concentrating current distribution to necessary areas. Furthermore, it can reduce unnecessary power loss and provide a high level of visual experience to the colorblind person through more precise color control.

[0301] According to some embodiments of the present disclosure, a display device (10) uses RGB LEDs as a light source and can implement a color blindness filter function that is highly color-distinguishing and power-efficient by analyzing color differences in real-time for each video frame in color blindness mode and controlling the current of the RGB LEDs for each dimming block. Accordingly, the visual experience can be enhanced by enabling a person with color vision deficiency to perceive colors more clearly, and the overall power consumption can be reduced by applying a method of adjusting the current weight of each LED differently according to the dimming block.

[0302] A display device (10) according to one embodiment of the present disclosure comprises: an image display unit; a backlight unit (100) that provides light to the image display unit; and at least one processor (91) that controls the image display unit and the backlight unit (100). The backlight unit (100) comprises: a substrate (112); and a plurality of dimming blocks (200) arranged in a plurality of rows and a plurality of columns on the substrate (112), each comprising a red LED (190R), a green LED (190G), and a blue LED (190B). Including, in a colorblind mode, the at least one processor (91) obtains a color difference value between a plurality of image blocks (IB) corresponding to the plurality of dimming blocks (200) based on image data, determines a current weight of at least one of the red LED (190R), green LED (190G), and blue LED (190B) of the plurality of dimming blocks (200) based on the color difference value between the plurality of image blocks (IB), and controls the current supplied to at least one of the red LED (190R), green LED (190G), and blue LED (190B) of the plurality of dimming blocks (200) based on the image data and the current weight.

[0303] The above at least one processor (91) can determine the average color value of each of the plurality of image blocks (IB) based on the color data of pixels included in the plurality of image blocks (IB), and determine the color difference value between adjacent image blocks (IB) by comparing the average color values ​​of adjacent image blocks (IB) among the plurality of image blocks (IB).

[0304] The above at least one processor (91) can determine the current weight of the red LED (190R) of the plurality of dimming blocks (200) to be higher than the current weight of the green LED (190G) and the blue LED (190B), based on the fact that the colorblind mode is a red-blind mode.

[0305] The above at least one processor (91) determines the current weight of the red LED (190R) of the corresponding dimming block (200) corresponding to the image block (IB) as a first current weight when the color difference value between adjacent image blocks (IB) among the plurality of image blocks is less than or equal to a preset value, and determines the current weight of the red LED (190R) of the corresponding dimming block (200) as a second current weight when the color difference value exceeds the preset value, and the first current weight may be a value greater than the second current weight.

[0306] The above at least one processor (91) can, if the color difference value between adjacent image blocks (IB) among the plurality of image blocks is less than or equal to a preset value, increase the current weight of the red LED (190R) of the corresponding dimming block (200) corresponding to the image block (IB) above the default value, decrease the current weight of the green LED (190G) below the default value, and decrease the current weight of the blue LED (190B) below the default value.

[0307] If the color difference value between adjacent image blocks (IB) among the plurality of image blocks is less than or equal to a preset value, the reduction ratio of the current weight of the blue LED (190B) may be lower than the reduction ratio of the current weight of the green LED (190G).

[0308] The above at least one processor (91) can, when the color difference value between adjacent image blocks (IB) among the plurality of image blocks exceeds a preset value, maintain the current weight of the red LED (190R) of the corresponding dimming block (200) corresponding to the image block (IB) at the default value, lower the current weight of the green LED (190G) below the default value, and lower the current weight of the blue LED (190B) below the default value.

[0309] The above at least one processor (91) can determine a current value of at least one of the red LED (190R), green LED (190G), and blue LED (190B) of the plurality of dimming blocks (200) based on the current weighting, and supply the determined at least one current value to at least one of the red LED (190R), green LED (190G), and blue LED (190B) of the plurality of dimming blocks (200) through Pulse Amplitude Modulation (PAM) control.

[0310] The above at least one processor (91) can determine the current weight of the green LED (190G) of the plurality of dimming blocks (200) to be higher than the current weight of the red LED (190R) and the blue LED (190B), based on the fact that the color blindness mode is a green blindness mode.

[0311] The above at least one processor (91) determines the current weight of the green LED (190G) of the corresponding dimming block (200) corresponding to the image block (IB) as a first current weight when the color difference value between adjacent image blocks (IB) among the plurality of image blocks is less than or equal to a preset value, and determines the current weight of the green LED (190G) as a second current weight when the color difference value exceeds the preset value, and the first current weight may be a value greater than the second current weight.

[0312] The above at least one processor (91) can, if the color difference value between adjacent image blocks (IB) among the plurality of image blocks is less than or equal to a preset value, increase the current weight of the green LED (190G) of the corresponding dimming block (200) corresponding to the image block (IB) above the default value, decrease the current weight of the red LED (190R) below the default value, and decrease the current weight of the blue LED (190B) below the default value.

[0313] If the color difference value between adjacent image blocks (IB) among the plurality of image blocks is less than or equal to a preset value, the reduction ratio of the current weight of the blue LED (190B) may be lower than the reduction ratio of the current weight of the red LED (190R).

[0314] The above at least one processor (91) can, when the color difference value between adjacent image blocks (IB) among the plurality of image blocks exceeds a preset value, maintain the current weight of the green LED (190G) of the corresponding dimming block (200) corresponding to the image block (IB) at the default value, lower the current weight of the red LED (190R) below the default value, and lower the current weight of the blue LED (190B) below the default value.

[0315] A control method for a display device (10) according to one embodiment of the present disclosure may include, in a color blindness mode, obtaining a color difference value between a plurality of image blocks (IB) corresponding to a plurality of dimming blocks (200) based on image data; determining a current weight of at least one of a red LED (190R), a green LED (190G), and a blue LED (190B) of the plurality of dimming blocks (200) based on the color difference value between the plurality of image blocks (IB); and controlling a current supplied to at least one of the red LED (190R), a green LED (190G), and a blue LED (190B) of the plurality of dimming blocks (200) based on the image data and the current weight.

[0316] Acquiring the color difference value may include acquiring color data of pixels included in the plurality of image blocks (IB), determining the average color value of each of the plurality of image blocks (IB), and determining the color difference value between adjacent image blocks (IB) by comparing the average color values ​​of adjacent image blocks (IB) among the plurality of image blocks (IB).

[0317] Meanwhile, embodiments of the present disclosure may be implemented in the form of a storage medium that stores instructions executable by a computer. The instructions may be stored in the form of program code, and when executed by at least one processor, at least one processor may perform the operation of the embodiments of the present disclosure.

[0318] 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.

[0319] 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.

[0320] According to one embodiment, the method according to the various embodiments disclosed herein may be provided by being 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 storage 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 storage medium, such as the memory of a manufacturer's server, an application store's server, or a relay server.

[0321] Although non-limiting exemplary embodiments of the present disclosure have been described with reference to the accompanying drawings, those skilled in the art will understand that embodiments of the present disclosure may be implemented in different forms without departing from the scope and spirit of the present disclosure and should not be interpreted as being limited to the exemplary embodiments presented herein.

Claims

1. Image display unit; A backlight unit that provides light to the above-mentioned image display unit; and At least one processor configured to enable the display device to display an image by controlling the image display unit and the backlight unit; The above backlight unit is, Substrate; and A plurality of dimming blocks arranged in a plurality of rows and a plurality of columns on the substrate, each comprising a red LED, a green LED, and a blue LED; In colorblind mode, the above-mentioned at least one processor, Based on image data, color difference values ​​between a plurality of image blocks of the image corresponding to the plurality of dimming blocks are obtained, and Based on the color difference values ​​between the plurality of image blocks, at least one of the current weight of a red LED of one of the plurality of dimming blocks, the current weight of a green LED of the dimming block, and the current weight of a blue LED of the dimming block is determined. A display device that controls the current supplied to at least one of the red LED of the dimming block, the green LED of the dimming block, and the blue LED of the dimming block based on the above image data and the above determined current weight.

2. In Paragraph 1, The color difference value obtained by the above at least one processor is the color difference between the plurality of image blocks, and The above-mentioned at least one processor is, Based on the color data of the pixels included in the adjacent image blocks, the average color value of each of the adjacent image blocks is determined, and A display device that determines a color difference value between adjacent image blocks by comparing the average color values ​​of the adjacent image blocks.

3. In Paragraph 1, The above-mentioned at least one processor is, A display device that, based on the fact that the above colorblind mode is a red-blind mode, makes the current weight of the red LED higher than the current weight of the green LED and the current weight of the blue LED.

4. In Paragraph 3, The color difference value obtained by the above at least one processor is a color difference value between a first image block and a second image block adjacent to the first image block, and The above-mentioned at least one processor is, Based on the fact that the color difference value between the first image block and the second image block is less than or equal to a preset value, the current weight of the red LED of the dimming block is determined as the first current weight, and the dimming block corresponds to the first image block, and Based on the fact that the above color difference value exceeds the above preset value, the current weight of the red LED is determined as the second current weight, and A display device in which the first current weight is greater than the second current weight.

5. In Paragraph 3, The color difference value obtained by the above at least one processor is a color difference value between a first image block and a second image block adjacent to the first image block, and The above-mentioned at least one processor is, Based on the fact that the color difference value between the first image block and the second image block is less than or equal to a preset value, the current weight of the red LED of the dimming block is increased above the default value, and the current weight of the green LED of the dimming block and the current weight of the blue LED of the dimming block are decreased below the default value. The above dimming block is a display device corresponding to the above first image block.

6. In Paragraph 5, The above-mentioned at least one processor is, A display device that makes the current weight of the green LED of the dimming block lower than the current weight of the blue LED of the dimming block, based on the fact that the color difference value between the first image block and the second image block is less than or equal to the preset value.

7. In Paragraph 3, The color difference value obtained by the above at least one processor is a color difference value between a first image block and a second image block adjacent to the first image block, and The above-mentioned at least one processor is, Based on the fact that the color difference value between the first image block and the second image block exceeds a preset value, the current weight of the red LED of the dimming block is maintained at a default value, and the current weight of the green LED of the dimming block and the current weight of the blue LED of the dimming block are lowered below the default value. The above dimming block is a display device corresponding to the above first image block.

8. In Paragraph 1, The above-mentioned at least one processor is, Based on the above image data and the determined current weighting factor, a current value of at least one of the red LED of the dimming block, the green LED of the dimming block, and the blue LED of the dimming block is determined, and A display device that supplies the current value to at least one of the red LED, the green LED, and the blue LED through PAM (Pulse Amplitude Modulation) control.

9. In Paragraph 1, The above-mentioned at least one processor is, A display device that, based on the fact that the above colorblind mode is a green blind mode, makes the current weight of the green LED greater than the current weight of the red LED and the current weight of the blue LED.

10. In Paragraph 9, The color difference value obtained by the above at least one processor is a color difference value between a first image block and a second image block adjacent to the first image block, and The above-mentioned at least one processor is, Based on the fact that the color difference value between the first image block and the second image block is less than or equal to a preset value, the current weight of the green LED of the dimming block is determined as the first current weight, and the dimming block corresponds to the first image block, and Based on the fact that the above color difference value exceeds the above preset value, the current weight of the green LED is determined as the second current weight, and A display device in which the first current weight is greater than the second current weight.

11. In Paragraph 9, The color difference value obtained by the above at least one processor is a color difference value between a first image block and a second image block adjacent to the first image block, and The above-mentioned at least one processor is, Based on the fact that the color difference value between the first image block and the second image block is less than or equal to a preset value, the current weight of the green LED of the dimming block is increased above the default value, and the current weight of the red LED of the dimming block and the current weight of the blue LED of the dimming block are decreased below the default value. The above dimming block is a display device corresponding to the above first image block.

12. In Paragraph 11, The above-mentioned at least one processor is, A display device that makes the current weight of the red LED of the dimming block lower than the current weight of the blue LED of the dimming block, based on the fact that the color difference value between the first image block and the second image block is less than or equal to the preset value.

13. In Paragraph 9, The color difference value obtained by the above at least one processor is a color difference value between a first image block and a second image block adjacent to the first image block, and The above-mentioned at least one processor is, Based on the fact that the color difference value between the first image block and the second image block exceeds a preset value, the current weight of the green LED of the dimming block is maintained at a default value, and the current weight of the red LED of the dimming block and the current weight of the blue LED of the dimming block are lowered below the default value. The above dimming block is a display device corresponding to the above first image block.

14. A method for controlling a display device that displays an image, In a colorblind mode, a step of obtaining color difference values ​​between a plurality of image blocks of the image based on image data, wherein the plurality of image blocks correspond to a plurality of dimming blocks of the display device; Based on the color difference values ​​between the plurality of image blocks, a step of determining at least one of the current weight of a red LED of one of the plurality of dimming blocks, the current weight of a green LED of the dimming block, and the current weight of a blue LED of the dimming block; and A method for controlling a display device, comprising the step of controlling a current supplied to at least one of a red LED of a dimming block, a green LED of a dimming block, and a blue LED of a dimming block, based on the image data and the determined current weight.

15. In Paragraph 14, The color difference value obtained above is the color difference value between adjacent image blocks among the plurality of image blocks, and Obtaining the above color difference value is, A step of obtaining color data of pixels included in the above adjacent image blocks; A step of determining the average color value of each of the above adjacent image blocks; and A control method for a display device comprising the step of determining a color difference value between adjacent image blocks by comparing the average color values ​​of the adjacent image blocks.

Images