Display apparatus

Abstract

A display apparatus according to one aspect of the disclosed invention comprises: a liquid crystal panel; a backlight unit providing light to the liquid crystal panel; and at least one processor controlling the liquid crystal panel and the backlight unit. The backlight unit comprises: a substrate; a plurality of dimming blocks arranged on the substrate in a plurality of rows and a plurality of columns and each including a plurality of light-emitting elements; and a plurality of driving elements driving the plurality of dimming blocks, wherein each of the plurality of light-emitting elements includes a red LED, a green LED, and a blue LED, and the at least one processor can control the plurality of driving elements to adjust a current value supplied to at least one of the red LED, the green LED, or the blue LED according to an image mode.

Description

display device

[0001] The disclosed invention relates to a display device, and more particularly, to a display device including a liquid crystal panel and a back light unit (BLU).

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

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

[0004] Among these, local dimming technology in the backlight unit of an LED TV is a key technology for improving the display's contrast ratio. A local dimming system divides the display screen into multiple zones, independently controlling the current for each zone based on the input image. Consequently, current is reduced when the input image is dark, and increased when the input image is bright, effectively improving the contrast ratio.

[0005] One aspect of the disclosed invention provides a display device capable of reducing power consumption by adjusting a current value supplied to at least one of a red LED, a green LED, and a blue LED included in a backlight unit according to an image mode.

[0006] The technical problems to be achieved in this document are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary skill in the technical field to which the present invention belongs from the description below.

[0007] A display device according to one aspect of the disclosed invention comprises: a liquid crystal panel; a backlight unit that provides light to the liquid crystal panel; and at least one processor that controls the liquid crystal panel and the backlight unit, wherein the backlight unit comprises: a substrate; a plurality of dimming blocks arranged in a plurality of rows and a plurality of columns on the substrate, each dimming block including a plurality of light-emitting elements; and a plurality of driving elements that drive the plurality of dimming blocks, wherein each of the plurality of light-emitting elements includes a red LED, a green LED, and a blue LED, and wherein the at least one processor can control the plurality of driving elements to adjust a current value supplied to at least one of the red LED, the green LED, and the blue LED according to an image mode.

[0008] FIG. 1 illustrates an example of the appearance of a display device according to one embodiment.

[0009] FIG. 2 illustrates an example of the structure of a display device according to one embodiment.

[0010] FIG. 3 illustrates an example of a liquid crystal panel included in a display device according to one embodiment.

[0011] FIG. 4 illustrates an example of a back light unit (BLU) included in a display device according to one embodiment.

[0012] FIG. 5 is a drawing for explaining that a plurality of light-emitting diodes of a backlight unit according to one embodiment are divided into dimming blocks.

[0013] FIG. 6 illustrates an example of a display device according to one embodiment converting dimming data from image data.

[0014] FIG. 7 is a drawing showing a control block diagram of a display device according to one embodiment.

[0015] FIG. 8 illustrates an example of a light-emitting element included in a backlight unit according to one embodiment.

[0016] Figure 9 is a drawing for explaining image output using a conventional single light.

[0017] FIG. 10 is a drawing for explaining image output using a backlight unit including LEDs of multiple colors according to one embodiment.

[0018] FIG. 11 is a diagram showing adjusting the maximum current value according to the image mode according to one embodiment.

[0019] Fig. 12 is a drawing for explaining 10-bit division in a state where the maximum current value is adjusted according to one embodiment.

[0020] Figure 13 is a drawing for explaining the process of performing conventional local dimming.

[0021] Fig. 14 is a diagram for explaining a process of performing local dimming according to one embodiment.

[0022] FIG. 15 is a diagram for comparing an operation of performing local dimming according to one embodiment.

[0023] Fig. 16 is a flowchart showing a process in which a display device performs local dimming according to one embodiment.

[0024] FIG. 17 is a drawing for explaining selecting an image mode according to one embodiment.

[0025] FIG. 18 is a drawing for explaining automatic changing of the image mode according to one embodiment.

[0026] Fig. 19 is a flowchart showing a process for automatically changing the image mode according to one embodiment.

[0027] FIGS. 20 and 21 illustrate the arrangement of a dimming driver, a driving element, and a light-emitting element included in a display device according to one embodiment.

[0028] Fig. 22 is a drawing for explaining the driving current wiring of the driving element of the backlight unit according to one embodiment.

[0029] FIG. 23 is a drawing illustrating a substrate and bottom chassis of a display device according to one embodiment.

[0030] FIG. 24 is an enlarged view of a portion of a substrate and bottom chassis of a display device according to one embodiment.

[0031] The embodiments described in this specification and the configurations illustrated in the drawings are merely preferred examples of the disclosed invention, and there may be various modified examples that can replace the embodiments and drawings of this specification at the time of filing of this application.

[0032] Additionally, the same reference numbers or symbols presented in each drawing of this specification represent parts or components that perform substantially the same function.

[0033] In addition, the terminology used in this specification is used to describe embodiments and is not intended to limit and / or restrict the disclosed invention. The singular expression includes plural expressions unless the context clearly indicates otherwise. In this specification, the terms "comprises" or "has" and the like are intended to specify the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0034] Additionally, in this specification, when it is said that a configuration is “connected” or “coupled” with another configuration, this includes not only cases where it is directly connected or coupled, but also cases where it is indirectly connected or coupled.

[0035] Additionally, terms including ordinal numbers such as “first,” “second,” etc. used herein may be used to describe various components, but the components are not limited by the terms, and the terms are used only 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 referred to as the second component, and similarly, the second component may also be referred to as the first component. The term “and / or” includes any combination of a plurality of related listed items or any item among a plurality of related listed items.

[0036] Hereinafter, an embodiment according to the present invention will be described with reference to the attached drawings.

[0037] FIG. 1 illustrates an example of the appearance of a display device according to one embodiment.

[0038] Referring to FIG. 1, a display device (10) is a device that processes an image signal received from the outside and can visually display the processed image. Hereinafter, 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 an image.

[0039] In addition, the display device (10) may be a large format display (LFD) installed outdoors, such as on a building rooftop or a bus stop. Here, the outdoors is not necessarily limited to outdoors, and the display device (10) according to one embodiment may be installed in any indoor location where a large number of people may enter and exit, such as a subway station, shopping mall, movie theater, company, or store.

[0040] The display device (10) can receive content including video signals and audio signals from various content sources, and output video and audio corresponding to the video signals and audio signals. For example, the display device (10) can receive content data via a broadcast reception 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.

[0041] As illustrated in FIG. 1, the display device (10) may include a main body (11) and a screen (12) that displays an image (I).

[0042] The main body (11) forms the outer shape of the display device (10), and components for displaying an image (I) or performing various functions may be provided inside the main body (11). The main body (11) illustrated in Fig. 1 has a flat plate shape, but the shape of the main body (11) is not limited to that illustrated in Fig. 1. For example, the main body (11) may have a curved plate shape.

[0043] The 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 moving image. In addition, 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.

[0044] The screen (12) may include a liquid crystal panel that can pass through or block light emitted by a back light unit (BLU), etc.

[0045] A plurality of pixels (P) are formed on the screen (12), and an image (I) displayed on the screen (12) can be formed by light emitted from each of the plurality of pixels (P). For example, an image (I) can be formed on the screen (12) by combining the light emitted from each of the plurality of pixels (P) like a mosaic.

[0046] Each of the plurality of pixels (P) can emit light of different brightness and different colors. To emit light of different colors, each of the plurality of pixels (P) can include sub-pixels (PR, PG, PB).

[0047] The subpixels (PR, PG, PB) may include a red subpixel (PR) capable of emitting red light, a green subpixel (PG) capable of emitting green light, and a blue subpixel (PB) capable of emitting blue light. For example, red light may represent light with a wavelength of approximately 700 nm (nanometer, one billionth of a meter) to 800 nm. Green light may represent light with a wavelength of approximately 500 nm to 600 nm. Blue light may represent light with a wavelength of approximately 400 nm to 500 nm.

[0048] By combining the red light of the red subpixel (PR), the green light of the green subpixel (PG), and the blue light of the blue subpixel (PB), light of various brightness and colors can be emitted from each of the plurality of pixels (P).

[0049] FIG. 2 illustrates an example of the structure of a display device (10) according to one embodiment, and FIG. 3 illustrates an example of a liquid crystal panel included in a display device (10) according to one embodiment.

[0050] As shown in Fig. 2, various components for generating an image (I) on a screen (S) can be provided inside the main body (11).

[0051] 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) which blocks or passes light emitted from the back light unit (100), a control assembly (50) which controls the operation of the back light unit (100) and the liquid crystal panel (20), and a power assembly (60) which supplies power to the back light unit (100) and the liquid crystal panel (20). In addition, 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).

[0052] The backlight unit (100) may include a point light source that emits white light. In addition, the backlight unit (100) may refract, reflect, and scatter light to convert the light emitted from the point light source into a uniform surface light. In this way, the backlight unit (100) may emit a uniform surface light toward the front by refracting, reflecting, and scattering the light emitted from the point light source.

[0053] The backlight unit (100) is described in more detail below.

[0054] The liquid crystal panel (20) 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).

[0055] The front surface of the liquid crystal panel (20) forms the screen (S) 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 independently block or transmit light from the backlight unit (100). In addition, light transmitted by the plurality of pixels (P) can form an image (I) displayed on the screen (S).

[0056] For example, as illustrated 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).

[0057] 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). The first and second transparent substrates (22, 28) can be made of reinforced glass or transparent resin.

[0058] A first polarizing film (21) and a second polarizing film (29) are provided on the outer sides of the first and second transparent substrates (22, 28). The first polarizing film (21) and the second polarizing film (29) can each transmit a specific polarization and block (reflect or absorb) other polarizations. For example, the first polarizing film (21) can transmit polarization in a first direction and block (reflect or absorb) other polarizations. In addition, the second polarizing film (29) can transmit polarization in a second direction and block (reflect or absorb) other polarizations. At this time, the first direction and the second direction can be orthogonal to each other. Therefore, polarizations that pass through the first polarizing film (21) cannot directly pass through the second polarizing film (29).

[0059] The 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 transmits red light, a green filter (27G) that transmits green light, and a blue filter (27B) that transmits blue light. In addition, the red filter (27R), the green filter (27G), and the blue filter (27B) may be arranged parallel to each other. 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).

[0060] 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 a metal material that conducts electricity, and can generate an electric field for changing the arrangement of liquid crystal molecules (115a) that constitute the liquid crystal layer (25) to be described below.

[0061] 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) according to image data provided from the panel driver (30). In addition, an electric field can be formed or removed between the pixel electrode (23) and the common electrode (26) depending on the turning on (closed) or turning off (open) of the thin film transistor (24).

[0062] 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 can exhibit an intermediate state between a solid (crystal) and a liquid. The liquid crystal can exhibit optical properties according to changes in the electric field. For example, the direction of the arrangement of molecules constituting the liquid crystal can change according to changes in the electric field. Therefore, the optical properties of the liquid crystal layer (25) can vary depending on the presence or absence of an electric field passing through the liquid crystal layer (25). For example, the liquid crystal layer (25) can rotate the polarization direction of light around the optical axis depending on the presence or absence of an electric field. Accordingly, the polarized light passing through the first polarizing film (21) rotates its polarization direction while passing through the liquid crystal layer (25) and can pass through the second polarizing film (29).

[0063] On one side of the liquid crystal panel (20), a cable (20a) for transmitting image data to the liquid crystal panel (20) and a display driver integrated circuit (DDI) (30) (hereinafter referred to as a 'panel driver') for processing digital image data and outputting an analog image signal are provided.

[0064] The cable (20a) electrically connects between the control assembly (50) / power assembly (60) and the panel driver (30), and can also electrically connect between the panel driver (30) and the liquid crystal panel (20). The cable (20a) may include a flexible flat cable or a film cable that can be bent.

[0065] The panel driver (30) can receive image data and power from the control assembly (50) / power assembly (60) via the cable (20a). In addition, the panel driver (30) can provide image data and driving current to the liquid crystal panel (20) via the cable (20a).

[0066] In addition, the cable (20a) and the panel driver (30) may be implemented as a single unit, such as a film cable, a chip on film (COF), a tape carrier packet (TCP), etc. In other words, the panel driver (30) may be placed on the cable (20b). However, this is not limited thereto, and the panel driver (30) may be placed on the liquid crystal panel (20).

[0067] 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 a video signal and / or an audio signal received from an external content source. The control circuit may transmit image data to the liquid crystal panel (20) and dimming data to the backlight unit (100).

[0068] 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).

[0069] The control assembly (50) and the power assembly (60) may be implemented as printed circuit boards and various circuits mounted on the printed circuit board. For example, the power circuit may include capacitors, coils, resistors, processors, etc., and a power circuit board on which these are mounted. In addition, the control circuit may include memory, a processor, and a control circuit board on which these are mounted.

[0070] FIG. 4 illustrates an example of a backlight unit (100) included in a display device (10) according to one embodiment, and FIG. 5 is a drawing for explaining that a plurality of light-emitting diodes of the backlight unit (100) according to one embodiment are divided into dimming blocks.

[0071] As illustrated in FIG. 4, the backlight unit (100) may include a light source module (110) that generates light, a reflective sheet (120) that reflects light, a diffuser plate (130) that uniformly diffuses light, and an optical sheet (140) that improves the brightness of the emitted light.

[0072] 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).

[0073] A plurality of light-emitting elements (111) may be arranged in a predetermined pattern so that light is emitted with uniform brightness. The plurality of light-emitting elements (111) may be arranged so that the distance between one light source and adjacent light sources is the same.

[0074] For example, as illustrated in FIG. 4, a plurality of light-emitting elements (111) may be arranged in rows and columns. For example, a plurality of light sources may be arranged so that an approximately square is formed by four adjacent light sources. In addition, one light source may be arranged adjacent to four light sources, and the distance between one light source and the four adjacent light sources may be approximately the same.

[0075] Additionally, depending on the embodiment, multiple light sources may be arranged such that three adjacent light sources form an approximately equilateral triangle. In this case, one light source may be arranged adjacent to six light sources. Furthermore, the distance between one light source and the six adjacent light sources may be approximately equal.

[0076] 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.

[0077] The light-emitting element (111) may employ an element that can emit monochromatic light (light of a specific wavelength, for example, blue light) or white light (for example, light mixed with red light, green light, and blue light) in various directions when power is supplied. For example, the light-emitting element (111) may include a light-emitting diode (LED). The light-emitting diode may be implemented in various sizes, and may include, for example, a mini LED and / or a micro LED.

[0078] The substrate (112) can fix a plurality of light emitting elements (111) so that the positions of the light emitting elements (111) do not change. In addition, the substrate (112) can supply power to each light emitting element (111) for emitting light.

[0079] The substrate (112) may include a synthetic resin and / or reinforced glass and / or a printed circuit board (PCB) that fixes a plurality of light-emitting elements (111) and has conductive power supply lines formed thereon for supplying power to the light-emitting elements (111).

[0080] Additionally, the substrate (112) may include a plurality of sub-substrates (112').

[0081] 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 direction.

[0082] 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). In addition, the light-emitting elements (111) of the light source module (110) can pass through the through holes (120a) and protrude forward of the reflective sheet (120).

[0083] 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). Therefore, the substrate (112) of the light source module (110) is positioned at the rear of the reflective sheet (120), but the plurality of light emitting elements (111) of the light source module (110) can be positioned at the front of the reflective sheet (120).

[0084] By this, a plurality of light emitting elements (111) can emit light in front of the reflective sheet (120).

[0085] A plurality of light-emitting elements (111) can emit light in various directions in front of the reflective sheet (120). Light can be emitted from the light-emitting elements (111) toward the diffusion 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 diffusion plate (130).

[0086] Light emitted from the light emitting element (111) passes through various objects such as a diffuser plate (130) and an optical sheet (140). When the light passes through the diffuser plate (130) and the optical sheet (140), some of the incident light is reflected from the surfaces of the diffuser plate (130) and the optical sheet (140). The reflective sheet (120) can reflect the light reflected by the diffuser plate (130) and the optical sheet (140).

[0087] A diffusion 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).

[0088] As described above, a plurality of light-emitting elements (111) are positioned at various locations on the rear of the backlight unit (100). Although the plurality of light-emitting elements (111) are positioned at equal intervals on the rear of the backlight unit (100), unevenness in brightness may occur depending on the locations of the plurality of light-emitting elements (111).

[0089] The diffuser plate (130) can diffuse the light emitted from the plurality of light-emitting elements (111) within the diffuser plate (130) to eliminate the unevenness of brightness caused by the plurality of light-emitting elements (111). In other words, the diffuser plate (130) can uniformly emit the uneven light of the plurality of light-emitting elements (111) to the front.

[0090] 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.

[0091] The diffusion sheet (141) diffuses light to ensure uniformity of 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).

[0092] 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 prism patterns in the shape of triangular prisms, and a plurality of these prism patterns are arranged adjacently to form a plurality of band shapes.

[0093] The reflective polarizing sheet (144) is a type of polarizing film that can transmit some of the incident light and reflect the other part to improve brightness. For example, it can transmit polarized light having the same direction as the predetermined polarization direction of the reflective polarizing sheet (144) and reflect polarized light having a different direction from the polarization direction of the reflective polarizing sheet (144). In addition, the light reflected by the reflective polarizing sheet (144) is recycled within the backlight unit (100), and the brightness of the display device (10) can be improved by this light recycling.

[0094] The optical sheet (140) is not limited to the sheet or film illustrated in FIG. 4, and may include a wider variety of sheets or films, such as a protective sheet.

[0095] 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 to allow each of the plurality of pixels to pass light or block light. An image can be formed by light passing through each of the plurality of pixels.

[0096] At this time, the display device (10) can perform local dimming to vary the brightness of light in each area of ​​the backlight unit (100) in conjunction with the output image so as to improve power consumption while increasing the contrast ratio.

[0097] For example, the display device (10) can reduce the brightness of the light of the light emitting element (111) of the backlight unit (100) corresponding to the dark portion of the image in order to darken the dark portion of the image, and can increase the brightness of the light of the light emitting element (111) of the backlight unit (100) corresponding to the bright portion of the image in order to brighten the bright portion of the image. As a result, the contrast ratio or brightness ratio of the image can be improved.

[0098] The display device (10) divides the backlight unit (100) into a plurality of blocks, and independently controls the current for each block according to the input image. The image transmission of the display device (10) is performed through a method of local dimming operation for each frame, and the current operation is controlled according to the number of blocks of light-emitting elements (111) divided within the backlight unit (100).

[0099] 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.

[0100] For local dimming, the plurality of light-emitting elements (111) included in the backlight unit (100) may be divided into a plurality of dimming blocks (200). For example, the plurality of dimming blocks (200) may be arranged in 5 rows and 12 columns, for a total of 60, as illustrated in FIG. 5. As another example, the plurality of dimming blocks (200) may be arranged in 5 rows and 4 columns, for a total of 20. However, the number of dimming blocks (200) is not limited to the above example.

[0101] 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.

[0102] In addition, 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.

[0103] Each of the plurality of dimming blocks (200) may include, for example, N*M light sources arranged in an N*M matrix form (N and M are natural numbers). An N*M matrix means a matrix having N rows and M columns.

[0104] Since each light-emitting element (111) includes a light-emitting diode, each of the plurality of dimming blocks (200) can include N*M light-emitting diodes. That is, each of the plurality of dimming blocks (200) can include a predetermined number of light-emitting elements (111).

[0105] A plurality of dimming blocks (200) may be arranged on the substrate (112). That is, N*M light-emitting diodes may be arranged on the substrate (112). Alternatively, a plurality of dimming blocks (200) may be provided on each of a plurality of sub-substrates (112') included in the substrate (112).

[0106] FIG. 6 is a drawing showing a control block diagram of a display device according to one embodiment, and FIG. 7 shows an example of a display device according to one embodiment converting dimming data from image data.

[0107] 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 disposed on the upper surface of the substrate (112) or on the lower surface of the substrate (112).

[0108] The content receiving unit (80) may include a receiving terminal (81) and a tuner (82) that receive content including video signals and / or audio signals from content sources.

[0109] The receiving terminal (81) can receive video signals and audio signals from content sources via a cable. For example, the receiving terminal (81) can include a component (YPbPr / RGB) terminal, a composite video blanking and sync (CVBS) terminal, an audio terminal, a High Definition Multimedia Interface (HDMI) terminal, a Universal Serial Bus (USB) terminal, etc.

[0110] The tuner (82) can receive broadcast signals from a broadcast reception antenna or a wired cable, and extract broadcast signals of a channel selected by the user from among the broadcast signals. For example, the tuner (82) can pass broadcast signals having a frequency corresponding to a channel selected by the user from among a plurality of broadcast signals received through a broadcast reception antenna or a wired cable, and block broadcast signals having other frequencies.

[0111] In this way, the content receiving unit (80) can receive images including video signals and audio signals from content sources through the receiving terminal (81) and / or the tuner (82), and can output the input images input through the receiving terminal (81) and / or the tuner (82) to the image processing unit (90).

[0112] The image processing unit (90) may include at least one processor (91) that processes an input image (image data) and a memory (92) that stores / remembers data.

[0113] The memory (92) stores programs and data for processing video signals and / or audio signals, and can temporarily store data generated during processing of the video signals and / or audio signals.

[0114] 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).

[0115] At least one processor (91) can receive an input image including a video signal and / or an audio signal from a content receiving unit (80), decode the video signal into image data, and generate dimming data from the image data. The image data and dimming data can be output to the panel driver (30) and the dimming driver (170), respectively.

[0116] At least one processor (91) can provide dimming data for local dimming to the backlight unit (100). The dimming data can include information about the brightness of each of the plurality of dimming blocks (200). For example, the dimming data can include information about the intensity of light output by the light-emitting elements (111) included in each of the plurality of dimming blocks (200). That is, the dimming data can include information about the magnitude of current supplied to the light-emitting elements (111) included in each of the plurality of dimming blocks (200).

[0117] At least one processor (91) can obtain dimming data from image data decoded from a video signal.

[0118] The processor (91) can convert image data into dimming data in various ways. For example, as illustrated in FIG. 7, the processor (91) can divide an image (I) by 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 a plurality of dimming blocks (200).

[0119] The processor (91) can obtain the luminance values ​​(L) of the plurality of dimming blocks (200) from the image data of the plurality of image blocks (IB). In addition, the processor (91) can generate dimming data by combining the luminance values ​​(L) of the plurality of dimming blocks (200).

[0120] For example, the processor (91) can obtain the luminance value (L) of each of the plurality of dimming blocks (200) based on the maximum value among the luminance values ​​of the pixels included in each of the image blocks (IB).

[0121] One image block includes a plurality of pixels, and the image data of one image block may include image data of a plurality of pixels (e.g., red data, green data, blue data, etc.). The processor (91) may calculate a luminance value of each pixel based on the image data of each pixel.

[0122] The processor (91) can set the maximum value among the luminance values ​​of each pixel included in the image block as the luminance value of the dimming block corresponding to the image block. For example, the processor (91) can set the maximum value among the luminance values ​​of the pixels included in the ith image block (IB(i)) as the luminance value (L(i)) of the ith dimming block, and can set the maximum value among the luminance values ​​of the pixels included in the jth image block (IB(j)) as the luminance value (L(j)) of the jth dimming block.

[0123] The processor (91) can generate dimming data by combining the luminance values ​​of a plurality of dimming blocks (200).

[0124] In this way, the image processing unit (90) can decode the video signal acquired by the content receiving unit (80) into image data and generate dimming data from the image data. In addition, 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.

[0125] 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 shape. In other words, the plurality of pixels can be arranged in a plurality of rows and a plurality of columns.

[0126] The panel driver (30) can receive image data from the image processing unit (90) and drive the liquid crystal panel (20) according to the image data. In other words, the panel driver (30) can convert image data, which is a digital signal (hereinafter referred to as “digital image data”), into an analog image signal, which is an analog voltage signal, and provide the converted analog image signal to the liquid crystal panel (20). Depending on 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.

[0127] The panel driver (30) may include, for example, a timing controller, a data driver, a scan driver, etc.

[0128] The timing controller can receive image data from the image processing unit (90) and output the image data and a driving control signal to the data driver and the scan driver. The driving control signal can include a scan control signal and a data control signal, and the scan control signal and the data control signal can be used to control the operation of the scan driver and the operation of the data driver, respectively.

[0129] The scan driver receives a scan control signal from the timing controller, and can input-activate any 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 pixels included in any one of a plurality of pixels arranged in a plurality of rows and a plurality of columns into a state capable of receiving an analog image signal. At this time, pixels that are input-deactivated other than pixels that are input-activated by the scan driver cannot receive an analog image signal.

[0130] The data driver can receive image data and a data control signal from the timing controller, and 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. In addition, the data driver can provide an analog image signal to pixels included in any one row that is input-activated by the scan driver. At this time, the pixels that are 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.

[0131] In this way, the panel driver (30) can drive the liquid crystal panel (20) according to the image data. As a result, an image corresponding to the image data can be displayed on the liquid crystal panel (20).

[0132] 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 matrix shape. In other words, the plurality of light sources (111) may be arranged in a plurality of rows and a plurality of columns. In addition, the light source device (100) may be divided into a plurality of dimming blocks (200), and each of the plurality of dimming blocks (200) may include at least one light source.

[0133] The dimming driver (170) can receive dimming data from the image processing unit (90) and drive the light source device (100) according to the dimming data. Here, the dimming data can include information about the brightness of each of the plurality of dimming blocks (200) or information about the brightness of the light sources included in each of the plurality of dimming blocks (200).

[0134] The dimming driver (170) can convert dimming data, which is a digital signal (hereinafter referred to as “digital dimming data”), 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.

[0135] In particular, the dimming driver (170) may sequentially provide analog dimming signals to the plurality of dimming blocks (200) in an active matrix manner, rather than directly providing analog dimming signals to all of the plurality of dimming blocks (200).

[0136] As described above, a plurality of dimming blocks (200) may be arranged in a matrix form in the light source device (100). In other words, a plurality of dimming blocks (200) may be arranged in a plurality of rows and a plurality of columns in the light source device (100).

[0137] The dimming driver (170) can sequentially provide an analog dimming signal to dimming blocks belonging to each of a plurality of rows or sequentially provide an analog dimming signal to dimming blocks belonging to each of a plurality of columns.

[0138] For example, the dimming driver (170) can input-activate dimming blocks belonging to one row among the plurality of dimming blocks (200) and provide an analog dimming signal to the input-activated dimming blocks. Thereafter, the dimming driver (170) can input-activate dimming blocks belonging to another row among the plurality of dimming blocks (200) and provide an analog dimming signal to the input-activated dimming blocks.

[0139] FIG. 8 illustrates an example of a light-emitting element included in a backlight unit according to one embodiment, FIG. 9 is a drawing for explaining image output using a conventional single light, and FIG. 10 is a drawing for explaining image output using a backlight unit including LEDs of multiple colors according to one embodiment.

[0140] One light emitting element (111) may include one light emitting diode group (175). 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), as illustrated in FIG. 8.

[0141] A plurality of light-emitting diode groups (175) can be arranged in a two-dimensional matrix form on the upper surface of the substrate (112). That is, as illustrated in FIG. 4, as a plurality of light-emitting elements (111) are arranged in rows and columns, a plurality of light-emitting diode groups (175) can be arranged in a two-dimensional matrix form.

[0142] Additionally, depending on the embodiment, multiple light sources may be arranged such that three adjacent light sources form an approximately equilateral triangle. In this case, one light source may be arranged adjacent to six light sources. Furthermore, the distance between one light source and the six adjacent light sources may be approximately equal.

[0143] 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.

[0144] The light-emitting element (111) may employ an element that can emit white light (light having multiple peak wavelengths, for example, light mixed with red light, green light, and blue light) in various directions when power is supplied.

[0145] That is, one light-emitting element (111) can emit white light by including a red light-emitting diode (190R), a green light-emitting diode (190G), and a blue light-emitting diode (190B).

[0146] As illustrated in FIG. 8, each of the plurality of light-emitting elements (111) may include a light-emitting diode group (175) and an optical dome (180).

[0147] To make the display device (10) thinner, the thickness of the backlight unit (100) can also be made thinner. To make the backlight unit (100) thinner, each of the plurality of light-emitting elements (111) is made thinner and its structure is simplified.

[0148] Each light emitting diode included in the light emitting diode group (175) may include a P-type semiconductor and an N-type semiconductor for emitting light by recombination of holes and electrons. In addition, 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.

[0149] Each of the light emitting diodes (190R, 190G, 190B; 190) can be configured to convert electrical energy into light energy. Each of the light emitting diodes (190R, 190G, 190B; 190) can emit light having a maximum intensity at a predetermined wavelength based on the 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).

[0150] For example, a multilayer reflective structure in which a plurality of insulating films having different refractive indices are alternately laminated may be provided on the front surface of each of the light emitting diodes (190R, 190G, 190B; 190). For example, such a multilayer reflective structure may be configured as 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 laminated, and may mean an optical element that exhibits high reflectivity for light of a specific wavelength according to the principle of forming an optical path difference according to wavelength and inducing strong reflection in a specific frequency band.

[0151] Additionally, the light emitting diodes (190R, 190G, 190B; 190) of the light emitting diode group (175) may 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 a light emitting diode chip or light emitting diode die is directly attached to the substrate (112) without separate packaging.

[0152] The light emitting diode (190) can be manufactured as a flip chip type. The light emitting diode (190) of the flip chip type can be manufactured by directly fusing the electrode pattern of the semiconductor element to the substrate (112) without using an intermediate medium such as a metal lead (wire) or a ball grid array (BGA) when attaching the light emitting diode, which is a semiconductor element, to the substrate (112). In this way, since the metal lead (wire) or ball grid array is omitted, the light emitting element (111) including the light emitting diode (190) of the flip chip type can be miniaturized.

[0153] In the above, a flip-chip type light-emitting diode (190) directly bonded 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.

[0154] The optical dome (180) can cover the light-emitting diode group (175). That is, the optical dome (180) can cover the red light-emitting diode (190R), the green light-emitting diode (190G), and the blue light-emitting diode (190B) included in the light-emitting diode group (175).

[0155] The optical dome (180) refracts and mixes red light, green light, and blue light emitted from each of the red light-emitting diode (190R), green light-emitting diode (190G), and blue light-emitting diode (190B), thereby emitting white light.

[0156] In this way, the optical dome (180) can reduce the optical distance (OD) for converting a point light source into a surface light source by emitting white light by mixing red light, green light, and blue light, thereby reducing the distance at which white light is mixed compared to when the optical dome (180) is not present.

[0157] In addition, the optical dome (180) can prevent or suppress damage to the light-emitting diode (190) due to external mechanical action and / or damage to the light-emitting diode (190) due to chemical action.

[0158] The optical dome (180) may have, for example, a dome shape obtained by cutting a sphere with a plane that does not include its center, or a hemispherical shape obtained by cutting a sphere with a plane that includes its center. The vertical cross-section of the optical dome (180) may be, for example, a curved or semicircular shape.

[0159] The optical dome (180) may be composed of silicone or epoxy resin. For example, molten silicone or epoxy resin may be ejected onto a light-emitting diode (190) through a nozzle or the like, and the ejected silicone or epoxy resin may then be hardened, thereby forming the optical dome (180).

[0160] 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.

[0161] 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).

[0162] In this way, the optical dome (180) can not only protect the light emitting diode (190) from external mechanical action and / or chemical action or electrical action, but also disperse the light emitted from the light emitting diode (190).

[0163] In the above, 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 the light-emitting diode.

[0164] In this way, the present invention has a light emitting element (111) including a red light emitting diode (190R), a green light emitting diode (190G), and a blue light emitting diode (190B), thereby achieving higher color purity and contrast ratio and higher image quality than local dimming using a single light in the local dimming operation described below.

[0165] That is, as shown in Fig. 9, a backlight unit including only a blue light-emitting diode and a display including a QD (Quantum Dot) sheet can be used to achieve higher color purity and contrast ratio, and higher picture quality, by using a backlight unit including a red light-emitting diode (190R), a green light-emitting diode (190G), and a blue light-emitting diode (190B), as shown in Fig. 10, rather than a display including a QD (Quantum Dot) sheet. In this case, the QD (Quantum Dot) sheet may not be included in the configuration of the display device.

[0166] Hereinafter, the overall local dimming operation in a backlight unit (100) including a light-emitting element (111) including a red light-emitting diode (190R), a green light-emitting diode (190G), and a blue light-emitting diode (190B) will be described.

[0167] FIG. 11 is a drawing showing adjustment of the maximum current value according to the image mode according to one embodiment, and FIG. 12 is a drawing for explaining 10-bit division in a state where the maximum current value is adjusted according to one embodiment.

[0168] At least one processor (91) can control a plurality of driving elements to adjust the current values ​​supplied to the red LED (190R), the green LED (190G), and the blue LED (190B) as the image mode changes.

[0169] That is, at least one processor (91) can control a plurality of driving elements to reduce the current values ​​supplied to the red LED (190R), the green LED (190G), and the blue LED (190B) as the image mode changes. This may include reducing the maximum current values ​​supplied to the red LED (190R), the green LED (190G), and the blue LED (190B).

[0170] A video mode can be a mode that allows for greater immersion in a video by controlling the RGB color gradation depending on the type of video. For example, video modes can include Standard Mode, Dynamic Mode, and Movie Mode. Video modes are not limited to these and can include a wider variety of modes.

[0171] Standard Mode may be a general viewing mode, Dynamic Mode may be a suitable mode for watching dynamic images such as sports, and Movie Mode may be a suitable mode for watching movies.

[0172] At least one processor (91) can reduce the current value of the red LED (190R) when the image mode is changed to Dynamic Mode. Accordingly, the light amount of the green LED (190G) and the blue LED (190B) is relatively increased, so that an image with a color tone appropriate for viewing dynamic images such as sports can be expressed.

[0173] At least one processor (91) can reduce the current values ​​of the green LED (190G) and the blue LED (190B) when the video mode is changed to Movie Mode. Accordingly, the light amount of the red LED (190R) is relatively increased, so that an image with a color appropriate for watching a movie or other image can be expressed.

[0174] In this way, by reducing the current value supplied to the light emitting element (111) of the backlight unit (100), the power consumed can be reduced.

[0175] Control to reduce the current value supplied to such light-emitting elements can be performed through PAM (Pulse Amplitude Modulation) control. PAM control adjusts the brightness of light from light-emitting elements by outputting different current intensities according to image data. In addition, such PAM control can be performed through global dimming control to reduce the current value supplied to light-emitting elements of all of the plurality of dimming blocks (200) included in the backlight unit (100).

[0176] At least one processor (91) can perform 10-bit division on the reduced current value after reducing the current value supplied to the light-emitting element (111).

[0177] That is, for example, in Dynamic Mode, the current value of the red LED (190R), which was previously a maximum of 30 [mA] as shown in (a) of Fig. 12, can be reduced to 24 [mA] as shown in (b) of Fig. 12.

[0178] At this time, in order to prevent image quality degradation, the current value of the red LED (190R), which has been reduced to 24 [mA], can be divided into 10 bits as before. Accordingly, image quality can be maintained even if the current value supplied to the LED is reduced as the image mode changes.

[0179] Fig. 13 is a drawing for explaining a process for performing conventional local dimming, and Fig. 14 is a drawing for explaining a process for performing local dimming according to one embodiment.

[0180] As described above, in the case of the present invention, power consumption can be reduced by reducing the current value supplied to an LED of a specific color in the process of emitting light from the backlight unit (100) in a specific image mode.

[0181] Referring to Fig. 13, previously, a light-emitting element (111) was turned on with maximum brightness in a backlight unit (100), and then brightness was controlled by performing PWM (Pulse Width Modulation) control or adjusting the brightness of each pixel in a liquid crystal panel. PWM control is a method of controlling the brightness of light from a light-emitting element by controlling the on time of a switch according to image data and thereby varying the time of current applied to the light-emitting element.

[0182] The present invention reduces the current value supplied to at least one of a red LED (190R), a green LED (190G), and a blue LED (190B) based on a change in the image mode as shown in FIG. 14, and then adjusts the brightness through PWM control and brightness control in a liquid crystal panel, similar to the prior art.

[0183] In this way, by reducing the current value supplied to at least one of the red LED (190R), green LED (190G), and blue LED (190B) depending on the image mode, the power consumption can be reduced, and higher color purity, contrast ratio, and image quality can be realized through more detailed control.

[0184] At least one processor (91) can control a plurality of driving elements (300) to supply current corresponding to the reduced current value to the entire plurality of dimming blocks (200) based on image information after the current value reduction control. This control can also be performed through the aforementioned PAM control.

[0185] Thereafter, at least one processor (91) can control the driving element (300) to supply current corresponding to the image information to each of the plurality of dimming blocks (200) based on the image information. This can be performed through the PWM control described above.

[0186] FIG. 15 is a diagram for comparing an operation of performing local dimming according to one embodiment, and FIG. 16 is a flowchart showing a process of performing local dimming by a display device according to one embodiment.

[0187] The display device (10) may further include an input unit (not shown) for receiving user input. When an image mode is selected (1601) by a user selection input received through the input unit, at least one processor (91) may adjust the current value supplied to each color LED according to the image mode (1603).

[0188] Thereafter, at least one processor (91) performs 10-bit division based on the adjusted current value (1605), and then performs PWM control for each of the plurality of dimming blocks based on the image information to adjust the brightness (1607).

[0189] As shown in (a) of Fig. 15, previously, light was emitted from a single-light backlight unit (100) and brightness was controlled by performing PAM control and PWM control based on received image data.

[0190] The present invention performs PAM control to reduce the current value supplied to at least one of a red LED (190R), a green LED (190G), and a blue LED (190B) by considering not only image data but also a selection input of an image mode as shown in (b) of FIG. 15, and then performs PWM control for each LED to adjust brightness.

[0191] Below we explain how these video modes change.

[0192] FIG. 17 is a drawing for explaining selecting an image mode according to one embodiment, FIG. 18 is a drawing for explaining automatically changing an image mode according to one embodiment, and FIG. 19 is a flowchart showing a process for automatically changing an image mode according to one embodiment.

[0193] As described above, the display device (10) may further include an input unit (not shown) for receiving user input. The user may input a user command to the input unit through an external device such as a remote control or a separate operating unit provided on the display device (10).

[0194] At least one processor (91) can change the image mode based on user input received through the input unit.

[0195] That is, as illustrated in FIG. 17, a UI for selecting a video mode can be provided to the user, and when the user inputs a command to select a video mode by operating an external device such as a remote control, at least one processor (91) can change the video mode based on this.

[0196] As another embodiment, at least one processor (91) may automatically change the image mode based on received image information.

[0197] For example, when image data is received (1901), at least one processor (91) can distinguish the type of image based on the received image data (1903) and change the image mode according to the distinguished image type (1905).

[0198] For example, when receiving sports video data as in FIG. 18, at least one processor (91) can distinguish the video type as a sports video and change the video mode to Dynamic Mode accordingly. In addition, when the received video data is a movie, at least one processor (91) can distinguish the video type as a movie and change the video mode to Movie Mode.

[0199] Based on the changed image mode, the aforementioned current value reduction control can be performed so that users can view images with appropriate color, etc., according to the type of image.

[0200] Below, the arrangement of various components included in a display device (10) according to one embodiment is described.

[0201] FIGS. 20 and 21 illustrate the arrangement of a dimming driver, a driving element, and a light-emitting element included in a display device according to one embodiment.

[0202] Referring to FIGS. 20 and 21, the display device (10) includes a dimming driver (170), a plurality of driving elements (310, 320, 330, 340: 300), and a plurality of light sources (111).

[0203] Each of the plurality of light sources includes 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 single group.

[0204] A plurality of driving elements (300) can receive an analog dimming signal from a dimming driver (170) and supply driving current to a plurality of light sources (111) according to the received analog dimming signal.

[0205] As illustrated in FIG. 20, a plurality of light sources belonging to one dimming block can receive current from the same driving element. For example, a plurality of light sources belonging to a first dimming block (210) can receive driving current from a first driving element (310). A plurality of light sources belonging to a second dimming block (220) can receive driving current from a second driving element (320). A plurality of light sources belonging to a third dimming block (230) can receive driving current from a third driving element (330). A plurality of light sources belonging to a fourth dimming block (240) can receive driving current from a fourth driving element (340). In the same manner, a plurality of light sources belonging to an nth dimming block can receive driving current from an nth driving element.

[0206] Accordingly, multiple light sources belonging to a single dimming block can be supplied with driving currents of the same magnitude. In addition, multiple light sources belonging to a single dimming block can emit light of the same intensity.

[0207] In addition, in the case of the present invention, a plurality of light-emitting elements (111) belonging to one dimming block (200) may include a red light-emitting diode (190R), a green light-emitting diode (190G), and a blue light-emitting diode (190B) as described above, and in this case, light-emitting diodes of the same color may be supplied with current from the driving element along the same current supply line.

[0208] 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 an LED of the same color.

[0209] That is, as shown in Fig. 20, a single current supply line from the driving element can be arranged to connect only red LEDs, only green LEDs, or only blue LEDs.

[0210] The driving elements (300) can receive an analog dimming signal from the dimming driver (170) while the dimming driver (170) is input-activated and store the received analog dimming signal. In addition, while the 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.

[0211] A plurality of scan lines (S1, S2) for providing scan signals from a dimming driver (170) to a plurality of driving elements (300) and a plurality of data lines (D1, D2) for providing analog dimming signals from a dimming driver (170) to a plurality of driving elements (300) are provided.

[0212] A plurality of dimming blocks (200) may be arranged in a plurality of rows and a plurality of columns. The driving elements that supply driving current to the light sources of the dimming blocks belonging to the same row may share the same scan line. For example, the first driving element (310) and the second driving element (320) may share the first scan line (S1), and the third driving element (330) and the fourth driving element (340) may share the second scan line (S2).

[0213] Additionally, the driving elements that supply driving current to the light sources of the 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).

[0214] A plurality of driving elements (300) are input-activated by a scan signal of the dimming driver (170) and can receive an analog dimming signal of the dimming driver (170).

[0215] 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.

[0216] 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.

[0217] When a plurality of driving elements (300) receive an analog dimming signal, they can store the received analog dimming signal and supply driving current to a plurality of light sources according to the stored analog dimming signal.

[0218] 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).

[0219] 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).

[0220] By driving in this active matrix manner, a plurality of driving elements (300) can sequentially receive an analog dimming signal from a dimming driver (170), and can supply a driving current to a plurality of light sources even during input-deactivation when no analog dimming signal is received from the dimming driver (170).

[0221] In addition, by driving in an active matrix manner, the number of pins of the dimming driver (170) for providing analog dimming signals to a plurality of dimming blocks (200) is reduced. In addition, the number of signal lines for providing analog dimming signals from the dimming driver (170) to the plurality of dimming blocks (200) is reduced. Accordingly, the number of dimming blocks can be increased without limitation on the number of pins of the dimming driver (170).

[0222] The plurality of driving elements (300) may include circuits of various topologies to implement active matrix driving.

[0223] For example, as illustrated in FIG. 11, each of the plurality of driving elements (300) may include a circuit of a 1C2T (one capacitor two transistor) topology.

[0224] Each of the plurality of driving elements (300) may include a driving transistor (Tdr), a switching transistor (Tsw), and a storage capacitor (Cs).

[0225] A driving transistor (Tdr) includes an input terminal, an output terminal, and a control terminal. The input terminal of the driving transistor (Tdr) is connected to a power source (Vdd), and the output terminal can be connected to multiple light sources. The driving transistor (Tdr) can supply driving current to the multiple light sources according to the voltage of the control terminal.

[0226] 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).

[0227] The switching transistor (Tsw) also includes an input terminal, an output terminal, and a control terminal. The input terminal of the switching transistor (Tsw) may be connected to the data lines (D1, D2), and the output terminal of the switching transistor (Tsw) may be connected to the control terminal of the driving transistor (Tdr). The control terminal of the switching transistor (Tsw) may be connected to the scan lines (S1, S2).

[0228] The switching transistor (Tsw) is turned on by a scan signal of a scan line (S1, S2) and can transmit an analog dimming signal of a data line (D1, D2) to a storage capacitor (Cs) and a driving transistor (Tdr). The analog dimming signal of the data line (D1, D2) is input to a 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) can store a charge according to the analog dimming signal and output a voltage corresponding to the analog dimming signal.

[0229] 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 a plurality of light sources.

[0230] The circuit illustrated in Fig. 21 is only 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 added transistor for compensating the body effect of the driving transistor (Tdr).

[0231] The driving element (300) may be provided as a single chip in which the circuit illustrated in FIG. 21 is integrated, for example. In other words, the circuit illustrated in FIG. 21 may be integrated into one semiconductor chip.

[0232] Fig. 22 is a drawing for explaining the driving current wiring of the driving element of the backlight unit according to one embodiment.

[0233] According to one embodiment, a plurality of driving elements (300) are arranged between two adjacent rows of a plurality of dimming blocks (200), as illustrated in FIG. 22, and can supply driving current to at least one of a plurality of dimming blocks (200) included in an adjacent row through a plurality of driving current wires (350).

[0234] At this time, each of the plurality of driving current wires (350) can be connected to two dimming blocks (200) arranged in adjacent rows.

[0235] For example, as illustrated in FIG. 22, one driving current wire (350) of the first driving element (301) may be connected to two dimming blocks (200) arranged in each of two adjacent rows (200-1a, 200-2a), including a first connection wire (351) connected to a first row (200-1a) of the array of dimming blocks (200) and a second connection wire (352) connected to a second row (200-2a) of the array of dimming blocks (200). That is, each of the plurality of driving elements (300) may supply driving current to a plurality of light-emitting elements (111) included in at least two dimming blocks (200).

[0236] Even in this case, as described above, the driving current wiring coming from the driving element can be connected only to LEDs of the same color to supply current. That is, taking one driving current wiring (350) of one driving element (301) as an example, three lines of driving current wiring can be arranged so that they can start from the driving element and be connected only to LEDs of the same color included in each dimming block (200). That is, among the three lines of one driving current wiring (350) of one driving element (301), the first line can be connected to a plurality of red LEDs, the second line can be connected to a plurality of green LEDs, and the third line can be connected to a plurality of blue LEDs.

[0237] Below, the structure of the substrate and chassis included in the display device (10) is described.

[0238] FIG. 23 is a drawing illustrating a substrate and bottom chassis of a display device according to one embodiment.

[0239] The backlight unit (100) may include a light source device (1000). The light source device (1000) may generate and emit light. Specifically, the light source device (1000) may be configured to emit monochromatic light or white light. Additionally, as in an embodiment of the present invention, it may be configured to emit light of multiple colors.

[0240] The light source device (1000) may include a plurality of light sources (1100) arranged to irradiate light and a substrate (1200) on which the plurality of light sources (1100) are mounted.

[0241] A plurality of light source devices (1000) may be placed in front (in the +X direction) of the bottom chassis (15). For example, the plurality of light source devices (1000) may each be mounted on the bottom chassis (15). That is, the plurality of light source devices (1000) may each be fixed to the bottom chassis (15) and supported by the bottom chassis (15).

[0242] For example, a plurality of light source devices (1000) may be formed in shapes that correspond to each other. In other words, each of the plurality of light source devices (1000) may have approximately the same structure.

[0243] For example, as illustrated in FIG. 23, a light source device (1000A) positioned on the right side (+Y direction side) of the display device (10) among the plurality of light source devices (1000) and a light source device (1000B) positioned on the left side (-Y direction side) of the display device (10) among the plurality of light source devices (1000) may be arranged so that their vertical and horizontal directions are opposite to each other (i.e., so as to be positioned in a state where they are rotated 180 degrees relative to the X axis). According to this arrangement, the plurality of light source devices (1000) may be arranged so as to be symmetrical left and right with respect to the horizontal direction center of the display device (10), and luminance on both sides with respect to the horizontal direction center of the display device (10) may be uniformly provided.

[0244] As the plurality of light source devices (1000) are designed to have almost identical shapes, waste of parts can be prevented and the efficiency of the manufacturing process can be improved, thereby reducing the manufacturing cost.

[0245] However, this is not limited thereto, and at least some of the plurality of light source devices (1000) may be formed to have different shapes.

[0246] Although FIG. 23 illustrates an example in which a display device (10) includes eight light source devices (1000), the number of light source devices (1000) included in the display device (10) is not limited to that shown in FIG. 5. For example, the number of light source devices (1000) included in the display device (10) may be greater or less than that shown in FIG. 5. Alternatively, for example, the display device (10) may include only one integrally formed light source device (1000).

[0247] Below, the structure of one light source device (1000) among the plurality of light source devices (1000) will be described in detail. In one embodiment, the structure of one light source device (1000) described below can be applied to each of the plurality of light source devices (1000).

[0248] FIG. 24 is an enlarged view of a portion of a substrate and bottom chassis of a display device according to one embodiment.

[0249] Referring to FIG. 24, a light source device (1000) of a display device (10) according to one embodiment of the present disclosure may include a plurality of substrate bars (1220).

[0250] The substrate bar (1220) may be a configuration that forms at least a portion of the aforementioned substrate (1200), and may include a printed circuit board having a shape extending in one direction.

[0251] At least a portion of a plurality of light sources (1100) may be mounted on each of the plurality of substrate bars (1220). At least a portion of the plurality of light sources (1100) may be mounted on the front surface of the plurality of substrate bars (1220). Here, the front surface of the plurality of substrate bars (1220) means one surface of the plurality of substrate bars (1220) facing the display panel (20).

[0252] The plurality of substrate bars (1220) may be composed of a printed circuit board on which a light source (1100) is mounted.

[0253] A plurality of substrate bars (1220) may be arranged to be spaced apart from each other. The plurality of substrate bars (1220) may be arranged to be spaced apart from each other along a first direction (Z). For example, the first direction (Z) in which the plurality of substrate bars (1220) are arranged to be spaced apart from each other may be approximately parallel to the vertical direction (i.e., the up-down direction) of the display device (10). The plurality of substrate bars (1220) may be arranged to be parallel at positions spaced apart from each other.

[0254] Each of the plurality of substrate bars (1220) may be formed to have a general bar shape. Specifically, each of the plurality of substrate bars (1220) may have a width in a first direction (Z) and may extend in a second direction (Y) different from the first direction (Z). That is, each of the plurality of substrate bars (1220) may have a shape in which the length in the second direction (Y) is longer than the width in the first direction (Z).

[0255] For example, the width direction of each of the plurality of substrate bars (1220) may be approximately parallel to the vertical direction (i.e., up-down direction) of the display device (10). For example, the direction in which each of the plurality of substrate bars (1220) extends may be approximately parallel to the horizontal direction (i.e., left-right direction) of the display device (10).

[0256] For example, the direction in which each of the plurality of substrate bars (1220) extends may be parallel to the long side direction of the display device (10). For example, the width direction of each of the plurality of substrate bars (1220) may be parallel to the short side direction of the display device (10).

[0257] The direction in which the plurality of substrate bars (1220) are arranged spaced apart from each other may be parallel to the respective width directions. In other words, the plurality of substrate bars (1220) may be arranged spaced apart from each other along the first direction (Z), which is the respective width direction.

[0258] Each of the plurality of substrate bars (1220) may extend in a direction different from the direction in which the plurality of substrate bars (1220) are spaced apart from each other. Specifically, each of the plurality of substrate bars (1220) may extend in a direction (Y direction) orthogonal to the direction in which the plurality of substrate bars (1220) are spaced apart from each other (Z direction). That is, the first direction and the second direction described above may be directions orthogonal to each other.

[0259] In contrast, the direction in which the plurality of substrate bars (1220) are arranged spaced apart from each other and the direction in which each of the plurality of substrate bars (1220) extends have a predetermined angle with each other, but the angle may not be exactly perpendicular.

[0260] For example, a plurality of substrate bars (1220) may be arranged so that the distances spaced apart from each other in the first direction (Z) are uniform. In other words, the distances between adjacent pairs of substrate bars (1220) among the plurality of substrate bars (1220) in the first direction (Z) may all be approximately the same. As a result, the uniformity of the luminance of the display device (10) may be improved.

[0261] For example, the plurality of substrate bars (1220) may be formed to have shapes that correspond to each other. For example, the plurality of substrate bars (1220) may have widths that correspond to each other in the first direction (Z direction). For example, the plurality of substrate bars (1220) may have lengths that correspond to each other extending in the second direction (Y direction). For example, the plurality of substrate bars (1220) may be formed to have sizes that correspond to each other.

[0262] For example, each of the plurality of substrate bars (1220) can be mounted on the bottom chassis (15). As each of the plurality of substrate bars (1220) is mounted on the bottom chassis (15) and maintains a fixed position, the plurality of light sources (1100) mounted on the plurality of substrate bars (1220) can be stably positioned at their respective designed positions.

[0263] A reflective sheet (120) may be attached to the front surface of each of the plurality of substrate bars (1220).

[0264] The light source device (1000) of the display device (10) may include a substrate body (1210). The substrate body (1210) may be a configuration that forms a portion of the aforementioned substrate (1200) and may include a printed circuit board.

[0265] A plurality of substrate bars (1220) may be connected to a substrate body (1210). The plurality of substrate bars (1220) may be supported by the substrate body (1210). For example, the plurality of substrate bars (1220) may be connected to one side of the substrate body (1210).

[0266] A plurality of substrate bars (1220) may extend from the substrate body (1210). For example, each of the plurality of substrate bars (1220) may extend from the substrate body (1210) in a second direction (Y). For example, each of the plurality of substrate bars (1220) may extend from one side of the substrate body (1210) in the second direction (Y).

[0267] For example, the substrate body (1210) may extend along the first direction (Z). For example, the substrate body (1210) may have a shape in which the length in the first direction (Z) is longer than the width in the second direction (Y). In this case, the substrate body (1210) may have a structure in which a greater number of substrate bars (1220) are connected as the substrate body (1210) extends along the direction in which the plurality of substrate bars (1220) are arranged. In addition, in this case, the plurality of substrate bars (1220) may have a shape in which each of the substrate bars (1220) extends longer as it extends from one side in the second direction (Y), which is the width direction of the substrate body (1210) (i.e., the direction in which the length is relatively short).

[0268] For example, the substrate body (1210) can be mounted on the bottom chassis (15). As the substrate body (1210) is mounted on the bottom chassis (15) and maintains a fixed position, the plurality of light sources (1100) mounted on the substrate body (1210) can be stably positioned at their respective designed positions. In addition, as the substrate body (1210) is mounted on the bottom chassis (15), the plurality of substrate bars (1220) connected to the substrate body (1210) can be more stably supported by the substrate body (1210).

[0269] For example, some of the plurality of light sources (1100) may be mounted on the substrate body (1210). Some of the plurality of light sources (1100) may be mounted on the front surface of the substrate body (1210). Here, the front surface of the substrate body (1210) means one surface of the substrate body (1210) facing the display panel (20).

[0270] The substrate body (1210) may be composed of a printed circuit board on which a light source (1100) is mounted.

[0271] A reflective sheet (120) may be attached to the front surface of the substrate body (1210). For example, an integral reflective sheet (120) may be attached to the front surfaces of the substrate body (1210) and the plurality of substrate bars (1220). In this case, the uniformity of brightness due to light reflected by the reflective sheet (120) may be improved, and the process of attaching the reflective sheet (120) to the front surfaces of the substrate body (1210) and the plurality of substrate bars (1220) may be simplified. However, the present invention is not limited thereto, and a plurality of reflective sheets (120) that are distinct from each other may be attached to the front surfaces of the substrate body (1210) and the plurality of substrate bars (1220).

[0272] For example, the substrate body (1210) and the plurality of substrate bars (1220) may be formed integrally with each other. In other words, the substrate body (1210) and the plurality of substrate bars (1220) may be connected to each other to form an integral substrate (1200). The substrate (1200) may be formed as an integral printed circuit board including the substrate body (1210) and the plurality of substrate bars (1220). However, alternatively, the substrate body (1210) and the plurality of substrate bars (1220) may be connected to each other through a process of assembling them as separate components that are not formed integrally with each other.

[0273] The structure of the light source device (1000), such as the substrate body (1210) and the substrate bar (1220) described above with reference to FIG. 6 is only an example, and the idea of ​​the present disclosure is not limited thereto.

[0274] In FIG. 24, an embodiment is illustrated in which each of the plurality of substrate bars (1220) extends in the right direction (+Y direction) from the substrate body (1210), but the present invention is not limited thereto, and for example, the plurality of substrate bars (1220) may extend in the left direction (-Y direction) from the substrate body (1210).

[0275] In addition, although FIG. 24 illustrates an embodiment in which the substrate body (1210) extends in the vertical direction (Z direction) of the display device (10), the present invention is not limited thereto, and for example, the substrate body (1210) may extend in the horizontal direction (Y direction).

[0276] In addition, although FIG. 24 illustrates an embodiment in which each of the plurality of substrate bars (1220) extends in the horizontal direction (Y direction) from one side of the substrate body (1210) in the horizontal direction (Y direction), the present invention is not limited thereto, and for example, each of the plurality of substrate bars (1220) may extend in the vertical direction (Z direction) from one side of the substrate body (1210) in the vertical direction (Z direction). In this case, the plurality of substrate bars (1220) may be arranged to be spaced apart from each other in the horizontal direction (Y direction).

[0277] In addition, unlike what has been described above, the first direction, which is the width direction of each of the plurality of substrate bars (1220), or the first direction in which the plurality of substrate bars (1220) are arranged to be spaced apart from each other, or the first direction in which the substrate body (1210) extends, or the second direction in which each of the plurality of substrate bars (1220) extends, may not be parallel to either the vertical direction (Z direction) or the horizontal direction (Y direction) of the display device (10).

[0278] A display device according to one embodiment includes a liquid crystal panel; a backlight unit that provides light to the liquid crystal panel; and at least one processor that controls the liquid crystal panel and the backlight unit, wherein the backlight unit includes: a substrate; a plurality of dimming blocks arranged in a plurality of rows and a plurality of columns on the substrate, each dimming block including a plurality of light-emitting elements; and a plurality of driving elements that drive the plurality of dimming blocks, wherein each of the plurality of light-emitting elements includes a red LED, a green LED, and a blue LED, and wherein the at least one processor can control the plurality of driving elements to adjust a current value supplied to at least one of the red LED, the green LED, and the blue LED according to an image mode.

[0279] According to the present disclosure, power consumption can be reduced by adjusting the current value supplied to at least one of a red LED, a green LED, and a blue LED included in a backlight unit depending on the image mode.

[0280] Additionally, since the backlight unit includes red LEDs, green LEDs, and blue LEDs as light sources, it can have higher color purity and contrast ratio than local dimming using a single light.

[0281] The at least one processor can control the plurality of driving elements to reduce a current value supplied to at least one of the red LED, the green LED, and the blue LED as the image mode changes.

[0282] The at least one processor can control the plurality of driving elements to supply current corresponding to the reduced current value to the plurality of dimming blocks based on the received image information.

[0283] The at least one processor can reduce the current value supplied to the green LED and the blue LED through PAM (Pulse Amplitude Modulation) control, and supply current corresponding to the reduced current value to the plurality of dimming blocks.

[0284] The at least one processor can control the driving element to supply current corresponding to the image information to each of the plurality of dimming blocks based on the received image information.

[0285] The at least one processor can supply current corresponding to the image information to each of the plurality of dimming blocks through PWM (Pulse Width Modulation) control.

[0286] An input unit for receiving user input is further included, wherein the image mode can be changed based on the user input received through the input unit.

[0287] The at least one processor can automatically change the image mode based on the received image information.

[0288] Each of the plurality of driving elements can supply driving current to a plurality of light-emitting elements included in at least two dimming blocks.

[0289] Each of the plurality of driving elements further includes a plurality of current supply lines for supplying driving current, and each of the plurality of current supply lines can be arranged to supply driving current to an LED of the same color.

[0290] The above driving element may be placed on the upper or lower surface of the substrate.

[0291] Each of the above plurality of dimming blocks may include a predetermined number of light-emitting elements.

[0292] According to one embodiment, a display device includes a liquid crystal panel; a backlight unit that provides light to the liquid crystal panel; an input unit that receives a user input; and at least one processor that controls the liquid crystal panel and the backlight unit, wherein the backlight unit includes: a substrate; a plurality of dimming blocks arranged in a plurality of rows and a plurality of columns on the substrate, each dimming block including a plurality of light-emitting elements; and a plurality of driving elements that drive the plurality of dimming blocks, wherein each of the plurality of light-emitting elements includes a red LED, a green LED, and a blue LED, and wherein the at least one processor can control the plurality of driving elements so that a current value supplied to at least one of the red LED, the green LED, and the blue LED is reduced based on a change in the image mode according to a user's image mode selection input input through the input unit.

[0293] The at least one processor can control the plurality of driving elements to supply current corresponding to the reduced current value to the plurality of dimming blocks based on the received image information.

[0294] The at least one processor can control the driving element to supply current corresponding to the image information to each of the plurality of dimming blocks based on the received image information.

[0295] A display device according to one embodiment includes a liquid crystal panel; a backlight unit that provides light to the liquid crystal panel; and at least one processor that controls the liquid crystal panel and the backlight unit, wherein the backlight unit includes: a substrate; a plurality of dimming blocks arranged in a plurality of rows and a plurality of columns on the substrate, each dimming block including a plurality of light-emitting elements; and a plurality of driving elements that drive the plurality of dimming blocks, wherein each of the plurality of light-emitting elements includes a red LED, a green LED, and a blue LED, and wherein the at least one processor can control the plurality of driving elements to change an image mode based on received image information and to decrease a current value supplied to at least one of the red LED, the green LED, and the blue LED based on the change in the image mode.

[0296] The at least one processor can control the plurality of driving elements to supply current corresponding to the reduced current value to the plurality of dimming blocks based on the received image information.

[0297] The at least one processor can control the driving element to supply current corresponding to the image information to each of the plurality of dimming blocks based on the received image information.

[0298] According to the disclosed invention, power consumption can be reduced by adjusting the current value supplied to at least one of a red LED, a green LED, and a blue LED included in a backlight unit according to the image mode.

[0299] Additionally, since the backlight unit includes red LEDs, green LEDs, and blue LEDs as light sources, it can have higher color purity and contrast ratio than local dimming using a single light.

[0300] Meanwhile, the disclosed embodiments may be implemented in the form of a recording medium storing computer-executable instructions. The instructions may be stored in the form of program code, and when executed by a processor, may generate program modules to perform the operations of the disclosed embodiments. The recording medium may be implemented as a computer-readable recording medium.

[0301] Computer-readable storage media include all types of storage media that store instructions that can be deciphered by a computer. Examples include read-only memory (ROM), random access memory (RAM), magnetic tape, magnetic disks, flash memory, and optical data storage devices.

[0302] The disclosed embodiments have been described with reference to the attached drawings as described above. Those skilled in the art will understand that the present invention can be implemented in forms other than the disclosed embodiments without altering the technical spirit or essential features of the present invention. The disclosed embodiments are illustrative and should not be construed as limiting.

Claims

liquid crystal panel; A backlight unit that provides light to the liquid crystal panel; and At least one processor controlling the liquid crystal panel and the backlight unit; The above backlight unit, substrate; A plurality of dimming blocks arranged in a plurality of rows and a plurality of columns on the substrate, each dimming block including a plurality of light-emitting elements; A plurality of driving elements for driving the plurality of dimming blocks are included; Each of the above plurality of light-emitting elements, Contains a red LED, a green LED, and a blue LED, At least one processor, A display device that controls the plurality of driving elements to adjust the current value supplied to at least one of the red LED, the green LED, and the blue LED according to the image mode. In paragraph 1, At least one processor, A display device that controls the plurality of driving elements to reduce the current value supplied to at least one of the red LED, the green LED, and the blue LED according to the image mode. In the second paragraph, At least one processor, A display device that controls the plurality of driving elements to supply current corresponding to the reduced current value to the plurality of dimming blocks based on the acquired image information. In the third paragraph, At least one processor, A display device that reduces the current value supplied to the green LED and the blue LED through PAM (Pulse Amplitude Modulation) control, and supplies current corresponding to the reduced current value to the plurality of dimming blocks. In the third paragraph, At least one processor, A display device that controls the driving element to supply current corresponding to the image information to each of the plurality of dimming blocks based on the received image information. In paragraph 5, At least one processor, A display device that supplies current corresponding to the image information to each of the plurality of dimming blocks through PWM (Pulse Width Modulation) control. In paragraph 1, further comprising an input unit for obtaining user input; The above video mode is, A display device that changes based on user input obtained through the above input unit. In paragraph 1, At least one processor, A display device that automatically changes the image mode based on received image information. In paragraph 1, A display device in which each of the plurality of driving elements supplies driving current to a plurality of light-emitting elements included in at least two dimming blocks. In paragraph 9, Each of the plurality of driving elements further includes a plurality of current supply lines for supplying driving current; Each of the above plurality of current supply lines, A display device arranged to supply driving current to LEDs of the same color. In paragraph 1, The above driving element is, A display device provided on the upper or lower surface of the above substrate. In paragraph 1, Each of the above plurality of dimming blocks, A display device containing a predetermined number of light-emitting elements. liquid crystal panel; A backlight unit that provides light to the liquid crystal panel; an input unit for receiving user input; and At least one processor controlling the liquid crystal panel and the backlight unit; The above backlight unit, substrate; A plurality of dimming blocks arranged in a plurality of rows and a plurality of columns on the substrate, each dimming block including a plurality of light-emitting elements; A plurality of driving elements for driving the plurality of dimming blocks are included; Each of the above plurality of light-emitting elements, Contains a red LED, a green LED, and a blue LED, At least one processor, A display device that controls the plurality of driving elements so that the current value supplied to at least one of the red LED, the green LED, and the blue LED decreases based on the change in the image mode according to the user's image mode selection input input through the input unit. In paragraph 13, At least one processor, A display device that controls the plurality of driving elements to supply current corresponding to the reduced current value to the plurality of dimming blocks based on the acquired image information. In paragraph 14, At least one processor, A display device that controls the driving element to supply current corresponding to the image information to each of the plurality of dimming blocks based on the received image information.

Images