Display appartus having display module

Abstract

A display module according to an embodiment disclosed herein comprises: a plurality of inorganic light emitting elements for radiating light forward; a substrate having a mounting surface on which the plurality of inorganic light emitting elements are mounted; a front cover provided to cover the mounting surface of the substrate from the front; a mirror layer disposed between the front cover and the plurality of inorganic light emitting elements; a reflective layer disposed between the mirror layer and the plurality of inorganic light emitting elements to reflect at least a portion of the light radiated from the plurality of inorganic light emitting elements; and an adhesive layer disposed between the reflective layer and the mounting surface to adhere the reflective layer to the mounting surface, wherein the reflective layer is provided to reflect at least a portion of the light, radiated from the plurality of inorganic light emitting elements, according to the refractive index difference with the adhesive layer.

Description

Display device including a display module

[0001] The present invention relates to a display device that displays an image by combining modules in which self-luminous inorganic light-emitting elements are mounted on a substrate.

[0002] A display device is a type of output device that visually displays data information such as characters, shapes, and images.

[0003] Typically, liquid crystal panels (LCDs), which require backlighting, or organic light-emitting diode (OLED) panels, which are made of a film of organic compounds that emit light on their own in response to current, have been primarily used as display devices. However, liquid crystal panels have slow response times, consume a lot of power, and are difficult to compact because they do not emit light themselves and require a backlight. Furthermore, OLED panels do not require a backlight because they emit light themselves, and although they can be made thin, they are vulnerable to burn-in (deterioration) when the same screen is displayed for a long time, as the subpixels reach their lifespan and certain parts of the previous screen remain even when the screen is changed. Accordingly, research is being conducted on micro light-emitting diode (microLED or μLED) panels as new panels to replace these panels, which mount inorganic light-emitting elements on a substrate and use the inorganic light-emitting elements themselves as pixels.

[0004] A micro light-emitting diode display panel (hereinafter, micro LED panel) is one of the flat panel display panels and is composed of a plurality of inorganic light-emitting diodes (inorganic LEDs), each of which is less than 100 micrometers in size.

[0005] These LED panels are also self-luminous elements, but as they are inorganic light-emitting elements, they do not suffer from the burn-in phenomenon of OLEDs and have excellent brightness, resolution, power consumption, and durability.

[0006] Compared to liquid crystal display (LCD) panels, which require backlighting, microLED display panels offer better contrast, response time, and energy efficiency. Both organic light-emitting diodes (OLEDs) and inorganic light-emitting diodes (MLEDs) are energy efficient, but MLEDs offer brightness, luminous efficacy, and a longer lifespan than OLEDs.

[0007] In addition, by arranging LEDs on a circuit board in pixel units, display modularization can be produced on a board-by-board basis, and it is easy to produce various resolutions and screen sizes to suit consumer orders.

[0008] One aspect of the present disclosure relates to a display module providing a mirror display and a display device including the same, and provides a display module and a display device including the same that improve the clarity of an image displayed on a mirror display.

[0009] 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.

[0010] A display module according to the invention comprises: a substrate including a plurality of inorganic light-emitting elements that radiate light forward; a mounting surface on which the plurality of inorganic light-emitting elements are mounted; a front cover provided to cover the mounting surface of the substrate from the front; a mirror layer provided between the front cover and the plurality of inorganic light-emitting elements; a reflective layer provided between the mirror layer and the plurality of inorganic light-emitting elements and configured to reflect at least a portion of light radiated from the plurality of inorganic light-emitting elements; and an adhesive layer provided between the reflective layer and the mounting surface and configured to adhere the reflective layer to the mounting surface, wherein the reflective layer is provided to reflect at least a portion of light radiated from the plurality of inorganic light-emitting elements based on a difference in refractive index between the reflective layer and the adhesive layer.

[0011] A display module and a display device including the same according to the invention can minimize color mixing of lights generated from a plurality of inorganic light-emitting elements through a reflective layer that is provided to reflect at least a portion of the light irradiated from a plurality of inorganic light-emitting elements.

[0012] FIG. 1 is a drawing illustrating a display module according to one embodiment of the present disclosure.

[0013] Fig. 2 is a diagram illustrating the main components of the display module of Fig. 1 in an exploded manner.

[0014] Fig. 3 is an enlarged cross-sectional view of a portion of the display module of the display module illustrated in Fig. 1.

[0015] Figure 4 is a schematic drawing showing a cross-section of the display module illustrated in Figure 1.

[0016] Figure 5 is a schematic drawing showing a cross-section of the display module illustrated in Figure 1.

[0017] Figure 6 is a schematic drawing showing a cross-section of the display module illustrated in Figure 1.

[0018] The embodiments described in this specification are only the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that various equivalents or modified examples that can replace them at the time of filing this application are also included in the scope of the rights of the present invention.

[0019] Singular expressions used in the description may include plural expressions unless the context clearly indicates otherwise. In the drawings, elements such as shape and size may be exaggerated for clarity.

[0020] In connection with the description of the drawings, similar reference numerals may be used for similar or related components.

[0021] The singular form of a noun corresponding to an item may include one or more of said items, unless the relevant context clearly indicates otherwise.

[0022] In this document, each of the phrases "A or B", "at least one of A and B", "at least one of A or B", "A, B, or C", "at least one of A, B, and C", and "at least one of A, B, or C" may include any one of the items listed together in that phrase, or all possible combinations thereof.

[0023] The term “and / or” includes any combination of a plurality of related described elements or any one of a plurality of related described elements.

[0024] Terms such as "first," "second," or "first" or "second" may be used simply to distinguish one component from another and do not qualify the components in any other respect (e.g., importance or order).

[0025] When a component (e.g., a first component) is referred to as being "coupled" or "connected" to another component (e.g., a second component), with or without the terms "functionally" or "communicatively," it means that the component can be connected to the other component directly (e.g., wired), wirelessly, or through a third component.

[0026] The terms “include” or “have” are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in this document, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0027] When a component is said to be “connected,” “coupled,” “supported,” or “in contact with” another component, this includes not only cases where the components are directly connected, coupled, supported, or in contact, but also cases where the components are indirectly connected, coupled, supported, or in contact through a third component.

[0028] When we say that a component is “on” another component, this includes not only cases where the component is in contact with the other component, but also cases where there is another component between the two components.

[0029] Furthermore, the meaning of "identical" in this specification includes having similar properties or being similar within a certain range. Furthermore, "identical" means "substantially identical." "Substantially identical" should be understood to include values ​​that fall within the manufacturing error range or values ​​that differ from the reference value within a range that has no significance.

[0030] Hereinafter, a preferred embodiment according to the present invention will be described in detail with reference to the attached drawings.

[0031] FIG. 1 is a drawing illustrating a display module according to one embodiment of the present disclosure, FIG. 2 is a drawing illustrating the main components of the display module of FIG. 1 in an exploded manner, and FIG. 3 is an enlarged cross-sectional view illustrating a portion of the components of one display module of the display module illustrated in FIG. 1.

[0032] Some components of the display device (1), including the plurality of inorganic light-emitting elements (50) illustrated in the drawing, are micro-unit components having a size of several μm to several hundred μm, and for convenience of explanation, the scale of some components (the plurality of inorganic light-emitting elements (50), the anisotropic conductive layer (47), etc.) is exaggerated.

[0033] A display device (1) is a device that displays information, data, and other information in the form of characters, shapes, graphs, images, etc., and a TV, PC, mobile, digital signage, etc. can be implemented as a display device (1).

[0034] The display device (1) may include a display module (10) that displays an image.

[0035] The display device (1) may be arranged to display an image on a screen (11) formed by one display module (10) as illustrated in FIG. 1, but is not limited thereto, and may be arranged to form one screen by having a plurality of display modules arranged vertically, horizontally, and horizontally adjacent to each other. The plurality of display modules may be arranged in a matrix form of M * N. In the present embodiment, 16 display modules (30A-30P) are provided and arranged in a matrix form of 4 * 4, but there is no limitation on the number and arrangement method of the plurality of display modules (30A-30P).

[0036] The display device (1) may include a power supply device that supplies power to the display module (10).

[0037] The display device (1) may include a main board that controls the overall operation of the display module (10).

[0038] The display device (1) may include a frame that supports a display module (10).

[0039] The display device (1) may include a cover covering the display module (10).

[0040] The display module (10) may be formed in a quadrangle type. The display module (10) may be provided in a rectangular (rectangle type) shape or a square (square type) shape.

[0041] The display module (10) may include a substrate (40) and a plurality of inorganic light-emitting elements (50) mounted on the substrate (40). The plurality of inorganic light-emitting elements (50) may be mounted on a mounting surface (41) of the substrate (40) facing in a first direction (X). In FIGS. 2 and 3, the thickness of the substrate (40) in the first direction (X) is shown exaggeratedly for convenience of explanation.

[0042] The substrate (40) may be formed in a quadrangle type. As described above, the display module (10) may be formed in a quadrangle shape, and the substrate (40) may be formed in a quadrangle type to correspond thereto. The substrate (40) may be formed in a rectangular (rectangle type) shape or a square (square type) shape.

[0043] The substrate (40) may include a substrate body (42), a mounting surface (41) forming one side of the substrate body (42), a rear surface (43) forming the other side of the substrate body (42) and positioned opposite the mounting surface (41), and a side surface (44) positioned between the mounting surface (41) and the rear surface (43). The space between the mounting surface (41) and the side surface (45) and between the rear surface (43) and the side surface (45) may be provided in a slanted chamfer shape.

[0044] The substrate (40) may include a TFT layer (Thin Film Transistor, 44) formed on the substrate body (42) to drive inorganic light-emitting elements (50). The substrate body (42) may include a glass substrate. That is, the substrate (40) may include a COG (Chip on Glass) type substrate. The substrate (40) may have first and second pad electrodes (44a, 44b) formed thereon so that the inorganic light-emitting elements (50) are electrically connected to the TFT layer (44).

[0045] The TFT (Thin Film Transistor) constituting the TFT layer (44) is not limited to a specific structure or type and may be configured in various embodiments. That is, the TFT of the TFT layer (44) according to one embodiment of the present invention may be implemented not only as an LTPS (Low Temperature Poly Silicon) TFT, an oxide TFT, a Si (poly silicon, or a-silicon) TFT, but also as an organic TFT, a graphene TFT, etc.

[0046] Additionally, the TFT layer (44) can be replaced with a CMOS (Complementary Metal-Oxide Semiconductor) type or n-type MOSFET or p-type MOSFET transistor when the substrate body (42) of the substrate (40) is made of a silicon wafer.

[0047] The plurality of inorganic light-emitting elements (50) are formed of an inorganic material and may include inorganic light-emitting elements having a size of several μm to several tens of μm in length, width, and height, respectively. The micro inorganic light-emitting elements may have a size in which the length of a short side among the length, width, and height is 100 μm or less. That is, the inorganic light-emitting elements (50) may be picked up from a sapphire or silicon wafer and directly transferred onto a substrate (40). The plurality of inorganic light-emitting elements (50) may be picked up and transferred by an electrostatic method using an electrostatic head or a stamp method using an elastic polymer material such as PDMS or silicon as a head.

[0048] The plurality of inorganic light-emitting elements (50) may be a light-emitting structure including an n-type semiconductor (58a), an active layer (58c), a p-type semiconductor (58b), a first contact electrode (57a), and a second contact electrode (57b).

[0049] Although not shown in the drawing, one of the first contact electrodes (57a) may be electrically connected to the n-type semiconductor (58a) of the second contact electrode (57b) and the other may be electrically connected to the p-type semiconductor (58b).

[0050] The first contact electrode (57a) and the second contact electrode (57b) may be horizontally arranged and may be in the form of a flip chip arranged in the same direction (opposite to the light-emitting direction).

[0051] The inorganic light-emitting element (50) has a light-emitting surface (54) arranged toward the first direction (X) when mounted on the mounting surface (41), a side surface (55), and a bottom surface (56) arranged on the opposite side of the light-emitting surface (54), and a first contact electrode (57a) and a second contact electrode (57b) can be formed on the bottom surface (56).

[0052] That is, the contact electrodes (57a, 57b) of the inorganic light-emitting element (50) are arranged on the opposite side of the light-emitting surface (54), and thus can be arranged on the opposite side of the direction in which light is irradiated.

[0053] The contact electrodes (57a, 57b) are arranged to face the mounting surface (41) and are electrically connected to the TFT layer (43), and a light-emitting surface (54) that irradiates light in a direction opposite to the direction in which the contact electrodes (57a, 57b) are arranged can be arranged.

[0054] Therefore, when light generated from the active layer (58c) is irradiated in the first direction (X) through the light-emitting surface (54), the light can be irradiated toward the first direction (X) without interference from the first contact electrode (57a) or the second contact electrode (57b).

[0055] That is, the first direction (X) can be defined as the direction in which the light-emitting surface (54) is positioned to irradiate light.

[0056] The first contact electrode (57a) and the second contact electrode (57b) can be electrically connected to the first pad electrode (44a) and the second pad electrode (44b) formed on the mounting surface (41) side of the substrate (40), respectively.

[0057] The inorganic light emitting element (50) can be directly connected to the pad electrodes (44a, 44b) through a bonding configuration such as an anisotropic conductive layer (47) or solder.

[0058] An anisotropic conductive layer (47) may be formed on the substrate (40) to mediate electrical connection between the contact electrodes (57a, 57b) and the pad electrodes (44a, 44b). The anisotropic conductive layer (47) may have a structure in which an anisotropic conductive adhesive is attached on a protective film and conductive balls (47a) are dispersed in an adhesive resin. The conductive balls (47a) are conductive spheres surrounded by a thin insulating film, and when the insulating film is broken by pressure, the conductors can be electrically connected to each other.

[0059] The anisotropic conductive layer (47) may include an anisotropic conductive film (ACF) in the form of a film and an anisotropic conductive paste (ACP) in the form of a paste.

[0060] In an embodiment according to the present invention, the anisotropic conductive layer (47) may be provided as an anisotropic conductive film.

[0061] Accordingly, when a plurality of inorganic light-emitting elements (50) are mounted on a substrate (40), when pressure is applied to the anisotropic conductive layer (47), the insulating film of the conductive ball (47a) is broken, so that the contact electrodes (57a, 57b) of the inorganic light-emitting elements (50) and the pad electrodes (44a, 44b) of the substrate (40) can be electrically connected.

[0062] However, although not shown in the drawing, a plurality of inorganic light-emitting elements (50) may be mounted on the substrate (40) via solder (not shown) instead of the anisotropic conductive layer (47). After the inorganic light-emitting elements (50) are aligned on the substrate (40), the inorganic light-emitting elements (50) may be bonded to the substrate (40) through a reflow process.

[0063] A plurality of inorganic light-emitting elements (50) may include a red light-emitting element (51), a green light-emitting element (52), and a blue light-emitting element (53), and the light-emitting elements (50) may be mounted on a mounting surface (41) of a substrate (40) as a unit, with a series of red light-emitting elements (51), green light-emitting elements (52), and blue light-emitting elements (53). A series of red light-emitting elements (51), green light-emitting elements (52), and blue light-emitting elements (53) may form one pixel. At this time, the red light-emitting element (51), the green light-emitting element (52), and the blue light-emitting element (53) may each form a sub-pixel.

[0064] The red light emitting element (51), the green light emitting element (52), and the blue light emitting element (53) may be arranged in a row at a predetermined interval in the second direction (Y) or the third direction (Z) as in the embodiment of the present invention, or may be arranged in a shape other than this, such as a triangle shape, in a two-dimensional plane formed by the second direction (Y) and the third direction (Z).

[0065] The substrate (40) may include a light absorbing layer (44c) to absorb external light and improve contrast. The light absorbing layer (44c) may be formed on the entire mounting surface (41) side of the substrate (40). The light absorbing layer (44c) may be formed between the TFT layer (43) and the anisotropic conductive layer (47). However, the present invention is not limited thereto, and the light absorbing layer (44c) may be omitted if the anisotropic conductive layer (47) can perform the function of the light absorbing layer (44c).

[0066] The anisotropic conductive layer (47) may have a black color. This is to perform the role of the light-absorbing layer (44c) or to complement the role of the light-absorbing layer (44c). In addition, as will be described later, the anisotropic conductive layer (47) may be provided in a black color so that light reflected by the reflective layer () described later is absorbed.

[0067] A plurality of inorganic light-emitting elements (50) can be electrically connected to a front wiring layer (not shown) formed by pixel driving wiring (not shown) formed on a mounting surface (41) and extending through a side surface (45) of a substrate (40) and formed by pixel driving wiring (not shown).

[0068] A front wiring layer (not shown) may be formed on the lower side of the two-way conductive layer (47). The front wiring layer (not shown) may be electrically connected to a side wiring (46) formed on a side surface (45) of a substrate (40). The side wiring (46) may be provided in a thin film form. The side wiring (46) may include a coating member that surrounds the side wiring (46) to prevent damage that may occur when the side wiring (46) is exposed to the outside. The side wiring (46) may extend along the side surface (45) to the rear surface (43) of the substrate (40).

[0069] The side wiring (46) may extend along the side (45) of the substrate (40) and be connected to a back wiring layer (43b) formed on the back (43). Specifically, the side wiring (46) may be connected to a back pad provided so that the back wiring layer (43c) and the side wiring (46) are electrically connected. The back pad may be formed on the edge of the back (43) of the substrate (41).

[0070] An insulating layer (43c) covering the back wiring layer (43b) can be formed on the back wiring layer (43b) in the direction in which the back surface of the substrate (40) faces.

[0071] That is, a plurality of inorganic light-emitting elements (50) can be sequentially electrically connected to the front wiring layer (not shown), the side wiring (46), and the back wiring layer (43b).

[0072] In this embodiment, the black matrix (48) is formed to be placed between pixels formed by a series of red light-emitting elements (51), green light-emitting elements (52), and blue light-emitting elements (53). However, unlike this embodiment, the black matrix may be formed more finely to partition each of the light-emitting elements (51, 52, 53), which are sub-pixels.

[0073] The black matrix (48) can be formed in a grid shape with horizontal and vertical patterns to be placed between pixels.

[0074] The black matrix (48) can be formed by applying light-absorbing ink onto an anisotropic conductive layer (47) through an ink-jet process and then curing it, or by coating a light-absorbing film on the anisotropic conductive layer (47).

[0075] That is, a black matrix (48) can be formed between a plurality of inorganic light-emitting elements (50) that are not mounted on an anisotropic conductive layer (47) formed entirely on a mounting surface (41).

[0076] The display module (10) may include a front cover (50) that is placed on the mounting surface (41) in the first direction (X) to cover the mounting surface (41) of the display module (10).

[0077] The front cover (50) is provided to cover the substrate (40) and can protect the substrate (40) from external force or external moisture.

[0078] The front cover (50) may be arranged to be placed on the screen (11) of the display module (10) and to allow the image displayed on the screen (11) to be displayed forward through the front cover (50).

[0079] For example, the front cover (50) may be formed of glass material.

[0080] For example, functional layers having optical performance of the front cover (50) can be formed by stacking them.

[0081] The display module (10) may include a mirror layer (60) that is provided to reflect external light passing through the front cover (50) so that the screen (11) acts like a mirror.

[0082] When the display module (10) is not driven by the mirror layer (60), the screen (11) can be arranged to reflect light incident from the outside like a mirror.

[0083] The mirror layer (60) may be provided to be patterned on the back of the front cover (50).

[0084] For example, the mirror layer (60) may be made of a metal material.

[0085] For example, the mirror layer (60) can be made of a material with high reflectivity.

[0086] The mirror layer (60) may include through holes (61, 62, 63) provided so that light emitted from a plurality of inorganic light-emitting elements (50) when the display module (20) is driven passes through the mirror layer (60) and is radiated forward.

[0087] The through holes (61, 62, 63) may include a first through hole (61) arranged at a position corresponding to the red light-emitting element (51) in the first direction (X), a second through hole (62) arranged at a position corresponding to the green light-emitting element (52) in the first direction (X), and a third through hole (63) arranged at a position corresponding to the blue light-emitting element (53) in the first direction (X).

[0088] Light irradiated from multiple inorganic light-emitting elements (50) passes through optical holes (61, 62, 63) and is radiated forward, allowing an image to be displayed facing forward. Accordingly, when the display module (20) is not driven, the screen (11) can be used as a mirror, and when the display module (20) is driven, an image can be displayed on the screen (11).

[0089] The display module (10) may include a reflective layer (100) arranged between a mirror layer (60) and a plurality of inorganic light-emitting elements (50) and arranged to reflect at least a portion of the light irradiated from the plurality of inorganic light-emitting elements (50) toward the mounting surface (41).

[0090] As will be described later, the reflective layer (100) can prevent the image on the screen (11) from being mixed in color by reflecting light irradiated through a through hole that does not correspond to each light emitting element among the plurality of inorganic light emitting elements (50).

[0091] The reflective layer (100) may be arranged so that the mirror layer (60) is in contact with the back surface of the patterned front cover (50).

[0092] The front cover (50) and the reflective layer (100) may be arranged to be in contact with the substrate (40) while being bonded to each other. However, this is not limited thereto, and the rear surface of the front cover (50) may be arranged to be in contact with the reflective layer (100) while the reflective layer (100) is bonded to the substrate (40).

[0093] The display module (10) may include an adhesive layer (70) provided to adhere the reflective layer (100) to the mounting surface (41).

[0094] The adhesive layer (70) may be formed of an optical clear resin (OCR). The optical clear resin (OCR) may be highly transparent with a transmittance of 90% or more.

[0095] The adhesive layer (70) is made of optically clear resin (OCR), and can improve visibility and image quality by increasing transmittance through low-reflection characteristics. In a structure with an air gap, light loss occurs due to the difference in refractive index between the film layer and the air layer, but in a structure using optically clear resin (OCR), the difference in refractive index is reduced, reducing light loss and consequently improving visibility and image quality.

[0096] The adhesive layer (70) can protect the substrate (40) while adhering the reflective layer (100) and the front cover (50) connected thereto to the substrate (40), and can also have an advantage in terms of improving image quality.

[0097] The adhesive layer (70) may be provided to have a height greater than a predetermined height in the first direction (X) toward the mounting surface (41) or the light-emitting surface (54). This is to sufficiently fill a gap that may be formed between the adhesive layer (70) and the plurality of inorganic light-emitting elements (50) when the adhesive layer (70) is formed on the substrate (40).

[0098] Below, the reflective layer (100) is described in detail.

[0099] FIG. 4 is a drawing schematically illustrating a cross-section of the display module illustrated in FIG. 1, FIG. 5 is a drawing schematically illustrating a cross-section of the display module illustrated in FIG. 1, and FIG. 6 is a drawing schematically illustrating a cross-section of the display module illustrated in FIG. 1.

[0100] In a display module (10) that provides a mirror display in which the screen (11) functions as a mirror, the screen (11) can be divided into an area that reflects external light and an area in which an image is displayed by light irradiated from a plurality of inorganic light-emitting elements (50) through through holes (61, 62, 63).

[0101] Light irradiated from multiple inorganic light-emitting elements (50) can be displayed on a screen (11) through through holes (61, 62, 63) corresponding to each inorganic light-emitting element (51, 52, 53) to form an image.

[0102] In the case of a display module (10) providing a mirror display, as described above, light irradiated from a plurality of inorganic light-emitting elements (50) is displayed on a screen (11) through through-holes (61, 62, 63). However, when light irradiated from each inorganic light-emitting element (51, 52, 53) is displayed on the screen (11) through through-holes (61, 62, 63) that do not correspond to the through-holes (61, 62, 63) corresponding to each inorganic light-emitting element (51, 52, 53), a part of the image displayed on the screen (11) may be displayed in mixed colors, which may degrade the screen of the display module (10).

[0103] In detail, as illustrated in FIG. 4, most of the light (R1) generated from the red light-emitting element (51) can be irradiated forward by passing through the first through-hole (61) at a position corresponding to the front, most of the light (G1) generated from the green light-emitting element (52) can be irradiated forward by passing through the second through-hole (62) at a position corresponding to the front, and most of the light (B1) generated from the blue light-emitting element (53) can be irradiated forward by passing through the third through-hole (63) at a position corresponding to the front.

[0104] However, for example, some of the light emitted from the red light-emitting element (51) may be irradiated in a direction other than the first through-hole (61) depending on the radiation angle. As shown in FIG. 5, among some of the light emitted from the red light-emitting element (51), when light (R2) irradiated toward the second through-hole (62) passes through the second through-hole (62), the light passing through the second through-hole (62) may be a mixture of light (R2) emitted from the red light-emitting element (51) and light (G1) emitted from the green light-emitting element (52), and a color different from the color to be displayed may be displayed on the screen (11).

[0105] Also, as an example, when light (R3) irradiated toward the third through hole (63) as shown in FIG. 6 among some of the light emitted from the red light-emitting element (51) passes through the third through hole (63), the light passing through the third through hole (63) may be a mixture of light (R3) emitted from the red light-emitting element (51) and light (B1) emitted from the blue light-emitting element (53).

[0106] The display module (10) may include a reflective layer (100) to prevent light emitted from other inorganic light-emitting elements than light emitted from each inorganic light-emitting element (51, 52, 53) corresponding to the front of each through-hole (61, 62, 63) from passing through.

[0107] As shown in FIGS. 5 and 6, light emitted from other inorganic light-emitting elements, other than light emitted from each inorganic light-emitting element (51, 52, 53) corresponding to each through-hole (61, 62, 63) in the forward direction, is reflected by the reflective layer (100) and cannot pass through each through-hole (61, 62, 63) and is absorbed by the anisotropic conductive layer (47), or may proceed to the side of the display module (10) and be absorbed at the side of the display module (10).

[0108] The refractive index of the reflective layer (100) can be formed of a material having a lower refractive index than that of the adhesive layer (70).

[0109] The light emitted from each inorganic light emitting element (51, 52, 53) passes through the adhesive layer (70) and is incident on the reflective layer (100). At this time, the refractive index of the adhesive layer (70), which is the incident medium, is formed to be greater than the refractive index of the reflective layer (100), which is the refractive medium, so that the critical angle of total reflection at the incident surface of the reflective layer (100) can be minimized.

[0110] As the critical angle of total reflection of the incident angle that passes through the through-holes (61, 62, 63) by the reflective layer (100) increases, when the light irradiated from each inorganic light-emitting element (51, 52, 53) is incident on the reflective layer (100) corresponding to the position of the through-hole (61, 62, 63) that does not correspond forward to each inorganic light-emitting element (51, 52, 53), the light is totally reflected at the incident surface of the reflective layer (100) and is not able to pass through the reflective layer (100) and is reflected toward the mounting surface (41) to be absorbed by the anisotropic conductive layer (47).

[0111] When the area disposed in the position corresponding to the first through hole (61) in the front of the reflective layer (100) is defined as the first area (110), the area disposed in the position corresponding to the second through hole (62) in the front is defined as the second area (120), and the area disposed in the position corresponding to the third through hole (63) in the front is defined as the third area (130), when light (R2) irradiated from the red light emitting element (51) is incident on the second area (120), it is totally reflected on the second area (120) and does not pass through the reflective layer (100), but moves toward the mounting surface (41) and can be absorbed by the two-way conductive layer (47).

[0112] However, the light irradiated from the green light-emitting element (52) is not limited thereto, and when it is incident on the first region (110) or the third region (130), it is totally reflected on the first region (110) or the third region (130), and does not pass through the reflection layer (100), but moves toward the mounting surface (41) and can be absorbed by the two-way conductive layer (47).

[0113] When light irradiated from the red light-emitting element (51) is incident on the first region (110), the red light-emitting element (51) and the first region (110) are arranged in positions corresponding to each other in the vertical direction, so that the angle of incidence when light transmitted from the red light-emitting element (51) is incident on the first region (110) is set very small, so that light (R1) irradiated from the red light-emitting element (51) can easily transmit through the first region (110) and pass through the first through hole (61).

[0114] However, when the light (R2) irradiated from the red light-emitting element (51) is incident on the second region (120), the incident angle at which the light is incident on the second region (120) increases due to the radiation angle from the red light-emitting element (51), so that the light (R2) irradiated from the red light-emitting element (51) on the second region (120) is reflected and moves toward the mounting surface (41) and can be absorbed by the anisotropic conductive layer (47).

[0115] In addition, when light (R3) irradiated from the red light-emitting element (51) is directly incident on the third region (130) or is reflected between the mirror layer (100) and the anisotropic conductive layer (47) and is incident on the third region (130), as the incident angle at which light (R3) is incident on the third region (130) increases due to the radiation angle from the red light-emitting element (51), the light (R3) irradiated from the red light-emitting element (51) on the third region (130) is reflected and moves toward the mounting surface (41) and can be absorbed by the anisotropic conductive layer (47).

[0116] Accordingly, the light irradiated from each inorganic light-emitting element (51, 52, 53) is incident on the first region (110), the second region (120), and the third region (130) arranged at positions corresponding to the front of each inorganic light-emitting element (51, 52, 53), and can pass through the reflection layer (100) without being reflected and through the through hole (61, 62, 63).

[0117] At the same time, when light irradiated from the inorganic light-emitting elements (51, 52, 53) is incident on the first region (110), the second region (120), and the third region (130) positioned at positions corresponding to the front of each inorganic light-emitting element (51, 52, 53) and any other region (110, 120, 130), it is totally reflected at the incident surface of the reflective layer (100) and cannot pass through the through hole (61, 62, 63).

[0118] Accordingly, each through hole (61, 62, 63) can be arranged so that only light irradiated from the inorganic light emitting element (51, 52, 53) corresponding to each through hole (61, 62, 63) in the vertical direction is transmitted.

[0119] While the technical concept of the present invention has been described above through specific examples, the scope of the present invention is not limited to these examples. Various embodiments that can be modified or altered by those skilled in the art without departing from the spirit of the present invention as defined in the claims are also within the scope of the present invention.

Claims

1. A plurality of inorganic light-emitting elements that radiate light forward; A substrate having a mounting surface on which the plurality of inorganic light-emitting elements are mounted; A front cover provided to cover the mounting surface of the above substrate from the front; A mirror layer disposed between the front cover and the plurality of inorganic light-emitting elements; A reflective layer disposed between the mirror layer and the plurality of inorganic light-emitting elements and configured to reflect at least a portion of light irradiated from the plurality of inorganic light-emitting elements; An adhesive layer disposed between the reflective layer and the mounting surface and configured to adhere the reflective layer to the mounting surface; A display module in which the above reflective layer is arranged to reflect at least a portion of light irradiated from the plurality of inorganic light-emitting elements according to a difference in refractive index with respect to the above adhesive layer.

2. In paragraph 1, A display module in which the refractive index of the adhesive layer is set to be greater than the refractive index of the reflective layer.

3. In paragraph 1, A display module in which the above adhesive layer is made of optical clear resin (OCR).

4. In paragraph 1, A display module in which light transmitted through the above reflective layer passes through a through hole formed in the above mirror layer and passes through the front cover to be displayed in the front.

5. In paragraph 1, It further includes a TFT layer (Thin Film Transistor) formed on the above mounting surface, and an anisotropic conductive layer electrically connecting the TFT layer and the plurality of inorganic light-emitting elements and disposed on the upper surface of the TFT layer, A display module in which the above anisotropic conductive layer is provided in black.

6. In paragraph 1, The above plurality of inorganic light-emitting elements include a first inorganic light-emitting element and a second inorganic light-emitting element arranged parallel to the first inorganic light-emitting element, The above reflective layer Including a first region corresponding to the first inorganic light-emitting element and a second region corresponding to the second inorganic light-emitting element in the front, A display module provided so that light irradiated from the first inorganic light-emitting element is transmitted through the reflective layer when incident on the first region.

7. In paragraph 7, A display module in which the above reflective layer is provided so that light irradiated from the first inorganic light-emitting element is reflected when incident on the second region.

8. In paragraph 7, It further includes a TFT layer (Thin Film Transistor) formed on the above mounting surface, and an anisotropic conductive layer electrically connecting the TFT layer and the plurality of inorganic light-emitting elements and being arranged on the upper surface of the TFT layer and having a black color, A display module in which the reflected light is arranged to be incident on the anisotropic conductive layer.

9. In paragraph 6, The above plurality of inorganic light-emitting elements include a third inorganic light-emitting element arranged parallel to the first inorganic light-emitting element and the second inorganic light-emitting element, The above reflective layer A third area corresponding to the third inorganic light-emitting element in the front A display module in which light irradiated from the first inorganic light-emitting element and the second inorganic light-emitting element is reflected when incident on the third region.

10. In paragraph 4, A display module in which the above mirror layer is provided so that light does not transmit through an area outside the through hole of the above mirror layer.

11. A plurality of inorganic light-emitting elements that irradiate light forward; A substrate having a mounting surface on which the plurality of inorganic light-emitting elements are mounted; A mirror layer spaced apart from the mounting surface of the substrate in the front; A reflective layer disposed between the mirror layer and the plurality of inorganic light-emitting elements and configured to reflect at least a portion of light irradiated from the plurality of inorganic light-emitting elements; An adhesive layer disposed between the reflective layer and the mounting surface and configured to adhere the reflective layer to the mounting surface; A display module in which the refractive index of the adhesive layer is set to be greater than the refractive index of the reflective layer.

12. In paragraph 11, It further includes a TFT layer (Thin Film Transistor) formed on the above mounting surface, and an anisotropic conductive layer electrically connecting the TFT layer and the plurality of inorganic light-emitting elements and disposed on the upper surface of the TFT layer, A display module in which the above anisotropic conductive layer is formed in a black color.

13. In paragraph 12, The above plurality of inorganic light-emitting elements include a first inorganic light-emitting element and a second inorganic light-emitting element arranged parallel to the first inorganic light-emitting element, The above reflective layer Including a first region corresponding to the first inorganic light-emitting element and a second region corresponding to the second inorganic light-emitting element in the front, A display module provided so that light irradiated from the first inorganic light-emitting element is transmitted through the reflective layer when incident on the first region.

14. In paragraph 13, A display module in which the above reflective layer is provided so that light irradiated from the first inorganic light-emitting element is reflected when incident on the second region.

15. In paragraph 14, A display module in which the reflected light is arranged to be incident on the anisotropic conductive layer.

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