Inorganic light-emitting element and display module including same

Abstract

This display module may include a substrate and an inorganic light-emitting element on the substrate. The inorganic light-emitting element may comprise: an active layer for generating light of a first color; a light-emitting surface spaced apart from the active layer; a notch part having notches formed in the light-emitting surface; and a quantum dot (QD) layer which is located at the notch part and which converts, into light of a second color, the light of the first color generated from the active layer. The display module may further include a color filter which corresponds to the inorganic light-emitting element and which absorbs the light of the first color emitted from the inorganic light-emitting element.

Description

Inorganic light-emitting element and display module including the same

[0001] Embodiments of the present disclosure relate to an inorganic light-emitting device and a display module including the same.

[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 a backlight, or OLED (Organic Light-Emitting Diode) panels, which are made of a film of organic compounds that emit light on their own in response to current, are used as display devices. However, LCDs have slow response times, consume a lot of power, and are not self-luminous, requiring a backlight, making it difficult to make LCD panels compact. Furthermore, OLED panels do not require a backlight because they are self-luminous, and can be made thin. However, if the same screen is displayed for a long time, it is vulnerable to burn-in (deterioration), where certain parts of the previous screen remain even when the screen is changed as the subpixels reach their lifespan. 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 a type of flat panel display panel composed of a plurality of inorganic light-emitting diodes (inorganic LEDs), each of which is 100 micrometers or less in size.

[0005] Although these LED panels are self-luminous, they do not suffer from the burn-in phenomenon of OLEDs and have superior 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. While both organic light-emitting diodes (OLEDs) and MicroLEDs are energy efficient, MicroLEDs 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 embodiment of the present disclosure provides an inorganic light-emitting device with improved light efficiency and a display module including the same.

[0009] One embodiment of the present disclosure provides an inorganic light-emitting element with improved color conversion efficiency and a display module including the same.

[0010] One embodiment of the present disclosure provides an inorganic light-emitting element capable of reducing and / or preventing light loss and a display module including the same.

[0011] Aspects of the embodiments of the present disclosure are not limited to the aspects mentioned above, and other aspects not mentioned will be clearly understood by those skilled in the art to which the present disclosure pertains from the description below.

[0012] According to embodiments of the present disclosure, a display module may include: a substrate; an inorganic light-emitting element on the substrate; and a color filter corresponding to the inorganic light-emitting element. The inorganic light-emitting element may include: an active layer configured to generate light having a first color; a light-emitting surface spaced apart from the active layer; a groove portion having grooves sunken in the light-emitting surface; and a quantum dot (QD) layer located in the groove portion and configured to convert light having the first color generated from the active layer into a second color. The color filter may be configured to absorb light having the first color emitted from the inorganic light-emitting element.

[0013] According to embodiments of the present disclosure, an inorganic light-emitting device may include: a first semiconductor including a light-emitting surface; a second semiconductor spaced apart from the first semiconductor; an active layer between the first semiconductor and the second semiconductor and configured to generate light; a groove portion including a plurality of grooves sunken in the light-emitting surface; and a QD layer within the groove portion. The QD layer may be configured to convert a color of light generated by the active layer from a first color to a second color.

[0014] FIG. 1 is a drawing illustrating a display device according to one embodiment.

[0015] FIG. 2 is a diagram illustrating the components of a display device according to one embodiment.

[0016] FIG. 3 is an enlarged cross-sectional view illustrating a portion of a display module according to one embodiment.

[0017] Fig. 4 is an enlarged cross-sectional view of the inorganic light-emitting element illustrated in Fig. 3.

[0018] Fig. 5 is a cross-sectional view showing an example of an inorganic light-emitting element.

[0019] Fig. 6 is a cross-sectional view showing an example of an inorganic light-emitting element.

[0020] Fig. 7 is a cross-sectional view showing an example of an inorganic light-emitting element.

[0021] Fig. 8 is a cross-sectional view showing an example of an inorganic light-emitting element.

[0022] Fig. 9 is a cross-sectional view showing an example of an inorganic light-emitting element.

[0023] Fig. 10 is a cross-sectional view showing an example of an inorganic light-emitting element.

[0024] Fig. 11 is a cross-sectional view showing an example of an inorganic light-emitting element.

[0025] Fig. 12 is a cross-sectional view showing an example of an inorganic light-emitting element.

[0026] Figure 13 is an enlarged cross-sectional view showing an example of an inorganic light-emitting element.

[0027] It should be understood that the examples and terms of the embodiments described in this disclosure are not intended to limit the scope of the present disclosure to specific embodiments, but rather encompass various modifications, equivalents, and / or alternatives of the exemplary embodiments.

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

[0029] 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.

[0030] 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.

[0031] The term "and / or" includes any combination of a plurality of related described elements or any one of a plurality of related described elements.

[0032] The terms "part," "module," and "member" may be implemented in hardware or software. Depending on the embodiments, multiple "parts," "modules," or "members" may be implemented as a single component, or a single "part," "module," or "member" may include multiple components.

[0033] 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).

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] The term "identical" encompasses similar properties or similarities within a certain range. Furthermore, "identical" also means "substantially identical." "Substantially identical" should be understood to include values ​​within the manufacturing tolerance range or values ​​that differ from the reference value by a range that is insignificant.

[0039] Meanwhile, the terms "front", "back", "left", "right", "up", "down", etc. used in the following description are defined based on the drawing, and the shape and position of each component are not limited by these terms. For example, with respect to the display device (1) illustrated in FIG. 1, the direction in which an image is displayed may be defined as the front (+X direction), and the side opposite to the front may be defined as the rear (-X direction). For example, the front (+X direction) may be substantially the same as the light-emitting direction of each of the plurality of inorganic light-emitting elements.

[0040] In the drawing, some components of the display device (1), including a plurality of inorganic light-emitting elements (50), are micro-unit components having a size of several μm to several hundred μm, and for convenience of explanation, the scale of some components (e.g., a plurality of inorganic light-emitting elements (50), anisotropic conductive layer (60), color filter (70), black matrix (80), etc.) may be exaggerated.

[0041] FIG. 1 is a diagram illustrating a display device according to one embodiment. FIG. 2 is a diagram illustrating components of a display device according to one embodiment in an exploded manner.

[0042] 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 television (TV), personal computer (PC), mobile device, digital signage, etc. can be implemented as a display device (1).

[0043] The display device (1) may include a display panel (20) that displays an image. The display device (1) may include a power supply that supplies power to the display panel (20). The display device (1) may include a main board (25) that controls the overall operation of the display panel (20).

[0044] The display panel (20) may be configured to display an image on the front surface. The display panel (20) may include a plurality of inorganic light-emitting elements (50). A detailed description of the plurality of inorganic light-emitting elements (50) will be provided later.

[0045] The display panel (20) may include a plurality of display modules (30A-30P). The display panel (20) may include a driving board that drives each of the display modules (30A-30P). The display panel (20) may include a TOCN board (Timing controller board) that generates a timing signal for controlling each of the display modules (30A-30P).

[0046] A plurality of display modules (30A-30P) can be arranged vertically, horizontally, and horizontally so as to be adjacent to each other. A plurality of display modules (30A-30P) can be arranged in a matrix form of M * N. In FIGS. 1 and 2, 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.

[0047] The display device (1) can implement a large screen by tiling a plurality of display modules (30A-30P).

[0048] As illustrated in FIGS. 1 and 2, a plurality of display modules (30A-30P) can be applied to display devices such as monitors for personal computers (PCs), high-resolution TVs, signage, electronic displays, etc. through a plurality of assembly arrangements in a matrix type.

[0049] Unlike those illustrated in FIGS. 1 and 2 , each of the plurality of display modules (30A-30P) may be applied to a display device. That is, the display modules (30A-30P) may be installed and applied as a single unit in electronic products or battlefields including wearable devices, portable devices, handheld devices, and various displays. For example, the display panel (20) may include a single display module.

[0050] For example, each of the display modules (30A-30P) may be formed in a quadrangle type. For example, each of the display modules (30A-30P) may be formed in a rectangular (rectangle type) shape or a square (square type) shape.

[0051] For example, a plurality of display modules (30A-30P) can be installed on a frame (15). The plurality of display modules (30A-30P) can be installed on the frame (15) through various methods, such as magnetic force using a magnet or a mechanical fitting structure. For example, the frame (15) can also be provided as a component of a case (10) to be described later.

[0052] Meanwhile, multiple display modules (30A-30P) may have identical configurations. Accordingly, the description of any one display module described below may be equally applied to all other display modules.

[0053] The display device (1) may include a case (10). The case (10) may support a display panel (20). The case (10) may accommodate at least a portion of the display panel (20). The case (10) may cover the rear of the display panel (20). The case (10) may form the rear exterior of the display device (1).

[0054] For example, the case (10) can be installed on the floor by a stand (not shown) or installed on the wall by a hanger (not shown).

[0055] For example, the case (10) may be provided in the form of an assembly in which a plurality of configurations are combined.

[0056] For example, the case (10) may include a metal material. Accordingly, heat generated from the display panel (20) can be easily conducted to the case (10), thereby increasing the heat dissipation efficiency of the display device (1).

[0057] The case (10) may be referred to as a chassis, mold, rear cover, etc.

[0058] Fig. 3 is an enlarged cross-sectional view illustrating a portion of a display module according to one embodiment. Fig. 4 is an enlarged cross-sectional view illustrating the inorganic light-emitting element illustrated in Fig. 3.

[0059] Hereinafter, the description of the display module (30) corresponds to the description of any one of the plurality of display modules (30A-30P). Accordingly, the description of the display module (30) can be applied to each of the plurality of display modules (30A-30P). Similarly, the description of the configurations of the display module (30) can be applied to the configurations of each of the plurality of display modules (30A-30P). In addition, hereafter, the description of the inorganic light-emitting element (50) corresponds to the description of any one of the plurality of inorganic light-emitting elements (50) and the description of the common features of the plurality of inorganic light-emitting elements (50). That is, the description of the inorganic light-emitting element (50) can of course be applied to each of the plurality of inorganic light-emitting elements (50).

[0060] Referring to FIGS. 3 and 4, the display module (30) 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 the mounting surface (41) of the substrate (40) facing in the first direction (+ X direction). In FIGS. 3 and 4, the thickness of the substrate (40) in the first direction (+ X direction) is shown exaggeratedly for convenience of explanation.

[0061] The substrate (40) may be provided to support a plurality of inorganic light-emitting elements (50). The substrate (40) may be electrically connected to the plurality of inorganic light-emitting elements (50). For example, the substrate (40) may be provided to control each of the plurality of inorganic light-emitting elements (50). For example, the substrate (40) may enable communication between the plurality of inorganic light-emitting elements (50).

[0062] For example, the substrate (40) may be implemented as various substrates such as a thin film transistor (TFT) substrate, a printed circuit board (PCB) substrate, a flexible printed circuit board (FPCB) substrate, a complementary metal oxide semiconductor (CMOS) substrate, etc. For example, the substrate (40) may include various components such as pad electrodes, wiring, circuit elements, etc. However, the embodiments of the present disclosure are not limited to the above-described examples, and the substrate (40) may be provided as various types of substrates as long as it can be electrically connected to a plurality of inorganic light-emitting elements (50).

[0063] As described above, the plurality of display modules (30A-30P) may each be provided in a rectangular shape, and the substrate (40) may be formed in a quadrangle type to correspond thereto. For example, the substrate (40) may be provided in a rectangular (rectangle type) shape or a square (square type) shape.

[0064] The substrate (40) may include a substrate body (42). The substrate body (42) may include a mounting surface (41) on which a plurality of inorganic light-emitting elements (50) are mounted. The mounting surface (41) may be provided as one surface of the substrate body (42). The substrate body (42) may include a rear surface (43) formed on an opposite side of the substrate body (42) from the mounting surface (41). The rear surface (43) may be provided as the other surface of the substrate body (42).

[0065] The mounting surface (41) may be provided to face a plurality of inorganic light-emitting elements (50). The mounting surface (41) may be provided to face a cover (90) to be described later. The mounting surface (41) may be provided to face a black matrix (80) to be described later. The mounting surface (41) may be provided to face a color filter (70) to be described later. The rear surface (43) may be provided to face the case (10).

[0066] For example, the substrate body (42) may include a glass substrate. For example, the substrate body (42) may be formed of a silicon wafer. However, the embodiments of the present disclosure are not limited to the above-described examples, and the substrate body (42) may be formed of various materials.

[0067] The substrate (40) may include a driving layer (44). The driving layer (44) may be provided to drive a plurality of inorganic light-emitting elements (50). The driving layer (44) may be provided to drive each of the plurality of inorganic light-emitting elements (50). The driving layer (44) may be provided to individually drive the plurality of inorganic light-emitting elements (50). The driving layer (44) may be formed on the substrate body (42). The driving layer (44) may be formed on one side of the substrate body (42). The driving layer (44) may be formed on the mounting surface (41) of the substrate body (42).

[0068] For example, the driving layer (44) may include a TFT (Thin Film Transistor). For example, the driving layer (44) may include at least one of an LTPS (Low Temperature Poly Silicon) TFT, an oxide TFT, an amorphous-silicon TFT, a zinc oxide TFT, an organic TFT, and a graphene TFT. However, the embodiments of the present disclosure are not limited to the above-described examples, and the TFT constituting the driving layer (44) is not limited to a specific structure or type and may include various configurations. When the driving layer (44) includes a TFT, the driving layer (44) may be referred to as a TFT layer.

[0069] For example, when the substrate body (42) of the substrate (40) is made of a silicon wafer, the driving layer (44) can be replaced with a CMOS (Complementary Metal-Oxide Semiconductor) type or n-type MOSFET or p-type MOSFET transistor.

[0070] The substrate (40) may include a first pad electrode (45a) and a second pad electrode (45b). The first pad electrode (45a) and the second pad electrode (45b) may be formed on the mounting surface (41) side of the substrate (40). The first pad electrode (45a) and the second pad electrode (45b) may be electrically connected to the driving layer (44). The first pad electrode (45a) and the second pad electrode (45b) may be provided to correspond to the first contact electrode (54a) and the second contact electrode (54b), which will be described later, respectively. As the first pad electrode (45a) and the second pad electrode (45b) are electrically connected to the first contact electrode (54a) and the second contact electrode (54b), respectively, the inorganic light emitting element (50) and the driving layer (44) may be electrically connected.

[0071] The substrate (40) may further include a light absorbing layer (46) to absorb external light and improve contrast. The light absorbing layer (46) may be provided on the mounting surface (41) side of the substrate (40). For example, the light absorbing layer (46) may be provided between the driving layer (44) and the anisotropic conductive layer (60) described below.

[0072] The plurality of inorganic light-emitting elements (50) may include inorganic light-emitting elements (50) formed of an inorganic material and having a width, length, and height of several μm to several tens of μm, respectively. For example, the inorganic light-emitting element (50) may have a size in which a short side among the width, length, and height is 100 μm or less. For example, the inorganic light-emitting element (50) may be picked up from a sapphire or silicon wafer and transferred to a substrate (40). For example, the inorganic light-emitting element (50) may be picked up and transferred through various methods, such as an electrostatic method using an electrostatic head or a stamp method using an elastic polymer material such as polydimethylsiloxane (PDMS) or silicone as a head. However, the embodiments of the present disclosure are not limited to the above-described examples, and the inorganic light-emitting element (50) may be mounted on the substrate (40) through various methods.

[0073] The inorganic light-emitting device (50) may include an active layer (53) that generates light. The light generated from the active layer (53) may have a first color. The active layer (53) may include a material that emits light by recombination of electrons and holes. The active layer (53) may be arranged between a first semiconductor (51) and a second semiconductor (52), which will be described later. The active layer (53) may be formed between the first semiconductor (51) and the second semiconductor (52), which will be described later.

[0074] For example, the active layer (53) can generate light of various colors depending on the material of the inorganic light-emitting element (50). For example, when the inorganic light-emitting element (50) includes GaN (Gallium Nitride), the active layer (53) can emit blue light. However, the embodiments of the present disclosure are not limited to the above-described example. The inorganic light-emitting element (50) can include various materials, and accordingly, the active layer (53) can generate light of various colors.

[0075] The inorganic light-emitting element (50) may include a first semiconductor (51) and a second semiconductor (52). The first semiconductor (51) and the second semiconductor (52) may be disposed with an active layer (53) therebetween. The second semiconductor (52) may be spaced apart from the first semiconductor (51). For example, the first semiconductor (51) may include a light-emitting surface (55) to be described later. For example, the second semiconductor (52) may include a bottom surface (56) to be described later. However, the embodiments of the present disclosure are not limited thereto. For example, a protective layer may be provided on the first semiconductor (51), and the protective layer provided on the first semiconductor (51) may include a light-emitting surface (55).

[0076] One of the first semiconductor (51) and the second semiconductor (52) may be an n-type semiconductor, and the other of the first semiconductor (51) and the second semiconductor (52) may be a p-type semiconductor. Electrons may exist in one of the first semiconductor (51) and the second semiconductor (52), and holes may exist in the other of the first semiconductor (51) and the second semiconductor (52). Light may be generated while these electrons and holes recombine in the active layer (53).

[0077] The inorganic light-emitting element (50) may include a light-emitting surface (55). The inorganic light-emitting element (50) may include a bottom surface (56) disposed on the opposite side of the inorganic light-emitting element (50) from the light-emitting surface (55).

[0078] The light-emitting surface (55) can be spaced apart from the active layer (53). When the inorganic light-emitting element (50) is mounted on the substrate (40), the light-emitting surface (55) can be arranged toward the first direction (X direction). The light-emitting surface (55) can be arranged to face the color filter (70). The light-emitting surface (55) can emit light toward the color filter (70). The light-emitting surface (55) can emit light toward the cover (90).

[0079] The inorganic light-emitting element (50) may include a first contact electrode (54a) and a second contact electrode (54b). The first contact electrode (54a) and the second contact electrode (54b) may be provided to correspond to the first pad electrode (45a) and the second pad electrode (45b), respectively. The first contact electrode (54a) and the second contact electrode (54b) may be electrically connected to the first pad electrode (45a) and the second pad electrode (45b), respectively. As a result, the inorganic light-emitting element (50) and the driving layer (44) of the substrate (40) may be electrically connected.

[0080] According to embodiments of the present disclosure, one of the first contact electrode (54a) and the second contact electrode (54b) may be electrically connected to the first semiconductor (51), and the other of the first contact electrode (54a) and the second contact electrode (54b) may be electrically connected to the second semiconductor (52).

[0081] The first contact electrode (54a) and the second contact electrode (54b) may be formed on the opposite side (e.g., the bottom surface (56)) of the inorganic light-emitting element (50) from the light-emitting surface (55). The first contact electrode (54a) and the second contact electrode (54b) may be arranged to face the opposite direction (-X direction) to the direction in which light is irradiated (+X direction). The first contact electrode (54a) and the second contact electrode (54b) may be arranged to face the substrate (40).

[0082] Accordingly, when light is irradiated toward the color filter (70) through the light-emitting surface (55), the light can be irradiated without interference with the first contact electrode (54a) and / or the second contact electrode (54b).

[0083] For example, the first contact electrode (54a) and the second contact electrode (54b) may be in the form of a flip chip that is arranged horizontally and facing the same direction (opposite to the light-emitting direction).

[0084] The display module (30) may include an anisotropic conductive layer (60) that is provided to electrically connect the inorganic light-emitting element (50) and the substrate (40). The anisotropic conductive layer (60) may electrically connect the inorganic light-emitting element (50) and the driving layer (44). The anisotropic conductive layer (60) may electrically connect the first contact electrode (54a) and the second contact electrode (54b) of the inorganic light-emitting element (50) to the first pad electrode (45a) and the second pad electrode (45b) of the substrate (40).

[0085] The anisotropic conductive layer (60) may have a structure in which an anisotropic conductive adhesive is attached on a protective film and conductive balls (61) are dispersed in an adhesive resin (62). The conductive balls (61) 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.

[0086] For example, the anisotropic conductive layer (60) may be provided as an anisotropic conductive film (ACF) in the form of a film. For example, the anisotropic conductive layer (60) may be provided as an anisotropic conductive paste (ACP) in the form of a paste.

[0087] However, the embodiments of the present disclosure are not limited to the above-described ones, and various bonding methods may be used to electrically connect the inorganic light-emitting element (50) and the substrate (40). For example, the anisotropic conductive layer (60) may be replaced with various bonding configurations such as solder.

[0088] The display module (30) may include a color filter (CF) (70). The color filter (70) may be provided to correspond to the inorganic light-emitting element (50). The inorganic light-emitting element (50) may irradiate light toward the color filter (70). For example, the color filter (70) may be provided in a plurality of configurations, or may be provided in a single configuration including a plurality of filter areas each corresponding to various colors. A detailed description of the color filter (70) will be provided later.

[0089] The display module (30) may include a black matrix (BM) (80). The black matrix (80) may have a black color. For example, the black matrix (80) may be arranged between a plurality of color filters, or may be provided as a single component of a color filter (70) and arranged between a plurality of filter regions. A detailed description of the black matrix (80) will be provided later.

[0090] The display module (30) may include a cover (90). The cover (90) may include a first cover surface (91). The cover (90) may include a second cover surface (92) formed on an opposite side of the cover (90) from the first cover surface (91). The first cover surface (91) may form the front surface of the display module (30). The second cover surface (92) may be provided to face a plurality of inorganic light-emitting elements (50). The first cover surface (91) of the cover (90) may be referred to as the front surface of the cover (90), and the second cover surface (92) of the cover (90) may be referred to as the back surface of the cover (90).

[0091] Light emitted from multiple inorganic light-emitting elements (50) is incident on the cover (90) through the second cover surface (92), and light incident on the cover (90) can be emitted to the front outside of the display module (30) through the first cover surface (91).

[0092] A cover (90) may be provided to cover a plurality of inorganic light-emitting elements (50). The cover (90) may protect the plurality of inorganic light-emitting elements (50). For example, the cover (90) may protect the plurality of inorganic light-emitting elements (50) from external force, external moisture, external foreign substances, etc.

[0093] A cover (90) may be provided to cover the substrate (40). The cover (90) may protect the substrate (40). For example, the cover (90) may protect the substrate (40) from external force, external moisture, external foreign substances, etc.

[0094] For example, the cover (90) may include glass. For example, the cover (90) may include a functional film having optical properties. For example, the cover (90) may be provided in multiple layers. However, the embodiments of the present disclosure are not limited to the examples described above, and the cover (90) may include various materials and / or structures.

[0095] Next, with reference to FIGS. 3 and 4, the pixel structure and / or arrangement of the display module (30) will be described. Hereinafter, for convenience of explanation, an example of an inorganic light-emitting element (50) including an active layer (53) that generates blue light may be described.

[0096] A plurality of inorganic light-emitting elements (50) may include a red light-emitting element (50a), a green light-emitting element (50b), and a blue light-emitting element (50c). A series of red light-emitting elements (50a), green light-emitting elements (50b), and blue light-emitting elements (50c) may be mounted on a substrate (40) as a single unit. A series of red light-emitting elements (50a), green light-emitting elements (50b), and blue light-emitting elements (50c) may form a single pixel. At this time, the red light-emitting element (50a), the green light-emitting element (50b), and the blue light-emitting element (50c) may each form a sub-pixel.

[0097] For example, a red light-emitting element (50a), a green light-emitting element (50b), and a blue light-emitting element (50c) may be arranged in a row. For example, a green light-emitting element (50b) may be spaced apart from a red light-emitting element (50a). For example, a blue light-emitting element (50c) may be spaced apart from a green light-emitting element (50b). For example, a red light-emitting element (50a), a green light-emitting element (50b), and a blue light-emitting element (50c) may also be arranged in a shape other than that illustrated in the drawing, such as a triangle shape.

[0098] The red light-emitting element (50a), the green light-emitting element (50b), and the blue light-emitting element (50c) may be referred to as a first inorganic light-emitting element, a second inorganic light-emitting element, and a third inorganic light-emitting element, respectively. However, the ordinal numbers "first," "second," and "third" do not limit the configuration.

[0099] Some of the plurality of inorganic light-emitting elements (50) may have a different structure from other some of the plurality of inorganic light-emitting elements (50). For example, the structure of a blue light-emitting element (50c) may be different from the structure of a red light-emitting element (50a). For example, the structure of a blue light-emitting element (50c) may be different from the structure of a green light-emitting element (50b).

[0100] The blue light-emitting element (50c) can emit light without converting the color of light generated from the active layer (53). The blue light-emitting element (50c) can emit blue light.

[0101] The red light-emitting element (50a) and the green light-emitting element (50b) can each convert and emit the color of light generated from the active layer (53). For example, the red light-emitting element (50a) can convert blue light into red light. For example, the green light-emitting element (50b) can convert blue light into green light. An inorganic light-emitting element (50) that can convert the color of light generated from the active layer (53), such as the red light-emitting element (50a) and the green light-emitting element (50b), can be referred to as a color conversion element. The color conversion element corresponds to an example of an inorganic light-emitting element (50) and can be referred to as an inorganic light-emitting element (50). Next, an example of an inorganic light-emitting element (50) capable of color conversion will be described.

[0102] The inorganic light-emitting element (50) may include a groove (57) formed in the light-emitting surface (55). The groove (57) may be recessed in the light-emitting surface (55). The groove (57) may include a plurality of grooves. The groove (57) may include at least one groove. For example, the groove (57) may be formed by etching.

[0103] For example, the groove (57) may be formed in the first semiconductor (51), and the depth of each of the plurality of grooves may be smaller than the thickness of the first semiconductor (51).

[0104] Since the inorganic light-emitting element (50) has a groove (57), the light efficiency of the inorganic light-emitting element (50) can be improved. For example, when light generated from the active layer (53) is irradiated to the groove (57), it may not be easily totally reflected. That is, the rate at which light generated from the active layer (53) is totally reflected and extinguished within the inorganic light-emitting element (50) can be reduced, and the light extraction rate of the inorganic light-emitting element (50) can be increased.

[0105] The inorganic light-emitting element (50) may include a QD (Quantum Dot) layer (58) provided in a groove (57). The QD layer (58) may be disposed within the groove (57). The QD layer (58) may be filled within the groove (57). The QD layer (58) may be provided to cover the groove (57). The QD layer (58) may be provided to cover the light-emitting surface (55). The QD layer (58) may be provided to cover the groove (57) and the light-emitting surface (55) (see FIGS. 6, 8, 10, and 12).

[0106] The QD layer (58) may be provided to convert light having a first color generated from the active layer (53) into a second color. The QD layer (58) may be provided to convert the color of light generated from the active layer (53) from the first color to a second color. The second color corresponds to a color different from the first color. That is, light generated from the active layer (53) may be color-converted as it passes through the QD layer (58). The QD layer (58) may include quantum dots. The color to be converted may vary depending on the size of the quantum dots of the QD layer (58).

[0107] For example, a red light-emitting device (50a) may include a QD layer (58a) capable of converting blue light into red light. A green light-emitting device (50b) may include a QD layer (58b) capable of converting blue light into green light. The quantum dot size of the QD layer (58a) of the red light-emitting device (50a) may be different from the quantum dot size of the QD layer (58b) of the green light-emitting device (50b). For example, the quantum dot size of the QD layer (58a) of the red light-emitting device (50a) may be larger than the quantum dot size of the QD layer (58b) of the green light-emitting device (50b).

[0108] The color conversion efficiency of the inorganic light-emitting device (50) can be improved by including a QD layer (58). The inorganic light-emitting device (50) can emit various colors through the QD layer (58). The inorganic light-emitting device (50) can emit various colors by varying the type of the QD layer (58).

[0109] However, the QD layer (58) may be replaced with a configuration including a color conversion material other than quantum dots so as to convert the color of light generated from the active layer (53). That is, the description of the QD layer (58) described above (excluding quantum dots) can of course be applied to an alternative configuration of the QD layer (58). The QD layer (58) may be referred to as a color conversion layer.

[0110] The inorganic light-emitting element (50) may include a dichroic filter (59). The dichroic filter (59) may be provided to cover the light-emitting surface (55). The dichroic filter (59) may be provided to cover the QD layer (58). The dichroic filter (59) may be provided to cover the light-emitting surface (55) and the QD layer (58).

[0111] The dichroic filter (59) may be provided to reflect light having a predetermined wavelength range. The dichroic filter (59) may be provided to reflect light having a first color emitted through at least one of the light-emitting surface (55) and the QD layer (58). The dichroic filter (59) may reflect light having a first color among light emitted through at least one of the light-emitting surface (55) and the QD layer (58). The dichroic filter (59) may transmit light having a second color among light emitted through at least one of the light-emitting surface (55) and the QD layer (58). For example, the dichroic filter (59) may include a plurality of layers having different refractive indices.

[0112] The light of the first color generated from the active layer (53) may be converted to the second color while passing through the QD layer (58), but may not be converted to 100% even when passing through the QD layer (58). In addition, the light of the first color generated from the active layer (53) may be emitted through the light-emitting surface (55) without passing through the QD layer (58). Accordingly, light having the first color may be emitted from at least one of the light-emitting surface (55) and the QD layer (58). Light having the first color may leak out from at least one of the light-emitting surface (55) and the QD layer (58).

[0113] The dichroic filter (59) can recycle the light having the first color emitted from the light-emitting surface (55) and / or the QD layer (58) by reflecting the light that has not been color-converted. That is, the light having the first color emitted from the light-emitting surface (55) and / or the QD layer (58) can be reflected by the dichroic filter (59). The light reflected by the dichroic filter (59) can pass through the QD layer (58). The dichroic filter (59) can allow the light that has passed through the QD layer (58) but has not been color-converted to pass through the QD layer (58) again. The dichroic filter (59) can allow the light that has not passed through the QD layer (58) and has not been color-converted to pass through the QD layer (58). The dichroic filter (59) can reduce and / or remove noise of the light emitted from the inorganic light-emitting element (50). A dichroic filter (59) can improve the color conversion efficiency of an inorganic light-emitting element (50). The color reproducibility of a display module (30) can be excellent.

[0114] For example, the dichroic filter (59) of the red light-emitting element (50a) can reflect blue light. For example, the dichroic filter (59) of the red light-emitting element (50a) can transmit red light.

[0115] For example, the dichroic filter (59) of the green light-emitting element (50b) can reflect blue light. For example, the dichroic filter (59) of the green light-emitting element (50b) can transmit green light.

[0116] Although the dichroic filter (59) was described above as a component of the inorganic light-emitting element (50), the embodiments of the present disclosure are not limited thereto. The dichroic filter (59) may be provided as a separate component from the inorganic light-emitting element (50) and may be placed on the light-emitting side of the inorganic light-emitting element (50).

[0117] The color filter (70) may be arranged to correspond to the inorganic light-emitting element (50). The color filter (70) may be arranged to face the light-emitting surface (55) of the inorganic light-emitting element (50). The color filter (70) may be arranged to face the dichroic filter (59).

[0118] The color filter (70) may be provided to absorb light having a predetermined wavelength range. The color filter (70) may be provided to absorb light having a first color emitted from the inorganic light-emitting element (50). The color filter (70) may absorb light having a first color among the light emitted from the inorganic light-emitting element (50). The color filter (70) may allow light having a second color to pass through the light emitted from the inorganic light-emitting element (50).

[0119] The light of the first color generated from the active layer (53) can be converted to the second color while passing through the QD layer (58). The light of the first color generated from the active layer (53) can be recycled by the dichroic filter (59) and converted while passing through the QD layer (58). However, the light generated from the active layer (53) may be emitted without passing through the QD layer (58), and may be emitted without being 100% converted even if it passes through the QD layer (58) at least once. Accordingly, the light of the first color that has not been converted may be emitted from the inorganic light-emitting element (50). That is, the light having the first color may leak out from the inorganic light-emitting element (50).

[0120] The color filter (70) can absorb non-color-converted light emitted from the inorganic light-emitting element (50). The color filter (70) can prevent non-color-converted light from being irradiated to the cover (90). The color filter (70) can allow only color-converted light to be irradiated to the cover (90). Consequently, the color filter (70) can reduce and / or eliminate noise in the light emitted from the inorganic light-emitting element (50). The color filter (70) can improve the color conversion efficiency of the display module (30). The color reproducibility of the display module (30) can be excellent.

[0121] The display module (30) may include a red filter (71) corresponding to the red light-emitting element (50a). The red filter (71) may be arranged to face the light-emitting surface (55) of the red light-emitting element (50a). The red filter (71) may be provided to transmit red light emitted from the red light-emitting element (50a). The red filter (71) may be provided to absorb light outside the wavelength range of the red light. For example, the red filter (71) may absorb blue light emitted from the red light-emitting element (50a).

[0122] The display module (30) may include a green filter (72) corresponding to the green light-emitting element (50b). The green filter (72) may be arranged to face the light-emitting surface (55) of the green light-emitting element (50b). The green filter (72) may be arranged to transmit green light emitted from the green light-emitting element (50b). The green filter (72) may be arranged to absorb light outside the wavelength range of the green light. For example, the green filter (72) may absorb blue light emitted from the green light-emitting element (50b).

[0123] The display module (30) may include a blue filter (73) corresponding to the blue light-emitting element (50c). The blue filter (73) may be positioned to face the light-emitting surface (55) of the blue light-emitting element (50c). The blue filter (73) may be provided to transmit blue light emitted from the blue light-emitting element (50c). The blue filter (73) may be provided to absorb light outside the wavelength range of the blue light.

[0124] The red filter (71), the green filter (72), and the blue filter (73) may be provided as separate color filters, or at least some of the red filter (71), the green filter (72), and the blue filter (73) may be provided as an integrated color filter. For example, the color filter (70) may be provided as a single layer, and each of the red filter (71), the green filter (72), and the blue filter (73) may be provided as a filter region that transmits red light, a filter region that transmits green light, and a filter region that transmits blue light.

[0125] The red filter (71), the green filter (72), and the blue filter (73) may be referred to as a first color filter, a second color filter, and a third color filter, respectively. However, the ordinal numbers “first,” “second,” and “third” do not limit the configuration.

[0126] A black matrix (80) may be provided between a plurality of color filters. The black matrix (80) may be provided between a plurality of color filter regions of a color filter. The black matrix (80) may be provided between a red filter (71) and a green filter (72). The black matrix (80) may be provided between a green filter (72) and a blue filter (73). According to embodiments of the present disclosure, the black matrix (80) may be provided between a red filter (71) and a blue filter (73).

[0127] The black matrix (80) may be provided to partition a red filter (71) and a green filter (72). The black matrix (80) may be provided to partition a green filter (72) and a blue filter (73). According to embodiments of the present disclosure, the black matrix (80) may be provided to partition a red filter (71) and a blue filter (73).

[0128] According to embodiments of the present disclosure, for example, a black matrix (80) may be formed between pixels formed by a red light-emitting element (50a), a green light-emitting element (50b), and a blue light-emitting element (50c). According to embodiments of the present disclosure, for example, the black matrix (80) may be arranged to partition each of the light-emitting elements (e.g., a red light-emitting element (50a), a green light-emitting element (50b), and a blue light-emitting element (50c)) that are sub-pixels.

[0129] The black matrix (80) can block light from leaking between color filters (or color filter areas). The black matrix (80) can distinguish between each area that emits light from the sub-pixels and other areas. The black matrix (80) can ensure that the light emitted from the sub-pixels is irradiated to an accurate location. As a result, the display module (30) can implement a clear screen.

[0130] The black matrix (80) can perform a function that complements the light absorption layer (46). The black matrix (80) can absorb external light to make the substrate (40) appear black. The black matrix (80) can improve the contrast of the display module (30) screen.

[0131] Embodiments of the present disclosure are not limited to the examples described above with reference to FIGS. 3 and 4. Depending on the type of the inorganic light-emitting element (50), the structure and / or arrangement of the pixels of the display module (30) may be variously provided. For example, based on an inorganic light-emitting element (50) including an active layer (53) that generates red light, a red light-emitting element (50a) may not include a groove (57) and a QD layer (58a), a green light-emitting element (50b) may include a quantum dot for converting red light into green light, and a blue light-emitting element (50c) may include a groove (57) and a QD layer (58) provided in the groove (57) for converting red light into blue light. For example, at least a portion of the active layers (53) of each of the red light-emitting element (50a), the green light-emitting element (50b), and the blue light-emitting element (50c) may be arranged to generate light of different colors, and based on this, the configuration and / or structure of each of the red light-emitting element (50a), the green light-emitting element (50b), and the blue light-emitting element (50c) may also vary.

[0132] Referring to FIGS. 5 to 12, various examples of inorganic light-emitting elements (50) will be described.

[0133] The groove portion (57) may include grooves (5701, 5702, 5703, 5704, 5705, 5706, 5707, 5708, 5709, 5710) that are continuously formed on the light-emitting surface (55). The groove portion (57) may include a plurality of grooves (5701, 5702, 5703, 5704, 5705, 5706, 5707, 5708, 5709, 5710) that are sunken in the light-emitting surface (55). For example, the plurality of grooves may be formed on the light-emitting surface (55). For example, the plurality of grooves may be formed in a kind of pattern on the light-emitting surface (55). For example, the plurality of grooves may be provided in a regular or irregular pattern on the light-emitting surface (55). For example, the plurality of grooves may be arranged along a direction (Y direction) that roughly intersects the direction in which the inorganic light-emitting element (50) emits light. For example, the plurality of grooves may be arranged to be spaced apart from each other. For example, at least some of the plurality of grooves may be arranged to be in contact with each other without being spaced apart from each other.

[0134] Although the drawing shows that there are ten grooves (5701, 5702, 5703, 5704, 5705, 5706, 5707, 5708, 5709, 5710), the embodiments of the present disclosure are not limited thereto. The inorganic light-emitting element (50) may include nine or fewer grooves or eleven or more grooves. The number of grooves is not limited.

[0135] The groove (57) may include grooves of various shapes. For example, referring to FIGS. 5 and 6, the plurality of grooves (5701, 5702, 5703, 5704, 5705, 5706, 5707, 5708, 5709, 5710) may have a trapezoidal cross-section. For example, referring to FIGS. 7 and 8, the plurality of grooves (5701, 5702, 5703, 5704, 5705, 5706, 5707, 5708, 5709, 5710) may have a triangular cross-section. For example, referring to FIGS. 9 and 10, the plurality of grooves (5701, 5702, 5703, 5704, 5705, 5706, 5707, 5708, 5709, 5710) may have a curved shape. For example, referring to FIGS. 9 and 10, the plurality of grooves (5701, 5702, 5703, 5704, 5705, 5706, 5707, 5708, 5709, 5710) may have an arc shape. For example, referring to FIGS. 11 and 12, the plurality of grooves (5701, 5702, 5703, 5704, 5705, 5706, 5707, 5708, 5709, 5710) may have a rectangular cross-section. For example, in FIGS. 11 and 12, the plurality of grooves (5701, 5702, 5703, 5704, 5705, 5706, 5707, 5708, 5709, 5710) are illustrated as having a rectangular cross-section, but the plurality of grooves (5701, 5702, 5703, 5704, 5705, 5706, 5707, 5708, 5709, 5710) may also have a square cross-section.

[0136] In the drawing, a plurality of grooves (5701, 5702, 5703, 5704, 5705, 5706, 5707, 5708, 5709, 5710) are depicted as having a shape that becomes narrower as they get farther away from the light-emitting surface (55) (see FIGS. 5 to 10). However, the embodiments of the present disclosure are not limited thereto, and for example, the plurality of grooves (5701, 5702, 5703, 5704, 5705, 5706, 5707, 5708, 5709, 5710) may have a shape that becomes wider as they get farther away from the light-emitting surface (55).

[0137] In the drawing, the plurality of grooves (5701, 5702, 5703, 5704, 5705, 5706, 5707, 5708, 5709, 5710) are depicted as being spaced apart from each other by a predetermined distance (see FIGS. 5 to 12). However, the embodiments of the present disclosure are not limited thereto. For example, at least some of the plurality of grooves (5701, 5702, 5703, 5704, 5705, 5706, 5707, 5708, 5709, 5710) may be arranged to be in contact with each other. For example, the spacing between multiple homes (5701, 5702, 5703, 5704, 5705, 5706, 5707, 5708, 5709, 5710) may be different.

[0138] According to embodiments of the present disclosure, at least some of the plurality of grooves may be provided to have different shapes. For example, some of the plurality of grooves may have a rectangular cross-sectional shape, and others of the plurality of grooves may have a triangular cross-sectional shape. For example, each of the plurality of grooves may have a different shape. For example, the examples of the plurality of grooves illustrated in FIGS. 5 to 12 may be combined with each other. Furthermore, the groove portion (57) may include various combinations of grooves other than the examples described above.

[0139] The QD layer (58) may be provided in the groove (57). The QD layer (58) may be filled inside the groove (57) (see FIGS. 5 to 12). The QD layer (58) may be provided not only in the groove (57) but also on the light-emitting surface (55). The QD layer (58) may be provided to cover the groove (57) and the light-emitting surface (55) (see FIGS. 6, 8, 10, and 12). The QD layer (58) may have a predetermined thickness (t) from the light-emitting surface (55). For example, the QD layer (58) may include a first layer (581) provided in the groove (57) and a second layer (582) provided to cover the light-emitting surface (55) on the first layer (581). The second layer (582) may protrude from the light-emitting surface (55). The second layer (582) may have a predetermined thickness (t). For example, a QD layer (58) may be formed as QD ink is printed on the groove (57) and / or the light-emitting surface (55).

[0140] Figure 13 is an enlarged cross-sectional view showing an example of an inorganic light-emitting element.

[0141] Referring to Fig. 13, a relationship regarding the spacing between two adjacent grooves among the plurality of grooves can be derived. For convenience of explanation, grooves (5701) and (5702) will be described as examples. The description of grooves (5701) and (5702) can be applied to any two adjacent grooves among the plurality of grooves.

[0142] The inorganic light emitting element (50) may include a groove (57). The groove (57) may include a groove (5701) and a groove (5702) positioned adjacent to the groove (5701).

[0143] The light-emitting surface (55) of the inorganic light-emitting element (50) may be arranged to face a medium provided between the substrate (40) and the color filter (70) (e.g., space (85)).

[0144] For example, an optical clear resin (OCR) may be provided between the inorganic light-emitting element (50) and the color filter (70) (for example, the space (85)). For example, an optical clear resin (OCR) may be provided between the substrate (40) and the color filter (70) (for example, the space (85)). The optical clear resin (OCR) may increase the transmittance to improve visibility and image quality. In addition, the optical clear resin (OCR) may be provided to protect the substrate. For example, air may be provided between the inorganic light-emitting element (50) and the color filter (70). For example, air may be provided between the substrate (40) and the color filter (70) (for example, the space (85)). For example, a film having various optical functions may be provided between the inorganic light-emitting element (50) and the color filter (70) (for example, the space (85)). However, the embodiments of the present disclosure are not limited to the examples described above, and the medium may be provided in various types depending on the configuration and / or arrangement of the display module (30).

[0145] A relationship can be derived based on the light (L1) incident on the light-emitting surface (55) between the home (5701) and the home (5702) and reflected from the light-emitting surface (55).

[0146] In Fig. 13, a state in which grooves (5701) and grooves (5702) are spaced apart by a gap (g) sufficient to allow light (L1) to pass through grooves (5701) or (5702) is illustrated. Based on the state illustrated in Fig. 13, a relational expression for the gap between the first groove and the second groove can be derived. If the gap between the first groove and the second groove is equal to or smaller than the gap derived from the relational expression, it can be understood that light (L1) can unconditionally pass through at least one of the first groove and the second groove.

[0147] Light (L1) generated in the active layer (53) can be incident on the light-emitting surface (55) between the first groove and the second groove. At this time, the incident angle for total reflection of the light (L1) can be greater than arcsin(n1 / n2). Here, n1 is the refractive index of the medium, and n2 is the refractive index of the inorganic light-emitting element (50).

[0148] Based on Fig. 13, a triangle (T) can be assumed to be composed of sides formed by (i) an axis that serves as a reference for reflection of light (L1), (ii) light (L1) reflected from the light-emitting surface (55), and (iii) an imaginary line from the axis that serves as a reference for reflection of light (L1) to the second groove. The length of the side formed by (i) the axis that serves as a reference for reflection of light (L1) of the triangle (T) is d, and the distance from (iii) the axis that serves as a reference for reflection of light (L1) of the triangle (T) to the second groove is g / 2. In addition, the angle (θ) between the side formed by (i) the axis that serves as a reference for reflection of light (L1) of the triangle (T) and (ii) the side formed by light (L1) reflected from the light-emitting surface (55) can be assumed to be a critical angle arcsin(n1 / n2). Applying trigonometric functions, tan(θ) is g / 2d. That is, tan(arcsin(n1 / n2)) is g / 2d. Here, g is 2d*tan(arcsin(n1 / n2)).

[0149] Therefore, when the distance between the grooves (5701) and (5702) is equal to or less than 2d*tan(arcsin(n1 / n2)), light incident on the light-emitting surface (55) can pass through the grooves (5701) and / or the grooves (5702). Similarly, when the distance between the grooves (5701) and (5702) is equal to or less than 2d*tan(arcsin(n1 / n2)), light incident on the light-emitting surface (55) can pass through the QD layer (58) inside the grooves (5701) and / or the QD layer (58) inside the grooves (5702). For example, even if light (see L2) generated in the active layer (53) is incident on the light-emitting surface (55) without passing through the grooves (5701) and (5702), the light (see light L2) may be reflected at the light-emitting surface (55) and pass through the grooves (5701) and / or (5702). The light (see L2) may be color-converted while passing through the QD layer (58) inside the grooves (5701) and / or the QD layer (58) inside the grooves (5702).

[0150] Light generated in the active layer (53) and reflected from the light-emitting surface (55) can be arranged to pass through at least one of the groove (5701) and the groove (5702). In other words, light generated in the active layer (53) and reflected from the light-emitting surface (55) can pass through at least one of the QD layer (58) inside the groove (5701) and the QD layer (58) inside the groove (5702). Accordingly, the rate at which light generated in the active layer (53) passes through the QD layer (58) can be increased, and the color conversion efficiency of the inorganic light-emitting element (50) can be improved.

[0151] In summary, home (5701) and home (5702) can satisfy the following relationship. In addition, as described above, two adjacent homes among the plurality of homes can satisfy the following relationship.

[0152] g ≤ 2d*tan(arcsin(n1 / n2)) (relation)

[0153] Here, g is the distance between the grooves (5701) and (5702), D is the depth of the grooves (5701) and (5702), n1 is the refractive index of the medium toward which the light-emitting surface (55) faces, and n2 is the refractive index of the inorganic light-emitting element (50).

[0154] For example, a case where the medium is an optically transparent resin (OCR) will be described. The refractive index (n1) of the optically transparent resin (OCR) may be approximately 1.5 to 1.6. When the inorganic light-emitting element (50) includes GaN, the refractive index (n2) of the inorganic light-emitting element (50) may be approximately 2.4 to 2.7. When the refractive index (n1) of the optically transparent resin (OCR) is 1.6 and the refractive index (n2) of the inorganic light-emitting element (50) is 2.4, the maximum value of 2*tan(arcsin(n1 / n2)) can be calculated from the relationship. The value of 2*tan(arcsin(1.6 / 2.4)) may be approximately 1.78885. Therefore, the gap between the grooves (5701) and the grooves (5702) may be less than approximately 1.79 of the depth (d). The spacing between two adjacent grooves among the plurality of grooves may be less than approximately 1.79 of the depth (d).

[0155] For example, a case where the medium is air will be described. The refractive index (n1) of air may be approximately 1. When the inorganic light-emitting element (50) includes GaN, the refractive index (n2) of the inorganic light-emitting element (50) may be approximately 2.4 to 2.7. When the refractive index (n1) of air is 1 and the refractive index (n2) of the inorganic light-emitting element (50) is 2.4, the maximum value of 2*tan(arcsin(n1 / n2)) can be calculated from the relationship. The value of 2*tan(arcsin(1 / 2.4)) may be approximately 0.916698. Therefore, the interval between the grooves (5701) and the grooves (5702) may be less than approximately 0.92 of the depth (d). The interval between two adjacent grooves among the plurality of grooves may be less than approximately 0.92 of the depth (d).

[0156] Although FIG. 13 illustrates an example in which the grooves (5701) and (5702) have a rectangular cross-section and the inorganic light-emitting element (50) is not provided with a dichroic filter (59), the embodiments of the present disclosure are not limited thereto. It goes without saying that the relationship derived as described above can be applied to various embodiments. The relationship derived as described above can also be applied to examples of the inorganic light-emitting element (50) illustrated in FIGS. 5 to 12.

[0157] According to one embodiment, a display module (30) may include a substrate (40); an inorganic light-emitting element (50) mounted on the substrate; and a color filter (70) corresponding to the inorganic light-emitting element. The inorganic light-emitting element (50) may include an active layer (53) that generates light having a first color, a light-emitting surface (55) spaced apart from the active layer, a groove portion (57) having grooves continuously formed on the light-emitting surface (55), and a QD (Quantum Dot) layer (58) provided in the groove portion and configured to convert light having the first color generated from the active layer into a second color. The color filter (70) may be configured to absorb light having the first color emitted from the inorganic light-emitting element.

[0158] The above color filter (70) can be placed so as to face the light-emitting surface (55) of the inorganic light-emitting element (50).

[0159] The above-described inorganic light-emitting element (50) may include a dichroic filter (59) provided to reflect light having a first color emitted through at least one of the light-emitting surface (55) and the QD layer (58).

[0160] The above dichroic filter (59) can be provided to cover the light-emitting surface (55) and the QD layer (58).

[0161] The above QD layer (58) can be provided to cover the groove (57) and the light-emitting surface (55).

[0162] The above-mentioned home portion (57) may include a first home and a second home positioned adjacent to the first home.

[0163] Light generated from the active layer (53) and reflected from the light-emitting surface (55) may be arranged to pass through at least one of the first groove and the second groove.

[0164] An optically transparent resin (Optical Clear Resin, OCR) may be provided between the inorganic light-emitting element and the color filter. The first groove and the second groove may satisfy the following relationship: g ≤ 2d*tan(arcsin(n1 / n2)) (g: gap between the first groove and the second groove, d: depth of the first groove and the second groove, n1: refractive index of the optically transparent resin, n2: refractive index of the inorganic light-emitting element).

[0165] The gap (g) between the first groove and the second groove may be set to be smaller than 1.79 times the depth (d).

[0166] Air may be provided between the inorganic light-emitting element and the color filter. The first groove and the second groove may satisfy the following relationship: g ≤ 2d*tan(arcsin(n1 / n2)) (g: gap between the first groove and the second groove, d: depth of the first groove and the second groove, n1: refractive index of air, n2: refractive index of the inorganic light-emitting element)

[0167] The gap (g) between the first groove and the second groove may be set to be smaller than 0.92 times the depth (d).

[0168] The above-mentioned inorganic light-emitting element may be a first inorganic light-emitting element (e.g., a red light-emitting element (50a)) configured to convert blue light into red light, and the color filter may be a first color filter (e.g., a red filter (71)) configured to absorb blue light emitted from the first inorganic light-emitting element. The display module (30) may include a second inorganic light-emitting element (e.g., a green light-emitting element (50b)) spaced apart from the first inorganic light-emitting element and configured to convert blue light into green light. The display module (30) may include a second color filter (e.g., a green filter (72)) corresponding to the second inorganic light-emitting element and configured to absorb blue light emitted from the second inorganic light-emitting element. The display module (30) may include a third inorganic light-emitting element (e.g., a blue light-emitting element (50c)) spaced apart from the second inorganic light-emitting element and configured to emit blue light. The display module (30) may include a third color filter (e.g., a blue filter (73)) corresponding to the third inorganic light-emitting element and provided to transmit blue light emitted from the third inorganic light-emitting element.

[0169] The display module (30) may include a black matrix (80) provided between the first color filter (e.g., red filter (71)) and the second color filter (e.g., green filter (72)), and between the second color filter (72) (e.g., green filter (72)) and the third color filter (73) (e.g., blue filter (73)).

[0170] The above-described inorganic light-emitting element (50) includes a contact electrode (e.g., a first contact electrode (54a) and a second contact electrode (54b)) formed on the opposite side (e.g., a bottom surface (56)) of the above-described inorganic light-emitting element (50) from the light-emitting surface (55), and the substrate (40) may include a pad electrode (e.g., a first pad electrode (45a) and a second pad electrode (45b)) corresponding to the contact electrode.

[0171] The above substrate (40) may include the substrate body (42); and a TFT (Thin Film Transistor) layer (44) formed on the substrate body (42) and arranged to drive the inorganic light-emitting element (50).

[0172] According to one embodiment, an inorganic light-emitting element (50) may include a first semiconductor (51) configured to form a light-emitting surface (55); a second semiconductor (52) spaced apart from the first semiconductor; an active layer (53) disposed between the first semiconductor and the second semiconductor and configured to generate light; a groove portion (57) having a plurality of grooves sunken in the light-emitting surface; and a QD (Quantum Dot) layer (58) configured to convert a color of light generated from the active layer from a first color to a second color, the QD layer being provided inside the groove portion.

[0173] The above-mentioned inorganic light-emitting element (50) may include a dichroic filter (59) provided to cover the QD layer (58).

[0174] The above dichroic filter (59) may be arranged to reflect light having a first color emitted through at least one of the light-emitting surface (55) and the QD layer (58).

[0175] The above QD layer (58) is provided to cover the groove (57) and the light-emitting surface (55), and may have a predetermined thickness (t) from the light-emitting surface (55).

[0176] The above plurality of grooves are arranged spaced apart from each other, and two adjacent grooves among the plurality of grooves can satisfy the following relationship: g ≤ 2d*tan(arcsin(n1 / n2)) (g: gap between two adjacent grooves, d: depth of groove, n1: refractive index of medium facing the light-emitting surface, n2: refractive index of inorganic light-emitting element)

[0177] According to one embodiment, an inorganic light-emitting device (50) may include a first semiconductor including a light-emitting surface, a second semiconductor spaced apart from the first semiconductor, an active layer configured to generate light and located between the first semiconductor and the second semiconductor, a groove portion having a plurality of grooves sunken in the light-emitting surface, and a QD layer located within the groove portion. The QD layer may be configured to convert a color of light generated by the active layer from a first color to a second color.

[0178] The above-described inorganic light-emitting element (50) may include a dichroic filter configured to reflect light having a first color emitted through at least one of the light-emitting surface and the QD layer.

[0179] The above dichroic filter may be on the light-emitting surface and the QD layer.

[0180] The above dichroic filter may be on the groove and the light-emitting surface.

[0181] The above grooves may include a first groove and a second groove adjacent to the first groove.

[0182] According to embodiments of the present disclosure, the light efficiency of an inorganic light-emitting element and a display module including the same can be improved.

[0183] According to embodiments of the present disclosure, the color conversion efficiency of an inorganic light-emitting element and a display module including the same can be improved.

[0184] According to embodiments of the present disclosure, light loss of an inorganic light-emitting element and a display module including the same can be reduced.

[0185] The effects that can be obtained from the embodiments of the present disclosure are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the present disclosure.

[0186] The foregoing has illustrated and described specific, non-limiting, exemplary embodiments of the present disclosure. However, those skilled in the art will appreciate that the embodiments of the present disclosure are not limited to the aforementioned embodiments, and that various changes and modifications are possible without departing from the spirit and scope of the present disclosure.

Claims

1. Substrate; As an inorganic light-emitting element on the above substrate, An active layer configured to generate light having a first color, A light-emitting surface spaced apart from the above active layer, A groove portion having grooves that are sunken into the above-mentioned light-emitting surface, An inorganic light-emitting element including a QD (Quantum Dot) layer located in the above-mentioned home portion and configured to convert light having the first color generated from the above-mentioned active layer into a second color; and A display module including a color filter corresponding to the inorganic light-emitting element and configured to absorb light having a first color emitted from the inorganic light-emitting element.

2. In paragraph 1, The above color filter, A display module facing the light-emitting surface of the above-mentioned inorganic light-emitting element.

3. In paragraph 1, The above-mentioned inorganic light-emitting element is, A display module further comprising a dichroic filter configured to reflect light having a first color emitted through at least one of the light-emitting surface and the QD layer.

4. In paragraph 3, The above dichroic filter is, A display module on the above light-emitting surface and the QD layer.

5. In paragraph 1, The above QD layer, A display module on the above home portion and the above light-emitting surface.

6. In paragraph 1, The above homes include a display module including a first home and a second home adjacent to the first home.

7. In paragraph 6, A display module in which light generated in the active layer and reflected from the light-emitting surface passes through at least one of the first groove and the second groove.

8. In paragraph 6, Further comprising an optical clear resin (OCR) between the above-mentioned inorganic light emitting element and the color filter, A display module in which the first home and the second home satisfy the following relationship. g ≤ 2d*tan(arcsin(n1 / n2)) g is the gap between the first and second grooves, d is the depth of the first and second grooves, n1 is the refractive index of OCR, n2 is the refractive index of the inorganic light-emitting element.

9. In paragraph 8, A display module wherein the gap between the first groove and the second groove is smaller than 1.79 times the depth.

10. In paragraph 6, Further comprising air between the above-mentioned inorganic light emitting element and the above-mentioned color filter, A display module in which the first home and the second home satisfy the following relationship. g ≤ 2d*tan(arcsin(n1 / n2)) g is the gap between the first and second grooves, d is the depth of the first and second grooves, n1 is the refractive index of air, n2 is the refractive index of the inorganic light-emitting element.

11. In paragraph 10, A display module wherein the gap between the first groove and the second groove is smaller than 0.92 times the depth.

12. In paragraph 1, The above inorganic light-emitting element is a first inorganic light-emitting element configured to convert blue light into red light, The above color filter is a first color filter configured to absorb blue light emitted from the first inorganic light-emitting element, A second inorganic light-emitting element spaced apart from the first inorganic light-emitting element and configured to convert blue light into green light; A second color filter corresponding to the second inorganic light-emitting element and configured to absorb blue light emitted from the second inorganic light-emitting element; a third inorganic light-emitting element spaced apart from the second inorganic light-emitting element and configured to emit blue light; and A display module including a third color filter corresponding to the third inorganic light-emitting element and configured to transmit blue light emitted from the third inorganic light-emitting element.

13. In paragraph 12, A display module including a black matrix between the first color filter and the second color filter, and between the second color filter and the third color filter.

14. In paragraph 1, The above inorganic light-emitting element further includes a contact electrode formed on the opposite side of the inorganic light-emitting element from the light-emitting surface, A display module wherein the substrate includes pad electrodes corresponding to the contact electrodes.

15. In paragraph 1, The above substrate is, the above substrate body; and A display module including a TFT (Thin Film Transistor) layer located on the substrate body and configured to drive the inorganic light-emitting element.

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