Display device

Abstract

The present invention relates to a display device structure for simultaneously improving luminance and contrast ratio. The display device according to an embodiment of the present invention may comprise: a substrate; a light-emitting element layer including a plurality of cells formed on the substrate; a cover glass provided on the light-emitting element layer; and a micro Fresnel lens array layer formed between the light-emitting element layer and the cover glass.

Description

display device

[0001] This specification relates to improving the image quality of a display device.

[0002]

[0003] Brightness and contrast ratio are very important factors in display devices, and accordingly, liquid crystal displays (LCDs) are structurally equipped with diffusers and the like to increase brightness. However, if a lens structure is provided to improve brightness, light scattering occurs around the outer edge of the cell, which weakens the black light and lowers the contrast ratio. Conversely, if a structure is provided to strengthen the black light by providing a black matrix (BM) pattern, there is a problem of brightness decreasing.

[0004] To overcome this trade-off, a structure equipped with a micro lens array (MLA) on the top of the display device has recently been proposed; however, this also suffers from scattering caused by the use of divergent lenses, resulting in issues such as reduced black light and lower contrast ratio.

[0005] In the field of transparent display devices, conventional methods have adopted vertical or horizontal split cell structures where one side is a cell and the other is a transparent space; however, this has the disadvantage that transparency is reduced due to light scattering, resulting in lower actual transparency relative to the mechanically transparent area. Therefore, a cell structure is required that can enhance the linearity of light to achieve high brightness while also increasing the transparency of the display device.

[0006] In automotive display devices, the importance of a privacy mode that can restrict the driver's visibility while ensuring visibility of the display device for the driver and passengers is emphasized, and for this purpose, a cell structure capable of outputting light with strong directional properties is required.

[0007]

[0008] The embodiments relate to a display device that forms a highly directional light that simultaneously increases the brightness and contrast ratio perceived by the user by including a micro Fresnel lens array layer between a cell and a cover glass.

[0009] The embodiments relate to a display device capable of simultaneously increasing brightness and contrast ratio by forming a black matrix in a specific pattern on the outer edge of a light-emitting element cell and forming light with strong directional properties using a micro-Fresnel lens array.

[0010] The embodiments relate to a display device that increases the transparency of a display device along with an increase in brightness due to the characteristics of light with strong directional properties when applied to a transparent display device by forming the cell structure as an island structure in which each sub-cell is separated from each other.

[0011] The embodiments relate to a display device that can be utilized in a protection mode of a vehicle display device requiring a narrow viewing angle by increasing the linearity of light and the transparency of the display device.

[0012]

[0013] According to one embodiment, the display device may include a substrate, a light-emitting element layer comprising a plurality of cells formed on the substrate, a cover glass provided on the light-emitting element layer, and a micro Fresnel lens array layer formed between the light-emitting element and the cover glass.

[0014] According to one embodiment, the micro Fresnel lens array layer comprises a plurality of micro Fresnel lenses, and the micro Fresnel lenses have a plurality of concentric grooves, and each of the plurality of concentric grooves is formed to have an inclination from the center of the lens to the outer edge of the lens, and the degree of inclination of the inclination of each of the concentric grooves may be different from each other.

[0015] According to one embodiment, the angle formed between the inclination of each concentric groove and the lens center plane may increase as one moves from the concentric groove formed at the center of the lens to the concentric groove formed at the outer edge of the lens.

[0016] According to one embodiment, the concentric groove formed in the center of the lens is formed parallel to the center plane of the lens, and the diameter of the concentric groove formed in the center of the lens may be 1 / 3 or less of the diameter of the micro-Fresnel lens.

[0017] According to one embodiment, the length of the inclined surface of each of the plurality of concentric grooves may be characterized as increasing from the concentric groove formed at the center of the lens to the concentric groove formed at the outer edge of the lens.

[0018] According to one embodiment, each of the plurality of micro-Fresnel lenses may be located on the upper part of each of the cells.

[0019] According to one embodiment, the cell includes a plurality of sub-cells, and each of the plurality of micro-Fresnel lenses may be located on the upper part of each of the sub-cells.

[0020] According to one embodiment, the cell may be configured such that a red light sub-cell, a green light sub-cell, and a blue light sub-cell are arranged in a row adjacent to each other, and the light-emitting element layer may be characterized by having a structure in which the cells are repeatedly arranged.

[0021] According to one example, the cell may be square-shaped and configured so that a red light subcell, two green light subcells, and a blue light subcell are arranged in a 2x2 matrix form.

[0022] According to one embodiment, the cell may be configured such that a red light subcell, a green light subcell, a blue light subcell, and a white light subcell are arranged in a row adjacent to each other.

[0023] According to one embodiment, the cell may be configured such that a red light subcell, a green light subcell, and a blue light subcell are arranged in a row adjacent to each other, and the area occupied by the red light subcell, the green light subcell, and the blue light subcell may be 50% to 60% of the cell area.

[0024] According to one embodiment, two of the red light subcell, green light subcell, and blue light subcell are provided at both corners of one side of the cell, and the remaining one subcell is provided at the center of the side opposite to the said side, and the structure may be characterized in such a way that the subcells do not come into contact when the plurality of cells come into contact.

[0025] According to one embodiment, the length of one side of the sub-cell may be 1 / 3 of the length of one side of the cell.

[0026] According to one embodiment, the center distance between the sub-cells within each of the cells may be 4 / √3 times the length of one side of the sub-cell, and the center distance between the closest sub-cells in a vertical or horizontal direction between the sub-cells may be 2 times the length of one side of the sub-cell.

[0027] According to one embodiment, the display device further includes a black matrix layer including a black matrix (BM) pattern, wherein the black matrix patterns are provided on the first and third sides of the cell, or on the second and fourth sides, or are provided to surround the cell, and the black matrix layer may be provided between the light-emitting element layer and the micro-Fresnel lens array layer, or between the micro-Fresnel lens array layer and the cover glass.

[0028] According to one embodiment, the display device further includes a black matrix (BM) layer, and the black matrix layer may be configured to cover the entire micro-Fresnel lens array layer.

[0029]

[0030] According to one embodiment of the present invention, by adding at least one micro-Fresnel lens array layer to the light-emitting element layer and the cover glass eye, it is possible to simultaneously increase brightness and contrast ratio while maintaining the effects of increasing brightness and reducing power consumption of the micro-lens array that conventionally used diverging lenses.

[0031] According to one embodiment of the present invention, by arranging a black matrix pattern in a specific shape between a light-emitting element and a micro-Fresnel lens array layer or between a micro-Fresnel lens and a cover glass, reflected light from the side direction is also concentrated in the central part, thereby further increasing the light intensity in the central part and preventing black light degradation compared to a structure using only a conventional convex lens or a micro-Fresnel lens, making it possible to simultaneously increase contrast ratio and brightness.

[0032] According to one embodiment of the present invention, by arranging sub-cells inside a cell in an island structure, the distinction between cells becomes clear, thereby providing clear light to the user, and the distinction between the transparent area and the light-emitting area becomes distinct, so that when applied to a transparent display device, the three-dimensional effect and transparency effect perceived by the user can be further enhanced.

[0033] According to one embodiment of the present invention, by forming light with strong directional properties through the application of a micro-Fresnel lens array layer and a black matrix pattern, when applied to a vehicle display device, the effect of increasing the visibility of the driver and passenger while restricting the field of vision of surrounding drivers when using the driver protection mode can be obtained.

[0034]

[0035] FIG. 1 is a diagram showing the cell structure of a light-emitting element layer according to one embodiment.

[0036] FIG. 2 is a cross-sectional view showing the structure of a display device according to one embodiment.

[0037] FIG. 3 is a cross-sectional view showing the structure of a micro-Fresnel lens according to one embodiment.

[0038] FIGS. 4 and 5 are drawings showing the cell structure of a light-emitting element layer according to different embodiments.

[0039] FIG. 6 is a diagram showing the cell structure of a conventional light-emitting element layer compared with an embodiment of the present invention.

[0040] FIGS. 7 and 8 are drawings showing a structure for arranging a micro Fresnel lens on a light-emitting element layer according to different embodiments.

[0041] FIG. 9 is a drawing showing the size of a micro-Fresnel lens provided on a cell or sub-cell according to one embodiment.

[0042] FIGS. 10a and 10b are drawings showing black matrix patterns provided on a light-emitting element layer according to different embodiments.

[0043] Figure 11 is a diagram showing the light path when a black matrix pattern and a micro-Fresnel lens are placed on a light-emitting element layer.

[0044] FIGS. 12a to 12d are cross-sectional views showing the structure of a display device according to different embodiments.

[0045]

[0046] The advantages and features of this post, and the methods for achieving them, will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, this post is not limited to the embodiments described below but may be implemented in various different forms; these embodiments are provided merely to ensure that this post is complete and to fully inform those skilled in the art of the scope of this post, and this post is defined only by the scope of the claims. Throughout the specification, the same reference numerals refer to the same components.

[0047] When one component is referred to as being "connected to" or "coupled to" another component, it includes cases where it is directly connected or coupled to the other component, or cases where another component is interposed. Conversely, when one component is referred to as being "directly connected to" or "directly coupled to" another component, it indicates that no other component is interposed. "And / or" includes each of the mentioned items and all combinations of one or more of them.

[0048] The terms used herein are for describing the embodiments and are not intended to limit this post. In this specification, the singular form includes the plural form unless specifically stated otherwise in the text. As used herein, "comprises" and / or "comprising" do not exclude the presence or addition of one or more other components, steps, actions, and / or elements to the mentioned components, steps, actions, and / or elements.

[0049] Although terms such as "first," "second," etc., are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used merely to distinguish one component from another.

[0050] Therefore, it is obvious that the first component mentioned below may be the second component within the technical scope of this post. Unless otherwise defined, all terms used in this specification (including technical and scientific terms) may be used in a meaning commonly understood by those skilled in the art to which this post pertains. Furthermore, terms defined in commonly used dictionaries are not to be interpreted ideally or excessively unless explicitly and specifically defined otherwise. Additionally, in the drawings, the thicknesses, proportions, and dimensions of the components are exaggerated for the effective description of the technical content. "And / or" includes all one or more combinations that the associated components may define.

[0051] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein.

[0052] FIG. 1 is a diagram showing the cell structure of a light-emitting element layer of a display device according to one embodiment.

[0053] Referring to FIG. 1, the light-emitting element layer (29) is formed on a substrate (10) and may include a structure in which cells (20), including red light subcells (21), green light subcells (22), and blue light subcells (23), are repeatedly arranged. Additionally, the cells (20) may have four sides on the xy plane, which may be referred to as the first side (25), the second side (26), the third side (27), and the fourth side (28), respectively.

[0054] Referring to FIG. 1, the distance between the centers of the two closest cells (20) on the light-emitting element layer (29) can be defined as the cell pitch (120), and the distance between the centers of the two closest subcells among the red light subcell (21), green light subcell (22) and blue light subcell (23) can be defined as the subcell pitch (130).

[0055] Referring to FIG. 1, the red light subcell (21), green light subcell (22), and blue light subcell (23) within the cell (20) may be an OLED (organic light emitting diode) or a Micro LED.

[0056] FIG. 2 is a cross-sectional view showing the structure of a display device according to one embodiment.

[0057] Referring to FIG. 2, cells (20) including red light subcells (21), green light subcells (22), and blue light subcells (23) can be repeatedly arranged on a substrate (10) to form a light-emitting element layer (29).

[0058] At least one black matrix (BM) layer (100) may be formed on the light-emitting element layer (29). The black matrix layer (100) refers to a layer on which a black matrix pattern is formed. The structure for forming the black matrix pattern is described in more detail in FIGS. 10a and 10b.

[0059] Referring to FIG. 2, at least one micro Fresnel lens array layer (110) can be formed on the light-emitting element layer (29).

[0060] Referring to FIG. 2, a cover glass (150) may be provided on a micro-Fresnel lens array layer (110).

[0061] Referring to FIG. 2, an adhesive layer (102) may be formed between the micro-Fresnel lens array layer (110) and the cover glass (150), and between the micro-Fresnel lens array layer (110) and the light-emitting element layer (29). The adhesive layer (102) may be formed through an optically clear resin (OCR) process or an optically clear adhesive (OCA) process. In the process, an acrylic-based, silicone-based, or urethane-based adhesive material may be used, and the adhesive layer (102) may serve to fix the micro-Fresnel lens array layer (110) within the display device.

[0062] The micro Fresnel lens array layer (110) can be formed between the light-emitting element layer (29) and the cover glass (150) through exposure, deposition, and etching processes on a sheet or film of resin, dielectric, or louver structure, and may include a plurality of micro Fresnel lenses (111) formed through the said process.

[0063] In the example of FIG. 2, the micro-Fresnel lens (111) is shown as being provided on each cell (20), but according to another embodiment, the micro-Fresnel lens (111) may be provided on each sub-cell (21, 22 or 23).

[0064] FIG. 3 is a cross-sectional view showing the structure of a micro Fresnel lens (111) according to one embodiment.

[0065] Referring to FIG. 3, the micro Fresnel lens (111) may have a structure having continuous concentric grooves rather than a concave or convex lens shape. It may include a dielectric, resin, and synthetic resin, and may be manufactured by applying a photolithography and etching process or by using a mold.

[0066] Referring to FIG. 3, a plane contained in the xy plane and located at the center of the z-axis direction of the micro-Fresnel lens (111) can be referred to as the center plane (112) of the Fresnel lens. And the diameter in the x or y-axis direction of the center plane of the single micro-Fresnel lens (111) can be referred to as the diameter (121) of the micro-Fresnel lens.

[0067] Referring to FIG. 3, the surface area (113) of the micro-Fresnel lens (111) may have a plurality of concentric grooves. Here, each concentric groove may be formed to have a constant slope as it extends from a part close to the center of the lens to a part farther away. According to one embodiment, each concentric groove may have the highest part closest to the center of the lens and the lowest part farther from the center of the lens. Additionally, the slope of each concentric groove may increase as it extends outward from the concentric groove at the center of the lens. Furthermore, the depth or height of each concentric groove may increase as it extends outward from the concentric groove at the center of the lens. Alternatively, the length of the sloped surface of each concentric groove may increase as it extends outward from the concentric groove at the center of the lens.

[0068] Referring to FIG. 3, the diameter of the groove located at the very center of the lens in the xy plane, which is parallel to the center plane (112) of the lens within the surface area (113) of the lens, can be referred to as the central diameter (122) of the micro-Fresnel lens. Here, the central diameter (122) may be equal to or smaller than 1 / 3 of the cell pitch (122). If the length of the center of the lens is greater than 1 / 3 of the cell pitch, scattering of light at the outer edge of the lens in the center increases, and the straightness may be compromised.

[0069] According to one embodiment, the groove in the center of the Fresnel lens may be parallel to the center plane (112) of the Fresnel lens. That is, the circular groove in the center of the Fresnel lens may be a circular groove on a flat plane without inclination, and the inclination may be 0 degrees. The second concentric groove may be formed to have a greater inclination than the circular groove in the center, and the third concentric groove may be formed to have a greater inclination than the second concentric groove. And the inclination of the concentric groove formed at the outermost edge may be the greatest. Here, the inclination of each concentric groove may refer to the angle formed between the inclination formed from a part close to the center of the lens to a part far from the center of the lens and the center plane (112) of the lens.

[0070] A Fresnel lens (111) can refract light of random directions into parallel light to obtain light with high linearity, which can enable a simultaneous increase in brightness and contrast ratio.

[0071] FIGS. 4 to 7 are drawings showing the cell structure of a light-emitting element layer according to various embodiments of the present invention.

[0072] Referring to FIGS. 4 to 7, a micro-Fresnel lens (111) may be provided on each cell (20) regardless of the shape of each cell (20) provided in the light-emitting element layer (29). Alternatively, the micro-Fresnel lens (111) may be provided on the sub-cells (21, 22, 23) of each cell (20) provided in the light-emitting element layer (20).

[0073] Referring to FIG. 4, the light-emitting element layer (29) is formed on a substrate (10) and may include a structure in which cells (20) including a red light subcell (21), two green light subcells (22) and a blue light subcell (23) are repeatedly arranged.

[0074] Referring to FIG. 5, the light-emitting element layer (29) is formed on the substrate (10) and may include a structure in which cells (20) including red light subcells (21), green light subcells (22), blue light subcells (23) and white light subcells (24) are repeatedly arranged.

[0075] FIG. 6 may illustrate a cell arrangement structure of a conventional transparent display. Referring to FIG. 6, each cell (20) of the light-emitting element layer (29) may include a red light sub-cell (21), a green light sub-cell (22), and a blue light sub-cell (23) arranged in a row adjacent to each other, and may be arranged so that the area (30) occupied by the three sub-cells is 50-60% of the total area of ​​the cell (20). In this case, due to the emission of light output from the cell (20), the actual transparency is about 30-40%, which is less than the transmittance of 40-50% of the total area of ​​the cell (20) through which light can pass, so high transparency cannot be obtained. Meanwhile, if the area of ​​the red, green, and blue sub-cells (21, 22, 23) is reduced in order to obtain high transparency, the brightness may decrease.

[0076] FIG. 7 may be a cell arrangement structure for a transparent display proposed in the present invention.

[0077] Referring to FIG. 7, a light-emitting element layer (29) may be formed on a substrate (10), and the light-emitting element layer (29) may have a structure in which island cells (20-1) are repeatedly arranged, in which red light subcells (21), green light subcells (22), and blue light subcells (23) are spaced apart from each other within a square shape. The island cell (20-1) may be characterized by a structure in which two of the red light, green light, and blue light subcells (21, 22, 23) are provided at both corners of one side of the shape of the cell (20-1), and the remaining one subcell is provided at the center of the side opposite to that side (the side facing that side), so that the subcells do not come into contact with each other. At this time, the length of one side of the island cell (20-1) may be defined as the pitch (120-1) of the island cell. In addition, the length of one side of each sub-cell of the square structure can be defined as the pitch (130-1) of the sub-cell of the island cell.

[0078] Referring to FIG. 7, the pitch (120-1) of the island cell may be three times the pitch (130-1) of the sub-cell. Additionally, the center distance (131) between the red light sub-cell (21), green light sub-cell (22), and blue light sub-cell (23) within a single island cell (20-1) may be 4 / √3 times the pitch (130-1) of the island cell. The distance (132) to the nearest sub-cell in the x-axis or y-axis direction among the red light sub-cell (21), green light sub-cell (22), and blue light sub-cell (23) of adjacent island cells (20-1) may be twice the pitch (130-1) of the island cell. This structure can increase the transparent area ratio of the island cell (20-1) to 70%. In addition, by using a micro-Fresnel lens, parallel light characteristics are maintained, thereby reducing the decrease in brightness caused by light scattering, and a brightness level of 50% of that of a standard display device can be achieved. This can be considered a higher brightness level compared to the conventional method, given that conventional transparent displays have a brightness level of 40% of that of a standard display device. Therefore, the transparent display structure proposed in this invention can achieve higher transparency and brightness compared to the conventional structure. This has the effect of enhancing user visibility when implementing a 3D screen on the transparent display.

[0079] Referring to FIG. 7, a micro-Fresnel lens (111) may be positioned on each of the red light sub-cell (21), green light sub-cell (22), and blue light sub-cell (23) of the island cell (20-1). When applied to a transparent display device, the micro-Fresnel lens (111) can clearly distinguish the intensity of light by color while minimizing scattering in the red, green, and blue sub-cells (21, 22, 23), thereby enhancing user visibility when implementing a 3D screen. FIG. 8 is a diagram showing a structure for placing a micro-Fresnel lens on a light-emitting element layer according to another embodiment.

[0080] Referring to FIG. 8, one micro-Fresnel lens (111) can be placed per island cell (20-1). Light from red, green, and blue sub-cells (21, 22, 23) can be directed straight toward a single micro-Fresnel lens (111), which can achieve the effect of increasing the light intensity of the entire screen. However, the intensity cannot be higher than if a micro-Fresnel lens (111) were provided in each sub-cell.

[0081] FIG. 9 is a drawing showing the size of a micro-Fresnel lens provided on a cell or sub-cell according to one embodiment.

[0082] Referring to FIG. 9, a micro-Fresnel lens (111) may be placed on a square cell (20-2). A pair of black matrix patterns (101) may be formed in the y-axis and / or x-axis directions outside the cell (20). According to one embodiment, a black matrix pattern (not shown) may also be formed in the area between each of the red light sub-cell (21), the green light sub-cell (22), and the blue light sub-cell (23). The length of one side (120-2) of the square cell may be equal to the cell pitch (120) of the square cell (20-2).

[0083] Referring to FIG. 9, the diameter (121) of the micro-Fresnel lens (111) may be equal to or smaller than the cell pitch (120). If the diameter (121) of the micro-Fresnel lens is larger than the cell pitch (120), user visibility may be reduced due to a decrease in contrast ratio.

[0084] Referring to FIG. 9, the central diameter (122) of the micro-Fresnel lens may be equal to or smaller than the sub-cell pitch (130). If the central diameter (122) of the micro-Fresnel lens is larger than the sub-cell pitch (130), scattering of outer light increases, which reduces brightness and may reduce user visibility.

[0085] FIG. 10a is a drawing illustrating a black matrix pattern according to one embodiment.

[0086] Referring to FIG. 10a, the black matrix pattern (101) may be formed between the light-emitting element layer (29) and the micro-Fresnel lens array layer (110) or between the micro-Fresnel lens array layer (110) and the cover glass (150). Additionally, the black matrix pattern (101) may be placed only on the first side (25) and the third side (27) of the cell (20). A structure having such a black matrix pattern (101) may be defined as a vertical black matrix pattern structure (160).

[0087] FIG. 10b is a drawing illustrating a black matrix pattern according to another embodiment.

[0088] Referring to FIG. 10b, the black matrix pattern (101) may be formed between the light-emitting element layer (29) and the micro-Fresnel lens array layer (110) or between the micro-Fresnel lens array layer (110) and the cover glass (150). Additionally, the black matrix pattern (101) may be placed only on the second side (26) and the fourth side (28) of the cell (20). A structure having such a black matrix pattern (101) may be defined as a horizontal black matrix pattern structure (170).

[0089] According to another embodiment, the black matrix pattern (101) may be placed on all of the first side (25) to the fourth side (28). That is, the black matrix may be placed to surround the cell.

[0090] In addition, according to another embodiment, the black matrix pattern (101) may also be formed to cover the entire light-emitting element layer (29), although this is not shown in the drawing.

[0091] Figure 11 is a diagram showing the light path when a black matrix pattern and a micro-Fresnel lens are placed on a light-emitting element layer.

[0092] Referring to FIG. 11, a black matrix pattern (101) is formed on the first side (25) and the third side (27) of the cell (20), and the black matrix layer (100) is positioned between the light-emitting element layer (29) and the micro-Fresnel lens array layer (110). In cases where light emitted from the light-emitting element layer (29) travels in a straight line in the z-axis direction (140), where it does not travel in a straight line in the z-axis direction and is not reflected by the black matrix pattern (101) (141), and where it is reflected by the black matrix layer (142), the light is guided to travel in a straight line in the z-axis direction by the micro-Fresnel lens (111), thereby enabling the display device to emit light with strong straightness. Although not shown in the drawing, the black matrix pattern (101) may also be formed on the second side (26) and the fourth side (28) of the cell (20), and in this case, light with strong straightness can be emitted in the same manner. Additionally, the black matrix pattern (101) may also be formed on the first side (25) to the fourth side (28) of the cell (20), in which case the straightness of the light may be strengthened. When applied to a transparent display device, this can provide high visibility to the user in implementing three-dimensional and 3D effects.

[0093] FIGS. 12a to 12d are cross-sectional views showing the structure of a black matrix layer and the structure of a display device that varies by the black matrix pattern according to different embodiments.

[0094] Referring to FIG. 12a, a black matrix layer (100) having a vertical black matrix pattern structure (160) may be positioned between a light-emitting element layer (29) and a micro-Fresnel lens array layer (110).

[0095] Referring to FIG. 12b, a black matrix layer (100) having a horizontal black matrix pattern structure (170) may be positioned between the light-emitting element layer (29) and the micro-Fresnel lens array layer (110).

[0096] Referring to FIG. 12c, a black matrix layer (100) having a vertical black matrix pattern structure (160) can be positioned between a micro-Fresnel lens array layer (110) and a cover glass (150).

[0097] Referring to FIG. 12d, a black matrix layer (100) having a horizontal black matrix pattern structure (170) may be positioned between the light-emitting element layer (29) and the micro-Fresnel lens array layer (110). Additionally, the black matrix pattern (101) of the black matrix layer (100) may be positioned between the micro-Fresnel lens array layer (110) and the cover glass (150) while being formed to cover the front surface of the light-emitting element layer (29).

[0098]

[0099] This publication has been described with reference to embodiments illustrated in the drawings, but this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible therefrom. Accordingly, the true scope of technical protection of this publication should be determined by the technical concept of the appended claims.

Claims

1. Substrate; A light-emitting element layer comprising a plurality of cells formed on the above substrate; A cover glass provided on the light-emitting element layer; and A micro Fresnel lens array layer formed between the light-emitting element and the cover glass, Display device.

2. In Paragraph 1, The above microFresnel lens array layer includes a plurality of microFresnel lenses, and The above micro Fresnel lens has a plurality of concentric grooves, and Each of the plurality of concentric grooves is formed to have an inclination from the center of the lens to the outer edge of the lens, and the degree of inclination of each of the concentric grooves is different from one another. Display device.

3. In Paragraph 2, Characterized by the angle formed between the inclination of each concentric groove and the lens center plane increasing as one moves from the concentric groove formed at the center of the lens to the concentric groove formed at the outer edge of the lens. Display device.

4. In Paragraph 3, The concentric groove formed in the center of the lens is formed parallel to the center plane of the lens, and The diameter of the concentric groove formed at the center of the lens is less than or equal to 1 / 3 of the diameter of the micro-Fresnel lens, Display device.

5. In Paragraph 2, The length of the inclined surface of each of the plurality of concentric grooves is characterized by increasing from the concentric groove formed at the center of the lens to the concentric groove formed at the outer edge of the lens. Display device.

6. In Paragraph 2, Each of the plurality of micro Fresnel lenses is located on the upper part of each of the cells, Display device.

7. In Paragraph 2, The above cell includes a plurality of sub-cells, and Each of the above plurality of micro Fresnel lenses is located on the upper part of each of the above sub-cells, Display device.

8. In Paragraph 6, The above cell is configured such that a red light subcell, a green light subcell, and a blue light subcell are arranged in a row adjacent to each other, and The light-emitting element layer is characterized by having a structure in which the cells are repeatedly arranged. Display device.

9. In Paragraph 6, The cell is square in shape and is configured such that a red light subcell, two green light subcells, and a blue light subcell are arranged in a 2x2 matrix form. Display device.

10. In Paragraph 6, The above cell is configured such that a red light subcell, a green light subcell, a blue light subcell, and a white light subcell are arranged in an adjacent line. Display device.

11. In Paragraph 6, The above cell is configured such that a red light subcell, a green light subcell, and a blue light subcell are arranged in a row adjacent to each other, and Configured so that the area occupied by the above red light sub-cell, green light sub-cell, and blue light sub-cell is 50% to 60% of the cell area, Display device.

12. In Paragraph 6, Two of the above red light subcell, green light subcell, and blue light subcell are provided at both corners of one side of the cell, and the remaining one subcell is provided at the center of the side opposite to that side, and A structure characterized in that the sub-cells are not in contact when the plurality of cells are in contact. Display device.

13. In Paragraph 12, The length of one side of the above sub-cell is 1 / 3 of the length of one side of the above cell, Display device.

14. In Paragraph 13, The center distance between the sub-cells within each of the above cells is the length of one side of the sub-cell. It is a ship, and, Characterized that the center distance between the closest subcells in a vertical or horizontal direction between the above subcells is twice the length of one side of the above subcell. Display device.

15. In Paragraph 2, It further includes a black matrix layer containing a black matrix (BM) pattern, and The above black matrix patterns are provided on the first and third sides of the cell, or on the second and fourth sides, or are provided to surround the cell, and The black matrix layer is provided between the light-emitting element layer and the micro-Fresnel lens array layer, or between the micro-Fresnel lens array layer and the cover glass. Display device.

16. In Paragraph 2, It further includes a black matrix (BM) layer, and The black matrix layer is configured to cover the entire micro-Fresnel lens array layer, Display device.

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