KR102469498B1 - Display Device - Google Patents

Abstract

The present invention is a display panel; and an optical path adjusting film provided on the display panel, wherein the optical path adjusting film includes a plurality of dome patterns and a cover layer provided on the plurality of dome patterns, The refractive index of the pattern relates to a display device that is different from the refractive index of the cover layer,
According to the present invention, since the light path adjusting film is provided on the upper surface of the display panel, the amount of light for each light wavelength band emitted from the upper surface of the display device is adjusted, thereby reducing the problem of bluish image at a side viewing angle.

Description

Display device {Display Device}

The present invention relates to a display device, and more particularly, to a display device having an optical path adjusting film on the upper surface of a display panel.

Display devices such as a liquid crystal display (LCD) and an electroluminescent display device can easily implement a high resolution and have various advantages as a large screen display device.

Such a display device includes a display panel for realizing an image. The display panel includes a plurality of pixels, and each of the plurality of pixels includes individual sub-pixels implementing individual colors. For example, one pixel may include a red sub-pixel, a green sub-pixel, and a blue sub-pixel.

However, in the conventional case, there is a problem in that image quality deteriorates due to a difference in the amount of light emitted from the display panel for each light wavelength band at a side viewing angle. For example, in the case of an electroluminescent display device, each sub-pixel emits light of an individual color, and when the light emitted from each sub-pixel is emitted to the upper surface of the display panel, the amount of light emitted for each light wavelength band at the side viewing angle is different. may occur, resulting in deterioration of image quality. In particular, an emission amount of short-wavelength light, such as blue, is increased compared to long-wavelength light, such as red, at a side viewing angle, so that a bluish image may be displayed as a whole.

The present invention has been devised to solve the above-mentioned conventional problems, and the present invention provides a display device capable of improving the problem of displaying a bluish image at a side viewing angle by adding a light path adjusting film on the upper surface of a display panel. aims to

In order to achieve the above object, the present invention is a display panel; and an optical path adjusting film provided on the display panel, wherein the optical path adjusting film includes a plurality of dome patterns and a cover layer provided on the plurality of dome patterns, The refractive index of the pattern is different from the refractive index of the cover layer to provide a display device.

The present invention also relates to a display panel including a pixel having a plurality of subpixels; an optical path control film having a first refractive index positioned above the display panel; An optical adhesive film disposed between the display panel and the optical path adjusting film, wherein the optical path adjusting film includes a base film and a plurality of dome patterns disposed on an upper surface of the base film. do.

The present invention also relates to a display panel including a pixel having a plurality of subpixels; an optical path adjustment film positioned above the display panel, having a third refractive index, and including a plurality of intaglio dome patterns on a lower surface thereof; It provides a display device including an optical adhesive film disposed between the display panel and the optical path adjusting film, having a fourth refractive index greater than the third refractive index, and covering the plurality of intaglio dome patterns.

According to an embodiment of the present invention, since the light path adjustment film is provided on the upper surface of the display panel, the amount of light for each wavelength of light emitted from the upper surface of the display device is adjusted, thereby improving the problem of bluish images at the side viewing angle. .

In addition, according to another embodiment of the present invention, an optical path adjustment film is disposed on the display panel to extend the path of light implemented from the display panel to an area corresponding to the non-aperture area, thereby reducing the lattice feeling while maintaining a clear image. have

1 is a schematic diagram of a display device according to an embodiment of the present invention.
2A and 2B illustrate various ways in which an optical path is adjusted for each wavelength band in the display device according to an embodiment of the present invention according to FIG. 1 .
3 is a graph showing color deviation rates according to viewing angles in display devices according to Comparative Examples and Examples.
4 is a graph showing white (W) color coordinate values of display devices according to Comparative Examples and Examples.
5 is a schematic diagram of a display device according to another embodiment of the present invention.
6 is a schematic diagram of a display device according to another embodiment of the present invention.
7 is a schematic diagram of a display device according to another embodiment of the present invention.
8 is a schematic diagram of a display device according to another embodiment of the present invention.
9 is a schematic diagram of a display device according to another embodiment of the present invention.
10 is a plan view showing an arrangement structure of a plurality of dome patterns according to an embodiment of the present invention.
11 is a plan view showing an arrangement structure of a plurality of dome patterns according to another embodiment of the present invention.
12 to 15 are schematic cross-sectional views of display devices according to various embodiments of the present disclosure.
16 is a diagram illustrating an arrangement of subpixels of a display panel according to an embodiment of the present invention.
17 is a diagram schematically illustrating a display device according to another exemplary embodiment of the present invention.
18 is a diagram schematically illustrating an arrangement of subpixels of a display panel according to another embodiment of the present invention.
19 is a schematic plan view of a display device according to another embodiment of the present invention.
FIG. 20 is a schematic cross-sectional view of V-V of FIG. 19 .
21 is a view schematically showing a path of light when an optical path adjusting film according to another embodiment of the present invention is disposed.
22A is a view schematically showing a cross section in which an optical path adjusting film according to another embodiment of the present invention is disposed in a subpixel.
22B is a view schematically illustrating a path of light when an optical path adjusting film according to another embodiment of the present invention is disposed.
23A is a view schematically illustrating a cross section in which an optical path adjusting film and an optical adhesive film according to another embodiment of the present invention are disposed in subpixels.
23B is a diagram schematically illustrating a path of light when an optical path adjusting film and an optical adhesive film are disposed according to another embodiment of the present invention.
24 is a diagram schematically showing a state in which subpixels are enlarged to an area corresponding to a non-aperture area according to an embodiment of the present invention.
FIG. 25A is a photograph showing a lattice feeling according to a non-opening area of a subpixel shown in FIG. 1 .
25B is a photograph in which the lattice feeling is improved according to another embodiment of the present invention.
26A to 26C are diagrams schematically showing modified examples of the dome pattern according to the embodiment of the present invention.
27 is a photograph showing a change in lattice feeling according to the height of a dome pattern according to another embodiment of the present invention.
28A is a diagram referenced to explain a pattern fill factor.
28B is a photograph showing a change in lattice feeling according to a change in pattern fill factor.
29a and 29b are photographs showing chromatic dispersion according to the diameter of a dome pattern according to another embodiment of the present invention.
30 schematically illustrates an example of a display device according to an embodiment of the present invention, and is an example including an organic light emitting diode panel.
31 is a diagram schematically illustrating an example of a display device according to an embodiment of the present invention, and is an example including a liquid crystal panel.

Advantages and features of the present invention, and methods of achieving them, will become clear with reference to the detailed description of the following embodiments taken in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and only the present embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention belongs. It is provided to fully inform the holder of the scope of the invention, and the present invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present invention are illustrative, so the present invention is not limited to the details shown. Like reference numbers designate like elements throughout the specification. In addition, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. When 'includes', 'has', 'consists of', etc. mentioned in this specification is used, other parts may be added unless 'only' is used. In the case where a component is expressed in the singular, the case including the plural is included unless otherwise explicitly stated.

In interpreting the components, even if there is no separate explicit description, it is interpreted as including the error range.

In the case of a description of a positional relationship, for example, 'on top of', 'on top of', 'at the bottom of', 'next to', etc. Or, unless 'directly' is used, one or more other parts may be located between the two parts.

In the case of a description of a temporal relationship, for example, 'immediately' or 'directly' when a temporal precedence relationship is described in terms of 'after', 'following', 'next to', 'before', etc. It can also include non-continuous cases unless is used.

Although first, second, etc. are used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from another. Therefore, the first component mentioned below may also be the second component within the technical spirit of the present invention.

Each feature of the various embodiments of the present invention can be partially or entirely combined or combined with each other, technically various interlocking and driving are possible, and each embodiment can be implemented independently of each other or can be implemented together in a related relationship. may be

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

1 is a schematic diagram of a display device according to an embodiment of the present invention.

As can be seen in FIG. 1 , a display device according to an embodiment of the present invention includes a display panel 10 and an optical path adjustment film 20 .

The display panel 10 may be formed of an electroluminescent display panel known in the art, but is not necessarily limited thereto. When the display panel 10 is made of an electroluminescence display panel, the electroluminescence display panel is made of a top emission type in which light emitted from a light emitting layer is emitted upward.

The optical path adjusting film 20 is formed on the upper surface of the display panel 10 . The optical path adjusting film 20 includes a base layer 21 , a plurality of dome patterns 23 , and a cover layer 25 .

The base layer 21 is made of a transparent material and may have a flat upper and lower surface.

The plurality of dome patterns 23 are formed in a convex pattern on the upper surface of the base layer 21 . The plurality of dome patterns 23 may be spaced apart from each other at a predetermined interval, but is not necessarily limited thereto, and the plurality of dome patterns 23 may be formed to contact each other.

The upper surface of each of the plurality of dome patterns 23 is provided to have a curved cross-sectional structure such as an arcuate shape, and the cross-sectional structure of each of the plurality of dome patterns 23 may be identical to each other. At this time, the ratio of the height (H) / diameter (D) of each of the plurality of dome patterns 23 may be in the range of 0.05 to 2. If the ratio of the height (H)/diameter (D) of the dome pattern 23 is out of the above range, an optical path changing effect for each optical wavelength band may not be obtained as shown in FIGS. 2A and 2B described later.

The plurality of dome patterns 23 may be formed through a process of applying a predetermined material layer on the base layer 21 and then pressing the predetermined material layer using a stamper. In this case, the stamper has a concave pattern corresponding to the plurality of dome patterns 23 . However, it is not necessarily limited thereto, and it is also possible to form the base layer 21 and the plurality of dome patterns 23 as one body. The base layer 21 and the plurality of dome patterns 23 may be made of the same material.

The cover layer 25 is formed on upper surfaces of the plurality of dome patterns 23 . The lower surface of the cover layer 25 is in contact with the upper surface of the plurality of dome patterns 23 and the upper surface of the base layer 21 on which the plurality of dome patterns 23 are not formed. An upper surface of the cover layer 25 may be provided with a flat surface.

The cover layer 25 is made of a material different from that of the plurality of dome patterns 23 . The cover layer 25 may be made of a material having a higher refractive index than the plurality of dome patterns 23 or a material having a lower refractive index than the plurality of dome patterns 23 .

As such, the light path adjustment film 20 including the base layer 21, the plurality of dome patterns 23, and the cover layer 25 is fixed on the upper surface of the display panel 10 using a predetermined adhesive layer. It can be.

However, it is not necessarily limited thereto, and it is also possible to fix the light path adjustment film 20 on the upper surface of the display panel 10 without a separate adhesive layer. In this case, the base layer 21 may be directly applied on the upper surface of the display panel 10, and then the plurality of dome patterns 23 and the cover layer 25 may be sequentially formed. The base layer 21 and the plurality of dome patterns 23 may be formed directly on the upper surface of the display panel 10 at the same time, and then the cover layer 25 may be formed. In some cases, it is also possible to directly form the plurality of dome patterns 23 on the upper surface of the display panel 10 without a separate adhesive layer and then form the cover layer 25 thereon. That is, it is also possible that the optical path adjustment film 20 does not include the base layer 21 . When the display panel 10 is made of an electroluminescent display panel, the optical path adjusting film 20 may be directly formed on the encapsulation layer of the display panel 10 without an adhesive layer.

According to one embodiment of the present invention, the light emitted from the display panel 10 and then incident on the light path adjusting film 20 is emitted from the interface between the plurality of dome patterns 23 and the cover layer 25. It is first refracted and secondarily refracted on the upper surface of the cover layer 25 and emitted to the upper surface of the light path adjustment film 20. At this time, the refractive index of the emitted light is adjusted for each light wavelength band to make the image bluish at the side viewing angle The visible problem can be improved, which will be described with reference to FIGS. 2A and 2B.

2A and 2B illustrate various ways in which an optical path is adjusted for each wavelength band in the display device according to an embodiment of the present invention according to FIG. 1 .

2A corresponds to a case where the plurality of dome patterns 23 have a low refractive index and the cover layer 25 has a high refractive index.

As can be seen in FIG. 2A , the light emitted from the display panel 10 and then incident on the light path control film 20 passes through the interface between the base layer 21 and the plurality of dome patterns 23 having the same refractive index. penetrate

Thereafter, when the plurality of dome patterns 23 having a low refractive index go to the cover layer 25 having a high refractive index, the refraction of light is different for each wavelength at the interface between the two dome patterns 23 . Specifically, light (①) of a short wavelength band such as blue is refracted in a direction forming a first angle θ1 with the upper surface of the cover layer 25, and light (②) of a long wavelength band such as red is refracted to the upper surface of the cover layer 25 . ) is refracted in a direction forming a second angle θ2 with the upper surface. That is, light (①) of the short wavelength band is refracted more vertically than light (②) of the long wavelength band while passing through the interface between the plurality of dome patterns 23 and the cover layer 25 .

Then, the short wavelength light (①) and the long wavelength light (②) refracted at the interface between the plurality of dome patterns 23 and the cover layer 25 are refracted again on the upper surface of the cover layer 25. . At this time, the upper part of the cover layer 25 may be made of an air layer or a material layer having a lower refractive index than the cover layer 25, and accordingly, the light (①) of the short wavelength band may be formed of the cover layer 25 The upper surface of the cover layer 25 is emitted in a direction forming a third angle θ3, and the long wavelength band light ② is emitted in a direction forming a fourth angle θ4 with the upper surface of the cover layer 25 .

As a result, a third angle θ3 at which the short wavelength light ① is emitted from the upper surface of the cover layer 25 is a fourth angle at which the long wavelength light ② is emitted from the upper surface of the cover layer 25 . It becomes larger than (θ4). Therefore, the emission amount of the long-wavelength light ② may be increased compared to the short-wavelength light ① in the side viewing angle direction, and thus, the bluish image of the display device may be improved.

2B corresponds to a case where the plurality of dome patterns 23 have a high refractive index and the cover layer 25 has a low refractive index.

As can be seen in FIG. 2B , the light emitted from the display panel 10 and then incident on the light path adjustment film 20 passes through the interface between the base layer 21 and the plurality of dome patterns 23 having the same refractive index. penetrate

Thereafter, when the plurality of dome patterns 23 having a high refractive index go to the cover layer 25 having a low refractive index, the refraction of light is different for each wavelength at the interface between the two dome patterns 23 . Specifically, light (①) of a short wavelength band such as blue is refracted in a direction forming a first angle θ1 with the upper surface of the cover layer 25, and light (②) of a long wavelength band such as red is refracted to the upper surface of the cover layer 25 . ) is refracted in a direction forming a second angle θ2 with the upper surface. That is, the long-wavelength light (②) is refracted more vertically than the short-wavelength light (①) while passing through the interface between the plurality of dome patterns 23 and the cover layer 25.

Then, the short wavelength light (①) and the long wavelength light (②) refracted at the interface between the plurality of dome patterns 23 and the cover layer 25 are refracted again on the upper surface of the cover layer 25. .

At this time, since the first angle θ1 formed by the short wavelength light ① with the upper surface of the cover layer 25 is small, the short wavelength light ① is emitted from the upper surface of the cover layer 25 to the outside. Otherwise, total reflection may occur on the upper surface of the cover layer 25 . In contrast, since the second angle θ2 formed by the long-wavelength light ② with the upper surface of the cover layer 25 is greater than the first angle θ1), the long-wavelength light ② is formed on the cover layer 25. The light is emitted in a direction forming a third angle θ3 with the upper surface of the layer 25 .

Therefore, the emission amount of the long wavelength light ② may be increased compared to the short wavelength light ① at the side viewing angle, and thus, the bluish image of the display device may be improved.

As can be seen from FIGS. 2A and 2B above, according to an embodiment of the present invention, the plurality of dome patterns 23 and the refractive indices of the cover layer 25 are properly adjusted, so that the upper surface of the cover layer 25 The amount of light for each light wavelength band emitted can be adjusted, so that the problem of bluish image at the side viewing angle can be improved. That is, the present invention improves image quality of a display device by using the characteristic of having different refraction patterns for each light wavelength band when light passes through an interface between a high refractive index layer and a low refractive index layer.

Meanwhile, a difference in refractive index between the plurality of dome patterns 23 and the cover layer 25 may preferably be in the range of 0.05 to 0.4. If the refractive index difference is out of the range, the amount of emission of long wavelength light (②) in the structure of FIG. ) may decrease the effect of improving the problem that the image becomes bluish due to an increase in the emission amount.

When the light path adjusting film 20 is not provided, a bluish image is displayed on the display panel 10 at a side viewing angle. In this case, the emission amount of long-wavelength light can be increased rather than short-wavelength light at the side viewing angle, so that the bluish image problem generated in the display panel 10 at the side viewing angle is adjusted while passing through the optical path adjustment film 20 As a result, a high-quality image can finally be displayed.

3 is a graph showing color deviation rates according to viewing angles in display devices according to Comparative Examples and Examples, and FIG. 4 is a graph showing white (W) color coordinate values of display devices according to Comparative Examples and Examples.

In FIGS. 3 and 4 , the comparative example is an experiment using an electroluminescent display panel not provided with an optical path adjusting film, and the embodiment is an optical path adjusting film according to FIG. 1 on the upper surface of the electroluminescent display panel according to the comparative example. was formed and tested.

In FIG. 3 , the horizontal axis is the viewing angle and the vertical axis is the color deviation rate. That is, the horizontal axis represents the side viewing angle that increases left and right with the front viewing angle at zero degrees, and the vertical axis represents the deviation rate between the color coordinate value at the front viewing angle and the color coordinate value at the side viewing angle for each viewing angle.

As can be seen in FIG. 3 , in the case of the comparative example, it can be seen that the color deviation rate is very large when the side viewing angle is 60 degrees. In contrast, in the case of the embodiment, it can be seen that the color deviation rate is greatly reduced compared to the comparative example when the side viewing angle is 60 degrees. That is, in the case of the comparative example, it can be seen that the difference between the white color at the side viewing angle and the white color at the front viewing angle is large. In contrast, in the case of the embodiment, it can be seen that the difference between the white color at the side viewing angle and the white color at the front viewing angle is relatively small.

As can be seen in FIG. 4 , in the case of the comparative example, it can be seen that the white color has moved a lot from the pure white (W) color coordinates to the left. Therefore, in the case of the comparative example, it can be seen that the problem of the image appearing bluish occurs. On the other hand, in the case of the examples, as it can be seen that the white color is closer to the pure white (W) color coordinates than in the case of the comparative example, therefore, in the case of the example, compared to the case of the comparative example, it can be seen that the problem of the image being bluish is improved. have.

5 is a schematic diagram of a display device according to another embodiment of the present invention. 5 is the same as the display device according to FIG. 1 except that the cover layer 25 is composed of a first cover layer 25a and a second cover layer 25b. Therefore, the same reference numerals are assigned to the same components, and different configurations will be described below.

As can be seen in FIG. 5 , the light path adjusting film 20 provided on the upper surface of the display panel 10 includes a base layer 21, a plurality of dome patterns 23, and a cover layer 25. .

At this time, the cover layer 25 includes a first cover layer 25a and a second cover layer 25b. The first cover layer 25a is formed on the upper surface of the plurality of dome patterns 23, and the second cover layer 25b is formed on the upper surface of the first cover layer 25a.

The first cover layer 25a has a cross-sectional structure of an upper surface corresponding to that of the upper surface of the dome pattern 23 . That is, the upper surface of the first cover layer 25a may be formed to have a curved cross-sectional structure. The plurality of first cover layers 25a may be individually formed on the upper surfaces of the plurality of dome patterns 23 while being spaced apart from each other, but are not necessarily limited thereto, and one first cover layer 25a may be formed on the plurality of dome patterns 23. It may be continuously formed on the upper surface of the dome pattern 23 and the upper surface of the base layer 21 .

In the structure according to FIG. 5, the plurality of dome patterns 23 are made of a material having a lower refractive index than the first cover layer 25a, and the second cover layer 25b is the first cover layer 25a. ) may be made of a material having a lower refractive index than Alternatively, the plurality of dome patterns 23 are made of a material having a higher refractive index than the first cover layer 25a and the second cover layer 25b has a higher refractive index than the first cover layer 25a. It can also be made of material.

According to another embodiment of the present invention, the light incident on the optical path adjustment film 20 sequentially passes through the low refractive index layer, the high refractive index layer, and the low refractive index layer, or sequentially passes through the high refractive index layer, the low refractive index layer, and the high refractive index layer. Therefore, by properly changing the refractive index of each layer, it is possible to more precisely control the amount of light for each light wavelength band emitted to the upper surface of the optical path adjusting film 20, thereby more effectively improving the problem of bluish images at the side viewing angle. have.

6 is a schematic diagram of a display device according to another embodiment of the present invention. 6 is the same as the display device according to FIG. 1 except for the structure of the dome pattern 23 being changed. Therefore, the same reference numerals are assigned to the same components, and different configurations will be described below.

As can be seen in FIG. 6 , the light path adjusting film 20 provided on the upper surface of the display panel 10 includes a base layer 21, a plurality of dome patterns 23, and a cover layer 25. .

At this time, the cross-sectional structure of the upper surface of the plurality of dome patterns 23 is different from that of FIG. 1 described above. That is, according to FIG. 6, a part of the upper surface of the dome pattern 23 is made of a flat surface 23a and the rest of the upper surface of the dome pattern 23 is made of a curved surface 23b. The flat surface 23a corresponds to the center area of the upper surface of the dome pattern 23, and the curved surface 23b corresponds to the edge area of the upper surface of the dome pattern 23.

According to FIG. 6, since the upper surface of the dome pattern 23 has a flat surface 23a, the amount of light passing through the upper surface of the dome pattern 23 and emitted through the light path adjusting film 20 increases. As a result, the luminance of the display device may be improved.

7 is a schematic diagram of a display device according to another embodiment of the present invention.

As can be seen in FIG. 7 , a display device according to another embodiment of the present invention includes a display panel 10 and an optical path adjustment film 20 provided on an upper surface of the display panel 10 .

The optical path adjusting film 20 includes a base layer 21 and a cover layer 25 .

A plurality of dome patterns 23 are formed on the upper surface of the base layer 21 . The plurality of dome patterns 23 have a concave pattern structure formed inside the base layer 21 . The lower surfaces of the plurality of dome patterns 23 are provided to have a curved cross-sectional structure such as an arcuate shape, and the cross-sectional structures of the lower surfaces of each of the plurality of dome patterns 23 may be identical to each other. Since the plurality of dome patterns 23 have a concave pattern structure formed inside the base layer 21, the lower surface of the plurality of dome patterns 23 constitutes a part of the upper surface of the base layer 21. will do

The cover layer 25 is formed on the upper surface of the base layer 21 . The cover layer 25 is formed to fill the interior of the plurality of dome patterns 23 formed of the concave patterns. Accordingly, the lower surface of the cover layer 25 comes into contact with the upper surface of the base layer 21 and, in particular, the lower surface of the plurality of dome patterns 23 . An upper surface of the cover layer 25 may be provided with a flat surface.

The cover layer 25 is made of a material different from that of the base layer 21 . The cover layer 25 may be made of a material having a higher refractive index than the base layer 21 or a material having a lower refractive index than the base layer 21 .

As such, the light path adjustment film 20 including the base layer 21 and the cover layer 25 may be attached to the upper surface of the display panel 10 using a predetermined adhesive layer.

However, it is not necessarily limited thereto, and it is also possible to form the optical path adjusting film 20 on the upper surface of the display panel 10 without a separate adhesive layer. In this case, the base layer 21 may be directly applied on the upper surface of the display panel 10 and the cover layer 25 may be formed thereafter.

8 is a schematic diagram of a display device according to another embodiment of the present invention. 8 is the same as the display device according to FIG. 7 except that the cover layer 25 is composed of the first cover layer 25a and the second cover layer 25b. Therefore, the same reference numerals are assigned to the same components, and different configurations will be described below.

As can be seen in FIG. 8 , the light path adjusting film 20 provided on the upper surface of the display panel 10 includes a base layer 21 and a cover layer 25 .

At this time, the cover layer 25 includes a first cover layer 25a and a second cover layer 25b. The first cover layer 25a is formed on the upper surface of the base layer 21, and the second cover layer 25b is formed on the upper surface of the first cover layer 25a.

The first cover layer 25a has a cross-sectional structure of the lower surface corresponding to the cross-sectional structure of the lower surface of the dome pattern 23 provided in the concave pattern structure inside the base layer 21 . That is, the lower surface of the first cover layer 25a may be formed to have a curved cross-sectional structure. Although the first cover layer 25a may be continuously formed on the entire upper surface of the base layer 21 including the upper surface of the plurality of dome patterns 23, in some cases, the plurality of first cover layers 25a The dome patterns 23 may be individually formed on the upper surfaces of the plurality of dome patterns 23 while being spaced apart from each other.

In the structure according to FIG. 8 , the base layer 21 is made of a material having a lower refractive index than the first cover layer 25a and the second cover layer 25b is made of a material having a lower refractive index than the first cover layer 25a. It may be made of a material having a low refractive index. Alternatively, the base layer 21 is made of a material having a higher refractive index than the first cover layer 25a and the second cover layer 25b is made of a material having a higher refractive index than the first cover layer 25a. may be done

9 is a schematic diagram of a display device according to another embodiment of the present invention. 9 is the same as the display device according to FIG. 7 except that the structure of the dome pattern 23 is changed. Therefore, the same reference numerals are assigned to the same components, and different configurations will be described below.

As can be seen in FIG. 9 , the light path adjusting film 20 provided on the upper surface of the display panel 10 includes a base layer 21 having a plurality of dome patterns 23 and a cover layer 25. It is done by

At this time, the cross-sectional structure of the lower surface of the plurality of dome patterns 23 is different from that of FIG. 7 described above. That is, according to FIG. 9 , a part of the lower surface of the dome pattern 23 is made of a flat surface 23a and the rest of the lower surface of the dome pattern 23 is made of a curved surface 23b. The flat surface 23a corresponds to a central region of the lower surface of the dome pattern 23, and the curved surface 23b corresponds to an edge region of the lower surface of the dome pattern 23.

According to FIG. 9, since the lower surface of the dome pattern 23 has a flat surface 23a, the amount of light passing through the lower surface of the dome pattern 23 and emitted through the light path adjusting film 20 increases. As a result, the luminance of the display device may be improved.

10 is a plan view showing an arrangement structure of a plurality of dome patterns according to an embodiment of the present invention.

As can be seen in FIG. 10 , a plurality of dome patterns 23 are formed on the base layer 21 . The plurality of dome patterns 23 may have a circular structure on a plane, but are not necessarily limited thereto, and may have an elliptical structure or, in some cases, a polygonal structure such as a pentagon or a hexagon.

Each of the plurality of dome patterns 23 may have the same diameter D, and accordingly, the plurality of dome patterns 23 may have the same size. At this time, the diameter D of each of the plurality of dome patterns 23 may be set in the range of 1 μm to 20 μm. If the diameter D of each of the plurality of dome patterns 23 is out of the above range, the optical path changing effect for each light wavelength band according to the present invention may not be obtained. All of the pitches P1 between the plurality of dome patterns 23 may be formed to be the same, and accordingly, the plurality of dome patterns 23 may be regularly arranged in a plurality of matrices.

A pattern fill factor corresponding to the ratio of the total area of the plurality of dome patterns 23 to the total area of the base layer 21 may be formed in a range of 20 to 100%. If the pattern filling ratio is less than 20%, the optical path changing effect for each optical wavelength band according to the present invention may not be obtained.

The pattern filling rate can be changed by adjusting the pitch P between the plurality of dome patterns 23 . For example, when the pitch (P) between the plurality of dome patterns 23 is formed to be the same as the diameter (D) of the dome patterns 23, the plurality of dome patterns 23 come into contact with each other and the The pattern filling rate can be increased. When the plurality of dome patterns 23 are formed in a circular or elliptical structure on a plane, the pattern filling rate can be increased by making the diameter D of the plurality of dome patterns 23 small. Even so, when the plurality of dome patterns 23 are formed in a circular or elliptical structure on a plane, the pattern filling rate cannot be 100%. In order to form the pattern filling rate to 100%, it is sufficient to form a planar structure of the plurality of dome patterns 23 into a polygonal structure and place the plurality of dome patterns 23 having such a polygonal structure in contact with each other.

11 is a plan view showing an arrangement structure of a plurality of dome patterns according to another embodiment of the present invention.

According to FIG. 10 described above, a plurality of dome patterns 23 have the same diameter D and are regularly arranged at the same pitch P. In contrast, according to FIG. 11 , a plurality of dome patterns 23 have different diameters D1 and D2 and are irregularly arranged at different pitches P1 , P2 , P3 , P4 and P5 .

That is, according to FIG. 11 , the first diameter D1 of one dome pattern 23 is different from the second diameter D2 of the other dome pattern 23 . That is, the plurality of dome patterns 23 include at least two dome patterns 23 having different sizes. In addition, at least two pitches (P1, P2, P3, P4, P5) are different from each other.

As described above, according to another embodiment of the present invention, the diameters D1 and D2 of the plurality of dome patterns 23 are different from each other and the pitches P1, P2, P3, P4, and P5 are different from each other, so that the plurality of dome patterns 23 are different from each other. (23) is not a regular matrix arrangement, but an irregular arrangement. As in other embodiments of the present invention, when the plurality of dome patterns 23 are irregularly arranged, there is an advantage in reducing the moiré phenomenon.

12 to 15 are schematic cross-sectional views of display devices according to various embodiments of the present disclosure. Each will be described below.

As can be seen in FIG. 12 , a display device according to another embodiment of the present invention includes a display panel 10 and an optical path adjusting film 20 .

The display panel 10 includes a substrate 1, a circuit element layer 2, an anode 3, a bank 4, a light emitting layer 5, a cathode 6, and an encapsulation layer 7. It consists of a display panel.

The circuit element layer 2 is formed on the upper surface of the substrate 1 . In the circuit element layer 2, various signal lines, thin film transistors, and capacitors are formed. The anode 3 is formed on the upper surface of the circuit element layer 2 . The anode 3 is patterned for each pixel. The bank 4 is formed on the upper surface of the circuit element layer 2 while covering both ends of the anode 3 . The bank 4 is formed in a matrix structure to define a plurality of light emitting regions. The light emitting layer 5 is formed in a plurality of light emitting regions defined by the banks 4 . The cathode 6 is formed on the upper surface of the light emitting layer 5 . The cathode 6 may also be formed on the upper surface of the bank 4, and thus may be formed in all of the plurality of pixels. The encapsulation layer 7 is formed on the upper surface of the cathode 6 . The encapsulation layer 7 prevents penetration of external moisture into the light emitting layer 5 .

Such an electroluminescent display panel may be modified into various structures known in the art.

The optical path adjusting film 20 is formed on the upper surface of the display panel 10 . Specifically, the optical path adjustment film 20 may be formed on the upper surface of the encapsulation layer 7 . The light path adjusting film 20 may have a structure according to various embodiments described above.

In the display device according to FIGS. 13 to 15 , a polarizing film 30 and a cover film 40 are additionally formed on the upper surface of the display panel 10 . The polarizing film 30 serves to prevent reflection of external light, and the cover film 40 protects the polarizing film 30 . The cover film 40 may be made of a transparent material such as glass.

As shown in FIG. 13 , the light path adjusting film 20 according to various embodiments described above may be formed between the display panel 10 and the polarizing film 30 . In this case, the optical path adjusting film 20 , the polarizing film 30 , and the cover film 40 are sequentially stacked on the upper surface of the display panel 10 .

As shown in FIG. 14 , the optical path adjusting film 20 according to various embodiments described above may be formed between the polarizing film 30 and the cover film 40 . In this case, the polarizing film 30 , the light path adjusting film 20 , and the cover film 40 are sequentially stacked on the upper surface of the display panel 10 .

As shown in FIG. 15 , the optical path adjusting film 20 according to various embodiments described above may be formed on the upper surface of the cover film 40 . In this case, the polarizing film 30 , the cover film 40 , and the optical path adjusting film 20 are sequentially stacked on the upper surface of the display panel 10 .

As described above, according to the present invention, since the light path adjustment film 20 is provided on the upper surface of the display panel 10, the refractive index of the emitted light is adjusted for each light wavelength band, so that the problem of the image appearing bluish at the side viewing angle can be improved. . In addition, according to the present invention, by providing the light path adjustment film 20 on the upper surface of the display panel 10, the problem of grid feeling in the image or the blurring of the image can be further improved, A description of it is as follows.

16 is a diagram illustrating an arrangement of sub-pixels of a display panel according to an embodiment of the present invention.

As shown in FIG. 16 , the display panel 11 configures a pixel P by using red subpixels Pr, green subpixels Pg, and blue subpixels Pb, each of which is a plurality of subpixels. Various color images are displayed through the pixels P of .

In addition, each sub-pixel (Pr, Pg, Pb) has an open area (A1) and a non-open area (A2), and light (light) is output from the sub-pixel (Pr, Pg, Pb) in the open area (A1). and the non-opening area A2 is an area in which light is not output from the subpixels Pr, Pg, and Pb.

The non-opening area A2 is perceived by a viewer as a lattice form (lattice feeling) by connecting the non-opening area A2 into one, which may be a factor in deteriorating the image quality of the display device.

However, since there is a certain limit to reducing the non-opening area A2 of the subpixels Pr, Pg, and Pb on the process margin, a method capable of reducing the lattice feeling while maintaining a clear image is required. In particular, in viewing a VR (Virtual Reality) device, since the image is viewed with the eyes close to the screen, the grid feeling and image blur are more prominently recognized, and a solution to this problem is needed.

17 is a diagram schematically illustrating a display device according to another exemplary embodiment of the present invention.

Referring to FIG. 17 , a display device 100 according to another embodiment of the present invention includes a display panel 110 including a pixel having a plurality of subpixels, and a first display panel positioned above the display panel 110. It includes an optical path adjusting film 120 having a refractive index and an optical adhesive film 130 disposed between the display panel 110 and the optical path adjusting film 120.

Here, the optical path adjustment film 120 includes a base film 123 and a plurality of dome patterns 121 disposed on the upper surface of the base film 123 .

That is, a plurality of dome patterns 121 may be disposed on the upper surface of the base film 123, and an optical adhesive film 130 may be disposed on the lower surface opposite to the upper surface. In addition, the optical path adjusting film 120 and the display panel 110 may be bonded through the optical adhesive film 130 .

Also, the dome pattern 121 may be formed smaller than subpixels (Pr, Pg, and Pb in FIG. 1). A plurality of dome patterns 121 may correspond to one sub-pixel (Pr, Pg, and Pb in FIG. 1 ).

Here, in order to prevent the light output from the subpixels (Pr, Pg, and Pb in FIG. 1) from being output as it is to empty spaces between the plurality of dome patterns 121 and being viewed like chromatic dispersion, the light path adjustment film 120 The diameter (D) of each dome pattern 121 included in ) may be formed larger than the separation distance (d) between the dome patterns 121 . For example, the diameter (D) of each dome pattern 121 may be 1 μm to 20 μm or less, and the separation distance (d) between the dome patterns 121 may be 5 μm or less, but is not limited thereto. not.

In addition, the ratio of the height (H) / diameter (D) of the dome pattern 121 may be 0.05 to 2, preferably in order to maintain a clear image of the display device 100 and prevent a lattice feeling from being recognized. The height (H) may be smaller than the diameter (D), and the ratio of the height (H) / diameter (D) may be made of 0.1 to 0.5, but is not limited thereto.

Here, the light path adjusting film 120 may be made of resin. For example, it may be made of polyethylene terephthalate (PET), polycarbonate (PC), or acrylic (ACRYL)-based materials, but is not limited thereto.

In addition, the optically clear adhesive 130 may be made of resin and may be a double-sided adhesive tape coated with an optically clear adhesive, but is not limited thereto.

The display device 100 according to another embodiment of the present invention can adjust the path of light output from the display panel 110 using the optical path adjusting film 120. ) Path adjustment of the light through will be described later.

18 is a diagram schematically illustrating an arrangement of subpixels of a display panel according to another embodiment of the present invention.

As shown in FIG. 18, red subpixels (R) and blue subpixels (B) are alternately formed in the same column, and green subpixels (G) are formed in an adjacent column to be arranged in a Pentile structure. can However, it is not limited thereto. Each subpixel 111 may include an open area 111a and a non-open area 111b.

Here, the open area 111a is an area from which light is output from the subpixel 111, and the non-open area 111b is an area from the subpixel 111 to which light is not output.

The non-opening area 111b is a factor that causes a lattice feeling and degrades image quality, but it is a gate wire, data wire and thin film transistor (TFT) for driving the subpixel 111 in the display panel (110 in FIG. 2). Because it is an area where the back is formed, there is a certain limit to reducing the non-opening area 111b on the process margin.

19 is a schematic plan view of a display device according to another embodiment of the present invention.

As shown in FIG. 19 , in the arrangement of the subpixels 111 having a Pentile structure, an optical path adjusting film 120 may be disposed on the subpixels 111 .

As described above, each subpixel 111 includes an open area 111a through which light is output and a non-opened area 111b through which light is not output, and the dome pattern included in the light path adjusting film 120 ( 121) may be disposed in plurality on each subpixel 111.

Also, as shown, the plurality of dome patterns 121 may be uniformly arranged, but may also be non-uniformly arranged.

As such, since the light path adjusting film 120 according to another embodiment of the present invention has a fine dome pattern 121, the opening area 111a of the subpixel 111 of the display panel (110 in FIG. 17) and the light path There is no need to align the dome pattern 121 of the adjustment film 120, so the process can be simplified.

FIG. 20 is a schematic cross-sectional view of V-V of FIG. 19 .

As shown in FIG. 20, one subpixel 111 including an open area 111a and a non-opening area 111b, an optical adhesive film 130 on top of one subpixel 111, An optical path control film 120 having a first refractive index may be disposed on the optical adhesive film 130 .

In addition, the light path adjusting film 120 may include a base film 123 and a plurality of dome patterns 121 formed on an upper surface of the base film 123 .

In addition, the optical welding tape 130 is disposed on the lower surface opposite to the upper surface of the base film 123 to bond the optical path adjustment film 120 and the display panel ( 110 in FIG. 2 ).

21 is a view schematically illustrating a path of light when an optical path adjusting film according to another embodiment of the present invention is disposed.

As shown in FIG. 21, light is not output from the non-aperture area 111b of the sub-pixel 111, and the light output from the aperture area 111a is refracted while passing through the optical path adjustment film 120 and output. It can be seen that the range is expanded to an area corresponding to the non-opening area 111b.

Here, an air layer having a refractive index smaller than the first refractive index may be present on the optical path adjustment film 120 . For example, the air layer may have a refractive index of 1 and a first refractive index of 1.5 or 1.6, but is not limited thereto.

That is, light output in a direction not visible to the human eye in the opening area 111a of the subpixel 111 passes through the optical path adjustment film 120, thereby forming the dome pattern 121 and the upper portion of the dome pattern 121. Due to the difference in refractive index of the air layer, light is refracted in a vertical direction, and light is output not only in the open area 111a but also in the area corresponding to the non-opening area 111b.

Accordingly, the output range of the subpixel 111 can be expanded to an area corresponding to the non-opening area 111b.

Furthermore, the output range of the light output from the aperture area 111a may be further expanded by diffraction while passing through the optical path adjusting film 120 .

Therefore, when the light output from the sub-pixel 111 passes through the optical path adjusting film 120, it is output to an area corresponding to the opening area 111a of the sub-pixel 111 and at the same time the light emitted from the sub-pixel 111 Since the area corresponding to the non-opening area 111b can also be output by adjusting the light path, the area corresponding to the non-opening area 111b of the sub-pixel 111 is connected and recognized in a grid form. It is possible to maintain a clear image while reducing the lattice feeling.

As described above, the display device (100 in FIG. 19) according to another embodiment of the present invention includes a light path adjusting film 120 including a plurality of dome patterns 121 on the display panel (110 in FIG. 17). By arranging, it is possible to expand the light output from the opening area 111a of each subpixel 111 to the area corresponding to the non-opening area 111b.

Accordingly, it is possible to effectively improve the lattice feeling and image blur of VR (Virtual Reality) devices in which the screen and the eyes are close to each other to view images.

Hereinafter, a detailed description of the same or similar configuration as the above-described embodiment may be omitted.

22A is a view schematically illustrating a cross-section in which an optical path adjusting film according to another embodiment of the present invention is disposed in a subpixel, and FIG. 22B is a case where an optical path adjustment film according to another embodiment of the present invention is disposed. It is a diagram schematically showing the path of light.

As shown in FIG. 22A, one subpixel 211 including an open area 211a and a non-opening area 211b, an optical adhesive film 230 on top of one subpixel 211, An optical path adjustment film 220 may be disposed on the optical adhesive film 230 .

The light path adjusting film 220 according to another embodiment of the present invention covers a base film 223, a plurality of dome patterns 221 formed on the upper surface of the base film 223, and a plurality of dome patterns 221. A cover layer 225 may be included.

That is, the lower surface of the cover layer 225 may be formed to cover the plurality of dome patterns 221, and the upper surface opposite to the lower surface of the cover layer 225 may be formed flat.

In addition, an optical adhesive film 230 is disposed on the lower surface opposite to the upper surface of the base film 223 to bond the optical path adjustment film 220 and the display panel ( 110 in FIG. 17 ).

In particular, the base film 223 and the plurality of dome patterns 221 of the light path adjusting film 220 according to another embodiment of the present invention have a first refractive index, and the cover layer 225 has a lower refractive index than the first refractive index. It may have a second refractive index. For example, the first refractive index may be 1.5 or 1.6, and the second refractive index may be 1.1 to 1.4, but is not limited thereto.

Also, the light path adjusting film 220 may be made of resin. For example, it may be made of polyethylene terephthalate (PET), polycarbonate (PC), or acrylic (ACRYL)-based materials, but is not limited thereto.

In addition, the optically clear adhesive 230 may be made of resin and may be a double-sided adhesive tape coated with an optically clear adhesive, but is not limited thereto.

In addition, each dome included in the light path adjusting film 220 prevents light output from the subpixel 211 from being output to empty spaces between the plurality of dome patterns 221 and being viewed as chromatic dispersion. The diameter (D) of the pattern 221 may be larger than the separation distance (d) between the dome patterns 221 . For example, the diameter (D) of each dome pattern 221 may be 1 μm to 20 μm or less, and the separation distance (d) between the dome patterns 221 may be 5 μm or less, but is not limited thereto. not.

The light path adjustment film 220 according to another embodiment of the present invention is a cover layer having a refractive index smaller than that of the base film 223 and the plurality of dome patterns 221 on top of the base film 223 and the plurality of dome patterns 221 . 225, the height H of the dome pattern 221 should be higher than that of the above-described embodiment in order to adjust the path of light in the same way as in the above-described embodiment.

Therefore, the height H of the dome pattern 221 of the optical path adjusting film 220 of the present embodiment is the diameter ( D) can be formed larger than For example, the ratio of the height (H)/diameter (D) of the dome pattern 221 may be greater than 1 and smaller than or equal to 2, but is not limited thereto.

In addition, since the light path adjustment film 220 according to another embodiment of the present invention includes the cover layer 225, the adhesive strength with the polarizing plate or cover glass disposed thereon is improved through the flat upper surface of the cover layer 225. And through the lower surface of the cover layer 225 covering and fixing the plurality of dome patterns 221, deformation of the dome pattern 221 due to the polarizer and/or cover glass disposed thereon can be prevented. do.

At this time, if the diameter (D) of the dome pattern 221 is greater than the height (H), there is no image improvement effect, but as in another embodiment of the present invention, the height (H) of the dome pattern 221 ), and the optical path adjusting film 220 has a flat upper surface, thereby providing an image improvement effect.

Meanwhile, a plurality of dome patterns 221 included in the light path adjustment film 220 may be disposed in each subpixel 211 .

As shown in FIG. 22B, light is not output from the non-aperture area 211b of the sub-pixel 211, and the light output from the aperture area 211a is refracted while passing through the optical path adjustment film 220 and output. You can see the scope is expanding.

Here, an air layer having a refractive index smaller than the second refractive index may be present on the cover layer 225 of the optical path adjustment film 220.

That is, the light emitted outward from the opening area 211a of the subpixel 211 that is not visible to the human eye passes through the light path adjustment film 220, thereby forming a plurality of dome patterns 221 and a cover layer 225. ) and the refractive index of the air layer, the light is refracted in the vertical direction, and light is output not only in the open area 211a but also in the area corresponding to the non-opening area 211b.

Accordingly, the output range of the subpixel 211 can be expanded to an area corresponding to the non-opening area 211b.

Furthermore, the output range of the light output from the aperture area 211a may be further expanded by diffraction while passing through the optical path adjusting film 220 .

Therefore, when the light output from the subpixel 211 passes through the optical path adjusting film 220, the light is output to an area corresponding to the opening area 211a of the subpixel 211 and the subpixel 211 Since the area corresponding to the non-opening area 211b of the sub-pixel 211 is connected to the non-opening area 211b of the sub-pixel 211, it is possible to output visible light by adjusting the light path. It is possible to reduce the lattice feeling recognized as , and at the same time maintain a clear image.

As described above, the display device (100 in FIG. 4) according to another embodiment of the present invention includes a plurality of dome patterns 221 and a cover layer 225 on the display panel (110 in FIG. 2) and an optical path. By disposing the adjustment film 220, the light output from the open area 211a of each subpixel 211 can be expanded to the area corresponding to the non-opened area 211b.

Accordingly, it is possible to effectively improve the lattice feeling and image blur of VR (Virtual Reality) devices in which the screen and the eyes are close to each other to view images.

Hereinafter, a detailed description of the same or similar configuration as the above-described embodiment may be omitted.

23A is a view schematically illustrating a cross-section in which an optical path adjustment film and an optical adhesive film according to another embodiment of the present invention are disposed in a subpixel, and FIG. 23B is a view showing an optical path adjustment according to another embodiment of the present invention. It is a diagram schematically showing the path of light when the film and the optical adhesive film are disposed.

As shown in FIG. 23A, one subpixel 311 including an open area 311a and a non-opening area 311b, an optical adhesive film 330 on top of one subpixel 311, An optical path adjustment film 320 may be disposed on the optical adhesive film 330 .

Here, the optical path adjusting film 320 according to another embodiment of the present invention may include a base film 323 and a plurality of dome patterns 321 formed on the lower surface of the base film 323 . That is, the light path adjustment film 320 may include a flat base film 323 and a plurality of intaglio dome patterns 321 disposed on the lower surface of the base film 323 adjacent to the display panel (110 in FIG. 17 ). .

In addition, an optical adhesive film 330 may be disposed to cover the plurality of dome patterns 321 formed on the lower surface of the optical path adjusting film 320 . That is, the upper surface of the optical adhesive film 330 in contact with the optical path adjustment film 320 covers the plurality of intaglio dome patterns 321 of the optical path adjustment film 320, and the lower surface opposite to the upper surface is flat. can be formed

Here, the optical adhesive film 330 may have a refractive index higher than that of the optical path adjusting film 320 .

In addition, the light path adjusting film 320 may be made of resin. For example, it may be made of polyethylene terephthalate (PET), polycarbonate (PC), or acrylic (ACRYL)-based materials, but is not limited thereto.

Also, the optically clear adhesive 330 may be made of resin, but is not limited thereto.

In addition, in order to prevent the light output from the subpixels 311 from being output to empty spaces between the plurality of intaglio dome patterns 321 and being viewed as chromatic dispersion, the optical path adjustment film 320 includes The diameter (D) of each intaglio dome pattern 321 may be larger than the separation distance (d) between the dome patterns 321 . For example, the diameter (D) of each dome pattern 321 may be 1 μm to 20 μm or less, and the separation distance (d) between the dome patterns 321 may be 5 μm or less, but is not limited thereto. not.

Another embodiment of the present invention covers the intaglio dome pattern 321 formed on the optical path adjustment film 320, and an optical adhesive film 330 having a higher refractive index than the optical path adjustment film 320 is disposed. Therefore, in order to adjust the path of light in the same way as in the above-described embodiment, the height H of the dome pattern 321 should be formed higher than in the above-described embodiment.

Therefore, the height (H) of the intaglio dome pattern 321 of the optical path adjustment film 320 of this embodiment is It may be formed larger than the diameter (D). For example, the ratio of the height (H)/diameter (D) of the dome pattern 321 may be greater than 1 and smaller than or equal to 2, but is not limited thereto.

In addition, the light path adjusting film 320 according to another embodiment of the present invention can improve adhesion to a polarizing plate or cover glass disposed thereon through a flat upper surface, and has an intaglio on the lower part of the light path adjusting film 320. An optical adhesive film 330 covering and fixing the plurality of dome patterns 321 of the number is disposed to prevent deformation of the plurality of dome patterns 321 of the intaglio.

At this time, if the diameter (D) of the dome pattern 321 is greater than the height (H), there is no image improvement effect, but as in another embodiment of the present invention, the height (H) of the dome pattern 321 ), and the optical path adjusting film 320 may provide an image improvement effect while having a flat upper surface.

Meanwhile, a plurality of intaglio dome patterns 321 included in the light path adjustment film 320 may be disposed in each subpixel 311 .

As shown in FIG. 23B, the non-opening area 311b of the sub-pixel 311 does not output light, and the light output from the opening area 311a is applied to the optical adhesive film 330 and the optical path adjusting film ( 320), it is refracted and the output range is expanded.

An air layer having a refractive index smaller than the refractive index of the optical path adjusting film 320 may be disposed above the optical path adjusting film 320 .

That is, the optical adhesive film 330 and the optical path adjustment film 320 are passed through the optical adhesive film 330 and the optical path adjustment film 320, so that the light output from the opening area 311a of the subpixel 311 to the outside that is not visible to the human eye passes through. Due to a difference in refractive index between the optical path adjusting film 330 and the air layer, light is refracted in a vertical direction, and light is output not only in the open area 311a but also in the area corresponding to the non-opening area 311b.

Accordingly, the output range of the subpixel 311 can be expanded to an area corresponding to the non-opening area 311b.

Furthermore, the output range of the light output from the opening area 311a may be further expanded by diffraction while passing through the optical adhesive film 330 and the optical path adjustment film 320 .

Therefore, when the light output from the sub-pixel 311 passes through the optical adhesive film 330 and the optical path adjustment film 320, the light is directed to an area corresponding to the opening area 311a of the sub-pixel 311. At the same time as the output, it is possible to output visible light by adjusting the path of light to the area corresponding to the non-opening area 311b of the sub-pixel 311, so that the non-opening area 311b of the sub-pixel 311 Corresponding areas are connected to reduce the lattice feeling perceived as a lattice form and at the same time maintain a clear image.

As described above, the display device (100 in FIG. 19) according to another embodiment of the present invention includes an optical path adjusting film (including a plurality of intaglio dome patterns 321) on the display panel (110 in FIG. 17). 320), an optical adhesive film 330 disposed between the display panel (110 in FIG. 17) and the optical path adjustment film 320 to cover the intaglio dome pattern 321 of the optical path adjustment film 320. Thus, the light output from the opening area 311a of each subpixel 311 can be expanded to the area corresponding to the non-opening area 311b.

Accordingly, it is possible to effectively improve the lattice feeling and image blur of VR (Virtual Reality) devices in which the screen and the eyes are close to each other to view images.

24 is a diagram schematically showing a state in which subpixels are enlarged to an area corresponding to a non-aperture area according to an embodiment of the present invention.

As shown in FIG. 24, the sub-pixel 311 is divided into an open area 311a through which light is output and a non-opened area 311b through which light is not output, and the light output from the open area 311a is viewed. It can be seen that the optical film LF of the present invention expands to an area corresponding to the non-aperture area 311b by refraction and diffraction.

Here, the optical film LF is the aforementioned optical path adjusting film (120 in FIG. 21, 220 in FIG. 22B), or the aforementioned optical adhesive film (330 in FIG. 23B) and the optical path adjusting film (320 in FIG. 23B). means

Accordingly, in the display device (100 in FIG. 19) of the present invention, the area corresponding to the non-opening area 311b of the sub-pixel 311 is connected to reduce the lattice feeling perceived as a lattice form and at the same time maintain a clear image. there will be

FIG. 25A is a picture showing the lattice feeling according to the non-opening area of the subpixel, and FIG. 25B is a picture with improved lattice feeling according to the embodiment of FIG. 4 of the present invention.

As shown in FIG. 25A, a display device without an optical path adjustment film is recognized in the form of a lattice in which non-opening areas (A2 in FIG. 1) are connected into one, in which light is not output, whereas FIG. As shown in FIG. 25B, the display device (100 in FIG. 4) according to the embodiment of 4 maintains a clear image and effectively improves the lattice feeling.

26A to 26C are views schematically showing modified examples of the dome pattern of the embodiment of the present invention.

As shown, each of the plurality of dome patterns 121, 221, and 321 of the embodiment of the present invention may be spaced apart from each other.

Here, a valley V may be formed in a space between the plurality of dome patterns 121, 221, and 321 spaced apart. That is, the space between the dome patterns 121, 221, and 321 is not flat, and the valley V may be formed in the space between the dome patterns 121, 221, and 321, respectively.

However, in the case of the above-described embodiment in which the dome patterns 121, 221, and 321 are formed in a negative shape, a valley V is formed in the optical adhesive film 330, and the optical path adjusting film 320 is formed in the optical adhesive film 330. ) It may be in the form of filling the valley (V) formed in.

In this way, when the valley V is formed in the space between the dome patterns 121, 221, and 321, the pattern fill factor can be increased, and the non-opening area (311b in FIG. 24) Extendability of light to a corresponding area can be further increased. We will look at this in more detail later.

27 is a photograph showing a change in lattice feeling according to the height of a dome pattern according to an embodiment of the present invention.

Here, the diameter (D in FIG. 17) of the dome pattern (121 in FIG. 17) of the light path adjustment film (120 in FIG. 17) is 4 μm, and the pitch of the dome pattern (121 in FIG. 17) is fixed at 5 μm, The change in grid feeling according to the change in height (H in FIG. 17) is shown.

As shown, when the ratio of height (H) / diameter (D) is 0.1 to 0.5, it can be seen that the image of the display device (100 in FIG. 19) maintains a clear image and no grid feeling is viewed.

That is, when the diameter (D) of the dome pattern (121 in FIG. 17) is 4 μm and the height (H) of the dome pattern (121 in FIG. 17) is 0.4 μm to 2 μm, a clear image is maintained and grid monitoring is recognized. You can see what doesn't happen.

The light path adjusting film (220 in FIG. 22B) of the embodiment of the present invention is formed on a base film (223 in FIG. 22B), a plurality of dome patterns (221 in FIG. 22B), and a plurality of dome patterns (221 in FIG. 22B). Since the cover layer 225 having a lower refractive index than the base film (223 in FIG. 22B) and the plurality of dome patterns (221 in FIG. 22B) is disposed, in order to adjust the path of light in the same way as in the above-described embodiment, the above-described implementation is performed. Since the height (H in FIG. 7a) of the dome pattern (221 in FIG. 7b) is formed higher than the example, when the ratio of height (H) / diameter (D) is 0.5 to 2, the image of the display device maintains a clear image, The lattice feeling is not recognized.

In addition, the embodiment of the present invention covers the intaglio dome pattern (321 in FIG. 23B) of the optical path adjusting film (320 in FIG. 23B) and has an optical adhesive having a higher refractive index than the optical path adjusting film (320 in FIG. 23B). Since the film (330 in FIG. 23B) is disposed, the height (H in FIG. 23A) of the dome pattern (321 in FIG. 8B) is formed higher than in the above-described embodiment in order to adjust the path of light in the same way as in the above-described embodiment. , When the ratio of height (H) / diameter (D) is 0.5 to 2, the image of the display device maintains a clear image and the grid feeling is not viewed.

FIG. 28A is a diagram referenced to explain a pattern fill factor, and FIG. 28B is a photograph showing a change in lattice feeling according to a change in the pattern fill factor.

As shown in FIG. 28A, the light path adjusting film of the first, second, and third embodiments (120 in FIG. 17, FIG. The dome pattern DP formed at 220 of 22b and 320 of FIG. 23b) is disposed.

Here, the pattern filling ratio (?) ( Fill Factor) (DP/FA×100).

Accordingly, the pattern fill factor may be changed according to the diameter D of the dome pattern DP and the pitch P of the dome pattern DP.

28B shows a change in lattice feeling according to a change in the pitch of the dome pattern DP based on a case where the diameter D of the dome pattern DP is 4 μm and the ratio of the height H/diameter D is 0.1. represents

That is, since the diameter D of the dome pattern DP is fixed, the pattern fill factor may change according to the change in the pitch P of the dome pattern DP.

As shown, when the pitch P of the dome pattern DP is 4 μm, the pattern fill factor is 80?, and the image of the display device (100 in FIG. This is not being acknowledged.

In addition, when the pitch (P) of the dome pattern DP is 6 μm, the pattern fill factor is 35?, and the image of the display device (100 in FIG. 19) remains clear and the grid feeling is not recognized. is not

However, as shown, when the pitch P of the dome pattern DP is 8 μm, the pattern fill factor is 20?, and the grid feeling is recognized in the image of the display device (100 in FIG. 19). Able to know.

That is, the pattern fill factor is 35? to 80?, the lattice feeling is not recognized and a clear image can be maintained at the same time.

On the other hand, as the pattern fill factor increases, the extendability of the light output from the subpixel (311 in FIG. 9) increases, but the optical path adjusting film (120 in FIG. 17, 220 in FIG. When the dome pattern DP is formed on the 320 of FIG. 23B, the problem of deterioration in releasability of the stamper and the optical path adjusting film (120 of FIG. 17, 220 of FIG. 22B, 320 of FIG. 23B) occurs, and the pattern 80 fill factor? It is difficult to raise above.

However, referring to FIGS. 26A to 26C, which are modified examples of the present invention, the spaces between the dome patterns (121 in FIG. 26A, 221 in FIG. 26B, and 321 in FIG. 26C) are not flat, and the dome pattern (121 in FIG. 26A) is not flat. , 221 in FIG. 26b, 321 in FIG. 26c) in a structure in which valleys (V in FIGS. 26a, 26b, and 26c) are formed in the spaces spaced apart from each other, a stamper and an optical path adjusting film (120 in FIG. 17, 220 in FIG. 22B and 320 in FIG. 23B), there is no problem of deterioration in releasability, so there is an advantage in that the pattern fill factor can be increased to 100?. Accordingly, the extendability of light output from the subpixel 311 can be further increased.

29a and 29b are photographs showing the chromatic dispersion according to the diameter of the dome pattern according to the embodiment of the present invention.

As shown in FIG. 29A, it is shown that the light output from the subpixel (311 in FIG. 24) is output as it is to the empty space between the dome patterns (DP in FIG. 28A) and is viewed like chromatic dispersion.

Therefore, in order to minimize chromatic dispersion due to empty spaces between dome patterns (DP in FIG. 28A), it is preferable to form the diameter (D in FIG. 28A) of 20 μm or less of the dome pattern (DP in FIG. 28A).

When the dome pattern (DP in FIG. 28A) has a diameter (D in FIG. 28A) of 20 μm or less, it can be seen that chromatic dispersion is not observed as shown in FIG. 29B.

In this way, forming the dome pattern (DP in FIG. 28A) to have a diameter (D in FIG. 28A) of 20 μm or less may vary according to the size of the subpixel (311 in FIG. 24), but is not limited thereto.

30 schematically illustrates an example of a display device according to an embodiment of the present invention, and is an example including an organic light emitting diode panel.

As shown in FIG. 30, the organic light-emitting diode panel 410 disposed on the heat-dissipating film 450 and the heat-dissipating film 450, and the above-described optical path adjusting film (see FIG. 6) on the organic light-emitting diode panel 410. An optical film LF defined by 120, 220 in FIG. 7B, and 330 and 320 in FIG. 8B) is disposed, and an upper portion of the optical film LF is used to protect the polarizer 430 and the organic light emitting diode panel 410. A cover glass 440 may be disposed.

The heat dissipation film 450 is to prevent a rapid decrease in lifespan due to heat generated during driving of the organic light emitting diode panel 410 and deterioration of the driving thin film transistor Td, and to improve the surface area in contact with the outside air. It may be made of a concave-convex pattern.

In addition, the organic light emitting diode panel 410 includes a first substrate 411 in which a plurality of subpixel areas Pr, Pg, and Pb are defined, and light emitting diodes E formed in each subpixel area Pr, Pg, and Pb. and an encapsulation layer 418 covering the light emitting diode E.

Driving thin film transistors (Td) are formed in the sub-pixel regions (Pr, Pg, Pb) on the inner surface of the first substrate 411, and a first protective layer 414 is formed on the driving thin film transistor (TFT) (Td). ) can be formed.

The driving thin film transistor Td may include a semiconductor layer, a gate electrode, a source electrode, and a drain electrode, and an interlayer insulating layer may be formed on the gate electrode, and a data line 413 may be formed on the interlayer insulating layer.

A first electrode 415a connected to the driving thin film transistor Td is formed in each of the sub-pixel regions Pr, Pg, and Pb above the first passivation layer 414, and each sub-pixel region above the first electrode 415a is formed. A light emitting layer 415b including a light emitting pattern emitting red (R), green (G), and blue (B) is formed in the pixel regions Pr, Pg, and Pb, and a second light emitting layer 415b is formed on the entire upper surface of the light emitting layer 415b. An electrode 415c may be formed.

In addition, a bank layer 416 is formed on the first electrode 415a, and the bank layer 416 emits light emitting patterns of red (R), green (G), and blue (B) to each sub-pixel area. (Pr, Pg, Pb) can play a role of classifying.

Here, the first electrode 415a, the light emitting layer 415b, and the second electrode 415c may configure the light emitting diode E.

Also, a second passivation layer 417 may be formed on the second electrode 415c, and an encapsulation layer 418 may be formed on the second passivation layer 417.

The encapsulation layer 418 may be formed by arranging an organic layer and an inorganic layer in multiple layers on the second protective layer 417, and may be formed through a face seal on the second protective layer 417. may be

Here, the first substrate 411, which is also referred to as a lower substrate, a TFT substrate, or a backplane, may be made of a material such as glass or plastic.

The second protective layer 417 formed on the light emitting diode E serves to prevent penetration of moisture or foreign substances from the outside, and the encapsulation layer 418 formed on the second protective layer 417 may serve to prevent penetration of moisture or foreign matter from the outside and at the same time absorb external shock.

In describing the present invention, the organic light emitting diode panel structure described above is an example, but is not limited thereto.

Here, by attaching the aforementioned optical film (LF) on the organic light emitting diode panel 410, the path of light realized from the organic light emitting diode panel 410 is extended to an area corresponding to the non-opening area (311b in FIG. 9). It is possible to reduce the lattice feeling while maintaining a clear image.

In addition, the reliability of the organic light emitting diode panel 410 may be further increased by protecting the upper portion of the encapsulated organic light emitting diode panel 410 with the optical film LF.

In addition, the polarizer 430 causes mutual interference between light emitted from the self-emitting body of the organic light emitting diode panel 410 and external natural light (external light) reflected from the outside and reflected by the internal reflector, thereby reducing the performance of the display device 400. In order to prevent this degradation, the absorption axis of the polarizer and the optical axis (absorption axis) of the retardation compensation film are oriented so as to be inclined to rotate the waveform of the external light reflected by the internal reflector, thereby functioning as an antireflection filter.

Meanwhile, in describing the present invention, it has been described that the optical film LF is disposed between the organic light emitting diode panel 410 and the polarizing plate 430, but this is an example of the present invention, and the present invention is not limited thereto. not. Accordingly, the optical film LF may be disposed on the polarizer 430 .

In addition, when the display device 400 of the present invention is applied to a Virtual Reality (VR) device, the cover glass 440 and the polarizer 430 may be omitted due to the structure of the VR (Virtual Reality) device.

31 is a diagram schematically illustrating an example of a display device according to an embodiment of the present invention, and is an example including a liquid crystal panel.

As shown in FIG. 31, the liquid crystal display device 500 includes a liquid crystal panel 510 and an optical path adjustment film (120 in FIG. 6, 220 in FIG. 7b, and 330 in FIG. 8b) on the upper portion of the liquid crystal panel 510. and 320), the optical film LF defined by may be disposed.

The liquid crystal panel 510 faces each other and has a first substrate 511 and a second substrate 512 positioned thereon, and may include a liquid crystal layer 579 between the two substrates 511 and 512 .

A plurality of gate wires (not shown) are formed on the first substrate 511 extending in one direction and spaced at regular intervals, and a common wire (not shown) is formed in parallel and spaced apart from each gate wire (not shown). It can be.

In addition, the gate electrode 513, the gate insulating film 514, and the semiconductor layer 515 sequentially stacked in the switching region TrA where the switching element is formed and the source and drain electrodes 516 and 517 spaced apart from each other are switching elements. A thin film transistor (Tr) may be configured.

In addition, a data line 580 defining the pixel region Pa is formed over the gate insulating film 514 by crossing a gate line (not shown), and at this time, the source electrode 516 may be connected to the data line 580. have.

Next, a drain contact hole 519a corresponding to the drain electrode 517 of the thin film transistor Tr and the common wiring (not shown) exposed over the thin film transistor Tr and the data wiring 580 and the common wiring A first protective layer 518 having a contact hole (not shown) made of an inorganic insulating material and a second protective layer 519 made of an organic insulating material and having a flat surface may be disposed.

In addition, the second passivation layer 519 is made of a transparent conductive material, for example, indium-tin-oxide (ITO) or indium-zinc-oxide (IZO), and the common wire contact hole ( A plurality of common electrodes 571 having a bar shape connected to the common wire (not shown) through a common wire (not shown) and contacting the drain electrode 517 through the drain contact hole 519a and contacting the plurality of common electrodes 571 A plurality of pixel electrodes 570 spaced apart from the common electrode 571 and alternately having a bar shape may be disposed.

Meanwhile, in the second substrate 512 corresponding to the first substrate 511, on the inner surface facing the first substrate 511, a black matrix ( 572) is provided, and red, green, and blue color filter patterns (R, G) are overlapped with the black matrix 572 and sequentially correspond to each sub-pixel region in the area surrounded by the black matrix 572. , B) may be formed.

An overcoat layer 578 having a flat surface may be disposed to protect the color filter layer 573 .

In addition, a first polarizing plate 581 and a second polarizing plate 582 are disposed on outer surfaces of the first substrate 511 and the second substrate 512, respectively, and the first polarizing plate 581 and the second polarizing plate 582 transmits light of a polarization component coincident with the transmission axis, and the degree of transmission of light is determined by the arrangement of transmission axes of the first polarizer 581 and the second polarizer 582 and the arrangement of liquid crystals.

Here, transmission axes of the first polarizer 581 and the second polarizer 582 may be vertically disposed.

In addition, the above-described optical film LF is attached to the top of the upper polarizing plate 582 disposed on the outer surface of the color filter substrate 512, or the upper polarizing plate 582 disposed on the outer surface of the color filter substrate 512 and the color By attaching the above-described optical film (LF) between the filter substrates 512, the path of light implemented from the liquid crystal panel 510 is extended to the area corresponding to the non-opening area (311b in FIG. 9), maintaining a clear image and grating. A display device 500 with a reduced sense may be implemented.

In describing the present invention, the liquid crystal panel structure is an example, but is not limited thereto.

In addition, in describing the present invention, the pentile structure has been described as an example, but this is an example of the present invention, and the present invention is not limited thereto.

Although the embodiments of the present invention have been described in more detail with reference to the accompanying drawings, the present invention is not necessarily limited to these embodiments, and may be variously modified and implemented without departing from the technical spirit of the present invention. . Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The protection scope of the present invention should be construed according to the scope of the claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

100, 600: first display panel 200, 700: second display panel
300, 800: third display panel 110, 610: first backlight unit
210, 710: second backlight unit 310, 810: third backlight unit
410, 510: first reflection mirror 420: 520: second reflection mirror
430, 530: third reflection mirror 440: fourth reflection mirror

Claims (21)

display panel; and
It is made by including an optical path adjustment film provided on the display panel,
The light path adjusting film is provided in a base layer, a plurality of dome patterns formed in a convex pattern on the base layer, and a space between the plurality of dome patterns and extends from the upper surface of the base layer to the inside of the base layer. A valley pattern of, and a cover layer provided on the plurality of dome patterns and the plurality of valley patterns,
The base layer and the plurality of dome patterns are made of the same material,
A refractive index of the plurality of dome patterns is different from a refractive index of the cover layer display device. delete delete According to claim 1,
The cover layer includes a first cover layer provided on the plurality of dome patterns and a second cover layer provided on the first cover layer,
The refractive index of the plurality of dome patterns is lower than the refractive index of the first cover layer and the refractive index of the second cover layer is lower than the refractive index of the first cover layer, or the refractive index of the plurality of dome patterns is lower than the refractive index of the first cover layer The refractive index of the second cover layer is higher than the refractive index of the display device is higher than the refractive index of the first cover layer. According to claim 1,
Surfaces of the plurality of dome patterns include a flat surface provided in a central region and a curved surface provided in an edge region. According to claim 1,
A difference in refractive index between the plurality of dome patterns and the cover layer is in the range of 0.05 to 0.4. According to claim 1,
The ratio of the height to the diameter of each of the plurality of dome patterns is in the range of 0.05 to 2. According to claim 1,
A display device in which a diameter of each of the plurality of dome patterns ranges from 1 μm to 20 μm. According to claim 1,
The optical path adjusting film is fixed on the display panel by an adhesive layer. According to claim 1,
The optical path adjusting film is directly fixed on the display panel without an adhesive layer. According to claim 1,
The plurality of dome patterns are configured to have different diameters from each other. According to claim 1,
The plurality of dome patterns are arranged at different pitches from each other. According to claim 1,
Further comprising a polarizing film provided on the display panel and a cover film provided on the polarizing film,
The display device of claim 1 , wherein the optical path adjustment film is disposed at any one of positions between the display panel and the polarizing film, between the polarizing film and the cover film, and an upper surface of the cover film. a display panel including a pixel having a plurality of subpixels;
an optical path control film having a first refractive index positioned above the display panel;
An optical adhesive film disposed between the display panel and the optical path adjusting film,
The optical path adjustment film includes a base film, a plurality of dome patterns disposed on an upper surface of the base film, and a cover layer provided on the plurality of dome patterns,
The cover layer includes a first cover layer provided on the plurality of dome patterns and a second cover layer provided on the first cover layer,
The upper surface of the first cover layer has a dome pattern structure corresponding to the upper surfaces of the plurality of dome patterns, and the upper surface of the second cover layer has a structure that does not correspond to the upper surfaces of the plurality of dome patterns. Display device. 15. The method of claim 14,
The cover layer has a second refractive index smaller than the first refractive index. delete delete The method of claim 14 or 15,
Each of the plurality of dome patterns has a diameter (D) in the range of 1 μm to 20 μm, and the distance between the dome patterns is 5 μm or less. According to claim 18
A display device having a ratio of height (H) / diameter (D) of the dome pattern of 0.05 to 2. According to claim 19,
A display device in which a valley is formed in a space between the plurality of dome patterns spaced apart. According to claim 15,
A display device in which the height (H) of the dome pattern is greater than the diameter (D).

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