CN118265391A

CN118265391A - Display device

Info

Publication number: CN118265391A
Application number: CN202311826804.2A
Authority: CN
Inventors: 成世宗; 金炅旼; 朴惠敏; 朴世鸿; 金垣来; 崔仁爱; 南瑞现
Original assignee: LG Display Co Ltd
Current assignee: LG Display Co Ltd
Priority date: 2022-12-27
Filing date: 2023-12-27
Publication date: 2024-06-28

Abstract

Provided is a display device which can improve the light extraction efficiency of light emitted from a light emitting element layer. The display device includes: a substrate having a plurality of pixels, each of the plurality of pixels having a plurality of sub-pixels; a pattern portion disposed on the substrate; a reflection part on the pattern part; and a plurality of lines for driving the plurality of sub-pixels, wherein the plurality of sub-pixels include a light emitting region and a non-light emitting region adjacent to the light emitting region, the pattern portion is disposed to surround the light emitting region, and at least a portion of the reflection portion is disposed to surround the light emitting region.

Description

Display device

The present application claims the benefit of korean patent application No. 10-2022-0185346, filed on day 27, 12 of 2022, which is incorporated by reference as if fully set forth herein.

Technical Field

The present disclosure relates to a display device for displaying an image.

Background

Since the organic light emitting display device has a high response speed and low power consumption, and is self-luminous unlike a liquid crystal display device without a separate light source, there is no problem in view angle, and thus the organic light emitting display device has been attracting attention as a next-generation flat panel display device.

Such a display device displays an image by light emission of a light emitting element layer including a light emitting layer interposed between two electrodes.

Meanwhile, some light emitted from the light emitting element layer is not emitted to the outside due to total reflection at an interface between the light emitting element layer and the electrode and/or between the substrate and the air layer, and thus light extraction efficiency of the display device is reduced.

Disclosure of Invention

The present disclosure has been made in view of the above problems, and an object of the present disclosure is to provide a display device that can improve light extraction efficiency of light emitted from a light emitting element layer.

It is another object of the present disclosure to provide a display device in which a luminance maintenance ratio (luminance retention rate) and a light extraction efficiency can be further improved by extracting light from a non-light-emitting region.

It is yet another object of the present disclosure to provide a display device in which light can be extracted from a non-light emitting region adjacent to a corner (corner portion) of a light emitting region.

It is still another object of the present disclosure to provide a display device in which light extraction efficiency can be maximized by a reflection line disposed in a non-light emitting region.

It is still another object of the present disclosure to provide a display device that can prevent color mixing (color mixture) between sub-pixels from occurring.

It is yet another object of the present disclosure to provide a display device that can maintain the color and color viewing angle of a subpixel.

It is a further object of the present disclosure to provide a display device that can improve the color temperature (color temperature) of a white subpixel.

It is a further object of the present disclosure to provide a display device that can improve the lifetime.

In addition to these objects of the present disclosure as described above, other objects and features of the present disclosure will be clearly understood by those skilled in the art from the following description of the present disclosure.

In accordance with one aspect of the present disclosure, the above and other objects can be accomplished by the provision of a display device comprising: a substrate having a plurality of pixels, each of the plurality of pixels having a plurality of sub-pixels; a pattern portion disposed on the substrate; a reflection part on the pattern part; and a plurality of lines for driving the plurality of sub-pixels, wherein the plurality of sub-pixels include a light emitting region and a non-light emitting region adjacent to the light emitting region, the pattern portion is disposed to surround the light emitting region, and at least a portion of the reflection portion is disposed to surround the light emitting region.

In accordance with another aspect of the present disclosure, the above and other objects can be accomplished by the provision of a display device comprising: a substrate including a plurality of sub-pixels having a light emitting region and a non-light emitting region adjacent to the light emitting region; a pattern part formed to be concave on the substrate and surrounding the light emitting region; a reflection portion on the pattern portion; and a plurality of lines for driving the plurality of sub-pixels, wherein the non-light emitting region includes a first region adjacent to the light emitting region and a second region adjacent to the first region, and the first region is between the second region and the light emitting region, and at least one line of the plurality of lines is disposed in the first region and is a reflection line.

Drawings

The above and other objects, features and other advantages of the present disclosure will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

fig. 1 is a schematic plan view illustrating a display device according to an embodiment of the present disclosure;

Fig. 2 is a schematic plan view showing one pixel shown in fig. 1;

FIG. 3 is a schematic cross-sectional view taken along line I-I' shown in FIG. 2;

fig. 4 is an enlarged view showing a portion a shown in fig. 3;

fig. 5 is an image illustrating light extraction characteristics of a non-light emitting region of a display device according to one embodiment of the present disclosure;

fig. 6 is an enlarged view showing the a part shown in fig. 3, showing a color filter provided in a non-light emitting region;

FIG. 7 is a schematic cross-sectional view taken along line II-II' shown in FIG. 2;

FIG. 8 is a schematic cross-sectional view taken along line III-III' shown in FIG. 2;

FIG. 9 is a schematic cross-sectional view taken along line IV-IV' shown in FIG. 2;

FIG. 10 is a schematic cross-sectional view taken along line V-V' shown in FIG. 2;

Fig. 11 is a schematic plan view showing a plurality of pixels of a display device according to an embodiment of the present disclosure;

FIG. 12 is a schematic cross-sectional view taken along line VI-VI' as shown in FIG. 11;

fig. 13 is a schematic plan view illustrating a display device according to another embodiment of the present disclosure;

FIG. 14 is a schematic cross-sectional view taken along line VII-VII' shown in FIG. 13;

fig. 15A is an image showing light extraction characteristics of a red subpixel of the display device according to the comparative example;

fig. 15B is an image showing light extraction characteristics of a red subpixel of a display device according to another embodiment of the present disclosure;

FIG. 16 is a schematic cross-sectional view taken along line VIII-VIII' shown in FIG. 13;

Fig. 17A is an image showing light extraction characteristics of a white subpixel of the display device according to the comparative example;

fig. 17B is an image showing light extraction characteristics of a white subpixel of a display device according to another embodiment of the present disclosure;

fig. 18 is a schematic cross-sectional view illustrating another example of fig. 14;

fig. 19A is an image showing light extraction characteristics of another white sub-pixel of the display device according to the comparative example;

Fig. 19B is an image illustrating light extraction characteristics of another white subpixel of a display device according to another embodiment of the present disclosure.

Detailed Description

Reference will now be made in detail to embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings.

Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.

Advantages and features of the present disclosure, and methods of implementing the same, will be elucidated by the following embodiments described with reference to the accompanying drawings.

This disclosure may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Furthermore, the present disclosure is limited only by the scope of the claims.

The shapes, sizes, proportions, angles, and numbers disclosed in the drawings for the purpose of describing embodiments of the present disclosure are merely examples, and thus the present disclosure is not limited to the details shown.

Like numbers refer to like elements throughout. In the following description, a detailed description of related known functions or constructions will be omitted when it is determined that the emphasis of the present disclosure may be unnecessarily obscured.

Where the description is made in this document using "including", "having" and "including", other parts may be added unless "only" is used. Unless otherwise indicated, singular terms may include the plural.

In interpreting an element, although not explicitly described, the element should be interpreted as including an error range.

In describing the positional relationship, for example, when the positional relationship between the two parts is described as "on … …", "over … …", "under … …", "after … …", "next", one or more other parts may be provided between the two parts unless "just" or "direct" is used.

In describing the time relationship, for example, when the time sequence is described as "after … …", "subsequent", "next", and "before … …", a discontinuous case may be included unless "just" or "direct" is used.

It will be understood that, although the terms "first," "second," etc. may be used herein to describe various elements, these elements should not be limited by these terms.

These terms are only used to distinguish one element from another element. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present disclosure.

The "X-axis direction", "Y-axis direction" and "Z-axis direction" should not be construed as merely geometric relationships in a mutually perpendicular relationship, but rather may have a broader directionality insofar as the elements of the present disclosure may function functionally.

The term "at least one" should be understood to encompass any and all combinations of one or more of the associated listed items. For example, the meaning of "at least one of the first, second, and third items" means a combination of all items selected from two or more of the first, second, and third items, and the first, second, or third item.

Those skilled in the art will fully appreciate that the features of the various embodiments of the disclosure may be combined or combined with each other, either in part or in whole, and that various interoperations and drives may be technically possible with each other.

Embodiments of the present disclosure may be implemented independently of each other or together in interdependent relationship.

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

Fig. 1 is a schematic plan view illustrating a display device according to an embodiment of the present disclosure, fig. 2 is a schematic plan view illustrating one pixel illustrated in fig. 1, fig. 3 is a schematic sectional view taken along the I-I' line illustrated in fig. 2, fig. 4 is an enlarged view illustrating the a portion illustrated in fig. 3, and fig. 5 is an image illustrating light extraction characteristics of a non-light emitting region of the display device according to an embodiment of the present disclosure.

Referring to fig. 1 to 5, a display device 100 according to an embodiment of the present disclosure includes: a substrate 110 having a plurality of pixels P, each of the plurality of pixels P having a plurality of sub-pixels SP; a pattern portion 120 disposed on the substrate 110 and formed to be concave between the plurality of sub-pixels SP; a reflection part 130 on the pattern part 120; and a plurality of lines 150 for driving the plurality of sub-pixels SP. The plurality of subpixels SP may include a light emitting area EA and a non-light emitting area NEA adjacent to the light emitting area EA. The pattern portion 120 may be disposed to surround the light emitting area EA. The plurality of lines 150 may be disposed in the non-light emitting region NEA. In this case, at least one line of the plurality of lines 150 may at least partially overlap the pattern portion 120. For example, as shown in fig. 3, the first data line DL1 may partially overlap the inclined surface 120s and the bottom surface 120b of the pattern portion 120.

The line 150 overlapping the pattern portion 120 may be a reflection line. A reflective line according to one example may refer to a line made of a material capable of reflecting light emitted from the light emitting area EA, but the present disclosure is not limited thereto. The reflection line may refer to a line made of a material capable of reflecting light emitted from the light emitting area EA and reflected by the reflection part 130. A reflection line according to another example may include an upper surface in a direction facing the reflection part 130, and may refer to a line in which the upper surface of the reflection line is made of a reflective material. Meanwhile, the reflection line may refer to a line capable of having a reflectivity of 90% or more in a visible light (visible) region. For example, the reflective wire may be a wire comprising silver (Ag) and/or aluminum (Al). The visible light region may refer to a region having a wavelength of 380nm to 780 nm.

Accordingly, in the display device 100 according to one embodiment of the present disclosure, as shown in fig. 4, light emitted from the light emitting area EA and directed to the line 150 may be reflected by the line 150 first and may be reflected by the reflection part 130 a second time. The light reflected by the reflection part 130 for the second time may be reflected by the reflection electrode 117 of the light emitting element layer E included in the plurality of sub-pixels SP for the third time and then may be emitted to the light emitting area EA or the non-light emitting area NEA of the sub-pixels SP.

Accordingly, the display device 100 according to one embodiment of the present disclosure may extract light even through the lines disposed in the non-light emitting region NEA, and thus may improve overall light extraction efficiency.

The light emitting area EA is an area emitting light, and may be included in the display area DA. The non-display area NDA may be disposed at the periphery of the display area DA. The non-light emitting region NEA is a region where light is not emitted, and may be included in the display region DA. The non-light emitting region NEA may be expressed as a term "peripheral region". The non-light emitting region NEA may include a first region A1 adjacent to the light emitting region EA and a second region A2 adjacent to the first region A1, and the second region A2 may be separated from the light emitting region EA by the first region A1, i.e., the first region A1 may be between the second region A2 and the light emitting region EA. As shown in fig. 3, the plurality of lines 150 may be disposed in the non-light emitting region NEA, for example, may be disposed in the first region A1 and/or the second region A2. The second area A2 according to one example may refer to a predetermined area overlapping with a boundary (boundary) portion between the plurality of sub-pixels SP. For example, as shown in fig. 3, the second area A2 may refer to an area overlapping with a boundary portion (or boundary line) of the plurality of sub-pixels SP while having a wider width than the boundary portion (or boundary line). In the display device 100 according to one embodiment of the present disclosure, the line disposed in the first region A1 is set as a reflection line, whereby light extraction efficiency may be improved.

As shown in fig. 4, the first area A1 may be an area in which a bank (bank) 115 of each of the plurality of sub-pixels SP is disposed. The second area A2 may be an area between the banks 115 included in each of the plurality of sub-pixels SP. For example, the first region A1 of the second subpixel SP2 may be a region between the light emitting region EA of the second subpixel SP2 and the second region A2 between the first subpixel SP1 and the second subpixel SP 2. The second region A2 may be a bank (bankless) free region between the first subpixel SP1 and the second subpixel SP 2.

The display device 100 according to one embodiment of the present disclosure is provided with the reflection part 130 on the pattern part 120 between the plurality of sub-pixels SP such that light directed to the adjacent sub-pixel SP among the light emitted from the light emitting area EA may be reflected to the light emitting area EA of the sub-pixel SP for light emission and/or the non-light emitting area NEA of the sub-pixel SP for light emission. Accordingly, the display device 100 according to one embodiment of the present disclosure may improve light extraction efficiency of the sub-pixel SP for emitting light.

Since the pattern part 120 according to one example is set to surround the light emitting area EA of each of the plurality of sub-pixels SP, the reflection part 130 may also be set to surround the light emitting area EA of each of the plurality of sub-pixels SP. The light reflected by the reflection part 130 may be emitted to the outside through the lower surface of the substrate 110 in the light emitting area EA of the sub-pixel SP for emitting light and/or the non-light emitting area NEA spaced apart from the light emitting area EA of the sub-pixel SP for emitting light.

The pattern portion 120 according to one example may be formed to be concave in the vicinity of the non-light emitting region NEA. For example, the pattern portion 120 may be formed to be concave in the cover layer 113 (shown in fig. 3) on the substrate 110. As shown in fig. 2, the pattern portion 120 may be provided to surround the light emitting area EA. The pattern portion 120 may be disposed to be spaced apart from the light emitting area EA. In fig. 2, a dotted cross-hatching (point hatching) (or shading) is used to indicate the dykes (115 shown in fig. 3). The pattern portion 120 according to one example may be provided to surround the light emitting area EA in the form of a slit (slit) or a groove (trench). For example, the width of the pattern portion 120 may be formed to decrease from the reflection portion 130 toward the substrate 110. As shown in fig. 2, the pattern portion 120 may also include an exposed area not covered by the bank 115. Thus, the pattern part 120 may be expressed as terms such as grooves (grooves), slits, trenches, bank slots (bank slots), and bank trenches (bank trench).

The reflective part 130 according to one example may be formed to be concave along the outline of the pattern part 120 formed to be concave near the non-light emitting region NEA, thereby being formed to be concave near the non-light emitting region NEA. The reflection part 130 may be made of a material capable of reflecting light, and may reflect light emitted from the light emitting area EA and directed to the adjacent sub-pixel SP toward the light emitting area EA of the sub-pixel SP for emitting light. As shown in fig. 3, since the reflective part 130 is disposed to be inclined while surrounding the light emitting area EA, the reflective part 130 may be expressed as a term such as a side reflective part or an inclined reflective part. As shown in fig. 3 and 4, the reflection part 130 may include a flat surface 131 disposed in the second region A2 and a curved surface 132 connected to the flat surface 131. The flat face 131 may be disposed parallel to the bottom surface 120b (shown in fig. 4) of the pattern portion 120. The curved surface 132 may be formed to have a circular (rounded shape) profile along the inclined surface 120s of the pattern portion 120. Most of the light emitted from the sub-pixel for light emission SP may be reflected by the curved surface 132 and then emitted to the light emitting area EA of the sub-pixel for light emission SP or the non-light emitting area NEA of the sub-pixel for light emission SP.

Meanwhile, the display device 100 according to one embodiment of the present disclosure may be implemented in a bottom emission type in which light emitted from the light emitting area EA is emitted to the lower surface of the substrate 110. Accordingly, in the display device 100 according to one embodiment of the present disclosure, the light emitted to the lower surface of the substrate 110 may be the light in which direct light emitted from the light emitting area EA and directly emitted to the lower surface of the substrate 110 and reflected light obtained by reflecting the light emitted from the light emitting area EA and directed to the adjacent sub-pixel SP by the reflecting portion 130 and emitting the light to the lower surface of the substrate 110 are combined with each other. The reflected light may include reflected light that is guided (wave-guided) at an interface between the light emitting layer and the electrode and reflected by the reflection part 130 and then emitted to the substrate 110. Accordingly, the display device 100 according to one embodiment of the present disclosure may further improve light extraction efficiency as compared to a display device not provided with the reflective portion 130 formed to be concave.

Hereinafter, with reference to fig. 1 to 5, a display device 100 according to an embodiment of the present document will be described in more detail.

Referring to fig. 1 to 3, a display device 100 according to one embodiment of the present disclosure may include a display panel having a gate driver GD, a light extraction part 140 overlapping with a light emitting area EA, a source driving integrated circuit (hereinafter, referred to as an "IC") 160, a flexible film 170, a circuit board 180, and a timing controller 190.

The display panel may include a substrate 110 and an opposite substrate 200 (shown in fig. 3).

The substrate 110 may include a thin film transistor, and may be a transistor array substrate, a lower substrate, a base substrate (base substrate), or a first substrate. The substrate 110 may be a transparent glass substrate or a transparent plastic substrate. The substrate 110 may include a display area DA and a non-display area NDA. For example, the display area DA may be disposed in a central portion of the display panel. The display area DA may include a plurality of pixels P.

The opposite substrate 200 may encapsulate (or seal) the display area DA disposed on the substrate 110. For example, the opposite substrate 200 may be bonded to the substrate 110 via an adhesive member (or transparent adhesive tape). The opposite substrate 200 may be an upper substrate, a second substrate, or an encapsulation substrate.

The gate driver GD supplies a gate signal to the gate line according to a gate control signal input from the timing controller 190. The gate driver GD may be formed on one side of the display area DA or in a non-display area NDA outside both sides of the display area DA in a gate-in-panel (GIP) method, as shown in fig. 1.

The non-display area NDA is an area on which an image is not displayed, and may be a peripheral area, a signal supply area, an inactive area (INACTIVE AREA), or a frame area (bezel area). The non-display area NDA may be configured to be located near the display area DA. That is, the non-display area NDA may be disposed to surround the display area DA.

The pad region PA may be disposed in the non-display region NDA. The pad area PA may supply a signal and/or power for outputting an image to the pixels P provided in the display area DA. Referring to fig. 1, the pad area PA may be disposed above the display area DA.

The source driving ICs 160 receive digital video data and source control signals from the timing controller 190. The source driving IC 160 converts digital video data into analog data voltages according to source control signals and supplies the analog data voltages to the data lines. When the source drive ICs 160 are manufactured as the drive chips, the source drive ICs 160 may be packaged in the flexible film 170 in a chip-on-film (COF) method or a chip-on-plastic (COP) method.

Pads such as data pads may be formed in the non-display area NDA of the display panel. A line connecting the pad with the source drive IC 160 and a line connecting the pad with the line of the circuit board 180 may be formed in the flexible film 170. The flexible film 170 may be attached to the pads by using an anisotropic conductive film (anisotropic conducting film), whereby the pads may be connected to the wires of the flexible film 170.

The circuit board 180 may be attached to the flexible film 170. A plurality of circuits implemented as a driving chip may be packaged in the circuit board 180. For example, the timing controller 190 may be packaged in the circuit board 180. The circuit board 180 may be a printed circuit board or a flexible printed circuit board.

The timing controller 190 receives digital video data and timing signals from an external system board through a cable of the circuit board 180. The timing controller 190 generates a gate control signal for controlling an operation timing of the gate driver GD and a source control signal for controlling the source drive IC 160 based on the timing signals. The timing controller 190 supplies a gate control signal to the gate driver GD and supplies a source control signal to the source drive IC 160.

Referring to fig. 2 and 3, the substrate 110 according to one example may include a light emitting region EA and a non-light emitting region NEA.

The substrate 110 according to one example may include a gate line, a data line, a pixel driving power line, and a plurality of pixels P. Each of the plurality of pixels P may include a plurality of sub-pixels SP that may be defined by gate lines and data lines.

Meanwhile, at least four sub-pixels, which are provided to emit light of different colors and are disposed adjacent to each other, among the plurality of sub-pixels SP may constitute one pixel P (or unit pixel). One pixel P may include, but is not limited to, a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel. One pixel P may include three sub-pixels SP provided to emit light of different colors and disposed adjacent to each other. For example, one pixel P may include red, green, and blue sub-pixels.

Each of the plurality of sub-pixels SP includes a thin film transistor and a light emitting element layer E connected to the thin film transistor. Each light emitting element layer E may include a light emitting layer (or an organic light emitting layer) interposed between the pixel electrode and the reflective electrode.

When a gate signal is inputted from a gate line using a thin film transistor for each sub-pixel SP, a predetermined current is supplied to the organic light emitting element according to a data voltage of a data line. For this, the light emitting layer of each sub-pixel may emit light having a predetermined brightness (brightness) according to the predetermined current.

The plurality of sub-pixels SP according to one example may be disposed adjacent to each other in the first direction (X-axis direction). Based on fig. 2, the first direction (X-axis direction) may be a horizontal direction. The horizontal direction may be a direction along which the gate line GL and/or the sensing line SL are disposed.

The second direction (Y-axis direction) is a direction crossing the first direction (X-axis direction), and may be a vertical direction based on fig. 2. The vertical direction may be a direction along which the data lines DL are disposed.

The third direction (Z-axis direction) is a direction intersecting each of the first direction (X-axis direction) and the second direction (Y-axis direction), and may be a thickness direction of the display device 100.

The plurality of sub-pixels SP may include a first sub-pixel SP1, a second sub-pixel SP2, a third sub-pixel SP3, and a fourth sub-pixel SP4 arranged adjacent to each other in the first direction (X-axis direction). For example, the first subpixel SP1 may be a red subpixel, the second subpixel SP2 may be a green subpixel, the third subpixel SP3 may be a blue subpixel, and the fourth subpixel SP4 may be a white subpixel, but is not limited thereto. However, the arrangement order of the first, second, third, and fourth sub-pixels SP1, SP2, SP3, and SP4 may be changed.

Each of the first to fourth sub-pixels SP1 to SP4 may include a light emitting area EA and a circuit area CA. The light emitting area EA may be disposed at one side (or upper side) of the sub-pixel area, and the circuit area CA may be disposed at the other side (or lower side) of the sub-pixel area. For example, in the second direction Y, the circuit area CA may be disposed at the lower side of the light emitting area EA. The light emitting areas EA of the first to fourth sub-pixels SP1 to SP4 may have different sizes (or areas).

The first to fourth sub-pixels SP1 to SP4 may be disposed adjacent to each other along the first direction (X-axis direction). For example, two data lines DL extending in the second direction (Y-axis direction) may be disposed in parallel with each other between the first and second sub-pixels SP1 and SP2 and between the third and fourth sub-pixels SP3 and SP 4. The pixel power supply line EVDD extending in the first direction (X-axis direction) may be disposed between the light emitting area EA and the circuit area CA of each of the first to fourth sub-pixels SP1 to SP 4. The gate line GL and the sensing line SL extending in the first direction (X-axis direction) may be disposed under the circuit area CA. The pixel power line EVDD extending in the second direction (Y-axis direction) may be disposed at one side of the first or fourth sub-pixel SP1 or SP 4. A reference line RL extending in the second direction (Y-axis direction) may be disposed between the second subpixel SP2 and the third subpixel SP 3. The reference line RL may be used as a sensing line for externally sensing a change in characteristics of a driving thin film transistor disposed in the circuit area CA and/or a change in characteristics of a light emitting element layer in a sensing driving mode of the pixel P.

In the display device 100 according to one embodiment of the present disclosure, each of the plurality of sub-pixels SP may include the light extraction part 140. The light extraction part 140 may be formed on the cover layer 113 (shown in fig. 3) to overlap the light emitting area EA of the sub-pixel. The light extraction part 140 may be formed on the cover layer 113 of the light emitting area EA to have a curved (or rugged) shape, thereby changing a propagation path of light emitted from the light emitting element layer E to increase light extraction efficiency. For example, the light extraction part 140 may be a non-flat part, a rugged pattern part, a microlens part, or a light scattering pattern part.

The light extraction part 140 may include a plurality of concave parts 141. The plurality of concave portions 141 may be formed to be concave inside the cover layer 113. For example, the plurality of concave portions 141 may be formed or configured to be concave from the upper surface 1131a of the first layer 1131 included in the cover layer 113. Accordingly, the first layer 1131 may include a plurality of concave portions 141. The first layer 1131 may be disposed between the substrate 110 and the light emitting element layer E.

The second layer 1132 of the capping layer 113 may be disposed between the first layer 1131 and the light emitting element layer E (or the pixel electrode 114 shown in fig. 3). The second layer 1132 according to one example may be formed to be wider than the pixel electrode 114 in the first direction (X-axis direction). Accordingly, a portion of the second layer 1132 may overlap the light emitting region EA, and other portions of the second layer 1132 may contact a portion of the bottom surface 120b while covering the inclined surface 120s of the pattern part 120. That is, as shown in fig. 3, the second layer 1132 may extend from the light emitting region EA to the first region A1, and thus may contact a portion of the bottom surface 120b while covering the inclined surface 120s of the pattern portion 120. Since the pixel electrode 114 is disposed on the upper surface 1132a of the second layer 1132, the upper surface 1132a of the second layer 1132 may be set to be flat.

Meanwhile, the refractive index of the second layer 1132 may be greater than that of the first layer 1131. Accordingly, as shown in fig. 4, the path of light emitted from the light emitting layer 116 and directed toward the substrate 110 may be changed toward the reflective portion 130 due to the difference in refractive index between the second layer 1132 and the first layer 1131 of the light extraction portion 140. Accordingly, light having a path formed by the light extraction part 140 toward the reflection part 130 may be reflected by the reflection part 130 and emitted toward the light emitting area EA of the sub-pixel SP for emitting light. Hereinafter, light reflected by the reflection part 130 and emitted toward the substrate 110 will be defined as reflected light.

The reflected light according to one example may include a first reflected light L1 (shown in fig. 3) reflected from the reflective portion 130 and emitted to the substrate 110 after being subjected to the optical waveguide by total reflection between the pixel electrode 114 and the reflective electrode 117, a second reflected light L2 (shown in fig. 4) reflected from the reflective portion 130 and emitted to the substrate 110 after its path is changed by the light extraction portion 140, and a third reflected light L3 (shown in fig. 4) emitted from the light emitting area EA and reflected by the line 150, the reflective portion 130, and the reflective electrode 117 in this order and then emitted to the substrate 110.

The first and third reflected lights L1 and L3 according to one example may be emitted from the light emitting area EA to the substrate 110. The second reflected light L2 may be emitted to the substrate 110 from a position spaced apart from the light emitting area EA. That is, the second reflected light L2 may be emitted from the non-light emitting region NEA or the peripheral region to the substrate 110. In the case of a general display device, since pixel drive lines for pixel drive are provided between banks, a part of light emitted from a light emitting region is covered by the pixel drive lines, and thus cannot be emitted to a substrate. However, in the display device 100 according to one embodiment of the present disclosure, the first data line DL1 disposed in the first region A1 is formed of a reflective line such that light directed to the first data line DL1 may be reflected by the first data line DL1 and emitted to the substrate 110 through the reflective portion 130 and the reflective electrode 117. Accordingly, the display device 100 according to one embodiment of the present disclosure may perform light extraction by using the reflection line, thereby maximizing light extraction efficiency of the emitted light.

Meanwhile, as shown in fig. 4 and 5, the second reflected light L2 may be emitted to the substrate 110 from a position spaced apart from the light emitting area EA, but is not limited thereto. The first reflected light L1 may be emitted to the substrate 110 from a position spaced apart from the light emitting area EA.

In the display device 100 according to one embodiment of the present disclosure, since the pattern portion 120 is disposed to surround the light emitting area EA, at least a portion of the reflection portion 130 on the pattern portion 120 may be disposed to surround the light emitting area EA. Thus, the reflected light may be emitted 110 toward the substrate from a position spaced apart from the light emitting area EA while surrounding at least a portion of the light emitting area EA. As shown in the image of fig. 5, it can be seen that reflected light is between the sub-pixels SP and emitted from the corner of each sub-pixel SP. The corner may be an edge portion. In the case of a general display device, since corners of the light emitting region are bent at a predetermined angle, light emitting efficiency may be reduced compared to a central portion of the light emitting region. In contrast, in the display device 100 according to one embodiment of the present disclosure, since the reflection part 130 is disposed in a non-light emitting region surrounding corners of a light emitting region, even if the corners of the light emitting region are bent at a predetermined angle, light extraction can be performed, whereby the overall light emitting efficiency can be increased.

Meanwhile, since fig. 5 is exemplary, reflected light may be emitted from a position spaced apart from the light emitting area EA while surrounding the entire light emitting area EA. Accordingly, in the display device 100 according to one embodiment of the present disclosure, since light dissipated by the optical waveguide and/or light dissipated by the interface total reflection may be emitted from the non-light emitting region NEA to the substrate in the form of reflected light through the reflection portion 130 surrounding the light emitting region EA, light extraction efficiency may be improved and overall light emitting efficiency may be increased.

Further, in the display device 100 according to one embodiment of the present disclosure, since light that cannot be emitted to the substrate due to being covered by the line can be emitted to the outside through the reflection line 150 provided in the non-light emitting region NEA, light extraction efficiency can be maximized.

Hereinafter, the structure of each of the plurality of sub-pixels SP will be described in detail.

Referring to fig. 3, the display device 100 according to one embodiment of the present disclosure may further include a buffer layer BL, a circuit element layer, a thin film transistor (not shown), a pixel electrode 114, a bank 115, a light emitting layer 116, a reflective electrode 117, an encapsulation layer 118, and a color filter CF.

In more detail, each sub-pixel SP according to one embodiment may include a circuit element layer disposed on an upper surface of the buffer layer BL, the circuit element layer including a gate insulating layer (not shown), an interlayer insulating layer 111, and a passivation layer 112, a capping layer 113 disposed on the circuit element layer, a pixel electrode 114 disposed on the capping layer 113, a bank 115 covering an edge of the pixel electrode 114, a light emitting layer 116 on the pixel electrode 114 and the bank 115, a reflective electrode 117 on the light emitting layer 116, and an encapsulation layer 118 on the reflective electrode 117.

A thin film transistor for driving the sub-pixel SP may be provided on the circuit element layer. The pixel electrode 114, the light emitting layer 116, and the reflective electrode 117 may be included in the light emitting element layer E.

A buffer layer BL may be formed between the substrate 110 and the gate insulating layer to protect the thin film transistor. The buffer layer BL may be disposed on the entire surface (or front surface) of the substrate 110. A pixel power line EVDD for pixel driving may be disposed between the buffer layer BL and the passivation layer 112. The buffer layer BL may serve to block the material contained in the substrate 110 from diffusing into the transistor layer during a high temperature process of a manufacturing process of the thin film transistor.

A thin film transistor (or a driving transistor) according to one example may include an active layer, a gate electrode, a source electrode, and a drain electrode. The active layer may include a channel region, a drain region, and a source region formed in a thin film transistor region of the circuit region of the sub-pixel SP. The active layer may be formed of a semiconductor material.

A gate insulating layer may be formed on the channel region of the active layer. The interlayer insulating layer 111 may be formed to partially overlap the gate electrode and the drain and source regions of the active layer. As shown in fig. 3, an interlayer insulating layer 111 may be formed over the entire sub-pixel SP.

The source electrode may be electrically connected to the source region of the active layer through a source contact hole provided in the interlayer insulating layer 111 overlapping the source region of the active layer. The drain electrode may be electrically connected to the drain region of the active layer through a drain contact hole provided in the interlayer insulating layer 111 overlapping the drain region of the active layer.

A passivation layer 112 may be disposed on the substrate 110 to cover the pixel region. The passivation layer 112 covers the buffer layer BL and the drain, source and gate electrodes of the thin film transistor. A plurality of lines 150 may be disposed between the passivation layer 112 and the interlayer insulating layer 111. For example, the plurality of lines 150 may include a first data line DL1 for driving the first subpixel SP1, a second data line DL2 for driving the second subpixel SP2, a third data line DL3 for driving the third subpixel SP3, and a fourth data line DL4 for driving the fourth subpixel SP 4. The plurality of lines 150 may further include a pixel power line EVDD and a reference line RL. The reference line RL may be disposed at a position symmetrical to the pixel power line EVDD or the like symmetrical to the pixel power line EVDD with reference to the light emitting area EA.

Meanwhile, as shown in fig. 3, the pixel power line EVDD and the first and second data lines DL1 and DL2 may be disposed in the non-light emitting region NEA without covering the light emitting region EA. A passivation layer 112 may be formed over the circuit region and the light emitting region. The passivation layer 112 may be omitted. The color filter CF may be disposed on the passivation layer 112.

A capping layer 113 may be provided on the substrate 110 to cover the passivation layer 112 and the color filters CF. When the passivation layer 112 is omitted, a capping layer 113 may be provided on the substrate 110 to cover the circuit region. The capping layer 113 may be formed in the light emitting region EA and the circuit region CA where the thin film transistor is disposed. In addition, the cover layer 113 may be formed in the entire display area DA and the other non-display area NDA except for the pad area PA of the non-display area NDA. For example, the cover layer 113 may include an extension (or enlarged portion) extending or enlarged from the display area DA to other non-display area NDA than the pad area PA. Accordingly, the cover layer 113 may have a relatively wider size than that of the display area DA.

The cover layer 113 according to one example may be formed to have a thicker thickness, thereby providing a flat surface on the display area DA and the non-display area NDA. For example, the cover layer 113 may be made of an organic material such as photo acryl (photo acryl), benzocyclobutene (benzocyclobutene), polyimide, and fluororesin.

The cover layer 113 formed in the display area DA (or the light emitting area EA) may include a plurality of concave portions 141. The plurality of concave portions 141 are elements of the light extraction portion 140 for increasing the light efficiency of the light emitting area EA, and may be formed inside the cover layer 113. Specifically, as shown in fig. 3, a plurality of depressed portions 141 may be formed in a depressed shape on the first layer 1131 of the cover layer 113. The plurality of concave portions 141 are provided to be connected to each other so that an embossed shape (embossed shape) may be formed in the first layer 1131.

The display device 100 according to one embodiment of the present disclosure may be provided with a plurality of concave portions 141 so as to correspond to the light emitting areas EA, thereby refracting light directed to adjacent sub-pixels toward the sub-pixels for light emission. Accordingly, the display device 100 according to one embodiment of the present disclosure may increase the luminance maintenance rate due to the plurality of concave portions 141 provided in the light emitting area EA (or the opening).

A second layer 1132 having a higher refractive index than that of the first layer 1131 may be formed on the first layer 1131. Of the light emitted from the light emitting element layer E, the path of the light directed to the adjacent sub-pixel SP may be changed toward the reflective portion 130 according to the difference in refractive index between the second layer 1132 and the first layer 1131. The second layer 1132 may be provided in an embossed shape to cover the first layer 1131, and thus the upper surface 1132a may be provided to be flat.

The pixel electrode 114 is formed on the upper surface 1132a of the second layer 1132 such that the pixel electrode 114 may be set to be flat, and the light emitting layer 116 and the reflective electrode 117 formed on the pixel electrode 114 may also be set to be flat. Since the pixel electrode 114, the light emitting layer 116, and the reflective electrode 117, that is, the light emitting element layer E is set to be flat in the light emitting area EA, the thickness of each of the pixel electrode 114, the light emitting layer 116, and the reflective electrode 117 in the light emitting area EA can be uniformly formed. Therefore, the light emitting layer 116 can emit light uniformly in the light emitting area EA without variation.

The plurality of concave portions 141 may be formed on the first layer 1131 by a photo process (photo process) using a mask having an opening portion, and then a patterning (or etching) or ashing process after the first layer 1131 is coated to cover the passivation layer 112 and the color filter CF. The plurality of concave portions 141 may be formed in a region overlapping the color filter CF and/or a region not overlapping the bank 115 of the non-light emitting region NEA, but is not limited thereto. A portion of the plurality of concave portions 141 may be formed to overlap the bank 115.

Referring back to fig. 3, the color filters CF disposed in the light emitting areas EA may be disposed between the plurality of lines 150 and the pattern portion 120 or between the substrate 110 and the cover layer 113. Accordingly, the color filter CF may be disposed between the plurality of lines 150 and the reflective part 130 or between the plurality of lines 150 and the pattern part 120, for example, between the pixel power line EVDD and the reflective part 130 or between the first data line DL1 and the pattern part 120. The color filter CF may include a red color filter (or a first color filter) CF1 for converting white light emitted from the light emitting layer 116 into red light, a blue color filter (or a second color filter) CF2 for converting white light into blue light, and a green color filter (or a third color filter) CF3 for converting white light into green light. The first color filter CF1 may be disposed in the first subpixel SP1, the second color filter CF2 may be disposed in the third subpixel SP3, and the third color filter CF3 may be disposed in the fourth subpixel SP 4. The second sub-pixel, which is a white sub-pixel, may not include a color filter because the light emitting layer 116 emits white light. The color filter CF according to one example may be formed to extend from the light emitting area EA of each of the plurality of sub-pixels SP, through the first area A1, to the second area A2.

Meanwhile, as shown in the left part of fig. 3, in the display device 100 according to one embodiment of the present disclosure, color filters having different colors may be provided to partially overlap each other in boundary portions of the plurality of sub-pixels SP, for example, in a second region A2 between a first region A1 of a first sub-pixel SP1 and a first region A1 of a fourth sub-pixel SP4' of adjacent pixels. In this case, in the display device 100 according to one embodiment of the present disclosure, since the light emitted from each of the sub-pixels SP can be prevented from being emitted to the adjacent sub-pixels SP due to the color filters overlapping each other in the boundary portions of the sub-pixels SP, color mixing between the sub-pixels SP can be avoided. For example, as shown in fig. 3, the first color filter CF1 and the third color filter CF3' of the fourth sub-pixel SP4' adjacent thereto may overlap each other in the second area A2 overlapping with the boundary portion between the first sub-pixel SP1 and the fourth sub-pixel SP4 '.

In the right part of fig. 3, that is, between the first subpixel SP1 and the second subpixel SP2, since the second subpixel SP2 is a white subpixel including no color filter, only the first color filter CF1 may be formed to partially cover the second area A2 through the first area A1 of the first subpixel SP 1. In this case, the first color filter CF1 may partially overlap with the line AL1 (e.g., the first data line DL 1) disposed in the first area A1 and/or the line AL2 (e.g., the second data line DL 2) disposed in the second area A2. As shown in fig. 3, the line AL3 disposed over the first and second areas A1 and A2 may be a pixel power line EVDD. In the display device 100 according to one embodiment of the present disclosure, the line AL1 disposed in the first area A1 among the plurality of lines 150 may be a reflection line. Accordingly, as shown in fig. 4, light directed to the first data line DL1 among the light emitted from the light emitting area EA may be reflected by the first data line DL1 and directed to the reflection part 130. The light directed to the reflection part 130 may be reflected by the reflection part 130 (or the reflection electrode 117) provided in the first region A1 and emitted to the light emitting region EA of the sub-pixel SP for emitting light. Accordingly, the display device 100 according to one embodiment of the present disclosure may further increase the light efficiency in the light emitting area EA.

As a result, in the display device 100 according to one embodiment of the present disclosure, the first subpixel SP1 may include a color filter CF disposed between the reflection line and the pattern portion 120, and the color filter CF may have a structure that does not overlap the first area A1 of the second subpixel SP2 for emitting white light. This structure can also be applied between the sub-pixels SP for emitting colored light.

Meanwhile, unlike the first data line DL1, the second data line DL2 may be disposed in the second region A2. When the second data line DL2 is disposed in the first region A1 of the second subpixel SP2, light reflected by the reflective portion 130 of the second subpixel SP2 is blocked (or interfered) by the second data line DL2, thereby reducing emission efficiency. Accordingly, the second data line DL2 for driving the white subpixel SP2 may be disposed in the second region A2 between the first region A1 of the second subpixel SP2 and the first region A1 of the first subpixel SP 1. In addition, the second data line DL2 disposed in the second region A2 may not be disposed as a reflection line. That is, the second data line DL2 may be set as a non-reflection line. If the second data line DL2 is set as a reflective line, a portion of the light emitted from the first subpixel SP1 may be reflected by the second data line DL2 and emitted toward the second subpixel SP2 to generate color mixture. In addition, the second data line DL2 may be set to partially (at least partially) overlap the first color filter CF1. When the second data line DL2 does not overlap the first color filter CF1, light leakage may occur between the second data line DL2 and the first color filter CF1. Accordingly, in the display device 100 according to one embodiment of the present disclosure, the second data line DL2 is set to be disposed in the second region A2 between the first region A1 of the first subpixel SP1 and the second region A2 of the second subpixel SP2, thereby preventing color mixing with the first subpixel SP1 without affecting the light extraction efficiency of the second subpixel SP 2. Further, in the display device 100 according to one embodiment of the present disclosure, the second data line DL2 may be set to partially overlap the first color filter CF1 in the second region A2, thereby preventing light leakage from occurring when the first subpixel SP1 emits light.

Referring back to fig. 3, the pixel electrode 114 of the sub-pixel SP may be formed on the capping layer 113. The pixel electrode 114 may be connected to a drain electrode or a source electrode of the thin film transistor through a contact hole passing through the capping layer 113 and the passivation layer 112. As shown in fig. 3, the pixel electrode 114 may be set narrower than the second layer 1132, but is not limited thereto. The pixel electrode 114 may be set wider than the second layer 1132 according to the cross-sectional position. For example, when the pixel electrode 114 is set to be wider than the second layer 1132, an edge portion of the pixel electrode 114 may be connected to a drain electrode or a source electrode in the circuit region CA. In this case, an edge portion of the pixel electrode 114 may be covered with the bank 115. The pixel electrode 114 may be made of at least one of a transparent metal material or a semi-transmissive metal material.

Since the display device 100 according to one embodiment of the present disclosure is configured as a bottom emission type, the pixel electrode 114 may be formed of a transparent conductive material (or TCO), such as Indium Tin Oxide (ITO) or Indium Zinc Oxide (IZO) capable of transmitting light, or may be formed of a semi-transmissive conductive material, such as magnesium (Mg), silver (Ag), or an alloy of Mg and Ag.

Meanwhile, the material constituting the pixel electrode 114 may include MoTi. The pixel electrode 114 may be a first electrode or an anode.

The bank 115 is a region where light is not emitted, and may be provided to surround each light emitting portion (or the concave portion 141 of the light extracting portion 140, as shown in fig. 3) of each of the plurality of sub-pixels SP. That is, the bank 115 may separate (or define) the concave portion 141 of each light emitting portion or sub-pixel SP. The light emitting portion may refer to portions where the pixel electrode 114 and the reflective electrode 117 are in contact with the lower surface and the upper surface of the light emitting layer 116 interposed therebetween, respectively.

The bank 115 may be formed to cover an edge of each pixel electrode 114 of each sub-pixel SP and expose a portion of each pixel electrode 114. That is, the bank 115 may partially cover the pixel electrode 114. Accordingly, the bank 115 may prevent the pixel electrode 114 and the reflective electrode 117 from contacting each other at an end of each pixel electrode 114. An exposed portion of the pixel electrode 114 not covered by the bank 115 may be included in a light emitting portion (or a light emitting region). As shown in fig. 3, the light emitting portion may be formed on the plurality of concave portions 141, and thus the light emitting portion (or the light emitting area EA) may overlap the concave portions 141 in the thickness direction of the substrate 110.

As shown in fig. 3 and 4, the bank 115 according to one example may be disposed in the non-light emitting region NEA of each of the plurality of sub-pixels SP. The bank 115 of each of the plurality of sub-pixels SP may be disposed in the first region A1. Accordingly, as shown in fig. 3 and 4, the banks 115 of the plurality of sub-pixels SP may be spaced apart from each other by the second region A2, whereby the light emitting layer 116 and the reflective electrode 117 (or the reflective portion 130) may be disposed closer to the substrate 110 in the second region A2. In other words, since the bank 115 of each sub-pixel SP is not formed in the second region A2, the light emitting layer 116 and the reflective electrode 117 (or the reflective portion 130) may be disposed deeper toward the substrate 110 in the second region A2 than in the first region A1. Accordingly, since the area of the curved surface 132 of the reflection portion 130 can be increased, the reflection area for reflecting light toward the adjacent sub-pixel SP can be increased, whereby the light extraction efficiency can be improved.

After the formation of the bank 115, the light emitting layer 116 may be formed to cover the pixel electrode 114 and the bank 115. Accordingly, the bank 115 may be disposed between the pixel electrode 114 and the light emitting layer 116. The bank 115 may be expressed as a term "pixel defining layer". The bank 115 according to one example may be made of an organic material or an inorganic material. The bank 115 may be formed to have the same or similar thickness along the outline of the pattern portion 120 (or the second layer 1132).

Referring again to fig. 3, a light emitting layer 116 may be formed on the pixel electrode 114 and the bank 115. The light emitting layer 116 may be disposed between the pixel electrode 114 and the reflective electrode 117. Accordingly, when a voltage is applied to each of the pixel electrode 114 and the reflective electrode 117, an electric field is formed between the pixel electrode 114 and the reflective electrode 117. Accordingly, the light emitting layer 116 may emit light. The light emitting layer 116 may be formed in the plurality of sub-pixels SP and may have a common layer disposed on the bank 115.

The light emitting layer 116 according to one embodiment may be configured to emit white light. The light emitting layer 116 may include a plurality of stacks (stacks) that emit different colors of light. For example, the light emitting layer 116 may include a first stack, a second stack, and a Charge Generation Layer (CGL) disposed between the first stack and the second stack. The light emitting layer may be set to emit white light, and thus, each of the plurality of sub-pixels SP may include a color filter CF adapted to a corresponding color.

The reflective electrode 117 may be formed on the light emitting layer 116. The reflective electrode 117 according to one example may include a metal material. The reflective electrode 117 may reflect light emitted from the light emitting layer 116 in the plurality of sub-pixels SP toward the lower surface of the substrate 110. Accordingly, the display device 100 according to one embodiment of the present disclosure may be implemented as a bottom emission type display device.

The display device 100 according to one embodiment of the present disclosure is of a bottom emission type and must reflect light emitted from the light emitting layer 116 toward the substrate 110, and thus the reflective electrode 117 may be made of a metal material having high reflectivity. The reflective electrode 117 according to one example may be formed of a metal material having high reflectivity, such as a stacked structure of aluminum and titanium (Ti/Al/Ti), a stacked structure of aluminum and ITO (ITO/Al/ITO), an Ag alloy, and a stacked structure of an Ag alloy and ITO (ITO/Ag alloy/ITO). The Ag alloy may be an alloy such as silver (Ag), palladium (Pd), and copper (Cu). The reflective electrode 117 may be expressed as terms such as a second electrode, a cathode, and a counter electrode (counter electrode).

Meanwhile, in the display device 100 according to one embodiment of the present disclosure, the reflective portion 130 may be a part of the reflective electrode 117. Accordingly, the reflection part 130 may reflect light directed to the adjacent sub-pixel SP toward the light emitting area EA of the sub-pixel SP for emitting light. Since the reflecting portion 130 is a part of the reflecting electrode 117, as shown in fig. 3, the reflecting portion 130 may be denoted by reference numeral 117 a. In the present disclosure, the reflective portion 130 may refer to the reflective electrode 117 overlapping the pattern portion 120 (or the first and second regions A1 and A2). In particular, the reflective portion 130 may refer to the reflective electrode 117 formed of an inclined surface or a curved surface while overlapping the pattern portion 120. Accordingly, the reflection part 130 may reflect the following light toward the non-light emitting area NEA and/or the light emitting area EA of the sub-pixel SP for light emission: light directed to adjacent subpixels SP, and/or dissipated by total reflection between interfaces, and/or reflected on line 150.

An encapsulation layer 118 is formed on the reflective electrode 117. The encapsulation layer 118 serves to prevent oxygen or moisture from penetrating into the light emitting layer 116 and the reflective electrode 117. To this end, the encapsulation layer 118 may include at least one inorganic film and at least one organic film. Meanwhile, as shown in fig. 3, the encapsulation layer 118 may be disposed not only in the light emitting region EA but also in the non-light emitting region NEA. The encapsulation layer 118 may be disposed between the reflective electrode 117 and the opposite substrate 200.

Hereinafter, the pattern part 120 and the reflection part 130 of the display device 100 according to one embodiment of the present disclosure will be described in more detail with reference to fig. 1 to 6.

In the display device 100 according to one embodiment of the present disclosure, the pattern portion 120 may be disposed near the light emitting area EA (or near the non-light emitting area NEA), and the reflection portion 130 may be disposed on the pattern portion 120 so as to prevent some light emitted from the light emitting element layer from being discharged to the outside due to total reflection and/or disconnection of wires at an interface between the light emitting element layer and an electrode and/or an interface between a substrate and an air layer, resulting in a reduction in light extraction efficiency.

For example, as shown in fig. 3, the pattern portion 120 may be formed to be concave in the first layer 1131 of the cover layer 113. As shown in fig. 3, the pattern portion 120 may be disposed near the non-light emitting region NEA or the light emitting region EA. That is, the pattern portion 120 may be disposed to surround the light emitting area EA while being adjacent to the light extracting portion 140. When the plurality of concave portions 141 are formed in the light emitting region EA, the pattern portion 120 may be formed in the non-light emitting region NEA together with the plurality of concave portions 141. The pattern portion 120 may include a bottom surface 120b and an inclined surface 120s.

The bottom surface 120b of the pattern portion 120 according to one example may extend from the inclined surface 120s formed in the first region A1 and be formed to reach the second region A2. The bottom surface 120b of the pattern portion 120 is a surface formed closest to the substrate 110 in the pattern portion 120, and may be disposed closer to the substrate 110 (or the upper surface of the substrate) than the pixel electrode 114 (or the lower surface of the pixel electrode 114) in the light emitting region EA. Accordingly, as shown in fig. 3, the bottom surface 120b of the pattern part 120 may be set to be equal to or similar in depth to that of each of the plurality of concave parts 141. However, when the depth of the pattern portion 120 is lower than that of the concave portion 141, the area of the reflection portion 130 is reduced, whereby light extraction efficiency may be lowered. Accordingly, in the display device 100 according to one embodiment of the present disclosure, the depth of the pattern portion 120 may be equal to or deeper than the depth of the concave portion 141.

The inclined surface 120s of the pattern portion 120 may be formed in the first region A1 and disposed between the bottom surface 120b and the light extraction portion 140. Accordingly, the inclined surface 120s of the pattern part 120 may be provided to surround the light emitting area EA or the plurality of concave parts 141. As shown in fig. 3, the inclined surface 120s may be connected to the bottom surface 120b. The inclined surface 120s may form a predetermined angle with the bottom surface 120b. For example, the angle formed by the inclined surface 120s and the bottom surface 120b may be an obtuse angle. Accordingly, the width of the pattern portion 120 may gradually decrease from the opposite substrate 200 (or the reflective portion 130) toward the substrate 110 in one direction (or a third direction (Z-axis direction)). Since an obtuse angle is formed between the inclined surface 120s and the bottom surface 120b, the second layer 1132, the bank 115, and the reflective portion 130 (or the light emitting element layer E including the reflective portion 130) formed in a subsequent process may be formed to be concave along the outline of the pattern portion 120. Accordingly, the light emitting element layer E may be formed to be recessed in the pattern portion 120 formed to be recessed in the non-light emitting region NEA (or peripheral region). The light emitting element layer E formed to be recessed in the pattern portion 120 may mean that at least one of the pixel electrode 114, the light emitting layer 116, or the reflective electrode 117 is included therein.

As shown in fig. 2, the pattern portion 120 may be disposed to surround the light emitting area EA. Since the pattern portion 120 is disposed to surround the light emitting area EA, at least a portion of the reflection portion 130 disposed on the pattern portion 120 may be disposed to surround the light emitting area EA. Accordingly, in the display device 100 according to one embodiment of the present disclosure, since light may be extracted even from the non-light emitting region NEA near the light emitting region EA, the overall light efficiency may be improved. Accordingly, the display device 100 according to one embodiment of the present disclosure may have the same light emission efficiency or higher light emission efficiency even in the case of low power, as compared to a general display device without the pattern portion 120 and the reflection portion 130, whereby overall power consumption may be reduced.

In addition, the display device 100 according to one embodiment of the present disclosure may enable the light emitting element layer E to emit light even in the case of low power, thereby improving the lifetime of the light emitting element layer E.

Referring back to fig. 2, the pattern portion 120 may include a first pattern line 121 disposed between the circuit area CA and the light emitting area EA in a first direction (X-axis direction) and a second pattern line 122 disposed in a second direction (Y-axis direction) crossing the first direction (X-axis direction). Referring to fig. 2, the first pattern line 121 may refer to the pattern portion 120 disposed in the horizontal direction, and the second pattern line 122 may refer to the pattern portion 120 disposed in the vertical direction.

The first pattern line 121 may include a bottom surface and an inclined surface. The second pattern line 122 may include a bottom surface and an inclined surface. Since each of the bottom surface and the inclined surface of the first pattern line 121 and each of the bottom surface and the inclined surface of the second pattern line 122 are identical to each of the bottom surface 120b and the inclined surface 120s of the pattern portion 120, a description thereof will be omitted. The first pattern line 121 and the second pattern line 122 may be connected to each other in the non-light emitting region NEA (or the peripheral region) to surround the light emitting region EA. The first pattern lines 121 may be disposed between the sub-pixels SP for emitting the same color light. The second pattern line 122 may be disposed between the subpixels SP for emitting different colors of light.

Since the second pattern line 122 is disposed between the sub-pixels SP for emitting light of different colors, the reflection part 130 on the second pattern line 122 may prevent light of different colors from being emitted to other adjacent sub-pixels SP. Accordingly, the display device 100 according to the present disclosure may prevent color mixing (or color distortion) between the sub-pixels SP for emitting different colors of light, thereby improving color purity.

The second layer 1132 of the cover layer 113 may further extend from the light emitting region EA to the non-light emitting region NEA to partially cover the inclined surface 120s of the pattern portion 120. That is, a portion of the second layer 1132 may extend from the light emitting region EA to the first region A1 to cover the inclined surface 120s of the pattern portion 120. Accordingly, as shown in fig. 3, the end 1132c of the second layer 1132 may contact the bottom surface 120b of the pattern part 120. In this case, the end 1132c of the second layer 1132 may contact only a portion of the bottom surface 120 b. When the second layer 1132 entirely covers the bottom surface 120b, the depth of the reflection part 130 formed on the pattern part 120 may be relatively reduced, thereby reducing reflection efficiency. Accordingly, in the display device 100 according to one embodiment of the present disclosure, the second layer 1132 is provided to be in contact with only a portion of the bottom surface 120b, but does not entirely cover the bottom surface 120b of the pattern part 120, so that the reflection part 130 formed in a subsequent process may be formed close to the bottom surface 120b, whereby reflection efficiency may be improved.

As shown in fig. 3, the bank 115 may extend to cover the inclined surface 1132b of the second layer 1132, the inclined surface 1132b of the second layer 1132 covers the inclined surface 120s of the pattern part 120, and the bank 115 covers the edge of the pixel electrode 114. Accordingly, the bank 115 may contact a portion of the bottom surface 120b of the pattern portion 120 that is not covered by the second layer 1132. When the bank 115 completely covers the bottom surface 120b, the depth of the reflection part 130 formed on the pattern part 120 is reduced, and thus reflection efficiency may be reduced. Accordingly, as shown in fig. 3, the second layer 1132 and the dykes 115 on the bottom surface 120b of the pattern part 120 may each be discontinuously disposed. That is, the second layer 1132 and the dykes 115 may each be disconnected on the bottom surface 120b of the pattern part 120. Accordingly, in the display device 100 according to one embodiment of the present disclosure, the bank 115 is provided to be in contact with only a portion of the bottom surface 120b, but does not entirely cover the bottom surface 120b, so that the reflective portion 130 formed in a subsequent process may be formed close to the bottom surface 120b, whereby reflection efficiency may be improved.

Since the bank 115 is provided to be in contact with only a portion of the bottom surface 120b of the pattern portion 120, the bank 115 may be disconnected from the pattern portion 120 (or in the second region (A2)), as shown in fig. 3 and 4. Since fig. 3 is a sectional view of fig. 2, the pattern portion 120 where the bank 115 is broken may be a second pattern line 122. Accordingly, the bank 115 may be disconnected from the second pattern line 122. When the bank 115 is disconnected from the second pattern line 122, the reflective portion 130 disposed on the second pattern line 122 may be disposed close to the bottom surface of the second pattern line. Accordingly, the reflection part 130 may be formed as deep as possible in the second pattern line 122, compared to a case where the bank is not disconnected from the second pattern line, and thus reflection efficiency may be improved. Since the second pattern line 122 is disposed between the sub-pixels SP for emitting the light of the different colors, color mixing or color distortion between the sub-pixels SP for emitting the light of the different colors can be prevented to the greatest extent. As shown in fig. 2, since the second pattern line 122 is disposed between the subpixels SP for emitting different colors of light, the second layer 1132, the bank 115, the light emitting layer 116, and the reflective part 130 (or the reflective electrode 117) may be set to be symmetrical based on the center of the pattern part 120 (or the second pattern line 122).

The first pattern lines 121 may be disposed between the sub-pixels SP for emitting the same color light. Accordingly, as shown in fig. 10, which will be described later, the second layer 1132 may be formed only to the first region A1 adjacent to the light emitting region EA, and the second layer 1132 may not be formed on the opposite side of the light emitting region EA with reference to the first pattern line 121. As a result, since the first pattern lines 121 are disposed between the sub-pixels SP for emitting the same color light, the bank 115, the light emitting layer 116, and the reflective portion 130 (or the reflective electrode 117) may be set to be asymmetric based on the center of the pattern portion 120 (or the first pattern lines 121), as shown in fig. 10.

Referring back to fig. 2, the first pattern line 121 may be disposed between the circuit area CA and the light emitting area EA. The pixel electrode 114 may extend to the circuit area CA along the outline of the first pattern line 121. Accordingly, an edge of the pixel electrode 114 disposed in the circuit region CA may be in contact with a source or drain of the thin film transistor.

Fig. 5 is an image showing light extraction characteristics of a non-light emitting region of the display device 100 according to one embodiment of the present disclosure, and shows a state in which all four sub-pixels SP emit light. Of the light emitted from the light emitting area EA, light directed to the adjacent sub-pixel SP by total reflection between interfaces or directed to the adjacent sub-pixel SP due to path change caused by the light extraction part and/or light reflected by the line 150 and directed to the adjacent sub-pixel SP may be reflected in the reflection part 130 formed to be concave on the pattern part 120. Accordingly, as shown in fig. 5, at least some of the reflected light reflected by the reflection part 130 may be emitted from a position surrounding the light emitting area EA of each sub-pixel SP while being spaced apart from the light emitting area EA. Accordingly, in the display device 100 according to one embodiment of the present disclosure, since light dissipated by the optical waveguide and/or light dissipated by total reflection of the interface and/or (extinguished) light blocked by the line and disappeared may be emitted from the non-light-emitting region NEA in the form of reflected light through the reflection portion 130 surrounding at least a portion of the light-emitting region EA, light extraction efficiency may be improved and overall light-emitting efficiency may be increased.

Further, since the light may be extracted even from the non-light emitting region NEA due to the reflection part 130 provided in the non-light emitting region NEA, the display device 100 according to one embodiment of the present disclosure may have the same light emitting efficiency or further improved light emitting efficiency even in the case of low power, compared to a general display device without the reflection part, so that overall power consumption may be reduced.

Fig. 6 is an enlarged view showing the a portion shown in fig. 3, showing a color filter provided in a non-light emitting region.

Referring to fig. 6, in the display device 100 according to one embodiment of the present disclosure, each of the plurality of sub-pixels SP may include a color filter CF. However, since the light emitting layer 116 emits white light, the color filter CF may not be disposed in the second subpixel SP 2. Accordingly, the first, third, and fourth sub-pixels SP1, SP3, and SP4 may include first, second, and third color filters CF1, CF2, and CF3, respectively.

The color filter CF according to one example may be formed up to at least a portion of the second area A2 by passing through the first area A1 in the light emitting area EA of each of the plurality of sub-pixels SP. This is to prevent color mixing between the plurality of sub-pixels SP or light leakage in boundary portions (or border lines) between the plurality of sub-pixels SP.

In the display device 100 according to one embodiment of the present invention, the distance L from the end of the color filter CF to the end of the light emitting area EA of each of the plurality of sub-pixels SP may be set to satisfy l.gtoreq.d.tan θc,

Where D is a distance from the light emitting layer 116 to the lower surface of the color filter CF (or a boundary surface between the passivation layer 112 and the color filter CF), and θc may be a critical angle (threshold angle) at which light emitted from the light emitting layer 116 is totally reflected on the upper surface of the substrate 110.

Or in the display device 100 according to one embodiment of the present disclosure, the distance L from the end of the color filter CF to the end of the light emitting area EA of each of the plurality of sub-pixels SP may be set to satisfy

L≥D*tan(arcsin(n1/n2)),

Where D is a distance from the light emitting layer 116 to a lower surface of the color filter CF (or a boundary surface between the passivation layer 112 and the color filter CF), n1 is a refractive index of the light emitting layer 116, and n2 may be a refractive index of the substrate 110 (or the passivation layer 112).

That is, in the display device 100 according to one embodiment of the present disclosure, the distance L from the end of the color filter CF to the end of the light emitting area EA of each of the plurality of sub-pixels SP may be greater than or equal to a value obtained by multiplying tan θc (or tan (arcsin (n 1/n 2)) by the distance D from the light emitting layer 116 to the lower surface of the color filter CF (or the boundary surface between the passivation layer 112 and the color filter CF).

Accordingly, in the display device 100 according to one embodiment of the present disclosure, as shown in fig. 6, light emitted from the sub-pixel SP for light emission may be emitted to the first region A1 or the second region A2 of the sub-pixel SP for light emission through the color filter CF provided in the first region A1 or the second region A2. As a result, in the display device 100 according to one embodiment of the present disclosure, since light having a color of the sub-pixel SP for light emission can be emitted even in the first region A1 or the second region A2 of the non-light emitting region NEA, the overall light emitting efficiency (or light extraction efficiency) can be increased. Further, in the display device 100 according to one embodiment of the present disclosure, since the distance from the light emitting area EA to the end of the color filter CF may be determined by the above equation, color mixing with the adjacent sub-pixel SP may be avoided, and light leakage may also be avoided.

In the display device 100 according to one embodiment of the present disclosure, a distance (or width) of a portion of the color filter CF (from the light emitting area EA to an end of the color filter CF) may be determined by the above equation, and the color filter CF may be a color filter CF of a color sub-pixel (e.g., the first sub-pixel SP1 or the third sub-pixel SP 3) adjacent to the white sub-pixel (i.e., the second sub-pixel SP 2). This is because the second data line DL2 for driving the second subpixel SP2 is not disposed in the first area A1 of the second subpixel SP2 but disposed in the second area A2 so as to prevent light extraction attenuation of the second subpixel SP 2. Accordingly, as shown in fig. 6, the first color filter CF1 of the first subpixel SP1 adjacent to the second subpixel SP2 as the white subpixel may overlap at least a portion of the second data line DL2 by the above equation. Accordingly, the display device 100 according to one embodiment of the present disclosure may prevent light extraction attenuation of the second subpixel SP2, while may prevent color mixing from occurring between the first subpixel SP1 and the second subpixel SP2, and light leakage from occurring in a boundary portion between the first subpixel SP1 and the second subpixel SP 2.

Meanwhile, as shown in fig. 6, the reflection part 130 may be positioned close to the bottom surface 120b of the pattern part 120 due to the concave shape of the pattern part 120. Therefore, of the light emitted from the light emitting layer 116, the light directed to the adjacent sub-pixel SP (or a portion of the light directed to the adjacent second sub-pixel SP beyond θc) may be blocked by the reflective portion 130 (or the reflective electrode 117) in the first region A1 and/or the second region A2, thereby preventing color mixing with the adjacent sub-pixel SP.

Hereinafter, a relationship between the line 150 and the color filter CF in the non-light emitting region NEA surrounding each of the first to fourth sub-pixels SP1 to SP4 will be described with reference to fig. 7 to 10.

Fig. 7 is a schematic sectional view taken along the line II-II 'shown in fig. 2, fig. 8 is a schematic sectional view taken along the line III-III' shown in fig. 2, fig. 9 is a schematic sectional view taken along the line IV-IV 'shown in fig. 2, and fig. 10 is a schematic sectional view taken along the line V-V' shown in fig. 2.

Fig. 7 shows the structure of the non-light emitting region NEA between the second subpixel SP2 and the third subpixel SP3, fig. 8 shows the structure of the non-light emitting region NEA between the third subpixel SP3 and the fourth subpixel SP4, fig. 9 shows the structure of the non-light emitting region NEA between the first subpixel SP1 and the fourth subpixel SP4' of an adjacent pixel, and fig. 10 shows the structure of the non-light emitting region NEA between those including the light emitting region EA and the circuit region CA of the first subpixel SP 1.

Referring to fig. 7, the reference line RL may be disposed between the second subpixel SP2 and the third subpixel SP 3. The reference line RL according to one example may have a size overlapping with a boundary portion (or boundary line) between the second subpixel SP2 and the third subpixel SP 3. In more detail, the reference line RL may be formed to extend from the first region A1 of the second subpixel SP2 to the second region A2 adjacent to the first region A1 of the third subpixel SP 3. Thus, the reference line RL may be included in the line AL3 formed over the first and second regions A1 and A2. In this case, the second color filter CF2 may extend from the light emitting area EA of the third subpixel SP3 to the second area A2 adjacent to the first area A1 of the second subpixel SP2, and partially overlap the reference line RL in the second area A2.

Therefore, as shown in fig. 7, light emitted from the light emitting area EA of the second subpixel SP2 and reflected by the reflective portion 130 (or the reflective electrode 117) may be blocked by the second color filter CF2 and the reference line RL so as not to be emitted to the outside. Therefore, color mixing between the second subpixel SP2 and the third subpixel SP3 can be avoided. Further, in this case, unlike the line AL1 provided in the first area A1, the reference line RL may not be a reflection line. When the reference line RL is a reflection line, light having passed through the second color filter CF2 may be reflected on the reference line RL (or an upper surface of the reference line RL) and emitted toward the third subpixel SP3 to generate color mixture. Accordingly, in the display device 100 according to one embodiment of the present disclosure, since the second color filter CF2 is disposed to cover the second area A2 through the first area A1 of the third subpixel SP3 and the reference line RL is provided as a non-reflection line, color mixing of the second subpixel SP2 and the third subpixel SP3 may be prevented to the greatest extent, but the present disclosure is not limited thereto. Only that portion of the reference line RL that is disposed in the first region A1 may be provided as the reflection line.

Meanwhile, light emitted from the light emitting area EA of the third subpixel SP3 and reflected by the reflecting portion 130 may be emitted from the first area A1 not blocked by the reference line RL. Therefore, the light extraction efficiency of the third subpixel SP3 can be improved.

Referring to fig. 8, the third and fourth data lines DL3 and DL4 may be disposed between the third and fourth sub-pixels SP3 and SP 4. Since the third data line DL3 is used to drive the third subpixel SP3, the third data line DL3 may be disposed in the first area A1 of the third subpixel SP 3. Since the fourth data line DL4 is used to drive the fourth subpixel SP4, the fourth data line DL4 may be disposed in the first area A1 of the fourth subpixel SP 4. Accordingly, the third and fourth data lines DL3 and DL4 may be included in the line AL1 disposed in the first area A1. In addition, the third and fourth data lines DL3 and DL4 may each be provided as a reflection line to reflect light directed to the reflection line among the light emitted from the light emitting area EA of each sub-pixel SP, thereby improving the light extraction efficiency of each sub-pixel SP.

Referring back to fig. 8, the second and third color filters CF2 and CF3 may be formed to pass through the first to second regions A1 to A2 from the light emitting region EA of each sub-pixel SP. Accordingly, the second color filter CF2 may overlap the third data line DL3 in the first region A1 of the third subpixel SP3, and may overlap the third color filter CF3 in the second region A2. The third color filter CF3 may overlap the fourth data line DL4 in the first region A1 of the fourth subpixel SP4 and may overlap the second color filter CF2 in the second region A2.

In addition, the second and third color filters CF2 and CF3 may overlap each other over the entire second area A2 overlapping with the boundary portion (or boundary line) between the third and fourth sub-pixels SP3 and SP 4. Since the second color filter CF2 and the third color filter CF3 overlap each other in the entire second area A2 between the third subpixel SP3 and the fourth subpixel SP4, neither the light emitted from the third subpixel SP3 nor the light emitted from the fourth subpixel SP4 can be emitted to the lower surface of the substrate 110 through the second area A2. Accordingly, in the display device 100 according to one embodiment of the present disclosure, the color filters CF of different colors may be set to overlap each other in the second region A2 between the sub-pixels SP provided with the color filters CF of different colors, so that occurrence of color mixing may be prevented.

Referring to fig. 9, the pixel power line EVDD may be disposed between the first subpixel SP1 and the fourth subpixel SP4' of the pixel adjacent to the first subpixel SP 1. The pixel power line EVDD according to one example may have a size overlapping with a boundary portion (or boundary line) between the first subpixel SP1 and the fourth subpixel SP4' of the pixel adjacent to the first subpixel. In more detail, the pixel power line EVDD may be formed to extend from the first region A1 of the first subpixel SP1 to the second region A2 adjacent to the first region A1 of the fourth subpixel SP 4'. Accordingly, the pixel power line EVDD may be included in a line AL3 formed over the first and second areas A1 and A2. In this case, the first color filter CF1 of the first subpixel SP1 may extend from the light emitting area EA of the first subpixel SP1 to the second area A2 adjacent to the first area A1 of the fourth subpixel SP4' to partially overlap the pixel power line EVDD in the second area A2. The third color filter CF3' of the fourth subpixel SP4' of the adjacent pixel may extend from the light emitting area EA of the fourth subpixel SP4' to the second area A2 adjacent to the first area A1 of the first subpixel SP1 to partially overlap the pixel power line EVDD in the second area A2. Accordingly, the first color filter CF1 may overlap a portion of the pixel power line EVDD in the first region A1 of the first subpixel SP1 and may overlap a portion of the pixel power line EVDD in the second region A2 and a color filter (or third color filter CF3 ') of the adjacent fourth subpixel SP 4'. Likewise, the color filter (or the third color filter CF3 ') of the fourth subpixel SP4' may overlap a portion of the pixel power line EVDD in the first region A1 of the fourth subpixel SP4' and may overlap a portion of the pixel power line EVDD in the second region A2 and a portion of the first color filter CF1 of the adjacent first subpixel SP 1.

Referring to fig. 9, the color filter (or the third color filter CF3 ') of the fourth subpixel SP4' of the pixel adjacent to the first color filter CF1 of the first subpixel SP1 may overlap the entire second area A2, and the entire second area A2 overlaps a boundary portion (or boundary line) between the first subpixel SP1 and the fourth subpixel SP4 '. Since the first and third color filters CF1 and CF3' overlap each other in the entire second region A2 between the first and fourth sub-pixels SP1 and SP4', neither the light emitted from the first sub-pixel SP1 nor the light emitted from the fourth sub-pixel SP4' can be emitted to the lower surface of the substrate 110 through the second region A2. Accordingly, in the display device 100 according to one embodiment of the present disclosure, the color filters CF of different colors may be set to overlap each other in the second region A2 between the sub-pixels SP provided with the color filters CF of different colors, so that occurrence of color mixing may be prevented.

Light emitted from the light emitting area EA of the first subpixel SP1 and reflected by the reflective portion 130 (or the reflective electrode 117) may be blocked by the first color filter CF1 and the reference line RL, and thus cannot be emitted to the outside. The light emitted from the light emitting area EA of the fourth subpixel SP4 'and reflected by the reflective part 130 (or the reflective electrode 117) may be blocked by the third color filter CF3' and the pixel power line EVDD, and thus cannot be emitted to the outside. Therefore, color mixing between the first subpixel SP1 and the fourth subpixel SP4' adjacent thereto can be avoided. Further, in this case, the pixel power line EVDD may not be a reflection line unlike the line AL1 provided in the first area A1. When the pixel power line EVDD is a reflection line, light having passed through the first color filter CF1 may be reflected on the pixel power line EVDD (or an upper surface of the pixel power line EVDD) and emitted toward the fourth subpixel SP4' to generate color mixture. Similarly, when the pixel power line EVDD is a reflective line, light passing through the third color filter CF3' is reflected on the pixel power line EVDD (or an upper surface of the pixel power line EVDD) and emitted toward the first subpixel SP1 to generate color mixture. Accordingly, in the display device 100 according to one embodiment of the present disclosure, since the first color filter CF1 is disposed to cover the second area A2 through the first area A1 of the first subpixel SP1, and the third color filter CF3 is disposed to cover the second area A2 through the first area A1 of the fourth subpixel SP4', and the pixel power line EVDD is provided as a non-reflective line, color mixing of the first subpixel SP1 and the fourth subpixel SP4' adjacent thereto can be prevented to the greatest extent.

Meanwhile, the light emitted from the light emitting area EA of the first subpixel SP1 and reflected by the reflecting portion 130 may be emitted from the first area A1 of the first subpixel SP1 not blocked by the pixel power line EVDD or the light emitting area EA of the first subpixel SP 1. In addition, the light emitted from the light emitting area EA of the fourth subpixel SP4' of the adjacent pixel and reflected by the reflection part 130 may be emitted from the first area A1 of the fourth subpixel SP4' not blocked by the pixel power line EVDD or the light emitting area EA of the fourth subpixel SP4 '. Accordingly, the light extraction efficiency of each of the first subpixel SP1 and the fourth subpixel SP4' of the adjacent pixel can be improved.

Referring to fig. 10, the pixel power supply line EVDD disposed in the first direction (X-axis direction) may be disposed between the light emitting region EA including the first subpixel SP1 and those of the circuit region CA. The pixel power line EVDD disposed in the first direction (X-axis direction) is electrically connected to the pixel power line EVDD disposed in the second direction (Y-axis direction) to apply the pixel power to the plurality of sub-pixels SP. The pixel power supply line EVDD disposed in the first direction (X-axis direction) passes between the light emitting area EA and the circuit area CA of each sub-pixel SP, and thus may be formed to be thinner than the pixel power supply line EVDD disposed in the second direction (Y-axis direction) outside the pixel P. Accordingly, the pixel power line EVDD disposed in the first direction (X-axis direction) and passing between the light emitting area EA and the circuit area CA may be disposed only in the first area A1 as shown in fig. 10. Accordingly, the pixel power line EVDD disposed in the first area A1 may be provided as a reflection line, thereby improving light extraction efficiency of the first sub-pixel SP.

Meanwhile, the first color filter CF1 of the first subpixel SP1 may not be disposed in the circuit area CA adjacent to the light emitting area EA of the first subpixel SP1 in the second direction (Y-axis direction). This is because, when the color filter CF is disposed on the circuit area CA, when a contact hole for connecting the pixel electrode 114 with the thin film transistor of the circuit area CA is formed, the thin film transistor may be contaminated by the color filter CF. Accordingly, as shown in fig. 10, the first color filter CF1 of the first subpixel SP1 may be formed so as not to cover the circuit area CA in the second direction (Y-axis direction). For example, the first color filter CF1 may be formed to reach a second region A2 adjacent to the first region A1 of the circuit region CA by passing through the first region A1 adjacent to the light emitting region EA in the second direction (Y-axis direction). Accordingly, the first color filter CF1 may overlap the pixel power line EVDD disposed in the first direction (X-axis direction) and may be disposed up to the second area A2. As a result, the display device 100 according to one embodiment of the present disclosure may improve light extraction efficiency of light emitted from the light emitting area EA of the first subpixel SP1 by the pixel power line EVDD provided in the first area A1, and may prevent light from being emitted toward the circuit area CA due to the first color filter CF1 formed in the second direction (Y-axis direction) up to the second area A2. Further, in the display device 100 according to one embodiment of the present disclosure, since the color filter CF is not disposed on the circuit area CA, the thin film transistor can be prevented from being contaminated by the material constituting the color filter when the contact hole is formed.

Referring back to fig. 10, since the predetermined region including the circuit region CA is the non-light-emitting region NEA, the pixel electrode 114 may be formed only in a portion (circuit region CA) where the thin film transistor and the pixel electrode 114 are in contact, and the pixel electrode 114 may not be formed in other non-light-emitting regions. In addition, since a predetermined region including the circuit region CA is not the light emitting region EA, the second layer 1132 of the cover layer 113, that is, the plurality of concave portions 141, may not be formed in the predetermined region. In the non-light-emitting region including the circuit region CA, the pixel electrode 114 is not formed in other non-light-emitting regions than the circuit region CA, and the second layer 1132 of the cover layer 113 is not provided in the entire non-light-emitting region including the circuit region CA. Accordingly, in a predetermined region including the circuit region CA, only the bank 115, the light emitting layer 116, and the reflective electrode 117 may be provided in other non-light emitting regions than the circuit region CA. As a result, the light emitting area EA and the circuit area CA of the sub-pixel SP may be asymmetrically formed with reference to the second area A2. In this case, as shown in fig. 2 and 10, the predetermined region including the circuit region CA may refer to a non-light emitting region NEA that includes the circuit region CA of the first subpixel SP1 while being adjacent to the light emitting region EA of the first subpixel SP1 in the second direction (Y-axis direction).

Meanwhile, in fig. 10, the first color filter CF1 of the first sub-pixel SP1 may be formed to extend to the second area A2 adjacent to the first area A1 of the circuit area CA, and thus may be formed according to the equation expressed in the description about fig. 6.

Fig. 11 is a schematic plan view illustrating a plurality of pixels of a display device according to an embodiment of the present disclosure, and fig. 12 is a schematic sectional view taken along a VI-VI' line shown in fig. 11.

Referring to fig. 11 and 12, the plurality of pixels P may include a first pixel P1 and a second pixel P2 adjacent to the first pixel P1 in a second direction (Y-axis direction). The second pixel P2 may include a plurality of sub-pixels SP. The second pixel P2 according to one example may include a fifth subpixel SP5 adjacent to the first subpixel SP1 of the first pixel P1 and emitting red light. The second pixel P2 according to one example may include a sixth subpixel SP6 adjacent to the second subpixel SP2 of the first pixel P1 and emitting white light. The second pixel P2 according to one example may include a seventh subpixel SP7 adjacent to the third subpixel SP3 of the first pixel P1 and emitting blue light. The second pixel P2 according to one example may include an eighth subpixel SP8 adjacent to the fourth subpixel SP4 of the first pixel P1 and emitting green light.

Since the fifth subpixel SP5 emits the same red light as the first subpixel SP1, the fifth subpixel SP5 may include the first color filter CF1 (may also be named as a fifth color filter CF 5) as a red color filter. Accordingly, the display device 100 according to one embodiment of the present disclosure may be provided in a bar shape in which light of the same color is emitted in the second direction (Y-axis direction).

Referring to fig. 11, the first subpixel SP1 may include a circuit area CA in the non-light emitting area NEA. The gate line GL and the sensing line SL may be disposed between the circuit area CA of the first sub-pixel SP1 and the light emitting area EA of the fifth sub-pixel SP5 in the first direction (X-axis direction).

As shown in fig. 11, the first color filter CF1 may not cover the circuit area CA of each of the first and fifth sub-pixels SP1 and SP 5. The second color filter CF2 may not cover the circuit area CA of each of the third and seventh sub-pixels SP3 and SP 7. The third color filter CF3 may not cover the circuit area CA of each of the fourth and eighth sub-pixels SP4 and SP 8. This is because, as described above, when the color filter CF is disposed on the circuit area CA, when a contact hole for connecting the pixel electrode 114 with the thin film transistor of the circuit area CA is formed, the thin film transistor may be contaminated by the color filter CF. Accordingly, as shown in fig. 11, the color filter CF may be formed so as not to cover the circuit area CA of each of the plurality of sub-pixels SP and the periphery of the circuit area CA.

In the display device 100 according to one embodiment of the present disclosure, the color filter CF may be set to cover the other areas except the circuit area CA and the periphery of the circuit area CA in the sub-pixels except the second sub-pixel SP2 and the sixth sub-pixel SP2 which are white sub-pixels. Accordingly, the display device 100 according to one embodiment of the present disclosure may maintain the color and the color viewing angle (color VIEWING ANGLE) of the light emitting region (or the emitting region) of the light reflected by the reflection part 130. In this case, the color viewing angle may mean that the color coordinates are shifted (shift) in the direction in which the color gamut decreases.

Referring to fig. 12, since the color filter is not disposed in the circuit area CA of the first subpixel SP1, the first color filter CF1 of the fifth subpixel SP5 may overlap the gate line GL and the sensing line SL disposed in the first area A1 of the first subpixel SP1 and may not overlap the circuit area CA of the first subpixel SP 1. The circuit area CA of the first subpixel SP1 may refer to an area where the pixel electrode 114 of the first subpixel SP1 contacts the thin film transistor of the first subpixel SP1 through the contact hole. Accordingly, since the thin film transistor of the first subpixel SP1 is not shown in fig. 12, the first color filter CF1 of the fifth subpixel SP5 may be formed only to a region that does not overlap the thin film transistor of the first subpixel SP 1.

As shown in fig. 12, the first color filter CF1 of the fifth subpixel SP5 may be set to cover the reference line RL disposed in the first area A1 of the fifth subpixel SP5 and the sensing line SL and the gate line GL disposed in the first area A1 of the first subpixel SP 1. Accordingly, in a repair process using laser dicing of the sensing line SL and/or the gate line GL to put only defective sub-pixels in a impossible operation state, the first color filter CF1 may block the laser light from reaching the reflective electrode 117. Accordingly, in the display device 100 according to one embodiment of the present disclosure, since the first color filter CF1 of the fifth subpixel SP5 is disposed to overlap the sensing line SL and the gate line GL of the first subpixel SP1, the reflective electrode 117 may be protected from the laser light for the repair process, and thus the lifetime of the reflective electrode 117 may not be reduced.

Meanwhile, as shown in fig. 12, a plurality of concave portions 141 and pixel electrodes 114 for improving light extraction may not be provided in the non-light emitting region NEA in which the sensing line SL and the gate line GL of the first sub-pixel SP1 are provided. Accordingly, only the bank 115, the light emitting layer 116, and the reflective electrode 117 may be disposed in the non-light emitting region NEA in which the sensing line SL and the gate line GL of the first sub-pixel SP1 are disposed. Accordingly, the first region A1 of the fifth subpixel SP5 and the first region A1 of the first subpixel SP1 may be asymmetrically formed in the second direction (Y-axis direction) with reference to the second region A2.

As a result, the display device 100 according to the present disclosure can obtain the following effects.

First, in the display device 100 according to the present disclosure, the reflection portion 130 is provided on the pattern portion 120 in the periphery of the non-light emitting region NEA between the plurality of sub-pixels SP, so that even reflected light can be extracted from the non-light emitting region NEA, whereby the overall light efficiency can be improved.

Second, in the display device 100 according to the present disclosure, due to the reflection portion 130 provided on the pattern portion 120 of the non-light emitting region NEA, light may be extracted even from the non-light emitting region NEA, so that the display device 100 according to the present disclosure may have the same light emitting efficiency or further improved light emitting efficiency even in a low power case, as compared to a display device without the reflection portion, whereby overall power consumption may be reduced.

Third, the display device 100 according to one embodiment of the present disclosure may enable the light emitting element layer E to emit light even in a low power case, thereby improving the lifetime of the light emitting element layer E.

Fourth, in the display device 100 according to the present disclosure, since each of the plurality of sub-pixels SP includes the light extraction part 140 having the plurality of concave parts 141, among the light emitted from the light emitting element layer, the path of the light directed to the adjacent sub-pixel SP may be changed so that the light may be extracted through the reflection part 130, whereby the luminance maintenance and the light extraction efficiency may be further improved.

Fifth, in the display device 100 according to one embodiment of the present disclosure, since at least one line of the plurality of lines 150 disposed in the non-light emitting region NEA of each of the plurality of sub-pixels SP may be set to partially overlap the pattern part 120, among the light emitted from the light emitting element layer, the light directed to the line 150 may be extracted through the line 150 and the reflection part 130, whereby the light extraction efficiency may be maximized.

Sixth, in the display device 100 according to one embodiment of the present disclosure, light emitted from each sub-pixel SP can be prevented from being emitted to adjacent sub-pixels SP due to color filters overlapping each other at boundary portions of the sub-pixels SP, whereby color mixing between the sub-pixels SP can be prevented from occurring.

Seventh, in the display device 100 according to one embodiment of the present disclosure, since the reflection part 130 is provided on the pattern part 120 between the sub-pixels SP for emitting the light of the different colors, the light of the different colors can be more effectively prevented from being emitted to other adjacent sub-pixels SP. Accordingly, the display device 100 according to the present disclosure may prevent color mixing (or color distortion) between the sub-pixels SP for emitting different colors of light, thereby improving color purity.

Eighth, in the display device 100 according to one embodiment of the present disclosure, since the color filter CF of each sub-pixel SP is set to overlap the sensing line SL and the gate line GL between the sub-pixels SP in the second direction (Y-axis direction), the reflective electrode 117 may be protected from the laser light used for the repair process, so that it is possible to avoid a reduction in the lifetime of the light emitting layer 116 due to the damage of the reflective electrode 117.

Fig. 13 is a schematic plan view illustrating a display device according to another embodiment of the present disclosure; fig. 14 is a schematic cross-sectional view taken along line VII-VII' shown in fig. 13.

Referring to fig. 13 and 14, a display device 100 according to another embodiment of the present disclosure is the same as the display device of fig. 1 except for a structural change of the second color filter CF 2. Accordingly, the same reference numerals are given to those elements that are the same as those of fig. 1, and elements that are different from those of fig. 1 will be described below.

In the case of the display device according to fig. 1 described above, the second color filter CF2 as a blue color filter is provided in the third sub-pixel SP3 as a blue sub-pixel. Therefore, in the case of the display device according to fig. 1, only the first color filter CF1, which is a red color filter, is partially disposed between the first subpixel SP1 and the second subpixel SP2, which are red subpixels. Therefore, in the display device according to fig. 1, when the first subpixel SP1 or the second subpixel SP2 emits light, light leakage or color mixing may occur between the first subpixel SP1 and the second subpixel SP 2.

In contrast, in the display device according to fig. 13, the second color filter CF2 may include an extension color filter (extended color filter) CF2-1 that extends from the third subpixel SP3 to the second subpixel SP2 and is disposed to surround the second subpixel SP2 (or the light emitting area EA of the second subpixel SP 2). The extension color filter CF2-1 according to one example may be a portion in which the second color filter CF2 in the third subpixel SP3 extends. The extension color filter CF2-1 may be integrally or separately formed with the second color filter CF2 in the third subpixel SP 3. The second color filter CF2 and the extension color filter CF2-1 according to one example may be blue color filters. Accordingly, in the case of the display device according to fig. 13, since the extension color filter CF2-1 partially overlaps the first color filter CF1 in the non-light emitting region NEA between the first and second sub-pixels SP1 and SP2, light leakage or color mixing between the first and second sub-pixels SP1 and SP2 can be avoided when the first or second sub-pixels SP1 or SP2 emit light.

Further, in the display device according to fig. 13, the extension color filter CF2-1 of the second color filter CF2 is disposed to surround the edge of the second subpixel SP2, so that light leakage corresponding to blue may occur above and/or below the second subpixel SP2 as a white subpixel, whereby the color temperature (or correlated color temperature, CCT) may be improved.

In general, the chromaticity of the light source or reference white (REFERENCE WHITE) may be expressed as the temperature of the closest region on the radiation curve (radiation curve) instead of coordinates on the two-dimensional chromaticity diagram (chromaticity chart). The color temperature is used as a value indicating the degree of approximation to the white color represented. When the color represented in the display device is close to blue, the color temperature is represented as higher; when approaching yellow, the color temperature is indicated as lower. Due to the higher color temperature, a higher quality color is exhibited. In particular, in order for a display device that displays an image by using a light emitting layer that emits white light to exhibit a high quality color, it is preferable to make the color temperature of white higher.

Accordingly, in the display device 100 according to another embodiment of the present disclosure, the extension color filter CF2-1 of the second color filter CF2 is disposed to surround the edge of the second subpixel SP2 (the light emitting area EA of the second subpixel SP 2), so that light leakage corresponding to blue may occur at the edge of the second subpixel SP2, and thus the color temperature may be improved. As a result, in the display device 100 according to another embodiment of the present disclosure, high quality color may be exhibited.

Meanwhile, in the case of a general display device, when the second sub-pixel (or white sub-pixel) is driven, the third sub-pixel (or blue sub-pixel) is also driven to compensate for the decrease in color temperature. However, since the element efficiency (ELEMENT EFFICIENCY) of the blue sub-pixel is lower than that of the other red and green sub-pixels, the power consumption of the blue sub-pixel increases. Therefore, in the case of a general display device, the following problems occur: the lifetime of the light emitting layer of the blue subpixel, which has increased power consumption, is shortened. In the display device 100 according to another embodiment of the present disclosure, however, since the color temperature can be improved by extending the color filter CF2-1 even when only the white subpixel SP2 is driven, the blue subpixel SP3 is not driven or the power consumption of the blue subpixel SP3 is reduced, so that the driving stress (DRIVING STRESS) can be reduced, whereby the overall life can be improved.

Referring back to fig. 13, the extension color filter CF2-1 may be disposed not to overlap the light emitting area EA of the second subpixel SP 2. For example, the extension color filter CF2-1 may be partially disposed in the non-light emitting region NEA surrounding the light emitting region EA of the second subpixel SP 2. Accordingly, when the white subpixel SP2 emits light, since the extension color filter CF2-1 does not interfere with the white light emitted from the light emitting area EA of the white subpixel SP2, degradation of light efficiency of the white light can be avoided.

Referring to fig. 14, in the display device 100 according to another embodiment of the present disclosure, the first data line DL1 may be disposed in the first region A1 of the first subpixel SP1, and the second data line DL2 may be disposed in the second region A2 between the first region A1 of the first subpixel SP1 and the first region A1 of the second subpixel SP 2. In this case, the extension color filter CF2-1 may partially overlap the first data line DL 1. Further, the extension color filter CF2-1 may partially overlap the second data line DL 2. For example, based on fig. 14, the extension color filter CF2-1 may overlap with the remaining portion (or right portion) except for the left portion of the first data line DL 1. Further, based on fig. 14, the extension color filter CF2-1 may overlap with the remaining portion (or left portion) except for the right portion of the second data line DL 2. Further, the extension color filter CF2-1 may overlap with a region between the remaining portion (or right portion) of the first data line DL1 and the remaining portion (or left portion) of the second data line DL 2. Accordingly, some light emitted from the light emitting layer 116 of the first subpixel SP1 may be reflected by the reflective part 130 and then emitted to the outside in the form of reflected light L2 via a region between the remaining part (or right part) of the first data line DL1 and the remaining part (or left part) of the second data line DL 2.

The display device 100 according to another embodiment of the present disclosure may include a first color filter area CFA1. The first color filter area CFA1 according to one example may be an area in which the extension color filter CF2-1 is disposed in the non-light emitting area NEA between the first subpixel SP1 and the second subpixel SP 2.

Referring to fig. 14, the first color filter area CFA1 may include a first side sub-color filter area CFA11, a second side sub-color filter area CFA12, and a third side sub-color filter area CFA13.

The first side sub-color filter area CFA11 may be an area in which the extension color filter CF2-1, the first data line DL1, and the first color filter CF1 overlap each other in the third direction (Z-axis direction). The second side sub-color filter area CFA12 may be an area in which the extension color filter CF2-1 and the first color filter CF1 overlap each other in the third direction (Z-axis direction). The third side sub color filter area CFA13 may be an area in which the extension color filter CF2-1 and the second data line DL2 overlap each other in the third direction (Z-axis direction).

As shown in fig. 14, some of the light emitted from the light emitting layer 116 of the first subpixel SP1 may be refracted by the concave portion 141, reflected by the reflective portion 130, and then emitted to the outside via the second side sub-color filter area CFA 12. Since the second side sub-color filter area CFA12 is an area in which the extension color filter CF2-1 as a blue color filter and the first color filter CF1 as a red color filter overlap each other, light emitted to the outside may have a color with black (blackish).

As a result, the display device 100 according to another embodiment of the present disclosure may be configured to: when the first or second sub-pixel SP1 or SP2 is turned on due to a defect (or a process dispersion variation (process dispersion change), etc.), a color-mixable region is blocked by an overlap between the extension color filter CF2-1 and the first color filter CF 1.

Fig. 15A is an image showing light extraction characteristics of a red subpixel of the display device according to the comparative example; fig. 15B is an image illustrating light extraction characteristics of a red subpixel of a display device according to another embodiment of the present disclosure.

Fig. 15A is an image showing light extraction characteristics of a red subpixel when only a red color filter is disposed between the red subpixel and a white subpixel according to a display device of a comparative example, and fig. 15B is an image showing light extraction efficiency of the red subpixel when a red color filter CF1 and an extension color filter CF2-1 are disposed to overlap each other between the red subpixel (or the first subpixel SP 1) and the white subpixel (or the second subpixel SP 2) according to another embodiment of the present disclosure.

In the display device according to the comparative example, as shown in the image of fig. 15A, since only the red color filter is disposed between the red sub-pixel and the white sub-pixel, red light and/or white light leakage occurs in the first corresponding region CRA1 corresponding to the second side sub-color filter region CFA12 of the display device 100 according to another embodiment of the present disclosure. Therefore, as shown in fig. 15A, in the display device according to the comparative example, when the red sub-pixel emits light, light having a reddish color may be emitted from the first corresponding area CRA 1. On the other hand, in the display device 100 according to another embodiment of the present disclosure, as shown in the image of fig. 15B, since the red color filter CF1 and the extension color filter CF2-1 are disposed to overlap each other in the second side sub-color filter area CFA12, light having a black-colored color may be emitted from the second side sub-color filter area CFA 12.

As a result, in the display device 100 according to another embodiment of the present disclosure, since light having a reddish color can be prevented from being emitted from the second side sub-color filter area CFA12, the color temperature can be improved as compared to the display device according to the comparative example.

Fig. 16 is a schematic cross-sectional view taken along line VIII-VIII' shown in fig. 13.

Referring to fig. 13, the reference line RL may be disposed to be spaced apart from an upper side of the light emitting area EA of the second subpixel SP 2. Specifically, referring to fig. 16, the reference line RL may be disposed in the first region A1 of the second subpixel SP 2. In this case, the extended color filter CF2-1 may partially overlap the reference line RL.

For example, based on fig. 16, the extension color filter CF2-1 may overlap with the rest (or the right) except for the left portion of the reference line RL. Further, based on fig. 16, the extension color filter CF2-1 may partially overlap with a region in which the reference line RL is not provided (e.g., a portion of the first region A1 and a portion of the second region A2). Accordingly, some of the light emitted from the light emitting layer 116 of the second subpixel SP2 may be reflected by the reflective part 130 and then emitted to the outside in the form of reflected light L2 via a region (e.g., a portion of the first region A1 and a portion of the second region A2) in which the reference line RL is not disposed.

The display device 100 according to another embodiment of the present disclosure may include a second color filter area CFA2. The second color filter area CFA2 according to one example may be an area in which the extension color filter CF2-1 is disposed in the non-light emitting area NEA between the second subpixel SP2 and another second subpixel SP2' disposed adjacent to the second subpixel SP2 in the second direction (Y-axis direction).

Referring to fig. 16, the second color filter area CFA2 may include a first upper sub-color filter area CFA21 and a second upper sub-color filter area CFA22.

The first upper sub color filter area CFA21 may be an area in which the extension color filter CF2-1 and the reference line RL overlap each other in the third direction (Z-axis direction). The second upper sub color filter area CFA22 may be an area disposed adjacent to the first upper sub color filter area CFA 21. The extended color filter CF2-1 may be disposed in the second upper sub-color filter area CFA 22.

As shown in fig. 16, some light emitted from the light emitting layer 116 of the second subpixel SP2 may be refracted by the concave portion 141, reflected by the reflective portion 130, and then emitted to the outside via the second upper sub-color filter area CFA 22. Since the second upper sub color filter area CFA22 is an area provided with the extension color filter CF2-1 as a blue color filter, light emitted to the outside may have a bluish color through color conversion.

As a result, in the display device 100 according to another embodiment of the present disclosure, the color temperature when the second sub-pixel SP2 is driven (or turned on) may be improved, and thus the driving stress of the blue sub-pixel (or the third sub-pixel SP 3) may be reduced.

Fig. 17A is an image showing light extraction characteristics of a white subpixel of the display device according to the comparative example; fig. 17B is an image showing light extraction characteristics of a white subpixel of a display device according to another embodiment of the present disclosure.

Fig. 17A is an image showing light extraction characteristics of a white subpixel when a color filter (or a blue color filter) is not disposed above the white subpixel according to the display device of the comparative example, and fig. 17B is an image showing light extraction efficiency of the white subpixel when a blue color filter (or an extended color filter CF 2-1) is disposed above the white subpixel (or the second subpixel SP 2) according to another embodiment of the present disclosure of the display device 100.

In the display device according to the comparative example, as shown in the image of fig. 17A, since the color filter (or blue color filter) is not disposed above the white sub-pixel, white light leakage occurs in the second corresponding region CRA2 corresponding to the second upper sub-color filter region CFA22 of the display device 100 according to another embodiment of the present disclosure. Accordingly, as shown in fig. 17A, in the display device according to the comparative example, when the white sub-pixel emits light, light having a white color may be emitted from the second corresponding area CRA 2. On the other hand, in the display device 100 according to another embodiment of the present disclosure, as shown in the image of fig. 17B, since the extension color filter CF2-1 is disposed in the second upper sub-color filter area CFA22, light having a bluish color may be emitted from the second upper sub-color filter area CFA 22.

As a result, in the display device 100 according to another embodiment of the present disclosure, since light having a bluish color can be emitted from the second upper sub color filter area CFA22, the color temperature can be improved as compared to the display device according to the comparative example.

Fig. 18 is a schematic cross-sectional view illustrating another example of fig. 14.

The display device 100 according to fig. 18 is the same as the display device of fig. 14 except for the arrangement position of the second data lines DL2 and the structural change of the extension color filters CF 2-1. Accordingly, the same reference numerals are given to those elements that are the same as those of fig. 14, and elements that are different from those of fig. 14 will be described below.

In the case of the display device according to fig. 14 described above, the first data line DL1 is disposed in the first region A1 of the first subpixel SP1, and the second data line DL2 is disposed in the second region A2 between the first region A1 of the first subpixel SP1 and the first region A1 of the second subpixel SP 2. Further, the extension color filter CF2-1 partially overlaps the first color filter CF1 and the first data line DL1, and partially overlaps the second data line DL 2.

Accordingly, in the case of the display device according to fig. 14, light emitted from the first subpixel SP1 may be emitted to the outside via the second side sub-color filter area CFA12 located between the first data line DL1 and the second data line DL 2. Since the second side sub-color filter area CFA12 is an area in which the extension color filter CF2-1 as a blue color filter and the first color filter CF1 as a red color filter overlap each other, light emitted to the outside may have a black-colored color.

In contrast, in the case of the display device of fig. 18, the first data line DL1 may be disposed in the first region A1 of the first subpixel SP1, and the second data line DL2 may be disposed in the first region A1 of the second subpixel SP 2. In this case, the extension color filter CF2-1 may partially overlap the first data line DL 1. Further, the extension color filter CF2-1 may partially overlap the second data line DL 2. For example, based on fig. 18, the extension color filter CF2-1 may overlap with the remaining portion (or right portion) except for the left portion of the first data line DL 1. Further, based on fig. 18, the extension color filter CF2-1 may overlap with the remaining portion (or left portion) except for the right portion of the second data line DL 2. Further, the extension color filter CF2-1 may overlap with a region between the remaining portion (or right portion) of the first data line DL1 and the remaining portion (or left portion) of the second data line DL 2. Accordingly, some light emitted from the light emitting layer 116 of the first subpixel SP1 may be reflected by the reflective part 130 and then emitted to the outside in the form of reflected light L2 via a region between the remaining part (or right part) of the first data line DL1 and the remaining part (or left part) of the second data line DL 2.

Another example of the display apparatus 100 according to another embodiment of the present disclosure of fig. 18 may include a first color filter area CFA1. The first color filter area CFA1 according to one example may be an area in which the extension color filter CF2-1 is disposed in the non-light emitting area NEA between the first subpixel SP1 and the second subpixel SP 2.

Referring to fig. 18, the first color filter area CFA1 may include a first side sub-color filter area CFA11, a second side sub-color filter area CFA12, and a third side sub-color filter area CFA13.

As shown in fig. 18, some of the light emitted from the light emitting layer 116 of the first subpixel SP1 may be refracted by the concave portion 141, reflected by the reflective portion 130, and then emitted to the outside via the second side sub-color filter area CFA 12. Since the second side sub-color filter area CFA12 is an area in which the extension color filter CF2-1 as a blue color filter and the first color filter CF1 as a red color filter overlap each other, light emitted to the outside may have a black-colored color.

As a result, in another example of the display device 100 according to another embodiment of the present disclosure, the second side sub-color filter area CFA12 may be wider than the second side sub-color filter area CFA12 in the display device according to fig. 14. Accordingly, in another example of the display apparatus 100 according to another embodiment of the present disclosure, when the first subpixel SP1 or the second subpixel SP2 is turned on, an area for blocking a color mixable region may be set to be wider, whereby color mixing may be prevented to the greatest extent.

Fig. 19A is an image showing light extraction characteristics of another white sub-pixel of the display device according to the comparative example; fig. 19B is an image illustrating light extraction characteristics of another white subpixel of a display device according to another embodiment of the present disclosure.

Fig. 19A is an image showing light extraction characteristics of a white subpixel when only a red color filter is disposed between the red subpixel and the white subpixel according to another example of the display device according to the comparative example, and fig. 19B is an image showing light extraction efficiency of the white subpixel when a red color filter CF1 and an extension color filter CF2-1 are disposed to overlap each other between the red subpixel (or the first subpixel SP 1) and the white subpixel (or the second subpixel SP 2) according to another example of the display device 100 of another embodiment of the present disclosure.

In another example of the display device according to the comparative example, as shown in the image of fig. 19A, since only the red color filter is disposed between the red sub-pixel and the white sub-pixel, red and/or white light leakage occurs in the first corresponding region CRA1 corresponding to the second side sub-color filter region CFA12 of another example of the display device 100 according to another embodiment of the present disclosure. Therefore, as shown in fig. 19A, in another example of the display device according to the comparative example, when the red sub-pixel emits light, light having a reddish color may be emitted from the first corresponding area CRA 1. On the other hand, in another example of the display device 100 according to another embodiment of the present disclosure, as shown in the image of fig. 19B, since the red color filter CF1 and the extension color filter CF2-1 are disposed to overlap each other in the second side sub-color filter area CFA12, light having a black-colored color may be emitted from the second side sub-color filter area CFA 12.

As a result, in another example of the display device 100 according to another embodiment of the present disclosure, since light having a reddish color can be prevented from being emitted from the second side sub-color filter area CFA12, the color temperature can be improved as compared to another example of the display device according to the comparative example.

According to the present disclosure, the following advantageous effects can be obtained.

In the display device according to the present disclosure, the reflection portion is provided in the periphery of the non-light emitting region, so that light can be extracted even from the non-light emitting region, whereby the overall light efficiency can be improved.

In the display device according to the present disclosure, since light can be extracted even from a non-light emitting region, the display device according to the present disclosure can have the same light emitting efficiency or further improved light emitting efficiency even in the case of low power, compared to a display device having no reflective portion, whereby overall power consumption can be reduced.

In the display device according to the present disclosure, each of the plurality of sub-pixels includes a light extraction portion including a plurality of concave portions, so that the luminance maintenance ratio and the light extraction efficiency of light emitted from the light emitting element layer can be further improved.

In the display device according to the present disclosure, since the reflection portion is provided in the non-light emitting region adjacent to the corner of the light emitting region, light can be extracted even from the non-light emitting region adjacent to the corner of the light emitting region, whereby light emitting efficiency can be increased.

In the display device according to the present disclosure, since the reflection line is provided in the non-light emitting region, light extraction efficiency of light emitted from the light emitting element layer can be maximized.

In the display device according to the present disclosure, since the reflection line is provided in the non-light emitting region, color mixing between sub-pixels can be prevented from occurring.

In the display device according to one embodiment of the present disclosure, since the color filter may be provided to cover other areas except the circuit area and the periphery of the circuit area in the sub-pixels except the white sub-pixel, the color and the color viewing angle of the light emitting area (or the emitting area) of the light reflected by the reflection portion may be maintained.

In a display device according to another embodiment of the present disclosure, a blue color filter of a blue subpixel may be disposed to surround an edge of a white subpixel, so that a color temperature of the white subpixel may be improved.

In the display device according to another embodiment of the present disclosure, since the driving stress of the blue subpixel may be relatively reduced by the improvement of the color temperature of the white subpixel, the overall service life may be improved.

It will be apparent to those skilled in the art that the present disclosure described above is not limited to the embodiments and drawings described above, and that various substitutions, modifications and changes may be made in the present disclosure without departing from the spirit or scope of the present disclosure. The scope of the disclosure is therefore defined by the appended claims, and all changes or modifications that come within the meaning, range, and equivalency of the claims are intended to be embraced therein.

Claims

1. A display device, comprising:

a substrate having a plurality of pixels, each of the plurality of pixels having a plurality of sub-pixels;

A pattern portion disposed on the substrate;

a reflection portion on the pattern portion; and

A plurality of lines for driving the plurality of sub-pixels,

Wherein the plurality of sub-pixels include a light emitting region and a non-light emitting region adjacent to the light emitting region, the pattern portion is disposed to surround the light emitting region, and at least a portion of the reflection portion is disposed to surround the light emitting region.

2. The display device according to claim 1, wherein the pattern portion is formed to be concave between the plurality of sub-pixels, and the reflection portion is formed along a contour of the pattern portion formed to be concave between the plurality of sub-pixels.

3. The display device according to claim 1 or 2, wherein the plurality of lines are provided in the non-light-emitting region, and

At least one line of the plurality of lines partially overlaps the pattern.

4. The display device according to claim 3, wherein the non-light-emitting region includes a first region adjacent to the light-emitting region and a second region adjacent to the first region, and the first region is between the second region and the light-emitting region, and

The plurality of lines are disposed in the first region and/or the second region.

5. The display device of claim 4, wherein the second region partially overlaps a boundary between the plurality of subpixels.

6. The display device of claim 4, further comprising a bank in each of the plurality of sub-pixels, wherein the bank is disposed in the first region and is spaced apart from a bank in an adjacent sub-pixel by the second region adjacent to the first region.

7. The display device according to claim 4, wherein the reflection portion includes a flat face provided in the second region and a curved face connected to the flat face.

8. The display device of claim 4, further comprising a color filter between the plurality of lines and the pattern portion,

Wherein the color filter is formed to extend from the light emitting region of each of the plurality of sub-pixels to the second region and partially overlap the line provided in the first region and/or the second region.

9. The display device of claim 4, wherein the plurality of subpixels include:

A first sub-pixel emitting red light;

a second sub-pixel adjacent to the first sub-pixel and emitting white light;

a third sub-pixel adjacent to the second sub-pixel and emitting blue light; and

A fourth sub-pixel adjacent to the third sub-pixel and emitting green light, and

The plurality of lines includes a first data line for driving the first subpixel and a second data line spaced apart from the first data line for driving the second subpixel,

The first data line is arranged in the first region and is a reflection line, and

The second data line is disposed in the second region and is a non-reflective line.

10. The display device according to claim 9, further comprising:

a first color filter disposed in the first subpixel;

a second color filter disposed in the third subpixel; and

A third color filter disposed in the fourth subpixel,

Wherein the plurality of lines includes a reference line disposed between the second subpixel and the third subpixel,

The reference line is arranged to extend from the first region of the second sub-pixel to the second region adjacent to the first region of the third sub-pixel, and

The second color filter extends from the light emitting region of the third subpixel to the second region adjacent to the first region of the second subpixel and partially overlaps the reference line.

11. The display device of claim 10, wherein the plurality of lines includes a third data line for driving the third subpixel, and

The second color filter overlaps the third data line in the first region of the third subpixel and overlaps the third color filter in the second region adjacent to the first region of the third subpixel.

12. The display device of claim 10, wherein the plurality of lines includes a fourth data line for driving the fourth subpixel,

The fourth data line is arranged in the first region of the fourth sub-pixel, and

The third color filter overlaps the fourth data line in the first region of the fourth subpixel and overlaps the second color filter in the second region adjacent to the first region of the fourth subpixel.

13. The display device according to claim 10, wherein the plurality of lines includes a pixel power supply line provided between the first subpixel and another fourth subpixel adjacent to the first subpixel, and

The first color filter overlaps the pixel power supply line in the first region of the first subpixel and overlaps another color filter and the pixel power supply line of the another fourth subpixel in the second region adjacent to the first region of the first subpixel.

14. The display device according to claim 4, further comprising a light-emitting element layer in the plurality of sub-pixels,

Wherein the light emitting element layer includes:

a pixel electrode in the light emitting region;

a light emitting layer on the pixel electrode and the non-light emitting region; and

A reflective electrode on the light emitting layer, and

Wherein the reflective portion is part of the reflective electrode.

15. The display device according to claim 14, further comprising a color filter formed from the light emitting region of each of the plurality of sub-pixels to at least a portion of the second region through the first region,

Wherein a distance L from an end of the color filter in the second region to an end of the light emitting region adjacent to the first region is set to satisfy L.gtoreq.D.tan θc,

Where D is a distance from a lower surface of the light emitting layer to a lower surface of the color filter, and θ _c is a critical angle at which light emitted from the light emitting layer is totally reflected on an upper surface of the substrate.

16. The display device according to claim 14, further comprising a color filter formed from the light emitting region of each of the plurality of sub-pixels to at least a portion of the second region through the first region,

Wherein a distance L from an end of the color filter in the second region to an end of the light emitting region adjacent to the first region is set to satisfy L.gtoreq.Dtan (arcsin (n 1/n 2)),

Where D is a distance from a lower surface of the light emitting layer to a lower surface of the color filter, n1 is a refractive index of the light emitting layer, and n2 is a refractive index of the substrate.

17. The display device of claim 15, wherein the plurality of subpixels include a white subpixel for emitting white light and a color subpixel adjacent to the white subpixel, and

The color filters are color filters of the color sub-pixels.

18. The display device according to claim 4, further comprising a light extraction portion in each of the plurality of sub-pixels, wherein the light extraction portion overlaps the light emitting region and includes a plurality of concave portions,

The light extraction portion is disposed adjacent to the pattern portion, and

The pattern portion includes an inclined surface formed in the first region and a bottom surface extending from the inclined surface and formed up to the second region.

19. The display device of claim 18, wherein the inclined surface of the pattern portion forms an obtuse angle with the bottom surface of the pattern portion.

20. The display device according to claim 1, wherein the pattern portion is provided to be spaced apart from the light emitting region.

21. The display device according to claim 1, wherein the pattern portion has a width decreasing from the reflection portion toward the substrate.

22. The display device of claim 18, further comprising a cover layer on the substrate and a pixel electrode on the cover layer in each of the plurality of sub-pixels,

Wherein the cover layer comprises a first layer comprising a plurality of concave portions and a second layer between the first layer and the pixel electrode, and

The second layer extends to the first region and contacts only a portion of the bottom surface of the pattern portion while covering the inclined surface of the pattern portion.

23. The display device of claim 22, further comprising a bank covering edges of the pixel electrode,

Wherein the bank covers the second layer covering the inclined surface and is in contact with only a part of the bottom surface of the pattern portion.

24. The display device of claim 23, wherein the second layer and the dykes on the bottom surface of the pattern portion are each discontinuous.

25. The display device of claim 10, wherein the plurality of subpixels includes a fifth subpixel adjacent to the first subpixel, the fifth subpixel emitting light of the same color as light emitted by the first subpixel,

The display device further includes a fifth color filter, the same as the first color filter, a gate line, and a sensing line, the fifth color filter being disposed in the fifth subpixel,

The first subpixel includes a circuit area in the non-light emitting area,

The gate line and the sense line are disposed between the circuit region of the first subpixel and the fifth subpixel, and

The fifth color filter overlaps the gate line and the sensing line, and does not overlap the circuit region of the first subpixel.

26. The display device according to claim 9, further comprising:

A first color filter disposed in the first subpixel; and

A second color filter disposed in the third sub-pixel,

Wherein the second color filter includes an extension color filter extending from the third sub-pixel to the second sub-pixel and disposed to surround the second sub-pixel,

The second color filter and the extension color filter are blue color filters.

27. The display device of claim 16, wherein the extended color filter does not overlap with a light emitting region of the second subpixel.

28. The display device of claim 26, wherein the extended color filter partially overlaps the first color filter in a non-light emitting region between the first subpixel and the second subpixel.

29. The display device of claim 26, wherein the plurality of lines includes a first data line for driving the first subpixel and a second data line spaced apart from the first data line for driving the second subpixel,

The first data line is disposed in the first region,

The second data line is disposed in the second region,

The extended color filter partially overlaps the first data line,

The extended color filter partially overlaps the second data line.

30. The display device of claim 29, wherein the extended color filter comprises a first color filter region disposed in a non-light emitting region between the first subpixel and the second subpixel,

The first color filter region includes:

a first side sub-color filter region in which the extended color filter, the first data line, and the first color filter overlap each other;

A second side sub-color filter region in which the extended color filter and the first color filter overlap each other; and

And a third side sub-color filter region in which the extended color filter and the second data line overlap each other.

31. The display device of claim 30, wherein light emitted via the second side sub-color filter region has a blackened color.

32. The display device according to claim 26, wherein the plurality of lines includes a reference line disposed to be spaced apart from an upper side of the light emitting region of the second sub-pixel,

The reference line is disposed in the first region,

The extended color filter partially overlaps the reference line.

33. The display device of claim 32, wherein the extended color filter includes a second color filter region disposed in a non-light emitting region between the second subpixel and another second subpixel disposed adjacent to the second subpixel,

The second color filter region includes:

A first upper sub color filter region in which the extended color filter and the reference line overlap each other; and

A second upper sub-color filter region disposed adjacent to the first upper sub-color filter region.

34. The display device of claim 33, wherein light emitted via the second upper sub-color filter region has a bluish color.

35. The display device of claim 4, wherein the plurality of subpixels comprise:

A first sub-pixel emitting red light;

a second sub-pixel adjacent to the first sub-pixel and emitting white light;

a third sub-pixel adjacent to the second sub-pixel and emitting blue light; and

The first sub-pixel includes a first color filter,

The third sub-pixel includes a second color filter,

The second color filter includes an extension color filter extending from the third sub-pixel to the second sub-pixel and disposed to surround the second sub-pixel,

The second color filter and the extension color filter are blue color filters.

36. The display device of claim 35, wherein the plurality of lines includes a first data line for driving the first subpixel and a second data line spaced apart from the first data line for driving the second subpixel,

The first data line is disposed in a first region of the first subpixel,

The second data line is disposed in the first region of the second subpixel,

The extended color filter partially overlaps the first data line,

The extended color filter partially overlaps the second data line.

37. The display device of claim 36, wherein the extended color filter comprises a first color filter region disposed in a non-light emitting region between the first subpixel and the second subpixel,

The first color filter region includes:

38. The display device of claim 37, wherein light emitted via the second side sub-color filter region has a blackened color.

39. A display device, comprising:

A substrate including a plurality of sub-pixels having a light emitting region and a non-light emitting region adjacent to the light emitting region;

A pattern part formed to be concave on the substrate and surrounding the light emitting region;

a reflection portion on the pattern portion; and

A plurality of lines for driving the plurality of sub-pixels,

Wherein the non-light emitting region comprises a first region adjacent to the light emitting region and a second region adjacent to the first region, and the first region is between the second region and the light emitting region, and

At least one line of the plurality of lines is disposed in the first region and is a reflected line.

40. The display device of claim 39, further comprising a bank in each of the plurality of sub-pixels, wherein the bank is disposed in the first region, and

The second region is between the banks of each of the sub-pixels.

41. The display device of claim 40, wherein the plurality of subpixels includes a first subpixel and a second subpixel disposed adjacent to the first subpixel,

The display device further includes a color filter for the first sub-pixel, the color filter being disposed between the reflection line and the pattern portion, and

The color filter does not overlap the first region of the second subpixel.

42. The display device according to claim 41, wherein the plurality of lines further includes a line provided in the second region, and the color filter partially overlaps the line provided in the second region.

43. The display device of claim 41, wherein the plurality of lines further comprises an entire line formed over the first region and the second region, and

A portion of the color filter overlaps the entire line in the second region.

44. The display device according to claim 40, further comprising a light-emitting element layer in the plurality of sub-pixels,

Wherein the light emitting element layer includes:

a pixel electrode in the light emitting region;

A reflective electrode on the light emitting layer, and

The reflective portion is a portion of the reflective electrode.

45. The display device of claim 44, further comprising a color filter formed from the light emitting region through the first region to at least a portion of the second region,

46. The display device of claim 40, further comprising a light extraction portion in each of the plurality of sub-pixels, wherein the light extraction portion overlaps the light emitting region and comprises a plurality of recessed portions,

The light extraction portion is disposed adjacent to the pattern portion, and

47. The display device of claim 46, further comprising a cover layer on the substrate and a pixel electrode on the cover layer in each of the plurality of sub-pixels,

Wherein the cover layer comprises a first layer and a second layer, the first layer comprises the plurality of concave portions, and the second layer is between the first layer and the pixel electrode, and

48. The display device according to claim 1 or 39, wherein the reflection portion is provided in the non-light-emitting region adjacent to a corner of the light-emitting region.