TWI679789B - Organic light emitting diode display apparatus - Google Patents

Abstract

An organic light emitting diode display device includes a substrate and a pixel structure disposed on the substrate. The pixel structure includes an active element, a first electrode electrically connected to the active element, a bank layer disposed on the first electrode, a light-emitting layer disposed on the first electrode and an opening of the bank layer, and a first light-emitting layer disposed on the light-emitting layer. Two electrodes. The first electrode has a first region and a plurality of protrusions disposed outside the first region. The opening of the bank layer overlaps the first region of the first electrode and the plurality of protrusions.

Description

Organic light emitting diode display device

The present invention relates to a display device, and more particularly, to an organic light emitting diode display device.

With the advancement of technology, in the process of manufacturing organic light emitting diode display devices, an inkjet printing process (Ink Jet Printing; IJP) can be used to form a light emitting layer. The inkjet printing process injects droplets into the opening defined by the bank layer to form a light-emitting layer. However, the thickness of the light-emitting layer formed in the opening of the bank layer is uneven, which affects the display quality. Specifically, the film thickness of the light-emitting layer around the opening of the bank layer is much larger than the film thickness of the light-emitting layer inside the opening of the bank layer. When displaying a screen, the area around the opening corresponding to the bank layer and the opening of the bank layer are caused. The color of the internal area is extremely different, which affects the optical performance of the organic light emitting diode display device.

The invention provides an organic light emitting diode display device with excellent optical performance.

The organic light emitting diode display device of the present invention includes a substrate and a plurality of pixel structures disposed on the substrate. At least one of the plurality of pixel structures includes an active element, a first electrode, a bank layer, a light emitting layer, and a second electrode. The first electrode is electrically connected to the active device, and has a first region and a plurality of protrusions disposed outside the first region. The bank layer is disposed on the first electrode and has an opening and a sidewall defining the opening. The opening of the bank layer overlaps the first region of the first electrode and the plurality of protrusions. The light emitting layer is disposed on the first electrode and the opening of the bank layer. The light-emitting layer includes a first portion and a second portion. The first portion is disposed on the first region of the first electrode. The second portion of the light-emitting layer is disposed between the plurality of protrusions of the first electrode and the sidewall of the bank layer. The film thickness of the second portion is larger than the film thickness of the first portion of the light-emitting layer. The second electrode is disposed on the light emitting layer.

Based on the above, the first electrode of the organic light emitting diode display device according to an embodiment of the present invention has a plurality of protrusions. Micro gaps are formed between the plurality of protrusions of the first electrode and the sidewall of the bank layer. Through the capillary action of the micro gaps, more droplets used to form the light-emitting layer are retained in the micro-gap, thereby suppressing light emission. The thickness of the layer near the side wall of the bank layer. In this way, the light emitting layer can have a relatively uniform film thickness, which helps to improve the optical performance of the organic light emitting diode display device.

In order to make the above features and advantages of the present invention more comprehensible, embodiments are hereinafter described in detail with reference to the accompanying drawings.

In the drawings, the thicknesses of layers, films, panels, regions, etc. are exaggerated for clarity. Throughout the description, the same reference numerals denote the same elements. It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element, or Intermediate elements may also be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements present. As used herein, "connected" may refer to a physical and / or electrical connection. Furthermore, "electrically connected" or "coupled" can mean that there are other components between the two components.

As used herein, "about," "approximately," or "substantially" includes the stated value and an average value within an acceptable deviation range of a particular value determined by one of ordinary skill in the art, taking into account the measurements and A specific number of measurement-related errors (ie, limitations of the measurement system). For example, "about" can mean within one or more standard deviations of the stated value, or within ± 30%, ± 20%, ± 10%, ± 5%. Furthermore, the terms "about", "approximately" or "substantially" used herein may select a more acceptable range of deviations or standard deviations based on optical properties, etching properties, or other properties, and all properties can be applied without one standard deviation. .

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted to have meanings consistent with their meanings in the context of the related art and the present invention, and will not be interpreted as idealized or excessive Formal meaning unless explicitly defined as such in this article.

Exemplary embodiments are described herein with reference to cross-sectional views that are schematic views of idealized embodiments. Accordingly, variations in the shapes of the illustrations as a result, for example, of manufacturing techniques and / or tolerances, are to be expected. Therefore, the embodiments described herein should not be construed as limited to the specific shape of the area as shown herein, but include shape deviations caused by, for example, manufacturing. For example, a region shown or described as flat may generally have rough and / or non-linear characteristics. Furthermore, the acute angles shown may be round. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the precise shape of a region and are not intended to limit the scope of the claims.

Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts.

FIG. 1 is a schematic top view of an organic light emitting diode display device according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of an organic light emitting diode display device drawn according to a section line A-A 'of FIG. 1. FIG. FIG. 3 is a schematic cross-sectional view of the organic light emitting diode display device drawn according to the section line B-B 'of FIG. 1. For clarity, the light emitting layer 126 and the second electrode 125 of FIGS. 2 and 3 are omitted in FIG. 1.

Please refer to FIGS. 1, 2 and 3. The organic light emitting diode display device 10 includes a substrate 110 and a plurality of pixel structures 120 disposed on the substrate 110. A pixel structure 120 is shown in FIG. 1, FIG. 2, and FIG. 3 as an example. Those skilled in the art should be able to implement the organic light-emitting diode display device 10 according to this specification and the drawings, and will not be drawn one by one here. Multiple pixel structure 120.

In this embodiment, the substrate 110 may be a flexible substrate, a rigid substrate, or a combination thereof. For example, the material of the flexible substrate may be polyimide (PI), polyethylene terephthalate (PET), or other suitable materials. The material of the rigid substrate may be glass, quartz, or other materials. Suitable materials, but the invention is not limited thereto.

The pixel structure 120 includes an active device 121 and a first electrode 123 electrically connected to the active device 121. For example, in this embodiment, the active device 121 includes a thin film transistor, and the first electrode 123 is electrically connected to the drain of the thin film transistor. In this embodiment, the pixel structure 120 may optionally further include an insulating layer 122 disposed between the first electrode 123 and the substrate 110. The insulating layer 122 covers the active device 121. The first electrode 123 is disposed on the insulating layer 121. The insulating layer 122 has a contact window 122a, and the first electrode 123 can be electrically connected to the active device 121 through the contact window 122a. However, the present invention is not limited to this. According to other embodiments, the first electrode 123 may also be electrically connected to the active device 121 by other suitable methods.

The first electrode 123 has a first region R1 and a plurality of protrusions 123b disposed outside the first region R1. For example, in this embodiment, the first electrode 123 includes a flat portion 123a provided on the insulating layer 122 and a plurality of protrusions 123b provided on the flat portion 123a. The first region R1 of the first electrode 123 may be It is a part of the flat portion 123a. In this embodiment, the flat portion 123a and the plurality of protrusions 123b can be selectively formed using a half-tone mask. That is, in this embodiment, the flat portion 123a and the plurality of protrusions 123b may be selectively integrally formed, and the material of the flat portion 123a and the plurality of protrusions 123b may be the same conductive material. However, the present invention is not limited to this. According to other embodiments, the flat portions 123a and the plurality of protrusions 123b may be respectively formed by using a plurality of different photomasks. That is, in other embodiments, the flat portion 123a and the plurality of protrusions 123b of the first electrode 123 may not be integrally formed, and the material of the flat portion 123a and the plurality of protrusions 123b may be the same conductive material. Or dissimilar multiple conductive materials.

In this embodiment, the vertical projections of the plurality of protrusions 123 b on the substrate 110 may be a plurality of oval shapes. However, the present invention is not limited to this. According to other embodiments, the vertical projection of the protrusion 123b on the substrate 110 may also have other appropriate shapes, which will be described below in conjunction with other drawings by way of example.

The pixel structure 120 further includes a bank layer 124 disposed on the first electrode 123. The bank layer 124 has an opening 124a and a side wall 124b defining the opening 124a. The opening 124 a of the bank layer 124 overlaps the first region R1 of the first electrode 123 and the plurality of protrusions 123 b of the first electrode 123. In this embodiment, the sidewall 124b of the bank layer 124 and the surface 123c of the first electrode 123 have an interface edge L (labeled in FIG. 1), and the plurality of protrusions 123b of the first electrode 123 are spaced from each other and along the interface edge L Settings. That is, the plurality of protrusions 123b of the first electrode 123 are disposed on the periphery of the opening 124a, but are not disposed on the middle of the opening 124a. For example, in this embodiment, the material of the bank layer 124 may be a photoresist or other suitable materials, but the invention is not limited thereto.

The opening 124a of the bank layer 124 has a first width W1 in a first direction x, the opening 124a of the bank layer 124 has a second width W2 in a second direction y, and the first direction x intersects the second direction y. In this embodiment, the first width W1 and the second width W2 may be selectively unequal. In this embodiment, the opening 124a of the bank layer 124 may be an oval opening, the short axis of the oval opening is located in the first direction x, and the long axis of the oval opening is located in the second direction y. However, the present invention is not limited to this. According to other embodiments, the opening 124a of the bank layer 124 may also have other suitable shapes.

In this embodiment, the sidewall 124b of the bank layer 124 may include a first portion 124b-1 and a second portion 124b-2, the first portion 124b-1 of the sidewall 124b is located in the first direction x, and the second portion 124b of the sidewall 124b -2 is in the second direction y. For example, in this embodiment, the first portion 124b-1 of the side wall 124b and the surface 123c of the first electrode 123 have a first angle α, and the second portion 124b-2 of the side wall 124b and the surface 123c of the first electrode 123 have The second included angle β, and the first included angle α is greater than the second included angle β. That is, the first portion 124b-1 of the sidewall 124b of the bank layer 124 is relatively steep, and the second portion 124b-2 of the sidewall 124b of the bank layer 124 is relatively slow, but the invention is not limited thereto.

The plurality of protrusions 123b are separated from the sidewall 124b of the bank layer 124 by an appropriate distance d1, d2. For example, in this embodiment, the plurality of protrusions 123b includes a plurality of protrusions 123b-1 adjacent to the first portion 124b-1 of the side wall 124b and a plurality of protrusions 123b-1 adjacent to the second portion 124b-2 of the side wall 124b.个 raised 123b-2. A protrusion 123b-1 is separated from the first portion 124b-1 of the side wall 124b by a first distance d1. A protrusion 123b-2 is separated from the second portion 124b-2 of the side wall 124b by a second distance d2. In this embodiment, the first distance d1 may be substantially equal to the second distance d2. However, the present invention is not limited to this. According to other embodiments, the first distance d1 may not be equal to the second distance d2, which will be described below in conjunction with other drawings by way of example.

The pixel structure 120 further includes a light emitting layer 126 disposed on the first electrode 123 and the opening 124 a of the bank layer 124. The light emitting layer 126 includes a first portion 126-1 and a second portion 126-2. The first portion 126-1 of the light emitting layer 126 is disposed on the first region R1 of the first electrode 123. That is, the first portion 126-1 of the light emitting layer 126 is disposed on the flat portion 123 a of the first electrode 123. The second portion 126-2 of the light emitting layer 126 is disposed between the plurality of protrusions 123 b of the first electrode 123 and the sidewall 124 b of the bank layer 124. In particular, the film thickness T2 of the second portion 126-2 of the light emitting layer 126 is larger than the film thickness T1 of the first portion 126-1 of the light emitting layer 126. That is, the light emitting layer 126 is formed by an inkjet printing method.

The pixel structure 120 further includes a second electrode 125 disposed on the light emitting layer 126. The light emitting layer 126 may also be referred to as an organic electroluminescent layer, and the potential difference between the first electrode 123 and the second electrode 125 can drive the organic electroluminescent layer (ie, the light emitting layer 126) to emit light. For example, in this embodiment, the organic light emitting diode display device 10 may be a top emission type, and the first electrode 123 may be a reflective electrode, and the second electrode 125 may be a light transmitting electrode. . However, the present invention is not limited to this. According to another embodiment, the organic light emitting diode display device 10 may alternatively be a bottom emission type, and the first electrode 123 may be a light transmitting electrode and the second electrode. 125 may be a reflective electrode; according to another embodiment, the organic light emitting diode display device 10 may also be a double-sided light emitting type, and the first electrode 123 and the second electrode 125 may both be transparent electrodes.

It is worth mentioning that, through the plurality of protrusions 123b of the first electrode 123, the light emitting layer 126 can have a relatively uniform film thickness, which is helpful to the optical performance of the organic light emitting diode display device 10. In detail, there is a slight gap between the plurality of protrusions 123b of the first electrode 123 and the side wall 124b of the bank layer 124; when the light emitting layer 126 is formed by the inkjet printing method, the protrusions 123b and the bank layer 124 The micro-gap between the side walls 124b of the substrate can use a capillary effect to hold a larger amount of droplets (ie, the material forming the light-emitting layer 126) within the micro-gap, thereby suppressing the film of the second portion 126-2 of the light-emitting layer 126. Thick T2. In this way, the difference between the film thickness T2 of the second portion 126-2 of the light-emitting layer 126 and the film thickness T1 of the first portion 126-1 of the light-emitting layer 126 is reduced, so that the overall film thickness of the light-emitting layer 126 is more uniform.

FIG. 4 is a schematic top view of an organic light emitting diode display device according to an embodiment of the present invention. For clarity, the light emitting layer and the second electrode of the organic light emitting diode display device 10A are omitted in FIG. 4.

The organic light emitting diode display device 10A of FIG. 4 is similar to the organic light emitting diode display device 10 of FIG. 1. The difference between the two is that the protrusion 123 bA of the organic light emitting diode display device 10A of FIG. 4 is the same as that of FIG. 1. The protrusions 123b of the organic light emitting diode display device 10 are different. Please refer to FIG. 1 and FIG. 4. Specifically, the vertical projection of the plurality of protrusions 123 b of FIG. 1 on the substrate 110 is a plurality of ellipses, and the vertical projection of the plurality of protrusions 123 bA of FIG. 4 on the substrate 110 is Multiple circles.

FIG. 5 is a schematic top view of an organic light emitting diode display device according to an embodiment of the present invention. For clarity, FIG. 5 omits the light emitting layer and the second electrode of the organic light emitting diode display device 10B.

The organic light emitting diode display device 10B of FIG. 5 is similar to the organic light emitting diode display device 10 of FIG. 1. The difference between the two is that the protrusion 123 bB of the organic light emitting diode display device 10B of FIG. 5 is the same as that of FIG. 1. The protrusions 123b of the organic light emitting diode display device 10 are different. Please refer to FIGS. 1 and 5. Specifically, the vertical projection of the plurality of protrusions 123 b on FIG. 1 on the substrate 110 is a plurality of ellipses, and the vertical projection of the plurality of protrusions 123 bB on FIG. 5 on the substrate 110 is Multiple rectangles.

FIG. 6 is a schematic top view of an organic light emitting diode display device according to an embodiment of the present invention. For clarity, FIG. 6 omits the light emitting layer and the second electrode of the organic light emitting diode display device 10C.

The organic light emitting diode display device 10C of FIG. 6 is similar to the organic light emitting diode display device 10 of FIG. 1. The difference between the two is that the protrusion 123 bC of the organic light emitting diode display device 10C of FIG. 6 is the same as that of FIG. 1. The protrusions 123b of the organic light emitting diode display device 10 are different. Please refer to FIG. 1 and FIG. 6. Specifically, the vertical projection of the plurality of protrusions 123 b of FIG. 1 on the substrate 110 is a plurality of ellipses, and the vertical projection of the plurality of protrusions 123 bC of FIG. 6 on the substrate 110 is Multiple squares.

FIG. 7 is a schematic top view of an organic light emitting diode display device according to an embodiment of the present invention. For clarity, FIG. 7 omits the light emitting layer and the second electrode of the organic light emitting diode display device 10D.

The organic light emitting diode display device 10D of FIG. 7 is similar to the organic light emitting diode display device 10 of FIG. 1. The difference between the two is that the protrusion 123 bD of the organic light emitting diode display device 10D of FIG. 7 is the same as that of FIG. 1. The protrusions 123b of the organic light emitting diode display device 10 are different. Please refer to FIG. 1 and FIG. 7. Specifically, the vertical projection of the plurality of protrusions 123b of FIG. 1 on the substrate 110 is a plurality of ovals, and the vertical projection of the plurality of protrusions 123bD of FIG. 7 on the substrate 110 is Multiple diamonds.

FIG. 8 is a schematic top view of an organic light emitting diode display device according to an embodiment of the present invention. FIG. 9 is a schematic cross-sectional view of an organic light emitting diode display device drawn according to a section line A-A 'of FIG. 8. FIG. 10 is a schematic cross-sectional view of the organic light emitting diode display device drawn according to the section line B-B 'of FIG. 8. For clarity, the light emitting layer 126 and the second electrode 125 of FIGS. 9 and 10 are omitted in FIG. 8.

The organic light emitting diode display device 10E of FIGS. 8, 9 and 10 is similar to the organic light emitting diode display device 10 of FIGS. 1, 2 and 3. The difference between the two is that the organic light emitting diode display device The second distance d2 of 10D is smaller than the first distance d1. That is, the distance between the second portion 124b-2 of the side wall 126b of the steeper bank layer 124 and the protrusion 123b is longer, and the first portion 124b-1 of the side wall 126b of the slower bank layer 124 and the protrusion The distance between 123b is shorter. Since the distance d2 between the protrusion 123b and the second portion 124b-2 of the side wall 124b is short, even if the second portion 124b-2 of the side wall 124b is slower, the protrusion 123b and the second portion 124b-2 of the side wall 124b can still be formed. The micro-gap having a good capillary effect further improves the uniformity of the film thickness of the light-emitting layer 126 and improves the optical performance of the organic light-emitting diode display device 10E.

FIG. 11 is a schematic top view of an organic light emitting diode display device according to an embodiment of the present invention. FIG. 12 is a schematic cross-sectional view of an organic light emitting diode display device drawn according to a section line A-A 'of FIG. 11. FIG. 13 is a schematic cross-sectional view of the organic light emitting diode display device drawn according to the section line B-B 'of FIG. 11. For clarity, the light emitting layer 126 and the second electrode 125 of FIGS. 12 and 13 are omitted in FIG. 11.

The organic light emitting diode display device 10F of FIGS. 11, 12, and 13 is similar to the organic light emitting diode display device 10 of FIGS. 1, 2, and 3. The difference between the two is that in FIG. 11, FIG. 12, and FIG. In the embodiment of FIG. 13, one of the plurality of protrusions 123b adjacent to the first portion 126b-1 of the side wall 126b has a first height h1, and the plurality of protrusions 123b adjacent to the second portion 126b-2 of the side wall 126b. The other has a second height h2, and the second height h2 is greater than the first height h1. That is, the protrusion 123b of the second portion 124b-2 adjacent to the side wall 126b of the slower bank layer 124 has a higher height h2. In this way, even if the second portion 124b-2 of the side wall 126b is slower, the protrusion 123b having a higher height h2 and the second portion 124b-2 of the side wall 126b can still form a micro gap with a good capillary effect, thereby improving The uniformity of the film thickness of the light emitting layer 126 improves the optical performance of the organic light emitting diode display device 10F.

FIG. 14 is a schematic top view of an organic light emitting diode display device according to an embodiment of the present invention. FIG. 15 is a schematic cross-sectional view of an organic light emitting diode display device drawn according to a section line A-A 'of FIG. 14. FIG. 16 is a schematic cross-sectional view of an organic light emitting diode display device drawn according to a section line B-B 'of FIG. 14. For clarity, the light emitting layer 126 and the second electrode 125 of FIGS. 15 and 16 are omitted in FIG. 14.

The organic light emitting diode display device 10G of FIGS. 14, 15, and 16 is similar to the organic light emitting diode display device 10 of FIGS. 1, 2, and 3. The difference between the two is that in FIG. 14, FIG. 15, and FIG. In the embodiment of FIG. 16, the second distance d2 of the organic light emitting diode display device 10F is smaller than the first distance d1; one of the plurality of protrusions 123b adjacent to the first portion 126b-1 of the side wall 126b has a first height h1. Another one of the plurality of protrusions 123b adjacent to the second portion 126b-2 of the side wall 126b has a second height h2, and the second height h2 is greater than the first height h1. The organic light emitting diode display device 10G has the advantages of the aforementioned organic light emitting diode display device 10E and the organic light emitting diode display device 10F, and will not be repeated here.

FIG. 17 is a schematic top view of an organic light emitting diode display device according to an embodiment of the present invention. FIG. 18 is a schematic cross-sectional view of an organic light emitting diode display device drawn according to a section line A-A 'of FIG. 17. For clarity, FIG. 17 omits the light emitting layer 126 and the second electrode 125 of FIG. 18.

In the embodiment of FIGS. 17 and 18, the organic light emitting diode display device 10H includes a first pixel structure 120-1 and a second pixel respectively for emitting a first color light, a second color light, and a third color light. Structure 120-2 and the third pixel structure 120-3. In this embodiment, the first color light, the second color light, and the third color light may be blue light, green light, and red light, but the present invention is not limited thereto.

In particular, the structures of the first pixel structure 120-1, the second pixel structure 120-2, and the third pixel structure 120-3 are not exactly the same. Specifically, the plurality of protrusions 123b of the first pixel structure 120-1 are arranged at a first pitch P1, the plurality of protrusions 123b of the second pixel structure 120-1 are arranged at a second pitch P2, and the third picture The plurality of protrusions 123b of the element structure 120-3 are arranged at a third pitch P3. In this embodiment, the first pitch P1 is larger than the second pitch P2, and the second pitch P2 is larger than the third pitch P3. For example, the first pitch P1 may be 2 μm, the second pitch P2 may be 1.5 μm, and the third pitch P3 may be 1 μm, but the present invention is not limited thereto.

It is worth mentioning that, in this embodiment, the material of the light emitting layer 126 of the first pixel structure 120-1, the material of the light emitting layer 126 of the second pixel structure 120-2, and the third pixel structure 120-3 The materials of the light emitting layers 126 are different from each other. For example, the droplet concentration of the light-emitting layer 126 used to form the third pixel structure 120-3 is greater than the droplet concentration of the light-emitting layer 126 used to form the second pixel structure 120-2 to form a second picture. The droplet concentration of the light emitting layer 126 of the pixel structure 120-2 is greater than the droplet concentration of the light emitting layer 126 used to form the first pixel structure 120-1. Although the concentrations of various liquid droplets used to form the light emitting layer 126 of the first pixel structure 120-1, the light emitting layer 126 of the second pixel structure 120-2, and the light emitting layer 126 of the third pixel structure 120-3 are different, However, through the above setting of P1> P2> P3, the film thickness uniformity of the light emitting layer 126 of the first pixel structure 120-1, the film thickness uniformity of the light emitting layer 126 of the second pixel structure 120-2, and the third The uniform film thickness performance of the light emitting layer 126 of the pixel structure 120-3 is relatively close, which helps to improve the optical performance of the organic light emitting diode display device 10H.

Please refer to FIGS. 17 and 18. In this embodiment, a distance d1-1 between a protrusion 123 b of the first pixel structure 120-1 and a sidewall 124 b of the bank layer 124 is greater than that of a second pixel structure 120-2. The distance d1-2 between the protrusion 123b and the sidewall 124b of the bank layer 124. Distance d1-2 between a protrusion 123b of the second pixel structure 120-2 and the sidewall 124b of the bank layer 124 and distance d1- between a protrusion 123b of the third pixel structure 120-3 and the sidewall 124b of the bank layer 124 3 may optionally be the same. For example, the distance d1-1 may be 1.5 μm, the distance d1-2 and the distance d1-3 may be 1 μm, but the present invention is not limited thereto.

Similarly, since the distance d1-1 is greater than the distance d1-2, even if the droplet concentration of the light-emitting layer 126 used to form the first pixel structure 120-1 is smaller than the light-emitting layer used to form the second pixel structure 120-2 The droplet concentration of 126, the uniformity of the film thickness of the light-emitting layer 126 of the first pixel structure 120-1 is close to the uniformity of the film thickness of the light-emitting layer 126 of the second pixel structure 120-2, which helps to improve organic light Optical performance of the diode display device 10H.

Referring to FIG. 18, a protrusion 123b of the first pixel structure 120-1 has a first height h1-1, a protrusion 123b of the second pixel structure 120-2 has a second height h1-2, and a third picture One protrusion 123b of the element structure 120-3 has a third height h1-3. In this embodiment, the third height h1-3 may be greater than the second height h1-2, and the second height h1-2 may be greater than the first height h1-1, but the invention is not limited thereto.

Similarly, since the third height h1-3 is greater than the second height h1-2, and the second height h1-2 is greater than the first height h1-1, even the light emitting layer 126 used to form the first pixel structure 120-1 The droplet concentration, the droplet concentration of the light-emitting layer 126 used to form the second pixel structure 120-2, and the droplet concentration of the light-emitting layer 126 used to form the third pixel structure 120-3 are different from each other. Film thickness uniformity of the light-emitting layer 126 of the pixel structure 120-1, film thickness uniformity of the light-emitting layer 126 of the second pixel structure 120-2, and film uniformity of the light-emitting layer 126 of the third pixel structure 120-3 The closeness helps to improve the optical performance of the organic light emitting diode display device 10H.

FIG. 19 is a schematic top view of an organic light emitting diode display device according to an embodiment of the present invention. For clarity, FIG. 19 omits the light emitting layer and the second electrode of the organic light emitting diode display device 10I.

The organic light emitting diode display device 10I of FIG. 19 is similar to the organic light emitting diode display device 10 of FIG. 1. The difference between the two is that the arrangement of the protrusions 123b of the organic light emitting diode display device 10I is the same as that of the organic light emitting diode display device 10I. The arrangement of the protrusions 123b of the polar display device 10 is different. Specifically, the plurality of protrusions 123b of the organic light emitting diode display device 10I includes a first protrusion string S1 and a second protrusion string S2, wherein the first protrusion string S1 is located on the side wall 124b of the bank layer 124 and the second protrusion string S2. Between raised strings S2. That is, in the embodiment of FIG. 19, the plurality of protrusions 123 b of the organic light emitting diode display device 10I may be arranged in multiple circles along the boundary edge L.

FIG. 20 is a schematic top view of an organic light emitting diode display device according to an embodiment of the present invention. For clarity, the light-emitting layer and the second electrode of the organic light-emitting diode display device 10J are omitted in FIG. 20.

The organic light emitting diode display device 10I of FIG. 20 is similar to the organic light emitting diode display device 10 of FIG. 1. The difference between the two is that all the protrusions 123 b of the organic light emitting diode display device 10 are substantially the same, and A part of the plurality of protrusions 123b of the light emitting diode display device 10I is different from another part of the plurality of protrusions 123b of the organic light emitting diode display device 10I. Specifically, in the embodiment of FIG. 20, a vertical projection area of a protrusion 123 b-1 adjacent to the first portion 124 b-1 of the side wall 124 b on the substrate 110 may be selectively larger than that of the first portion 124 b-1 adjacent to the side wall 124 b. The vertical projection area of another protrusion 123b-2 of the two parts 124b-2 on the substrate 110.

FIG. 21 is a schematic top view of an organic light emitting diode display device according to an embodiment of the present invention. For clarity, FIG. 21 omits the light emitting layer and the second electrode of the organic light emitting diode display device 10K.

The organic light emitting diode display device 10K of FIG. 21 is similar to the organic light emitting diode display device 10J of FIG. 20, and the differences between the two are as follows. In the embodiment of FIG. 21, the plurality of protrusions 123b-2 adjacent to the second portion 124b-2 of the side wall 124b are arranged into a third protrusion string S3 and a fourth protrusion string S4, wherein the third protrusion string S3 is located between the second portion 124b-2 of the side wall 124b and the fourth protruding string S4. That is, in the embodiment of FIG. 21, the plurality of protrusions 123b-2 of the second portion 124b-2 of the organic light emitting diode display device 10K near the side wall 124b may be arranged in multiple rows.

22 is a schematic top view of an organic light emitting diode display device according to an embodiment of the present invention. For clarity, FIG. 22 omits the light emitting layer and the second electrode of the organic light emitting diode display device 10L.

The organic light emitting diode display device 10L of FIG. 22 is similar to the organic light emitting diode display device 10K of FIG. 21, and the differences between the two are as follows. In the embodiment of FIG. 22, the plurality of protrusions 123b-1 adjacent to the first portion 124b-1 of the side wall 124b are arranged in a fifth protrusion string S5 and a sixth protrusion string S6, wherein the fifth protrusion string S5 It is located between the sixth protruding string S6 and the first portion 124b-1 of the side wall 124b. That is, in the embodiment of FIG. 22, the plurality of protrusions 123b of the first portion 124b-1 of the organic light emitting diode display device 10L near the side wall 124b may also be arranged in multiple rows.

In addition, in the embodiment of FIG. 22, a vertical projection area of one protrusion 123b of the third protrusion string S3 on the substrate 110 may be selectively smaller than that of one protrusion 123b of the fourth protrusion string S4 on the substrate 110. In the vertical projection area, the vertical projection area of one projection 123b of the fifth projection string S5 on the substrate 110 may be selectively smaller than the vertical projection area of one projection 123b of the sixth projection string S6 on the substrate 110. That is, in the embodiment of FIG. 22, the vertical projection area of the protrusion 123b on the substrate 110 may increase as it moves away from the side wall 124b, but the invention is not limited thereto.

FIG. 23 is a schematic top view of an organic light emitting diode display device according to an embodiment of the present invention. FIG. 24 is a schematic cross-sectional view of an organic light emitting diode display device drawn according to a section line A-A 'of FIG. 23. For clarity, FIG. 23 omits the light emitting layer 126 and the second electrode 125 of FIG. 24.

The organic light emitting diode display device 10M of FIGS. 23 and 24 is similar to the organic light emitting diode display device 10 of FIGS. 1 and 2. The difference between the two is that the insulating layer 122 of the organic light emitting diode display device 10M has a convex shape. Since the first electrode 123 is disposed on the insulating layer 122, the first electrode 123 has a plurality of protrusions 123b provided corresponding to the plurality of protrusions 122b of the insulating layer 122, respectively. In this embodiment, the plurality of protrusions 123b of the first electrode 123 overlap with the plurality of protrusions 122b of the insulating layer 122, respectively.

The insulating layer 122 having a plurality of protrusions 122b and the first electrode 123 on the insulating layer 122 of the organic light emitting diode display device 10M may be used to replace the organic light emitting diode display device 10A of any of the foregoing embodiments. 10B, 10C, 10D, 10E, 10F, 10G, 10H, 10I, 10J, 10K, or 10L of the insulating layer 122 and the first electrode 123. The organic light emitting diode display device constructed in this alternative manner is also within the scope of the present invention.

In summary, an organic light emitting diode display device according to an embodiment of the present invention includes a substrate and a plurality of pixel structures disposed on the substrate. At least one of the plurality of pixel structures includes an active element, a first electrode electrically connected to the active element, a bank layer provided on the first electrode and having an opening, and a light emitting layer provided on the first electrode and the opening of the bank layer. And a second electrode disposed on the light emitting layer. In particular, the bank layer has a sidewall defining an opening, and the first electrode has a plurality of protrusions near the sidewall of the bank layer. The plurality of protrusions of the first electrode form a micro-gap with the sidewall of the bank layer. Through the capillary action of the micro-gap, more droplets used to form the light-emitting layer are retained in the micro-gap, thereby suppressing The film thickness of a part of the light emitting layer near the side wall of the bank layer. In this way, the light emitting layer can have a relatively uniform film thickness, which helps to improve the optical performance of the organic light emitting diode display device.

Although the present invention has been disclosed as above with the examples, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some modifications and retouching without departing from the spirit and scope of the present invention. The protection scope of the present invention shall be determined by the scope of the attached patent application.

10.10A ～ 10M‧‧‧Organic light-emitting diode display device

110‧‧‧ substrate

120, 120-1, 120-2, 120-3‧‧‧ pixel structure

121‧‧‧active components

122‧‧‧ Insulation

122a‧‧‧contact window

122b‧‧‧ raised

123‧‧‧first electrode

123a‧‧‧ flat

123b, 123b-1, 123b-2, 123bA ～ 123bD‧‧‧ raised

123c‧‧‧ surface

124‧‧‧ Embankment

124a‧‧‧ opening

124b‧‧‧ sidewall

124b-1‧‧‧ Part I

124b-2‧‧‧ Part Two

125‧‧‧Second electrode

126‧‧‧Light-emitting layer

126-1‧‧‧ Part I

126-2‧‧‧ Part Two

A-A ’, B-B’‧‧‧ hatching

d1, d1-1, d1-2, d1-3, d2‧‧‧ distance

h1, h1-1, h1-2, h1-3, h2‧‧‧ height

L‧‧‧ Junction

P1, P2, P3 ‧‧‧ pitch

R1‧‧‧ District 1

S1, S2, S3, S4, S5, S6‧‧‧ raised string

T1, T2‧‧‧‧ film thickness

W1, W2‧‧‧Width

x, y‧‧‧ directions

α, β‧‧‧ angle

FIG. 1 is a schematic top view of an organic light emitting diode display device according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of an organic light emitting diode display device drawn according to a section line A-A 'of FIG. 1. FIG. FIG. 3 is a schematic cross-sectional view of the organic light emitting diode display device drawn according to the section line B-B 'of FIG. 1. FIG. 4 is a schematic top view of an organic light emitting diode display device according to an embodiment of the present invention. FIG. 5 is a schematic top view of an organic light emitting diode display device according to an embodiment of the present invention. FIG. 6 is a schematic top view of an organic light emitting diode display device according to an embodiment of the present invention. FIG. 7 is a schematic top view of an organic light emitting diode display device according to an embodiment of the present invention. FIG. 8 is a schematic top view of an organic light emitting diode display device according to an embodiment of the present invention. FIG. 9 is a schematic cross-sectional view of an organic light emitting diode display device drawn according to a section line A-A 'of FIG. 8. FIG. 10 is a schematic cross-sectional view of the organic light emitting diode display device drawn according to the section line B-B 'of FIG. 8. FIG. 11 is a schematic top view of an organic light emitting diode display device according to an embodiment of the present invention. FIG. 12 is a schematic cross-sectional view of an organic light emitting diode display device drawn according to a section line A-A 'of FIG. 11. FIG. 13 is a schematic cross-sectional view of the organic light emitting diode display device drawn according to the section line B-B 'of FIG. 11. FIG. 14 is a schematic top view of an organic light emitting diode display device according to an embodiment of the present invention. FIG. 15 is a schematic cross-sectional view of an organic light emitting diode display device drawn according to a section line A-A 'of FIG. 14. FIG. 16 is a schematic cross-sectional view of an organic light emitting diode display device drawn according to a section line B-B 'of FIG. 14. FIG. 17 is a schematic top view of an organic light emitting diode display device according to an embodiment of the present invention. FIG. 18 is a schematic cross-sectional view of an organic light emitting diode display device drawn according to a section line A-A 'of FIG. 17. FIG. 19 is a schematic top view of an organic light emitting diode display device according to an embodiment of the present invention. FIG. 20 is a schematic top view of an organic light emitting diode display device according to an embodiment of the present invention. FIG. 21 is a schematic top view of an organic light emitting diode display device according to an embodiment of the present invention. 22 is a schematic top view of an organic light emitting diode display device according to an embodiment of the present invention. FIG. 23 is a schematic top view of an organic light emitting diode display device according to an embodiment of the present invention. FIG. 24 is a schematic cross-sectional view of an organic light emitting diode display device drawn according to a section line A-A 'of FIG. 23.

Claims (15)

An organic light emitting diode display device includes: a substrate; and a plurality of pixel structures disposed on the substrate, wherein at least one of the pixel structures includes: an active element; a first electrode; The components are electrically connected and have a first region and a plurality of protrusions disposed outside the first region; a bank layer disposed on the first electrode, and having an opening and a sidewall defining the opening, wherein The opening of the bank layer overlaps the first region of the first electrode and the protrusions; a light-emitting layer is disposed on the first electrode and the opening of the bank layer, wherein the light-emitting layer includes a first portion And a second part, the first part is disposed on the first region of the first electrode, the second part of the light-emitting layer is disposed between the protrusions of the first electrode and the sidewall of the bank layer And the film thickness of the second portion of the light-emitting layer is greater than the film thickness of the first portion of the light-emitting layer; and a second electrode is disposed on the light-emitting layer, wherein the sidewall of the bank layer and the first electrode A surface has a junction edge, The protrusions and spaced from each other along the sides of the boundary, and the plurality of protrusions are not provided in the intermediate layer of the bank of the opening. The organic light emitting diode display device according to item 1 of the scope of patent application, wherein the sidewall of the bank layer and a surface of the first electrode have an interface edge, and the protrusions are separated from each other and along the Junction edge set. The organic light emitting diode display device according to item 1 of the scope of patent application, wherein the protrusions include a first protrusion string and a second protrusion string, and the first protrusion string is located on the bank layer. Between the side wall and the second raised string. The organic light emitting diode display device according to item 1 of the scope of patent application, wherein the sidewall of the bank layer includes a first portion and a second portion, and the first portion of the sidewall and a surface of the first electrode have A first included angle, the second portion of the sidewall and the surface of the first electrode have a second included angle, the first included angle is greater than the second included angle; the first portion of the sidewall and the adjacent to the sidewall One of the protrusions of the first portion is separated by a first distance, the second portion of the side wall is separated from the other of the protrusions adjacent to the second portion of the side wall by a second distance, and the first The two distances are smaller than the first distance. The organic light emitting diode display device according to item 1 of the scope of patent application, wherein the sidewall of the bank layer includes a first portion and a second portion, and the first portion of the sidewall and a surface of the first electrode have A first included angle, the second portion of the side wall and the surface of the first electrode have a second included angle, the first included angle is greater than the second included angle; the protrusions adjacent to the first portion of the side wall One of the has a first height, the other of the protrusions adjacent to the second portion of the side wall has a second height, and the second height is greater than the first height. The organic light emitting diode display device according to item 1 of the scope of patent application, wherein the at least one of the pixel structures includes a first pixel structure for emitting a first color light and a first pixel structure for emitting a A second pixel structure of two-color light, a plurality of protrusions of the first pixel structure are arranged at a first pitch, a plurality of protrusions of the second pixel structure are arranged at a second pitch, and the first The pitch is greater than the second pitch. The organic light-emitting diode display device according to item 6 of the scope of patent application, wherein the at least one of the pixel structures further includes a third pixel structure for emitting a third color light, and the third pixel The plurality of protrusions of the structure are arranged at a third pitch, and the second pitch is greater than the third pitch. The organic light emitting diode display device according to item 1 of the scope of patent application, wherein the at least one of the pixel structures includes a first pixel structure for emitting a first color light and a first pixel structure for emitting a A second pixel structure of two-color light, a distance between one of the plurality of protrusions of the first pixel structure and the side wall of the bank layer is greater than a distance of one of the plurality of protrusions of the second pixel structure and the bank A distance from the sidewall of the layer. The organic light emitting diode display device according to item 1 of the scope of patent application, wherein the at least one of the pixel structures includes a first pixel structure for emitting a first color light and a first pixel structure for emitting a A second pixel structure of two-color light, one of the plurality of protrusions of the first pixel structure has a first height, one of the plurality of protrusions of the second pixel structure has a second height, and the The second height is greater than the first height. The organic light emitting diode display device according to item 1 of the scope of patent application, wherein the sidewall of the bank layer includes a first portion and a second portion, and the first portion of the sidewall and a surface of the first electrode have A first included angle, the second portion of the side wall and the surface of the first electrode have a second included angle, the first included angle is greater than the second included angle; the protrusions adjacent to the first portion of the side wall A vertical projection area of the one on the substrate is larger than a vertical projection area of the other of the protrusions adjacent to the second portion of the side wall on the substrate. The organic light emitting diode display device according to item 1 of the scope of patent application, wherein the sidewall of the bank layer includes a first portion and a second portion, and the first portion of the sidewall and a surface of the first electrode have A first included angle, the second portion of the side wall and the surface of the first electrode have a second included angle, the first included angle is greater than the second included angle; the protrusions adjacent to the second portion of the side wall The plurality of raised protrusions are arranged into a third raised string and a fourth raised string, and the third raised string is located between the fourth raised string and the second portion of the side wall. The organic light-emitting diode display device according to item 11 of the scope of patent application, wherein a vertical projection area of a protrusion of the third protrusion string on the substrate is smaller than a protrusion of the fourth protrusion string on the substrate. Vertical projection area on the substrate. The organic light emitting diode display device according to item 11 of the scope of patent application, wherein the plurality of protrusions adjacent to the first portion of the first portion of the side wall are arranged in a fifth protrusion string and a sixth A raised string, and the fifth raised string is located between the sixth raised string and the first portion of the side wall. The organic light emitting diode display device according to item 13 of the scope of patent application, wherein a vertical projection area of a protrusion of the fifth protrusion string on the substrate is smaller than a protrusion of the sixth protrusion string on the substrate. Vertical projection area on the substrate. The organic light emitting diode display device according to item 1 of the scope of patent application, wherein the at least one of the pixel structures further includes: an insulating layer provided on the substrate and having a plurality of protrusions, wherein the insulating A layer is located between the first electrode and the substrate, and the protrusions of the first electrode are respectively disposed corresponding to the protrusions of the insulating layer.