TWI714115B - Display panel - Google Patents

Abstract

A display panel includes a substrate and a plurality of pixel units. Each of the pixel unit includes a first electrode, a bank structure, and a pixel structure. The bank structure has an opening, a top side opposite to the substrate and a bank side wall. The bank side wall of the bank structure is located between the first electrode and the top side. The pixel structure is disposed on the first electrode and partially overlaps with the bank structure and the opening. The pixel structure includes a first surface, a second surface and a sectional surface connecting between the first surface and the second surface. The pixel units include at least one first pixel unit and at least one second pixel unit. The pixel structure of the first pixel unit has a first sectional surface, and a length of the first sectional surface is L1. The pixel structure of the second pixel unit has a second sectional surface, and a length of the second sectional surface is L2. L1＞L2.

Description

Display panel

The present invention relates to a display panel, and particularly relates to a display panel with a retaining wall structure with different cross-section lengths.

With the advancement of science and technology, flat panel displays are the most eye-catching display technology in recent years. Among them, organic light emitting diodes (OLEDs) are self-luminous, have no viewing angle dependence, save power, are easy to process, and are low-cost. The advantages of low temperature operating range and high response speed have great application potential and are expected to become the mainstream of the next generation of flat panel displays.

Ink jet printing (IJP) can improve the utilization of materials in the OLED process to reduce costs, but before inkjet coating, it is necessary to form a bank corresponding to the pixel to define each One pixel area. However, in the drying process, the evaporation rate of the droplets sprayed on the edge of the display and sprayed on the center of the display is different. Therefore, the thickness uniformity of the film formed on the display is not good, resulting in the occurrence of speckles, resulting in a significant difference between the brightness and chromaticity of the edge of the display and the center.

The present invention provides a display panel, which can reduce the occurrence of speckles and has uniform brightness and chromaticity.

The display panel of the present invention includes a substrate and a plurality of pixel units arranged on the substrate. Each pixel unit includes a first electrode, a retaining wall structure and a pixel structure. The retaining wall structure has an opening, a top surface facing away from the substrate, and a side wall of the retaining wall. The side wall of the retaining wall of the retaining wall structure is located between the first electrode and the top surface. The pixel structure is disposed on the first electrode, and in a direction perpendicular to the substrate, a part of the pixel structure overlaps the barrier structure and the opening. The pixel structure includes a first surface located in the opening, a second surface located on the top surface, and a cross section connected between the first surface and the second surface. These pixel units include at least one first pixel unit and at least one second pixel unit. The pixel structure of the first pixel unit has a first cross section, and the length of the first cross section is L1. The pixel structure of the second pixel unit has a second cross section, and the length of the second cross section is L2, where L1>L2.

Based on the foregoing, the display panel of an embodiment of the present invention can adjust the volume of the retaining wall structure so that the opening can accommodate pixel structures with different film thicknesses as required, so the pixel structure can be placed on the retaining wall structure. Adjust the length of the cross section to control the overall volume of the pixel structure. Under the above arrangement, the length of the first cross section of the pixel structure of the first pixel unit located in the peripheral area may be greater than the length of the second cross section of the pixel structure of the second pixel unit located in the central area. In this way, compared to the second pixel unit, the retaining wall structure of the first pixel unit can be attached with more pixel structures or accommodate more pixel structures. Therefore, after the drying process, the uniformity of the film thickness of the pixel units located in different regions on the display panel can be consistent, so as to reduce the occurrence of streaks and have uniform brightness and chromaticity.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail in conjunction with the accompanying drawings.

10, 10A, 10B, 10C, 10D, 10E, 10F: display panel

12: Central District

14: Surrounding area

100: substrate

110, 210: insulating layer

120, 220, 320: first electrode

122, 222: first conductive layer

124, 224: second conductive layer

126, 226: third conductive layer

140, 140A, 140C, 140D, 240, 240A, 240C, 240D, 340: retaining wall structure

127, 141, 141A, 141D, 227, 241, 241A, 241D, 327: top surface

142, 142A, 142B, 142C, 142D, 242, 242A, 242B, 242C, 242D, 342: opening

143, 143A, 143C, 143D, 243, 243A, 243C, 243D, 343: side wall of retaining wall

144C, 244C: accommodation space

160: pixel structure

162, 162’, 162", 162A, 162B, 162B’: hole injection layer

1621, 1621A, 1623, 1623B, 1623B’, 1625, 191, 192, 193: first surface

1622, 1622A, 1622B, 1622B’, 194: second surface

1624, 1624A, 1624B, 1624B’: first section

1624’: Second section

1624": third section

164: hole transport layer

166: light-emitting layer

167: Electron Transport Layer

168: electron injection layer

180: The first dielectric pattern

181, 281: Junction

183, 286: inner surface

190: second electrode

280: second dielectric pattern

A-A’, B-B’: Section line

D1: first width

D2: second width

H1: first height

H2: second height

K1, K1A: the first line segment

K2, K2A: second line segment

K3: The third line segment

L1, L1A, L1B, L1C, L1D, L2, L2A, L2B, L2B’, L2C, L2D, L3: long

N: direction

PX: pixel unit

PX1, PX1A, PX1B, PX1C, PX1D: the first pixel unit

PX2, PX2A, PX2B, PX2B’, PX2C, PX2D: second pixel unit

PX3: The third pixel unit

T1, T2, T1’, T2’, T3’: thickness

V1, V2: Capacity

Y1, Y2, Y2’, Y3, YA, YB, YC: height

θ1: the first angle

θ2: second angle

FIG. 1 is a schematic top view of a display panel in an embodiment of the invention.

2A is a schematic cross-sectional view of the first pixel unit along the section line A-A' in FIG. 1.

2B is a schematic cross-sectional view of the second pixel unit along the cross-sectional line B-B' in FIG. 1.

3A is a schematic cross-sectional view of a first pixel unit of a display panel in another embodiment of the invention.

3B is a schematic cross-sectional view of the second pixel unit of the display panel in another embodiment of the invention.

4A is a schematic cross-sectional view of a first pixel unit of a display panel in another embodiment of the invention.

4B is a schematic cross-sectional view of the second pixel unit of the display panel in another embodiment of the invention.

4C is a schematic cross-sectional view of the second pixel unit of the display panel in another embodiment of the invention.

FIG. 5A is a schematic cross-sectional view of a first pixel unit of a display panel in another embodiment of the invention.

FIG. 5B is a schematic cross-sectional view of the second pixel unit of the display panel in another embodiment of the invention.

6A is a schematic cross-sectional view of a first pixel unit of a display panel in another embodiment of the invention.

6B is a schematic cross-sectional view of the second pixel unit of the display panel in another embodiment of the invention.

FIG. 7 is a schematic cross-sectional view of a display panel in another embodiment of the invention.

FIG. 8 is a schematic cross-sectional view of a display panel in still another embodiment of the invention.

FIG. 9 is a schematic cross-sectional view of a display panel in still another embodiment of the invention.

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. Throughout the specification, the same reference numerals denote the same elements. It should 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. As used herein, "connected" can refer to physical and/or electrical connection. Furthermore, "electrically connected" or "coupled" may mean that there are other elements between two elements.

It should be understood that although the terms "first", "second", "third", etc. may be used herein to describe various elements, components, regions, layers and/or parts, these elements, components, regions, and/or Or part should not be restricted by these terms. These terms only Used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Therefore, the “first element”, “component”, “region”, “layer” or “portion” discussed below may be referred to as a second element, component, region, layer or section without departing from the teachings herein.

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

FIG. 1 is a schematic top view of a display panel in an embodiment of the present invention. For the convenience of description and observation, only some components are schematically shown in FIG. 1. 2A is a schematic cross-sectional view of the first pixel unit along the section line A-A' in FIG. 1. 2B is a schematic cross-sectional view of the second pixel unit along the cross-sectional line B-B' in FIG. 1. Please refer to FIG. 1, FIG. 2A and FIG. 2B, the display panel 10 of this embodiment is, for example, a self-luminous display panel. In this embodiment, the display panel 10 is illustrated by taking an organic light emitting diode (OLED) display panel as an example. The display panel 10 includes a substrate 100 and a plurality of pixel units PX are disposed on the substrate 100.

The substrate 100 has a central area 12 and a peripheral area 14 other than the central area 12 to carry these pixel units PX in the central area 12 and the peripheral area 14 respectively. In this embodiment, the material of the substrate 100 can be glass, quartz, organic polymers, or opaque/reflective materials (for example, conductive materials, wafers, ceramics, or other materials). Applicable materials), or other applicable materials, the present invention is not limited thereto.

In some embodiments, the substrate 100 may further include an active device array (not shown), wherein the above-mentioned active device array includes a plurality of thin film transistors (not shown), such as low temperature polysilicon thin film transistors (low temperature poly -Si, LTPS) or amorphous Si (a-Si), but the invention is not limited thereto. The thin film transistors are respectively electrically connected to the corresponding pixel units PX.

The pixel unit PX provided on the substrate 100 is, for example, an organic electroluminescence element. Each pixel unit PX includes first electrodes 120 and 220, barrier structures 140 and 240, and pixel structure 160. For example, the first electrodes 120 and 220 may be electrically connected to thin film transistors, but the invention is not limited thereto. In this embodiment, the materials of the first electrodes 120 and 220 are conductive materials, such as aluminum (Al), silver (Ag), chromium (Cr), copper (Cu), nickel (Ni), titanium (Ti), molybdenum (Mo), magnesium (Mg), platinum (Pt), gold (Au) or a combination thereof. In some embodiments, the material of the first electrodes 120 and 220 may also include transparent or semi-transparent conductive materials, such as zinc oxide (ZnO), indium tin oxide (ITO), indium zinc oxide (IZO), indium gallium zinc oxide (IGZO), indium gallium oxide (IGO), zinc gallium oxide (ZGO), or other suitable materials, but the present invention is not limited thereto. The first electrodes 120 and 220 may have a single-layer, double-layer or multilayer structure. For example, the first electrodes 120 and 220 may include first conductive layers 122 and 222 and second conductive layers 124 and 224. In this embodiment, the first electrodes 120 and 220 further include third conductive layers 126 and 226. Hereinafter, the first electrodes 120 and 220 will be described as a three-layer structure.

In this embodiment, in the direction perpendicular to the substrate 100, the first electrode 120 and 220 include first conductive layers 122 and 222 arranged on the substrate 100, second conductive layers 124 and 224 vertically stacked on the first conductive layers 122 and 222, and vertically stacked on the second conductive layers 124 and 224. The third conductive layer 126,226. In this embodiment, the first electrodes 120 and 220 have a three-layer structure composed of ITO/Ag/ITO (indium tin oxide). In some embodiments, the first electrodes 120 and 220 may also have a three-layer structure composed of Ti/Al/Ti and Mo/Al/Mo. In other embodiments, the first electrodes 120 and 220 may also include reflective electrodes, and the material may be a metal with good reflectivity to visible light, such as aluminum, molybdenum, gold or a combination thereof. In some embodiments, the method for forming the first electrodes 120 and 220 may be chemical vapor deposition (CVD), physical vapor deposition (PVD), atomic layer deposition (ALD), vapor deposition (VTE), sputtering (SPT). ) Or a combination thereof. In some embodiments, the first electrodes 120 and 220 may be anodes of the pixel unit PX.

The wall structures 140 and 240 of the pixel unit PX are, for example, pixel definition layers that define the area of the pixel unit PX. In some embodiments, the barrier structure 140, 240 may be a hydrophobic material, for example, a fluorine-containing negative photoresist is used as the material, but the invention is not limited thereto.

The retaining wall structures 140 and 240 have openings 142 and 242. In this embodiment, the retaining wall structures 140 and 240 can define the side walls of the retaining wall structures 140 and 240 by forming the openings 142 and 242. The method for forming the openings 142 and 242 includes yellow light photolithography or other suitable methods. In this embodiment, the retaining wall structures 140 and 240 have top surfaces 141 and 241 far away from and facing away from the substrate 100 and side walls 143 and 243 of the retaining wall. The side walls 143 and 243 of the retaining wall are located between the first electrodes 120 and 220 and the top surfaces 141 and 241. In this embodiment, the side walls 143 and 243 of the retaining wall may be directly connected between the first electrodes 120 and 220 and the top surfaces 141 and 241, but the invention is not limited thereto. From another perspective, the openings 142 and 242 and the side walls 143 and 243 of the wall can be formed to form the wall structures 140 and 240 defining the area of the pixel unit PX. In this embodiment, the space in the openings 142 and 242 can be used to accommodate the inkjet-coated organic light-emitting diode material and fix it well.

In this embodiment, the pixel unit PX further includes a pixel structure 160 disposed on the first electrode 120. The pixel structure 160 is, for example, a composite layer of a plurality of film layers constituting an organic light emitting diode, but the present invention is not limited thereto. In this embodiment, the pixel structure 160 includes, for example, a hole injection layer 162, a hole transport layer 164 (shown in FIG. 8), and a light-emitting layer 166 (shown in FIG. 8). The pixel structure 160 also includes an electron transport layer 167 and an electron injection layer 168 (shown in FIG. 8). The material of the hole injection layer 162 is, for example, xylylene blue copper, star-shaped aromatic amines, polyaniline, polyethylene dioxythiophene or other suitable materials. The material of the hole transport layer 164 is, for example, triaromatic amines, cross-structured diamine diphenyl, diamine diphenyl derivatives or other suitable materials. The light-emitting layer 166 may be a red organic light-emitting pattern, a green organic light-emitting pattern, a blue organic light-emitting pattern, or a light-emitting pattern of different colors (such as white, orange, yellow, etc.) generated by mixing light of various spectrums. In other words, different pixel units PX can respectively emit color lights of different colors. In some embodiments, different pixel units PX can also emit the same color light, and the present invention is not limited thereto. The material of the electron transport layer 167 may be an oxazole derivative and its dendrimer, a metal chelate compound (for example, Alq3), an azole compound, a diazanthene derivative, a silicon-containing heterocyclic compound, or other suitable materials.

In this embodiment, in order to improve the utilization of materials and reduce the manufacturing cost of the pixel unit PX, the pixel structure 160 may be formed by ink jet printing (IJP). For example, the hole injection layer 162, the hole transport layer 164 and the light-emitting layer 166 can be formed on the top surface 127 of the first electrode 120 by an inkjet coating process; and the electron transport layer 167 and the electron injection layer 168 It is formed on the light-emitting layer 166 by a thermal evaporation process. Due to the difference between the surface tension of the liquid and the adsorption force of the side walls 143 and 243 of the retaining wall, the film thickness of the droplets may be uneven during the drying process. Therefore, the thickness of the hole injection layer 162 formed by the above-mentioned process increases away from the opening 142, The center of 242 gradually increases toward the side walls 143 and 243 of the retaining wall. In some embodiments, one or at least one of the hole injection layer 162, the hole transport layer 164, the light emitting layer 166, the electron transport layer 167, and the electron injection layer 168 can also be formed by an inkjet coating process. The invention is not limited to this.

As shown in FIGS. 2A and 2B, in the direction N perpendicular to the substrate 100, part of the pixel structure 160 overlaps the retaining wall structures 140 and 240 and the openings 142 and 242. For example, when the pixel structure 160 is formed through an inkjet coating process, part of the pixel structure 160 can be accommodated in the openings 142 and 242 to have heights Y1 and Y2, and a part of the pixel structure 160 can be It is formed on the top surfaces 141 and 241 of the retaining wall structures 140 and 240. In addition, there are some pixel structures 160 that can be attached to the side walls 143 and 243 of the wall structures 140 and 240 based on the surface tension of the liquid. In this embodiment, the pixel structure 160 has a first surface 1621 and 1623 in the openings 142 and 242, respectively, and a second surface 1622 on the top surfaces 141 and 241 of the retaining wall structures 140 and 240. As shown in FIG. 2A, the height Y1 can be defined as, for example, in the direction perpendicular to the substrate 100 On N, the vertical distance from the first surface 1621 in the center of the opening 142 (for example, the flat surface of the pixel structure 160 in the opening 142 shown in FIG. 2A) to the top surface 127 of the first electrode 120. As shown in FIG. 2B, the height Y2 can be defined as, for example, in the direction N perpendicular to the substrate 100, from the first surface 1623 in the center of the opening 242 (for example, the flat surface of the pixel structure 160 in the opening 242 shown in FIG. 2B) to The vertical distance of the top surface 227 of the first electrode 220. The pixel structure 160 also has a cross section attached to the side walls 143 and 243 of the retaining wall (for example, the first cross section 1624 and the second cross section 1624', which will be described later in the specification), and the cross section can be along the side walls 143, 243 of the retaining wall. 243 extends along to connect between the first surface 1621, 1623 and the second surface 1622.

Please continue to refer to FIGS. 1, 2A and 2B. In this embodiment, the pixel units PX include at least one first pixel unit PX1 and at least one second pixel unit PX2. As shown in FIGS. 1, 2A, and 2B, the first pixel unit PX1 is corresponding to the peripheral area 14, and the second pixel unit PX2 is corresponding to the central area 12, and the peripheral area 14 surrounds the central area 12. However, the present invention is not limited to this. It should be noted here that FIG. 1 only schematically shows a first pixel unit PX1 and a second pixel unit PX2, but in fact the first pixel unit PX1 and the second pixel unit PX2 are numbers One hundred thousand, millions or tens of millions are arranged in an array. In other words, the actual number and arrangement of the first pixel unit PX1 and the second pixel unit PX2 are not limited to the number and pattern shown in FIG. 1, but are determined according to the needs of the user.

It is worth noting that, referring to FIGS. 1 and 2A first, the pixel structure 160 of the first pixel unit PX1 located in the peripheral area 14 has a first cross section 1624. The first cross section 1624 is connected between the first surface 1621 and the second surface 1622. First section The length of 1624 is L1, and the length L1 of the first cross section 1624 can be defined as the distance extending from the second surface 1622 to the first surface 1621 along the side wall 143 of the retaining wall. 1 and 2B, the pixel structure 160 of the second pixel unit PX2 located in the central area 12 has a second cross section 1624'. The second cross section 1624' is connected between the first surface 1623 and the second surface 1622. The length of the second cross section 1624' is L2, and the length L2 of the second cross section 1624' can be defined as the distance from the second surface 1622 along the side wall 243 of the retaining wall to the first surface 1623. In this embodiment, L1>L2.

This is because, as shown in FIG. 2A, the side wall 143 of the retaining wall in the peripheral area 14 may have a first section K1. The first section K1 can be defined as the length of the side wall 143 of the retaining wall extending from the top surface 141 to the top surface 127 of the first electrode 120. As shown in FIG. 2B, the side wall 243 of the retaining wall in the central area 12 may have a second section K2. The second section K2 can be defined as the length of the side wall 243 of the retaining wall extending from the top surface 241 to the top surface 227 of the first electrode 220. Under the above arrangement, when the thickness of the first electrode 120 of the first pixel unit PX1 is less than the thickness of the first electrode 220 of the second pixel unit PX2, the length of the first section K1 of the side wall 143 of the retaining wall may be greater than The length of the second section K2 of the side wall 243 of the retaining wall. For example, as shown in FIG. 2A, the thickness of the first conductive layer 122 of the first electrode 120 is T1, the thickness of the first conductive layer 222 of the first electrode 220 is T2, and T2>T1. In this way, the user can change the thickness of the first electrode 120 by adjusting the thickness T1 of the first conductive layer 122, and can change the thickness of the first electrode 220 by adjusting the thickness T2 of the first conductive layer 222, but the present invention Not limited to this. In some embodiments, the thickness of the first electrodes 120 and 220 can also be achieved by adjusting the second conductive layers 124 and 224 or the third conductive layers 126 and 226. By this, The thickness T1 of the first conductive layer 122 may be smaller than the thickness T2 of the first conductive layer 222, so that the overall thickness of the first electrode 120 is smaller than the overall thickness of the first electrode 220. Therefore, the length of the first section K1 of the side wall 143 of the retaining wall is greater than the length of the second section K2 of the side wall 243 of the retaining wall. In other words, when the overall height of the display panel 10 is the same, the distance from the top surface 141 of the barrier structure 140 of the first pixel unit PX1 to the top surface 127 of the first electrode 120 will be greater than that of the second pixel unit PX2. The distance from the top surface 241 of the retaining wall structure 240 to the top surface 227 of the first electrode 220. In other words, the length L1 of the first section 1624 attached to the side wall 143 of the retaining wall may be greater than the length L2 of the second section 1624' attached to the side wall 243 of the retaining wall. From another perspective, the volume of the pixel structure 160 adsorbed by the wall structure 140 of the first pixel unit PX1 may be larger than the volume of the pixel structure 160 adsorbed by the wall structure 240 of the second pixel unit PX2. In this way, the overall volume of the pixel structure 160 can be controlled by adjusting the length of the cross section of the pixel structure 160 on the retaining wall structures 140 and 240.

In addition, under the above arrangement, the space in the opening 142 of the first pixel unit PX1 may be larger than the space in the opening 242 of the second pixel unit PX2. That is, the volume of the first pixel unit PX1 is larger than the volume of the second pixel unit PX2. In this way, when forming the first pixel unit PX1 and forming the second pixel unit PX2, the pixel structure 160 of the same volume (for example: the hole injection layer 162 with the same number of droplets) is used, the larger volume of the first The height Y1 of the pixel structure 160 in the pixel unit PX1 is smaller than the height Y2 of the pixel structure 160 in the second pixel unit PX2 with a smaller volume. Therefore, the first pixel unit PX1 having a lower height Y1 can ensure that the length L1 of the first cross section 1624 can be greater than the length L2 of the second cross section 1624. From the other corner In terms of degrees, a longer cross-section may mean that the pixel unit has more volume to accommodate the pixel structure 160. Therefore, compared with the second pixel unit PX2, the opening 142 of the first pixel unit PX1 located in the peripheral area 14 can accommodate more ink-jet-coated liquid hole injection layers 162, or more The hole transport layer 164 (shown in FIG. 8) or the light-emitting layer 166 (shown in FIG. 8) is also coated by inkjet. Based on the above, the overall thickness of each film layer of the first pixel unit PX1 located in the peripheral area 14 can be further set to be greater than the overall thickness of each film layer of the second pixel unit PX2 located in the central area 12. In other words, in the drying process, the first pixel unit PX1 with a smaller film thickness (but more pixel structures 160 can be adsorbed on the side wall 143 of the retaining wall) can be located in the peripheral area 14 with a high volatilization rate, and The second pixel unit PX2 with a larger film thickness (but with less pixel structure 160 adsorbed on the side wall 243 of the retaining wall) may be located in the central area 12 with a low volatilization rate. Therefore, after volatilization in the drying process, the film thickness uniformity of the pixel units PX (including the first pixel unit PX1 and the second pixel unit PX2) located in different regions on the display panel 10 can be consistent to reduce the pattern. Produce, more uniform brightness and chroma.

In addition, since the cross-sections K1, K2 of the retaining wall structures 140, 240 of the display panel 10 in the central area 12 or the peripheral area 14 can be adjusted to control the pixel structure of the first pixel unit PX1 and the second pixel unit PX2 The lengths L1 and L2 of the first section 1624 and the second section 1624' of 160. Therefore, when performing inkjet coating, it is not necessary to control the film thickness by separately adjusting the droplet concentration of each film layer as in the conventional process, but can simply adjust the first pixel unit PX1 and the second pixel unit. The number of droplets in the element unit PX2 can be used to control the film thickness, further simplifying the process, shortening the process time and saving cost. In addition, by adjusting the retaining wall structures 140, 240, the space in the openings 142, 242 can match the required number of droplets. Therefore, during inkjet coating, the chance of droplets overflowing can be reduced, and the tolerance requirements of the manufacturing process can be increased. The manufacturing yield of the display panel 10.

The following embodiments follow the component numbers and part of the content of the previous embodiments, where the same numbers are used to represent the same or similar components. For the omission of the same technical content, please refer to the aforementioned embodiments. The following embodiments will not Repeat it.

3A is a schematic cross-sectional view of a first pixel unit of a display panel in another embodiment of the invention. 3B is a schematic cross-sectional view of the second pixel unit of the display panel in another embodiment of the invention. The display panel 10A shown in this embodiment is similar to the display panel 10 shown in FIGS. 2A and 2B. The main difference is that there is a first angle between the side wall 143A of the barrier wall of the first pixel unit PX1A and the first electrode 120 θ1, there is a second angle θ2 between the barrier wall 243A of the second pixel unit PX2A and the first electrode 220, and θ1>θ2. Under the above arrangement, the absolute value of the slope of the side wall 143A of the retaining wall structure 140A of the first pixel unit PX1A is smaller than the absolute value of the slope of the side wall 243A of the retaining wall structure 240A of the second pixel unit PX2A. In other words, the side wall 243A of the barrier wall is closer to perpendicular to the substrate 100 than the side wall 143A of the barrier wall. From another perspective, the length of the first section K1A (defined as the distance from the top surface 141A to the top surface 127) of the retaining wall side wall 143A with a lower absolute value of slope can be greater than that of the retaining wall side wall 243A with a higher absolute value of slope. The second section K2A (defined as the distance from the top surface 241A to the top surface 227). Under the above arrangement, the volume in the first pixel unit PX1A may be greater than the volume in the second pixel unit PX2A. First pixel unit The length L1A of the first cross section 1624A connecting the first surface 1621A and the second surface 1622A of the pixel structure 160 of PX1A (for example: hole injection layer 162A) may be greater than that of the pixel structure 160 of the second pixel unit PX2A ( For example, the hole injection layer 162B) is the length L2A of the second section 1624B connecting the first surface 1623B and the second surface 1622B. In this way, the overall volume of the pixel structure 160 can be controlled by adjusting the length of the cross section of the pixel structure 160 on the retaining wall structures 140A and 240A.

In this embodiment, except that the space in the opening 142A of the retaining wall structure 140A of the first pixel unit PX1A may be greater than the space in the opening 242A of the retaining wall structure 240A of the second pixel unit PX2A, the side wall 143A of the retaining wall is relatively liquid The adsorption force of the retaining wall can also be greater than the adsorption force of the side wall 243A for the liquid. Therefore, the hole injection layer 162A (or other film layer) of the first pixel unit PX1A can be attached to the side wall 143A of the retaining wall in a larger volume, while the hole injection layer 162B (or other film layer) of the second pixel unit PX2A ) Is attached to the side wall 243A of the retaining wall with a relatively small volume. In this way, compared to the second cross section 1624B, the longer first cross section 1624A can indicate that more volume of the pixel structure 160 is attached to the side wall 143A of the retaining wall or accommodated in the opening 142A, so as to include the first picture. The display panel 10A of the pixel unit PX1A and the second pixel unit PX2A can achieve similar technical effects to the above-mentioned embodiment.

4A is a schematic cross-sectional view of a first pixel unit of a display panel in another embodiment of the invention. 4B is a schematic cross-sectional view of the second pixel unit of the display panel in another embodiment of the invention. 4C is a schematic cross-sectional view of the second pixel unit of the display panel in another embodiment of the invention. The display panel shown in this embodiment 10B is similar to the display panel 10 shown in FIGS. 2A and 2B. The main difference is that: the first pixel unit PX1B further includes a first dielectric pattern 180 disposed between the first electrode 120 and the side wall 143 of the retaining wall and the second The pixel unit PX2B further includes a second dielectric pattern 280 disposed between the first electrode 220 and the side wall 243 of the barrier wall. As shown in FIGS. 4A and 4B, the barrier structure 140 partially covers the first dielectric pattern 180, and the barrier structure 240 partially covers the second dielectric pattern 280. From another perspective, in the direction N perpendicular to the substrate 100, the opening 142B of the first pixel unit PX1B may overlap a portion of the first dielectric pattern 180 to expose a portion of the first dielectric pattern 180, and the second The opening 242B of the pixel unit PX2B may overlap a portion of the second dielectric pattern 280 to expose a portion of the second dielectric pattern 280. In this embodiment, the side walls 143, 243 of the retaining wall are located between the first electrodes 120, 220 and the top surfaces 141A, 241, and the side walls 143, 243 of the retaining wall are in direct contact and are exposed by the openings 142B, 242B (also can be regarded as Overlapping with the openings 142B and 242B) of the first dielectric pattern 180 and the second dielectric pattern 280.

Under the above arrangement, the portion where the opening 142B of the first pixel unit PX1B overlaps the first dielectric pattern 180 can define the first width D1. Specifically, the first width D1 can be defined as: in the direction N perpendicular to the substrate 100, from the junction 181 where the side wall 143 of the barrier wall contacts the first dielectric pattern 180 to the inside of the first dielectric pattern 180 located in the opening 142B The distance from the surface 183. In addition, the portion where the opening 242B of the second pixel unit PX2B overlaps the second dielectric pattern 280 may define a second width D2. Specifically, the second width D2 can be defined as: in the direction N perpendicular to the substrate 100, from the junction 281 where the side wall 243 contacts the second dielectric pattern 280 to the inside of the second dielectric pattern 280 located in the opening 242B The distance from surface 283. In this example , The first width D1>the second width D2. From another perspective, the first width D1 of the first dielectric pattern 180 generally refers to the width of the side wall 143 of the retaining wall structure 140 in a direction parallel to the substrate 100, and the second dielectric The second width D2 of the pattern 280 generally refers to the width of the side wall 243 of the retaining wall structure 240 beyond the width of the retaining wall structure 240 in a direction parallel to the substrate 100.

Under the above arrangement, compared to the second pixel unit PX2B, in the direction N perpendicular to the substrate 100, the opening 142B of the first pixel unit PX1B overlaps more with the first width D1 of the first dielectric pattern 180 (for example : Expose more of the first width D1 of the first dielectric pattern 180), and the opening 242B overlaps the second width D2 of the second dielectric pattern 280, which is less than the first pixel unit PX1B (for example: less exposed The second width D2 of the second dielectric pattern 280). As such, the adsorption force of the first dielectric pattern 180 of the first pixel unit PX1B for liquid may be greater than the adsorption force of the second dielectric pattern 280 of the second pixel unit PX2B for liquid. Therefore, the hole injection layer 162A (or other film layer) of the first pixel unit PX1B can have a larger volume on the side wall 143 of the retaining wall, while the hole injection layer 162B (or other film layer) of the second pixel unit PX2B Layer) has a relatively small volume on the side wall 243 of the retaining wall. The first dielectric pattern 180 can also increase the adsorption force to the first surface 1621 of the pixel structure 160 (for example, the hole injection layer 162A), and therefore can further increase the height of the hole injection layer 162A of the first pixel unit PX1B Y1 is set to be smaller than the height Y2 of the hole injection layer 162B of the second pixel unit PX2B. In this way, it can be ensured that the length L1B of the first cross section 1624A is greater than the length L2B of the second cross section 1624B, and the first pixel unit PX1B can accommodate or absorb more volume of the pixel structure 160. In addition, it includes the first pixel unit PX1B and The display panel 10B of the second pixel unit PX2B can also achieve similar technical effects to the above-mentioned embodiment.

In some embodiments, as shown in FIG. 4C, there may be no dielectric pattern (for example, the second dielectric pattern 280 shown in FIG. 4B) in the opening 242B. Under the above arrangement, compared to the first pixel unit PX1B shown in FIG. 4A or the second pixel unit PX2B shown in FIG. 4B, the retaining wall side wall 243 of the second pixel unit PX2B' has an adsorption force for liquid It is smaller than the side wall 143 of the retaining wall of the first pixel unit PX1B. In this way, the length L2B' of the second section 1624B' connected between the first surface 1623B' and the second surface 1622B' may be smaller than the length L1B of the first section 1624A. In addition, in this embodiment, compared to the hole injection layer 162B shown in FIG. 4B, the height Y2' of the hole injection layer 162B' may be greater than or equal to the height Y2 of the hole injection layer 162B, but the present invention does not This is limited. Therefore, the display panel 10B including the first pixel unit PX1B and the second pixel unit PX2B' can achieve similar technical effects as the above-mentioned embodiment. In addition, in other embodiments, the second pixel unit PX2B, PX2B' can also be provided in the central area 12 (shown in FIG. 1) of the display panel 10B at the same time to further adjust the pixel unit PX1B on the display panel 10B , PX2B, PX2B' overall film thickness uniformity, but the present invention is not limited to this.

FIG. 5A is a schematic cross-sectional view of a first pixel unit of a display panel in another embodiment of the invention. FIG. 5B is a schematic cross-sectional view of the second pixel unit of the display panel in another embodiment of the invention. The display panel 10C shown in this embodiment is similar to the display panel 10 shown in FIGS. 2A and 2B. The main difference is that: the first pixel unit PX1C further includes an accommodation space 144C disposed on the first electrode 120 and the side wall of the retaining wall Between 143C. The second pixel unit PX2C further includes an accommodation space 244C disposed between the first electrode 220 and the side wall 243C of the retaining wall. The capacity of the accommodation space 144C of the first pixel unit PX1C is V1, the capacity of the accommodation space 244C of the second pixel unit PX2C is V2, and V1>V2. With the above arrangement, the space in the opening 142C of the first pixel unit PX1C may be larger than the space in the opening 242C of the second pixel unit PX2C. In other words, compared to the opening 242C of the second pixel unit PX2C, the opening 142C of the first pixel unit PX1C can accommodate more hole injection layers 162 (or other film layers). Therefore, compared to the second pixel unit PX2C shown in FIG. 5B, in the opening 142C of the first pixel unit PX1C, a larger volume of hole injection layer 162A can be filled into the accommodating space 144C. In some embodiments, since the accommodating space of the accommodating space 144C can be larger than the volume of the hole injection layer 162A, the hole injection layer 162A can only partially fill the accommodating space 144C, and the second pixel unit PX2C The hole injection layer 162B in the opening 242C can fill the accommodating space 244C, whereby the height Y1 of the hole injection layer 162A is smaller than the height Y2 of the hole injection layer 162B. In this way, the length L1C of the first cross section 1624A of the first pixel unit PX1C can be greater than the length L2C of the second cross section 1624B of the second pixel unit PX2C, so that the first pixel unit PX1C can accommodate or absorb more pixels. The volume of the structure 160. In addition, the display panel 10C including the first pixel unit PX1C and the second pixel unit PX2C can also achieve technical effects similar to the above-mentioned embodiments.

6A is a schematic cross-sectional view of a first pixel unit of a display panel in another embodiment of the invention. 6B is a schematic cross-sectional view of the second pixel unit of the display panel in another embodiment of the invention. The display panel 10D shown in this embodiment and the figure The display panel 10 shown in 2A and FIG. 2B is similar, and the main difference is that the display panel 10D further includes insulating layers 110 and 210 respectively disposed between the substrate 100 and the corresponding pixel units PX1D and PX2D. Specifically, the insulating layer 110 may be disposed between the substrate 100 and the first electrode 120, and the insulating layer 210 may be disposed between the substrate 100 and the first electrode 220, for example. The materials of the insulating layers 110 and 210 are, for example, insulating materials, including polyethylene terephthalate (PET), polyimide (PI), or triacetylcellulose (TAC), but the The invention is not limited to this. In this embodiment, the insulating layer 110 and the insulating layer 210 are, for example, an integrally formed insulating layer, and the insulating layer 110 corresponding to the first pixel unit PX1D has a first height H1, which corresponds to the second pixel unit PX1D. The insulating layer 210 at PX2D has a second height H1. From another perspective, the insulating layer (including the insulating layers 110 and 210) has both the first height H1 and the second height H2, but the present invention is not limited to this. In this embodiment, the second height H2>the first height H1.

Under the above configuration, when the overall height of the display panel 10D is the same, that is to say, the top surface 141D of the retaining wall structure 140D of the first pixel unit PX1D and the top surface of the retaining wall structure 240D of the second pixel unit PX2D When the 241D is located on the same plane and is aligned, the length of the first section K1 of the side wall 143D of the retaining wall may be greater than the length of the second section K2 of the side wall 243D of the retaining wall. In this way, the space in the opening 142D may be larger than the space in the opening 242D. From another perspective, the height Y1 of the hole injection layer 162A of the first pixel unit PX1D is smaller than the height Y2 of the hole injection layer 162B of the second pixel unit PX2D. In this way, the length L1D of the first cross section 1624A is greater than the length L2D of the second cross section 1624B, so that the first pixel unit PX1D can be accommodated or To absorb more volume of pixel structure 160. In addition, the display panel 10D including the first pixel unit PX1D and the second pixel unit PX2D can achieve technical effects similar to the above-mentioned embodiment.

FIG. 7 is a schematic cross-sectional view of a display panel in another embodiment of the invention. Compared with the display panel 10 shown in FIGS. 2A and 2B, the pixel units PX of the display panel 10E shown in FIG. 7 further include a third pixel unit PX3. In this embodiment, the first pixel unit PX1, the second pixel unit PX2, and the third pixel unit PX3 are used to emit the first color light, the second color light, and the third color light, respectively. For example, the first color light may be blue light, the second color light may be green light, and the third color light may be red light, but the invention is not limited thereto. In some embodiments, any two or any three of the first color light, the second color light, and the third color light may also be the same color light.

It should be noted that the retaining wall structure 340 of the third pixel unit PX3 has an opening 342 and a side wall 343 of the retaining wall. The retaining wall side wall 343 has a third section K3, for example. In this embodiment, when the overall height of the display panel 10E is uniform, the thickness T1' of the first electrode 120 of the first pixel unit PX1 is smaller than the thickness T2' of the first electrode 220 of the second pixel unit PX2. The thickness T3' of the first electrode 320 of the third pixel unit PX3, therefore, the length of the first section K1 is greater than the length of the second section K2 and the length of the third section K3. Thereby, the space in the opening 142 of the first pixel unit PX1 is larger than the space in the opening 242 of the second pixel unit PX2 than the space in the opening 342 of the third pixel unit PX3. From another perspective, the length L1 of the first section 1624 (defined as the distance from the first surface 1621 to the second surface 1622) is greater than the length L2 of the second section 1624' (defined as the first surface 1623 to the second surface 1622) is greater than the length L3 (defined as the distance from the first surface 1625 to the second surface 1622) of the third cross section 1624". Thus, the height Y1 (defined as the first pixel unit PX1) of the hole injection layer 162 The distance from one surface 1621 to the top surface 127) is smaller than the height Y2 of the hole injection layer 162' of the second pixel unit PX2 (defined as the distance from the first surface 1623 to the top surface 227) is smaller than the electricity of the third pixel unit PX3 The height Y3 of the hole injection layer 162" (defined as the distance from the first surface 1625 to the top surface 327). However, the present invention is not limited to this. Those with ordinary knowledge in the technical field should understand that as long as any one of the lengths L1, L2, and L3 of the cross-section is different from the other two, the pixel structure 160 of any one of the pixel units PX1, PX2, PX3 The film thickness can be adjusted to be different from the other two film thicknesses. In this way, the hole injection layers 162, 162', 162" (or other film layers) in the first pixel unit PX1, the second pixel unit PX2, and the third pixel unit PX3 can be adjusted through the retaining wall structures 140, 240, and 340. ) Film thickness. Therefore, in inkjet coating, it is not necessary to control the overall film thickness of different pixel units PX1, PX2, PX3 by adjusting the droplet concentration of each film layer as in the conventional process. Simply adjust the number of droplets in the first pixel unit PX1, the second pixel unit PX2 and/or the third pixel unit PX3 to control the film thickness, which further simplifies the process, shortens the process time and saves costs.

In some embodiments, the cross-sectional length of the pixel structure can also be adjusted by adjusting the angle of the sidewall structure, forming an accommodating space on the sidewall structure, or adjusting the thickness of the flat layer as in the above-mentioned embodiments, which will not be repeated here.

In short, since the display panel 10E can adjust the volume of the retaining wall structure 140, 240, 340, the openings 142, 242, 342 can accommodate different films according to requirements. Thick pixel structure 160. The pixel structure can be controlled by adjusting the length L1, L2, and L3 of the cross section of the pixel structure 160 on the retaining wall structure 140, 240, 340 (for example, the first cross section 1624, the second cross section 1624', and the third cross section 1624"). The overall volume of 160. In this way, the same concentration of film droplets can be selected for inkjet coating to meet the needs of different thicknesses. In this way, the manufacturing process of the display panel 10E can be simplified and the cost can be saved, and different colors can be adjusted according to requirements The film thickness of the pixel units (for example: pixel units PX1, PX2, PX3) to reduce the occurrence of speckles, and have uniform brightness and chromaticity.

FIG. 8 is a schematic cross-sectional view of a display panel in still another embodiment of the invention. The display panel 10F shown in this embodiment is similar to the display panel 10E shown in FIG. 7, the main difference is: each pixel unit PX1, PX2, PX3 also includes a hole transport layer 164 disposed on the hole injection layer 162 , The light-emitting layer 166 is disposed on the hole transport layer 164 and the second electrode 190 is disposed on the light-emitting layer 166. In some embodiments, an electron transport layer 167 and an electron injection layer 168 may be further included between the second electrode 190 and the light emitting layer 166. For example, the electron transport layer 167 is disposed on the light emitting layer 166, and the electron injection layer 168 is disposed on the electron transport layer 167, but the invention is not limited thereto. In this embodiment, the first pixel electrode PX1 hole transmission layer 164 can be attached to the hole injection layer 162, and attached to the side walls (not labeled) and the top surface (not labeled) of the retaining wall structures 140, 240. )on. By analogy, the light emitting layer 166 can be attached to the hole transport layer 164, the electron transport layer 167 can be attached to the light emitting layer 166, and the electron injection layer 168 can be attached to the electron transport layer 167. In this way, the above-mentioned multiple thin film layers can be attached to the sidewalls of the retaining wall structures 140 and 240 like the hole injection layer 162 and the hole transmission layer 164.

In this embodiment, the second electrode 190 may be patterned to be multiple. A plurality of second electrodes 190 are located on the electron injection layer 168, and can be respectively arranged corresponding to the pixel units PX1, PX2, PX3. The second electrodes 190 can respectively contact the top surfaces of the retaining wall structures 140, 240, 340, but the invention is not limited thereto. The material of the second electrode 190 may be a transparent conductive material, such as metal oxides such as indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, or indium germanium zinc oxide. In some embodiments, the method for forming the second electrode 190 may be chemical vapor deposition (CVD), physical vapor deposition (PVD), atomic layer deposition (ALD), vapor deposition (VTE), sputtering (SPT) or Its combination. In some embodiments, the second electrode 190 may be a cathode of the pixel units PX1, PX2, PX3.

With the above arrangement, it is possible to adjust the cross-sectional length of the pixel structure 160 of the different pixel units PX1, PX2, PX3 (for example, the length L1 of the cross-section connecting the first surface 191 and the second surface 194, and the first The length L2 of the cross-section of the surface 192 and the second surface 194, the length L3 of the cross-section connecting the first surface 193 and the second surface 194), and L1 is greater than L2 greater than L3, so it can simply achieve different film thickness requirements for different colors of light It can also shorten the manufacturing time of the display panel 10F and save costs if required. In addition, the display panel 10F including the first pixel unit PX1, the second pixel unit PX2, and the third pixel unit PX3 can achieve similar technical effects to the above-mentioned embodiment.

FIG. 9 is a schematic cross-sectional view of a display panel in still another embodiment of the invention. The display panel 10G shown in this embodiment is similar to the display panel 10F shown in FIG. 8, with the main difference being: the electron transport layer 167 of the first pixel unit PX1 except for It can be attached to the light-emitting layer 166 and attached to the side walls (not labeled) of the retaining wall structures 140, 240, and can also contact the top surface (not labeled) of the retaining wall structures 140, 240, 340. For example, a plurality of pixel units PX1, PX2, PX3 can share the same electron transport layer 167 and electron injection layer 168. From another perspective, the electron transport layer 167 may be disposed on the entire surface of the substrate 100, covering the light emitting layer 166 of the plurality of pixel units PX1, PX2, PX3, and covering the barrier structure 140, 240, 340. Similarly, the electron injection layer 168 may also be provided on the entire surface of the substrate 100 to cover the electron transport layer 167.

In addition, the second electrode 190 may also be disposed on the substrate 100 over the entire surface, covering the electron injection layer 168 and covering the barrier structures 140, 240, and 340. In other words, multiple pixel units PX1, PX2, PX3 can share the same layer of the second electrode 190. In this way, the display panel 10G can achieve similar technical effects as the above-mentioned embodiments.

In summary, in the display panel of an embodiment of the present invention, the volume of the retaining wall structure can be adjusted by the display panel, so that the opening can accommodate pixel structures with different film thicknesses as required, so the pixel structure can be placed on the retaining wall. The length of the cross-section on the structure is adjusted to control the overall volume of the pixel structure. Under the above arrangement, the length of the first cross section of the pixel structure of the first pixel unit in the peripheral area may be greater than the length of the second cross section of the pixel structure of the second pixel unit located in the central area. In this way, the opening of the first pixel unit can accommodate more inkjet-coated film droplets than the opening of the second pixel unit in the central area. In this way, the overall volume or thickness of the pixel structure in the first pixel unit located in the peripheral area can be adjusted to be greater than the overall volume or thickness of the pixel structure in the second pixel unit located in the central area. In other words, compared to the second pixel The unit, the retaining wall structure of the first pixel unit can be attached with more pixel structures or accommodate more pixel structures. Therefore, after the drying process, the uniformity of the film thickness of the pixel units located in different regions on the display panel can be consistent, so as to reduce the occurrence of streaks and have uniform brightness and chromaticity.

In addition, because it is possible to adjust and control the cross-sectional length of the pixel unit in the same area or in different areas. Therefore, it is possible to select the same concentration of film droplets for inkjet coating, simply by controlling the number of droplets to achieve different film thickness requirements. In this way, the process can be further simplified, the process time can be shortened, and the cost can be saved. It can also reduce the probability of droplets overflow, increase the tolerance requirements of the manufacturing process, and improve the manufacturing yield of the display panel.

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

10E‧‧‧Display Panel

100‧‧‧Substrate

120、220、320‧‧‧First electrode

127、227、327‧‧‧Top surface

140, 240, 340‧‧‧Retaining wall structure

142, 242, 342‧‧‧ opening

143、243、343‧‧‧Retaining wall side wall

160‧‧‧Pixel structure

162, 162’, 162"‧‧‧hole injection layer

1621, 1623, 1625‧‧‧First surface

1622‧‧‧Second Surface

1624‧‧‧First Section

1624’‧‧‧Second Section

1624"‧‧‧The third section

K1‧‧‧The first line segment

K2‧‧‧Second section

K3‧‧‧third line segment

L1, L2, L3‧‧‧Length

N‧‧‧ direction

PX1‧‧‧The first pixel unit

PX2‧‧‧Second pixel unit

PX3‧‧‧The third pixel unit

T1’, T2’, T3’‧‧‧Thickness

Y1, Y2, Y3‧‧‧Height

Claims (12)

A display panel includes: a substrate; and a plurality of pixel units are arranged on the substrate, each pixel unit includes: a first electrode; a retaining wall structure with an opening, the retaining wall structure having a back A top surface of the substrate and a side wall of the retaining wall, wherein the side wall of the retaining wall of the retaining wall structure is located between the first electrode and the top surface; and a pixel structure is disposed on the first electrode, wherein In a direction perpendicular to the substrate, part of the pixel structure overlaps the retaining wall structure and the opening, and the pixel structure includes a first surface located in the opening, a second surface located on the top surface, and a cross-sectional connection There is a height between the first surface and the second surface, and between the first surface and the top surface of the first electrode, wherein the pixel units include: at least one first pixel unit, the second The pixel structure of a pixel unit has a first cross section and a first height, the length of the first cross section is L1, and the first height is Y1; and at least one second pixel unit, the second picture The pixel structure of the pixel unit has a second cross section and a second height, the length of the second cross section is L2, and the second height is Y2, where L1>L2, and Y1<Y2. The display panel according to claim 1, wherein in a direction perpendicular to the substrate, the first electrode includes a first conductive layer and a second conductive layer vertically stacked on the first conductive layer, the The thickness of the first conductive layer of the first pixel unit is T1, and the thickness of the first conductive layer of the second pixel unit is T2, T2>T1. The display panel according to claim 1, wherein a first angle θ1 is formed between the side wall of the retaining wall of the first pixel unit and the first electrode, and the side wall of the retaining wall of the second pixel unit There is a second angle θ2 with the first electrode, θ1>θ2. The display panel according to claim 1, wherein the first pixel unit further includes a first dielectric pattern disposed between the first electrode and the side wall of the retaining wall, and the retaining wall structure partially covers the The first dielectric pattern, the second pixel unit further includes a second dielectric pattern disposed between the first electrode and the side wall of the barrier, and the barrier structure partially covers the second dielectric pattern. The display panel according to claim 4, wherein in a direction perpendicular to the substrate, the portion where the opening of the first pixel unit overlaps the first dielectric pattern defines a first width D1, and the The portion where the opening of the second pixel unit overlaps the second dielectric pattern defines a second width D2, where the first width D1>the second width D2. According to the display panel described in claim 1, wherein each pixel unit further includes an accommodating space provided between the first electrode and the side wall of the retaining wall, And the capacity of the accommodation space of the first pixel unit is V1, and the capacity of the accommodation space of the second pixel unit is V2, V1>V2. The display panel described in claim 1 further includes an insulating layer disposed between the substrate and the first electrode. The insulating layer has a first height H1 and a second height H2. The first height H1 corresponds to the first pixel unit, the second height corresponds to the second pixel unit, and H2>H1. The display panel according to any one of items 1 to 7 of the scope of patent application, wherein the substrate has a central area and a peripheral area outside the central area, and the second pixel unit is correspondingly disposed in the central area , The first pixel unit is correspondingly arranged in the peripheral area. The display panel according to any one of items 1 to 7 of the scope of patent application, wherein the pixel units further include a third pixel unit, the first pixel unit, the second pixel unit, and The third pixel unit is used for emitting a first color light, a second color light and a third color light respectively. According to the display panel according to claim 9, wherein the pixel structure of the third pixel unit has a third cross section, the length of the third cross section is L3, and L1>L2>L3. The display panel according to claim 1, wherein the pixel structure of each pixel unit further includes: a hole injection layer is disposed on the first electrode; a hole transport layer is disposed on the battery On the hole injection layer; a light-emitting layer is disposed on the hole transport layer; and A second electrode is arranged on the light-emitting layer. The display panel described in item 11 of the scope of patent application further includes: an electron transport layer is disposed on the light emitting layer; and an electron injection layer is disposed on the electron transport layer, wherein the second electrode is located on the electron injection layer And the electron transport layer and the electron injection layer are located between the light-emitting layer and the second electrode.

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