TW202001853A - 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 in particular to a display panel having a retaining wall structure with different section lengths.

With the advancement of technology, flat panel displays are the most attention-grabbing display technology in recent years. Among them, organic light emitting diodes (OLEDs) are due to their self-illumination, no viewing angle dependence, power saving, simple manufacturing process, 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 technology (ink jet printing, IJP) can improve the material utilization rate in the OLED process to reduce costs, but before the ink jet coating needs to form a corresponding pixel set up a bank (bank) to define each A pixel area. However, in the drying process, the evaporation rate of droplets sprayed on the edge of the display is different from that sprayed on the center of the display. Therefore, the uniformity of the thickness of the film formed on the display is poor, resulting in the occurrence of speckles, which causes the brightness and chromaticity of the edge of the display to be significantly different from the center.

The 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 disposed 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 base plate, and a sidewall 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, wherein in the direction perpendicular to the substrate, the pixel structure partially overlaps the retaining wall 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. 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 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 above, the display panel according to an embodiment of the present invention can adjust the volume of the retaining wall structure so that the opening can accommodate pixel structures of different film thicknesses as required, so the pixel structure can be placed on the retaining wall structure The length of the cross-section 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 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, more pixel structures can be attached to the retaining wall structure of the first pixel unit, or the volume of more pixel structures can be accommodated. Therefore, after the drying process is performed, the uniformity of the film thickness of the pixel units located in different areas on the display panel can be uniform, so as to reduce the occurrence of speckle, and have uniform brightness and chromaticity.

In order to make the above-mentioned features and advantages of the present invention more obvious and understandable, the embodiments are specifically described below in conjunction with the accompanying drawings for detailed description as follows.

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 present. As used herein, "connected" may refer to physical and/or electrical connections. Furthermore, "electrical connection" or "coupling" may be that there are other elements between the 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 sections, these elements, components, regions, and/or Or part should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Accordingly, "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 this 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 the relevant technology and the present invention, and will not be interpreted as idealized or excessive Formal meaning unless explicitly defined as such in this article.

FIG. 1 is a schematic top view of a display panel according to an embodiment of the present invention. For convenience of description and observation, FIG. 1 only schematically shows some components. FIG. 2A is a schematic cross-sectional view of the first pixel unit along section line A-A' in FIG. 1. FIG. 2B is a schematic cross-sectional view of the second pixel unit along section line B-B' in FIG. 1. Please refer to FIGS. 1, 2A, and 2B. The display panel 10 of this embodiment is, for example, a self-luminous display panel. In the present embodiment, the display panel 10 is explained 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 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 the pixel units PX in the central area 12 and the peripheral area 14, respectively. In this embodiment, the material of the substrate 100 may be glass, quartz, organic polymer, or opaque/reflective materials (for example: conductive materials, wafers, ceramics, or other applicable materials), or other Applicable materials, the invention is not limited thereto.

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

The pixel unit PX provided on the substrate 100 is, for example, an organic electroluminescence element. Each pixel unit PX includes first electrodes 120, 220, retaining wall structures 140, 240, and pixel structures 160. For example, the first electrodes 120 and 220 may be electrically connected to the thin film transistor, 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), and molybdenum (Mo), magnesium (Mg), platinum (Pt), gold (Au) or a combination thereof. In some embodiments, the material of the first electrodes 120, 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 invention is not limited thereto. The first electrodes 120, 220 may have a single layer, double layer, or multilayer structure. For example, the first electrodes 120, 220 may include first conductive layers 122, 222 and second conductive layers 124, 224. In this embodiment, the first electrodes 120 and 220 further include third conductive layers 126 and 226. Hereinafter, the first electrode 120 and 220 will be described as a three-layer structure.

In this embodiment, in the direction perpendicular to the substrate 100, the first electrodes 120, 220 include first conductive layers 122, 222 disposed on the substrate 100, and second conductive layers stacked vertically on the first conductive layers 122, 222 The layers 124, 224 and the third conductive layers 126, 226 stacked vertically on the second conductive layers 124, 224. 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 be a three-layer structure composed of Ti/Al/Ti and Mo/Al/Mo. In other embodiments, the first electrodes 120 and 220 may further include reflective electrodes, and the material may be a metal that has good reflectivity to visible light, such as aluminum, molybdenum, gold, or a combination thereof. In some embodiments, the first electrode 120, 220 may be formed by 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 retaining 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 retaining wall structures 140 and 240 may be hydrophobic materials, for example, a negative photoresist containing fluorine 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 sidewalls of the retaining wall structures 140 and 240 by forming openings 142 and 242. The method for forming the openings 142 and 242 includes yellow photolithography etching method or other suitable methods. In this embodiment, the retaining wall structures 140, 240 have top surfaces 141, 241 and retaining wall side walls 143, 243 that are away from and facing away from the substrate 100. The side walls 143 and 243 of the retaining wall are located between the first electrodes 120 and 240 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 240 and the top surfaces 141 and 241, but the invention is not limited thereto. From another point of view, the barrier structures 140 and 240 that define the area of the pixel unit PX can be formed by forming the openings 142 and 242 and the barrier side walls 143 and 243. In this embodiment, the space in the openings 142 and 242 can be used to accommodate the material of the inkjet-coated organic light-emitting diode and fix it well in it.

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 invention is not limited thereto. In this embodiment, the pixel structure 160 includes, for example, a hole injection layer 162, a hole transmission layer 164 (shown in FIG. 8), and a light emitting layer 166 (shown in FIG. 8). The pixel unit PX further 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 copper, star arylamines, polyaniline, polyethylene dioxythiophene, or other suitable materials. The material of the hole transport layer 164 is, for example, triaromatic amines, cross-structure diamine biphenyl, diamine biphenyl 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 different color (for example, white, orange, yellow, etc.) light-emitting pattern generated by mixing light of various spectra. In other words, different pixel units PX can respectively emit colored lights of different colors. In some embodiments, different pixel units PX may also emit colored light of the same color, and the invention is not limited thereto. The material of the electron transport layer 167 may be oxazole derivatives and their dendrimers, metal chelates (such as Alq3), azole compounds, diazoanthracene derivatives, silicon-containing heterocyclic compounds, or other suitable materials.

In this embodiment, in order to increase the utilization rate of the material and reduce the manufacturing cost of the pixel unit PX, the pixel structure 160 may be formed by an ink jet printing process (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; 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. The difference between the surface tension of the liquid and the adsorption force of the side walls 143 and 243 of the retaining wall will cause the film thickness to be uneven in the droplet drying process. Therefore, the thickness of the hole injection layer 162 formed by the above process increases with the distance 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 may 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, the pixel structure 160 partially overlaps the barrier 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 may be accommodated in the openings 142, 242 with heights Y1, Y2, and part of the pixel structure 160 may be Formed on the top surfaces 141, 241 of the retaining wall structures 140, 240. In addition, some pixel structures 160 may be attached to the sidewalls 143 and 243 of the retaining walls 140 and 240 based on the surface tension of the liquid. In this embodiment, the pixel structure 160 has first surfaces 1621, 1623 in the openings 142, 242, respectively, and second surfaces 1622 on the top surfaces 141, 241 of the retaining wall structures 140, 240. As shown in FIG. 2A, the height Y1 may be defined as, for example, in the direction N perpendicular to the substrate 100, from the first surface 1621 in the center of the opening 142 (eg, the flat surface of the pixel structure 160 in the opening 142 shown in FIG. 2A) to The vertical distance of 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 (eg, 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, 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 wall 143 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 correspondingly disposed in the peripheral region 14, and the second pixel unit PX2 is correspondingly disposed in the central region 12, and the peripheral region 14 surrounds the central region 12. However, the invention is not limited to this. It should be noted here that FIG. 1 only schematically illustrates one first pixel unit PX1 and one second pixel unit PX2. However, in practice, the first pixel unit PX1 and the second pixel unit PX2 are 100,000, 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 graphics shown in FIG. 1, but depend on the needs of users.

It is worth noting that please refer 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. The length of the first cross-section 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 along the retaining wall side wall 143 to the first surface 1621. 1 and 2B, the pixel structure 160 of the second pixel unit PX2 in the central area 12 has a second cross-section 1624'. The second section 1624' is connected between the first surface 1623 and the second surface 1622. The length of the second section 1624' is L2, and the length L2 of the second section 1624' can be defined as the distance extending from the second surface 1622 along the retaining wall side wall 143 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 cross-section K2. The second section K2 may 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 cut line segment K1 of the sidewall 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, and 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, 220 can also be achieved by adjusting the second conductive layers 124, 224 or the third conductive layers 126, 226. Thereby, 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 tangent segment K1 of the retaining wall side wall 143 is greater than the length of the second tangent segment K2 of the retaining wall side wall 243. In other words, when the overall height of the display panel 10 is the same, the distance between the top surface 141 of the retaining wall structure 140 of the first pixel unit PX1 and the top surface 127 of the first electrode 120 is 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. That is, 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 absorbed by the retaining wall structure 140 of the first pixel unit PX1 may be larger than the volume of the pixel structure 160 absorbed by the retaining 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 also 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 the first pixel unit PX1 and the second pixel unit PX2 are formed using the same pixel structure 160 (for example: the same number of hole injection layers 162), the first The height Y1 of the pixel structure 160 in the pixel unit PX1 will be 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 section 1624 can be greater than the length L2 of the second section 1624. From another perspective, a longer cross-section may represent that the pixel unit still 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 in the peripheral area 14 can accommodate more inkjet-coated liquid hole injection layer 162, or accommodate more The hole transport layer 164 (shown in FIG. 8) or the light-emitting layer 166 (shown in FIG. 8) are also applied through inkjet coating. Based on the above, the overall thickness of each film layer of the first pixel unit PX1 located in the peripheral region 14 can be further set greater than the overall thickness of each film layer of the second pixel unit PX2 located in the central region 12. In other words, during the drying process, the first pixel unit PX1 with a smaller film thickness (but can absorb more pixel structures 160 on the side wall 143 of the retaining wall) can be located in the peripheral region 14 with a high volatilization rate, and The second pixel unit PX2 with a larger film thickness (but less pixel structure 160 adsorbed on the side wall 143 of the retaining wall) may be located in the central region 12 with a low volatilization rate. Therefore, after volatilization in the drying process, the uniformity of the film thickness of the pixel units PX (including the first pixel unit PX1 and the second pixel unit PX2) in different areas on the display panel 10 can be reduced to reduce speckle Produced, with more uniform brightness and chroma.

In addition, since the cut-off sections K1 and K2 of the retaining wall structures 140 and 240 of the display panel 10 in the central area 12 or the peripheral area 14 can be adjusted, the pixel structure of the first pixel unit PX1 and the second pixel unit PX2 can be controlled The lengths L1 and L2 of the first section 1624 and the second section 1624' of 160. Therefore, when performing inkjet coating, the thickness of each film layer can be controlled by adjusting the droplet concentration of each film layer without using a conventional process, and the first pixel unit PX1 and the second image can be simply adjusted by The number of droplets in the element unit PX2 to control the film thickness further simplifies the process, shortens the process time and saves costs. In addition, by adjusting the retaining wall structure 140, 240, the space in the openings 142, 242 matches the required number of droplets, so in inkjet coating, the probability of droplet overflow can also be reduced, increasing the tolerance requirements of the process and increasing The manufacturing yield of the display panel 10.

The following embodiments continue to use the element numbers and partial contents of the previous embodiments, wherein the same reference numerals are used to denote the same or similar elements. For the description of the parts that omit the same technical content, please refer to the previous embodiments. Repeat the details.

3A is a schematic cross-sectional view of a first pixel unit of a display panel according to another embodiment of the invention. 3B is a schematic cross-sectional view of a second pixel unit of a display panel according to 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, and the main difference is that there is a first angle between the side wall 143A of the first pixel unit PX1A and the first electrode 120 θ1, there is a second angle θ2 between the side wall 243A of the second pixel unit PX2A and the first electrode 220, and θ1>θ2. Under the above configuration, the absolute value of the slope of the side wall 143A of the retaining wall structure 140A of the first pixel unit PX1A will be 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 retaining wall is closer to the substrate 100 than the side wall 143A of the retaining 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 sidewall 143A with a lower absolute slope value may be greater than that of the retaining wall sidewall 243A with a higher absolute slope value 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 larger than the volume in the second pixel unit PX2A. The length L1A of the first cross-section 1624A connecting the first surface 1621A and the second surface 1622A between the first pixel unit PX1A and the pixel structure 160 (eg, the hole injection layer 162A) may be larger than that of the second pixel unit PX2A The length L2A of the second cross-section 1624B connecting the first surface 1623B and the second surface 1622B between the pixel structure 160 (eg, the hole injection layer 162B). In this way, the overall volume of the pixel structure 160 can be controlled by adjusting the lengths of the cross-sections of the pixel structure 160 on the retaining wall structures 140A and 240A.

In this embodiment, except for the space in the opening 142A of the retaining wall structure 140A of the first pixel unit PX1A may be larger than the space in the opening 242A of the retaining wall structure 240A of the second pixel unit PX2A, the retaining wall side wall 143A The adsorption force of the can also be greater than the adsorption force of the retaining wall side wall 243A to 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 with 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 the volume of more pixel structures 160 is attached to the side wall 143A of the retaining wall or accommodated in the opening 142A, so that the first The display panel 10A of the pixel unit PX1A and the second pixel unit PX2A can obtain technical effects similar to those of the foregoing embodiments.

4A is a schematic cross-sectional view of a first pixel unit of a display panel according to 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 a second pixel unit of a display panel according to another embodiment of the invention. The display panel 10B 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 PX1B further includes a first dielectric pattern 180 disposed on the first electrode 120 and the barrier Between the wall sidewalls 143 and the second pixel unit PX2B further includes a second dielectric pattern 280 disposed between the first electrode 220 and the retaining wall sidewall 243. As shown in FIGS. 4A and 4B, the retaining wall structure 140 partially covers the first dielectric pattern 180, and the retaining wall 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, while 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 directly exposed by the openings 142B, 242B (also can be regarded as Overlapping the openings 142B, 242B) 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 may define the first width D1. Specifically, the first width D1 may be defined as: in a direction N perpendicular to the substrate 100, from the boundary 181 where the sidewall 143 contacts the first dielectric pattern 180 to the position where the first dielectric pattern 180 is located in the opening 142B The distance of surface 183. In addition, a 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 may be defined as: in the direction N perpendicular to the substrate 100, from the junction 281 where the sidewall 243 of the barrier wall contacts the second dielectric pattern 280 to the position where the second dielectric pattern 280 is located in the opening 242B Surface 283 distance. In this embodiment, the first width D1>the second width D2. From another perspective, the first width D1 of the first dielectric pattern 180 generally refers to a distance that exceeds the width of the side wall 143 of the retaining wall structure 140 in the direction parallel to the substrate 100, and the second dielectric The second width D\2 of the pattern 280 generally refers to the distance beyond the width of the side wall 243 of the retaining wall structure 240 of the retaining wall structure 240 in the direction parallel to the substrate 100.

Under the above configuration, the opening 142B of the first pixel unit PX1B overlaps the first width D1 of the first dielectric pattern 180 more than the second pixel unit PX2B in the direction N perpendicular to the substrate 100 (for example : More of the first width D1 of the first dielectric pattern 180 is exposed, and the opening 242B overlaps the second width D2 of the second dielectric pattern 280 less than the first pixel unit PX1B (for example: less exposure 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 to the liquid may be greater than the adsorption force of the second dielectric pattern 280 of the second pixel unit PX2B to the 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) 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 on the first surface 1621 of the pixel structure 160 (eg, the hole injection layer 162A), so that the height of the hole injection layer 162A of the first pixel unit PX1B can be further increased 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, the length L1B of the first cross-section 1624A can be ensured to be 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, the display panel 10B including the first pixel unit PX1B and the second pixel unit PX2B can also obtain technical effects similar to those of the foregoing embodiments.

In some embodiments, as shown in FIG. 4C, there may not be a dielectric pattern in the opening 242B (for example: the second dielectric pattern 280 shown in FIG. 4B). Under the above configuration, compared with 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' adsorbs the liquid The side wall 143 of the retaining wall is smaller than the first pixel unit PX1B. As such, the length L2B' of the second cross-section 1624B' connected between the first surface 1623B' and the second surface 1622B' may be smaller than the length L1B of the first cross-section 1624A. In addition, in this embodiment, compared with 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 obtain technical effects similar to those of the above-described embodiment. In addition, in other embodiments, the second pixel units PX2B, PX2B' may also be provided in the central area 12 (shown in FIG. 1) of the display panel 10B to further adjust the pixel units PX1B on the display panel 10B , PX2B, PX2B' overall film thickness uniformity, but the present invention is not limited thereto.

5A is a schematic cross-sectional view of a first pixel unit of a display panel according to another embodiment of the invention. 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 accommodating 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 accommodating 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, and the capacity of the accommodation space 244C of the second pixel unit PX2C is V2, and V1>V2. Under 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 with the second pixel unit PX2C shown in FIG. 5B, a larger volume of the hole injection layer 162A can fill the accommodating space 144C in the opening 142C of the first pixel unit PX1C. In some embodiments, since the accommodating space of the accommodating space 144C may be larger than the volume of the hole injection layer 162A, the hole injection layer 162A may 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. As such, the length L1C of the first cross-section 1624A of the first pixel unit PX1C may 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 adsorb more pixels The volume of structure 160. In addition, the display panel 10C including the first pixel unit PX1C and the second pixel unit PX2C can also obtain technical effects similar to those of the foregoing embodiments.

6A is a schematic cross-sectional view of a first pixel unit of a display panel according to 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 is similar to the display panel 10 shown in FIGS. 2A and 2B. The main difference is that the display panel 10D further includes insulating layers 110 and 210 respectively disposed on the substrate 100 and the corresponding pixel unit PX1D , Between 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 this The invention is not limited to this. In this embodiment, the insulating layer 110 and the insulating layer 210 are, for example, integrally formed insulating layers, and the insulating layer 110 corresponding to the first pixel unit PX1D has a first height H1 and corresponds to the second pixel unit 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 invention is not limited thereto. 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 241D is located on the same plane and cut, the length of the first tangent segment K1 of the retaining wall side wall 143D may be greater than the length of the second tangent segment K2 of the retaining wall side wall 243D. 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 accommodate or absorb more volume of the pixel structure 160. In addition, the display panel 10D including the first pixel unit PX1D and the second pixel unit PX2D can obtain technical effects similar to those of the foregoing embodiments.

7 is a schematic cross-sectional view of a display panel according to 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 first color light, second color light, and 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 one of the first colored light, the second colored light, and the third colored light may also be colored light of the same color.

It is worth noting that the retaining wall structure 340 of the third pixel unit PX3 has an opening 342 and a retaining wall side wall 343. The retaining wall side wall 343 has, for example, a third section K3. In this embodiment, when the overall height of the display panel 10E is the same, since the thickness T1' of the first electrode 120 of the first pixel unit PX1 is less 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 cross-section K1 is greater than the length of the second cross-section K2 than the length of the third cross-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 of the third cross-section 1624" (defined as the distance from the first surface 1625 to the second surface 1622). As such, the height Y1 of the hole injection layer 162 of the first pixel unit PX1 (defined as the distance from the first surface 1621 to the top surface 127) is smaller than the height Y2 (definition of the hole injection layer 162' of the second pixel unit PX2 The distance from the first surface 1623 to the top surface 227) is smaller than the height Y3 of the hole injection layer 162'' of the third pixel unit PX3 (defined as the distance from the first surface 1625 to the top surface 327). However, the invention is not limited to this. Those of ordinary skill in the art should understand that as long as any one of the cross-sectional lengths L1, L2, and L3 is different from the other two, the pixel structure 160 of any of the pixel units PX1, PX2, and PX3 The film thickness can be adjusted to be different from the other two. In this way, the hole injection layers 162, 162', 162'' (or other films) 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 Layer). Therefore, in inkjet coating, the overall film thickness of different pixel units PX1, PX2, and PX3 can be controlled by separately adjusting the droplet concentration of each film layer without using a conventional process. 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 further simplifies the manufacturing process, shortens the manufacturing time and saves costs.

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

In short, since the display panel 10E can adjust the volume of the retaining wall structures 140, 240, and 340, the openings 142, 242, and 342 can accommodate pixel structures 160 with different film thicknesses as required. The pixels can be controlled by adjusting the lengths L1, L2, L3 of the cross-sections of the pixel structure 160 on the retaining wall structures 140, 240, 340 (eg, the first cross-section 1624, the second cross-section 1624', the third cross-section 1624'') The overall volume of structure 160. In this way, droplets of the same concentration can be selected for inkjet coating to achieve different thickness requirements. In this way, the manufacturing process of the display panel 10E can be simplified and the cost can be saved, and the film thickness of the pixel units of different colors (for example: the pixel units PX1, PX2, PX3) can be adjusted according to the requirements to reduce the occurrence of speckles and have a more uniform Brightness and chroma.

8 is a schematic cross-sectional view of a display panel in still another embodiment of the present invention. The display panel 10F shown in this embodiment is similar to the display panel 10E shown in FIG. 7, the main difference is that each pixel unit PX1, PX2, PX3 further includes a hole transmission 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 wall (not marked) and the top surface (not marked) of the wall structure 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 side walls 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 into a plurality. A plurality of second electrodes 190 are located on the electron injection layer 168, and can be disposed corresponding to the pixel units PX1, PX2, and PX3, respectively. These second electrodes 190 may contact the top surfaces of the barrier wall structures 140, 240, and 340, respectively, but the invention is not limited thereto. The material of the second electrode 190 may be a transparent conductive material, such as indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide or indium germanium zinc oxide. In some embodiments, the formation method of 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, and PX3.

Under the above configuration, since the length of the cross section of the pixel structure 160 of different pixel units PX1, PX2, PX3 can be adjusted (for example: the length L1 of the cross section connecting the first surface 191 and the second surface 194, the first The length L2 of the cross section of the surface 192 and the second surface 194, and the length L3 of the cross section connecting the first surface 193 and the second surface 194), and L1 is greater than L2 and greater than L3, so it is easy to achieve different film thicknesses required by different colored lights Demand can also shorten the manufacturing time of the display panel 10F and save costs. In addition, the display panel 10F including the first pixel unit PX1, the second pixel unit PX2, and the third pixel unit PX3 can obtain technical effects similar to those of the foregoing embodiments.

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

In addition, the second electrode 190 may also be provided on the substrate 100 over the entire surface, covering the electron injection layer 168 and covering the barrier structure 140, 240, 340. In other words, the plurality of pixel units PX1, PX2, and PX3 may share the second electrode 190 of the same layer. In this way, the display panel 10G can obtain technical effects similar to those of the foregoing embodiments.

In summary, in the display panel according to an embodiment of the present invention, since the display panel can adjust the volume of the retaining wall structure so that the opening can accommodate pixel structures of different film thicknesses as required, 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 layer droplets than the opening of the second pixel unit in the central region. 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 unit, the first pixel unit can have more pixel structures attached to the retaining wall structure, or can accommodate more pixel structure volume. Therefore, after the drying process is performed, the uniformity of the film thickness of the pixel units located in different areas on the display panel can be uniform, so as to reduce the occurrence of speckle, and have uniform brightness and chromaticity.

In addition, the length of the cross section of the pixel unit in the same area or in different areas can be adjusted and controlled. Therefore, the droplets of the film layer with the same concentration can be selected 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 costs can be saved. It can also reduce the probability of droplet overflow, increase the tolerance requirements of the manufacturing process and increase the manufacturing yield of the display panel.

Although the present invention has been disclosed as above with examples, it is not intended to limit the present invention. Any person 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 subject to the scope defined in the appended patent application.

10, 10A, 10B, 10C, 10D, 10E, 10F ‧‧‧ display panel 12‧‧‧Central 14‧‧‧ surrounding area 100‧‧‧ substrate 110、210‧‧‧Insulation 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, 340 127, 141, 141A, 141D, 227, 241, 241A, 241D, 327 142, 142A, 142B, 142C, 142D, 242, 242A, 242B, 242C, 242D, 342‧‧‧ opening 143, 143A, 143C, 143D, 243, 243A, 243C, 243D, 343 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 1622, 1622A, 1622B, 1622B’, 194‧‧‧ second surface 1624, 1624A, 1624B, 1624B’‧‧‧‧ 1624’‧‧‧second section 1624’’‧‧‧third section 164‧‧‧Electric tunnel transmission layer 166‧‧‧luminous layer 167‧‧‧Electronic transmission layer 168‧‧‧Electron injection layer 180‧‧‧First dielectric pattern 181, 281‧‧‧ Junction 183, 286‧‧‧ inner surface 190‧‧‧Second electrode 280‧‧‧Second dielectric pattern A-A’, B-B’ ‧‧‧ hatch D1‧‧‧First width D2‧‧‧second width H1‧‧‧ First height H2‧‧‧second height K1, K1A‧‧‧The first section K2, K2A‧‧‧Second section K3‧‧‧The third section L1, L1A, L1B, L1C, L1D, L2, L2A, L2B, L2B’, L2C, L2D, L3 N‧‧‧ direction PX‧‧‧Pixel unit PX1, PX1A, PX1B, PX1C, PX1D‧The first pixel unit PX2, PX2A, PX2B, PX2B’, PX2C, PX2D ‧‧‧ second pixel unit PX3‧‧‧third pixel unit T1, T2, T1’, T2’, T3’‧‧‧ Thickness V1, V2‧‧‧Capacity Y1, Y2, Y2’, Y3, YA, YB, YC‧‧‧ Height θ1‧‧‧First angle θ2‧‧‧Second Angle

FIG. 1 is a schematic top view of a display panel according to an embodiment of the invention. FIG. 2A is a schematic cross-sectional view of the first pixel unit along section line A-A' in FIG. 1. FIG. 2B is a schematic cross-sectional view of the second pixel unit along section line B-B' in FIG. 1. 3A is a schematic cross-sectional view of a first pixel unit of a display panel according to another embodiment of the invention. 3B is a schematic cross-sectional view of a second pixel unit of a display panel according to another embodiment of the invention. 4A is a schematic cross-sectional view of a first pixel unit of a display panel according to 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 a second pixel unit of a display panel according to another embodiment of the invention. 5A is a schematic cross-sectional view of a first pixel unit of a display panel according to another embodiment of the invention. 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 according to 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. 7 is a schematic cross-sectional view of a display panel according to another embodiment of the invention. 8 is a schematic cross-sectional view of a display panel in still another embodiment of the present invention. 9 is a schematic cross-sectional view of a display panel in still another embodiment of the present invention.

10E‧‧‧Display panel

100‧‧‧ substrate

120、220、320‧‧‧First electrode

127, 227, 327

140, 240, 340‧‧‧ retaining wall structure

142, 242, 342‧‧‧ opening

143, 243, 343

160‧‧‧Pixel structure

162, 162’, 162” ‧‧‧ hole injection layer

1621, 1623, 1625 ‧‧‧ first surface

1622‧‧‧Second surface

1624‧‧‧The first section

1624’‧‧‧second section

1624”‧‧‧third section

K1‧‧‧The first section

K2‧‧‧Second Section

K3‧‧‧The third section

L1, L2, L3 ‧‧‧ long

N‧‧‧ direction

PX1‧‧‧The first pixel unit

PX2‧‧‧Second pixel unit

PX3‧‧‧third pixel unit

T1’, T2’, T3’‧‧‧ Thickness

Y1, Y2, Y3 ‧‧‧ height

Claims (12)

A display panel, including: A substrate; and A plurality of pixel units are disposed on the substrate, and each pixel unit includes: A first electrode; A retaining wall structure having an opening, the retaining wall structure having a top surface facing away from the substrate and a retaining wall side wall, wherein the retaining wall side wall of the retaining wall structure is located between the first electrode and the top surface; as well as A pixel structure is disposed on the first electrode, wherein in a direction perpendicular to the substrate, the pixel structure partially overlaps the retaining wall structure and the opening, and the pixel structure includes a first surface at the opening Inner and a second surface are located on the top surface and a cross section is connected between the first surface and the second surface, The pixel units include: At least one first 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; and At least one second pixel unit, the pixel structure of the second pixel unit has a second cross section, the length of the second cross section is L2, Where L1>L2. The display panel according to item 1 of the patent application scope, wherein in a direction perpendicular to the substrate, the first electrode includes a first conductive layer and a second conductive layer stacked vertically 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, and T2>T1. The display panel as described in item 1 of the patent application range, wherein the side wall of the first pixel unit and the first electrode have a first angle θ1, and the side wall of the second pixel unit There is a second angle θ2 with the first electrode, θ1>θ2. The display panel as described in Item 1 of the patent application range, wherein the first pixel unit further includes a first dielectric pattern disposed between the first electrode and the sidewall of the retaining wall, and the retaining wall structure partially covers the In the first dielectric pattern, the second pixel unit further includes a second dielectric pattern disposed between the first electrode and the sidewall of the retaining wall, and the retaining wall structure partially covers the second dielectric pattern. The display panel as described in item 4 of the patent application scope, wherein a portion of the opening of the first pixel unit overlapping the first dielectric pattern in a direction perpendicular to the substrate 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. The display panel as described in item 1 of the patent application scope, wherein each of the pixel units further includes a receiving space disposed between the first electrode and the side wall of the retaining wall, and the volume of the first pixel unit The capacity of the storage space is V1, the capacity of the storage space of the second pixel unit is V2, and V1>V2. The display panel as described in item 1 of the patent application scope further includes an insulating layer disposed between the substrate and the first electrode, the insulating layer having 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 claims 1 to 7, wherein the substrate has a central area and a peripheral area other than the central area, and the second pixel unit is correspondingly disposed in the central area , The first pixel unit is correspondingly disposed in the peripheral area. The display panel according to any one of items 1 to 7 of the patent application scope, wherein the pixel units further include a third pixel unit, the first pixel unit, the second pixel unit and The third pixel unit respectively emits a first color light, a second color light and a third color light. The display panel as described in item 9 of the patent application scope, 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 as described in item 1 of the patent application scope, wherein the pixel structure of each pixel unit further includes: A hole injection layer is provided on the first electrode; A hole transmission layer is arranged on the hole injection layer; A light-emitting layer is disposed on the hole transmission layer; and A second electrode is disposed on the light-emitting layer. The display panel as described in item 11 of the patent application scope further includes: An electron transport layer is provided on the light-emitting layer; and An electron injection layer is provided on the electron transport layer, 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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