Display device

Abstract

The invention provides a display device. The display panel comprises a substrate, a light-emitting element and a retaining wall structure. The light-emitting element is jointed on the substrate and is provided with a light-emitting surface opposite to the substrate, and a first edge and a second edge which are intersected with each other. A length of the first edge along the first direction is greater than a length of the second edge along the second direction. The retaining wall structure is arranged on the substrate and surrounds the light-emitting element. The retaining wall structure has a first portion and a second portion. The first portion is arranged opposite to the first edge of the light-emitting element along the second direction. The second portion is arranged opposite to the second edge of the light-emitting element along the first direction. The first part and the second part of the retaining wall structure are respectively provided with a first top surface and a second top surface which are back to the substrate. In the normal direction of the light-emitting surface, the first top surface is lower than the light-emitting surface, and the second top surface is higher than the light-emitting surface.

Description

Technical Field

[0001] The present invention relates to a display device, and more particularly to a display device provided with a light-emitting element. Background Art

[0002] In a self-luminous display device, in addition to forward light emission, the light-emitting element may also emit light laterally. In order to increase the frontal brightness of the display device, in addition to improving the light-emission efficiency of the light-emitting element itself, a concept of guiding the lateral light emitted by the light-emitting element to the forward light-emitting surface for emission has been proposed.

[0003] For example, a barrier structure with a high reflectivity can be covered on the lateral light-emitting surface of the light-emitting element to reflect the lateral light and increase the probability of its emission from the forward light-emitting surface. Generally, by designing the height of the barrier structure to be higher than the light-emitting surface of the light-emitting element, the reuse rate of the lateral light can be maximized. However, the optical effects of the respective film layers on the barrier structure are also likely to deteriorate due to the positional deviation generated during the bonding process of the light-emitting element and the substrate. Summary of the Invention

[0004] The present invention provides a display device that can balance light-emission efficiency and color performance.

[0005] The display device of the present invention includes a substrate, a light-emitting element, and a barrier structure. The light-emitting element is bonded to the substrate and has a light-emitting surface facing away from the substrate, and a first edge and a second edge defining the light-emitting surface. The first edge and the second edge extend in a first direction and a second direction, respectively. The length of the first edge along the first direction is greater than the length of the second edge along the second direction. The first direction and the second direction are parallel to the substrate surface of the substrate and intersect with each other. The barrier structure is disposed on the substrate and surrounds the light-emitting element. The barrier structure has a first portion and a second portion. The first portion is disposed opposite to the first edge of the light-emitting element along the second direction. The second portion is disposed opposite to the second edge of the light-emitting element along the first direction. The first portion and the second portion of the barrier structure respectively have a first top surface and a second top surface facing away from the substrate. In the normal direction of the substrate surface, the first top surface is lower than the light-emitting surface of the light-emitting element, and the second top surface is higher than the light-emitting surface of the light-emitting element.

[0006] Based on the above, in the display device according to an embodiment of the present invention, the light-emitting element disposed on the surface of the substrate has a first edge and a second edge that define a light-emitting surface and whose extending directions intersect each other, and the length of the first edge is greater than the length of the second edge. The barrier structure disposed around the light-emitting element has a first portion and a second portion disposed opposite to the first edge and the second edge of the light-emitting element respectively. Since the second top surface of the second portion of the barrier structure is higher than the light-emitting surface of the light-emitting element, the light extraction efficiency of the light-emitting element can be effectively improved. On the other hand, by making the first top surface of the first portion of the barrier structure lower than the light-emitting surface of the light-emitting element, the large viewing angle color shift caused by the position deviation when the light-emitting element is bonded to the substrate can be significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 is a front view schematic diagram of a display device according to a first embodiment of the present invention.

[0008] Figure 2A and Figure 2B is Figure 1 an enlarged schematic diagram of a partial area of the display device.

[0009] Figure 3A and Figure 3B is Figure 2A a cross-sectional schematic diagram of the display device.

[0010] Figure 4 is Figure 2A an enlarged schematic diagram of a partial area of the display device.

[0011] Figures 5A to 5J and Figures 6A to 6J is Figure 3A and Figure 3B a cross-sectional schematic diagram of the manufacturing process of the display device.

[0012] Figure 7 is a cross-sectional schematic diagram of a display device according to a second embodiment of the present invention.

[0013] Figure 8 is a cross-sectional schematic diagram of a display device according to a third embodiment of the present invention.

[0014] Figure 9 is a cross-sectional schematic diagram of a display device according to a fourth embodiment of the present invention.

[0015] Figure 10 is a cross-sectional schematic diagram of a display device according to a fifth embodiment of the present invention.

[0016] Figure 11 is a cross-sectional schematic diagram of a display device according to a sixth embodiment of the present invention.

[0017] Figure 12A cross-sectional schematic view of a display device according to a seventh embodiment of the present invention

[0018] The reference numerals are explained as follows:

[0019] 10, 10A, 10B, 10C, 10D, 10E, 10F: Display device

[0020] 100: Substrate

[0021] 100s: Substrate surface

[0022] 105: Bonding pad

[0023] 110: Pixel definition layer

[0024] 115: Passivation layer

[0025] 120, 121, 122, 123: Light-emitting element

[0026] 120e1: First edge

[0027] 120e2: Second edge

[0028] 120e3: Third edge

[0029] 120e4: Fourth edge

[0030] 120es1: Forward light-emitting surface

[0031] 120es2: Side light-emitting surface

[0032] 140: Barrier structure

[0033] 140p1: First part

[0034] 140p2: Second part

[0035] 140ts1: First top surface

[0036] 140ts2: Second top surface

[0037] 141: First barrier

[0038] 141M: First barrier material layer

[0039] 142: Second barrier

[0040] 142M: Second barrier material layer

[0041] 160: Light-transmitting layer

[0042] 160M: Light-transmitting material layer

[0043] 165: Scattering layer

[0044] 168: Color conversion layer

[0045] 170: Light-shielding structure

[0046] 171: First light-shielding layer

[0047] 171M: First light-shielding material layer

[0048] 172: Second light-shielding layer

[0049] 172M: Second light-shielding material layer

[0050] 171e1, 171e2, 172e1, 172e2: Light-shielding edges

[0051] 180: Encapsulation layer

[0052] 190: Filter layer

[0053] 195, 195A, 195B: Lens structure

[0054] d1~d4: Distances

[0055] E1: First electrode

[0056] E2: Second electrode

[0057] H1, H2: Heights

[0058] L1~L4: Lengths

[0059] LEL: Light-emitting layer

[0060] OP1, OP2, OP2a, OP2b: Openings

[0061] PA: Pixel area

[0062] SCL1: First-type semiconductor layer

[0063] SCL2: Second-type semiconductor layer

[0064] TA: Translucent area

[0065] X, Y, Z: Directions

[0066] A-A’, B-B’: Cutting lines Detailed implementation manners

[0067] As used herein, "about," "approximate," "substantially," or "essentially" includes the stated value and the average within an acceptable deviation range of a particular value as determined by one of ordinary skill in the art, taking into account the particular amounts of the measurements and the errors associated with the measurements (i.e., the limitations of the measurement system). For example, "about" can mean within one or more standard deviations of the stated value, or, for example, within ±30%, ±20%, ±15%, ±10%, or ±5%. Moreover, "about," "approximate," "substantially," or "essentially" as used herein can be selected based on the nature of the measurement, the nature of the cut, or other properties, to select a more acceptable deviation range or standard deviation, rather than applying one standard deviation to all properties.

[0068] In the figures, for clarity, the thicknesses of layers, films, panels, regions, etc. are exaggerated. 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 intervening elements may also be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, no intervening elements are present. As used herein, "connected" can refer to physical and / or electrical connection. Moreover, "electrical connection" can be such that other elements are present between two elements.

[0069] In addition, relative terms such as "lower" or "bottom" and "upper" or "top" may be used herein to describe the relationship of one element to another element, as shown in the figures. It should be understood that relative terms are intended to encompass different orientations of the device in addition to the orientation shown in the figures. For example, if the device in one figure is flipped, an element described as being on the "lower" side of another element will be oriented on the "upper" side of the other element. Thus, the exemplary term "lower" can include both the "lower" and "upper" orientations, depending on the particular orientation of the figure. Similarly, if the device in one figure is flipped, an element described as being "beneath" or "below" another element will be oriented as being "above" the other element. Thus, the exemplary terms "above" or "below" can include both the above and below orientations.

[0070] Exemplary embodiments are described herein with reference to cross-sectional views that are schematic illustrations of idealized embodiments. Accordingly, variations in the shapes of the illustrations as a result of, for example, manufacturing techniques and / or tolerances are to be expected. Thus, the embodiments described herein should not be construed as being limited to the particular shapes of regions as shown herein, but rather include, for example, shape variations resulting from manufacturing. For example, regions shown or described as flat will generally have rough and / or non-linear features. In addition, the sharp angles shown may be rounded. Thus, the regions shown in the figures are essentially schematic in nature, and their shapes are not intended to illustrate the precise shape of a region and are not intended to limit the scope of the claims.

[0071] Reference will now be made in detail to exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Whenever possible, the same reference numerals are used in the drawings and the description to refer to the same or like parts.

[0072] Figure 1 is a front view schematic diagram of a display device according to a first embodiment of the present invention. Figure 2A and Figure 2B is Figure 1 an enlarged schematic diagram of a partial area of the display device. Figure 3A and Figure 3B is Figure 2A a cross-sectional schematic diagram of the display device. Figure 4 is Figure 2A an enlarged schematic diagram of a partial area of the display device. Figures 5A to 5J and Figures 6A to 6J is Figure 3A and Figure 3B a cross-sectional schematic diagram of the manufacturing process of the display device. Figure 3A Corresponding to Figure 2A and Figure 2B the cutting line A-A'. Figure 3B Corresponding to Figure 2A and Figure 2B the cutting line B-B'. For the sake of clear presentation, Figure 2B the illustration of the light-shielding structure 170 in Figure 2A is omitted.

[0073] Please refer to Figure 1 and Figure 2A , the display device 10 includes a substrate 100 and a plurality of light-emitting elements 120. In this embodiment, the substrate 100 is, for example, a circuit board provided with a pixel circuit layer (not shown) and a plurality of bonding pads 105, and the light-emitting elements 120 are adapted to be bonded to the bonding pads 105 to electrically connect to the substrate 100. The plurality of light-emitting elements 120 can be respectively bonded within a plurality of pixel regions PA on the substrate 100 and constitute a plurality of display pixels of the display device 10. In this embodiment, three light-emitting elements 120 of different light-emitting colors (such as red, green, and blue, but not limited thereto) can be bonded within each display region PA, for example, the light-emitting element 121, the light-emitting element 122, and the light-emitting element 123.

[0074] In this embodiment, the display device 10 further has a plurality of light-transmitting regions TA. These light-transmitting regions TA are, for example, arranged in multiple rows and multiple columns along the direction X and the direction Y, and are spaced apart from each other, where the direction X intersects (e.g., is perpendicular to) the direction Y. That is, these light-transmitting regions TA can be arranged in an array on the substrate 100. It should be particularly noted that a plurality of pixel regions PA are provided in the spaced regions between these light-transmitting regions TA. In this embodiment, the aforementioned spaced regions are defined by the light-shielding structure 170 of the display device 10. The light-shielding structure 170 has a plurality of openings OP2 in each pixel region PA, and these openings OP2 respectively overlap the light-emitting elements 121, 122, and 123 along the direction Z.

[0075] Please refer to Figure 2A , Figure 3A and Figure 3B , in this embodiment, the light-emitting element 120 can be a micro light emitting diode (micro-LED), and includes a first electrode E1, a second electrode E2, and an epitaxial structure layer. The epitaxial structure layer may include a first-type semiconductor layer SCL1, a second-type semiconductor layer SCL2, and a light-emitting layer LEL, where the light-emitting layer LEL is disposed between the first-type semiconductor layer SCL1 and the second-type semiconductor layer SCL2. The first electrode E1 and the second electrode E2 are electrically connected to the first-type semiconductor layer SCL1 and the second-type semiconductor layer SCL2, respectively. The first electrode E1 and the second electrode E2 of the light-emitting element 120 can be respectively bonded to two bonding pads 105 to achieve the electrical connection relationship between the light-emitting element 120 and the substrate 100.

[0076] In this embodiment, the first electrode E1 and the second electrode E2 of the light-emitting element 120 can be disposed on the same side of the epitaxial structure layer facing the substrate 100. More specifically, the light-emitting element 120 can be a flip-chip type micro light emitting diode. In this embodiment, the light-emitting element 120 has a forward light-emitting surface 120es1 facing away from the substrate 100, a lateral light-emitting surface 120es2 connected to the forward light-emitting surface 120es1, and a first edge 120e1, a second edge 120e2, a third edge 120e3, and a fourth edge 120e4 defining the forward light-emitting surface 120es1. The lateral light-emitting surface 120es2 can surround the forward light-emitting surface 120es1. The first edge 120e1 and the third edge 120e3 extend in the direction X. The second edge 120e2 and the fourth edge 120e4 extend in the direction Y. In this embodiment, the length L1 of each of the first edge 120e1 and the third edge 120e3 along the direction X is greater than the length L2 of each of the second edge 120e2 and the fourth edge 120e4 along the direction Y (as Figure 4 shown).

[0077] For example, the display device 10 may further be provided with a pixel definition layer 110 on the substrate surface 100s of the substrate 100. The pixel definition layer 110 has a plurality of openings that define a plurality of pixel regions PA, and these openings expose a plurality of bonding pads 105 on the substrate 100.

[0078] In order to increase the light emission intensity of the light-emitting element 120 on the forward light-emitting surface 120es1, the display device 10 is further provided with a barrier structure 140 on the substrate 100, and the barrier structure 140 covers the lateral light-emitting surface 120es2 of the light-emitting element 120. The barrier structure 140 is adapted to reflect the light emitted by the light-emitting layer LEL of the light-emitting element 120 toward the lateral light-emitting surface 120es2 back to the epitaxial structure layer, so as to increase the chance of the light being emitted from the forward light-emitting surface 120es1. The material of the barrier structure 140 includes, for example, white or highly reflective materials.

[0079] Please refer to Figure 2B 、 Figure 3A and Figure 3B , the barrier structure 140 has an opening OP1 that overlaps the light-emitting element 120 along the direction Z. For example, in the present embodiment, the barrier structure 140 has only one opening OP1 in each pixel region PA. This opening OP1 extends in the direction Y and simultaneously overlaps three light-emitting elements 121-123 in the pixel region PA. However, the present invention is not limited thereto. In an embodiment not shown, the barrier structure may have three openings that respectively overlap three light-emitting elements 120 in each pixel region PA, and these three openings are spaced apart from each other.

[0080] Specifically, the barrier structure 140 includes a first barrier 141 and a second barrier 142. The first barrier 141 is disposed on the pixel definition layer 110, and a passivation layer 115 may further be provided therebetween. The first barrier 141 is disposed around the light-emitting element 120 and covers the lateral light-emitting surface 120es2 of the light-emitting element 120. The second barrier 142 is disposed on the first barrier 141 and does not overlap the plurality of light-emitting elements 120 along the direction Z. More specifically, the second barrier 142 is disposed on opposite sides of the light-emitting element 120 along the direction X (i.e., the first direction), but is not disposed on opposite sides of the light-emitting element 120 along the direction Y (i.e., the second direction).

[0081] In this embodiment, a light-transmissive layer 160 is provided between the first barrier wall 141 and the second barrier wall 142, and the material of the light-transmissive layer 160 includes, for example, a transparent photoresist material, but is not limited thereto. On the other hand, the second barrier wall 142 is provided with an opening OP1 of the barrier wall structure 140, and a scattering layer 165 may be provided in the opening OP1. The scattering layer 165 is, for example, formed by using a transparent photoresist material as a matrix and doping scattering particles. It should be noted first that the provision of the scattering layer 165 can further improve the color shift problem caused by the position shift when the light-emitting element 120 is bonded to the substrate 100 at a large viewing angle. However, the present invention is not limited thereto. In other embodiments, the scattering layer 165 may be replaced by another light-transmissive layer, and the material of the other light-transmissive layer and the light-transmissive layer 160 may be selectively the same.

[0082] From another perspective, in this embodiment, the barrier wall structure 140 has a first portion 140p1 and a second portion 140p2. The first portion 140p1 is disposed along the direction Y opposite to the first edge 120e1 and the third edge 120e3 of the light-emitting element 120. The second portion 140p2 is disposed along the direction X opposite to the second edge 120e2 and the fourth edge 120e4 of the light-emitting element 120. Or rather, the first portion 140p1 of the barrier wall structure 140 is located on the opposite sides of the light-emitting element 120 along the direction Y and does not overlap with the light-emitting element 120 along the direction X. The second portion 140p2 of the barrier wall structure 140 is located on the opposite sides of the light-emitting element 120 along the direction X and does not overlap with the light-emitting element 120 along the direction Y.

[0083] More specifically, the portion of the first barrier wall 141 of the barrier wall structure 140 that overlaps the light-emitting element 120 along the direction Y constitutes the first portion 140p1 of the barrier wall structure 140 (as Figure 3B shown), and the portion of the first barrier wall 141 and the second barrier wall 142 of the barrier wall structure 140 that overlaps the light-emitting element 120 along the direction X constitutes the second portion 140p2 of the barrier wall structure 140 (as Figure 3A shown).

[0084] In this embodiment, the first portion 140p1 and the second portion 140p2 of the barrier wall structure 140 respectively have a first top surface 140ts1 and a second top surface 140ts2 facing away from the substrate 100. The top surfaces of the foregoing portions are, for example, the surfaces of the respective portions of the barrier wall structure 140 that are farthest from the substrate surface 100s. That is to say, the portion of the first barrier wall 141 that constitutes the first portion 140p1 of the barrier wall structure 140 is defined as the first top surface 140ts1 on the side surface facing away from the substrate 100, and the portion of the second barrier wall 142 that constitutes the second portion 140p2 of the barrier wall structure 140 is defined as the second top surface 140ts2 on the side surface facing away from the substrate 100.

[0085] Particularly, in the normal direction of the substrate surface 100s (e.g., direction Z), the first top surface 140ts1 of the barrier structure 140 is lower than the forward light-emitting surface 120es1 of the light-emitting element 120, but higher than the light-emitting layer LEL of the light-emitting element 120. The second top surface 140ts2 of the barrier structure 140 is higher than the forward light-emitting surface 120es1 of the light-emitting element 120. That is to say, the height of the second part 140p2 of the second edge 120e2 and the fourth edge 120e4 of the barrier structure 140 facing the light-emitting element 120 relative to the substrate surface 100s is higher than the forward light-emitting surface 120es1 of the light-emitting element 120 (as Figure 3A shown), while the height of the first part 140p1 of the first edge 120e1 and the third edge 120e3 of the barrier structure 140 facing the light-emitting element 120 and directly covering the lateral light-emitting surface 120es2 relative to the substrate surface 100s is lower than the forward light-emitting surface 120es1 of the light-emitting element 120 (as Figure 3B shown).

[0086] Please refer to Figure 3A 、 Figure 3B and Figure 4 for further details. Moreover, the light-shielding structure 170 is disposed on the barrier structure 140 and includes a first light-shielding layer 171 and a second light-shielding layer 172. The first light-shielding layer 171 is disposed on the first barrier 141 and overlaps the first part 140p1 of the barrier structure 140 along the direction Z. The second light-shielding layer 172 is disposed on the second barrier 142 and overlaps the second part 140p2 of the barrier structure 140 along the direction Z.

[0087] In this embodiment, the first light-shielding layer 171 and the second light-shielding layer 172 respectively have a height H1 and a height H2 relative to the substrate surface 100s, and the height H2 is greater than the height H1. That is, the height H1 of the first light-shielding layer 171 disposed on the first part 140p1 of the barrier structure 140 is lower than the height H2 of the second light-shielding layer 172 disposed on the second part 140p2 of the barrier structure 140. Or rather, the height H1 of the part of the light-shielding structure 170 facing the first edge 120e1 and the third edge 120e3 of the light-emitting element 120 along the direction Y is lower than the height H2 of the other part of the light-shielding structure 170 facing the second edge 120e2 and the fourth edge 120e4 of the light-emitting element 120 along the direction X.

[0088] Since the display device is prone to color shift problems due to the position offset when the light-emitting element 120 is bonded to the substrate 100 at a large viewing angle, and in this embodiment, the length L1 of the light-emitting element 120 along the direction X is greater than its length L2 along the direction Y, the large viewing angle color shift amount generated by the position offset of the light-emitting element 120 in the direction Y will be greater than the large viewing angle color shift amount generated by the position offset of the light-emitting element 120 in the direction X.

[0089] Therefore, making the second top surface 140ts2 of the second part 140p2 of the barrier structure 140 higher than the forward light-emitting surface 120es1 of the light-emitting element 120, and making the first top surface 140ts1 of the first part 140p1 of the barrier structure 140 lower than the forward light-emitting surface 120es1 of the light-emitting element 120 can not only significantly improve the light extraction efficiency of the light-emitting element 120, but also suppress the color shift phenomenon caused by the position offset when the light-emitting element 120 is bonded to the substrate 100 at a large viewing angle of the display device 10. That is, it can balance the light extraction efficiency and color performance of the display device 10.

[0090] In this embodiment, the first light-shielding layer 171 has light-shielding edges 171e1 and 171e2 that define the opening OP2 and extend in the direction X, and the second light-shielding layer 172 has light-shielding edges 172e1 and 172e2 that define the opening OP2 and extend in the direction Y. It should be particularly noted that the distance d1 between the light-shielding edge 171e1 and the first edge 120e1 along the direction Y and the distance d3 between the light-shielding edge 171e2 and the third edge 120e3 along the direction Y are greater than the distance d2 between the light-shielding edge 172e1 and the second edge 120e2 along the direction X and the distance d4 between the light-shielding edge 172e2 and the fourth edge 120e4 along the direction X. From another perspective, the difference between the length L4 of the opening OP2 of the light-shielding structure 170 along the direction Y and the length L2 of the light-emitting element 120 along the direction Y will be greater than the difference between the length L3 of the opening OP2 of the light-shielding structure 170 along the direction X and the length L1 of the light-emitting element 120 along the direction X. Accordingly, the large viewing angle color shift generated by the position offset when the light-emitting element 120 is bonded to the substrate 100 of the display device 10 can be further reduced.

[0091] In this embodiment, the display device 10 may further include a packaging layer 180 that covers the light-shielding structure 170 and the scattering layer 165. The material of the packaging layer 180 includes, for example, polydimethylsiloxane (PDMS).

[0092] The manufacturing method of the display device 10 will be exemplarily described below.

[0093] Please refer to Figure 5A and Figure 5B, First, a bonding process of a plurality of light-emitting elements 120 and a substrate 100 is performed. After completing the bonding of these light-emitting elements 120 and the substrate 100, a first barrier material layer 141M is formed on the substrate 100. The first barrier material layer 141M covers the forward light-emitting surface 120es1 and the lateral light-emitting surface 120es2 of the light-emitting element 120, the bonding pad 105, and the pixel defining layer 110.

[0094] Next, an exposure and development process is performed on the first barrier material layer 141M to form a first barrier 141 of the barrier structure 140, as Figure 5B and Figure 6B shown. It should be specifically noted that the exposure process of the first barrier material layer 141M is, for example, a weak exposure method. Therefore, after the development process, the portion of the first barrier material layer 141M above the forward light-emitting surface 120es1 of the light-emitting element 120 will be removed, leaving only the portion covering the lateral light-emitting surface 120es2.

[0095] Please refer to Figure 5C and Figure 6C , after the first barrier 141 is completed, a light-transmitting material layer 160M is formed to cover the first barrier 141 and the forward light-emitting surface 120es1 of the light-emitting element 120. An exposure and development process is performed on the light-transmitting material layer 160M to form a light-transmitting layer 160, as Figure 5D and Figure 6D shown. Next, a first light-shielding material layer 171M is formed on the light-transmitting layer 160 to cover the light-transmitting layer 160 and the first barrier 141, as Figure 5E and Figure 6E shown.

[0096] An exposure and development process is performed on the first light-shielding material layer 171M to form a first light-shielding layer 171, as Figure 5F and Figure 6F shown. After the development process, the first light-shielding layer 171 has an opening OP2a, and the light-transmitting layer 160 is located within the opening OP2a. Please refer to Figure 5G and Figure 6G , a second barrier material layer 142M is formed on the first light-shielding layer 171. An exposure and development process is performed on the second barrier material layer 142M to form a second barrier 142 of the barrier structure 140, as Figure 5H and Figure 6H shown, wherein the second barrier 142 has an opening OP1 that overlaps the forward light-emitting surface 120es1 of the light-emitting element 120 along the direction Z.

[0097] Please refer to Figure 5I and Figure 6I, after the second retaining wall 142 is completed, a scattering layer 165 is formed to fill the opening OP1 of the second retaining wall 142. Then, a second light-shielding material layer 172M is formed on the scattering layer 165, and the second light-shielding material layer 172M is subjected to an exposure and development process to form a second light-shielding layer 172, as Figure 5J and Figure 6J shown. After the development process, the second light-shielding layer 172 has an opening OP2b.

[0098] Specifically, in the normal direction (e.g., direction Z) of the substrate surface 100s, the overlapping portion of the opening OP2a of the first light-shielding layer 171 and the opening OP2b of the second light-shielding layer 172 can define Figure 2A the opening OP2 of the middle light-shielding structure 170. Then, an encapsulation layer 180 is formed on the second light-shielding layer 172 to cover the scattering layer 165 and the second light-shielding layer 172, as Figure 3A and Figure 3B shown. Thus, the fabrication of the display device 10 of this embodiment is completed.

[0099] Some other embodiments will be listed below to illustrate the present invention in detail. The same components will be labeled with the same symbols, and the description of the same technical content will be omitted. For the omitted part, please refer to the foregoing embodiments and will not be repeated hereinafter.

[0100] Figure 7 is a cross-sectional schematic view of a display device according to a second embodiment of the present invention. Please refer to Figure 7 , compared with Figure 3A the display device 10, the display device 10A of this embodiment further includes a color conversion layer 168. For example, in this embodiment, the color conversion layer 168 can be disposed in the opening OP1 of the retaining wall structure 140 and located between the scattering layer 165 and the light-transmitting layer 160, but not limited thereto. In a variant embodiment, the scattering layer 165 can be located between the color conversion layer 168 and the light-transmitting layer 160. By providing the color conversion layer 168, the selection flexibility of the light-emitting element 120 can be increased, and the color performance of the display device 10A can be improved.

[0101] Figure 8 is a cross-sectional schematic view of a display device according to a third embodiment of the present invention. Please refer to Figure 8 , compared with Figure 3A the display device 10, the display device 10B of this embodiment further includes a filter layer 190. In this embodiment, the filter layer 190 can be disposed in the opening OP2 of the light-shielding structure 170. By providing the filter layer 190, the color performance of the display device 10B can be further improved.

[0102] Figure 9 is a cross-sectional schematic view of a display device according to a fourth embodiment of the present invention. Please refer toFigure 9 , compared with Figure 3A of the display device 10, the display device 10C of this embodiment further includes a color conversion layer 168 and a light filtering layer 190. In this embodiment, the light filtering layer 190 can be disposed within the opening OP2 of the light shielding structure 170, and the color conversion layer 168 can be disposed within the opening OP1 of the barrier structure 140 and is located between the scattering layer 165 and the light transmissive layer 160, but is not limited thereto. Through the arrangement of the light filtering layer 190 and the color conversion layer 168, the color performance of the display device 10C can be further improved. In addition, the arrangement of the color conversion layer 168 can also increase the selection flexibility of the light emitting elements 120.

[0103] Figure 10 is a cross-sectional schematic view of a display device according to a fifth embodiment of the present invention. Figure 11 is a cross-sectional schematic view of a display device according to a sixth embodiment of the present invention. Figure 12 is a cross-sectional schematic view of a display device according to a seventh embodiment of the present invention.

[0104] Please refer to Figure 10 , compared with Figure 3A of the display device 10, the display device 10D of this embodiment further includes a lens structure 195. The lens structure 195 can be disposed within the opening OP2 of the light shielding structure 170 and is covered by the encapsulation layer 180. For example, in this embodiment, the lens structure 195 can be a Fresnel lens having characteristics such as collimation, light collection, and high gain of front view luminance.

[0105] However, the present invention is not limited thereto. In Figure 11 of the display device 10E, the lens structure 195A can be a lens array. For example, the lens array includes a plurality of microlenses, and these microlenses can be arranged in multiple columns and multiple rows along the direction X and the direction Y, but is not limited thereto. In Figure 11 of another variant embodiment, the lens structure can include a plurality of microcylindrical lenses, and these microcylindrical lenses are arranged along the direction X and extend in the direction Y. In Figure 12 of the display device 10F, the lens structure 195B can be a single lens having a flat top.

[0106] It should be noted that Figures 10 to 12 the lens structure in is only for illustrative purposes, and the present invention is not limited by the content disclosed in the drawings. In other embodiments, the configuration and distribution of the lens structure can be adjusted according to the actual light output requirements of the display device.

[0107] In summary, in the display device according to an embodiment of the present invention, the light-emitting element disposed on the surface of the substrate has a first edge and a second edge that define a light-emitting surface and whose extending directions intersect each other, and the length of the first edge is greater than the length of the second edge. The barrier structure disposed around the light-emitting element has a first portion and a second portion disposed opposite to the first edge and the second edge of the light-emitting element, respectively. Since the second top surface of the second portion of the barrier structure is higher than the light-emitting surface of the light-emitting element, the light extraction efficiency of the light-emitting element can be effectively improved. On the other hand, by making the first top surface of the first portion of the barrier structure lower than the light-emitting surface of the light-emitting element, the large viewing angle color shift caused by the position shift when the light-emitting element is bonded to the substrate can be significantly improved.

Claims

1. A display device, characterized in that: include: a substrate; a light emitting element bonded to the substrate, the light emitting element having a front light emitting surface facing away from the substrate and a first edge and a second edge defining the front light emitting surface, the first edge and the second edge extending in a first direction and a second direction respectively, the length of the first edge along the first direction being greater than the length of the second edge along the second direction, the first direction and the second direction being parallel to a substrate surface of the substrate and intersecting each other; as well as A retaining wall structure is arranged on the substrate and around the light-emitting element, the retaining wall structure has a first portion and a second portion, the first portion is arranged along the second direction opposite to the first edge of the light-emitting element, and the second portion is arranged along the first direction opposite to the second edge of the light-emitting element, wherein the first portion and the second portion of the retaining wall structure respectively have a first top surface and a second top surface facing away from the substrate, and in the normal direction of the substrate surface, the first top surface is lower than the forward light-emitting surface of the light-emitting element, and the second top surface is higher than the forward light-emitting surface of the light-emitting element.

2. The display device according to claim 1, wherein: Also includes: A light shielding structure is arranged on the retaining wall structure, wherein the retaining wall structure also has a first opening overlapping the light emitting element, and the light shielding structure has a second opening overlapping the first opening.

3. The display device according to claim 2, wherein: The shading structure comprises: a first light shielding layer, disposed on the first portion of the retaining wall structure and overlapping the first portion; and A second light shielding layer is disposed on the second portion of the retaining wall structure and overlaps the second portion, wherein the first light shielding layer and the second light shielding layer respectively have a first height and a second height relative to the substrate surface, and the second height is greater than the first height.

4. The display device according to claim 2, wherein: The shading structure also has a first shading edge and a second shading edge that define the second opening, the first shading edge and the second shading edge extend in the first direction and the second direction respectively, and the distance between the first shading edge and the first edge along the second direction is greater than the distance between the second shading edge and the second edge along the first direction.

5. The display device according to claim 2, wherein: The light-emitting element has a first length and a second length along the first direction and the second direction respectively, the second opening of the shading structure has a third length and a fourth length along the first direction and the second direction respectively, the first length is greater than the second length, the third length is greater than the first length, the fourth length is greater than the second length, and the difference between the fourth length and the second length is greater than the difference between the third length and the first length.

6. The display device according to claim 1, wherein: The retaining wall structure includes: a first retaining wall, disposed around the light emitting element and covering a side light emitting surface of the light emitting element; and A second retaining wall is arranged on the first retaining wall and is located on two opposite sides of the light-emitting element along the first direction, wherein the first retaining wall is provided with the first top surface, the second retaining wall is provided with the second top surface, and in the normal direction of the substrate surface, the second retaining wall does not overlap with the first top surface and the positive light-emitting surface.

7. The display device according to claim 6, wherein: Also includes: A light-transmitting layer is disposed between the first retaining wall and the second retaining wall.

8. The display device according to claim 1, wherein: The light-emitting element includes a first-type semiconductor layer, a light-emitting layer and a second-type semiconductor layer stacked in sequence on the surface of the substrate. The second-type semiconductor layer is provided with a positive light-emitting surface on the side facing away from the substrate, and in the normal direction of the substrate surface, the first top surface of the first part of the retaining wall structure is higher than the light-emitting layer.

9. The display device according to claim 1, wherein: The retaining wall structure further has a first opening overlapping the light emitting element. The first opening overlaps the forward light emitting surface of the light emitting element. A scattering layer is disposed in the first opening.

10. The display device according to claim 9, characterized in that A color conversion layer is also arranged in the first opening.

11. The display device according to claim 9, characterized in that Also includes: A light shielding structure is arranged on the retaining wall structure and has a second opening overlapping the first opening, wherein a filter layer is arranged in the second opening.

12. The display device according to claim 9, wherein: Also includes: A light shielding structure is arranged on the retaining wall structure and has a second opening overlapping the first opening, wherein a lens structure is arranged in the second opening.

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