Display device

Abstract

A display device includes: a driving circuit arrangement disposed on a substrate; a first conductive layer disposed on the driving circuit; a plurality of light-emitting units, at least one of which is disposed on the first conductive layer and electrically connected to the driving circuit; and a second conductive layer disposed on the at least one light-emitting unit. The second conductive layer has a first surface and a second surface, wherein the first surface corresponds to the at least one light-emitting unit and the second surface corresponds to a region located outside the first conductive layer. The roughness of the first surface is greater than the roughness of at least a portion of the second surface.

Description

[0001] This application is a divisional application of the invention patent application filed on May 24, 2018, with application number 201810510202.9 and invention name “Display Device”. Technical Field

[0002] Embodiments of the present invention relate to a display technology, and more particularly to a display device using micro light-emitting devices (LEDs). Background Art

[0003] Display devices (e.g., liquid-crystal displays (LCDs) or active organic light-emitting displays (AMOLEDs)) are widely used in electronic products such as notebook computers, personal digital assistants (PDAs), e-books, projectors, and mobile phones.

[0004] Display panels with display devices typically utilize one or more light source components within the pixel region. Recently, LEDs (light emitting diodes) are increasingly being considered as light source components for display devices. LEDs convert electrical energy into light energy and typically have a quantum well structure as a light-emitting layer sandwiched between two opposing doped semiconductor layers. As semiconductor materials used in LEDs have improved, many new LEDs are capable of more efficiently converting electrical energy into light energy.

[0005] LED display panels use an array of light-emitting diodes integrated with a thin-film transistor (TFT) array substrate to form the display's pixels (or sub-pixels). Due to the self-luminous nature of LEDs, a backlight module can be eliminated. This allows LED display panels to be thinner and lighter, giving them a competitive advantage.

[0006] Compared to organic LED (OLED) displays, LED displays are more stable and have longer lifespans, higher brightness, and shorter response times. Therefore, LED displays are gradually becoming the mainstream of next-generation display products.

[0007] Although current display devices utilize LEDs as light source components, they are not able to fully meet all aspects. Therefore, there are still some problems to be overcome in the manufacture of display devices. Summary of the Invention

[0008] According to some embodiments, the present invention provides a display device, comprising: a substrate; a driving circuit disposed on the substrate; a first conductive layer disposed on the driving circuit; a plurality of light-emitting units, at least one of the light-emitting units being disposed on the first conductive layer and electrically connected to the driving circuit; and a second conductive layer disposed on the at least one light-emitting unit; wherein the second conductive layer has a first surface and a second surface, and the first surface corresponds to the at least one light-emitting unit and the second surface corresponds to an area outside the first conductive layer; and wherein the roughness of the first surface is greater than the roughness of at least a portion of the second surface.

[0009] According to some embodiments, the present invention provides a display device comprising: a substrate; a driving circuit disposed on the substrate; a first conductive layer disposed on the driving circuit; and a plurality of light-emitting units, at least one of the light-emitting units being disposed on the first conductive layer and electrically connected to the driving circuit, wherein each of the light-emitting units comprises a first semiconductor layer disposed on the first conductive layer and a second semiconductor layer disposed on the first semiconductor; wherein the first semiconductor layer has a first surface adjacent to the first conductive layer, and the second semiconductor layer has a second surface, which is the surface farthest from the first conductive layer; and wherein the roughness of the second surface is greater than the roughness of the first surface.

[0010] According to some embodiments, the present invention provides a display device comprising: a substrate; a driving circuit disposed on the substrate; a first conductive layer disposed on the driving circuit; and a plurality of light-emitting units, at least one of the light-emitting units being disposed on the first conductive layer and electrically connected to the driving circuit, wherein each of the light-emitting units comprises a first electrode disposed on the first conductive layer, a first semiconductor layer disposed on the first electrode, a second semiconductor layer disposed on the first semiconductor layer, and a second electrode disposed on the second semiconductor layer; wherein the first electrode has a first surface adjacent to the first conductive layer, and the second electrode has a second surface, which is the surface farthest from the first conductive layer; and wherein the roughness of the second surface is greater than the roughness of the first surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings, in which:

[0012] Figure 1 FIG2 is a schematic plan view of a display panel having display devices arranged in an array according to some embodiments of the present invention.

[0013] Figure 2-1 Is drawn along Figure 1 Schematic diagram of the cross section along the 2-2' line.

[0014] Figure 2-2 FIG2 is a schematic cross-sectional view of a display device according to some embodiments of the present invention.

[0015] Figure 3 FIG2 is a schematic cross-sectional view of a display device according to some embodiments of the present invention.

[0016] Figure 4-1 FIG2 is a schematic cross-sectional view of a display device according to some embodiments of the present invention.

[0017] Figure 4-2 FIG2 is a schematic cross-sectional view of a display device according to some embodiments of the present invention.

[0018] Figure 4-3 FIG2 is a schematic cross-sectional view of a display device according to some embodiments of the present invention.

[0019] Figure 4-4 FIG2 is a schematic cross-sectional view of a display device according to some embodiments of the present invention.

[0020] Figure 5-1 FIG2 is a schematic cross-sectional view of a display device according to some embodiments of the present invention.

[0021] Figure 5-2 FIG2 is a schematic cross-sectional view of a display device according to some embodiments of the present invention.

[0022] Figure 6-1 FIG2 is a schematic cross-sectional view of a display device according to some embodiments of the present invention.

[0023] Figure 6-2 FIG2 is a schematic cross-sectional view of a display device according to some embodiments of the present invention.

[0024] Description of component numbers in the figure:

[0025] 10, 10a, 20, 30, 30a, 30b, 30c, 40, 40a, 50, 50a display device

[0026] 100 substrates

[0027] 110 drive circuit

[0028] 112 active layer

[0029] 113 gate dielectric layer

[0030] 114 gate electrode

[0031] 116 source electrode

[0032] 118 drain electrode

[0033] 122 Common Line

[0034] 123 First insulation layer

[0035] 124 first conductive layer

[0036] 124a upper surface

[0037] 124b lower surface

[0038] 125 Second insulation layer

[0039] 125a, 151a conductive structure

[0040] 127 Notch

[0041] 129 bonding layer

[0042] 130 light-emitting units

[0043] 132 first electrode

[0044] Surfaces 132a, 134a, 138a, 140a, 152c

[0045] 134 first semiconductor layer

[0046] 136 Quantum Well Structure

[0047] 138 second semiconductor layer

[0048] 140 second electrode

[0049] 151 Third insulation layer

[0050] 152 second conductive layer

[0051] 152a, 152a' first surface

[0052] 152b Second surface

[0053] 155, 165 scattering layer

[0054] 155a, 165a Rough surface

[0055] 167 Scattering Particles

[0056] 214 gate lines

[0057] 216 data cable DETAILED DESCRIPTION

[0058] The following describes how to make and use an embodiment of the present invention. However, it will be readily apparent that the present invention provides many suitable inventive concepts that can be implemented in a wide variety of specific contexts. The specific embodiments disclosed are merely illustrative of how to make and use the present invention and are not intended to limit the scope of the invention. Furthermore, throughout the drawings and description of the embodiments of the present invention, the same reference numerals are used to represent the same or similar components.

[0059] Please refer to Figure 1 and Figure 2-1 ,in Figure 1 FIG. 1 is a schematic plan view of a display panel of a display device 10 arranged in an array according to some embodiments of the present invention. Figure 2-1 Is drawn along Figure 1 Schematic cross-sectional view taken along line 2-2'. In some embodiments, the display device 10 may be a micro-LED display device. In some embodiments, the display device 10 includes a substrate 100, which may be made of glass, quartz, plastic, fiber, rubber, or other transparent materials. In some embodiments, the substrate 100 may be made of metal foil or other non-transparent materials.

[0060] like Figure 2-1 As shown, in some embodiments, the display device 10 further includes a driving circuit 110 disposed on the substrate 100. In some embodiments, the driving circuit 110 includes a transistor (e.g., a thin film transistor) disposed on the substrate 100. For example, the transistor can be used as a driving element for the display area or the peripheral area.

[0061] In the above-mentioned embodiments, the driving circuit 110 includes an active layer 112, a gate dielectric layer 113, a gate electrode 114, a source electrode 116, and a drain electrode 118. The active layer 112 is disposed on the substrate 100 and includes a channel region and source and drain regions located on either side of the channel region. The active layer 112 can be made of amorphous silicon, polycrystalline silicon (e.g., low-temperature polysilicon (LTPS)), metal oxide semiconductor (e.g., indium gallium zinc oxide (IGZO), indium zinc oxide (IZO), indium gallium oxide (IGO), indium tin zinc oxide (ITZO), or the like).

[0062] The gate dielectric layer 113 covers the active layer 112 and the substrate 100 and has an opening to expose the source region and the drain region of the active layer 112. The gate dielectric layer 113 may include an inorganic material, such as silicon oxide, silicon nitride, or a combination thereof.

[0063] The gate electrode 114 is disposed on the gate dielectric layer 113 and is connected to the gate line 214 (shown in FIG. Figure 1 The gate electrode 114 may include a conductive material, examples of which may include but are not limited to copper, aluminum, gold, silver, molybdenum, tungsten, chromium, alloys thereof, and other suitable electrode materials.

[0064] The source electrode 116 is connected to the data line 216 (shown in FIG. Figure 1 ) extends. Furthermore, the source electrode 116 and the drain electrode 118 are disposed on the gate electrode 114 and are electrically connected to the source region and the drain region of the active layer 112, respectively, through the opening of the gate dielectric layer 113. The source electrode 116 and the drain electrode 118 may include a conductive material, examples of which may include but are not limited to: copper, aluminum, gold, silver, molybdenum, tungsten, titanium, chromium, alloys thereof, and other suitable electrode materials. The source electrode 116 and the drain electrode 118 may be a single layer or have a multi-layer structure. For example, the source electrode 116 and the drain electrode 118 are a multi-layer structure of molybdenum / aluminum / molybdenum (Mo / Al / Mo).

[0065] In some embodiments, the display device 10 further includes a first insulating layer 123 disposed on the gate dielectric layer 113 and covering the gate electrode 114, thereby electrically isolating the source electrode 116 and the drain electrode 118 from the gate electrode 114. The first insulating layer 123 can be made of the same or similar material as the gate dielectric layer 113. The source electrode 116 and the drain electrode 118 are disposed on the first insulating layer 123 and pass through the first insulating layer 123 to be electrically connected to the source region and the drain region of the active layer 112, respectively.

[0066] In some embodiments, the display device 10 further includes a second insulating layer 125 having a recess 127 located above the driving circuit 10 and disposed on the first insulating layer 123. The second insulating layer 125 serves as a planarization layer and covers the source electrode 116 and the drain electrode 118. Furthermore, the second insulating layer 125 may include an organic or inorganic insulating material, examples of which include, but are not limited to, inorganic materials (such as silicon oxide, silicon nitride, silicon oxynitride, and metal oxides) or organic materials (such as polyimide, acrylate, epoxy, poly(methyl methacrylate), benzocyclobutene, and polyester).

[0067] In some embodiments, the display device 10 further includes a first conductive layer 124 conformally disposed within the recess 127. In some embodiments, the first conductive layer 124 can serve as a reflective layer and can be made of a metal, examples of which include, but are not limited to, aluminum, titanium, silver, gold, molybdenum, copper, or an alloy. The first conductive layer 124 has an upper surface 124a and a lower surface 124b, with the upper surface 124a facing the lower surface 124b. The lower surface 124b of the first conductive layer 124 is electrically connected to the drain electrode 118 of the driving circuit 110 via a conductive structure 125a (e.g., a conductive plug) within the second insulating layer 125.

[0068] In some embodiments, the display device 10 further includes a common line 122 disposed on the second insulating layer 125. The common line 122 can be made of the same or similar material as the first conductive layer 124.

[0069] In some embodiments, the display device 10 further includes one or more light emitting units 130 (eg, micro LEDs) disposed on the first conductive layer 124 within the recess 127 of the second insulating layer 125. In one example, the display device 10 includes two light emitting units 130, such as Figure 2-1 However, it is understood that the number of light emitting units 130 depends on the design requirements and is not limited to Figure 2-1 Example of .

[0070] At least one light-emitting unit 130 is adjacent to the upper surface 124a of the first conductive layer 124. For example, each light-emitting unit 130 can be mounted on the upper surface 124a of the first conductive layer 124 via a bonding layer 129, electrically connecting the light-emitting unit 130 to the driving circuit 110 via the first conductive layer 124 and the conductive structure 125a. The bonding layer 129 is used to facilitate bonding of the light-emitting unit 130 via a bonding mechanism (e.g., eutectic alloy bonding) and can be composed of an alloy, examples of which include, but are not limited to, indium, tin, gold, silver, molybdenum, or aluminum.

[0071] In some embodiments, the light-emitting unit 130 includes: a first electrode 132 disposed on the first conductive layer 124 through the bonding layer 129; a first semiconductor layer 134 disposed on the first electrode 132; a quantum well structure 136 disposed on the first semiconductor layer 134; a second semiconductor layer 138 disposed on the quantum well structure 136; and a second electrode 140 disposed on the second semiconductor layer 138. In some embodiments, the first electrode 132 and the second electrode 140 serve as the anode and cathode of the light-emitting unit 130, respectively. In these cases, the first semiconductor layer 134 and the second semiconductor layer 138 are p-type doped layers and n-type doped layers, respectively. Alternatively, when the first electrode 132 and the second electrode 140 serve as the cathode and anode of the light-emitting unit 130, respectively, the first semiconductor layer 134 and the second semiconductor layer 138 may also be n-type doped layers and p-type doped layers, respectively.

[0072] In some embodiments, the display device 10 further includes a third insulating layer 151 disposed on the second insulating layer 125 and filling the recess 127 of the second insulating layer 125. The third insulating layer 151 located within the recess 127 of the second insulating layer 125 surrounds the light-emitting unit 130. Furthermore, the first conductive layer 124 surrounds the third insulating layer 151 located within the recess 127 of the second insulating layer 125. Although the third insulating layer 151 surrounds the light-emitting unit 130, the second electrode 140 of the light-emitting unit 130 is exposed on the top surface of the third insulating layer 151. The third insulating layer 151 may be composed of an organic insulating material, examples of which include, but are not limited to, polyimide, acrylate, epoxy, poly(methylmethacrylate), benzocyclobutene, and polyester.

[0073] In some embodiments, the display device 10 further includes a second conductive layer 152 disposed on the third insulating layer 151 and at least one light-emitting unit 130. Furthermore, the second conductive layer 152 is electrically connected to the common line 122 via a conductive structure 151a (e.g., a conductive plug) within the third insulating layer 151, thereby electrically connecting the exposed second electrode 140 of the light-emitting unit 130 to the common line 122 via the second conductive layer 152 and the conductive structure 151a. The second conductive layer 152 may be made of a transparent conductive material, examples of which include, but are not limited to, indium zinc oxide, indium tin oxide, indium gallium zinc oxide, poly(3,4-ethylenedioxythiophene), poly(p-phenylenevinylene), polypyrrole, polythiophene, polyaniline, polyphenylene sulfide, or polyacetylene.

[0074] In some embodiments, the second conductive layer 152 has a first surface 152a corresponding to at least one light-emitting unit 130. For example, the second conductive layer 152 has a first surface 152a corresponding to each light-emitting unit 130. Furthermore, viewed from above, the second conductive layer 152 has a second surface 152b corresponding to an area outside the first conductive layer 124. In some embodiments, the roughness of the first surface 152a is greater than the roughness of at least a portion of the second surface 152b. In some embodiments, the first surface 152a is a rough surface, and the second surface 152b is a substantially flat surface, so that from a top view, the area of ​​the second conductive layer 152 located outside the first conductive layer 124 has a uniform thickness. In these cases, the roughness of the first surface 152a may be greater than or equal to 3 nm and less than or equal to 100 nm. In the present invention, the value of "roughness" is determined by the ten point height of irregularities (R z ), which is defined as the average value between the five highest peaks and the five deepest valleys within a measurement length.

[0075] Please refer to Figure 2-2 , which depicts a cross-sectional view of a display device 10a according to some embodiments of the present invention, wherein the same Figure 2-1 The components are denoted by the same reference numerals and their descriptions are omitted. In this embodiment, the structure of the display device 10a is similar to that of Figure 2-1 The structure of the display device 10 in FIG. 1 has the same advantages as the display device 10. Figure 2-1In the structure of the display device 10, when viewed from above, the second conductive layer 152 of the display device 10a has a first surface 152a' corresponding to the first conductive layer 124 in the recess 127 of the second insulating layer 125. Figure 2-1 The first surface 152a and the first surface 152a' are rough surfaces. In some embodiments, the roughness of the first surface 152a' is greater than or equal to 3 nm and less than or equal to 100 nm.

[0076] Please refer to Figure 3 , which depicts a cross-sectional view of a display device 20 according to some embodiments of the present invention, wherein the same Figure 2-1 The components are denoted by the same reference numerals and their descriptions are omitted. In this embodiment, the structure of the display device 20 is similar to that of Figure 2-1 The structure of the display device 10 in FIG. 1 has the same advantages as the display device 10. Figure 2-1 In the structure of the display device 10, the upper surface 124a of the first conductive layer 124 is a rough surface, and the roughness of the upper surface 124a is greater than the roughness of at least a portion of the second surface 152b of the second conductive layer 152. In some embodiments, the portion of the upper surface 124a corresponding to the sidewall of the recess 127 of the second insulating layer 125 is substantially flat.

[0077] In some embodiments, similar to Figure 2-2 As shown in the first surface 152 a ′, the first surface 152 a of the second conductive layer 152 in the display device 20 may correspond to the first conductive layer 124 in the recess 127 of the second insulating layer 125 when viewed from above.

[0078] Since the light-emitting unit 130 in the display device 20 is disposed between two opposite and rough surfaces, the viewing angle performance of the display device 20 can be further improved.

[0079] Please refer to Figure 4-1 and Figure 4-2 , which respectively illustrate cross-sectional schematic diagrams of display devices 30 and 30a according to some embodiments of the present invention, wherein the same Figure 2-1 The components are denoted by the same reference numerals and their descriptions are omitted. In this embodiment, the structures of the display devices 30 and 30a are similar to those of Figure 2-1 The structure of the display device 10 in FIG. 1 has the same advantages as the display device 10. Figure 2-1In the structure of the display device 10, the display devices 30 and 30a further include a scattering layer 155 disposed on the second conductive layer 152 above the light-emitting element 130. In some embodiments, the scattering layer 155 has a rough surface 155a relative to the first surface 152a and the second surface 152b of the second conductive layer 152. In some embodiments, the rough surface 155a can be obtained by patterning (using a photolithography and etching process, an ion bombardment process, or other suitable patterning process). In some embodiments, the scattering layer 155 partially covers the second conductive layer 152, such as Figure 4-1 For example, when viewed from above, the scattering layer 155 may correspond to the first conductive layer 124 within the recess 127 of the second insulating layer 125. In addition, when viewed from above, the scattering layer 155 may be extended to at least cover the common line 122, as shown in FIG. Figure 4-2 30a. In this case, the scattering layer 155 may be extended to cover the entire second insulating layer 152. In some embodiments, the scattering layer 155 may be made of an inorganic material (such as silicon oxide, silicon nitride, silicon oxynitride, or metal oxide) or an organic material (such as polyimide, acrylate, epoxy, poly(methylmethacrylate), benzocyclobutene, or polyester).

[0080] In some embodiments, the scattering layer 155 includes scattering particles (not shown) disposed therein. For example, these scattering particles may be transparent particles or quantum dot transparent particles. In some embodiments, the transparent particles may be composed of silicon oxide, silicon nitride, or a metal oxide. In some embodiments, the quantum dots have a core-shell structure. For example, the quantum dots may include a core composed of CdSe, dTe, CdS, ZnS, ZnSe, ZnO, ZnTe, InAs, InP, or GaP, and a shell composed of ZnS, ZnSe, GaN, or GaP.

[0081] In some embodiments, as Figure 4-1 and Figure 4-2 The first conductive layer 124 of the display devices 30 and 30a shown may have an upper surface that is the same as or similar to Figure 3 The upper surface of the first conductive layer 124 is formed.

[0082] Please refer to Figure 4-3 , which respectively illustrate cross-sectional schematic diagrams of display devices 30b according to some embodiments of the present invention, wherein the same Figure 2-1The components are denoted by the same reference numerals and their descriptions are omitted. In this embodiment, the structure of the display device 30b is similar to that of Figure 2-1 The structure of the display device 10 in FIG. 1 has the same advantages as the display device 10. Figure 2-1 In the structure of the display device 10, the display device 30b further includes a scattering layer 165 disposed on the first conductive layer 124 and below the light-emitting unit 130. In some embodiments, the scattering layer 165 has a rough surface 165a relative to the upper surface 124a of the first conductive layer 124. In some embodiments, the rough surface 165a can be obtained by patterning (using a photolithography and etching process, an ion bombardment process, or other suitable patterning). In some embodiments, the first conductive layer 124 located on the sidewall of the recess 127 of the second insulating layer 125 is exposed to the scattering layer 165. In some embodiments, the scattering layer 165 is made of the same or similar Figure 4-1 or Figure 4-2 The material composition of the scattering layer 155 shown in the figure.

[0083] Please refer to Figure 4-4 , which respectively illustrate cross-sectional schematic diagrams of display devices 30c according to some embodiments of the present invention, wherein the same Figure 4-3 The components are denoted by the same reference numerals and their descriptions are omitted. In this embodiment, the structure of the display device 30c is similar to that of Figure 4-3 The structure of the display device 30b in FIG has the same advantages as the display device 30b. Figure 4-3 In the structure of display device 30b, a scattering layer 165 disposed on the first conductive layer 124 surrounds at least a portion of each light-emitting unit 130. For example, the recess 127 containing the first conductive layer 124 and the light-emitting unit 130 can be completely filled with the scattering layer 165, leaving the portion of each light-emitting unit 130 protruding from the recess 127 exposed to the scattering layer 165. In some embodiments, the scattering layer 165 includes scattering particles 167 therein to enhance the scattering capability of the scattering layer 165, thereby improving the viewing angle efficiency of display device 30c. For example, the scattering particles 167 can be transparent particles or quantum dot transparent particles. In some embodiments, the transparent particles can be composed of silicon oxide, silicon nitride, or metal oxide. In some embodiments, the quantum dots have a core-shell structure. For example, the quantum dots can include a core composed of CdSe, dTe, CdS, ZnS, ZnSe, ZnO, ZnTe, InAs, InP, or GaP, and a shell composed of ZnS, ZnSe, GaN, or GaP.

[0084] Please refer to Figure 5-1 , which respectively illustrate cross-sectional schematic diagrams of display devices 40 according to some embodiments of the present invention, wherein the same Figure 2-1The components are denoted by the same reference numerals and their descriptions are omitted. In this embodiment, the structure of the display device 40 is similar to that of Figure 2-1 The structure of the display device 10 in FIG. 1 has the same advantages as the display device 10. Figure 2-1 In the structure of the display device 10, the first electrode 132 of the light-emitting unit 130 has a surface 132a adjacent to the first conductive layer 124 and facing the upper surface 124a of the first conductive layer 124. Furthermore, the second electrode 140 of the light-emitting unit 130 has a surface 140a adjacent to the second conductive layer 152, opposite to the first surface 152a of the second conductive layer 152, and the surface farthest from the first conductive layer 124. The roughness of surface 140a is greater than the roughness of surface 132a. As a result, the first surface 152a of the second conductive layer 152 and the underlying surface 140a of the second electrode 140 can increase the viewing angle of light from the light-emitting unit 130, thereby improving the viewing angle efficiency of the display device 40.

[0085] In some embodiments, the first conductive layer 124 of the display device 40 has an upper surface 124a that is the same as or similar to Figure 3 upper surface 124a.

[0086] In some embodiments, similar to Figure 4-1 、 4-2 , 4-3 and 4-4 respectively show the display devices 30, 30a, 30b and 30c, the display device 40 may further include a scattering layer 155 (such as Figure 4-1 and 4-2 ), or a scattering layer 165 (as shown) disposed on the first conductive layer 124 and below the light emitting unit 130 Figure 4-3 and 4-4 shown).

[0087] Please refer to Figure 5-2 , which respectively illustrate cross-sectional schematic diagrams of display devices 40a according to some embodiments of the present invention, wherein the same Figure 5-1 The components are denoted by the same reference numerals and their descriptions are omitted. In this embodiment, the structure of the display device 40a is similar to that of Figure 5-1 The structure of the display device 40 in FIG. 4 has the same advantages as the display device 40. Figure 5-1 In the structure of the display device 40, the second conductive layer 152 having a substantially flat surface 152c in the display device 40a covers the second electrode 140 of each light emitting unit 130. That is, the second conductive layer 152 in the display device 40a does not have Figure 5-1 The first surface 152a is shown.

[0088] In some embodiments, the first conductive layer 124 of the display device 40a may have an upper surface 124a that is the same as or similar to Figure 3 The upper surface 124a is shown.

[0089] In some embodiments, the display device 40a does not have the first surface 152a (eg, Figure 5-1 The second conductive layer 152 (shown in FIG. 1 ) covers the second electrode 140 of each light emitting unit 130. In the above case, similar to Figure 4-1 、 4-2 , 4-3 and 4-4 respectively show the display devices 30, 30a, 30b and 30c, the display device 40a may further include a scattering layer 155 (such as Figure 4-1 and 4-2 ), or a scattering layer 165 (as shown) disposed on the first conductive layer 124 and below the light emitting unit 130 Figure 4-3 and 4-4 shown).

[0090] Please refer to Figure 6-1 , which respectively illustrate cross-sectional schematic diagrams of display devices 50 according to some embodiments of the present invention, wherein the same Figure 2-1 The components are denoted by the same reference numerals and their descriptions are omitted. In this embodiment, the structure of the display device 40 is similar to that of Figure 2-1 The structure of the display device 10 in FIG. 1 has the same advantages as the display device 10. Figure 2-1 In the structure of the display device 10, the first semiconductor layer 134 of the light-emitting unit 130 has a surface 134a adjacent to the first electrode 132. Furthermore, the second semiconductor layer 138 of the light-emitting unit 130 has a surface 138a adjacent to the second electrode 140 and the surface farthest from the first conductive layer 124. The roughness of surface 138a is greater than that of surface 134a. As a result, the first surface 152a of the second conductive layer 152 and the underlying surface 138a of the second semiconductor layer 138 increase the viewing angle of light from the light-emitting unit 130, thereby improving the viewing angle efficiency of the display device 50.

[0091] In some embodiments, the second electrode 140 of each light emitting unit 130 in the display device 50 may have a rough surface adjacent to the second conductive layer 152, and the first electrode 132 may have a surface adjacent to the first conductive layer 124. The rough surface of the second electrode 140 and the surface of the first electrode 132 may be the same or similar to Figure 5-1 or Figure 5-2As shown, the first surface 152a of the second conductive layer 152, the rough surface of the second electrode 140, and the surface 138a of the second semiconductor layer 138 can increase the viewing angle of light from the light emitting unit 130, thereby increasing the viewing angle efficiency of the display device 50.

[0092] In some embodiments, the first conductive layer 124 of the display device 50 may have an upper surface 124a that is the same as or similar to Figure 3 The upper surface 124a is shown.

[0093] In some embodiments, similar to Figure 4-1 、 4-2 , 4-3 and 4-4 respectively show the display devices 30, 30a, 30b and 30c, the display device 50 may further include a scattering layer 155 (such as Figure 4-1 and 4-2 ), or a scattering layer 165 (as shown) disposed on the first conductive layer 124 and below the light emitting unit 130 Figure 4-3 and 4-4 shown).

[0094] Please refer to FIG. 6-2 , which illustrates a cross-sectional schematic diagram of a display device 50a according to some embodiments of the present invention. Components identical to those in FIG. 6-1 are labeled identically, and their descriptions are omitted. In this embodiment, the structure of display device 50a is similar to that of display device 50 in FIG. 6-1 , and thus offers the same advantages as display device 50 . However, unlike the structure of display device 50 in FIG. 6-1 , in display device 50a , a second conductive layer 152 having a substantially flat surface 152c covers the second electrode 140 of each light-emitting unit 130. That is, the second conductive layer 152 in display device 50a does not have the first surface 152a shown in FIG. 6-1 .

[0095] In some embodiments, the second electrode 140 of each light emitting unit 130 in the display device 50a may have a rough surface adjacent to the second conductive layer 152, and the first electrode 132 may have a surface adjacent to the first conductive layer 124. The rough surface of the second electrode 140 and the surface of the first electrode 132 may be the same or similar to Figure 5-1 or Figure 5-2 As shown, the first surface 152a of the second conductive layer 152, the rough surface of the second electrode 140, and the surface 138a of the second semiconductor layer 138 can increase the viewing angle of light from the light emitting unit 130, thereby increasing the viewing angle efficiency of the display device 50a.

[0096] In some embodiments, the first conductive layer 124 of the display device 50a may have an upper surface 124a that is the same as or similar to Figure 3 The upper surface 124a is shown.

[0097] In some embodiments, the display device 50a does not have the first surface 152a (eg, Figure 5-1 The second conductive layer 152 (shown in FIG. 1 ) covers the second electrode 140 of each light emitting unit 130. In the above case, similar to Figure 4-1 、 4-2 , 4-3 and 4-4 respectively show the display devices 30, 30a, 30b and 30c, the display device 50a may further include a scattering layer 155 (such as Figure 4-1 and 4-2 ), or a scattering layer 165 (as shown) disposed on the first conductive layer 124 and below the light emitting unit 130 Figure 4-3 and 4-4 shown).

[0098] According to the above embodiment, since the second conductive layer has a rough surface corresponding to at least one light-emitting unit or the first conductive layer in the recess of the second insulating layer when viewed from above, the viewing angle of the light from the light-emitting unit located below the rough surface of the second conductive layer is increased, thereby providing better viewing angle performance.

[0099] Furthermore, because the second conductive layer has a substantially flat surface corresponding to the area outside the first conductive layer when viewed from above, cracking of the second conductive layer adjacent to the conductive structure (which is electrically connected to the common line) can be avoided or mitigated. This allows for a better electrical connection between the second conductive layer and the common line, thereby increasing the reliability of the display device.

[0100] According to the above embodiment, since the first conductive layer has a rough upper surface or is covered by a scattering layer having a rough surface, the light emitting unit is disposed between two opposite rough surfaces. In this way, the viewing angle efficiency of the display device can be further improved.

[0101] According to the above embodiment, since the scattering layer with a rough surface (corresponding to the first conductive layer in the recess of the second insulating layer) covers the second conductive layer when viewed from above, the viewing angle efficiency of the display device can be further improved.

[0102] According to the above embodiments, since the second electrode and / or the second semiconductor layer of the light emitting unit has a rough upper surface when viewed from above, the viewing angle efficiency of the display device can be further improved.

[0103] The above briefly describes the features of several embodiments of the present invention so that those skilled in the art can more easily understand the present invention. Anyone skilled in the art will understand that the present invention can be easily used as a basis for modifying or designing other processes or structures to achieve the same objectives and / or obtain the same advantages as the embodiments described herein. Anyone skilled in the art will also understand that structures equivalent to the above do not depart from the spirit and scope of the present invention, and that modifications, substitutions, and modifications may be made without departing from the spirit and scope of the present invention.

Claims

1. A display device, comprising: a substrate; a driving circuit disposed on the substrate; an insulating layer, located above the driving circuit and having a notch; a first conductive layer electrically connected to the driving circuit; a light emitting unit disposed in the notch of the insulating layer, wherein the light emitting unit comprises a first semiconductor layer and a second semiconductor layer, and the first semiconductor layer is electrically connected to the first conductive layer; as well as a second conductive layer electrically connected to the second semiconductor layer, The first semiconductor layer has a first surface adjacent to the first conductive layer, and the second semiconductor layer has a second surface farthest from the first surface; the second conductive layer has a fifth surface and a sixth surface, the fifth surface corresponds to at least one light-emitting unit, and the sixth surface corresponds to an area outside the first conductive layer; as well as The roughness of the second surface is greater than the roughness of the first surface, and the roughness of the fifth surface is greater than the roughness of at least a portion of the sixth surface.

2. The display device according to claim 1, wherein: The light emitting unit further includes a first electrode disposed between the first conductive layer and the first semiconductor layer and a second electrode electrically connected to the second semiconductor layer; The first electrode has a third surface adjacent to the first conductive layer, and the second electrode has a fourth surface farthest from the second semiconductor layer; and The roughness of the fourth surface is greater than the roughness of the third surface. 3 . The display device as claimed in claim 1 , further comprising a first scattering layer disposed above the light emitting unit. 4 . The display device as claimed in claim 1 , further comprising a second scattering layer disposed on the first conductive layer and located below the light emitting unit.

5. A display device, comprising: a substrate; a driving circuit disposed on the substrate; an insulating layer, located above the driving circuit and having a notch; a first conductive layer electrically connected to the driving circuit; a light emitting unit disposed in the notch of the insulating layer and electrically connected to the first conductive layer, wherein the light emitting unit includes a second electrode and a second semiconductor layer electrically connected to the second electrode; as well as a second conductive layer electrically connected to the second electrode, The second electrode has a first surface farthest from the second semiconductor layer, and the second semiconductor layer has a second surface adjacent to the second electrode; the second conductive layer has a fourth surface and a fifth surface, the fourth surface corresponds to at least one light-emitting unit, and the fifth surface corresponds to an area outside the first conductive layer; as well as The roughness of the first surface is greater than the roughness of the second surface, and the roughness of the fourth surface is greater than the roughness of at least a portion of the fifth surface.

6. The display device according to claim 5, characterized in that The light emitting unit further includes a first semiconductor layer and a first electrode disposed between the first conductive layer and the first semiconductor layer; The first electrode has a third surface adjacent to the first conductive layer; as well as The roughness of the first surface is greater than the roughness of the third surface. 7 . The display device as claimed in claim 5 , further comprising a first scattering layer disposed above the light emitting unit. 8 . The display device as claimed in claim 5 , further comprising a second scattering layer disposed on the first conductive layer and located below the light emitting unit.

9. A display device, comprising: a substrate; a driving circuit disposed on the substrate; an insulating layer, located above the driving circuit and having a notch; a first conductive layer electrically connected to the driving circuit; a light emitting unit, the light emitting unit being disposed in the notch of the insulating layer and being electrically connected to the first conductive layer, the light emitting unit comprising a first electrode, a first semiconductor layer electrically connected to the first electrode, a second semiconductor layer and a second electrode electrically connected to the second semiconductor layer; as well as a second conductive layer electrically connected to the second electrode, The first electrode has a first surface farthest from the first semiconductor layer, and the second electrode has a second surface farthest from the second semiconductor layer; the second conductive layer has a fourth surface and a fifth surface, the fourth surface corresponds to at least one light-emitting unit, and the fifth surface corresponds to an area outside the first conductive layer; as well as The roughness of the second surface is greater than that of the first surface, and the roughness of the fourth surface is greater than that of at least a portion of the fifth surface. 10 . The display device as claimed in claim 9 , further comprising a first scattering layer disposed above the light emitting unit. 11 . The display device as claimed in claim 9 , further comprising a second scattering layer disposed on the first conductive layer and located below the light emitting unit.

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