Display device

Abstract

A display device comprises a driving backboard, a light-emitting element, a light control structure, a high-refractive-index layer and a light-transmitting packaging layer. The light-emitting element is arranged on the driving backboard. The light control structure is arranged on the driving backboard; the light control structure comprises a first part and a second part; the first part covers the side wall of the light-emitting element and is provided with a surface lower than the top surface of the light-emitting element; the second part is arranged on the first part; the first part and the second part define a groove; the high refractive index layer is arranged in the groove of the light control structure; the light-transmitting encapsulation layer covers the high refractive index layer and the light control structure.

Description

Technical Field

[0001] This invention relates to an optoelectronic device, and more particularly to a display device. Background Technology

[0002] A light-emitting diode (LED) display panel includes a driver backplane and multiple LED components mounted on the driver backplane. Inheriting the characteristics of LEDs, LED display panels offer advantages such as energy saving, high efficiency, high brightness, and fast response time. Furthermore, compared to organic light-emitting diode (OLED) display panels, LED display panels also offer advantages such as easier color calibration, longer lifespan, and no image burn-in. Therefore, LED display panels are considered the next generation of display technology. However, LED components require a large operating current. The higher the operating current, the lower the quantum conversion efficiency of the LED component, affecting the light extraction efficiency. Summary of the Invention

[0003] This invention provides a display device with excellent light emission efficiency.

[0004] The display device of the present invention includes a driving backplate, a light-emitting element, a light-controlling structure, a high-refractive-index layer, and a light-transmitting encapsulation layer. The light-emitting element is disposed on the driving backplate and electrically connected to it. The light-emitting element has a top surface and a sidewall. The top surface of the light-emitting element faces away from the driving backplate. The sidewall of the light-emitting element is located between the top surface of the light-emitting element and the driving backplate. The light-controlling structure is disposed on the driving backplate. The light-controlling structure includes a first part and a second part. The first part covers one sidewall of the light-emitting element and has a surface lower than the top surface of the light-emitting element. The second part is disposed on the first part. The first part and the second part define a groove. The high-refractive-index layer is disposed in the groove of the light-controlling structure. The light-transmitting encapsulation layer covers the high-refractive-index layer and the light-controlling structure. The refractive index of the high-refractive-index layer is greater than the refractive index of the light-transmitting encapsulation layer.

[0005] In one embodiment of the above-described display device, the first part of the light control structure contacts the sidewall of the light-emitting element.

[0006] In one embodiment of the above-described display device, the high refractive index layer is in contact with the top surface of the light-emitting element and the sidewall of the second part that defines the groove.

[0007] In one embodiment of the above-described display device, the high refractive index layer has a bottom surface facing the driving backplate, and the bottom surface of the high refractive index layer is lower than the top surface of the light-emitting element.

[0008] In one embodiment of the above-described display device, the high refractive index layer has a bottom surface facing the driving backplate and a top surface facing away from the driving backplate. The bottom surface and the top surface of the high refractive index layer are a distance in a direction perpendicular to the driving backplate. The light-emitting element has a thickness in the direction perpendicular to the driving backplate, and the distance is greater than the thickness.

[0009] In one embodiment of the above-described display device, the second part of the light control structure has a top surface facing away from the driving backplate, the high refractive index layer has a top surface facing away from the driving backplate, and a direction perpendicular to the driving backplate. The distance between the top surface of the second part and the driving backplate in that direction is substantially equal to the distance between the top surface of the high refractive index layer and the driving backplate in that direction.

[0010] In one embodiment of the above-described display device, it further includes:

[0011] A light-shielding pattern layer, wherein the second part of the light-controlling structure has a top surface facing away from the drive back plate, the light-shielding pattern layer is disposed on the top surface of the second part and has an opening, wherein the high refractive index layer and the light-emitting element are located below the opening of the light-shielding pattern layer.

[0012] In one embodiment of the aforementioned display device, the second part of the light-controlling structure has a sidewall defining the groove, and the sidewall of the light-controlling structure and the driving backplate form an angle within the material of the light-controlling structure, with the angle being at 45 degrees. o Up to 75 o The range.

[0013] In one embodiment of the above-described display device, it further includes:

[0014] A low refractive index layer is disposed on the high refractive index layer and located between the light-transmitting encapsulation layer and the high refractive index layer, wherein a refractive index of the low refractive index layer is less than the refractive index of the light-transmitting encapsulation layer.

[0015] In one embodiment of the above-mentioned display device, the first part and the second part of the light control structure are made of different materials, and the second part is light-transmitting.

[0016] In one embodiment of the above-described display device, it further includes:

[0017] A light-shielding pattern layer is disposed on the first part of the light-controlling structure and has an opening, wherein the light-emitting element is located in the opening of the light-shielding pattern layer, the second part of the light-controlling structure is disposed on the light-shielding pattern layer, and the refractive index of the high refractive index layer is greater than that of the light-transmitting second part.

[0018] In one embodiment of the above-described display device, the light-shielding pattern layer is in contact with the sidewall of the light-emitting element.

[0019] In one embodiment of the above-mentioned display device, the second part of the light control structure is integrally formed with the light-transmitting encapsulation layer. Attached Figure Description

[0020] Figure 1 This is a cross-sectional schematic diagram of a display device according to the first embodiment of the present invention.

[0021] Figure 2 This is a top view schematic diagram of the display device according to the first embodiment of the present invention.

[0022] Figure 3 The included angle of the display device according to the first embodiment of the present invention is shown. The relationship between relative light intensity.

[0023] Figure 4 This invention illustrates the relationship between the refractive index of the high refractive index layer and the relative light intensity of a display device according to a first embodiment of the present invention.

[0024] Figure 5 This is a cross-sectional schematic diagram of a display device according to a second embodiment of the present invention.

[0025] Figure 6 This is a cross-sectional schematic diagram of a display device according to a third embodiment of the present invention.

[0026] Figure 7 This is a top view schematic diagram of a display device according to a third embodiment of the present invention.

[0027] Figure 8 This illustrates the relationship between the high refractive index layer and relative light intensity in a display device according to a third embodiment of the present invention.

[0028] Figure 9 The included angle of the display device shown in the third embodiment of the present invention The relationship between relative light intensity.

[0029] Figure 10 This is a cross-sectional schematic diagram of a display device according to the fourth embodiment of the present invention.

[0030] Figure 11 This is a cross-sectional schematic diagram of a display device according to the fifth embodiment of the present invention.

[0031] Figure 12 This is a cross-sectional schematic diagram of a display device according to the sixth embodiment of the present invention.

[0032] In the attached figures, the following labels are used:

[0033] 10, 10A, 10B, 10C, 10D, 10E: Display devices

[0034] 110: Drive backplane

[0035] 112: Connector assembly

[0036] 112a, 112b: Sealing pads

[0037] 120: Light-emitting element

[0038] 120a, 132b, 140a: Top surface

[0039] 120b, 132a: Sidewall

[0040] 122: First electrode

[0041] 124: Second electrode

[0042] 130, 130B, 130D: Light control structure

[0043] 130a: Groove

[0044] 131: Part One

[0045] 131a: Surface

[0046] 132, 132B, 132D: Part Two

[0047] 140: High Refractive Index Layer

[0048] 140b: Bottom surface

[0049] 150: Transparent Encapsulation Layer

[0050] 160, 160B, 160C, 160E: Light-blocking patterned layers

[0051] 162: Opening

[0052] 170: Translucent planarization layer

[0053] 180: Low refractive index layer

[0054] D1, D2, D3: Distance

[0055] I, I': interface

[0056] L: Beam

[0057] T120: Thickness

[0058] T140: Distance

[0059] x, z: Direction

[0060] Angle Detailed Implementation

[0061] Reference will now be made in detail to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same component symbols are used in the drawings and description to denote the same or similar parts.

[0062] It should be understood that when a component such as a layer, film, region, or substrate is referred to as being "on" or "connected" to another component, it may be directly on or connected to the other component, or an intermediate component may also be present. Conversely, when a component is referred to as being "directly on" or "directly connected" to another component, no intermediate component is present. As used herein, "connection" can refer to physical and / or electrical connection. Furthermore, "electrical connection" or "coupling" may mean the presence of other components between the two components.

[0063] As used herein, “about,” “approximately,” or “substantially” includes the value and the average value within an acceptable range of deviations from a particular value as determined by one of ordinary skill in the art, taking into account the measurement under discussion and a particular number of errors associated with the measurement (i.e., limitations of the measurement system). For example, “about” may mean within one or more standard deviations of the value, or within ±30%, ±20%, ±10%, ±5%. Furthermore, the use of “about,” “approximately,” or “substantially” herein may be chosen based on the optical, etched, or other properties to select a more acceptable range of deviations or standard deviations, and may not require a single standard deviation to apply to all properties.

[0064] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having the same meaning as they have in the context of the relevant technology and the invention, and will not be interpreted as having an idealized or overly formal meaning unless expressly defined herein.

[0065] Figure 1 This is a cross-sectional schematic diagram of a display device according to the first embodiment of the present invention. Figure 2 This is a top view schematic diagram of the display device according to the first embodiment of the present invention. Figure 2 The light-emitting element 120, high refractive index layer 140, light control structure 130 and light-shielding pattern layer 160 of the display device 10 are shown, while other components of the display device 10 are omitted.

[0066] Please refer to Figure 1 and Figure 2 The display device 10 includes a driving backplate 110. In some embodiments, the driving backplate 110 includes a substrate (not shown), a pixel driving circuit (not shown) disposed on the substrate, and a pad assembly 112 electrically connected to the pixel driving circuit.

[0067] For example, in some embodiments, the substrate material may be glass, quartz, organic polymer, or other suitable materials. The pixel driving circuit may include data lines (not shown), scan lines (not shown), power lines (not shown), common lines (not shown), a first transistor (not shown), a second transistor (not shown), and a capacitor (not shown). The first terminal of the first transistor is electrically connected to the data line, the control terminal of the first transistor is electrically connected to the scan line, the second terminal of the first transistor is electrically connected to the control terminal of the second transistor, the first terminal of the second transistor is electrically connected to the power line, the capacitor is electrically connected to the second terminal of the first transistor and the first terminal of the second transistor, and the plurality of pads 112a and 112b of the pad group 112 are respectively electrically connected to the second terminal of the second transistor and the common line, but the present invention is not limited thereto.

[0068] The display device 10 further includes a light-emitting element 120 disposed on a driving backplate 110. The light-emitting element 120 has a top surface 120a and a sidewall 120b. The top surface 120a of the light-emitting element 120 faces away from the driving backplate 110. The sidewall 120b of the light-emitting element 120 is located between the top surface 120a of the light-emitting element 120 and the driving backplate 110. The light-emitting element 120 is electrically connected to the driving backplate 110. Specifically, in some embodiments, the light-emitting element 120 includes a first semiconductor layer (not shown), a second semiconductor layer (not shown), an active layer (not shown) disposed between the first semiconductor layer and the second semiconductor layer, a first electrode 122 electrically connected to the first semiconductor layer, and a second electrode 124 electrically connected to the second semiconductor layer, wherein the first electrode 122 and the second electrode 124 are respectively bonded to a plurality of pads 112a and 112b of the driving backplate 110. In some embodiments, the light-emitting element 120 is, for example, a micro-light-emitting diode (μLED), but the invention is not limited thereto.

[0069] The display device 10 also includes a light control structure 130 disposed on the drive backplate 110. The light control structure 130 includes a first part 131 and a second part 132. The first part 131 covers the sidewall 120b of the light-emitting element 120 and has a surface 131a lower than the top surface 120a of the light-emitting element 120. The second part 132 is disposed on the first part 131. The first part 131 and the second part 132 together define a recess 130a. The light-emitting element 120 is disposed in the recess 130a. The second part 132 of the light control structure 130 has a sidewall 132a defining the recess 130a. The sidewall 132a can reflect and / or scatter the light beam L emitted by the light-emitting element 120.

[0070] Please refer to Figure 1 The sidewall 132a of the light control structure 130 and the drive backplate 110 have an angle within the material of the light control structure 130. . Figure 3The included angle of the display device 10 according to the first embodiment of the present invention is shown. The relationship between relative light intensity. Please refer to... Figure 1 and Figure 3 In some embodiments, the included angle Landing at 45 o Up to 75 o The scope. By Figure 3 The data shows that in some embodiments, the included angle It fell to 56 o Up to 64 o When the range is within the specified range, the display device 10 can have a high relative light intensity.

[0071] Please refer to Figure 1 and Figure 2 In some embodiments, the first portion 131 of the light-controlling structure 130 may directly cover the sidewall 120b of the light-emitting element 120. In some embodiments, the light-controlling structure 130 may include a substrate (e.g., resin) and a plurality of scattering particles (e.g., titanium dioxide particles) dispersed in the substrate, but the present invention is not limited thereto. In some embodiments, the light-controlling structure 130 may be, for example, a white light-controlling structure, but the present invention is not limited thereto.

[0072] The display device 10 further includes a high refractive index layer 140 disposed on the light-emitting element 120 and in the groove 130a of the light-controlling structure 130. The display device 10 also includes a light-transmitting encapsulation layer 150 covering the high refractive index layer 140 and the light-controlling structure 130. The refractive index of the high refractive index layer 140 is greater than the refractive index of the light-transmitting encapsulation layer 150. Figure 4 This diagram illustrates the relationship between the refractive index of the high-refractive-index layer and the relative light intensity of the display device according to a first embodiment of the present invention. Please refer to... Figure 1 and Figure 4 In some embodiments, the refractive index of the high-refractive-index layer 140 is preferably greater than or equal to 1.7. Figure 4 The data shows that when the refractive index of the high refractive index layer 140 is greater than or equal to 1.7, the display device 10 has a higher relative light intensity. For example, in some embodiments, the refractive index of the high refractive index layer 140 may be 1.77, and the refractive index of the light-transmitting encapsulation layer 150 may be 1.5, but the present invention is not limited thereto.

[0073] Please refer to Figure 1 In some embodiments, the high refractive index layer 140 contacts the top surface 120a of the light-emitting element 120 and the sidewall 132a of the defining groove 130a of the second portion 132. In some embodiments, the high refractive index layer 140 has a bottom surface 140b facing the driving back plate 110 and a top surface 140a facing away from the driving back plate 110, and the bottom surface 140b of the high refractive index layer 140 is lower than the top surface 120a of the light-emitting element 120.

[0074] In some embodiments, the bottom surface 140b and top surface 140a of the high refractive index layer 140 have a distance T140 in the direction z perpendicular to the driving back plate 110, and the light-emitting element 120 has a thickness T120 in the direction z perpendicular to the driving back plate 110, and the distance T140 is greater than the thickness T120.

[0075] In some embodiments, the second portion 132 of the light-controlling structure 130 has a top surface 132b facing away from the driving backplate 110, and the high refractive index layer 140 has a top surface 140a facing away from the driving backplate 110. The distance D1 between the top surface 132b of the second portion 132 of the light-controlling structure 130 and the driving backplate 110 in the z-direction is substantially equal to the distance D2 between the top surface 140a of the high refractive index layer 140 and the driving backplate 110 in the z-direction. In some embodiments, the x-direction is parallel to the driving backplate 110, and the sidewall 120b of the light-emitting element 120 and the sidewall 132a of the light-controlling structure 130 have a distance D3 in the x-direction, where the distance D3 is greater than or equal to the distance of a light-emitting element bonding offset.

[0076] In some embodiments, the display device 10 further includes a light-shielding pattern layer 160. The second portion 132 of the light-controlling structure 130 has a top surface 132b facing away from the driving backplate 110. The light-shielding pattern layer 160 is disposed on the top surface 132b of the second portion 132 of the light-controlling structure 130 and has an opening 162. The high-refractive-index layer 140 and the light-emitting element 120 are located below the opening 162 of the light-shielding pattern layer 160. The solid portion of the light-shielding pattern layer 160 does not obscure the high-refractive-index layer 140. The light-shielding pattern layer 160 is located between the light-transmitting encapsulation layer 150 and the light-controlling structure 130. The light-shielding pattern layer 160 obscures the top surface 132b of the light-controlling structure 130 to reduce the probability of external light being reflected by the light-controlling structure 130, thereby improving the optical performance of the display device 10.

[0077] In some embodiments, the display device 10 may optionally include a light-transmitting planarization layer 170. The light-transmitting planarization layer 170 is disposed on the drive backplane 110. A light-controlling structure 130 is located within the light-transmitting planarization layer 170. In addition to the high-refractive-index layer 140 and the light-shielding pattern layer 160, a light-transmitting encapsulation layer 150 further covers the light-transmitting planarization layer 170. The refractive index of the high-refractive-index layer 140 is greater than the refractive index of the light-transmitting planarization layer 170.

[0078] It is worth mentioning that by providing a high refractive index layer 140 in the groove 130a, the main interface for the reflection of the light beam L becomes the interface I between the light-transmitting encapsulation layer 150 and the high refractive index layer 140, which is closer to the light-emitting element 120. The light beam L emitted at a large angle will first undergo total internal reflection at the interface I, and then be reflected and / or scattered by the sidewall 132a of the controlled light structure 130, thus redistributing it. In this way, the probability of the light beam L leaving the interior of the display device 10 can be increased, and the light emission efficiency of the light-emitting element 120 in the viewing direction z is also significantly improved.

[0079] For example, the difference between a comparative display device (not shown) and the display device 10 of the first embodiment is that the comparative display device does not include the light control structure 130 and the high refractive index layer 140 of the display device 10 of the first embodiment, and the light-transmitting encapsulation layer of the comparative display device directly covers the light-emitting element; compared with the comparative display device, the light emission efficiency of the display device 10 of the first embodiment can be improved by 67%.

[0080] It must be noted that the following embodiments use the component reference numerals and some content from the foregoing embodiments, with the same reference numerals used to represent the same or similar components, and descriptions of the same technical content omitted. For explanations of the omitted parts, please refer to the foregoing embodiments; these will not be repeated in the following embodiments.

[0081] Figure 5 This is a cross-sectional schematic diagram of a display device according to a second embodiment of the present invention. Please refer to... Figure 1 and Figure 5 , Figure 5 The display device 10A of the second embodiment and Figure 1 The display device 10 of the first embodiment is similar, except that: Figure 5 The display device 10A of the second embodiment also includes a low refractive index layer 180. Please refer to... Figure 1 A low-refractive-index layer 180 is disposed on top of a high-refractive-index layer 140 and located between a light-transmitting encapsulation layer 150 and a high-refractive-index layer 140. The refractive index of the low-refractive-index layer 180 is less than that of the light-transmitting encapsulation layer 150. Adding an additional low-refractive-index layer 180 on top of the high-refractive-index layer 140 can increase the redistribution of the light beam on the reflecting surface, further increasing the light extraction efficiency.

[0082] Figure 6 This is a cross-sectional schematic diagram of a display device according to a third embodiment of the present invention. Figure 7 This is a top view schematic diagram of a display device according to a third embodiment of the present invention. Figure 7 The light-emitting element 120, the high refractive index layer 140, and the light-transmitting planarization layer 170 of the display device 10B are shown, while other components of the display device 10B are omitted.

[0083] Please refer to Figure 6 and Figure 7 The display device 10B of the third embodiment is similar to the display device 10 of the first embodiment. The difference between the two is that the light control structures 130 and 130B are different, and the positions of the light-shielding pattern layers 160 and 160B are different.

[0084] Please refer to Figure 6 and Figure 7 The display device 10B includes a driving backplate 110, a light-emitting element 120, a light-controlling structure 130B, a high-refractive-index layer 140, and a light-transmitting encapsulation layer 150. The light-emitting element 120 is disposed on and electrically connected to the driving backplate 110. The light-emitting element 120 has a top surface 120a and a sidewall 120b. The top surface 120a of the light-emitting element 120 faces away from the driving backplate 110. The sidewall 120b of the light-emitting element 120 is located between the top surface 120a of the light-emitting element 120 and the driving backplate 110. The light-controlling structure 130B is disposed on the driving backplate 110. The light-controlling structure 130B includes a first portion 131 and a second portion 132B. The first portion 131 covers the sidewall 120b of the light-emitting element 120 and has a surface 131a lower than the top surface 120a of the light-emitting element 120. The second portion 132B is disposed on the first portion 131. The first part 131 and the second part 132B define a groove 130a. A high refractive index layer 140 is disposed in the groove 130a of the light control structure 130B. A light-transmitting encapsulation layer 150 covers the high refractive index layer 140 and the light control structure 130B. The refractive index of the high refractive index layer 140 is greater than the refractive index of the light-transmitting encapsulation layer 150.

[0085] Unlike the first embodiment, in this embodiment, the first part 131 and the second part 132B of the light-controlling structure 130B are made of different materials. The first part 131 can reflect and / or scatter the light beam L, while the second part 132B is transparent. The refractive index of the high-refractive-index layer 140 is greater than that of the second part 132B of the light-controlling structure 130B. In this embodiment, a portion of the light-transmitting planarization layer 170 can be used as the second part 132B of the light-controlling structure 130B. The high-refractive-index layer 140 and the light-transmitting planarization layer 170 have an inclined junction I'. The inclined junction I' can deflect the light beam L emitted at a large angle towards the forward-looking direction z, thereby increasing the light extraction efficiency.

[0086] For example, the difference between a comparative display device (not shown) and the display device 10B of the third embodiment is that the comparative display device does not include the light control structure 130B and the high refractive index layer 140 of the display device 10B of the third embodiment, while the light-transmitting encapsulation layer of the comparative display device directly covers the light-emitting element; compared with the comparative display device, the light emission efficiency of the display device 10B of the third embodiment can be improved by 50%.

[0087] Furthermore, in this embodiment, the light-shielding pattern layer 160B is disposed on the first part 131 of the light-controlling structure 130B and has an opening 162, wherein the light-emitting element 120 is located in the opening 162 of the light-shielding pattern layer 160B, the second part 132B of the light-controlling structure 130B is disposed on the light-shielding pattern layer 160B, and the light-shielding pattern layer 160B is disposed between the first part 131 and the second part 132B of the light-controlling structure 130B.

[0088] Figure 8 This illustrates the relationship between the high refractive index layer and relative light intensity in a display device according to a third embodiment of the present invention. Please refer to... Figure 6 and Figure 8 In some embodiments, the refractive index of the high-refractive-index layer 140 is preferably greater than or equal to 1.7. Figure 8 The data shows that when the refractive index of the high refractive index layer 140 is greater than or equal to 1.7, the display device 10B has a higher relative light intensity. For example, in some embodiments, the refractive index of the high refractive index layer 140 may be 1.77, and the refractive index of the light-transmitting planarization layer 170 may be 1.5, but the present invention is not limited thereto.

[0089] Figure 9 The included angle of the display device 10B according to the third embodiment of the present invention is shown. The relationship between relative light intensity. The sidewall 132a of the light control structure 130B and the drive backplate 110 have an angle within the material of the light control structure 130B. Please refer to Figure 6 and Figure 9 In some embodiments, the included angle Landing at 45 o Up to 75 o The scope. By Figure 9 The data shows that the included angle Landing at 58 o Up to 66 o When the range is within the range, the display device 10B can have a higher relative light intensity.

[0090] Figure 10 This is a cross-sectional schematic diagram of a display device according to a fourth embodiment of the present invention. Please refer to... Figure 9 and Figure 10 The display device 10C of the fourth embodiment is similar to the display device 10B of the third embodiment, except that the light-shielding pattern layers 160 and 160C are different. Please refer to... Figure 10 Specifically, in this embodiment, the light-shielding pattern layer 160C contacts the sidewall 120b of the light-emitting element 120. In this embodiment, the display device 10C can be a non-transparent display, so that the light-shielding pattern layer 160C extends to the sidewall 120b of the light-emitting element 120 and surrounds the light-emitting element 120, which can reduce the reflectivity of the display device 10C.

[0091] Figure 11 This is a cross-sectional schematic diagram of a display device according to the fifth embodiment of the present invention. Please refer to... Figure 6 and Figure 11 The display device 10D of the fifth embodiment is similar to the display device 10B of the third embodiment, except that the light control structures 130B and 130D are different. Specifically, in this embodiment, the second part 132D of the light control structure 130D is integrally formed with the light-transmitting encapsulation layer 150. That is, in this embodiment, a portion of the light-transmitting encapsulation layer 150 is used as the second part 132D of the light control structure 130D.

[0092] Figure 12 This is a cross-sectional schematic diagram of a display device according to the sixth embodiment of the present invention. Please refer to... Figure 11 and Figure 12 The display device 10E of the sixth embodiment is similar to the display device 10D of the fifth embodiment, except that the light-shielding pattern layers 160C and 160E are different. Please refer to... Figure 12 Specifically, in this embodiment, the light-shielding pattern layer 160E contacts the sidewall 120b of the light-emitting element 120.

Claims

1. A display device, characterized by comprising: Including: a driving backplate; a light emitting element disposed on the driving backplate and electrically connected to the driving backplate, wherein the light emitting element has a top surface and a sidewall, the top surface of the light emitting element faces away from the driving backplate, and the sidewall of the light emitting element is located between the top surface of the light emitting element and the driving backplate; a light control structure disposed on the driving backplate, wherein the light control structure comprises: a first portion covering a sidewall of the light emitting element and having a surface lower than the top surface of the light emitting element; and a second portion disposed on the first portion, wherein the first portion and the second portion define a groove; a high refractive index layer disposed in the groove of the light control structure; and a light transmissive encapsulation layer covering the high refractive index layer and the light control structure, wherein a refractive index of the high refractive index layer is greater than a refractive index of the light transmissive encapsulation layer.

2. The display device of claim 1, wherein, The first portion of the light control structure contacts the sidewall of the light emitting element.

3. The display device of claim 1, wherein, The high refractive index layer contacts the top surface of the light emitting element and a sidewall of the second portion defining the groove.

4. The display device of claim 1, wherein, The high refractive index layer has a bottom surface facing the driving backplate, and the bottom surface of the high refractive index layer is lower than the top surface of the light emitting element.

5. The display device of claim 1, wherein, The high refractive index layer has a bottom surface facing the driving backplate and a top surface facing away from the driving backplate, the bottom surface and the top surface of the high refractive index layer have a distance in a direction perpendicular to the driving backplate, the light emitting element has a thickness in the direction perpendicular to the driving backplate, and the distance is greater than the thickness.

6. The display device of claim 1, wherein, The second portion of the light control structure has a top surface facing away from the driving backplate, the high refractive index layer has a top surface facing away from the driving backplate, a direction is perpendicular to the driving backplate, and a distance of the top surface of the second portion from the driving backplate in the direction is substantially equal to a distance of the top surface of the high refractive index layer from the driving backplate in the direction.

7. The display device of claim 1, wherein, Further comprising: a light shielding pattern layer, wherein the second portion of the light control structure has a top surface facing away from the driving backplate, the light shielding pattern layer is disposed on the top surface of the second portion and has an opening, and the high refractive index layer and the light emitting element are located under the opening of the light shielding pattern layer.

8. The display device of claim 1, wherein, The second portion of the light control structure has a sidewall defining the groove. The sidewall of the light control structure and the driving back plate have an included angle within the material of the light control structure, and the included angle falls within the range of 45 o to 75 o .

9. The display device of claim 1, wherein, Further comprising: a low refractive index layer disposed on the high refractive index layer and located between the light transmissive encapsulation layer and the high refractive index layer, wherein a refractive index of the low refractive index layer is less than the refractive index of the light transmissive encapsulation layer.

10. The display device of claim 1, wherein, The first portion and the second portion of the light control structure are made of different materials, and the second portion is light transmissive.

11. The display device of claim 10, wherein, Further comprising: a light shielding pattern layer disposed on the first portion of the light control structure and having an opening, wherein the light emitting element is located in the opening of the light shielding pattern layer, the second portion of the light control structure is disposed on the light shielding pattern layer, and the high refractive index layer has a refractive index greater than the light transmissive second portion.

12. The display device of claim 11, wherein, The light shielding pattern layer contacts the sidewall of the light emitting element.

13. The display device of claim 1, wherein, The second portion of the light control structure is integrally formed with the light transmissive encapsulation layer.

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