Display device

Abstract

The invention discloses a display device which comprises a plurality of pixel units. Each pixel unit comprises an embankment layer, a first light-emitting element, a second light-emitting element, a third light-emitting element, a first color conversion structure, a first scattering structure and a second scattering structure. The plurality of openings of the bank layer are arranged in a plurality of rows and a plurality of columns along the row direction and the column direction. The first light-emitting element, the second light-emitting element and the third light-emitting element are located in the first opening, the second opening and the third opening of the bank layer respectively. The first color conversion structure is arranged in the first opening. The first scattering structure is arranged in the second opening. The second scattering structure is arranged in the third opening. The first color conversion structure and the first scattering structure are arranged in a first direction. The first scattering structure and the second scattering structure are arranged in the second direction. The first direction, the second direction, the row direction and the column direction are mutually staggered.

Description

Technical Field

[0001] The invention relates to a display device. Background Art

[0002] The light-emitting diode display panel includes a driving circuit substrate and a plurality of light-emitting diode elements transferred to the driving circuit substrate. Inheriting the characteristics of light-emitting diodes, the light-emitting diode display panel has the advantages of power saving, high efficiency, high brightness and fast response time. In addition, compared with the organic light-emitting diode display panel, the light-emitting diode display panel also has the advantages of easy color adjustment, long luminous life and no image imprinting. Therefore, the light-emitting diode display panel is regarded as the next generation of display technology. In the light-emitting diode display panel of the current architecture, a plurality of light-emitting diode elements are covered with a color conversion structure and a scattering structure to use the optical characteristics of the sub-pixels emitting various colors to be close. However, when the scattering material layer is patterned to form a plurality of scattering structures, part of the scattering material layer is easy to remain in the plurality of scattering structures, so that the film surface height of the bank layer formed subsequently is uneven, affecting the optical performance of the light-emitting diode display panel. Summary of the invention

[0003] The invention provides a display device with good optical performance.

[0004] The display device of the present invention includes a driving circuit substrate and a plurality of pixel units. Each pixel unit includes a bank layer, a first light-emitting element, a second light-emitting element, a third light-emitting element, a first color conversion structure, a first scattering structure and a second scattering structure. The bank layer is disposed on the driving circuit substrate and has a plurality of openings. The plurality of openings of the bank layer are arranged in a plurality of rows and a plurality of columns along the row direction and the column direction. The plurality of openings of the bank layer include a first opening, a second opening and a third opening. The first light-emitting element, the second light-emitting element and the third light-emitting element are disposed on the driving circuit substrate, electrically connected to the driving circuit substrate, and are respectively located in the first opening, the second opening and the third opening of the bank layer. The first color conversion structure is disposed in the first opening of the bank layer and covers the first light-emitting element. The first scattering structure is disposed in the second opening of the bank layer and covers the second light-emitting element. The second scattering structure is disposed in the third opening of the bank layer and covers the third light-emitting element. The first color conversion structure and the first scattering structure respectively covering the first light-emitting element and the second light-emitting element are arranged in a first direction. The first direction is interlaced with the row direction and the column direction. The first scattering structure and the second scattering structure respectively covering the second light emitting element and the third light emitting element are arranged in a second direction. The second direction is staggered with the row direction and the column direction, and the first direction is staggered with the second direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] Figure 1 FIG. 1 is a top view and perspective view of a display device according to an embodiment of the present invention.

[0006] Figure 2 It is a cross-sectional schematic diagram of a display device according to an embodiment of the present invention.

[0007] Figure 3 It is a cross-sectional schematic diagram of a display device according to an embodiment of the present invention.

[0008] Figure 4 FIG. 4 is a schematic diagram of an equivalent circuit of a display device according to an embodiment of the present invention.

[0009] Figure 5 FIG. 4 is a top view and perspective view of a display device according to another embodiment of the present invention.

[0010] Wherein, the reference numerals are:

[0011] 10.10A: Display device

[0012] 110: driving circuit substrate

[0013] 112: pad group

[0014] 112a, 112b: pads

[0015] 112M-1, 112M-2, 112M-3: Main pad group

[0016] 112R-1, 112R-2, 112R-3: Spare pad set

[0017] 120: Bank layer

[0018] 121, 122, 123, 124, 125, 126: Open

[0019] 131: first light emitting element

[0020] 132: Second light emitting element

[0021] 133: third light emitting element

[0022] 141: First color conversion structure

[0023] 142: Second color conversion structure

[0024] 151: First scattering structure

[0025] 152: Second scattering structure

[0026] 161: First transparent structure

[0027] 162: Second transparent structure

[0028] C: Capacitor

[0029] CL: Common Line

[0030] C n , C n+1 , C n+2 :List

[0031] DL: Data line

[0032] d1: first direction

[0033] d2: second direction

[0034] GL: Scan Line

[0035] PL: Power line

[0036] PX, PXA: pixel unit

[0037] R m , R m+1 :List

[0038] SPC, SPC1, SPC2, SPC3: Sub-pixel driving circuit

[0039] T1: The first transistor

[0040] T1a, T2a: First end

[0041] T1b, T2b: Second end

[0042] T1c, T2c: control end

[0043] T2: Second transistor

[0044] x: row direction

[0045] y:column direction

[0046] I-I', II-II': section line DETAILED DESCRIPTION

[0047] 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.

[0048] 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 may be directly on or connected to another element, or an intermediate element may also exist. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intermediate elements. As used herein, "connection" may refer to physical and / or electrical connection. Furthermore, "electrical connection" or "coupling" may refer to the presence of other elements between two elements.

[0049] As used herein, "about", "approximately", or "substantially" includes the stated value and the average value within an acceptable deviation range of the particular value determined by one of ordinary skill in the art, taking into account the measurement in question and the particular amount of error associated with the measurement (i.e., the limitations of the measurement system). For example, "about" can mean within one or more standard deviations of the stated value, or within ±30%, ±20%, ±10%, ±5%. Furthermore, as used herein, "about", "approximately", or "substantially" can select a more acceptable deviation range or standard deviation depending on the optical property, etching property or other property, and can apply to all properties without a single standard deviation.

[0050] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the invention belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and the present invention, and will not be interpreted as an idealized or overly formal meaning unless explicitly defined as such herein.

[0051] Figure 1 FIG. 1 is a top view and perspective view of a display device according to an embodiment of the present invention. Figure 2 It is a cross-sectional schematic diagram of a display device according to an embodiment of the present invention. Figure 2 correspond Figure 1 Section line I-I'. Figure 3 It is a cross-sectional schematic diagram of a display device according to an embodiment of the present invention. Figure 3 correspond Figure 1 Section line II-II'. Figure 4 FIG. 4 is a schematic diagram of an equivalent circuit of a display device according to an embodiment of the present invention. Figure 1 , Figure 2 , Figure 3 and Figure 4 A pixel unit PX of the display device 10 is shown as an example. Figure 1 , Figure 2 , Figure 3 , Figure 4 The following description should be able to implement the entire display device 10, and multiple pixel units PX will not be repeatedly illustrated here.

[0052] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 The display device 10 includes a driving circuit substrate 110. The driving circuit substrate 110 includes a plurality of sub-pixel driving circuits SPC (shown in FIG. Figure 4) and a plurality of pad groups 112 electrically connected to a plurality of sub-pixel driving circuits SPC, wherein each pad group 112 includes at least one pad 112a, 112b.

[0053] Please refer to Figure 4 For example, in some embodiments, each sub-pixel driving circuit SPC may include a first transistor T1, a second transistor T2 and a capacitor C, wherein the first end T1a of the first transistor T1 is electrically connected to a corresponding data line DL, the control end T1c of the first transistor T1 is electrically connected to a corresponding scan line GL, the second end T1b of the first transistor T1 is electrically connected to the control end T2c of the second transistor T2, the first end T2a of the second transistor T2 is electrically connected to a corresponding power line PL, the capacitor C is electrically connected to the second end T1b of the first transistor T1 and the first end T2a of the second transistor T2, and the second end T2b of the second transistor T2 is electrically connected to a corresponding pad group 112. Please refer to Figure 1 and Figure 4 In some embodiments, each pad group 112 may selectively include a plurality of pads 112a and 112b, wherein one pad 112a may be electrically connected to a corresponding sub-pixel driving circuit SPC, and another pad 112b may be electrically connected to a corresponding common line CL. However, the present invention is not limited thereto, and in other embodiments, each pad group 112 may include only one pad 112a.

[0054] Please refer to Figure 1 , Figure 2 and Figure 3 The display device 10 further includes a plurality of pixel units PX. Each pixel unit PX includes a bank layer 120 disposed on the driving circuit substrate 110 and having a plurality of openings 121, 122, 123, 124, 125, and 126. Figure 1 The plurality of openings 121, 122, 123, 124, 125, 126 of the bank layer 120 are arranged in a plurality of rows C along the column direction y and the row direction x. n , C n+1 , C n+2 with multiple lines of R m , R m+1 , wherein the column direction y is interlaced with the row direction x. For example, in some embodiments, the column direction y and the row direction x may be substantially perpendicular, but the invention is not limited thereto.

[0055] Please refer to Figure 1In some embodiments, the plurality of openings 121, 122, 123, 124, 125, 126 of the bank layer 120 of each pixel unit PX may include a first opening 121, a second opening 122, a third opening 123, a fourth opening 124, a fifth opening 125, and a sixth opening 126, wherein the first opening 121, the fourth opening 124, and the third opening 123 are located in a row R m The sixth opening 126, the second opening 122 and the fifth opening 125 are located in the next row R m+1 The first opening 121 and the sixth opening 126 are located in a row C n The fourth opening 124 and the second opening 122 are located in the next row C n+1 , and the third opening 123 and the fifth opening 125 are located in the next row C n+2 .

[0056] The first opening 121, the fourth opening 124 and the third opening 123 are arranged in the row direction x, and the fourth opening 124 is located between the first opening 121 and the third opening 123. The sixth opening 126, the second opening 122 and the fifth opening 125 are arranged in the row direction x, and the second opening 122 is located between the sixth opening 126 and the fifth opening 125. The sixth opening 126 and the first opening 121 are arranged in the column direction y. The second opening 122 and the fourth opening 124 are arranged in the column direction y. The fifth opening 125 and the third opening 123 are arranged in the column direction y. In some embodiments, the material of the bank layer 120 may selectively be reflective, but the present invention is not limited thereto. In some embodiments, the color of the bank layer 120 may selectively be white, but the present invention is not limited thereto.

[0057] Please refer to Figure 1 and Figure 4 In some embodiments, a plurality of pad groups 112 located in a plurality of openings 121, 122, 123, 124, 125, and 126 of the same pixel unit PX are electrically connected to a plurality of sub-pixel driving circuits SPC, and these sub-pixel driving circuits SPC are electrically connected to the same scan line GL.

[0058] Please refer to Figure 1 and Figure 4In some embodiments, the plurality of pad groups 112 of the driving circuit substrate 110 may include a plurality of main pad groups 112M-1, 112M-2, 112M-3 and a plurality of spare pad groups 112R-1, 112R-2, 112R-3, wherein each spare pad group 112R-1 / 112R-2 / 112R-3 is electrically connected to a corresponding main pad group 112M-1 / 112M-2 / 112M-3. For example, in some embodiments, the main pad group 112M-1 and the spare pad group 112R-1 located at the first opening 121 and the sixth opening 126, respectively, are electrically connected to each other, the spare pad group 112R-2 and the main pad group 112M-2 located at the fourth opening 124 and the second opening 122, respectively, are electrically connected to each other, and the main pad group 112M-3 and the spare pad group 112R-3 located at the third opening 123 and the fifth opening 125, respectively, are electrically connected to each other.

[0059] Specifically, in some embodiments, the plurality of sub-pixel driving circuits SPC include a first sub-pixel driving circuit SPC1, a second sub-pixel driving circuit SPC2, and a third sub-pixel driving circuit SPC3; a pad 112a of the main pad group 112M-1 located at the first opening 121 and a pad 112a of the spare pad group 112R-1 located at the sixth opening 126 are both electrically connected to the first sub-pixel driving circuit SPC1, another pad 112b of the main pad group 112M-1 located at the first opening 121 and another pad 112b of the spare pad group 112R-1 located at the sixth opening 126 are electrically connected to the same common line CL; a pad 112a of the spare pad group 112R-2 located at the fourth opening 124 and a main pad 112a of the spare pad group 112R-2 located at the second opening 122 are electrically connected to the same common line CL. A pad 112a of the pad group 112M-1 is electrically connected to the second sub-pixel driving circuit SPC3, another pad 112b of the spare pad group 112R-2 located at the fourth opening 124 and another pad 112b of the main pad group 112M-1 located at the second opening 122 are electrically connected to the same common line CL; a pad 112a of the main pad group 112M-3 located at the third opening 123 and a pad 112a of the spare pad group 112R-3 located at the fifth opening 125 are electrically connected to the second sub-pixel driving circuit SPC2, another pad 112b of the main pad group 112M-3 located at the third opening 123 and another pad 112b of the spare pad group 112R-3 located at the fifth opening 125 are electrically connected to the same common line CL.

[0060] Please refer to Figure 1 , Figure 2 and Figure 3, each pixel unit PX of the display device 10 further includes a first light-emitting element 131, a second light-emitting element 132, and a third light-emitting element 133. The first light-emitting element 131, the second light-emitting element 132, and the third light-emitting element 133 are respectively located in the first opening 121, the second opening 122, and the third opening 123 of the bank layer 120. The first light-emitting element 131, the second light-emitting element 132, and the third light-emitting element 133 are disposed on the driving circuit substrate 110 and are electrically connected to the driving circuit substrate 110. In detail, in some embodiments, the first light-emitting element 131, the second light-emitting element 132, and the third light-emitting element 133 are respectively bonded to the main pad group 112M-1, the main pad group 112M-2, and the main pad group 112M-3 of the driving circuit substrate 110. For example, in some embodiments, the first light emitting element 131 may be a micro light emitting diode for emitting blue light, the second light emitting element 132 may be a micro light emitting diode for emitting green light, and the third light emitting element 133 may be a micro light emitting diode for emitting blue light, but the present invention is not limited thereto.

[0061] Please refer to Figure 1 and Figure 2 Each pixel unit PX of the display device 10 further includes a first color conversion structure 141, which is disposed in the first opening 121 of the bank layer 120 and covers the first light-emitting element 131. For example, in some embodiments, the first color conversion structure 141 can convert the blue light emitted by the first light-emitting element 131 into red light, but the present invention is not limited thereto. Figure 1 and Figure 3 In some embodiments, each pixel unit PX of the display device 10 may further selectively include a second color conversion structure 142 disposed in the sixth opening 126 of the bank layer 120 and covering the spare pad set 112R-1. In some embodiments, the second color conversion structure 142 may convert blue light into red light, but the present invention is not limited thereto.

[0062] Please refer to Figure 1 and Figure 3 , each pixel unit PX of the display device 10 further includes a first scattering structure 151, which is disposed in the second opening 122 of the bank layer 120 and covers the second light-emitting element 132. In some embodiments, the first scattering structure 151 may include a transparent substrate and scattering particles mixed in the transparent substrate. The light beam emitted by the second light-emitting element 132 may be scattered by the first scattering structure 151, and the color of the light beam emitted by the second light-emitting element 132 is substantially not changed by the first scattering structure 151.

[0063] Please refer to Figure 1 and Figure 2In some embodiments, each pixel unit PX of the display device 10 further includes a first transparent structure 161 disposed in the fourth opening 124 of the bank layer 120. The first transparent structure 161 does not include scattering particles. In some embodiments, the first transparent structure 161 can be formed by curing the optical glue filled in the fourth opening 124.

[0064] Please refer to Figure 1 and Figure 2 , each pixel unit PX of the display device 10 further includes a second scattering structure 152, which is disposed in the third opening 123 of the bank layer 120 and covers the third light-emitting element 133. In some embodiments, the second scattering structure 152 may include a transparent substrate and scattering particles mixed in the transparent substrate. The light beam emitted by the third light-emitting element 133 may be scattered by the second scattering structure 152, and the color of the light beam emitted by the third light-emitting element 133 is substantially not changed by the second scattering structure 152.

[0065] Please refer to Figure 1 and Figure 3 In some embodiments, each pixel unit PX of the display device 10 further includes a second transparent structure 162 disposed in the fifth opening 125 of the bank layer 120. The second transparent structure 162 does not include scattering particles. In some embodiments, the second transparent structure 162 can be formed by curing the optical glue filled in the fifth opening 125.

[0066] Please refer to Figure 1 It is worth noting that the first color conversion structure 141 and the first scattering structure 151 respectively covering the first light emitting element 131 and the second light emitting element 132 are arranged in the first direction d1, and the first direction d1 is staggered with the column direction y and the row direction x. The first scattering structure 151 and the second scattering structure 152 respectively covering the second light emitting element 132 and the third light emitting element 133 are arranged in the second direction d2, and the second direction d2 is staggered with the column direction y and the row direction x, and the first direction d1 is staggered with the second direction d2. That is, in the same pixel unit PX, the first scattering structure 151 and the second scattering structure 152 respectively covering the second light emitting element 132 and the third light emitting element 133 are located in different rows and in different columns. Therefore, in the manufacturing process of the display device 10, when a scattering material layer (not shown) is patterned to form the first scattering structure 151 and the second scattering structure 152, the scattering material layer is not likely to remain between the first scattering structure 151 and the second scattering structure 152. As a result, the bank layer 120 formed subsequently is not likely to stand on the residual scattering material layer between the first scattering structure 151 and the second scattering structure 152 , thereby affecting the optical performance of the display device 10 .

[0067] Please refer to Figure 1 and Figure 2In some embodiments, the first transparent structure 161 can separate the first color conversion structure 141 and the second scattering structure 152. Figure 1 In some embodiments, the first transparent structure 161 and the second transparent structure 162 may be arranged in a first direction d1 that is not parallel to the row direction x and the column direction y.

[0068] Please refer to Figure 1 and Figure 3 In some embodiments, the first scattering structure 151 and the second transparent structure 162 are arranged in the row direction x, and the first scattering structure 151 is located between the second color conversion structure 142 and the second transparent structure 162 .

[0069] Please refer to Figure 1 In some embodiments, the main pad group 112M-1 and the backup pad group 112R-1 overlap the first color conversion structure 141 and the second color conversion structure 142 respectively. Figure 1 In some embodiments, the main pad group 112M-2 and the backup pad group 112R-2 overlap the first scattering structure 151 and the first transparent structure 161 respectively. Figure 1 In some embodiments, the main pad group 112M- 3 and the backup pad group 112R- 3 overlap the second scattering structure 152 and the second transparent structure 162 respectively.

[0070] It must be noted that the following embodiments use the component numbers and some contents of the previous embodiments, wherein the same number is used to represent the same or similar components, and the description of the same technical contents is omitted. The description of the omitted parts can refer to the previous embodiments, and the following embodiments will not be repeated.

[0071] Figure 5 FIG. 4 is a top view and perspective view of a display device according to another embodiment of the present invention. Figure 5 The display device 10A and Figure 1 The display device 10 is similar to the display device 10, and the difference between the two is that: Figure 5 In the embodiment of the present invention, the first color conversion structure 141 and the first scattering structure 151 respectively covering the first light emitting element 131 and the second light emitting element 132 are arranged in the first direction d1, and the first direction d1 is substantially from Figure 5 The lower left side points to Figure 5 The first scattering structure 151 and the second scattering structure 152 respectively covering the second light emitting element 132 and the third light emitting element 133 are arranged in the second direction d2, and the second direction d2 is composed of Figure 5 The upper left point Figure 5 .

[0072] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A display device, characterized in that: include: a driving circuit substrate; as well as A plurality of pixel units, wherein each of the pixel units comprises: A bank layer is disposed on the driving circuit substrate and has a plurality of openings, wherein the openings of the bank layer are arranged in a plurality of rows and columns along a row direction and a column direction, and the openings of the bank layer include a first opening, a second opening and a third opening; A first light-emitting element, a second light-emitting element and a third light-emitting element are disposed on the driving circuit substrate, electrically connected to the driving circuit substrate, and respectively located in the first opening, the second opening and the third opening of the bank layer; a first color conversion structure disposed in the first opening of the bank layer and covering the first light emitting element; a first scattering structure, disposed in the second opening of the bank layer and covering the second light emitting element; and a second scattering structure, disposed in the third opening of the bank layer and covering the third light emitting element; The first color conversion structure and the first scattering structure respectively covering the first light-emitting element and the second light-emitting element are arranged in a first direction, and the first direction is staggered with the column direction and the row direction. The first scattering structure and the second scattering structure respectively covering the second light-emitting element and the third light-emitting element are arranged in a second direction, and the second direction is staggered with the column direction and the row direction, and the first direction is staggered with the second direction.

2. The display device according to claim 1, wherein: The openings of the bank layer further include a fourth opening, the first opening, the fourth opening and the third opening of the bank layer are arranged in the row direction, and the fourth opening is located between the first opening and the third opening, and the display device further includes: a first transparent structure disposed in the fourth opening of the bank layer; The first transparent structure separates the first color conversion structure and the second scattering structure.

3. The display device according to claim 2, wherein: The openings of the bank layer further include a fifth opening, the third opening and the fifth opening of the bank layer are arranged in the row direction, and the display device further includes: a second transparent structure disposed in the fifth opening of the bank layer; The first transparent structure and the second transparent structure are arranged in the first direction.

4. The display device according to claim 3, characterized in that The openings of the bank layer further include a sixth opening, the first opening and the sixth opening of the bank layer are arranged in the row direction, and the sixth opening and the second opening of the bank layer are arranged in the column direction. The display device further includes: A second color conversion structure is disposed in the sixth opening of the bank layer.

5. The display device according to claim 4, characterized in that The second color conversion structure, the first scattering structure and the second transparent structure are arranged in the row direction, and the first scattering structure is located between the second color conversion structure and the second transparent structure.

6. The display device according to claim 3, characterized in that The driving circuit substrate has a main pad group and a spare pad group electrically connected to each other, the second light emitting element is connected to the main pad group, and the main pad group and the spare pad group overlap the first scattering structure and the first transparent structure respectively.

7. The display device according to claim 3, characterized in that: The driving circuit substrate has a main pad group and a spare pad group electrically connected to each other, the third light emitting element is connected to the main pad group, and the main pad group and the spare pad group overlap the second scattering structure and the second transparent structure respectively.

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