TWI798938B - Display device - Google Patents

Abstract

A display device includes a circuit substrate and a plurality of light-emitting elements. The circuit substrate has a first surface and a second surface opposite to the first surface. The plurality of light-emitting elements is disposed on the first surface of the circuit substrate and electrically connected to the circuit substrate, wherein the plurality of light-emitting elements includes a first light-emitting element and a second light-emitting element, and a first spacing between the first light-emitting element and the second surface is not equal to a second spacing between the second light-emitting element and the second surface.

Description

display device

The invention relates to a display device.

Micro-LED display devices have the advantages of power saving, high efficiency, high brightness and fast response time. Due to the extremely small size of micro light emitting diodes, the current method of manufacturing micro light emitting diode display devices is to use mass transfer (Mass Transfer) technology, that is, to use micro electromechanical array technology to pick and place micro light emitting diode crystals. To transport a large number of miniature light-emitting diode crystal grains onto the circuit substrate at one time. However, in mass transfer technology, crystal grains are often misplaced, tilted or missed, resulting in abnormal color rendering and poor yield of display devices.

The present invention provides a display device with improved yield.

One embodiment of the present invention proposes a display device, comprising: a circuit substrate having opposite first and second surfaces; and a plurality of light emitting elements located on the first surface of the circuit substrate and electrically connected to the circuit substrate, wherein , there is a first distance between the first light-emitting element of the plurality of light-emitting elements and the second surface, there is a second distance between the second light-emitting element of the plurality of light-emitting elements and the second surface, and the first distance is not equal to the first distance Two spacing.

In an embodiment of the present invention, the above-mentioned first distance is greater than the second distance.

In an embodiment of the present invention, the above-mentioned first surface has a plurality of grooves.

In an embodiment of the present invention, the above-mentioned second light-emitting element is located in the groove.

In an embodiment of the present invention, the electrode of the above-mentioned second light emitting element is located in the groove.

In an embodiment of the present invention, the electrodes of the above-mentioned second light-emitting element are located outside the groove, and the electrodes of the second light-emitting element are electrically connected to the circuit substrate through conductive glue.

In an embodiment of the present invention, the shape of the above-mentioned groove is square, circular, cross or triangular.

In an embodiment of the present invention, the above display device further includes a positioning layer covering the first light emitting element.

In an embodiment of the present invention, the above positioning layer has an opening, and the orthographic projection of the second light-emitting element on the circuit substrate is within the orthographic projection of the opening on the circuit substrate.

In one embodiment of the present invention, the above positioning layer is made of propylene glycol monomethyl ether acetate, olefin resin, epoxy resin, naphthoquinone diazide Naphthoquinone diazide ester, Phenol Compound, Acid adduct of bisphenol fluorene epoxy acrylate or Bisphenol A epichlorohydrin resin .

Another embodiment of the present invention provides a display device, including: a circuit substrate; a plurality of light emitting elements located on the circuit substrate and electrically connected to the circuit substrate; and a positioning layer covering a first light emitting element of the plurality of light emitting elements.

In an embodiment of the present invention, the positioning layer has an opening, and the orthographic projection of the second light-emitting element in the plurality of light-emitting elements on the circuit substrate is within the orthographic projection of the opening on the circuit substrate.

In an embodiment of the present invention, the above-mentioned second light-emitting element is electrically connected to the circuit substrate through conductive glue.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail together with the accompanying drawings.

FIG. 1A is a schematic partial top view of a display device 10 according to an embodiment of the invention. Fig. 1B is a schematic cross-sectional view taken along the section line A-A' of Fig. 1A. Fig. 1C is a schematic cross-sectional view taken along the section line B-B' of Fig. 1A.

1A to 1C, the display device 10 includes: a circuit substrate 110 having an opposite first surface 101 and a second surface 102; and a plurality of light emitting elements 120 located on the first surface 101 of the circuit substrate 110, and Electrically connect the circuit substrate 110, wherein there is a first distance D11 between the light emitting elements 121, 122, 123 in the plurality of light emitting elements 120 and the second surface 102, and the light emitting element 122A in the plurality of light emitting elements 120 is connected to the second surface There is a second distance D12 between 102, and the first distance D11 is not equal to the second distance D12.

Hereinafter, with reference to FIG. 1A to FIG. 1C , the implementation of each element of the display device 10 will be continuously described, but the present invention is not limited thereto.

In this embodiment, the circuit substrate 110 of the display device 10 may include a base plate 112 and a driving circuit layer 114, wherein the driving circuit layer 114 may be located between the base plate 112 and the light emitting element 120, and the light emitting element 120 may be electrically connected to the driving circuit layer 114.

In detail, the bottom plate 112 can be transparent or opaque, and its material can be glass, but not limited thereto. In some embodiments, the material of the bottom plate 112 can also be quartz, organic polymer, or opaque/reflective material (eg: wafer, ceramic, etc.), or other applicable materials. Organic polymers such as polyimide (polyimide, PI), polycarbonate (polycarbonate, PC), polyester (polyester, PET), cyclic olefin copolymer (cyclic olefin copolymer, COC), metal chromium compound substrate - Cyclic olefin copolymer (metallocene-based cyclic olefin copolymer, mCOC) or other suitable materials, but not limited thereto.

The driving circuit layer 114 may include elements or circuits required by the display device 10 , such as driving elements, switching elements, storage capacitors, power lines, driving signal lines, timing signal lines, current compensation lines, detection signal lines, and so on. For example, in this embodiment, the display device 10 may include a plurality of pixel units PX, and each pixel unit PX may include signal lines SL1, SL2, SL3 located in the driving circuit layer 114 and signal lines SL1, SL2, SL3 located in the driving circuit layer The pads PD1, PD2, PD3, PD4, PD5, PD6, and PD7 on 114, wherein the pads PD1, PD4 can be electrically connected to the signal line SL1, the pads PD2, PD5 can be electrically connected to the signal line SL2, and the pads PD3, The PD6 can be electrically connected to the signal line SL3, and the pad PD7 can be electrically connected to other signal lines, such as power lines.

In this embodiment, the light emitting element 120 may include light emitting elements 121 , 122 , 123 , and the light emitting elements 121 , 122 , 123 may be located on the same side of the pad PD7 , but not limited thereto. The light emitting element 121 is, for example, a red light emitting diode, the light emitting element 122 is, for example, a blue light emitting diode, and the light emitting element 123 is, for example, a green light emitting diode. In this way, the light-emitting elements 121, 122, and 123 can respectively constitute a sub-pixel of the display device 10, and the light-emitting elements 121, 122, and 123 can together constitute the pixel unit X1a among the plurality of pixel units PX of the display device 10. .

The light emitting elements 121 , 122 , 123 are, for example, fabricated on a growth substrate, then transferred to the circuit substrate 110 through a mass transfer process, and electrically connected to the signal lines SL1 , SL2 , SL3 respectively. For example, the signal line SL1 can be electrically connected to the pad PD1 and the pad PD4, the signal line SL2 can be electrically connected to the pad PD2 and the pad PD5, and the signal line SL3 can be electrically connected to the pad PD3 and the pad PD6. The electrode E11 of the light-emitting element 121 can be electrically connected to the pad PD1 or the pad PD4, the electrode E21 of the light-emitting element 122 can be electrically connected to the pad PD2 or the pad PD5, and the electrode E31 of the light-emitting element 123 can be electrically connected to the pad. The pad PD3 or the pad PD6, and the other electrodes of the light emitting elements 121, 122, 123 can all be electrically connected to the pad PD7. In this embodiment, the electrode E11 of the light emitting element 121 is electrically connected to the pad PD1, the electrode E21 of the light emitting element 122 is electrically connected to the pad PD2, and the electrode E31 of the light emitting element 123 is electrically connected to the pad PD3. In some embodiments, other conductive materials may be included between the electrodes E11, E21, E31 and other electrodes of the light emitting elements 121, 122, 123 and the pads PD1, PD2, PD3, PD4, PD5, PD6, and PD7, for example Solder or conductive glue (such as silver glue).

In this embodiment, the light emitting element 120 may further include a light emitting element 122A, and the light emitting element 122A may have the same light color as the light emitting element 122 . In this way, the light-emitting element 122A can also constitute a sub-pixel of the display device 10 , and the light-emitting elements 121 , 122A, and 123 can together constitute the pixel unit X1b among the plurality of pixel units PX of the display device 10 .

The first surface 101 of the circuit substrate 110 may be formed with a plurality of grooves Ga, and the plurality of grooves Ga may be disposed corresponding to the light emitting elements 121 , 122 , 123 respectively. When misalignment, inclination or omission occurs during the process of transferring the light-emitting elements 121, 122, 123, the spare light-emitting elements of the light-emitting elements 121, 122, 123 can be placed in the corresponding grooves Ga again through the repair process, so as to repair the ineffective A functioning subpixel. In other words, in this embodiment, each groove Ga can serve as a spare area for repairing the light-emitting elements 121, 122, 123, and the number of grooves Ga can be equal to the total number of light-emitting elements 121, 122, 123, but not by This is the limit.

For example, in this embodiment, a plurality of grooves Ga can be respectively arranged corresponding to or adjacent to the light-emitting elements 121, 122, 123, and the orthographic projections of the pads PD4, PD5, PD6 on the circuit substrate 110 can respectively fall into each groove. The groove Ga is in the orthographic projection of the circuit substrate 110 . If the light-emitting element 122 in the pixel unit X1a cannot be lighted due to dislocation, inclination or omission and needs to be repaired, the light-emitting element 122A can be arranged in the groove Ga adjacent to the light-emitting element 122 to form a picture of the pixel unit X1b. element unit. Since the light emitting element 122A is disposed in the groove Ga, the first distance D11 between the electrode E11 of the light emitting element 121, the electrode E21 of the light emitting element 122, or the electrode E31 of the light emitting element 123 and the second surface 102 can be larger than the electrode of the light emitting element 122A. A second distance D12 between E2A1 and the second surface 102 .

In this embodiment, the light-emitting elements 122 in the pixel unit X1b that are dislocated, tilted or missed during the mass transfer process can be removed, leaving the pad PD2, but not limited thereto. In some embodiments, the pad PD2 can be further removed. In other embodiments, under the premise of not affecting the display effect of the display device 10 , the misaligned or tilted light emitting elements 122 and the pads PD2 can be retained.

Please refer to FIG. 1C, the light-emitting element 122A is, for example, manufactured on a growth substrate, and then transferred to the groove Ga through laser transfer technology, and the electrode E2A1 of the light-emitting element 122A can be electrically connected to the pad PD5, and the light-emitting element 122A Another electrode E2A2 can be electrically connected to the pad PD7. In some embodiments, a block BP can also be provided in the groove Ga, and the block BP can be located between the pad PD5 and the pad PD7, so as to prevent the electrode E2A1 and the electrode E2A2 of the light emitting element 122A from being electrically connected to the A short circuit occurs in the process of pads PD5 and PD7. Similarly, the block BP can also be located between the pad PD4 and the pad PD7 and between the pad PD6 and the pad PD7, so as to avoid the process of arranging the spare light-emitting elements of the light-emitting elements 121 and 123 in the corresponding groove Ga Unnecessary electrical connections are created.

In the display device 10 of this embodiment, the groove Ga can assist alignment during the process of setting the light-emitting element 122A, and contribute to a more accurate and effective repair process of the light-emitting element, thereby improving the production yield of the display device 10 .

In the following, other embodiments of the present invention are continued to be described using FIGS. 2A to 5B , and the element numbers and related contents of the embodiment in FIGS. 1A to 1C are used, wherein the same or similar numbers are used to represent the same or similar elements , and the description of the same technical content is omitted. For the description of omitted parts, reference may be made to the embodiment shown in FIG. 1A to FIG. 1C , which will not be repeated in the following description.

FIG. 2A is a schematic partial top view of a display device 20 according to an embodiment of the invention. Fig. 2B is a schematic cross-sectional view taken along the section line C-C' of Fig. 2A. Please refer to FIG. 2A to FIG. 2B at the same time, the display device 20 includes: a circuit substrate 210 having opposite first surfaces 201 and second surfaces 202; and a plurality of light emitting elements 220 located on the first surface 201 of the circuit substrate 210, and Electrically connected to the circuit substrate 210, wherein there is a first distance D21 between the light-emitting elements 221, 222, 223 of the plurality of light-emitting elements 220 and the second surface 202, and the light-emitting element 222A of the plurality of light-emitting elements 220 is connected to the second surface There is a second distance D22 between 202, and the first distance D21 is not equal to the second distance D22. In addition, the display device 20 may include a plurality of pixel units PX, and the plurality of pixel units PX may include a pixel unit X2a and a pixel unit X2b.

Compared with the display device 10 shown in FIGS. 1A to 1C , the display device 20 shown in FIGS. 2A to 2B is different in that: the light emitting elements 221 , 222 , 223 of the display device 20 are located on different pads PD7. side, and the circuit substrate 210 of the display device 20 has multiple pairs of circular grooves Gb.

For example, in this embodiment, the light emitting elements 221 and 223 of the display device 20 may be located on the upper side of the pad PD7, and the light emitting element 222 may be located on the lower side of the pad PD7, but not limited thereto. In this way, the light output field type and viewing angle of the light emitting elements 221 , 222 , 223 can be further adjusted.

In this embodiment, the circuit substrate 210 of the display device 20 may include a base plate 212 and driving circuit layers 214, 216, 218, wherein the driving circuit layers 214, 216, 218 may be located between the base plate 212 and the light emitting element 220, and the light emitting element 220 can be electrically connected to the driving circuit layers 214 , 216 , 218 . Specifically, the signal lines SL1, SL2, SL3 can be arranged in the driving circuit layer 214, 216, 218, the pads PD1, PD3, PD5 can be arranged on the driving circuit layer 218, and the pads PD2, PD4, PD6 can be arranged In the driving circuit layer 216 on the driving circuit layer 214 . The driving circuit layer 218 may have multiple pairs of corresponding grooves Gb, and the orthographic projection of one of the grooves Gb on the circuit substrate 210 may overlap the pad PD2, the pad PD4 or the pad PD6 on the circuit substrate 210. Orthographic projection, so that a part of the pads PD2, PD4, PD6 can be exposed by the groove Gb. In addition, the orthographic projection of the other one of each pair of grooves Gb on the circuit substrate 210 may overlap a different area of the pad PD7. In this way, each pair of grooves Gb can be electrically connected to different electrodes of the repaired light-emitting device, and can serve as a spare area for repairing the light-emitting device 221 , 222 or 223 .

For example, in this embodiment, if the light emitting element 222 in the pixel unit X2a cannot be turned on due to dislocation, inclination or omission and needs to be repaired, light emitting elements can be set in a pair of grooves Gb corresponding to the light emitting element 222. element 222A to form a pixel unit such as pixel unit X2b, and the electrode E2A1 of the light emitting element 222A can be located in the groove Gb to be electrically connected to the pad PD2, so that the electrode E11 of the light emitting element 221 or the electrode of the light emitting element 223 The first distance D21 between the electrode E31 and the second surface 202 may be greater than the second distance D22 between the electrode E2A1 of the light emitting element 222A and the second surface 202 . In the display device 20 of this embodiment, the groove Gb can be used as an alignment mark in the process of setting the light-emitting element 222A, which helps to repair the light-emitting element more accurately and effectively, thereby improving the production yield of the display device 20 .

FIG. 3A is a schematic partial top view of a display device 30 according to an embodiment of the present invention. Fig. 3B is a schematic cross-sectional view taken along the section line D-D' of Fig. 3A. Please refer to FIG. 3A to FIG. 3B at the same time, the display device 30 includes: a circuit substrate 310 having opposite first surfaces 301 and second surfaces 302; and a plurality of light emitting elements 320 located on the first surface 301 of the circuit substrate 310, and Electrically connected to the circuit substrate 310, wherein there is a first distance D31 between the light emitting elements 321, 322, 323 of the plurality of light emitting elements 320 and the second surface 302, and the light emitting element 322A of the plurality of light emitting elements 320 is connected to the second surface There is a second distance D32 between 302, and the first distance D31 is not equal to the second distance D32. In addition, the display device 30 may include a plurality of pixel units PX, and the plurality of pixel units PX may include a pixel unit X3a and a pixel unit X3b.

In addition, in this embodiment, the circuit substrate 310 of the display device 30 may include a base plate 312 and driving circuit layers 314, 316, 318, wherein the driving circuit layers 314, 316, 318 may be located between the base plate 312 and the light emitting element 320, and The light emitting element 320 can be electrically connected to the driving circuit layers 314 , 316 , 318 .

Compared with the display device 20 shown in FIGS. 2A-2B , the display device 30 shown in FIGS. 3A-3B is different in that the pairs of grooves Gc of the display device 30 have a cross shape.

Specifically, in this embodiment, the signal lines SL1, SL2, and SL3 can be disposed in the driving circuit layers 314, 316, and 318, the pads PD1, PD3, and PD5 can be disposed on the driving circuit layer 318, and the pads PD2 , PD4 and PD6 can be disposed in the driving circuit layer 316 on the driving circuit layer 314 . The driving circuit layer 318 can have multiple pairs of cross-shaped grooves Gc, and the orthographic projection of one of the grooves Gc on the circuit substrate 310 can overlap the pads PD2, PD4 or PD6, so that the pads PD2, Parts of PD4 and PD6 may be exposed by the groove Gc. In addition, the orthographic projection of the other one of each pair of grooves Gc on the circuit substrate 310 may overlap a different area of the pad PD7. In this way, each pair of grooves Gc can be electrically connected to different electrodes of the repaired light-emitting device, and can serve as a spare area for repairing the light-emitting device 321 , 322 or 323 .

In this embodiment, if the light-emitting element 322 in the pixel unit X3a cannot be lighted due to dislocation, inclination or omission and needs to be repaired, the light-emitting element 322A can be arranged in a pair of grooves Gc corresponding to the light-emitting element 322, and A pixel unit such as the pixel unit X3b is formed, and the electrode E2A1 of the light-emitting element 322A can be located outside the groove Gc. For example, the lateral width of the electrode E2A1 can be greater than the lateral width of the groove Gc, but the electrode E2A1 can pass the groove Gc The conductive material S3 (such as conductive glue) in the circuit board 310 is electrically connected to the pad PD2 of the circuit substrate 310, so that the first distance D31 between the electrode E11 of the light emitting element 321 or the electrode E31 of the light emitting element 323 and the second surface 302 can be greater than the second distance D32 between the electrode E2A1 of the light emitting element 322A and the second surface 302 . In the display device 30 of this embodiment, the groove Gc can be used as an alignment mark in the process of setting the light-emitting element 322A, which helps to repair the light-emitting element more accurately and effectively, thereby improving the production yield of the display device 30 .

FIG. 4 is a schematic partial top view of a display device 40 according to an embodiment of the invention. Compared with the display device 20 shown in FIGS. 2A to 2B , the display device 40 shown in FIG. 4 is different in that: the display device 40 may include a circuit substrate 410 and a plurality of light emitting elements 420 located on the circuit substrate 410 , wherein the circuit substrate 410 may include a plurality of common electrodes CM and a plurality of pads arranged in parallel, the plurality of light emitting elements 420 may include light emitting elements 421, 422, 423, and one electrode of each light emitting element 421, 422, 423 The pads PD can be electrically connected, and the other electrode of each light emitting element 421 , 422 , 423 can be electrically connected to the common electrode CM.

In addition, multiple pairs of triangular grooves Gd1, multiple pairs of circular grooves Gd2, and multiple pairs of cross-shaped grooves Gd3 may be formed on the surface of the circuit substrate 410 where no light-emitting elements 421, 422, and 423 are provided, and each pair of grooves The orthographic projection of one of Gd1, Gd2, and Gd3 on the circuit substrate 410 can overlap the pad PD, and the orthographic projection of the other of each pair of grooves Gd1, Gd2, and Gd3 on the circuit substrate 410 can overlap the difference of the common electrode CM. area. In this way, each pair of grooves Gd1 , Gd2 , Gd3 can be electrically connected to different electrodes of a repaired light-emitting element, and can serve as a spare area for repairing the light-emitting element 421 , 422 or 423 .

In this embodiment, the display device 40 may include a plurality of repeating units RU, and depending on the arrangement of the light emitting elements 421, 422, 423 and the grooves Gd1, Gd2, Gd3 on the circuit substrate 410, each repeating unit RU The number of light emitting elements 421 , 422 , 423 included may be the same as or different from the logarithm of the grooves Gd1 , Gd2 , Gd3 (that is, the number of spare areas).

For example, in this embodiment, the repeating unit RU may include four light emitting elements 421, four light emitting elements 422, four light emitting elements 423, two pairs of grooves Gd1, two pairs of grooves Gd2, and two pairs of grooves Gd3 , wherein the first to three light-emitting elements 421, the first to three light-emitting elements 422 and the first to three light-emitting elements 423 are arranged in the upper column of the repeating unit RU in a fixed order, the fourth light-emitting element 421, the fourth The first light-emitting element 422 and the fourth light-emitting element 423 are arranged at a fixed distance below the repeating unit RU, and two sets of grooves Gd1, Gd2, and Gd3 are respectively arranged on the fourth light-emitting element 421, the fourth light-emitting element 422, and the fourth light-emitting element RU. between adjacent two of the four light emitting elements 423 . That is to say, the repeating unit RU can include 12 light-emitting elements and 6 pairs of grooves (6 spare areas), and the number of spare areas in the repeating unit RU can be smaller than the number of light-emitting elements. The rest of the spare area, thereby improving the utilization of the grooves Gd1, Gd2, and Gd3.

FIG. 5A is a schematic partial top view of a display device 50 according to an embodiment of the present invention. Fig. 5B is a schematic cross-sectional view taken along the section line E-E' of Fig. 5A. Please refer to FIG. 5A to FIG. 5B at the same time, the display device 50 includes: a circuit substrate 510 with opposite first surface 501 and second surface 502; a plurality of light emitting elements 520 located on the first surface 501 of the circuit substrate 510, and and a positioning layer 530 covering the light emitting elements 521, 522, 523 of the plurality of light emitting elements 520.

In this embodiment, the circuit substrate 510 of the display device 50 may include a bottom plate 512 and a driving circuit layer 514, wherein the driving circuit layer 514 may be located between the bottom plate 512 and the light emitting element 520, and the light emitting element 520 may be electrically connected to the driving circuit layer. 514.

The driving circuit layer 514 may include elements or circuits required by the display device 50 . For example, in this embodiment, the display device 50 may include a plurality of pixel units PX, and each pixel unit PX may include signal lines SL1, SL2, SL3 located in the driving circuit layer 514 and signal lines located in the driving circuit layer 514. The pads PD1, PD2, PD3, and PD7 on 114, wherein the pad PD1 can be electrically connected to the signal line SL1, the pad PD2 can be electrically connected to the signal line SL2, the pad PD3 can be electrically connected to the signal line SL3, and the pad PD7 can be electrically connected to other signal lines, such as power lines. In this embodiment, the pads PD1 , PD2 , and PD3 may be located on the same side of the pad PD7 , but not limited thereto.

In this embodiment, the light emitting element 521 of the light emitting element 520 is, for example, a red light emitting diode, the light emitting element 522 is, for example, a blue light emitting diode, and the light emitting element 523 is, for example, a green light emitting diode. In this way, the light-emitting elements 521, 522, and 523 can together constitute the pixel unit X5a among the plurality of pixel units PX of the display device 50, wherein the electrode E11 of the light-emitting element 521 can be electrically connected to the pad PD1, and the light-emitting element The electrode E21 of 522 can be electrically connected to the pad PD2, the electrode E31 of the light emitting element 523 can be electrically connected to the pad PD3, and the other electrodes of the light emitting elements 521, 522, 523 can all be electrically connected to the pad PD7.

In this embodiment, the light emitting element 520 may further include a light emitting element 522A, and the light emitting element 522A may have the same light color as the light emitting element 522 . In this way, the light emitting elements 521 , 522A, and 523 can together constitute the pixel unit X5 b among the plurality of pixel units PX of the display device 50 .

In this embodiment, the positioning layer 530 may have at least one opening OP. In the process of transferring light-emitting elements 521, 522, 523, for example, when a light-emitting element 522 is misplaced, tilted or missed and the transfer fails, the positioning layer 530 can cover the successfully transferred light-emitting elements 521, 522, 523, and transfer An opening OP is formed at the failed light emitting element 522 . The material of the positioning layer 530 may include optical materials, such as photoresist, so that the positioning layer 530 can also help to adjust the light extraction efficiency of the light emitting elements 521 , 522 , 523 . In some embodiments, the material of the alignment layer 530 can be propylene glycol monomethyl ether acetate, olefin resin (Olefin resin), epoxy resin (Epoxy resin), diazonaphthoquinone ester (Naphthoquinone diazide ester), phenol compound (Phenol Compound), bisphenol fluorene epoxy acrylate acid adduct (Acid adduct of bisphenol fluorene epoxy acrylate), bisphenol A epichlorohydrin resin (Bisphenol A epichlorohydrin resin) or other suitable s material.

In this embodiment, the light-emitting element 522 that fails to transfer can be removed before forming the positioning layer 530 , during forming the opening OP, or after forming the opening OP. Afterwards, the spare light-emitting element 522A of the light-emitting element 522 can be placed in the corresponding opening OP through the repair process, and the orthographic projection of the light-emitting element 522A on the circuit substrate 510 is within the orthographic projection of the opening OP on the circuit substrate 510, forming a picture-like Pixel unit of pixel unit X1b. In other words, in the display device 50 of this embodiment, the light-emitting element 522 that fails to transfer can be repaired in situ without reserving a spare area for repair. In some embodiments, the opening OP of the alignment layer 530 may not overlap the light emitting elements 521 , 522 , 523 , that is, the light emitting element 522A may be repaired in situ.

In this embodiment, the electrode E2A1 of the light emitting element 522A can be electrically connected to the pad PD2 of the circuit substrate 510 through a conductive material S5 (such as conductive glue), so that the electrode E2A1 of the light emitting element 522A and the second surface 502 The second distance D52 may be greater than the first distance D51 between the electrode E11 of the light emitting element 521 , the electrode E21 of the light emitting element 522 or the electrode E31 of the light emitting element 523 and the second surface 502 .

In this embodiment, the pad PD2 electrically connected to the light-emitting element 522 that failed to transfer can be left, but it is not limited thereto. For example, in some embodiments, the pad PD2 can be further removed during the process of removing the light-emitting element 522 that failed to transfer, and the electrode E2A1 of the light-emitting element 522A can be electrically connected to the circuit substrate 510 through the conductive material S5 The signal line SL2.

In the display device 50 of this embodiment, the opening OP can assist alignment during the process of repairing the light-emitting element 522A, thereby facilitating more accurate and effective repair of the light-emitting element, thereby improving the production yield of the display device 50 .

In summary, the display device of the present invention assists the alignment or positioning of the light-emitting elements during the repair process by providing grooves on the circuit substrate or openings in the positioning layer, so that the light-emitting elements can be more accurately and effectively Repair, thereby improving the production yield of the display device.

Although the present invention has been disclosed above with the embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field may make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention should be defined by the scope of the appended patent application.

10, 20, 30, 40, 50: display device A-A', B-B', C-C', D-D', E-E': hatching 101, 201, 301, 501: the first surface 102, 202, 302, 502: second surface 110, 210, 310, 410, 510: circuit board 112, 212, 312, 512: bottom plate 114, 214, 216, 218, 314, 316, 318, 514: driving circuit layer 120, 121, 122, 122A, 123: light emitting elements 220, 221, 222, 222A, 223: light emitting elements 320, 321, 322, 322A, 323: light emitting elements 420, 421, 422, 423: light emitting elements 520, 521, 522, 522A, 523: light emitting elements 530: positioning layer BP: Block CM: common electrode D11, D21, D31, D51: first spacing D12, D22, D32, D52: second spacing E11, E21, E2A1, E2A2, E31: electrodes Ga, Gb, Gc, Gd1, Gd2, Gd3: Groove OP: opening PD, PD1, PD2, PD3, PD4, PD5, PD6, PD7: Pads PX, X1a, X1b, X2a, X2b: pixel unit X3a, X3b, X5a, X5b: pixel unit RU: repeating unit S3, S5: conductive material SL1, SL2, SL3: signal lines

FIG. 1A is a schematic partial top view of a display device 10 according to an embodiment of the invention. Fig. 1B is a schematic cross-sectional view taken along the section line A-A' of Fig. 1A. Fig. 1C is a schematic cross-sectional view taken along the section line B-B' of Fig. 1A. FIG. 2A is a schematic partial top view of a display device 20 according to an embodiment of the invention. Fig. 2B is a schematic cross-sectional view taken along the section line C-C' of Fig. 2A. FIG. 3A is a schematic partial top view of a display device 30 according to an embodiment of the present invention. Fig. 3B is a schematic cross-sectional view taken along the section line D-D' of Fig. 3A. FIG. 4 is a schematic partial top view of a display device 40 according to an embodiment of the invention. FIG. 5A is a schematic partial top view of a display device 50 according to an embodiment of the present invention. Fig. 5B is a schematic cross-sectional view taken along the section line E-E' of Fig. 5A.

10: Display device

101: First Surface

102: second surface

110: circuit substrate

112: Bottom plate

114: Drive circuit layer

120, 121, 122, 122A, 123: light emitting elements

D11: First spacing

D12: Second spacing

E11, E21, E2A1, E31: electrodes

Ga: Groove

PD1, PD2, PD3, PD4, PD5, PD6: Pads

PX, X1a, X1b: pixel unit

SL1, SL2, SL3: signal lines

Claims (10)

A display device, comprising: a circuit substrate having opposite first and second surfaces; and a plurality of light emitting elements located on the first surface of the circuit substrate and electrically connected to the circuit substrate, wherein, There is a first distance between the first light-emitting element of the plurality of light-emitting elements and the second surface, and there is a second distance between the second light-emitting element of the plurality of light-emitting elements and the second surface, And the first distance is not equal to the second distance, and the first light-emitting element and the second light-emitting element have the same light color. The display device according to claim 1, wherein the first pitch is greater than the second pitch. The display device according to claim 1, wherein the first surface has a plurality of grooves. The display device according to claim 3, wherein the second light emitting element is located in the groove. The display device according to claim 3, wherein the electrode of the second light emitting element is located in the groove. The display device according to claim 3, wherein the electrode of the second light emitting element is located outside the groove, and the electrode of the second light emitting element is electrically connected to the circuit substrate through conductive glue. The display device according to claim 3, wherein the shape of the groove is a square, a circle, a cross or a triangle. The display device according to claim 1, further comprising a positioning layer covering the first light-emitting element. The display device according to claim 8, wherein the positioning layer has an opening, and the orthographic projection of the second light-emitting element on the circuit substrate is within the orthographic projection of the opening on the circuit substrate. The display device as claimed in item 8, wherein the material of the positioning layer is propylene glycol monomethyl ether acetate, olefin resin (Olefin resin), epoxy resin (Epoxy resin), diazo Naphthoquinone diazide ester, Phenol Compound, Acid adduct of bisphenol fluorene epoxy acrylate or Bisphenol A epichlorohydrin resin resin).

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