Display device

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 each other. The plurality of light-emitting elements are located on the first surface of the circuit substrate and are electrically connected to the circuit substrate, wherein a first light-emitting element among the plurality of light-emitting elements has a first spacing with the second surface, a second light-emitting element among the plurality of light-emitting elements has a second spacing with the second surface, and the first spacing is not equal to the second spacing.

Description

Technical Field

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

[0002] 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-LEDs, the current method for manufacturing micro-LED display devices is to use mass transfer technology, that is, to use micro-electromechanical array technology to carry out micro-LED die placement, so as to transfer a large number of micro-LED dies to the circuit substrate at one time. However, mass transfer technology often causes the dies to be misplaced, tilted or missed, resulting in abnormal color display of the display device and poor yield. Summary of the invention

[0003] The present invention provides a display device with improved yield.

[0004] One embodiment of the present invention provides a display device, comprising: a circuit substrate having a first surface and a second surface opposite to each other; and a plurality of light-emitting elements located on the first surface of the circuit substrate and electrically connected to the circuit substrate, wherein a first light-emitting element among the plurality of light-emitting elements has a first spacing with the second surface, a second light-emitting element among the plurality of light-emitting elements has a second spacing with the second surface, and the first spacing is not equal to the second spacing.

[0005] In one embodiment of the present invention, the first interval is greater than the second interval.

[0006] In one embodiment of the present invention, the first surface has a plurality of grooves.

[0007] In one embodiment of the present invention, the second light emitting element is located in the groove.

[0008] In one embodiment of the present invention, the electrode of the second light emitting element is located in the groove.

[0009] In one embodiment of the present invention, 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 a conductive adhesive.

[0010] In one embodiment of the present invention, the shape of the groove is square, circular, cross or triangle.

[0011] In one embodiment of the present invention, the display device further includes a positioning layer covering the first light emitting element.

[0012] In one embodiment of the present invention, 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.

[0013] In one embodiment of the present invention, the material of the positioning layer is propylene glycol monomethyl ether acetate, olefin resin, epoxy resin, naphthoquinone diazide ester, phenol compound, acid adduct of bisphenol fluorene epoxyacrylate or bisphenol A epichlorohydrin resin.

[0014] 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 among the plurality of light-emitting elements.

[0015] In one embodiment of the present invention, the positioning layer has an opening, and an orthographic projection of a second light emitting element among the plurality of light emitting elements on the circuit substrate is within an orthographic projection of the opening on the circuit substrate.

[0016] In one embodiment of the present invention, the second light emitting element is electrically connected to the circuit substrate via a conductive adhesive.

[0017] In order to make the above features and advantages of the present invention more obvious and easy to understand, embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1A FIG. 1 is a partial top view of a display device 10 according to an embodiment of the present invention.

[0019] Figure 1B is along Figure 1A A schematic cross-sectional view taken along the section line AA'.

[0020] Figure 1C is along Figure 1A A schematic cross-sectional view taken along section line BB'.

[0021] Figure 2A FIG. 2 is a partial top view of a display device 20 according to an embodiment of the present invention.

[0022] Figure 2B is along Figure 2A Schematic cross-sectional view taken along section line CC'.

[0023] Figure 3A FIG. 4 is a partial top view of a display device 30 according to an embodiment of the present invention.

[0024] Figure 3B is along Figure 3A A schematic cross-sectional diagram taken along section line D-D'.

[0025] Figure 4 FIG. 4 is a partial top view of a display device 40 according to an embodiment of the present invention.

[0026] Figure 5A FIG. 5 is a partial top view of a display device 50 according to an embodiment of the present invention.

[0027] Figure 5B is along Figure 5A Schematic cross-sectional view taken along section line EE'.

[0028] Description of reference numerals:

[0029] 10, 20, 30, 40, 50: Display device

[0030] A-A', B-B', C-C', D-D', E-E': hatching

[0031] 101, 201, 301, 501: First surface

[0032] 102, 202, 302, 502: Second surface

[0033] 110, 210, 310, 410, 510: Circuit board

[0034] 112, 212, 312, 512: Bottom plate

[0035] 114, 214, 216, 218, 314, 316, 318, 514: driving circuit layer

[0036] 120, 121, 122, 122A, 123: Light emitting element

[0037] 220, 221, 222, 222A, 223: Light emitting element

[0038] 320, 321, 322, 322A, 323: Light emitting elements

[0039] 420, 421, 422, 423: Light-emitting elements

[0040] 520, 521, 522, 522A, 523: Light emitting element

[0041] 530: Positioning layer

[0042] BP: Block

[0043] CM: Common Electrode

[0044] D11, D21, D31, D51: First spacing

[0045] D12, D22, D32, D52: Second spacing

[0046] E11, E21, E2A1, E2A2, E31: Electrodes

[0047] Ga, Gb, Gc, Gd1, Gd2, Gd3: Grooves

[0048] OP: Opening

[0049] PD, PD1, PD2, PD3, PD4, PD5, PD6, PD7: pads

[0050] PX, X1a, X1b, X2a, X2b: pixel unit

[0051] X3a, X3b, X5a, X5b: pixel unit

[0052] RU: Repeating Unit

[0053] S3, S5: Conductive materials

[0054] SL1, SL2, SL3: Signal line DETAILED DESCRIPTION

[0055] Figure 1A FIG. 1 is a partial top view of a display device 10 according to an embodiment of the present invention. Figure 1B is along Figure 1A A schematic cross-sectional view taken along the section line AA'. Figure 1C is along Figure 1A A schematic cross-sectional view taken along section line BB'.

[0056] Please also refer to Figures 1A to 1C The display device 10 includes: a circuit substrate 110 having a first surface 101 and a second surface 102 opposite to each other; and a plurality of light-emitting elements 120, which are located on the first surface 101 of the circuit substrate 110 and are electrically connected to the circuit substrate 110, wherein a first spacing D11 is provided between the light-emitting elements 121, 122, 123 of the plurality of light-emitting elements 120 and the second surface 102, a second spacing D12 is provided between the light-emitting element 122A of the plurality of light-emitting elements 120 and the second surface 102, and the first spacing D11 is not equal to the second spacing D12.

[0057] The following, with Figures 1A to 1C , the implementation of each component of the display device 10 is further described, but the present invention is not limited thereto.

[0058] In this embodiment, the circuit substrate 110 of the display device 10 may include a bottom plate 112 and a driving circuit layer 114 , wherein the driving circuit layer 114 may be located between the bottom plate 112 and the light emitting element 120 , and the light emitting element 120 may be electrically connected to the driving circuit layer 114 .

[0059] Specifically, the base plate 112 may be transparent or opaque, and its material may be glass, but is not limited thereto. In some embodiments, the base plate 112 may also be made of quartz, organic polymer, or opaque / reflective material (e.g., wafer, ceramic, etc.), or other applicable materials. Organic polymers such as polyimide (PI), polycarbonate (PC), polyester (PET), cyclic olefin copolymer (COC), metallocene-based cyclic olefin copolymer (mCOC) or other suitable materials, but are not limited thereto.

[0060] 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, etc. For example, in the present 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 in the driving circuit layer 114 and pads PD1, PD2, PD3, PD4, PD5, PD6, PD7 on the driving circuit layer 114, wherein the pads PD1 and PD4 may be electrically connected to the signal line SL1, the pads PD2 and PD5 may be electrically connected to the signal line SL2, the pads PD3 and PD6 may be electrically connected to the signal line SL3, and the pad PD7 may be electrically connected to other signal lines, such as a power line.

[0061] In the present embodiment, the light emitting element 120 may include light emitting elements 121, 122, and 123, and the light emitting elements 121, 122, and 123 may be located on the same side of the pad PD7, but the present invention is 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 may respectively constitute a sub-pixel of the display device 10, and the light emitting elements 121, 122, and 123 may together constitute a pixel unit X1a among a plurality of pixel units PX of the display device 10.

[0062] The light-emitting elements 121, 122, and 123 are, for example, manufactured on a growth substrate, and then transferred to the circuit substrate 110 through a mass transfer process, and are electrically connected to the signal lines SL1, SL2, and 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, the electrode E31 of the light-emitting element 123 can be electrically connected to the pad PD3 or the pad PD6, and the other electrodes of the light-emitting elements 121, 122, and 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, such as solder or conductive glue (such as silver glue), may be respectively 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, PD7.

[0063] 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 may also constitute a sub-pixel of the display device 10, and the light emitting elements 121, 122A, and 123 may together constitute a pixel unit X1b among the multiple pixel units PX of the display device 10.

[0064] 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 respectively arranged corresponding to the light-emitting elements 121, 122, and 123. When the light-emitting elements 121, 122, and 123 are misaligned, tilted, or missed during the transfer process, spare light-emitting elements of the light-emitting elements 121, 122, and 123 may be arranged again in the corresponding grooves Ga through a repair process to repair the sub-pixels that cannot operate normally. In other words, in the present embodiment, each groove Ga may serve as a spare area for repairing the light-emitting elements 121, 122, and 123, and the number of grooves Ga may be equal to the total number of the light-emitting elements 121, 122, and 123, but is not limited thereto.

[0065] For example, in the present embodiment, a plurality of grooves Ga may 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 may respectively fall into the orthographic projections of the grooves Ga on the circuit substrate 110. If the light-emitting element 122 in the pixel unit X1a cannot be lit due to misalignment, tilt or omission and needs to be repaired, the light-emitting element 122A may be arranged in the groove Ga adjacent to the light-emitting element 122 to form a pixel unit such as the pixel unit X1b. Since the light-emitting element 122A is arranged 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 may be greater than the second distance D12 between the electrode E2A1 of the light-emitting element 122A and the second surface 102.

[0066] In this embodiment, the light emitting element 122 that is misplaced, tilted, or missing in the pixel unit X1b during the mass transfer process can be removed, and the pad PD2 is left, but it is not limited thereto. In some embodiments, the pad PD2 can be further removed. In other embodiments, the misplaced or tilted light emitting element 122 and the pad PD2 can be retained without affecting the display effect of the display device 10.

[0067] Please refer to Figure 1C, the light emitting element 122A is, for example, manufactured on a growth substrate and then transferred to the groove Ga by laser transfer technology, and the electrode E2A1 of the light emitting element 122A can be electrically connected to the pad PD5, and the other electrode E2A2 of the light emitting element 122A 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 to prevent the electrode E2A1 and the electrode E2A2 of the light emitting element 122A from short-circuiting during the process of being electrically connected to the pads PD5 and PD7, respectively. 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 to avoid unnecessary electrical connections during the process of setting the spare light emitting elements of the light emitting elements 121 and 123 in the corresponding grooves Ga.

[0068] In the display device 10 of the present embodiment, the groove Ga can assist in the alignment during the process of disposing the light emitting element 122A, and helps to perform the light emitting element repair process more accurately and effectively, thereby improving the production yield of the display device 10 .

[0069] Below, use FIG. 2A to FIG. 5B Continue to describe other embodiments of the present invention, and continue to use Figures 1A to 1C The component numbers and related contents of the embodiments are the same or similar numbers are used to represent the same or similar components, and the description of the same technical contents is omitted. For the description of the omitted parts, please refer to Figures 1A to 1C The embodiments of the present invention will not be repeated in the following description.

[0070] Figure 2A FIG. 2 is a partial top view of a display device 20 according to an embodiment of the present invention. Figure 2B is along Figure 2A Please also refer to the cross-sectional diagram of the section line C-C'. FIG. 2A to FIG. 2B The display device 20 includes: a circuit substrate 210 having a first surface 201 and a second surface 202 opposite to each other; 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 a first spacing D21 is provided between the light-emitting elements 221, 222, 223 of the plurality of light-emitting elements 220 and the second surface 202, a second spacing D22 is provided between the light-emitting element 222A of the plurality of light-emitting elements 220 and the second surface 202, and the first spacing D21 is not equal to the second spacing D22. In addition, the display device 20 may include a plurality of pixel units PX, and the plurality of pixel units PX may include pixel units X2a and pixel units X2b.

[0071] With Figures 1A to 1C Compared with the display device 10 shown, FIG. 2A to FIG. 2BThe display device 20 shown is different in that the light emitting elements 221 , 222 , 223 of the display device 20 are located on different sides of the pad PD7 , and the circuit substrate 210 of the display device 20 has a plurality of pairs of circular grooves Gb.

[0072] For example, in this embodiment, the light emitting elements 221 and 223 of the display device 20 can be located on the upper side of the pad PD7, and the light emitting element 222 can be located on the lower side of the pad PD7, but the present invention is not limited thereto. In this way, the light output field type and viewing angle of the light emitting elements 221, 222, and 223 can be further adjusted.

[0073] In the present embodiment, the circuit substrate 210 of the display device 20 may include a bottom plate 212 and driving circuit layers 214, 216, and 218, wherein the driving circuit layers 214, 216, and 218 may be located between the bottom plate 212 and the light emitting element 220, and the light emitting element 220 may be electrically connected to the driving circuit layers 214, 216, and 218. Specifically, the signal lines SL1, SL2, and SL3 may be disposed in the driving circuit layers 214, 216, and 218, the pads PD1, PD3, and PD5 may be disposed on the driving circuit layer 218, and the pads PD2, PD4, and PD6 may be disposed in the driving circuit layer 216 on the driving circuit layer 214. The driving circuit layer 218 may have a plurality of pairs of corresponding grooves Gb, and the orthographic projection of one of the pairs of grooves Gb on the circuit substrate 210 may overlap the orthographic projection of the pad PD2, the pad PD4 or the pad PD6 on the circuit substrate 210, so that a portion of the pads PD2, PD4, PD6 may be exposed by the grooves Gb. In addition, the orthographic projection of the other of the pairs of grooves Gb on the circuit substrate 210 may overlap different regions of the pad PD7. In this way, each pair of grooves Gb may be electrically connected to different electrodes of the repaired light-emitting element, and can serve as a spare area for repairing the light-emitting element 221, 222 or 223.

[0074] For example, in the present embodiment, if the light emitting element 222 in the pixel unit X2a cannot be lit due to misalignment, tilt or omission and needs to be repaired, the light emitting element 222A can be set in a pair of grooves Gb corresponding to the light emitting element 222 to form a pixel unit such as the 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 first distance D21 between the electrode E11 of the light emitting element 221 or the electrode E31 of the light emitting element 223 and the second surface 202 can 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 the present embodiment, the groove Gb can serve as an alignment mark during 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.

[0075] Figure 3A FIG. 4 is a partial top view of a display device 30 according to an embodiment of the present invention. Figure 3B is along Figure 3A Please also refer to the cross-sectional diagram of the section line D-D'. FIG. 3A to FIG. 3B The display device 30 includes: a circuit substrate 310 having a first surface 301 and a second surface 302 opposite to each other; 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 a first spacing D31 is provided between the light-emitting elements 321, 322, 323 of the plurality of light-emitting elements 320 and the second surface 302, a second spacing D32 is provided between the light-emitting element 322A of the plurality of light-emitting elements 320 and the second surface 302, and the first spacing D31 is not equal to the second spacing D32. In addition, the display device 30 may include a plurality of pixel units PX, and the plurality of pixel units PX may include pixel units X3a and pixel units X3b.

[0076] 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, and 318, wherein the driving circuit layers 314, 316, and 318 may be located between the base plate 312 and the light-emitting element 320, and the light-emitting element 320 may be electrically connected to the driving circuit layers 314, 316, and 318.

[0077] With FIG. 2A to FIG. 2B Compared with the display device 20 shown, FIG. 3A to FIG. 3B The display device 30 shown is different in that the pairs of grooves Gc of the display device 30 have a cross shape.

[0078] Specifically, in the present embodiment, the signal lines SL1, SL2, and SL3 may be disposed in the driving circuit layers 314, 316, and 318, the pads PD1, PD3, and PD5 may be disposed on the driving circuit layer 318, and the pads PD2, PD4, and PD6 may be disposed in the driving circuit layer 316 on the driving circuit layer 314. The driving circuit layer 318 may have a plurality of pairs of cross-shaped grooves Gc, and the orthographic projection of one of each pair of grooves Gc on the circuit substrate 310 may overlap the pad PD2, the pad PD4, or the pad PD6, so that a portion of the pads PD2, PD4, and PD6 may be exposed by the grooves Gc. In addition, the orthographic projection of the other of each pair of grooves Gc on the circuit substrate 310 may overlap different regions of the pad PD7. In this way, each pair of grooves Gc may be electrically connected to different electrodes of the repaired light-emitting element, and may serve as a spare area for repairing the light-emitting element 321, 322, or 323.

[0079] In the present embodiment, if the light-emitting element 322 in the pixel unit X3a cannot be illuminated due to misalignment, tilt or omission and needs to be repaired, the light-emitting element 322A can be set in a pair of grooves Gc corresponding to the light-emitting element 322 to form a pixel unit such as the pixel unit X3b, 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 be electrically connected to the pad PD2 of the circuit substrate 310 through the conductive material S3 (such as conductive glue) in the groove Gc, 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 the present embodiment, the groove Gc can serve as an alignment mark during the process of setting the light emitting element 322A, and helps to repair the light emitting element more accurately and effectively, thereby improving the production yield of the display device 30 .

[0080] Figure 4 FIG. 4 is a partial top view of a display device 40 according to an embodiment of the present invention. FIG. 2A to FIG. 2B Compared with the display device 20 shown, Figure 4 The difference of the display device 40 shown is 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 arranged in parallel and a plurality of pads PD, the plurality of light-emitting elements 420 may include light-emitting elements 421, 422, 423, and one electrode of each of the light-emitting elements 421, 422, 423 may be electrically connected to the pad PD, and the other electrode of each of the light-emitting elements 421, 422, 423 may be electrically connected to the common electrode CM.

[0081] In addition, multiple pairs of triangular grooves Gd1, multiple pairs of circular grooves Gd2, and multiple pairs of cross grooves Gd3 can be formed on the surface of the circuit substrate 410 where the light-emitting elements 421, 422, and 423 are not provided, and the orthographic projection of one of each pair of grooves 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 different areas of the common electrode CM. In this way, each pair of grooves Gd1, Gd2, and 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.

[0082] 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, the number of light-emitting elements 421, 422, 423 included in each repeating unit RU and the number of logarithms of the grooves Gd1, Gd2, Gd3 (that is, the number of spare areas) may be the same or different.

[0083] For example, in the present 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 third light emitting elements 421, the first to third light emitting elements 422, and the first to third light emitting elements 423 are arranged in a fixed order in the upper row of the repeating unit RU, the fourth light emitting element 421, the fourth light emitting element 422, and the fourth light emitting element 423 are arranged in a fixed interval in the lower row of the repeating unit RU, and the two groups of grooves Gd1, Gd2, and Gd3 are respectively arranged between two adjacent ones of the fourth light emitting element 421, the fourth light emitting element 422, and the fourth light emitting element 423. That is, the repeating unit RU may include 12 light emitting elements and 6 pairs of grooves (6 spare areas), and the number of spare areas in the repeating unit RU may be less than the number of light emitting elements, so that too many redundant spare areas can be avoided, thereby improving the utilization of the grooves Gd1, Gd2, and Gd3.

[0084] Figure 5A FIG. 5 is a partial top view of a display device 50 according to an embodiment of the present invention. Figure 5B is along Figure 5A Please also refer to the cross-sectional diagram of the section line E-E'. FIG. 5A to FIG. 5B The display device 50 includes: a circuit substrate 510 having a first surface 501 and a second surface 502 opposite to each other; a plurality of light-emitting elements 520 located on the first surface 501 of the circuit substrate 510 and electrically connected to the circuit substrate 510; and a positioning layer 530 covering the light-emitting elements 521, 522, and 523 of the plurality of light-emitting elements 520.

[0085] 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 .

[0086] The driving circuit layer 514 may include elements or circuits required by the display device 50. For example, in the present 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 in the driving circuit layer 514 and pads PD1, PD2, PD3, PD7 on the driving circuit layer 114, wherein the pad PD1 may be electrically connected to the signal line SL1, the pad PD2 may be electrically connected to the signal line SL2, the pad PD3 may be electrically connected to the signal line SL3, and the pad PD7 may be electrically connected to other signal lines, such as a power line. In the present embodiment, the pads PD1, PD2, PD3 may be located on the same side of the pad PD7, but are not limited thereto.

[0087] In the present embodiment, the light emitting element 521 in 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 a pixel unit X5a in a 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, the electrode E21 of the light emitting element 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, and 523 can all be electrically connected to the pad PD7.

[0088] 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. Thus, the light emitting elements 521, 522A, and 523 may together constitute a pixel unit X5b among the plurality of pixel units PX of the display device 50.

[0089] In this embodiment, the positioning layer 530 may have at least one opening OP. When, during the process of transferring the light-emitting elements 521, 522, 523, for example, a certain light-emitting element 522 is misaligned, tilted, or omitted and the transfer fails, the positioning layer 530 may cover the successfully transferred light-emitting elements 521, 522, 523 and form an opening OP at the light-emitting element 522 where the transfer fails. The material of the positioning layer 530 may include an optical material, such as a photoresist, so that the positioning layer 530 may also help adjust the light extraction efficiency of the light-emitting elements 521, 522, 523. In some embodiments, the material of the positioning layer 530 can be propylene glycol monomethyl ether acetate, olefin resin, epoxy resin, naphthoquinone diazide ester, phenol compound, acid adduct of bisphenol fluorene epoxy acrylate, bisphenol A epichlorohydrin resin, or other suitable materials.

[0090] In the present embodiment, the light-emitting element 522 that has failed to be transferred can be removed before forming the positioning layer 530, during forming the opening OP, or after forming the opening OP. Afterwards, a spare light-emitting element 522A of the light-emitting element 522 can be set in the corresponding opening OP through a 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, thereby forming a pixel unit such as the pixel unit X1b. In other words, in the display device 50 of the present embodiment, the light-emitting element 522 that has failed to be transferred can be repaired in situ without reserving a spare area for repair. In some embodiments, the opening OP of the positioning layer 530 may not overlap the light-emitting elements 521, 522, 523, that is, the light-emitting element 522A can be repaired ex situ.

[0091] 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 (e.g., conductive glue), so that the second distance D52 between the electrode E2A1 of the light-emitting element 522A and the second surface 502 can 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.

[0092] In this embodiment, the pad PD2 electrically connected to the light emitting element 522 that failed to transfer can be left, but the present invention 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 signal line SL2 of the circuit substrate 510 through the conductive material S5.

[0093] In the display device 50 of the present embodiment, the opening OP can assist in alignment during the process of repairing the light emitting element 522A, and helps to repair the light emitting element more accurately and effectively, thereby improving the production yield of the display device 50 .

[0094] In summary, the display device of the present invention assists in the alignment or positioning of the light-emitting element during the repair process by setting a groove on the circuit substrate or setting an opening in the positioning layer, so that the light-emitting element can be repaired more accurately and effectively, thereby improving the production yield of the display device.

[0095] Although the present invention has been disclosed as above by way of embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some changes and modifications without departing from the concept and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the claims.

Claims

1. A display device, comprising: A circuit substrate having a first surface and a second surface opposite to each other; as well as A plurality of light emitting elements are located on the first surface of the circuit substrate and are electrically connected to the circuit substrate. There is a first distance between a first light-emitting element among the plurality of light-emitting elements and the second surface, there is a second distance between a second light-emitting element among 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, wherein the first surface has a plurality of grooves, The second light emitting element is located in the groove. The display device as claimed in claim 1 , wherein the first interval is greater than the second interval. The display device as claimed in claim 1 , wherein an electrode of the second light emitting element is located in the groove. 4 . The display device as claimed in claim 1 , wherein an 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 a conductive adhesive. The display device according to claim 1 , wherein the groove is in a shape of 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. 7 . The display device as claimed in claim 6 , wherein the positioning layer has an opening, and an orthographic projection of the second light emitting element on the circuit substrate is within an orthographic projection of the opening on the circuit substrate.

8. The display device according to claim 6, wherein the material of the positioning layer is propylene glycol monomethyl ether acetate, olefin resin, epoxy resin, naphthoquinone diazide ester, phenol compound, acid addition product of bisphenol fluorene epoxy acrylate or bisphenol A epichlorohydrin resin.

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