Light-emitting device and display device

Abstract

The invention discloses a light-emitting device and a display device. The light-emitting device comprises a transparent layer and a plurality of light-emitting elements. The transparent layer comprises a first surface and a second surface which are oppositely arranged. The light-emitting elements are arranged on the second surface of the transparent layer, and the first surface of the transparent layer forms a light-emitting surface of the light-emitting device. The light-emitting elements are sequentially arranged at intervals in the first extending direction. In the first extending direction, the light-emitting element located at the first position is the first light-emitting element, and the light-emitting element located at the last position is the last light-emitting element. The included angle between the side wall of the transparent layer and the connecting line from the side, closest to the edge of the light-emitting device, of the first light-emitting element or the last light-emitting element to the edge, corresponding to the closest side, of the light-emitting face of the transparent layer is theta, and theta is larger than or equal to 30 degrees. Therefore, the light emitting element close to the edge position can reach the maximum light emitting angle, and the problem of chromatic aberration caused by large-angle observation on the two sides due to insufficient light emitting is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of semiconductor devices, and in particular to a light-emitting device and a display device. Background Art

[0002] In recent years, new display technologies have been developing rapidly, such as OLED, Min / MicroLED and other technologies have received extensive research and attention. LED chips are widely used in display devices, vehicle lamps, general lighting and other fields due to their high reliability, long life and low power consumption. In addition, due to the advantage of low power consumption, LED has become the mainstream in the field of display technology.

[0003] At present, MIP (Mini / Micro LED in Package) packaging is a hot track in the display field. The MIP packaging technology is a technology that packages Mini / Micro LED chips at the chip level. The display screen is made by cutting them into single devices, splitting and mixing light, etc. The smaller the package size, the closer the single package is to a point light source, and the higher the pixel of the display device. However, small-sized MIP packages have color differences when observed at large angles, which affects the overall display effect. Summary of the invention

[0004] In view of the above shortcomings of the prior art, an object of the present invention is to provide a light emitting device and a display device to improve the color difference problem of the light emitting device when observed at a large angle.

[0005] In order to achieve the above-mentioned object and other related objects, the present invention provides a light emitting device, comprising:

[0006] The transparent layer comprises a first surface and a second surface which are arranged opposite to each other;

[0007] A plurality of light-emitting elements are arranged on the second surface of the transparent layer, and the first surface of the transparent layer forms a light-emitting surface of the light-emitting device; the plurality of light-emitting elements are sequentially arranged at intervals along the first extension direction; along the first extension direction, the light-emitting element at the first position is the first light-emitting element, and the light-emitting element at the last position is the last light-emitting element;

[0008] The angle between the line from the side of the first light emitting element or the last light emitting element closest to the edge of the light emitting device to the edge of the light emitting surface of the transparent layer corresponding to the closest side and the side wall of the transparent layer is θ, and θ is greater than or equal to 30°.

[0009] The light emitting device has a first extension direction and a second extension direction in the top projection direction, and the first extension direction and the second extension direction are perpendicular to each other. According to one aspect of the present invention, the present invention also provides a display device, the display device includes a display substrate and at least one light emitting device, at least one light emitting device is arranged on the display substrate, each light emitting device is electrically connected to the display substrate, and the light emitting device is the above-mentioned light emitting device.

[0010] Compared with the prior art, the light emitting device and the display device of the present invention have at least the following beneficial effects:

[0011] The light-emitting device of the present invention comprises a transparent layer and a plurality of light-emitting elements. The transparent layer comprises a first surface and a second surface arranged opposite to each other. The plurality of light-emitting elements are arranged on the second surface of the transparent layer, and the first surface of the transparent layer forms a light-emitting surface of the light-emitting device. The plurality of light-emitting elements are arranged in sequence and spaced along a first extension direction. Along the first extension direction, the light-emitting element at the first position is the first light-emitting element, and the light-emitting element at the last position is the last light-emitting element. The angle between the line connecting the side closest to the edge of the light-emitting device or the last light-emitting element to the edge of the light-emitting surface of the transparent layer corresponding to the closest side and the side wall of the transparent layer is θ, and θ is greater than or equal to 30°. Therefore, the present invention controls the angle between the light-emitting element at the edge of the light-emitting device, that is, the line connecting the edge of the first light-emitting element and the last light-emitting element to the edge of the light-emitting surface of the transparent layer and the side wall of the transparent layer, so as to achieve the maximum light-emitting angle for the light-emitting element close to the edge, thereby avoiding the problem of color difference caused by insufficient light emission when observing at a large angle on both sides of the edge of the light-emitting device.

[0012] The display device of the present invention includes the above-mentioned light-emitting device, and the light-emitting device in the display device can ensure that the light-emitting elements located at its edge position achieve the maximum light output angle, avoid the problem of color difference when observing at a large angle on both sides due to insufficient light output, and ensure the display effect of the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1a It is a schematic diagram of the top view structure of the light emitting surface of the existing light emitting device;

[0014] Figure 1b is a schematic diagram of the top view of the light emitting surface of the light emitting device in an embodiment of the present invention;

[0015] Figure 2 For along Figure 1b A partial cross-sectional view taken along the AA' axis to the light-emitting element and the filling layer;

[0016] Figure 3 A photo of the light emitting condition of the light emitting surface of the existing light emitting device;

[0017] Figure 4 A schematic diagram of a top view of a non-light emitting surface of a light emitting device in an example of an embodiment of the present invention;

[0018] Figure 5 For along Figure 4 Sectional view taken along the B-B' direction;

[0019] Figure 6 is a schematic diagram of a top view of a non-light emitting surface of a light emitting device in another example of an embodiment of the present invention;

[0020] Figure 7 A schematic diagram of a top view of a non-light emitting surface of a light emitting device in another example of an embodiment of the present invention;

[0021] Figure 8 FIG. 1 is a schematic diagram of a top view of a non-light emitting surface of a light emitting device in another example of an embodiment of the present invention.

[0022] List of reference numerals:

[0023] 100 Transparent Layer

[0024] 101 First Surface

[0025] 1011 First Side

[0026] 1012 Second Side

[0027] 1013 The Third Side

[0028] 1014 The Fourth Side

[0029] 102 Second Surface

[0030] 110 First transparent layer

[0031] 120 Second transparent layer

[0032] 201 first light emitting element

[0033] 202 second light emitting element

[0034] 203 third light emitting element

[0035] 204 Driver Chip

[0036] 300 Filling Layers

[0037] 400 wiring layers

[0038] 401 First sublayer

[0039] 402 Second sublayer

[0040] 500 Insulation

[0041] 600 Pads

[0042] 601 First driving pad

[0043] 602 Second driving pad

[0044] 603 Third drive pad

[0045] 6041 First other pad

[0046] 6042 Second other pad

[0047] 6043 Third other pad

[0048] X First extension direction

[0049] Y Second extension direction DETAILED DESCRIPTION

[0050] The following specific embodiments illustrate the embodiments of the present invention, and those familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0051] It should be noted that the diagrams provided in the embodiments of the present invention are only used to illustrate the basic concept of the present invention in a schematic manner. Although the diagrams only show the components related to the present invention rather than being drawn according to the number, shape and size of the components in actual implementation, the form, quantity and proportion of each component can be changed at will during actual implementation, and the layout of the components may also be more complex. The structures, proportions, sizes, etc. illustrated in the drawings of the specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions that can be implemented in this application, so they have no technical substantive significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by the present invention.

[0052] The inventors have found that as the package size of the light-emitting device decreases, the small-sized light-emitting device will have color difference when viewed at a large angle, which affects the overall display effect. Figure 1a, the first light emitting element 201 is a blue light emitting element, the second light emitting element 202 is a green light emitting element, and the third light emitting element 203 is a red light emitting element. Due to the reduction in the package size of the light emitting device, when observing the inside of the light emitting device from the side of the blue light emitting element (the first light emitting element 201) arranged at the edge, both the red light emitting element and the green light emitting element can emit light within a certain light emitting angle range, but the blue light is missing in a certain light emitting angle range, and the display effect is reddish, such as Figure 3 Observing the interior of the light-emitting device from the side of the red light-emitting element (third light-emitting element 203) at the edge, the blue light-emitting element and the green light-emitting element can emit light within a certain light-emitting angle range, but the red light is missing in a certain light-emitting angle range, and the display effect is blue. Figure 3 shown.

[0053] In order to solve the background technology and the above-mentioned technical problems, the present embodiment provides a light-emitting device and a display device to solve the technical problem of color difference of the above-mentioned light-emitting device when observed at a large angle, thereby improving the light output yield of the device.

[0054] Specifically, this embodiment provides a light emitting device, including:

[0055] The transparent layer comprises a first surface and a second surface which are arranged opposite to each other;

[0056] A plurality of light-emitting elements are arranged on the second surface of the transparent layer, and the first surface of the transparent layer forms a light-emitting surface of the light-emitting device; the plurality of light-emitting elements are sequentially arranged at intervals along the first extension direction. Along the first extension direction, the light-emitting element at the first position is the first light-emitting element, and the light-emitting element at the last position is the last light-emitting element.

[0057] Among them, the angle between the line connecting the side of the first light-emitting element or the last light-emitting element closest to the edge of the light-emitting device to the edge of the light-emitting surface of the transparent layer corresponding to the closest side and the side wall of the transparent layer is θ, and θ is greater than or equal to 30°. The present invention controls the angle between the line connecting the edge of the light-emitting element located at the edge of the light-emitting device, that is, the edge of the first light-emitting element and the last light-emitting element to the edge of the light-emitting surface of the transparent layer and the side wall of the transparent layer, so as to achieve the maximum light-emitting angle of the light-emitting element close to the edge, thereby avoiding the problem of color difference caused by large-angle observation on both sides due to insufficient light emission.

[0058] Optionally, the refractive index of the transparent layer ranges from 1.3 to 2.5.

[0059] Optionally, the minimum distance from the edges of the multiple light-emitting elements to the edge of the light-emitting device in the second extension direction is greater than the minimum distance from the edge of the first light-emitting element or the last light-emitting element in the first extension direction to the edge of the light-emitting device, and the minimum distance from the edges of the multiple light-emitting elements to the edge of the light-emitting device in the second extension direction is greater than 15μm.

[0060] Optionally, the transparent layer has a thickness H, and in a direction parallel to the first extension direction, a minimum distance between an edge of a first light emitting element or a last light emitting element and an edge of the second surface of the transparent layer is E, wherein:

[0061]

[0062] Optionally, H ranges from 40 μm to 150 μm, and E ranges from 40 μm to 100 μm.

[0063] Optionally, the transparent layer is sapphire, with H≤80 μm.

[0064] Optionally, the transparent layer is optical glass, with H≤60 μm.

[0065] Optionally, Among them, n1 is the refractive index of the transparent layer, and n2 is the refractive index of air.

[0066] Optionally, the transparent layer comprises:

[0067] First transparent layer;

[0068] The second transparent layer is arranged on the first transparent layer, a plurality of light emitting elements are arranged on the second transparent layer at intervals, and a side of the first transparent layer facing away from the second transparent layer is formed as a light emitting surface.

[0069] Optionally, the second transparent layer is an adhesive layer, and the first transparent layer is sapphire or optical glass.

[0070] Optionally, the light emitting device further comprises:

[0071] A filling layer, arranged between adjacent light-emitting elements and around the periphery of the plurality of light-emitting elements;

[0072] A wiring layer, disposed above the light-emitting elements and the filling layer, and electrically connected to each light-emitting element;

[0073] An insulating layer covers the wiring layer, and a plurality of openings are arranged on the insulating layer, each opening exposing a portion of the wiring layer;

[0074] The plurality of light-emitting elements include a first light-emitting element, a second light-emitting element and a third light-emitting element. The first light-emitting element is a light-emitting element radiating blue light, the second light-emitting element is a light-emitting element radiating green light, and the third light-emitting element is a light-emitting element radiating red light.

[0075] Optionally, the wiring layer includes:

[0076] The first layer is in contact with the light emitting element and the filling layer, and is electrically connected to the light emitting element;

[0077] The second layer has one side electrically connected to the first layer.

[0078] Optionally, the light emitting device further comprises:

[0079] A plurality of pads arranged at intervals are disposed in the opening of the insulating layer in a one-to-one correspondence and are electrically connected to the wiring layer in the opening of the insulating layer.

[0080] Optionally, the light emitting device further comprises:

[0081] The driving chip is arranged on the second surface of the transparent layer and spaced apart from the plurality of light emitting elements, or is arranged above the plurality of light emitting elements. The driving chip is electrically connected to the plurality of light emitting elements through the wiring layer.

[0082] Optionally, the light emitting device further comprises a plurality of solder pads arranged at intervals, and the plurality of solder pads arranged at intervals comprise:

[0083] At least two driving pads, including a first driving pad and a second driving pad, the first driving pad drivingly connected to at least two light-emitting elements, and the second driving pad drivingly connected to at least a driving chip;

[0084] The other pads are electrically connected to other terminals of the driver chip.

[0085] Optionally, the at least two driving pads include:

[0086] A first driving pad is electrically connected to the first light emitting element and the second light emitting element;

[0087] The second driving pad is electrically connected to the third light emitting element and is also electrically connected to the driving terminal of the driving chip.

[0088] Optionally, the at least two driving pads include:

[0089] A first driving pad is electrically connected to the first light emitting element and the second light emitting element;

[0090] A second driving pad is electrically connected to the third light emitting element;

[0091] The third driving pad is electrically connected to the driving terminal of the driving chip.

[0092] In the above two schemes, the third light emitting element (red light emitting element) and the other two light emitting elements are driven separately, which can avoid energy loss caused by the large difference in driving voltage between the red light emitting element and the other two light emitting elements.

[0093] Optionally, the at least two driving pads include:

[0094] A first driving pad is electrically connected to the first light emitting element, the second light emitting element and the third light emitting element;

[0095] The second driving pad is electrically connected to the driving terminal on the driving chip.

[0096] Optionally, the other pads include three pads, and the three pads are electrically connected to other different terminals on the driving chip respectively.

[0097] This embodiment also provides a display device, including:

[0098] Display substrate;

[0099] At least one light emitting device is disposed on the display substrate, each light emitting device is electrically connected to the display substrate, and the light emitting device is the above-mentioned light emitting device. This embodiment includes the above-mentioned light emitting device, which can also avoid the technical problem of color difference when observing at a large angle, and improve the display yield of the display device.

[0100] The present invention is described in detail below with reference to specific embodiments.

[0101] Example 1

[0102] This embodiment provides a light emitting device, referring to Figure 1b and 2 The light-emitting device includes a transparent layer 100 and a plurality of light-emitting elements (201, 202, 203).

[0103] The transparent layer 100 may have a light transmittance of more than 60% in the visible light range. Figure 1b and Figure 2, the transparent layer 100 includes a first surface 101 and a second surface 102 arranged opposite to each other, the first surface 101 is the light-emitting surface of the light-emitting device, that is, the light emitted by the light-emitting element is emitted outward through the first surface 101 of the transparent layer 100. The light-emitting device needs to have a certain thickness for easy use by the client, so the thickness of the transparent layer 100 is preferably greater than 10μm, specifically preferably 30μm to 50μm, 50μm to 100μm or 100μm to 300μm. In this embodiment, the transparent layer 100 includes a first transparent layer 101 and a second transparent layer 102, and the first transparent layer 101 is a transparent substrate. Optionally, the transparent substrate can be a light-transmitting substrate such as PET, optical glass, quartz, sapphire, transparent ceramic (zirconia), organic resin, etc. Optionally, the refractive index of the first transparent layer 101 ranges from 1.3 to 2.5, for example, 1.5 to 1.8. The second transparent layer 102 is an adhesive layer or a transfer layer, wherein the material of the second transparent layer 102 can be an elastic material such as silicone, so that the light-emitting element will be partially sunken into the second transparent layer 102 to keep the electrode surface of the light-emitting element at the same level, and the height difference of the light-emitting surface of each light-emitting element can be reduced, so that the light emitted from the side of the light-emitting element is absorbed by the filling layer 300 described below as much as possible, so as to improve the contrast of the light-emitting device. The thickness of the second transparent layer 102 is preferably 1μm to 15μm or 3μm to 10μm. If the thickness of the second transparent layer 102 is greater than 15μm, the alignment accuracy of the light-emitting element may be affected.

[0104] Reference Figure 1b , the first surface 101 of the transparent layer 100 includes a first side 1011, a second side 1012, a third side 1013 and a fourth side 1014 in the direction of the top projection, the first side 1011 is perpendicular to the second side 1012 and the fourth side 1014, the third side 1013 is parallel to the first side 1011, and the second side 1012 is parallel to the fourth side 1014. In this embodiment, the first side 1011 and the third side 1013 are short sides, and the second side 1012 and the fourth side 1013 are long sides. In other embodiments, the first side 1011 and the third side 1013 are long sides, the second side 1012 and the fourth side 1013 are short sides, or the lengths of the four sides are equal. The light-emitting device has a first extension direction X and a second extension direction Y in the top projection direction, and the first extension direction X and the second extension direction Y are perpendicular to each other. The first extending direction X is parallel to the second side 1012 , and the second extending direction Y is parallel to the first side 1011 .

[0105] Reference Figure 1b and 2, a plurality of light-emitting elements arranged at intervals are provided on the second surface 102 of the transparent layer 100, and are arranged at intervals along the extension direction (first extension direction X) of the second edge 1012 or the fourth edge 1014. The light-emitting element at the first position is the first light-emitting element, and the light-emitting element at the last position is the last light-emitting element. Among them, the angle between the line connecting the side of the first light-emitting element or the last light-emitting element closest to the edge of the light-emitting device to the edge of the light-emitting surface of the transparent layer corresponding to the closest side and the side wall of the transparent layer 100 is θ, and θ is greater than or equal to 30°. Therefore, this embodiment controls the angle between the light-emitting element located at the edge of the light-emitting device, that is, the line connecting the edge of the first light-emitting element and the last light-emitting element to the edge of the light-emitting surface of the transparent layer and the side wall of the transparent layer, so as to meet the light-emitting element close to the edge position to achieve the maximum light-emitting angle, thereby avoiding the problem of color difference caused by large-angle observation on both sides due to insufficient light emission.

[0106] Specifically, the transparent layer 100 has a thickness of H. The minimum distance between the edge of the first light emitting element or the last light emitting element and the edge of the second surface of the transparent layer is E, then E / H=tanθ. To ensure the maximum light emitting angle of the interface edge of the light emitting element at the light emitting surface of the transparent layer, That is, when the size of the light emitting device is reduced, the thickness of the corresponding transparent layer also needs to be reduced accordingly.

[0107] For example, when the transparent layer 100 is sapphire (the second transparent layer 120 can be ignored due to its thin thickness), the maximum light emission angle (i.e., critical angle) from sapphire (refractive index n1=1.7) to air (n2=1) is n1 is the refractive index of the transparent layer, n2 is the refractive index of air, and θ' = 36°. At this time, when E = 44μm, the H value needs to be ≤ 60.5μm to achieve the maximum light output angle. When the transparent layer 100 is ordinary optical glass (the second transparent layer 120 can be ignored due to its thin thickness), the maximum light output angle (i.e. critical angle) from ordinary optical glass (refractive index n1 = 1.52) to air (n2 = 1) is n1 is the refractive index of the transparent layer, n2 is the refractive index of air, and θ'=41°. At this time, when E=44μm, the H value needs to be ≤50.6μm to achieve the maximum light output angle (that is, to meet the critical angle). Moreover, when the E value decreases, the H value also needs to decrease accordingly. The θ value needs to be less than or equal to the critical angle θ' This can avoid light loss at the edge of the light emitting device.

[0108] Optionally, H ranges from 40 μm to 150 μm, and E ranges from 40 μm to 100 μm.

[0109] Optionally, the transparent layer is sapphire, H≤80μm. The transparent layer is optical glass, H≤60μm.

[0110] Optionally, the minimum distance E' from the edge of the plurality of light-emitting elements to the edge of the light-emitting device in the second extension direction Y is greater than the minimum distance E from the edge of the first light-emitting element or the last light-emitting element in the first extension direction X to the edge of the light-emitting device, and the minimum distance E' from the edge of the plurality of light-emitting elements to the edge of the light-emitting device in the second extension direction Y is greater than 15 μm. Since the minimum distance from the edge of the first light-emitting element or the last light-emitting element in the first extension direction X to the light-emitting device is small, it is only necessary to consider the light output loss problem from the edge of the first light-emitting element or the last light-emitting element in the first extension direction X to the transparent layer. In this embodiment, refer to Figure 2 , the plurality of light-emitting elements include a first light-emitting element 201, a second light-emitting element 202 and a third light-emitting element 203, and the first light-emitting element 201, the second light-emitting element 202 and the third light-emitting element 203 radiate light of different wavelength ranges, respectively, for example, the first light-emitting element 201 radiates blue light, the second light-emitting element 202 radiates green light, and the third light-emitting element 203 radiates red light. That is, the first light-emitting element is the first light-emitting element 201, and the last light-emitting element is the third light-emitting element 203. The light-emitting element in this embodiment mainly refers to a micrometer-level light-emitting diode, whose width or length ranges from 2 to 5 μm, 5 to 10 μm, 10 to 20 μm, 20 to 50 μm or 50 to 100 μm, and whose thickness ranges from 2 to 15 μm, preferably 5 to 10 μm. Specifically, each light-emitting element includes a semiconductor stack layer, which may include a first semiconductor layer, a second semiconductor layer, and an active layer arranged in sequence, wherein the first semiconductor layer is an N-type semiconductor layer, the second semiconductor layer is a P-type semiconductor layer, and the active layer is a multi-layer quantum well layer, which can provide red light, green light, or blue light radiation. The N-type semiconductor layer, the multi-layer quantum well layer, and the P-type semiconductor layer are only the basic constituent units of the light-emitting element, on this basis, the light-emitting element may also include other functional structural layers that have an optimizing effect on the performance of the light-emitting element.

[0111] In one embodiment, different light-emitting elements may have different semiconductor stacking layers, so as to directly radiate light of different wavelength ranges. The specific material of the semiconductor stacking layer is selected according to the wavelength of the radiated light, including but not limited to aluminum gallium arsenide, gallium arsenide phosphide, aluminum gallium indium phosphide, gallium nitride, indium gallium nitride, zinc selenide or gallium phosphide. In another embodiment, different light-emitting elements may have the same semiconductor stacking layer, for example, the semiconductor stacking layers in the first light-emitting element 201, the second light-emitting element 202 and the third light-emitting element 203 all radiate blue light, and a wavelength conversion layer is set on the light-emitting surface of the second light-emitting element 202 to convert the radiated blue light into green light, and a wavelength conversion layer is set on the light-emitting surface of the third light-emitting element 203 to convert the radiated blue light into red light. Each light-emitting element also includes a first electrode and a second electrode. The semiconductor stacking layer has a table surface exposing the first semiconductor layer, the first electrode is formed on the table surface and electrically connected to the first semiconductor layer, and the second electrode is formed on the second semiconductor layer and electrically connected to the second semiconductor layer.

[0112] In this embodiment, refer to Figure 4 and 5 The light emitting device further includes a filling layer 300, a wiring layer 400, an insulating layer 500 and a pad 600. Figure 5 A filling layer 300 is provided between adjacent light-emitting elements or around the side walls of the light-emitting elements. The provision of the filling layer 300 can prevent color mixing or light interference between adjacent light-emitting elements, thereby improving the contrast of the light-emitting module. The filling layer 300 is provided as a black glue layer that absorbs light. Specifically, the filling layer 300 can be a component formed by dispersing a black filling component with a particle size not greater than 1 μm in a transparent or translucent material such as silica gel, epoxy resin, polyimide, low-temperature glass, polysiloxane, polysilazane, etc. The black filling component in the filling layer 300 includes but is not limited to carbon black, titanium nitride, iron oxide, ferroferric oxide, iron powder, etc. The particle size range of the black filling component is preferably 10 to 100 nm, or 100 to 200 nm, or 200 to 300 nm, or 300 nm to 500 nm. The filling layer 300 can also be made of black dye.

[0113] Reference Figure 5, the wiring layer 400 is arranged above the light emitting element and the filling layer 300, and is electrically connected to each light emitting element through the metal wires therein. The wiring layer 400 includes a plurality of wirings, and the wiring layer 400 is surrounded by an insulating layer to electrically isolate adjacent wirings. The wiring layer 400 may be a single layer or multiple layers made of at least one material selected from titanium, copper, chromium, nickel, gold, platinum, aluminum, titanium nitride, tantalum nitride or tantalum. In the present embodiment, the wiring layer 400 includes a two-layer structure, specifically a first layer 401 and a second layer 402, the first layer 401 is in direct contact with the light emitting element, and the second layer 402 is formed on the first layer 401. The first layer 401 is used to adhere the second layer 402 to the light emitting element and the filling layer 300, and the second layer 402 mainly plays a conductive role. The material of the first layer 401 includes but is not limited to one or more of titanium, nickel, titanium nitride, tantalum nitride or tantalum, and the material of the second layer 402 includes but is not limited to one or more of copper, aluminum or gold. The wiring layer 400 can be prepared by sputtering, evaporation, or the like.

[0114] Reference Figure 4 and 5 , the insulating layer 500 is formed on the wiring layer 400, and the insulating layer 500 can be partially removed by exposure and development to form an opening to expose a portion of the surface of the wiring layer 400. The insulating layer 500 can be any insulating material, such as silicon dioxide or silicon nitride, or can be formed of materials such as epoxy resin, polysiloxane or photoresist to prevent the wiring layer from being oxidized and to electrically isolate different wirings to prevent leakage failure of the light-emitting device. The opening formed on the insulating layer 500 exposes part of the wiring layer 400, which is used to subsequently form a pad 600 on the wiring layer within the insulating layer opening.

[0115] Reference Figure 4 , a plurality of pads 600 arranged at intervals are arranged one by one in the opening of the insulating layer 500, and are electrically connected to the wiring layer 400 in the opening of the insulating layer 500. In this embodiment, the pads 600 include a first driving pad 601, a first other pad 6041, a second other pad 6042, and a third other pad 6043. Among them, the first driving pad 601 drives the first electrodes connected to the first light-emitting element 201, the second light-emitting element 202, and the third light-emitting element 203 at the same time, the first other pad 6041 is connected to the second electrode of the first light-emitting element 201, the second other pad 6042 is connected to the second electrode of the second light-emitting element 202, and the third other pad 6043 is connected to the second electrode of the third light-emitting element 203. In other embodiments, one more driving pad may be provided to drive the third light-emitting element 203 (red light-emitting element) separately to avoid energy consumption caused by inconsistent driving voltages of light-emitting elements of different colors.

[0116] Example 2

[0117] This embodiment provides a light emitting device. The similarities between the light emitting device and the embodiment 1 are not described in detail here. The difference is that, referring to Figures 6 to 8 The light emitting device in this embodiment further includes a driver chip 204, which controls the light emitting elements in the light emitting device so that the light emitting device can generate different colored lights. The driver chip 204 can be arranged on the second surface of the transparent layer at intervals from the multiple light emitting elements in Embodiment 1, or can be arranged above the multiple light emitting elements and electrically connected to the multiple light emitting elements through the wiring layer.

[0118] Reference Figures 6 to 8 The pad 600 of the light emitting device includes at least two driving pads and other pads, and the at least two driving pads are respectively a first driving pad 601 and a second driving pad 602. The first driving pad 601 drives and connects at least two light emitting elements, and the second driving pad 602 drives and connects at least a driving chip 204. There are three other pads, namely a first other pad 6041, a second other pad 6042 and a third other pad 6043. Among them, the three other pads are electrically connected to other different terminals on the driving chip 204 respectively. The first other pad 6041 (Row / Clk) and the second other pad 6042 (Col / Data) are grounded by inputting data signals and timing signals to the driving chip 204, and the third other pad 6043 (Gnd) is electrically connected to the driving chip 204.

[0119] In one example, refer to Figure 6 , at least two driving pads include a first driving pad 601 and a second driving pad 602. The first driving pad 601 (VGB) is electrically connected to the first light-emitting element 201, the second light-emitting element 202 and the third light-emitting element 203, and a driving voltage is input thereto. The second driving pad 602 is electrically connected to the driving chip 204 to input a driving voltage to the driving chip 204. Thus, the present embodiment can realize the separate driving of the light-emitting element and the driving chip 204, and avoid the energy loss caused by the inconsistent driving voltage between the light-emitting element and the driving chip 204. In this example, the driving chip 204 is arranged on the same layer as the light-emitting element.

[0120] In another example, referring to Figure 7, at least two driving pads include a first driving pad 601 and a second driving pad 602. The first driving pad 601 (VGB) is electrically connected to the first light-emitting element 201 and the second light-emitting element 202, and a driving voltage is input thereto. The second driving pad 602 (VR) is electrically connected to the third light-emitting element 203 and the driving chip 204, so as to simultaneously input a driving voltage to the third light-emitting element 203 and the driving chip 204, and the light-emitting device causes the light-emitting element to emit light with a specific brightness based on the driving voltage. The first light-emitting element 201 and the second light-emitting element 202 are respectively a blue light-emitting element and a green light-emitting element, and the third light-emitting element 203 is a red light-emitting element. Since the driving voltage required for the red light-emitting element is significantly different from the driving voltage of the blue light-emitting element and the green light-emitting element, driving the red light-emitting element alone can avoid unnecessary power consumption caused by simultaneous driving, which is beneficial to energy saving, and can also avoid damage to the light-emitting element caused by mismatching of the driving voltage, which is beneficial to the reliability and service life of the light-emitting element. In this example, the driving chip 204 and the plurality of light-emitting elements are stacked up and down.

[0121] In yet another example, referring to Figure 8 , at least two driving pads include a first driving pad 601, a second driving pad 602 and a third driving pad 603. The first driving pad 601 (VGB) is electrically connected to the first light-emitting element 201 and the second light-emitting element 202, and a driving voltage is input thereto. The second pad is electrically connected to the driving chip 204 to input a driving voltage to the driving chip 204. The third driving pad 603 (VR) is electrically connected to the third light-emitting element 203 to input a driving voltage to the third light-emitting element 203 alone. Since the red light-emitting element is driven separately by the third driving pad 603, unnecessary power consumption caused by simultaneous driving can be avoided, which is beneficial to energy saving, and damage to the light-emitting element caused by mismatching of the driving voltage can also be avoided, which is beneficial to the reliability and service life of the light-emitting element. The light-emitting device in this embodiment includes six pads, and every three pads are evenly distributed on both sides of the light-emitting device, which is beneficial to the uniformity and reliability of subsequent solid crystal. In this example, the driving chip 204 and the plurality of light-emitting elements are stacked up and down.

[0122] Example 3

[0123] This embodiment provides a display device, which includes a display substrate and at least one light-emitting device disposed on the display substrate. The light-emitting device is the light-emitting device in Embodiment 1 or Embodiment 2.

[0124] Specifically, the pad of each light-emitting device is electrically connected to the display substrate, and the light-emitting surface of the light-emitting device is away from the display substrate. When there are more than two light-emitting devices, more than two light-emitting devices are arranged at intervals on the display substrate, and each light-emitting device is electrically connected to the display substrate. This embodiment includes the light-emitting device in embodiment 1 or 2, and can also avoid the technical problem of color difference when observing at a large angle, thereby improving the display yield of the display device.

[0125] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A light emitting device, characterized in that: include: The transparent layer comprises a first surface and a second surface which are arranged opposite to each other; A plurality of light-emitting elements are arranged on the second surface of the transparent layer, and the first surface of the transparent layer forms a light-emitting surface of the light-emitting device; The plurality of light-emitting elements are sequentially arranged at intervals along the first extension direction; along the first extension direction, the light-emitting element at the first position is the first light-emitting element, and the light-emitting element at the last position is the last light-emitting element; The angle between a line from the side of the first light-emitting element or the last light-emitting element closest to the edge of the light-emitting device to the edge of the light-emitting surface of the transparent layer corresponding to the closest side and the side wall of the transparent layer is θ, and θ is greater than or equal to 30°. The light emitting device has a first extension direction and a second extension direction in a top projection direction, and the first extension direction is perpendicular to the second extension direction.

2. The light emitting device according to claim 1, characterized in that: The refractive index of the transparent layer ranges from 1.3 to 2.

5.

3. The light emitting device according to claim 1, characterized in that: The minimum distance from the edges of the multiple light-emitting elements to the edge of the light-emitting device in the second extension direction is greater than the minimum distance from the edge of the first light-emitting element or the last light-emitting element in the first extension direction to the edge of the light-emitting device, and the minimum distance from the edges of the multiple light-emitting elements to the edge of the light-emitting device in the second extension direction is greater than 15μm.

4. The light emitting device according to claim 1, characterized in that: The transparent layer has a thickness H, and in a direction parallel to the first extension direction, the minimum distance between the edge of the first light-emitting element or the last light-emitting element and the edge of the second surface of the transparent layer is E, wherein:

5. The light emitting device according to claim 4, characterized in that: The range of H is between 40 μm and 150 μm, and the range of E is between 40 μm and 100 μm.

6. The light emitting device according to claim 1, characterized in that: The transparent layer is sapphire, with H≤80 μm.

7. The light emitting device according to claim 1, characterized in that: The transparent layer is optical glass, with H≤60 μm.

8. The light emitting device according to claim 1, characterized in that: Wherein, n1 is the refractive index of the transparent layer, and n2 is the refractive index of air.

9. The light emitting device according to claim 1, characterized in that: The transparent layer comprises: First transparent layer; The second transparent layer is arranged on the first transparent layer, the plurality of light emitting elements are arranged at intervals on the second transparent layer, and a surface of the first transparent layer facing away from the second transparent layer is formed as a light emitting surface.

10. The light emitting device according to claim 9, characterized in that: The second transparent layer is an adhesive layer, and the first transparent layer is sapphire or optical glass.

11. The light emitting device according to claim 1, characterized in that: The light emitting device further comprises: A filling layer, disposed between adjacent light-emitting elements and around the plurality of light-emitting elements; A wiring layer, disposed above the light-emitting elements and the filling layer, and electrically connected to each of the light-emitting elements; An insulating layer, covering the wiring layer, wherein a plurality of openings are provided on the insulating layer, and each of the openings exposes a portion of the wiring layer; The plurality of light-emitting elements include a first light-emitting element, a second light-emitting element and a third light-emitting element. The first light-emitting element is a light-emitting element radiating blue light, the second light-emitting element is a light-emitting element radiating green light, and the third light-emitting element is a light-emitting element radiating red light.

12. The light emitting device according to claim 11, characterized in that: The wiring layer comprises: The first layer is in contact with the light emitting element and the filling layer, and is electrically connected to the light emitting element; The second layer has one side electrically connected to the first layer.

13. The light emitting device according to claim 12, characterized in that: The light emitting device further comprises: A plurality of pads arranged at intervals are disposed in the opening of the insulating layer in a one-to-one correspondence and are electrically connected to the wiring layer in the opening of the insulating layer.

14. The light emitting device according to claim 11, characterized in that: The light emitting device further comprises: A driving chip is arranged on the second surface of the transparent layer at intervals from the plurality of light emitting elements, or is arranged above the light emitting elements, and the driving chip is electrically connected to the light emitting elements through the wiring layer.

15. The light emitting device according to claim 14, characterized in that: The light emitting device further comprises a plurality of solder pads arranged at intervals, and the plurality of solder pads arranged at intervals comprise: At least two driving pads, including a first driving pad and a second driving pad, wherein the first driving pad is drivingly connected to at least two light-emitting elements, and the second driving pad is drivingly connected to at least the driving chip; Other pads are electrically connected to other terminals of the driving chip.

16. The light emitting device according to claim 15, characterized in that: The at least two driving pads include: A first driving pad, electrically connected to the first light emitting element and the second light emitting element; The second driving pad is electrically connected to the third light emitting element and to the driving terminal of the driving chip.

17. The light emitting device according to claim 15, characterized in that: The at least two driving pads include: A first driving pad, electrically connected to the first light emitting element and the second light emitting element; A second driving pad, electrically connected to the third light emitting element; The third driving pad is electrically connected to the driving terminal of the driving chip.

18. The light emitting device according to claim 15, characterized in that: The at least two driving pads include: A first driving pad is electrically connected to the first light emitting element, the second light emitting element and the third light emitting element; The second driving pad is electrically connected to the driving terminal on the driving chip.

19. The light emitting device according to claim 15, characterized in that: The other pads include three pads, and the three pads are electrically connected to other different terminals on the driving chip respectively.

20. A display device, characterized in that: include: Display substrate; At least one light-emitting device is disposed on the display substrate, each of the light-emitting devices is electrically connected to the display substrate, and the light-emitting device is the light-emitting device according to any one of claims 1 to 19.

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