Display device and manufacturing method thereof

Abstract

The embodiment of the invention provides a display device and a manufacturing method thereof, and the display device comprises a driving substrate which is configured to provide a driving signal; the plurality of light-emitting chips are positioned on the driving substrate, are electrically connected with the driving substrate and are configured to emit light in response to the driving signal; at least one light-emitting chip is packaged on one side of each lens unit; the lens unit has a first surface and a second surface; the first surface is one side of the lens unit adjacent to the light-emitting chip, and the second surface is one side of the lens unit deviating from the light-emitting chip; the first surface is configured to receive emitted light of the light-emitting chip; the second surface is configured to emit light emitted by the light-emitting chip; the first surface and the second surface are curved surfaces protruding in the direction away from the light-emitting chip. By arranging the lens unit, some light with a large divergence angle emitted by the light-emitting chip can be better converged or collimated, so that the divergence angle of the divergent light is reduced, light crosstalk is reduced, light waste is avoided, and the brightness and the contrast ratio are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a display device and a manufacturing method thereof. BACKGROUND

[0002] Micro Light Emitting Diode (Micro LED for short) display technology is a self-luminous display technology, which integrates arrayed Micro LED light emitting chips as light emitting units on a driving substrate to realize individual control and lighting, thereby outputting display images. With the emergence of Micro LED display technology, miniaturization and high resolution of display devices such as Augmented Reality (AR) display devices, Virtual Reality (VR) display devices, Near-Eye Display (NED), and Head Up Display (HUD) devices, etc. become possible.

[0003] The light emitted by the Micro LED light emitting chip is divergent light and has low light utilization. Currently, a micro lens structure is added to converge the divergent light emitted by the light emitting chip, so as to improve the light utilization and collimation. However, the current micro lens structure has limited light adjustment capability and limited light convergence capability, which will cause light efficiency loss, and it is difficult to control some light with large divergence angle, which is easy to cause waste or light crosstalk. SUMMARY

[0004] The display device provided by the embodiment of the present application comprises:

[0005] a driving substrate configured to provide a driving signal;

[0006] a plurality of light emitting chips located on the driving substrate and electrically connected with the driving substrate, configured to emit light in response to the driving signal;

[0007] a plurality of lens units, at least one of the light emitting chips is packaged on one side of the lens unit;

[0008] The lens unit has a first surface and a second surface; the first surface is a side of the lens unit adjacent to the light emitting chip, and the second surface is a side of the lens unit away from the light emitting chip;

[0009] The first surface is configured to receive the emitted light of the light emitting chip; and the second surface is configured to emit the emitted light of the light emitting chip;

[0010] The first surface and the second surface are both curved surfaces protruding away from the direction of the light emitting chip.

[0011] In some embodiments of the application, the display device further comprises a light-transmitting medium layer covering the plurality of light emitting chips, and the plurality of lens units are arranged on the light-transmitting medium layer.

[0012] The light-transmitting medium layer has a plurality of curved surfaces protruding away from the direction of the light emitting chip, and the protruding curved surfaces of the light-transmitting medium layer are arranged corresponding to the first surfaces of the lens units.

[0013] In some embodiments of the application, the radius of curvature of the first surface is the same as the radius of curvature of the second surface.

[0014] In some embodiments of the application, the radius of curvature of the first surface is different from the radius of curvature of the second surface.

[0015] In some embodiments of the application, the maximum width of the first surface is less than or equal to the maximum width of the second surface.

[0016] In some embodiments of the application, the lens unit comprises a first lens and a second lens, the first lens is arranged close to the light emitting chip, and the second lens is arranged on the side of the first lens away from the light emitting chip.

[0017] The refractive index of the first lens is the same as the refractive index of the second lens, or the refractive index of the first lens is different from the refractive index of the second lens.

[0018] The manufacturing method of the display device provided by the embodiments of the application comprises:

[0019] Electrically connecting a plurality of light emitting chips on a driving substrate;

[0020] Forming a light-transmitting medium layer covering each light emitting chip on each light emitting chip, and patterning the light-transmitting medium layer to form a plurality of curved surfaces protruding away from the direction of the light emitting chip, the protruding curved surfaces in the light-transmitting medium layer being arranged corresponding to the light emitting chips;

[0021] Forming a plurality of lens units on the light-transmitting medium layer, the lens units being arranged corresponding to the protruding curved surfaces of the light-transmitting medium layer, the surface of the lens unit close to the light-transmitting medium layer being a curved surface recessed away from the direction of the light emitting chip, and the surface of the lens unit away from the light-transmitting medium layer being a curved surface protruding away from the direction of the light emitting chip.

[0022] The display device and the manufacturing method thereof provided by the embodiment of the present application include: a driving substrate configured to provide a driving signal; a plurality of light emitting chips located on the driving substrate and electrically connected with the driving substrate, and configured to emit light in response to the driving signal; and a plurality of lens units, at least one light emitting chip is arranged on one side of the lens unit; the lens unit has a first surface and a second surface; the first surface is the side of the lens unit adjacent to the light emitting chip, and the second surface is the side of the lens unit away from the light emitting chip; the first surface is configured to receive the emitted light of the light emitting chip; the second surface is configured to emit the emitted light of the light emitting chip; and the first surface and the second surface are both curved surfaces protruding away from the light emitting chip. By arranging the lens unit, the light with a large divergence angle emitted by the light emitting chip can be better collected, converged or collimated, so as to reduce the divergence angle of the divergent light, thereby reducing the light crosstalk and avoiding light waste, and improving the brightness and contrast. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The structure schematic diagram of the display device provided by the embodiment of the present application is shown in FIG. 1.

[0024] Figure 2 The light path in the display device in the related art is shown in FIG. 2.

[0025] Figure 3 The light path in the display device provided by the embodiment of the present application is shown in FIG. 3.

[0026] Figure 4 The structure schematic diagram of the display device provided by the embodiment of the present application is shown in FIG. 4.

[0027] Figure 5 The structure schematic diagram of the display device provided by the embodiment of the present application is shown in FIG. 5.

[0028] Figure 6 The structure schematic diagram of the display device provided by the embodiment of the present application is shown in FIG. 6.

[0029] Figure 7 The structure schematic diagram of the display device provided by the embodiment of the present application is shown in FIG. 7.

[0030] Figure 8 The structure schematic diagram of the display device provided by the embodiment of the present application is shown in FIG. 8.

[0031] Figure 9 The structure schematic diagram of the display device provided by the embodiment of the present application is shown in FIG. 9.

[0032] Figure 10 The structure schematic diagram of the display device provided by the embodiment of the present application is shown in FIG. 10.

[0033] Figure 11 The structure schematic diagram of the display device provided by the embodiment of the present application is shown in FIG. 11.

[0034] Figure 12 Structure diagram of display device provided by the embodiment of the present application;

[0035] Figure 13 Structure diagram of display device provided by the embodiment of the present application;

[0036] Figure 14 Structure diagram of display device provided by the embodiment of the present application;

[0037] Figure 15 Structure diagram of display device provided by the embodiment of the present application;

[0038] Figure 16 Structure diagram of display device provided by the embodiment of the present application;

[0039] Figure 17 Structure diagram of display device provided by the embodiment of the present application;

[0040] Figure 18 Structure diagram of display device provided by the embodiment of the present application;

[0041] Figure 19 Structure diagram of display device provided by the embodiment of the present application;

[0042] Figure 20 Structure diagram of display device provided by the embodiment of the present application;

[0043] Figure 21 Structure diagram of display device provided by the embodiment of the present application;

[0044] Figure 22 Structure diagram of display device provided by the embodiment of the present application;

[0045] Figure 23 Structure diagram of display device provided by the embodiment of the present application;

[0046] Figure 24 Flow chart of manufacturing method of display device provided by the embodiment of the present application;

[0047] Figure 25 Process structure diagram of manufacturing display device provided by the embodiment of the present application;

[0048] Figure 26 Process structure diagram of manufacturing display device provided by the embodiment of the present application;

[0049] Figure 27The third structural diagram of the manufacturing process of the display device provided in the embodiment of the present invention;

[0050] Figure 28 The fourth structural diagram of the manufacturing process of the display device provided in the embodiments of the present invention;

[0051] Figure 29 Fifth structural diagram of the manufacturing process of the display device provided in the embodiments of the present invention;

[0052] Figure 30 This is the sixth structural diagram illustrating the manufacturing process of the display device provided in this embodiment of the invention.

[0053] Figure 31 The seventh structural diagram of the manufacturing process of the display device provided in the embodiments of the present invention;

[0054] Figure 32 Eighth structural diagram illustrating the manufacturing process of the display device provided in this embodiment of the invention;

[0055] Figure 33 The ninth structural diagram of the manufacturing process of the display device provided in the embodiments of the present invention;

[0056] Figure 34 The tenth structural diagram of the manufacturing process of the display device provided in the embodiment of the present invention;

[0057] Figure 35 This is the eleventh structural diagram of the manufacturing process of the display device provided in the embodiment of the present invention. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Furthermore, the embodiments and features in the embodiments of the present invention can be combined with each other without conflict. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0059] Unless otherwise defined, technical terms or scientific terms used in the present application shall have the ordinary meaning as understood by a person of ordinary skill in the art to which the present application pertains. The terms "first", "second", and similar terms are used herein to distinguish one element from another, and are not necessarily used in a sequence or to denote importance or quantity. The terms "comprise", "comprising", "include", "including" and the like are used herein to mean including but not limited to as set out herein. The terms "connected", "coupled", and the like are used herein to mean either a direct connection or an indirect connection through one or more intervening articles of manufacture and / or circuit elements.

[0060] It should be noted that the size and shape of the figures in the drawings do not reflect the true proportions, but only serve to illustrate the content of the present application. The same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout the drawings.

[0061] Micro Light Emitting Diode (Micro LED) display technology is a self-emitting display technology, which integrates arrayed Micro LED light emitting chips as light emitting units on a driving substrate to realize individual control and lighting, thereby outputting a display image. With the emergence of Micro LED display technology, miniaturization and high resolution of display devices such as Augmented Reality (AR) display devices, Virtual Reality (VR) display devices, Near-Eye Display (NED), and Head Up Display (HUD) devices, etc. become possible.

[0062] The light emitted by the Micro LED light emitting chip is divergent light and has low light utilization. Currently, by increasing the micro-lens structure, the divergent light emitted by the light emitting chip is condensed, and the divergent light emitted by the light emitting chip is converged and collimated to improve the light utilization and collimation. However, the current micro-lens structure has limited light adjustment capability and limited light convergence capability, which will cause light efficiency loss, and for some light with a large divergence angle, it is difficult to regulate and control, which is easy to cause waste or light crosstalk.

[0063] Therefore, the embodiments of the present application provide a display device, Figure 1 A structure schematic diagram of the display device provided by the embodiments of the present application is shown.

[0064] As shown in Figure 1 , the display device comprises a driving substrate 1, a light emitting chip 2, a lens unit 3, and a light-transmitting medium layer 4.

[0065] The driving substrate 1 is configured to provide driving signals; the driving substrate 1 is located at the bottom of the display device, and its size is generally adapted to the overall size of the display device, and the size of the driving substrate 1 is slightly smaller than the size of the display device.

[0066] The shape of the driving substrate 1 can be adaptively set according to the display device, which is not limited here.

[0067] Exemplarily, the driving substrate 1 can adopt a printed circuit board (PCB), for example, a high-density interconnection (HDI) circuit board.

[0068] A plurality of light emitting chips 2 are located on the driving substrate 1 and are electrically connected with the driving substrate 1, and are configured to emit light in response to the driving signals; that is, various information such as display of text, graphics, animation, market situation, video, and video signal lights can be realized through the cooperation of the plurality of light emitting chips 2.

[0069] Exemplarily, the light emitting chip 2 can include a red light chip, a green light chip, and a blue light chip, wherein the red light chip is used to emit red light, the green light chip is used to emit green light, and the blue light chip is used to emit blue light, thereby realizing full-color display. Alternatively, the light emitting chip 2 can be used to emit light of the same color, and a color conversion component is further used to realize full-color display.

[0070] A plurality of lens units 3 are provided on one side of at least one light emitting chip 2; that is, the lens unit 3 is correspondingly arranged with the light emitting chip 2; wherein the lens unit 3 can converge the divergent light emitted by the light emitting chip 2, and the divergent light emitted by the light emitting chip 2 is converged and collimated to improve the light utilization rate and collimation.

[0071] The lens unit 3 has a first surface 301 and a second surface 302; the first surface 301 is the side of the lens unit 3 adjacent to the light emitting chip 2, and the second surface 302 is the side of the lens unit 3 away from the light emitting chip 2.

[0072] The first surface 301 is configured to receive the emitted light of the light emitting chip 2; the second surface 302 is configured to emit the emitted light of the light emitting chip 2.

[0073] The first surface 301 and the second surface 302 are both curved surfaces convex in the direction away from the light emitting chip 2.

[0074] By configuring the first and second surfaces of the lens unit to be curved surfaces that bulge away from the light-emitting chip, the present invention can better converge or collimate light emitted by the light-emitting chip with a large divergence angle, thereby reducing the divergence angle of the divergent light, reducing light crosstalk and avoiding light waste, thus improving the light output efficiency of the entire display device and increasing the brightness and contrast of the display device.

[0075] Figure 2 This is a schematic diagram of the optical path in a display device provided in the embodiments of the present invention; Figure 3 This is a schematic diagram of the optical path in a display device provided in an embodiment of the present invention.

[0076] For example, the light-emitting chip 2 emits diverging light rays L1 and L2; wherein, the lens unit 3 in the related technology has limited ability to adjust the light, such as Figure 2 As shown, the diverging light L1 emitted by the light-emitting chip 2 enters the lens unit 3. The initial divergence angle of the diverging light L1 is α, and the divergence angle of the diverging light L1 after adjustment by the lens unit 3 is β. The difference between the initial divergence angle α and the adjusted divergence angle β is not very large. Therefore, the lens unit 3 has limited ability to adjust the diverging light L1 and limited ability to converge the diverging light L1, which will lead to a loss of light efficiency. Furthermore, the diverging light L2 emitted by the light-emitting chip 2 cannot enter the lens unit 3. That is, the lens unit 3 has difficulty controlling light with a large divergence angle. The diverging light L2 will enter the side wall of the light-transmitting medium layer 4, which will easily cause light waste or light crosstalk.

[0077] The lens unit 3 in this embodiment of the invention can solve the above problems, such as... Figure 3 As shown, both the diverging rays L1 and L2 emitted by the light-emitting chip 2 can enter the lens unit 3. The first surface 301 of the lens unit 3 is a concave curved surface facing away from the light-emitting chip 2, which can converge the diverging rays L1 and L2. The diverging ray L2 is refracted after passing through the first surface of the lens unit 3, and thus the diverging ray L2 will be incident on the second surface 302 of the lens unit 3, thereby reducing optical crosstalk and avoiding light waste. The second surface 302 of the lens unit 3 is convex facing away from the light-emitting chip. The curved surface of the lens unit 3 can converge the diverging rays L1 and L2. The initial divergence angle of the diverging ray L1 is α, and the divergence angle of the diverging ray L1 after adjustment by the lens unit 3 is β. Since the initial divergence angle α and the adjusted divergence angle β are significantly different, the lens unit 3 has a strong ability to adjust the diverging ray L1 and can better reduce the divergence angle of the diverging ray. In other words, the lens unit 3 has a better converging and collimating effect, which can improve the light output efficiency of the entire display device and increase the brightness and contrast of the display device.

[0078] In some embodiments of the present invention, such asFigure 1 As shown, the display device further comprises a light-transmitting medium layer 4 covering the plurality of light-emitting chips 2, and the plurality of lens units 3 are located on the light-transmitting medium layer 4; the light-transmitting medium layer 4 has a plurality of curved surfaces protruding away from the light-emitting chips 2; and the protruding curved surfaces of the light-transmitting medium layer 4 are arranged in correspondence with the first surfaces 301 of the lens units 3. The light-transmitting medium layer can be used to protect the light-emitting chips, prevent the light-emitting chips from being damaged, reduce production cost, and facilitate the formation of the first surfaces of the subsequent lens units.

[0079] Figures 4 to 23 FIGS. 1-3 are structural schematic diagrams of display devices provided by embodiments of the present application.

[0080] In some embodiments of the present application, the radius of curvature of the first surface 301 is the same as the radius of curvature of the second surface 302, as shown in FIG. 1. Figure 1 、 Figure 6 、 Figure 9 、 Figure 12 、 Figure 15 、 Figure 16 、 Figure 20 and Figure 22 As shown, the radius of curvature is the same, which facilitates the design of the overall lens unit and can share a hard mask layer MASK in the manufacturing process, thereby simplifying the process difficulty, improving the yield, and achieving the light adjustment target by adjusting the refractive index according to the refraction principle: n1sinθ1=n2sinθ2, n1>n2, then sinθ1<sinθ2, and further θ1<θ2.

[0081] In some embodiments of the present application, the radius of curvature of the first surface 301 is different from the radius of curvature of the second surface 302. The first surface 301 is mainly used to collect light at a large angle, and the second surface 302 is mainly used to control the light collecting ability. The greater the radius of curvature, the flatter the circular arc, and the smaller the radius of curvature, the steeper the circular arc. The greater the radius of curvature of the first surface 301, the flatter the circular arc of the first surface 301, and the thinner the light-transmitting medium layer, thereby the lower the process difficulty (i.e., high flatness, which is beneficial to subsequent process manufacturing). The smaller the radius of curvature of the first surface 301, the steeper the circular arc of the first surface 301, and the stronger the light collecting ability. The greater the radius of curvature of the second surface 302, the flatter the circular arc of the second surface 302, and the lower the process difficulty and the lower the manufacturing cost. The smaller the radius of curvature of the second surface 302, the steeper the circular arc of the second surface 302, and the stronger the light collecting ability.

[0082] For example, the radius of curvature of the first surface 301 is greater than the radius of curvature of the second surface 302, as shown in FIG. 2. Figure 4 、 Figure 7 、 Figure 10 、 Figure 13 、 Figure 17 、 Figure 19 and Figure 23As shown in the figures, when the light-transmitting medium layer 4 is relatively thin, the curvature radius of the first surface 301 can be greater than that of the second surface 302, the process difficulty of the first surface 301 is relatively low, and the light collecting effect of the second surface of the lens unit is relatively strong, thereby improving the light collecting ability of the lens unit, reducing the light efficiency loss, and further improving the brightness and contrast of the display device. Moreover, the process difficulty of the first surface of the lens unit is reduced, and the overall lens unit achieves better effects while reducing the process difficulty.

[0083] For example, the curvature radius of the first surface is less than that of the second surface, as shown in the figures Figure 5 、 Figure 8 、 Figure 11 、 Figure 14 、 Figure 18 and Figure 21 When the light-transmitting medium layer 4 is relatively thick, the curvature radius of the first surface can be less than that of the second surface, and the light collecting ability of the first surface of the lens unit is relatively strong. For light with a relatively large divergence angle, the lens unit can collect light rays in all directions, reduce the probability of light loss, improve the light collecting ability, and further strengthen the light collecting ability of the lens unit, reduce the light efficiency loss, and avoid light waste to the greatest extent, thereby improving the brightness and contrast of the display device. Moreover, the process difficulty of the second surface of the lens unit is reduced, and the overall lens unit achieves better effects while reducing the process difficulty.

[0084] The numerical range of the curvature radius of the first surface 301 and the curvature radius of the second surface 302 can be set according to requirements, for example: the pitch of the pixel is P, the size of the light-emitting chip is Q, and the height of the light-emitting chip is H, then P / 2≤the curvature radius of the first surface <(P 2 +4H 2 ) / 8H; P / 2≤the curvature radius of the second surface <∞.

[0085] In some embodiments of the present application, the maximum width of the first surface 301 is greater than or equal to the maximum width of the second surface 302. For example, the maximum width of the first surface 301 is equal to the maximum width of the second surface 302, as shown in the figures Figure 1 、 Figure 4 、 Figure 5 、 Figure 9 、 Figure 10 、 Figure 11 、 Figure 15 、 Figure 16 、 Figure 18 、 Figure 20 and Figure 22As shown in the drawings, the maximum width of the first face of the lens unit is consistent with the maximum width of the second face, and the pixel pitch space is used as much as possible to regulate the light emitted by the light-emitting chip. Assuming that the pixel pitch is P, the size of the light-emitting chip is Q, the width of the second face is equal to P or slightly less than P; Q≤ the width of the first face≤P. And facilitate the overall design of the lens unit, thereby simplifying the process difficulty and improving the production efficiency.

[0086] For example, the maximum width of the first face 301 is less than the maximum width of the second face 302, as shown in Figure 6 、 Figure 7 、 Figure 8 、 Figure 12 、 Figure 13 、 Figure 14 、 Figure 17 、 Figure 19 、 Figure 21 and Figure 23 As shown, the maximum width of the first face of the lens unit is less than the maximum width of the second face. When the width of the first face is small, there is a gap between the first faces of two adjacent lens units, which can ensure the supportability of the lens unit, that is, improve the stability of the lens unit structure, avoid damage to the lens unit, and improve the cost rate.

[0087] It should be noted that the lens unit 3 can be integrally formed, as shown in Figure 1 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 16 、 Figure 17 、 Figure 20 and Figure 21 In this way, the process difficulty can be reduced, the production efficiency can be improved, and the production cost can be ensured. The lens unit 3 can also be made separately, as shown in Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 、 Figure 13 、 Figure 14 、 Figure 15 、 Figure 18 、 Figure 19 、 Figure 22 and Figure 23 In this way, the lens unit can be designed separately according to the requirements, so as to ensure the light focusing and collimating ability of the lens unit while ensuring that the lens unit can adapt to more light type regulation requirements.

[0088] In some embodiments of the present application, the lens unit 3 comprises: a first lens 31 and a second lens 32; the first lens 31 is arranged close to the light-emitting chip 2, and the second lens 32 is located on the side of the first lens 31 away from the light-emitting chip 2; as shown in Figure 9 ,Figure 10 , Figure 11 , Figure 12 , Figure 13 , Figure 14 , Figure 15 , Figure 18 , Figure 19 , Figure 22 and Figure 23 As shown, the refractive index of the first lens 31 is the same as that of the second lens 32. That is, the first lens 31 and the second lens 32 are made of the same material. Then, the first lens 31 and the second lens 32 can be integrally formed. Such a setting facilitates the overall design of the lens unit, thereby simplifying the process difficulty and increasing the yield. Of course, the first lens 31 and the second lens 32 can also be made of the same material separately to avoid process errors. Using the same material can avoid using multiple materials and reduce costs.

[0089] In some embodiments of the present invention, the refractive index of the first lens 31 is different from that of the second lens 32; that is, the first lens 31 and the second lens 32 are made of different materials. Then, the first lens 31 and the second lens 32 can be made separately. Such a setting can design the first lens and the second lens in the lens unit separately according to requirements, so as to ensure that the lens unit can adapt to more light type regulation requirements and ensure the design freedom of the lens unit.

[0090] Exemplarily, according to the refraction principle: n1sinθ1 = n2sinθ2, n1>n2, then sinθ1<sinθ2, and further θ1<θ2. Design and select the refractive indices of the first lens and the second lens according to this principle. Among them, the refractive index range is approximately between 1 and 2.5. The refractive index of common materials is around 1.5. For example, the refractive index of silicon dioxide is 1.46, the refractive index of fused quartz is 1.459, the refractive index of quartz is 1.544, the refractive index of silicon nitride is 2.0458, the refractive index of glass is 1.4 - 1.8, the refractive index of alumina is 1.76, the refractive index of crystal is 2, the refractive index of diamond is 2.418, the refractive index of SU-8 is 1.6, and the refractive index of photoresist is 1.5 - 1.7.

[0091] Exemplarily, the lens units 3 are arranged adjacent to each other. As shown in Figure 1 , Figures 4 to 14 , all the divergent light emitted by the light-emitting chip can enter the optical system of the lens unit, so that the lens unit can collimate and converge, avoiding light loss.

[0092] Exemplarily, the lens units 3 are arranged at intervals. As shown in Figure 15 , such a setting is to provide a reserved space to provide space for implementing other settings such as retaining walls, etc., to avoid being unable to form other process structures.

[0093] In some embodiments of the present application, a barrier wall 5 is arranged between adjacent light emitting chips 2, and the light-transmitting medium layer 4 is filled between the barrier walls 5, as shown in FIG. 3. Figures 16 to 23 By arranging the barrier wall between the adjacent light emitting chips, the light emitted by the adjacent light emitting chips can be prevented from interfering with each other, the crosstalk interference is further reduced, i.e., the light crosstalk is avoided, and the light emitting effect is improved.

[0094] As shown in FIG. 4, the height of the barrier wall 5 can be the same as the thickness of the first lens 31, so that the light leakage is avoided, the light loss is prevented, and the light efficiency is improved. Figure 18 Figure 19 Figure 22 Figure 23 As shown in FIG. 4, the height of the barrier wall 5 can be the same as the thickness of the first lens 31, so that the light leakage is avoided, the light loss is prevented, and the light efficiency is improved.

[0095] In some embodiments of the present application, a reflective layer 50 is arranged on the surface of the barrier wall 5 facing the light emitting chip 2, as shown in FIG. 5. Figures 20 to 23 By arranging the reflective layer, the crosstalk interference is further reduced, the light efficiency is improved, and the utilization rate of the light is further improved.

[0096] In some embodiments of the present application, the light emitting chip 2 is an LED chip, a Mini LED chip or a Micro LED chip.

[0097] It should be noted that the light emitting diode (LED) display technology refers to a display technology using an LED as a direct light emitting unit. With the increasing requirements for the resolution and display effect of display devices, a Mini LED chip or a Micro LED chip can be used as a light emitting unit in an LED display device. The Mini LED chip or the Micro LED chip is a miniaturized LED chip, and the size thereof can reach the micron level, for example, the size of the Mini LED chip is less than 500 μm, and the size of the Micro LED chip is less than 100 μm. When the size of the LED chip is reduced to the pixel level, the Mini LED chip or the Micro LED chip can be directly used as a light emitting unit for image display.

[0098] Since the Mini LED and the Micro LED have the characteristics of low power consumption, long service life, high stability and self-luminous without the need for a backlight source, and have the advantages of energy saving and high integration, they can be applied to almost all mainstream display fields and are considered to be an ideal form of future display technology.

[0099] ​​​In the specific embodiments, the display device can be any product or component with display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, a smart watch, a wearable device, AR\VR, HUD, a projector, etc. Other essential components of the display device are understood by those skilled in the art and are not described here again, and should not be regarded as a limitation on the present application.

[0100] Figure 24 A flow chart of a manufacturing method of the display device provided by the embodiments of the present application is shown in FIG. 1.

[0101] The embodiments of the present application also provide a manufacturing method of the display device, which includes the following steps as shown in FIG. 2: Figure 24

[0102] S100, electrically connecting a plurality of light emitting chips on a driving substrate;

[0103] S200, forming a light-transmitting medium layer covering the light emitting chips on each light emitting chip, and patterning the light-transmitting medium layer to form a plurality of curved surfaces protruding in a direction away from the light emitting chips;

[0104] S300, forming a plurality of lens units on the light-transmitting medium layer.

[0105] At least one light emitting chip package is arranged on one side of the protruding curved surface in the light-transmitting medium layer.

[0106] The lens units are arranged at the positions of the protruding curved surfaces of the light-transmitting medium layer. The surface close to the light-transmitting medium layer of the lens unit and the surface away from the light-transmitting medium layer of the lens unit are both curved surfaces protruding in a direction away from the light emitting chips.

[0107] In some embodiments of the present application, after the plurality of light emitting chips are electrically connected on the driving substrate, and before the light-transmitting medium layer covering the light emitting chips is formed on each light emitting chip, the method further includes forming a barrier wall on the driving substrate, and the barrier wall is located between adjacent light emitting chips.

[0108] In some embodiments of the present application, the method further includes forming a reflective layer on the barrier wall.

[0109] Figure 25 A structure diagram of a manufacturing process of the display device provided by the embodiments of the present application is shown in FIG. 3. Figure 26 A structure diagram of another manufacturing process of the display device provided by the embodiments of the present application is shown in FIG. 4. Figure 27 A structure diagram of another manufacturing process of the display device provided by the embodiments of the present application is shown in FIG. 5. Figure 28 A structure diagram of another manufacturing process of the display device provided by the embodiments of the present application is shown in FIG. 6. Figure 29 A structure diagram of another manufacturing process of the display device provided by the embodiments of the present application is shown in FIG. 7. Figure 30 ​This is the sixth structural diagram illustrating the manufacturing process of the display device provided in this embodiment of the invention. Figure 31 The seventh structural diagram of the manufacturing process of the display device provided in the embodiments of the present invention; Figure 32 Eighth structural diagram illustrating the manufacturing process of the display device provided in this embodiment of the invention; Figure 33 The ninth structural diagram of the manufacturing process of the display device provided in the embodiments of the present invention; Figure 34 The tenth structural diagram of the manufacturing process of the display device provided in the embodiment of the present invention; Figure 35 This is the eleventh structural diagram of the manufacturing process of the display device provided in the embodiment of the present invention.

[0110] The specific manufacturing method of the display device is as follows:

[0111] like Figure 25 As shown, multiple light-emitting chips 2 are electrically connected to the driving substrate 1, thus completing the assembly process of the light-emitting chips 2.

[0112] like Figure 26 As shown, a barrier 5 is formed on the driving substrate 1. The barrier 5 is arranged in a grid on the driving substrate 1, and a light-emitting chip 2 is formed in a grid formed by adjacent barrier 5.

[0113] For example, the barrier can be made of materials such as photoresist, SU8, polyimide, silicon dioxide, silicon nitride, etc., without limitation.

[0114] like Figure 27 As shown, a reflective layer 50 is formed on the barrier 5 by means of atomic layer deposition, chemical vapor deposition, evaporation or sputtering.

[0115] For example, the reflective layer contains a metallic material, which may be aluminum, gold, silver, nickel, palladium, platinum, vanadium, chromium, titanium, or other metals or alloys with good reflective properties, and is not limited here.

[0116] like Figure 28 As shown, the material required for depositing the light-transmitting medium layer on the light-emitting chip 2 is deposited to form the light-transmitting medium layer 4, which covers multiple light-emitting chips 2 and can protect the light-emitting chips 2.

[0117] For example, the light-transmitting medium layer can be made of materials such as silicon dioxide or silicon nitride, which are not limited here.

[0118] like Figure 29 As shown, a photoresist layer 6 is formed by spin-coating photoresist onto the light-transmitting dielectric layer 4.

[0119] like Figure 30As shown, the photoresist layer 6 is patterned by using a process such as a high-temperature reflow process, a gray-tone mask photolithography process, a dry etching pattern transfer process, or a molding / embossing process, and part of the photoresist layer 6 is removed to form a plurality of patterns of curved surfaces protruding away from the light-emitting chip in the transparent medium layer 4 in the photoresist layer 6.

[0120] The gray-tone photolithography process can be an optical process using a gray-tone mask plate, which is a type of mask plate in which different regions on the mask plate plane can have different transmittances. The gray-tone mask plate can include a plurality of regions with different transmittances on the mask plate plane. The lower the transmittance of a region, the less light passes through the region during exposure, and the thicker the photoresist in the corresponding region on the photoresist layer. The higher the transmittance of a region, the more light passes through the region during exposure, and the thinner the photoresist in the corresponding region on the photoresist layer.

[0121] As shown in FIG. 4, the photoresist layer 6 is patterned by using a process such as a high-temperature reflow process, a gray-tone mask photolithography process, a dry etching pattern transfer process, or a molding / embossing process, and part of the photoresist layer 6 is removed to form a plurality of patterns of curved surfaces protruding away from the light-emitting chip in the transparent medium layer 4 in the photoresist layer 6. Figure 31 As shown in FIG. 5, the transparent medium layer 4 is etched using the patterned photoresist layer 7 as a mask to form a plurality of patterns of curved surfaces protruding away from the light-emitting chip 2 in the transparent medium layer 4.

[0122] Figure 32 As shown in FIG. 6, a transparent material required for the first lens 31 in the lens unit is deposited on the transparent medium layer 4 in which the plurality of patterns of curved surfaces protruding away from the light-emitting chip 2 are formed to form the first lens 31, which has a curved surface recessed away from the light-emitting chip 2, i.e., the first lens 31 includes the first surface 301 of the lens unit.

[0123] For example, the transparent material can be transparent acrylic resin, transparent glass, UV glue, epoxy glue material, etc. The transparent material can also be doped with diffusion particles to improve the performance of the lens unit. The diffusion particles can include polycarbonate (PC), polystyrene (PS) plastic, polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), optical-grade silica gel, and at least one of inorganic light-diffusing materials such as silicon dioxide, titanium dioxide, calcium carbonate, magnesium silicate, barium sulfate, etc.

[0124] As shown in FIG. 7, a lens material required for the second lens is deposited on the first lens 31 to form a second lens layer 320, and then photoresist is spin-coated on the second lens layer 320 to form the photoresist layer 7 again. Figure 33 As shown in FIG. 8, the lens material required for the second lens is deposited on the first lens 31 to form a second lens layer 320, and then photoresist is spin-coated on the second lens layer 320 to form the photoresist layer 7 again.

[0125] Figure 34 ​​As shown, the photoresist layer 6 is patterned by a process such as a high-temperature reflow process, a gray mask photolithography process, a dry etching pattern transfer process, or a molding / embossing process, etc., to remove part of the photoresist layer 6 and form a pattern of the second lens in the photoresist layer 6.

[0126] As shown, the photoresist layer 6 is patterned by a process such as a high-temperature reflow process, a gray mask photolithography process, a dry etching pattern transfer process, or a molding / embossing process, etc., to remove part of the photoresist layer 6 and form a pattern of the second lens in the photoresist layer 6. Figure 35 As shown, the photoresist layer 6 is patterned by a process such as a high-temperature reflow process, a gray mask photolithography process, a dry etching pattern transfer process, or a molding / embossing process, etc., to remove part of the photoresist layer 6 and form a pattern of the second lens in the photoresist layer 6.

[0127] Although preferred embodiments of the application have been described herein, changes and modifications can be suggested to one skilled in the art, and it is intended that the scope of the application be limited only by the scope of the appended claims, including the equivalents thereof.

[0128] Obviously, numerous modifications and variations of the present embodiments are possible in light of the above teachings. It is therefore to be understood that within the scope of the claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A display device, characterized in that, include: A driving board is configured to provide driving signals; Multiple light-emitting chips are located on the driving substrate, electrically connected to the driving substrate, and configured to emit light in response to the driving signal; Multiple lens units, at least one of the light-emitting chip packages is disposed on one side of the lens unit; The lens unit has a first surface and a second surface; the first surface is the side of the lens unit adjacent to the light-emitting chip, and the second surface is the side of the lens unit away from the light-emitting chip; The first surface is configured to receive the emitted light from the light-emitting chip; The second surface is configured to emit light from the light-emitting chip; Both the first surface and the second surface are curved surfaces that bulge away from the light-emitting chip.

2. The display device as claimed in claim 1, characterized in that, Also includes: A light-transmitting medium layer covers the plurality of light-emitting chips, and the plurality of lens units are located on the light-transmitting medium layer; The light-transmitting medium layer has multiple curved surfaces protruding away from the light-emitting chip, and the protruding curved surfaces of the light-transmitting medium layer are correspondingly arranged with the first surface in the lens unit.

3. The display device as claimed in claim 1, characterized in that, The radius of curvature of the first surface is the same as that of the second surface.

4. The display device as claimed in claim 1, characterized in that, The radius of curvature of the first surface is different from that of the second surface.

5. The display device as claimed in claim 1, characterized in that, The maximum width of the first face is less than or equal to the maximum width of the second face.

6. The display device as claimed in claim 1, characterized in that, The lens unit includes: a first lens and a second lens; the first lens is disposed close to the light-emitting chip, and the second lens is located on the side of the first lens away from the light-emitting chip; The refractive index of the first lens is the same as that of the second lens; or, the refractive index of the first lens is different from that of the second lens.

7. A method for manufacturing a display device, characterized in that, include: Multiple light-emitting chips are electrically connected to the driving substrate; A light-transmitting medium layer is formed on each light-emitting chip, and the light-transmitting medium layer is patterned to form multiple curved surfaces protruding away from the light-emitting chip. At least one of the light-emitting chips is packaged on one side of the protruding curved surface in the light-transmitting medium layer. Multiple lens units are formed on the light-transmitting medium layer; the lens units are disposed at the positions of the convex curved surfaces of the light-transmitting medium layer. The surfaces of the lens unit near the light-transmitting medium layer and the surfaces of the lens unit away from the light-transmitting medium layer are both curved surfaces that bulge away from the light-emitting chip.

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