Light source module and display device

Abstract

The invention discloses a light source module and a display device, the light source module comprises a plurality of light sources, the light sources comprise a first light source and a second light source, and the second light source is located on the periphery of the first light source; the lens is arranged on the light emitting side of the second light source; wherein the first light source is provided with a first central axis, the lens is provided with a second central axis, and an included angle is formed between the first central axis and the second central axis; pixel light sources on the periphery of the light source module can be converged, so that the definition of the edge in the light source direction is improved; in addition, the invention further discloses a display device which comprises the light source module, and the edge precision of the microLED displayer can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of display, and in particular to a light source module and a display device. Background Art

[0002] MicroLED light sources have the advantages of high brightness, low power consumption, long life and fast response time, and are very suitable for high-resolution display applications. Tiny light-emitting diodes (LEDs) are usually used as pixels. As the size of MicroLED light sources decreases, yield control becomes more difficult during the production process, and tiny defects can also cause pixel failure, affecting display clarity. Therefore, it is urgent to design a small-sized MicroLED light source that can ensure clear pixel boundaries. Summary of the invention

[0003] In view of this, the present application provides a light source module and a display device, aiming to provide a light source suitable for small-sized MicroLEDs that can ensure the clarity of pixel boundaries.

[0004] In a first aspect, an embodiment of the present application provides a light source module, including:

[0005] A plurality of light sources, the light sources comprising a first light source and a second light source, the second light source being located outside the first light source;

[0006] at least one lens, the lens being disposed on a light-emitting side of the second light source;

[0007] The first light source has a first central axis, the lens has a second central axis, and there is an angle between the first central axis and the second central axis.

[0008] An embodiment of the present application provides a light source module, including at least one lens, at least one lens is located on the periphery of a first light source, and the angle between the first central axis and the second central axis is an acute angle, which is used for edge pixel convergence, and is beneficial to adjust the brightness and chromaticity output of each pixel to achieve a more uniform display effect, thereby improving the clarity of the light source display.

[0009] Optionally, in some embodiments of the present application, the angle ranges from 0° to 90°.

[0010] Optionally, in some embodiments of the present application, the angle ranges from 30° to 60°.

[0011] Optionally, in some embodiments of the present application, a curvature change of a surface of the lens facing away from the second light source on a side close to the first light source is greater than a curvature change on a side facing away from the first light source.

[0012] Optionally, in some embodiments of the present application, an average height of the lens on a side close to the first light source is lower than an average height of the lens on a side away from the first light source.

[0013] Optionally, in some embodiments of the present application, the lens includes an asymmetric lens, and the asymmetric lens is asymmetrically arranged with respect to a normal direction of a light-emitting surface of the second light source.

[0014] Optionally, in some embodiments of the present application, the lens also includes a symmetrical lens, and the symmetrical lens is arranged on the light emitting side of the first light source; the curvature change of the asymmetrical lens close to the symmetrical lens is greater than the curvature change of the symmetrical lens.

[0015] Optionally, in some embodiments of the present application, the row direction is defined as a first direction, a plurality of the first light sources are arranged in at least one row along the first direction, and the second light source is located at one end or both ends of the first light source along the first direction.

[0016] Optionally, in some embodiments of the present application, when the second light source is located at both ends of the first light source along the first direction, the convergence directions of the two second light sources are opposite.

[0017] In a second aspect, an embodiment of the present application provides a display device, comprising the aforementioned light source module.

[0018] The embodiment of the present application provides a display device, which uses the light source module of the present application to help improve the high resolution, high brightness, high contrast, low power consumption and other characteristics of the display device.

[0019] The embodiments of the present application provide a light source suitable for small-sized MicroLEDs that can ensure pixel boundary clarity.

[0020] The light source module of the present application includes a second light source arranged around the first light source, and a lens is arranged on the light emitting side of the second light source, the lens has a second central axis, the first light source has a first central axis, and an angle is formed between the first central axis and the second central axis, so that the light emitting pixels of the second light source can converge, which is beneficial to improving the clarity of the light emitted by the light source module at the edge, that is, the edge of the light is clear and sharp, without blurring or diffusion. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 is a schematic structural diagram of the light source module along the y direction of Example 1 of the present application;

[0023] Figure 2 is a schematic structural diagram of the light source module along the x direction of Example 2 of the present application;

[0024] Figure 3 is a schematic structural diagram of the light source module along the y direction of Example 2 of the present application;

[0025] Figure 4 It is a schematic diagram for explaining the scanning direction and the light source direction when performing photocuring printing in an embodiment of the present application;

[0026] Figure 5 This is a comparison diagram of the cross-sectional morphology of printing after printing using Example 1-2 and a conventional pixel light source;

[0027] Figure 6 It is a schematic diagram of the illumination condition of the light source of the present application on the target surface;

[0028] Figure 7 It is a schematic diagram of the lens structure adjustment in the light source module of the present application.

[0029] Reference numerals:

[0030] 100. Light source;

[0031] 200, lens; 201, first lens; 202, second lens;

[0032] x, scanning direction; y, light source direction; a, photocuring material; b, optical axis; c, target surface; d, asymmetric lens; e, symmetric lens. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0035] In this application, unless otherwise stated, directional words such as "upper" and "lower" generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inner" and "outer" refer to the outline of the device. In addition, in the description of this application, the term "including" means "including but not limited to". The terms first, second, third, etc. are used only as labels and do not impose numerical requirements or establish an order.

[0036] In this application, "and / or" describes the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural.

[0037] In the present application, "at least one" means one or more, and "plurality" means two or more. "One or more", "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single items or plural items. For example, "at least one of a, b, or c", or "at least one of a, b, and c" can all mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be single or multiple, respectively.

[0038] In the present application, when a layer is formed "on" another layer, the so-called "on" is a broad concept, which may indicate that the formed another layer is adjacent to the certain layer, or may indicate that there are other spacing structural layers between the another layer and the certain layer. For example, when a second electrode is formed "on" the first carrier functional layer, the so-called "on" may indicate that the formed second electrode is adjacent to the first carrier functional layer, or may indicate that there are other spacing structural layers between the second electrode and the first carrier functional layer, such as a light-emitting layer.

[0039] Various embodiments of the present application may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be understood as a rigid limitation on the scope of the present application; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numerical values ​​within the range. For example, the range description from 1 to 6 should be considered to have specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which apply regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.

[0040] This application applies a lens to MicroLED, aiming to provide a light source suitable for small-sized MicroLED that can ensure the clarity of pixel boundaries.

[0041] In a first aspect, an embodiment of the present application provides a light source module, including:

[0042] substrate;

[0043] A plurality of light sources, the light sources may include a first light source and a second light source, the second light source is located outside the first light source;

[0044] at least one lens, the lens being arranged on a light-emitting side of the second light source;

[0045] The first light source has a first central axis; the lens has a second central axis, and an angle is formed between the first central axis and the second central axis.

[0046] The light source module provided in the embodiment of the present application has an angle formed between its first central axis and the second central axis, so that the light output pixels of the second light source can converge, which is beneficial to improving the clarity of the light emitted by the light source module at the edge, that is, the edge of the light is clear and sharp, without blurring or diffusion.

[0047] In some embodiments of the present application, the angle may range from 0° to 90°.

[0048] In some embodiments of the present application, the angle may range from 15° to 75°.

[0049] In some embodiments of the present application, the angle may range from 30° to 60°.

[0050] Exemplarily, the value of the angle can be any one of 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70° or a range between any two of the values.

[0051] In some embodiments of the present application, the first central axis may be emitted vertically, that is, the first central axis is emitted in the same direction as the substrate normal.

[0052] In some embodiments of the present application, the second central axis may be emitted at a certain angle to the substrate normal line, and an acute angle is formed between the second central axis and the first central axis.

[0053] It should be noted that the light emitting directions of the symmetrical lens and the asymmetrical lens are different. The symmetrical lens may emit light vertically, while the asymmetrical lens may emit light non-vertically.

[0054] In some embodiments of the present application, the lens has a light emitting surface and a light incident surface, the light incident surface is located on a side of the lens facing the first light source, and the light emitting surface is located on a side of the lens facing away from the first light source.

[0055] The second light source has a first physical center, and an angle between a line connecting the highest point of the light-emitting surface of the lens and the first physical center and a normal direction of the light-emitting surface of the second light source is 30° to 60°.

[0056] The highest point of the lens is located on the side away from the first light source in the plane direction of 90° to 270°, so that the edge pixel convergence of the light source module can be achieved.

[0057] In some embodiments of the present application, the curvature change of the surface of the lens facing away from the second light source on the side close to the first light source is greater than the curvature change on the side facing away from the first light source.

[0058] In some embodiments of the present application, in the symmetric direction of the normal line of the second light source, the curvature of the light emitting surface of the lens on the side close to the first light source is smaller than the curvature of the light emitting surface of the lens on the side away from the first light source.

[0059] In some embodiments of the present application, the average height of the lens on the side close to the first light source is lower than the average height of the lens on the side away from the first light source, thereby indicating that the height of the lens on the side close to the first light source is lower than the height of the lens on the side away from the first light source, so that the light source is emitted from the lens in the direction toward the first light source.

[0060] In some embodiments of the present application, the ratio of the height to the width of the asymmetric lens is (0.3-1):1.

[0061] In some embodiments of the present application, a ratio of the height to the width of the asymmetric lens is any one of 0.3:1, 0.4:1, 0.5:1, 0.6:1, 0.7:1, 0.8:1, 0.9:1, and 1:1.

[0062] It should be noted that the light source module is one of the key components of the display device, providing the display device with a light source with sufficient brightness and uniform distribution, and uniformizing the light of the light source through components such as the light guide plate and the diffuser to ensure clear display of the image. You can choose a suitable light source module according to different application requirements.

[0063] In some embodiments of the present application, the light source may include an LED light source or a microLED light source.

[0064] It should be noted that the light source in the present application refers to a sub-unit in a light source array, which may also be called a pixel light source or a light-emitting chip.

[0065] It should be noted that LED light sources can be used to provide continuous ultraviolet light or light of a specific wavelength. MicroLED light sources have higher pixel density, which can achieve smaller feature sizes and more complex geometric shapes. MicroLED light sources use tiny LEDs as light sources and can be controlled independently.

[0066] In some embodiments of the present application, the light source may be a plurality of sub-units arranged in an array along the light source direction and independent of each other, or a plurality of sub-units arranged continuously along the light source direction to form a column of light sources.

[0067] In some embodiments of the present application, the number of second light sources can be an odd number or an even number, and the odd number of second light sources are arranged on one side of the first light source, and the even number of second light sources are evenly distributed on both sides of the first light source, so that the output light of the second light sources converges toward the first light source.

[0068] In some embodiments of the present application, the number of lenses may be consistent with the number of second light sources, or may be inconsistent with the number of second light sources.

[0069] In some embodiments of the present application, the number of lenses is greater than or equal to half the number of the second light sources.

[0070] In some embodiments of the present application, the number of lenses can be an even number, which can be 10, 20, 40, 60, 80, 100, 120, 140 or any other even number. The even number of lenses are symmetrically arranged at the edge positions in the direction of the first light source to better achieve edge pixel convergence.

[0071] In some embodiments of the present application, the number of lenses may be any integer value between 1 and 10,000, or an integer value outside the range of 10,000. There is no specific limitation on the number of lenses.

[0072] In some embodiments of the present application, the lens and the second light source can be grown by chemical vapor deposition (CVD), and then an etching method is used to prepare the light source lens structure, thereby manufacturing a light source lens structure with high precision and complex geometry.

[0073] It should be noted that chemical vapor deposition (CVD) is used in the manufacture of light source lens structures. CVD can be used to generate thin films of specific materials, and then form the desired shape and structure through an etching process.

[0074] In some embodiments of the present application, the lens can be selected from a glass lens module or a super lens module.

[0075] It should be noted that the glass lens module uses glass material to manufacture lenses, which have high optical quality and durability, and are used to focus light sources and improve display clarity.

[0076] In some embodiments of the present application, multiple light source arrays are distributed in m rows and n columns, the m rows of light sources are located in the 0° to 180° plane direction of the lens, and the n columns of light sources are located in the 90° to 270° plane direction of the lens.

[0077] Correspondingly, the number of symmetrical lenses can be (m-2) rows and (n-2) columns, the (m-2) rows of symmetrical lenses are located in the 0° to 180° plane direction of the first light source, and the (n-2) columns of symmetrical lenses are located in the 90° to 270° plane direction of the first light source.

[0078] Correspondingly, the number of asymmetric lenses can be 2 rows and 2 columns, the 2 rows of asymmetric lenses are respectively arranged on the second light sources on both sides along the plane direction of 0° to 180°, and the 2 columns of asymmetric lenses are respectively arranged on the second light sources on both sides along the plane direction of 90° to 270°.

[0079] In some embodiments of the present application, m in the m row can be any integer value ≥ 3, and m can be any integer value between 3 and 10,000.

[0080] In some embodiments of the present application, m may be any integer value between 3 and 1000. m may be any integer value between 1 and 500. m may be any integer value between 10 and 200.

[0081] In some embodiments of the present application, n in the n column can be selected as any integer value ≥ 1, and n can be any integer value between 1-10000.

[0082] In some embodiments of the present application, n may be any integer value between 1 and 1000. Further optionally, n may be any integer value between 1 and 100. Further optionally, n may be any integer value between 1 and 10.

[0083] It should be noted that a symmetrical lens refers to a lens with the same or symmetrical characteristics in two dimensions, and this symmetry can be radial symmetry or mirror symmetry, that is, it is symmetrically arranged along the plane direction of 90° to 270° of the lens. An asymmetric lens refers to a lens whose shape is not mirror-symmetrical along the direction of its optical axis, that is, it is asymmetrically arranged along the plane direction of 90° to 270° of the lens.

[0084] In some embodiments of the present application, the lens may be a symmetrical lens to ensure that the light source propagates in a direction perpendicular to the optical axis of the lens after passing through the symmetrical lens. The lens may be an asymmetric lens to ensure that the light source propagates obliquely in a direction close to the first light source after passing through the asymmetric lens, so as to achieve edge pixel convergence of the light source module.

[0085] In some embodiments of the present application, the symmetrical lens may be a plane-convex lens, a hemispherical lens, a super lens, etc., to achieve vertical emission.

[0086] In some embodiments of the present application, the asymmetric lens can be selected as an aspheric lens, a free-form surface lens, a trapezoidal lens or a wedge-shaped lens, etc., and the shape is not particularly limited. It can achieve non-vertical emission and thus achieve edge pixel convergence of the light source module.

[0087] In a second aspect, the present application provides a display device, including a display panel and a backlight module, wherein the backlight module includes the aforementioned light source module. The aforementioned light source module can improve the display device's high resolution, high brightness, high contrast, and low power consumption.

[0088] It should be noted that the light source module of the present application can also be applied to photocuring printing technology, which uses photosensitive resin materials and solidifies them by irradiating ultraviolet light of a specific wavelength, thereby building a three-dimensional model layer by layer. Photocuring printing is also a 3D printing technology, which uses a light source of a specific wavelength (usually ultraviolet light) to cure liquid photosensitive resin to build a three-dimensional object layer by layer. This technology has the characteristics of high precision, smooth surface, rapid manufacturing, flexibility in printing product design, and diversity in the selection of materials, and can achieve a printing effect with both high precision and rich details.

[0089] The light source module of the present application is applied in the field of photocuring printing. It uses tiny light emitting diodes (LEDs) as pixels. Due to the size effect of the MicroLED light source, the requirements for 3D printing accuracy can be improved, but the printing efficiency will be very slow. Therefore, the size of the MicroLED light source is not easy to be too small, but if the size of the light source is increased, the printing accuracy will deteriorate. Using a light source module provided by the present application, the edge accuracy after printing can be optimized, and a high-power light source can be selected to ensure the advantages of both printing efficiency and printing accuracy.

[0090] The present application is described in detail below by means of specific examples, which are only partial examples of the present application and are not intended to limit the present application. The raw materials used in the following examples are all commercially available products unless otherwise specified.

[0091] refer to Figure 1 , Embodiment 1 of the present application discloses a light source module, comprising:

[0092] A plurality of light sources 100, wherein the light sources 100 include a first light source and a second light source, and the second light source is located outside the first light source;

[0093] At least one lens 200, the lens 200 is arranged on the light emitting side of the second light source;

[0094] The first light source has a first central axis, the lens has a second central axis, and the first central axis and the second central axis have an included angle of 30°.

[0095] The number of light sources 100 is 6, and the 6 light sources 100 are arranged in an array of 6 rows and 1 column;

[0096] The lens 200 includes two asymmetric lenses 201 and four symmetric lenses 202 . The asymmetric lenses 201 are located at the edge of the light source direction y, and the four symmetric lenses 202 are continuously arranged between the two asymmetric lenses 201 .

[0097] In this embodiment, the asymmetric lens 201 has a second central axis; the symmetric lens 202 has a third central axis, the light source 100 has a first central axis, the third central axis is arranged in the same direction as the first central axis, and the first central axis and the second central axis have an angle. In this embodiment, the angle is 30°.

[0098] Reference Figure 2 and Figure 3 , Embodiment 2 of the present application provides a light source module, including:

[0099] A plurality of light sources 100, wherein the light sources 100 include a first light source and a second light source, and the second light source is located outside the first light source;

[0100] At least one lens 200, the lens 200 is arranged on the light emitting side of the second light source;

[0101] The first light source has a first central axis; the lens 200 has a second central axis, and the first central axis and the second central axis have an included angle of 30°.

[0102] The number of light sources 100 is selected to be 3 columns, and the array of 3 columns of light sources 100 is distributed as 1 row and 3 columns;

[0103] The lens 200 includes two asymmetric lenses 201 and one symmetric lens 202 . The asymmetric lenses 201 are located at the edge of the light source direction y, and the symmetric lens 202 is located between the two asymmetric lenses 201 .

[0104] The asymmetric lens 201 is a row of lenses made of a plurality of lens sub-units. In this embodiment, refer to columns A and C. The first lens has a second central axis. The symmetric lens 202 is a row of lenses made of a plurality of lens sub-units. In this embodiment, refer to column B. The second lens is a symmetrical structure. The symmetric lens has a third central axis. The third central axis is arranged in the same direction as the first central axis. The first central axis and the second central axis have an angle. In this embodiment, the angle is 30°.

[0105] Reference Figure 4 , the photocurable material is 3D printed according to the set scanning direction and light source direction. In the figure, x is the scanning direction, which refers to the direction in which the print head moves on the printing platform; y is the light source direction, which refers to the layout direction of the light source relative to the printing platform; a is the photocurable material, that is, the photosensitive resin.

[0106] Reference Figure 5 , shows the printed cross-sectional morphology of Examples 1-2 and conventional pixel light sources. At a printing boundary of 50 μm, the pixel light source of Example 2 is used for printing, and the height after printing is 0.39 μm, while the conventional pixel light source is used for printing, and the height after printing is 0.58 μm. The printing height is reduced by 33%, which significantly improves the printing accuracy.

[0107] It should be noted that, refer to Figure 6 and Figure 7 In an optical system, to achieve the offset of the optical axis b and change the propagation direction or distribution of the light source 100, especially when the target surface c and the normal line of the light source 100 need to be offset when the light source 100 is irradiated, an asymmetric lens d can be used on the light source 100 to replace the symmetric lens e, so that the light will be offset after passing through the asymmetric lens d. In addition to the asymmetric lens d, the lens can also be installed at a certain angle. In this case, the light source will not propagate perpendicular to the normal line of the lens after passing through the lens, but will be offset at a certain angle.

[0108] The light source module and the display device provided in the embodiments of the present application are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A light source module, characterized in that: include: A plurality of light sources, the light sources comprising a first light source and a second light source, the second light source being located outside the first light source; at least one lens, the lens being disposed on a light-emitting side of the second light source; The first light source has a first central axis, the lens has a second central axis, and there is an angle between the first central axis and the second central axis.

2. The light source module according to claim 1, characterized in that: The angle ranges from 0° to 90°.

3. The light source module according to claim 2, characterized in that: The angle ranges from 30° to 60°.

4. The light source module according to claim 1, characterized in that: The curvature change of the surface of the lens facing away from the second light source on the side close to the first light source is greater than the curvature change on the side facing away from the first light source.

5. The light source module according to claim 1, characterized in that: An average height of the lens at a side close to the first light source is lower than an average height of the lens at a side away from the first light source.

6. The light source module according to claim 1, characterized in that: The lens comprises an asymmetric lens, and the asymmetric lens is asymmetrically arranged with respect to a normal direction of a light emitting surface of the second light source.

7. The light source module according to claim 6, characterized in that: The lens further comprises a symmetrical lens, and the symmetrical lens is arranged on the light emitting side of the first light source; the curvature change of the asymmetrical lens on the side close to the symmetrical lens is greater than the curvature change of the symmetrical lens.

8. The light source module according to claim 1, characterized in that: The row direction is defined as a first direction, a plurality of the first light sources are arranged in at least one row along the first direction, and the second light source is located at one end or both ends of the first light source along the first direction.

9. The light source module according to claim 8, characterized in that: When the second light sources are located at two end positions of the first light source along the first direction, the convergence directions of the two second light sources are opposite.

10. A display device, characterized in that: A light source module comprising any one of claims 1 to 9.

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