Optical lens, light-emitting module, display screen and method for improving pixel density

Abstract

The invention discloses an optical lens, a light-emitting module, a display screen and a method for improving pixel density, and the optical lens comprises a refraction layer and a scattering layer. The refraction layer comprises a light emitting surface and a light shaping surface which are oppositely arranged; the scattering layer is arranged on one side of the light-emitting surface; wherein the light shaping surface is formed by arranging a plurality of minimum repetitive units in a transverse and longitudinal array manner; each minimum repeating unit is integrally recessed inwards and comprises a shading area and a plurality of light collecting areas; the plurality of light collecting areas are dispersed in the sunken area to form a Fresnel lens structure; the light shielding area and the plurality of light collecting areas split incident light to obtain a plurality of sub-light beams, the sub-light beams penetrate through the refraction layer and are emitted through the light emitting face, the sub-light beams are re-emitted through the scattering layer, and a plurality of light emitting areas are formed on the side, away from the refraction layer, of the surface of the scattering layer. The LED module is covered with the innovative optical lens, the light emitted by the single LED lamp bead is divided into multiple parts according to the light refraction principle, and the purpose of improving display pixels is achieved.

Description

Technical Field

[0001] The present application relates to the field of LED display screen design, and more specifically, to an optical lens, a light-emitting module, a display screen, and a method for improving pixel density. Background Art

[0002] With the rapid development of LED lamp bead (light emitting diode) technology, display screens made of LED are increasingly widely used in various display occasions. LED display screens rely on independent self-luminous LED components to display the picture. To a large extent, the size of a single LED light-emitting component determines the size of the display pixel and the display effect of the final spliced ​​image.

[0003] With the advancement of technology, the size of LED lamp beads is getting smaller and smaller, from a few millimeters to a few tenths of a millimeter now. The smaller and smaller size of LED lamp beads has put forward higher requirements for making smaller size LED lamp beads in the future. Any substance in the physical world will reach its limit. Summary of the invention

[0004] In order to solve the technical problem that a single LED lamp bead is too large to meet the higher requirements of pixels, the present application provides an optical lens, a light-emitting module, a display screen and a method for increasing pixel density. By covering the LED module with an innovative optical lens and using the principle of light refraction, the light emitted by a single LED lamp bead is divided into multiple parts to achieve the purpose of increasing display pixels.

[0005] Specifically, the technical solution of this application is as follows:

[0006] In a first aspect, the present application discloses an optical lens, comprising a refractive layer and a scattering layer;

[0007] The refractive layer comprises a light emitting surface and a light shaping surface which are arranged opposite to each other; the scattering layer is arranged on one side of the light emitting surface;

[0008] The light shaping surface is composed of a plurality of minimum repeating units arranged in a horizontal and vertical array; each of the minimum repeating units is concave as a whole toward a side close to the light emitting surface, including a light shielding area and a plurality of light collecting areas; the plurality of light collecting areas are dispersed in the concave area to form a Fresnel lens structure;

[0009] The shading area and the plurality of light collecting areas split the incident light to obtain a plurality of sub-beams which are emitted through the refraction layer via the light emitting surface and re-emitted through the scattering layer, forming a plurality of light emitting areas on the side of the scattering layer surface away from the refraction layer.

[0010] In some embodiments, the surface of the light collection area is convex; light entering the light collection area is refracted and converges in a specified direction;

[0011] The shading area is a multi-sawtooth diamond structure, and the incident light is reflected at a large angle in the shading area, so that the light cannot pass through the shading area; the shading area separates the light collecting area from other light collecting areas.

[0012] In some embodiments, the scattering layer is a light scattering material, which includes light scattering particles, so that the sub-beam is scattered after entering the scattering layer.

[0013] In some embodiments, the light collection area includes: a first light collection area, a boundary line of the first light collection area is parallel to the light emitting surface;

[0014] A second light collection area, wherein a boundary line of the second light collection area has a certain inclination angle with the light emitting surface.

[0015] In some embodiments, the design parameters of each light-collecting region in the minimum repeating unit affect the beam splitting effect of the incident light;

[0016] The design parameters include the number, position, size, and inclination angle of the light collection area in the minimum repeating unit;

[0017] The beam splitting effect includes the number of the sub-beams obtained by beam splitting, the position of the light spot projected on the light emitting surface, and the size of the light spot.

[0018] In some embodiments, a first sub-beam converged by one light collecting area and a second sub-beam converged by another light collecting area intersect at a spot position projected on the light emitting surface, and the first sub-beam and the second sub-beam form the same light emitting area on the surface of the scattering layer.

[0019] In a second aspect, the present application further discloses a light-emitting module, comprising at least an optical lens as described in any one of the above embodiments, and further comprising a substrate and a plurality of LED lamp beads;

[0020] The LED lamp beads are arranged in a horizontal and vertical array and welded on the substrate;

[0021] The optical lens covers the upper layer of the LED lamp beads and is fixedly connected to the substrate.

[0022] In some embodiments, the arrangement of the LED lamp beads is the same as the arrangement of the minimum repeating unit in the optical lens; one LED lamp bead corresponds to one minimum repeating unit;

[0023] The minimum repeating unit is used to split the incident light provided by the LED lamp bead.

[0024] In a third aspect, the present application further discloses an LED display screen, comprising a light-emitting module as described in any one of the above embodiments, and further comprising: at least one control circuit;

[0025] The at least one control circuit is used to control the light-emitting module.

[0026] In a fourth aspect, the present application further discloses a method for improving the pixel density of a display screen, wherein the method is implemented based on an optical lens described in any one of the above embodiments, and comprises:

[0027] By setting the design parameters of each light-collecting area in the minimum repeating unit, the beam splitting effect of the incident light is changed; the design parameters include the number, position, size, and inclination angle of the light-collecting area in the minimum repeating unit; the beam splitting effect includes the number of the sub-beams obtained by beam splitting, the position and size of the light spot projected on the light-emitting surface;

[0028] The designed optical lens is used to cover the light-emitting module to split the incident light generated by the light-emitting module.

[0029] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0030] 1. The optical lens of this application can realize the beam splitting of incident light. Through the special design angle of the minimum repeating unit concave and the light collecting area, the incoming light changes its direction, gathers or shields according to the angle designed by the Fresnel lens. Finally, the light reaches the scattering layer through the refraction layer. By setting appropriate design parameters of the light collecting area, an ideal beam splitting effect can be obtained.

[0031] 2. By using the optical lens of the present application, the purpose of increasing the pixel density of the LED display screen can be achieved. On the basis of the original LED lamp beads, a special optical lens is covered on the module composed of LED lamp beads. Through the principle of light wave refraction, the light emitted by a single LED lamp bead is divided into multiple parts, which are refracted to the scattering layer respectively to display multiple light-emitting points. The division realizes smaller pixel points and more pixel points to achieve the purpose of increasing the display pixel density. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The preferred implementation scheme will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present application.

[0033] Figure 1 A schematic structural diagram of an embodiment of an optical lens of the present application is shown;

[0034] Figure 2A schematic diagram of a side-cut structure of a minimum repeating unit in an embodiment of an optical lens in the present application is shown;

[0035] Figure 3 A schematic diagram of a side-cut structure of another minimum repeating unit in an embodiment of an optical lens in the present application is shown;

[0036] Figure 4 A top view of a minimum repeating unit and a corresponding light spot effect diagram in one embodiment of the present application;

[0037] Figure 5 A top view of a minimum repeating unit and a corresponding light spot effect diagram in another embodiment of the present application;

[0038] Figure 6 A top view of a minimum repeating unit and a corresponding light spot effect diagram in another embodiment of the present application;

[0039] Figure 7 A top view of a minimum repeating unit and a corresponding light spot effect diagram in another embodiment of the present application;

[0040] Figure 8 A schematic structural diagram of a light-emitting module in the prior art is shown;

[0041] Fig. 9 A schematic diagram of the structure of a light-emitting module disclosed in the application is shown;

[0042] Fig.10 A schematic diagram illustrating the light-emitting area effect produced by a 4×4 LED lamp bead module before and after being covered with the optical lens of the present application. DETAILED DESCRIPTION

[0043] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0044] It should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of the described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections.

[0045] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0046] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0047] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0048] In a specific implementation, the terminal device described in the embodiments of the present application includes, but is not limited to, other portable devices such as mobile phones, laptop computers, tutoring machines, or tablet computers with touch-sensitive surfaces (e.g., touch screen displays and / or touch pads). It should also be understood that in some embodiments, the terminal device is not a portable communication device, but a desktop computer with a touch-sensitive surface (e.g., touch screen displays and / or touch pads).

[0049] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the specific implementation methods of the present application will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0050] With the rapid development of LED lamp bead (light emitting diode) technology, display screens made of LED are increasingly widely used in various display occasions. LED display screens rely on independent self-luminous LED components to display the picture. To a large extent, the size of a single LED light-emitting component determines the size of the display pixel and the display effect of the final spliced ​​image.

[0051] With the advancement of technology, the size of LED lamp beads is getting smaller and smaller, from a few millimeters to a few tenths of a millimeter now. The smaller and smaller size of LED lamp beads has put forward higher requirements for making smaller size LED lamp beads in the future. Any substance in the physical world will reach its limit.

[0052] In the field of LED display screens, each LED lamp bead represents a display pixel. With the mass production of small-sized LED lamp beads, it plays a key role in promoting the development of LED display screens. LED display screens display images by welding a large number of LED lamp beads arranged in a spliced ​​manner on the PCB board to realize the display of images. In the past, when the LED lamp beads were larger than 5MM, due to the large size of a single LED lamp bead and the limited number of LED lamp beads arranged per unit area, the overall display screen would appear large granular, which can also be called a mosaic screen. The display effect can only be a simple picture such as a letter banner. In recent years, the technological progress of LED light-emitting diodes, especially the emergence of lamp beads within 1MM, has brought qualitative development to the LED display industry. As customers' requirements for display continue to increase, the production of smaller lamp beads is becoming more and more urgent. However, the production of smaller-sized LED lamp beads places higher demands on technology, which is bound to double the production cost.

[0053] The present invention achieves the purpose of increasing the display pixel by covering the surface of an LED module composed of spliced ​​and arranged LED lamp beads with an innovative optical lens, and dividing the light emitted by a single LED lamp bead into multiple parts through the principle of light wave refraction. For example, when the size of the LED lamp bead is 1MM, 1MM can be divided into 0.5MM display effects through light splitting and refraction. This is equivalent to doubling the display pixel points to achieve a method of increasing pixel density and improving the display effect.

[0054] The optical lens in this application is further described below by way of specific embodiments. This application discloses an embodiment of an optical lens. Figure 1 , Figure 1 The schematic diagram of the structure of an embodiment of an optical lens of the present application is shown. The optical lens includes a refractive layer 200 and a scattering layer 100;

[0055] The refraction layer 200 includes a light emitting surface 210 and a light shaping surface 220 which are disposed opposite to each other. The scattering layer 100 is disposed on one side of the light emitting surface 210 .

[0056] The light shaping surface 220 is composed of a plurality of minimum repeating units 230 arranged in a horizontal and vertical array; each of the minimum repeating units is concave toward a side close to the light emitting surface 210 as a whole, and the concave area is attached Figure 1 The shaded portion 231 is shown.

[0057] Single minimum repeating unit, refer to the instruction manual Figure 2 shown. Figure 2 The schematic diagram of the side-cut structure of a minimum repeating unit in the embodiment of the optical lens in the present application is shown. The recessed area includes a light-shielding area 221 and a plurality of light-collecting areas 222; the plurality of light-collecting areas 222 are dispersed in the recessed area to form a Fresnel lens structure.

[0058] The shading area 221 and the plurality of light collecting areas 222 split the incident light to obtain a plurality of sub-beams which are emitted through the refractive layer via the light emitting surface and re-emitted through the scattering layer, forming a plurality of light emitting areas 110 on the side of the scattering layer 100 away from the refractive layer.

[0059] Reference Manual Attached Figure 2 , the light source 310 is a VCSEL (vertical cavity surface emitting laser) laser chip, or an LED (light emitting diode) lamp bead, or other light emitting structure. The light emitted by the light source 310 is refracted and transmitted in the light collecting area, and is reflected or absorbed in the light shielding area, and finally forms a beam splitting effect. Specific visible light path 001 is shown.

[0060] The scattering layer is a light scattering material and includes light scattering particles, so that the sub-beams are scattered after entering the scattering layer.

[0061] Specifically, light-scattering materials refer to materials that can scatter light. They change the propagation direction of light through the internal structure of the material or by adding specific particles, thereby scattering light. The light-scattering particles in the light-scattering material can re-emit the light waves in all directions when the light waves pass through the material, so that the light has a very high contrast on the surface of the material and presents a low color difference effect when viewed from different angles. Light-scattering particles refer to particles that can scatter light waves when they pass through.

[0062] Another embodiment of an optical lens of the present application is shown in the attached specification. Figure 2 As shown, based on an embodiment of the above method, the surface of the light-collecting area is convex; the light entering the light-collecting area is refracted and converges in a specified direction.

[0063] The shading area is a multi-sawtooth diamond structure, and the incident light is reflected at a large angle in the shading area, so that the light cannot pass through the shading area; the shading area separates the light collecting area from other light collecting areas.

[0064] Specifically, the boundary of the light-collecting area is the boundary where the light-collecting area and the light-shielding area meet; due to the special design of the light-shielding area, after light enters the light-shielding area, it is reflected to the left and right directions and cannot penetrate the optical lens, thus forming a light-shielding effect.

[0065] A single light-collecting area is a convex lens structure, and the surface of the light-collecting area bulges outward (toward the concave area); the bulge degree of the light-collecting area, that is, the size of its curvature radius, has a significant effect on the refraction effect of light. The greater the bulge degree, the greater the refraction angle of light when passing through the lens. This means that the light bends more inside the lens, and thus converges closer to the center line on the other side of the lens. Therefore, when designing a lens, it is necessary to select a suitable curvature radius based on the specific light spot requirements to obtain the best convergence effect.

[0066] The combination of multiple light-collecting areas forms a structure similar to a Fresnel lens. The combination of multiple discontinuous lenses (light-collecting areas) together plays a role in light convergence. Multiple light-collecting areas are evenly distributed on the concave light-collecting shaping surface to form a concave area that is approximately arc-shaped. Not all light-collecting areas are parallel to the light-emitting surface.

[0067] Optionally, the light collection area includes: a first light collection area, the boundary line of the first light collection area is parallel to the light emitting surface; a second light collection area, the boundary line of the second light collection area is at a certain inclination angle to the light emitting surface. Figure 2 , where the boundary line of the light-collecting area at the center of the smallest repeating unit is parallel to the light-emitting surface; the boundary lines of the light-collecting areas on both sides are not parallel to the light-emitting surface and have a certain inclination angle. In addition, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0068] Fresnel lens, also known as spiral lens. One side of the lens surface of the Fresnel lens is smooth, and the other side is engraved with concentric circles from small to large. Its lines are designed based on the interference and perturbation of light and the requirements of relative sensitivity and receiving angle. The Fresnel lens has a lens-like function, which can converge the light emitted by the light source and change the angle of light refraction. In this application, the angle of the light collecting area affects the position of the light spot. Therefore, it is necessary to set a suitable angle according to the specific light spot requirements to obtain the best convergence effect.

[0069] Another embodiment of an optical lens of the present application is shown in the attached specification. Figure 3 As shown, Figure 3 A schematic diagram of the side-cut structure of another minimum repeating unit in an embodiment of the optical lens in the present application is shown. Figure 3 and Figure 2 The number of light collecting areas and the focusing angle are different, so the light spots produced are also different.

[0070] It can be seen that the design parameters of each light collecting area in the minimum repeating unit affect the beam splitting effect of the incident light.

[0071] The design parameters include the number, position, size, and inclination angle of the light collection area in the minimum repeating unit. The beam splitting effect includes the number of the sub-beams obtained by beam splitting, the position of the light spot projected on the light output surface, and the size of the light spot. Optionally, in actual applications, the design parameters of the light collection area should be set based on the ideal beam splitting effect.

[0072] For other embodiments of an optical lens of the present application, please refer to the attached specification. Figure 4-7 As shown, Figure 4-7 In the figure, the left side is a top view of a minimum repeating unit, in which the circles or ellipses represent the distribution of each light-collecting area. Figure 4-7 In the figure, the right side is a schematic diagram of a light spot generated when incident light passes through the corresponding minimum repeating unit and is projected onto the light emitting surface.

[0073] In other embodiments, the shape of the light collection area can also be set to a rectangle, a polygon, or other irregular shapes. It does not have to be a circle. The shape of the corresponding light spot can also be set to a rectangle, a polygon, or other irregular shapes. This is not specifically limited in this embodiment.

[0074] Reference Manual Attached Figure 4 As shown, it can be seen from the top view of the minimum repeating unit on the left that the number of light-collecting areas included in the figure is 5, among which the boundary line of the middle light-collecting area is parallel to the light-emitting surface, and the four light-collecting areas around it are inclined. The light passes through the light-collecting area and leaves 5 light spots on the light-emitting surface corresponding to the minimum repeating unit. The surrounding 4 light spots are not complete in the light-emitting surface area corresponding to the minimum repeating unit, and will intersect or overlap with a light spot generated by the adjacent minimum repeating unit. That is, the first sub-beam obtained by the splitting of the minimum repeating unit and the second sub-beam obtained by the splitting of the adjacent minimum repeating unit form the same light-emitting area on the surface of the scattering layer.

[0075] Reference Manual Attached Figure 5 As shown, Figure 5 In the example, the number of light-collecting areas is 4, and the two-dimensional images formed by the boundaries of these light-collecting areas are parallel to the light-emitting surface. The light passes through the light-collecting area and leaves 4 light spots on the light-emitting surface corresponding to the minimum repeating unit. The light spots are independent of each other and do not intersect or overlap with other light spots. Correspondingly, the sub-beams pass through the refractive layer and emit through the light-emitting surface to form light spots, and are re-emitted through the scattering layer, forming 4 light-emitting areas on the side of the scattering layer surface away from the refractive layer.

[0076] Reference Manual Attached Figure 6 As shown, Figure 6 In this example, the number of light collecting areas is 4, and the distribution of the light collecting areas is different. By adjusting the design parameters of the light collecting areas, the ideal light spot distribution can be achieved. Figure 6As shown, the partial light spot generated in a single minimum repeating unit is incomplete and will intersect or repeat with the light spot position generated by the adjacent minimum repeating unit. That is, the first sub-beam obtained by the beam splitting of the minimum repeating unit and the second sub-beam obtained by the beam splitting of the adjacent minimum repeating unit form the same luminous area on the surface of the scattering layer.

[0077] Reference Manual Attached Figure 7 As shown, Figure 7 In the example, the number of light-collecting areas is 2, and the size, protrusion degree (curvature radius), position, inclination angle, etc. of the light-collecting area will affect the generated light spot. Figure 7 Although the inclination angles of the two light-collecting areas are different, resulting in different shapes of their boundary lines, similar or identical light spot effects can be achieved by adjusting other design parameters such as size, protrusion degree (curvature radius), position, etc.

[0078] In other embodiments, a first sub-beam obtained by converging a light collection area and a second sub-beam obtained by converging another light collection area intersect at the light spot position of the light emitting surface, and the first sub-beam and the second sub-beam form the same light emitting area on the surface of the scattering layer. It is also possible that this occurs in the same minimum repeating unit.

[0079] The above embodiments are merely illustrative of the structure and effect of a minimum repeating unit of the optical lens of the present application, and do not represent all implementation methods of the present application. Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

[0080] Based on the same technical concept, the present application also discloses a light-emitting module, comprising at least one optical lens as described in any one of the above embodiments, and also comprising a substrate and a plurality of LED lamp beads. The plurality of LED lamp beads are arranged in a horizontal and vertical array and welded on the substrate. The optical lens covers the upper layer of the LED lamp beads and is fixedly connected to the substrate.

[0081] Optionally, the arrangement of the LED lamp beads is the same as the arrangement of the minimum repeating unit in the optical lens; one LED lamp bead corresponds to one minimum repeating unit;

[0082] The minimum repeating unit is used to split the incident light provided by the LED lamp bead.

[0083] Specifically, LED lamp beads are the smallest light-emitting units on a display screen, usually composed of one or more light-emitting diodes, which can emit monochromatic light such as red, green, and blue. Each LED lamp bead can be controlled independently, and its brightness can be changed by adjusting the current, thereby changing the color and brightness of the pixel. The pixel density (PPI, pixels per inch) of a display screen is determined by the size of each pixel and the size of the display screen. The smaller the pixel, the more pixels the display screen can display, and the clearer the image. The resolution of a display screen refers to the number of pixels in the horizontal and vertical directions. The higher the resolution, the more delicate the image displayed. A pixel on an LED display screen is composed of multiple LED lamp beads, which work together to display an image. The brightness and color of each LED lamp bead can be controlled independently to achieve a colorful display effect.

[0084] LED lamp beads are arranged in horizontal and vertical rules and are soldered on the PCB board by the SMT machine. A PCB board full of LED lamp beads is called an LED display module. The PCB board is the carrier of electrical components and the control circuit substrate. Figure 8 As shown, Figure 8 The schematic diagram of the structure of the light-emitting module in the prior art is shown. It can be seen from the figure that, generally speaking, one LED lamp bead 300 will generate one light-emitting area 111 .

[0085] Reference Manual Attached Fig. 9 , Fig. 9 The schematic diagram of the structure of a light-emitting module disclosed in the application is shown. Among them, on the basis of the LED lamp bead 300 and the PCB substrate 400, an optical lens described in any of the above embodiments is also covered. After covering the layer, the optical lens refracts the light emitted by the LED lamp bead, so that the light generated by a single LED lamp bead is divided into multiple light beams through the control of the refraction angle of the specially designed optical lens, and the multiple light beams are respectively displayed on the imaging layer to achieve the purpose of improving the display pixel density. After passing through the refraction layer 200 and the scattering layer 100 of the optical lens, the light generated by the LED lamp bead 300 is divided into multiple sub-beams, and multiple light-emitting areas 112 are formed on the side of the scattering layer surface away from the refraction layer.

[0086] Comparison manual attached Figure 8 And the instruction manual Fig. 9 After covering the optical lens, the light-emitting area 112 generated by the optical module is more in number and smaller in size than the light-emitting area 111 generated when the optical lens is not covered. When used as an LED display screen, the size of the pixel can be effectively reduced, thereby achieving the purpose of increasing the pixel of the LED display screen.

[0087] The final luminous area effect is as follows Fig.10 shown. Fig.10A schematic diagram of the light-emitting area effect produced by a 4×4 LED lamp bead module before and after being covered with the optical lens of the present application is shown. Fig.10 The left side covers the front of the optical lens of the present application, and the right side covers the back of the optical lens of the present application. It can be seen that the effect of increasing pixel density is obvious. For the convenience of illustration, the luminous area in the figure is represented by a white circle. In reality, it is generally a circle with blurred edges or a square structure with blurred edges, which is determined by the production process of LED lamp beads.

[0088] Based on the same technical concept, the present application also discloses an LED display screen, including a light-emitting module as described in any one of the above embodiments, and also including: at least one control circuit; the at least one control circuit is used to control the light-emitting module. Optionally, the LED display screen disclosed in this embodiment also includes: a drive circuit, a power module, a housing, and peripherals, etc. These components work together to ensure that the LED display screen can work normally and display the required information and images.

[0089] Based on the same technical concept, the present application also discloses a method for improving the pixel density of a display screen, and the implementation of the method is based on an optical lens described in any one of the above embodiments. Specifically, an embodiment of a method for improving the pixel density of a display screen of the present application includes:

[0090] S1. By setting the design parameters of each light-collecting area in the minimum repeating unit, the beam splitting effect of the incident light is changed; the design parameters include the number, position, size, and inclination angle of the light-collecting areas in the minimum repeating unit; the beam splitting effect includes the number of sub-beams obtained by beam splitting, the position of the light spot projected on the light-emitting surface, and the size of the light spot.

[0091] S2. Use the designed optical lens to cover the light-emitting module to split the incident light generated by the light-emitting module.

[0092] An optical lens, a light-emitting module, a display screen and a method for improving pixel density of the present application have the same technical concept, and the technical details of the embodiments of the two are applicable to each other. In order to reduce repetition, they will not be repeated here.

[0093] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, only the division of the above-mentioned program modules is used as an example for illustration. In actual applications, the above-mentioned functions can be assigned to different program modules as needed, that is, the internal structure of the device can be divided into different program units or modules to complete all or part of the functions described above. The program modules in the embodiment can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into a processing unit, and the above-mentioned integrated unit can be implemented in the form of hardware or in the form of software program units. In addition, the specific names of the program modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application.

[0094] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

Claims

1. An optical lens, characterized in that: including a refractive layer and a scattering layer; The refractive layer comprises a light emitting surface and a light shaping surface which are arranged opposite to each other; the scattering layer is arranged on one side of the light emitting surface; The light shaping surface is composed of a plurality of minimum repeating units arranged in a horizontal and vertical array; each of the minimum repeating units is concave as a whole toward a side close to the light emitting surface, including a light shielding area and a plurality of light collecting areas; the plurality of light collecting areas are dispersed in the concave area to form a Fresnel lens structure; The shading area and the plurality of light collecting areas split the incident light to obtain a plurality of sub-beams which are emitted through the refraction layer via the light emitting surface and re-emitted through the scattering layer, forming a plurality of light emitting areas on the surface of the scattering layer away from the refraction layer.

2. An optical lens as claimed in claim 1, characterized in that: The surface of the light collection area is a convex surface; light entering the light collection area is refracted and converges in a specified direction; The shading area is a multi-sawtooth diamond structure, and the incident light is reflected at a large angle in the shading area, so that the light cannot pass through the shading area; The light-shielding area separates the light-collecting area from other light-collecting areas.

3. An optical lens as claimed in claim 1, characterized in that: The scattering layer is a light scattering material; It includes light scattering particles, so that the sub-beams are scattered after entering the scattering layer.

4. An optical lens as claimed in claim 2, characterized in that: The light collecting area comprises: a first light collection area, wherein a boundary line of the first light collection area is parallel to the light emitting surface; A second light collection area, wherein a boundary line of the second light collection area has a certain inclination angle with the light emitting surface.

5. An optical lens according to any one of claims 1 to 4, characterized in that: The design parameters of each light-collecting area in the minimum repeating unit affect the beam splitting effect of the incident light; The design parameters include the number, position, size, and inclination angle of the light collection area in the minimum repeating unit; The beam splitting effect includes the number of the sub-beams obtained by beam splitting, the position of the light spot projected on the light emitting surface, and the size of the light spot.

6. An optical lens as claimed in claim 5, characterized in that: include: A first sub-beam converged by one light collecting area and a second sub-beam converged by another light collecting area intersect at the spot position of the light emitting surface, and the first sub-beam and the second sub-beam form the same light emitting area on the surface of the scattering layer.

7. A light emitting module, characterized in that: At least one optical lens according to any one of claims 1 to 6, further comprising a substrate and a plurality of LED lamp beads; The LED lamp beads are arranged in a horizontal and vertical array and welded on the substrate; The optical lens covers the upper layer of the LED lamp beads and is fixedly connected to the substrate.

8. A light emitting module as claimed in claim 7, characterized in that: include: The arrangement of the LED lamp beads is the same as the arrangement of the minimum repeating units in the optical lens; One of the LED lamp beads corresponds to one of the minimum repeating units; The minimum repeating unit is used to split the incident light provided by the LED lamp bead.

9. An LED display screen, characterized in that: A light-emitting module comprising any one of claims 7 to 8, further comprising: at least one control circuit; The at least one control circuit is used to control the light-emitting module.

10. A method for increasing the pixel density of a display screen, characterized in that: The method is implemented based on an optical lens according to any one of claims 1 to 6, comprising: By setting the design parameters of each light-collecting area in the minimum repeating unit, the beam splitting effect of the incident light is changed; the design parameters include the number, position, size, and inclination angle of the light-collecting area in the minimum repeating unit; the beam splitting effect includes the number of the sub-beams obtained by beam splitting, the position and size of the light spot projected on the light-emitting surface; The designed optical lens is used to cover the light-emitting module to split the incident light generated by the light-emitting module.

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