Isotropic LED lamp bead, LED display system, and movie screen

Abstract

Disclosed in the present invention is an isotropic LED lamp bead, comprising: light-emitting chips, a lamp bead support, a packaging colloid, and a lampshade, which is arranged above the packaging colloid. The light-emitting chips are electrically connected to the lamp bead support. A light-transmitting colloid is provided in a covering manner inside the packaging colloid and above the light-emitting chip, and a smooth arc surface which is recessed downwards is formed on the light-transmitting colloid. The lampshade is arranged in a covering manner above the packaging colloid, and is provided with a protruding light-diffusion portion. An inner surface of the light-diffusion portion is a smooth arc surface, and a refractive cavity is formed between the inner surface of the light-diffusion portion and an upper surface of the light-transmitting colloid. The lampshade can convert an original point light source of the lamp bead into a surface light source, thereby effectively expanding the light-emitting angle of the lamp bead, such that the color does not deviate when the lamp bead is viewed from all directions. Further disclosed in the present invention are an LED display system and a movie screen, above each of which the isotropic LED lamp bead is mounted. The sense of reality of environmental simulation of the LED display system is effectively improved, and the viewing effect of the movie screen is also improved.

Description

Isotropic LED lamp beads, LED display systems and movie screens Technical Field

[0001] The present invention belongs to the technical field of LED display, and in particular relates to an isotropic LED lamp bead, an LED display system and a movie screen. Background Art

[0002] LED display systems are currently widely used in virtual photography. In virtual studios, the demands for high-quality photography are high. Beyond meeting standard performance requirements, even higher standards, such as frame rate and color, must be met. However, existing technologies often create discrepancies in the color display when capturing the same image from different angles across multiple LED displays, impacting the realism of the simulated environment. This color temperature shift at wide angles is closely related to the display's internal design, specifically the design of the LEDs. When the human eye looks directly at the LEDs, it perceives the correct color. However, as the angle of observation decreases, approaching horizontal, blind spots or blind spots appear, resulting in color deviations. This color deviation occurs when light from one or two of the light-emitting cores is blocked, preventing the human eye from fully perceiving the three colors. This applies to both individual LEDs and the entire display. Traditional LED manufacturing methods alone are unable to fundamentally address this issue.

[0003] Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an isotropic LED lamp bead, an LED display system and a movie screen, so as to solve the problem in the prior art that the lamp beads in the screen have color deviation when viewed from different angles during the direct display process.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is to provide an isotropic LED lamp bead, including a light-emitting chip, a lamp bead bracket, a packaging body and a lampshade arranged above the packaging body; the number of the light-emitting chips is multiple, and the light-emitting chip is arranged above the lamp bead bracket, and the light-emitting chip is electrically connected to the lamp bead bracket; the lamp bead bracket is arranged inside the packaging body; the interior of the packaging body and the top of the light-emitting chip are covered with a light-transmitting colloid, and the light-transmitting colloid is formed with a smooth arc surface that is concave downward; the lampshade covers the top of the packaging body, and the lampshade has a protruding light-expanding portion, which extends in a direction away from the packaging body, and the inner surface of the light-expanding portion is a smooth arc surface, and a refractive cavity is formed between the inner surface of the light-expanding portion and the upper surface of the light-transmitting colloid.

[0006] In some embodiments, a cross-sectional dimension of the light expansion portion gradually decreases in a direction away from the encapsulant.

[0007] In some embodiments, the lamp bead bracket includes an anode bracket and a cathode bracket, and the number of the cathode brackets corresponds to the number of the light-emitting chips; the bottom surface of the light-emitting chip is fixed to the upper surface of the anode bracket through a conductive colloid, and a wire is connected between the upper surface of the light-emitting chip and the cathode bracket.

[0008] In some embodiments, the light expanding portion includes a first curved surface and a second curved surface, and a horizontal plane where the first curved surface and the light-transmitting colloid are in contact is a reference plane.

[0009] In some embodiments, the vertical distance from the vertex of the first curved surface to the reference plane is equal to the vertical distance from the vertex of the curved surface on the upper surface of the light-transmitting colloid to the reference plane; or, the vertical distance from the vertex of the first curved surface to the reference plane is less than the vertical distance from the vertex of the curved surface on the upper surface of the light-transmitting colloid to the reference plane; or, the vertical distance from the vertex of the first curved surface to the reference plane is greater than the vertical distance from the vertex of the curved surface on the upper surface of the light-transmitting colloid to the reference plane.

[0010] In some embodiments, the lampshade is made of a transparent material, and the material of the lampshade is epoxy resin.

[0011] In some embodiments, the top edge of the encapsulating colloid is in a square shape, the edge of the lower bottom surface of the lampshade is in a square shape, and the edge of the lower bottom surface of the lampshade is in close contact with the top edge of the encapsulating colloid.

[0012] In some embodiments, the light emitting chip includes a red light chip, a green light chip, and a blue light chip, and the red light chip, the green light chip, and the blue light chip are arranged linearly.

[0013] The present invention further provides an LED display system, comprising a plurality of LED display screens, on which the above-mentioned isotropic LED lamp beads are installed.

[0014] The present invention also provides a movie screen, comprising an LED display screen, on which the above-mentioned isotropic LED lamp beads are installed.

[0015] The present invention has the following beneficial effects: The present invention discloses an isotropic LED lamp bead, comprising a light-emitting chip, a lamp bead holder, an encapsulating body, and a lampshade disposed above the encapsulating body. Multiple light-emitting chips are disposed above the lamp bead holder and electrically connected to the lamp bead holder. The lamp bead holder is disposed within the encapsulating body. The interior of the encapsulating body and the top of the light-emitting chip are covered with a light-transmitting body having a downwardly concave, smooth, curved surface. The lampshade covers the top of the encapsulating body and has a protruding light-expanding portion. The light-expanding portion extends away from the encapsulating body, has a smooth, curved inner surface, and forms a refractive cavity between the inner surface of the light-expanding portion and the upper surface of the light-transmitting body. The lampshade converts the original point light source of the lamp bead into a surface light source, effectively expanding the light-emitting angle without affecting the brightness or changing the size of the light-emitting chip. This ensures that the color of the lamp bead remains constant when viewed from all directions. The present invention also discloses an LED display system and a movie screen, both of which are mounted with the above-mentioned isotropic LED lamp bead. It effectively improves the realism of the LED display system environment simulation and also improves the viewing effect of the movie screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG1 is a front view of an isotropic LED lamp bead of the present invention;

[0017] FIG2 is a front cross-sectional view of an isotropic LED lamp bead of the present invention;

[0018] FIG3 is a top cross-sectional view of an isotropic LED lamp bead of the present invention;

[0019] FIG4 is a front cross-sectional view of another embodiment of a lampshade of an isotropic LED lamp bead according to the present invention;

[0020] FIG5 is a front cross-sectional view of another embodiment of a lampshade of an isotropic LED lamp bead according to the present invention;

[0021] FIG6 is a schematic diagram according to FIG2 ;

[0022] FIG7 is a perspective view of an LED display system according to the present invention;

[0023] FIG8 is a front view of a movie screen in the prior art. DETAILED DESCRIPTION

[0024] To facilitate understanding of the present invention, the present invention will be described in more detail below with reference to the accompanying drawings and specific embodiments. Preferred embodiments of the present invention are shown in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present invention.

[0025] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification are intended solely for the purpose of describing specific embodiments and are not intended to limit the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0026] The present invention provides an isotropic LED lamp bead, which will not produce color deviation when viewed from all directions.

[0027] As shown in FIG. 1 to FIG. 3 , as an embodiment of an isotropic LED lamp bead, the isotropic LED lamp bead includes a light emitting chip 2 , a lamp bead bracket 3 , an encapsulating colloid 4 , and a lampshade 1 disposed above the encapsulating colloid 4 .

[0028] There are multiple light-emitting chips 2. Each light-emitting chip 2 is disposed above a lamp holder 3 and is electrically connected to the lamp holder 3. The lamp holder 3 is disposed within an encapsulating colloid 4. A light-transmitting colloid 5 covers the interior of the encapsulating colloid 4 and the top of the light-emitting chips 2. The top surface of the light-transmitting colloid 5 is higher than the top surface of the light-emitting chips 2 in the vertical direction. The light-transmitting colloid 5 has a smooth, downwardly concave curved surface.

[0029] The lampshade 1 covers the encapsulating body 4 and has a protruding light-expanding portion 11. The light-expanding portion 11 extends away from the encapsulating body 4 and has a smooth curved inner surface. A refractive cavity 8 is formed between the inner surface of the light-expanding portion 11 and the upper surface of the light-transmitting body 5.

[0030] In this embodiment, there are three light-emitting chips 2. As shown in Figure 3, the light-emitting chips 2 include a red chip, a green chip, and a blue chip, which are arranged linearly. Of course, these three light-emitting chips 2 can also be arranged in other ways, such as a herringbone pattern. Other arrangements are not shown in the figure. In this embodiment, the three light-emitting chips 2 are preferably arranged linearly.

[0031] In the isotropic LED lamp beads provided by the present invention, a lampshade 1 is positioned above the upper surface of a light-transmitting colloid 5. Together, the two form an air cavity, or refractive cavity 8. Within refractive cavity 8, light refraction transforms the light source of the light-emitting chip 2 from a point source into a surface source. Consequently, the altered optical path increases the luminous angle during display. When viewed from different directions, the luminous color of the lamp beads remains consistent, preventing color temperature deviation. This effectively solves the problem of color temperature drift when viewed in different scenes.

[0032] As shown in Figures 2 and 3 , the light emitting chip 2 is disposed above the lamp bead holder 3 , and the light emitting chip 2 is electrically connected to the lamp bead holder 3 . The lamp bead holder 3 is disposed inside the encapsulation colloid 4 .

[0033] Furthermore, the lamp bead bracket 3 includes an anode bracket 31 and a cathode bracket 32, and the number of cathode brackets 32 corresponds to the number of light-emitting chips 2; the bottom surface of the light-emitting chip 2 is fixed to the upper surface of the anode bracket 31 through a conductive colloid 7, and a wire 6 is connected between the upper surface of the light-emitting chip 2 and the cathode bracket 32.

[0034] In this embodiment, there is one anode bracket 31 and three cathode brackets 32. Four lamp bead brackets 3 are fixed inside the encapsulation 4. The portions of the four lamp bead brackets 3 that extend out of the encapsulation 4 are formed with four pins 33, which are used to connect to pads on the PCB.

[0035] The above situation is that the three light-emitting chips 2 share the anode. Preferably, the three light-emitting chips 2 can also share the cathode. In this case (not shown), the number of anode brackets corresponds to the number of light-emitting chips 2; the bottom surface of the light-emitting chip 2 is fixed to the upper surface of the cathode bracket through the conductive colloid 7, and a wire 6 is connected between the upper surface of the light-emitting chip 2 and the anode bracket. Correspondingly, the number of cathode brackets is one, and the number of anode brackets is three. The four lamp bead brackets 3 are fixed inside the packaging colloid 4, and the four lamp bead brackets 3 extend out of the packaging colloid 4 to form four pins 33, which are used to connect to the pads on the PCB board.

[0036] In this embodiment, the bottom surfaces of the three light-emitting chips 2, namely the red light chip, the green light chip, and the blue light chip, are fixed to the anode support 31 via conductive colloid 7. In this embodiment, the conductive colloid 7 is silver glue. The silver glue mainly plays the role of bonding and conducting electricity.

[0037] Furthermore, a wire 6 is connected between the upper surface of the light-emitting chip 2 and the cathode holder 32. In this embodiment, the three light-emitting chips 2 are connected to the three cathode holders 32 via three wires 6, respectively. The wires 6 can be gold, silver, copper, or alloy wires. In this embodiment, gold wire is preferred due to its stable performance, oxidation resistance, and ability to ensure stable contact between the cathode holder 32 and the light-emitting chip 2.

[0038] Furthermore, as shown in FIG. 2 , the interior of the packaging colloid 4 and the top of the light-emitting chip 2 are covered with a light-transmitting colloid 5 , and the light-transmitting colloid 5 is formed with a smooth arc surface that is concave downward.

[0039] In this embodiment, both the encapsulating colloid 4 and the light-transmitting colloid 5 are epoxy resins. The epoxy resin primarily protects the internal structure of the lamp bead and helps shape it. It can also slightly alter the color, brightness, and angle of the light emitted by the lamp bead. The light-transmitting colloid 5 fills the inner cavity of the encapsulating colloid 4, covering the periphery and top surface of each light-emitting chip 2. The edge contour of the light-transmitting colloid 5 is flush with the top of the encapsulating colloid 4. The light-transmitting colloid 5 is in a fluid state before curing. It is formed using a specific mold, resulting in a desired smooth curved surface after curing. The degree of downward concavity of this smooth curved surface can be adjusted based on the mold used.

[0040] As shown in FIG2 , the lampshade 1 is further covered on the encapsulating body 4 and has a protruding light-expanding portion 11. The light-expanding portion 11 extends away from the encapsulating body 4 and has a smooth curved inner surface. A refractive cavity 8 is formed between the inner surface of the light-expanding portion 11 and the upper surface of the light-transmitting body 5.

[0041] In conjunction with Figures 2 and 3, due to the refraction of light, the three light-emitting chips 2 are mixed and emitted into the refraction cavity 8. In the refraction cavity 8, the light is refracted again by the air, the light path is changed, the luminous angle is increased, and the light source is transformed from a point light source to a surface light source. Therefore, when viewed from all directions, the color of the lamp beads will not deviate.

[0042] In this embodiment, the cross-sectional dimension of the light-expanding portion 11 gradually decreases in a direction away from the encapsulant 4. The portion of the light-expanding portion 11 that is farthest from the encapsulant 4 has the smallest cross-sectional area.

[0043] Furthermore, the shape of the bottom surface of the lampshade 1 matches the shape of the top edge of the encapsulating colloid 4 .

[0044] In this embodiment, the top edge of the encapsulating body 4 is square, the bottom edge of the lampshade 1 is square, and the bottom edge of the lampshade 1 is tightly fitted with the top edge of the encapsulating body 4 .

[0045] Furthermore, the lampshade 1 is made of a transparent material that does not affect the color of the LED light. In some embodiments, the transparent material can be epoxy resin. Epoxy resin acts as an optical lens, and when made into the lampshade 1, it can control the light emission angle of the LED light. Epoxy resin also improves light extraction efficiency and reduces total internal reflection of light.

[0046] As shown in FIG. 2 , the light expanding portion 11 includes a first arc surface 111 and a second arc surface 112 . The horizontal plane where the first arc surface 111 and the light-transmitting colloid 5 contact each other is the reference plane 81 .

[0047] In this embodiment, the vertical distance L1 from the arc vertex of the first arc surface 111 to the reference plane 81 is equal to the vertical distance L2 from the arc vertex of the upper surface 51 of the light-transmitting colloid 5 to the reference plane 81, that is, L1 = L2. In this case, the isotropic LED lamp beads can form one kind of light-emitting angle.

[0048] As shown in FIG. 4, in some embodiments, the vertical distance L1 from the arc vertex of the first arc surface 111 to the reference plane 81 is less than the vertical distance L2 from the arc vertex of the upper surface 51 of the light-transmitting colloid 5 to the reference plane 81, that is, L1 < L2. In this case, the isotropic LED lamp beads can form another kind of light-emitting angle.

[0049] As shown in FIG. 5, in some embodiments, the vertical distance L1 from the arc vertex of the first arc surface 111 to the reference plane 81 is greater than the vertical distance L2 from the arc vertex of the upper surface 51 of the light-transmitting colloid 5 to the reference plane 81, that is, L1 > L2. In this case, the isotropic LED lamp beads can become a third kind of light-emitting angle.

[0050] The change in the radian of the lamp cover 1 corresponds to the change in the light-emitting angle of the lamp beads. The above three situations also represent three different light-emitting angles of the lamp beads. It should be noted that the above three changes are only examples of the present invention. According to the usage needs, other deformations of the lamp cover 1 can be obtained by calculating according to the following formula.

[0051] As shown in FIG. 6, according to the geometric optics theory, the structural parameters of the lamp cover 1: the contact angle θ, the focal length f, the outer diameter D, the radius of curvature R, and the crown height H satisfy the following relational expressions:

[0052] In the formula, n0 is the refractive index of air, and n1 is the refractive index of the lamp cover 1. Here, the outer diameter D is equal to the package side length of the lamp beads.

[0053] And the bottom side dimension of the refraction cavity 8 is d, and h is the height of the refraction cavity 8, and there is:

[0054] By combining them, we can get:

[0055] The structure of the lamp cover 1 can be determined by calculating with the above parameters.

[0056] As shown in FIG. 7, the present invention also provides an LED display system 9, including a plurality of LED display screens, and the isotropic LED lamp beads in the above embodiments are installed on the LED display screens.

[0057] In this embodiment, there are three LED display screens, including a left screen 91, a right screen 92 and a ground screen 93. The three display screens are spliced ​​together to form an LED display system 9, thereby making a simple studio. When shooting in a studio, the shooting effect is required to be high. In addition to meeting conventional indicators, it is also necessary to pay attention to higher specifications such as frame rate and color. The isotropic LED lamp beads in the above embodiment can meet these requirements. Using the lamp beads provided by the present invention, when shooting multiple LED display screens, under the same picture, shooting from different directions, the picture colors of multiple display screens are consistent, thereby improving the realism of the environmental simulation.

[0058] The present invention further provides a movie screen, comprising an LED display screen, on which the isotropic LED lamp beads in the above embodiment are installed.

[0059] As shown in Figure 8, it is a movie screen 10 in the prior art. In the field of movie display, there are fixed requirements for resolution, so when the LED display screen is placed in the movie screen, the number of LED lamp beads is also fixed. As the size of the screen changes, the spacing between the lamp beads will also change. Since the light-emitting area of ​​the lamp beads is limited, when the spacing between the lamp beads is too large, a dark area 101 as shown in the figure will be generated, which appears as a black line when the human eye views the screen, that is, moiré. This results in a poor viewing effect. The isotropic LED lamp beads provided by the present invention can just solve this problem. Install it in an LED display screen, and place this LED display screen in the movie screen 10. At this time, the lamp beads in the movie screen 10 have been improved, and the light-emitting area has been effectively expanded, so that the dark area 101 is reduced, that is, the moiré is eliminated, thereby effectively improving the viewing effect.

[0060] As can be seen, the present invention discloses an isotropic LED lamp bead, comprising a light-emitting chip, a lamp bead holder, an encapsulating body, and a lampshade disposed above the encapsulating body. There are multiple light-emitting chips, each disposed above the lamp bead holder and electrically connected to the lamp bead holder. The lamp bead holder is disposed within the encapsulating body. The interior of the encapsulating body and the top of the light-emitting chip are covered with a light-transmitting body, which has a smooth, curved surface that is concave downward. The lampshade covers the top of the encapsulating body and has a protruding light-expanding portion. The light-expanding portion extends away from the encapsulating body, and its inner surface is a smooth, curved surface. A refractive cavity is formed between the inner surface of the light-expanding portion and the upper surface of the light-transmitting body. The lampshade converts the original point light source of the lamp bead into a surface light source, effectively expanding the light-emitting angle without affecting the brightness or changing the size of the light-emitting chip. This ensures that the color of the lamp bead remains constant when viewed from all directions. The present invention also discloses an LED display system and a movie screen, both of which are mounted with the above-mentioned isotropic LED lamp bead. It effectively improves the realism of the LED display system environment simulation and also improves the viewing effect of the movie screen.

[0061] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's description and drawings, or directly or indirectly applied to other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An isotropic LED lamp bead, characterized in that: It includes a light-emitting chip, a lamp bead bracket, a packaging colloid, and a lampshade arranged above the packaging colloid; The number of the light-emitting chips is multiple, and the light-emitting chips are arranged above the lamp bead bracket, and the light-emitting chips are electrically connected to the lamp bead bracket; The lamp bead support is arranged inside the packaging colloid; The inside of the packaging colloid and the top of the light-emitting chip are covered with a light-transmitting colloid, and the light-transmitting colloid is formed with a smooth curved surface that is concave downwards; The lampshade covers the top of the packaging colloid, and has a protruding light-expanding portion, which extends in a direction away from the packaging colloid. The inner surface of the light-expanding portion is a smooth curved surface, and a refractive cavity is formed between the inner surface of the light-expanding portion and the upper surface of the light-transmitting colloid.

2. The isotropic LED lamp bead according to claim 1, characterized in that: The cross-sectional dimension of the light expansion portion gradually decreases in a direction away from the encapsulation colloid.

3. The isotropic LED lamp bead according to claim 2, characterized in that: The lamp bead bracket includes an anode bracket and a cathode bracket, and the number of the cathode brackets corresponds to the number of the light-emitting chips; the bottom surface of the light-emitting chip is fixed to the upper surface of the anode bracket through a conductive colloid, and a wire is connected between the upper surface of the light-emitting chip and the cathode bracket.

4. The isotropic LED lamp bead according to claim 3, characterized in that: The light expansion portion includes a first curved surface and a second curved surface, and a horizontal plane where the first curved surface and the light-transmitting colloid are in contact is a reference plane.

5. The isotropic LED lamp bead according to claim 4, characterized in that: The vertical distance from the arc vertex of the first arc surface to the reference plane is equal to the vertical distance from the arc vertex of the upper surface of the light-transmitting colloid to the reference plane; or, the vertical distance from the arc vertex of the first arc surface to the reference plane is smaller than the vertical distance from the arc vertex of the upper surface of the light-transmitting colloid to the reference plane; or, the vertical distance from the arc vertex of the first arc surface to the reference plane is greater than the vertical distance from the arc vertex of the upper surface of the light-transmitting colloid to the reference plane.

6. The isotropic LED lamp bead according to claim 5, characterized in that: The lampshade is made of a transparent material, and the material of the lampshade is epoxy resin.

7. The isotropic LED lamp bead according to claim 6, characterized in that: The shape of the top edge of the packaging colloid is square, the edge of the lower bottom surface of the lampshade is square, and the edge of the lower bottom surface of the lampshade is tightly fitted with the top edge of the packaging colloid.

8. The isotropic LED lamp bead according to claim 1, characterized in that: The light emitting chip comprises a red light chip, a green light chip and a blue light chip, and the red light chip, the green light chip and the blue light chip are arranged linearly.

9. An LED display system, characterized in that: It comprises a plurality of LED display screens, on which the isotropic LED lamp beads according to any one of claims 1 to 8 are installed.

10. A movie screen, characterized in that: It comprises an LED display screen, on which the isotropic LED lamp beads according to any one of claims 1 to 8 are installed.

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