Isotropic LED lamp bead, LED display system and movie screen

Abstract

The application discloses an isotropic LED lamp bead, which comprises a light emitting chip, a lamp bead support, a packaging glue body and a lamp cover arranged above the packaging glue body. The light emitting chip is electrically connected with the lamp bead support. The inside of the packaging glue body and the top of the light emitting chip are covered with a light-transmitting glue body, and the light-transmitting glue body is formed with a smooth arc surface which is concave downward. The lamp cover is covered on the top of the packaging glue body, and the lamp cover is provided with a convex light-expanding part. The inner surface of the light-expanding part is a smooth arc surface, and a refraction cavity is formed between the inner surface of the light-expanding part and the top surface of the light-transmitting glue body. The lamp cover can change the original point light source of the lamp bead into a surface light source, effectively expands the light emitting angle of the lamp bead, and makes the color not deviate when the lamp bead is viewed from all directions. The application further discloses an LED display system and a movie screen, and the isotropic LED lamp bead is arranged on the top of the LED display system and the movie screen. The LED display system environment simulation is effectively improved, and the movie screen viewing effect is improved.

Description

Technical Field

[0001] This invention belongs to the field of LED display technology, and particularly relates to an isotropic LED lamp bead, an LED display system, and a movie screen. Background Technology

[0002] Currently, LED display systems are widely used in virtual photography. In virtual photography studios, high-quality shooting is required, demanding not only on standard specifications but also on higher standards such as frame rate and color accuracy. However, with current technology, when shooting multiple LED displays, the colors displayed on different screens will vary depending on the angle from which the same scene is captured, affecting the realism of the environmental simulation. This color temperature shift at large angles is closely related to the internal design of the display, specifically the design of the LED chips. When the human eye looks directly at the LED chip, it observes the correct color; however, if the angle at which the eye observes the chip gradually decreases and approaches horizontal, blind spots or dead angles will appear, leading to color deviations. The reason for this color deviation is that the light emitted by one or two LED chips is blocked, preventing the human eye from fully observing all three colors of light. This applies to individual LED chips and the entire display screen. Relying solely on LED chips manufactured using traditional processes cannot fundamentally solve this problem. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an isotropic LED bead, an LED display system and a cinema screen, so as to solve the problem that the color of the LED beads in the screen is deviated when viewed from different angles during the direct display process in the prior art.

[0004] To solve the above-mentioned technical problems, the present invention provides an isotropic LED bead, including a light-emitting chip, a bead support, an encapsulating colloid, and a lampshade disposed above the encapsulating colloid; the number of light-emitting chips is multiple, the light-emitting chips are disposed above the bead support, and the light-emitting chips are electrically connected to the bead support; the bead support is disposed inside the encapsulating colloid; a light-transmitting colloid is covered inside the encapsulating colloid and above the light-emitting chips, the light-transmitting colloid forming a downwardly concave smooth arc surface; the lampshade covers the encapsulating colloid, the lampshade having a protruding light-expanding portion, the light-expanding portion extending in a direction away from the encapsulating colloid, the inner surface of the light-expanding portion being a smooth arc surface, and a refractive cavity being formed between the inner surface of the light-expanding portion and the upper surface of the light-transmitting colloid.

[0005] In some embodiments, the cross-sectional dimension of the light-amplifying portion gradually decreases in the direction away from the encapsulating colloid.

[0006] In some embodiments, the lamp bead bracket includes an anode bracket and a cathode bracket, the number of cathode brackets corresponding to the number of light-emitting chips; the bottom surface of the light-emitting chip is fixed to the upper surface of the anode bracket by a conductive adhesive, and a wire is connected between the upper surface of the light-emitting chip and the cathode bracket.

[0007] In some embodiments, the light-amplifying portion includes a first arc surface and a second arc surface, and the horizontal plane at which the portion of the first arc surface and the light-transmitting colloid are in contact is a reference plane.

[0008] In some embodiments, the vertical distance from the vertex of the first arc surface to the reference plane is equal to the vertical distance from the bottom point of the arc surface of the upper surface of the light-transmitting colloid to the reference plane; or, the vertical distance from the vertex of the first arc surface to the reference plane is less than the vertical distance from the bottom point of the arc surface of the upper surface of the light-transmitting colloid to the reference plane; or, the vertical distance from the vertex of the first arc surface to the reference plane is greater than the vertical distance from the bottom point of the arc surface of the upper surface of the light-transmitting colloid to the reference plane.

[0009] In some embodiments, the lampshade is made of a transparent material, specifically epoxy resin.

[0010] In some embodiments, the top edge of the encapsulating colloid is square, the bottom edge of the lampshade is square, and the bottom edge of the lampshade is in close contact with the top edge of the encapsulating colloid.

[0011] In some embodiments, the light-emitting chip includes a red light chip, a green light chip, and a blue light chip, which are arranged linearly.

[0012] The present invention also provides an LED display system, including multiple LED displays, wherein the isotropic LED beads described above are installed on the LED displays.

[0013] The present invention also provides a movie screen, including an LED display screen on which the isotropic LED beads described above are mounted.

[0014] The beneficial effects of this invention are as follows: This invention discloses an isotropic LED light bead, including a light-emitting chip, a light bead bracket, an encapsulating colloid, and a lampshade disposed above the encapsulating colloid. Multiple light-emitting chips are present, positioned above the light bead bracket and electrically connected to it. The light bead bracket is disposed inside the encapsulating colloid. A light-transmitting colloid covers the inside of the encapsulating colloid and the top of the light-emitting chips, forming a smooth, downward-concave arc surface. The lampshade covers the encapsulating colloid and has a protruding light-expanding portion. The light-expanding portion extends away from the encapsulating colloid, and its inner surface is a smooth arc surface, forming a refractive cavity between the inner surface of the light-expanding portion and the upper surface of the light-transmitting colloid. This lampshade can transform the original point light source of the light bead into a surface light source, effectively expanding the light emission angle without affecting the brightness or changing the size of the light-emitting chip. This ensures that the color does not deviate when viewing the light bead from any direction. This invention also discloses an LED display system and a cinema screen, both of which are equipped with the aforementioned isotropic LED light beads. It effectively improves the realism of the environment simulation in the LED display system and also enhances the viewing experience of the movie screen. Attached Figure Description

[0015] Figure 1 This is a front view of an isotropic LED bead according to the present invention;

[0016] Figure 2 This is a front sectional view of an isotropic LED bead according to the present invention;

[0017] Figure 3 This is a top sectional view of an isotropic LED lamp bead according to the present invention;

[0018] Figure 4 This is a front sectional view of another embodiment of the lampshade of an isotropic LED bead according to the present invention;

[0019] Figure 5 This is a front sectional view of another embodiment of the lampshade of an isotropic LED bead according to the present invention;

[0020] Figure 6 It is based on Figure 2 A schematic diagram;

[0021] Figure 7 This is a perspective view of an LED display system according to the present invention;

[0022] Figure 8 This is a front view of a movie screen in the prior art. Detailed Implementation

[0023] To facilitate understanding of the present invention, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0024] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is 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.

[0025] The present invention provides an isotropic LED light bead that does not produce color deviation when viewed from any direction.

[0026] like Figures 1 to 3 As shown, 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 lamp cover 1 disposed above the encapsulating colloid 4.

[0027] There are multiple light-emitting chips 2. The light-emitting chips 2 are disposed above the lamp bead bracket 3 and are electrically connected to the lamp bead bracket 3. The lamp bead bracket 3 is disposed inside the encapsulating colloid 4. The interior of the encapsulating colloid 4 and the top of the light-emitting chips 2 are covered with a light-transmitting colloid 5. In the height direction, the upper surface of the light-transmitting colloid 5 is higher than the upper surface of the light-emitting chips 2; the light-transmitting colloid 5 forms a smooth arc surface that is concave downwards.

[0028] The lampshade 1 covers the top of the encapsulating colloid 4, and the lampshade 1 has a protruding light-expanding part 11. The light-expanding part 11 extends in a direction away from the encapsulating colloid 4, and the inner surface of the light-expanding part 11 is a smooth arc surface. A refractive cavity 8 is formed between the inner surface of the light-expanding part 11 and the upper surface of the light-transmitting colloid 5.

[0029] In this embodiment, the number of light-emitting chips 2 is three. For example... Figure 3 As shown, the light-emitting chip 2 includes a red light chip, a green light chip, and a blue light chip, which are arranged linearly. Of course, these three types of light-emitting chips 2 can also be arranged in other ways, such as in a triangular pattern; other arrangements are not shown in the figure. In this embodiment, the three light-emitting chips 2 are preferably arranged linearly.

[0030] The isotropic LED bead provided by this invention has a lampshade 1 covering the upper surface of a light-transmitting colloid 5, and the two together form an air cavity, namely a refractive cavity 8. Within the refractive cavity 8, due to light refraction, the light source of the light-emitting chip 2 can be transformed from a point light source into a surface light source. Therefore, when the LED bead is used for display, the change in the light path increases the emission angle, and the emitted color of the LED bead maintains its original hue when viewed from different directions, without color temperature deviation, effectively solving the problem of color temperature drift when viewed in different scenarios.

[0031] like Figures 2 to 3 As shown, the light-emitting chip 2 is disposed above the lamp bead bracket 3, and the light-emitting chip 2 is electrically connected to the lamp bead bracket 3. The lamp bead bracket 3 is disposed inside the encapsulating colloid 4.

[0032] Furthermore, the lamp bead bracket 3 includes an anode bracket 31 and a cathode bracket 32, the number of cathode brackets 32 corresponding 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 by 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.

[0033] In this embodiment, there is one anode support 31 and three cathode supports 32. The four LED bead supports 3 are fixed inside the encapsulating colloid 4, and the portions of the four LED bead supports 3 protruding from the encapsulating colloid 4 form four pins 33, which are used to connect to the pads on the PCB board.

[0034] In the above scenario, three LED chips 2 share a common anode. Preferably, the three LED chips 2 can also share a common cathode. In this case (not shown in the figure), the number of anode supports corresponds to the number of LED chips 2. The bottom surface of the LED chip 2 is fixed to the upper surface of the cathode support by conductive adhesive 7, and a wire 6 connects the upper surface of the LED chip 2 and the anode support. Correspondingly, there is one cathode support and three anode supports. Four LED bead supports 3 are fixed inside the encapsulating adhesive 4, and the portions of the four LED bead supports 3 protruding from the encapsulating adhesive 4 form four pins 33, which are used to connect to the pads on the PCB board.

[0035] In this embodiment, the bottom surfaces of the three light-emitting chips 2—the red, green, and blue chips—are respectively fixed to the anode support 31 using conductive adhesive 7. In this embodiment, the conductive adhesive 7 is silver paste. The silver paste mainly serves to adhere and conduct electricity.

[0036] Furthermore, a wire 6 connects the upper surface of the light-emitting chip 2 to the cathode support 32. In this embodiment, the three light-emitting chips 2 are respectively connected to the three cathode supports 32 via three wires 6. The wire 6 can be gold wire, silver wire, copper wire, or alloy wire. In this embodiment, gold wire is preferred because it has stable performance, can prevent oxidation, and can ensure stable contact between the cathode support 32 and the light-emitting chip 2.

[0037] Furthermore, such as Figure 2 As shown, the interior of the encapsulating colloid 4 and the top of the light-emitting chip 2 are covered with a light-transmitting colloid 5, which has a smooth arc surface that is concave downwards.

[0038] In this embodiment, both the encapsulating colloid 4 and the light-transmitting colloid 5 are epoxy resins. The main function of the epoxy resin is to protect the internal structure of the LED chip and shape it. Simultaneously, the epoxy resin can also slightly alter the LED's emission color, brightness, and emission angle. The light-transmitting colloid 5 fills the inner cavity of the encapsulating colloid 4, covering the periphery and top surface of each LED chip 2, and the edge contour of the light-transmitting colloid 5 is flush with the top of the encapsulating colloid 4. Before curing, the light-transmitting colloid 5 is in a fluid state. It is shaped using a specific mold, and after curing, a smooth curved surface is obtained. The degree of downward concavity of this smooth curved surface can be adjusted according to different molds.

[0039] like Figure 2 As shown, further, the lampshade 1 covers the top of the encapsulating colloid 4, and the lampshade 1 has a protruding light-expanding portion 11. The light-expanding portion 11 extends in a direction away from the encapsulating colloid 4, and the inner surface of the light-expanding portion 11 is a smooth arc 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 colloid 5.

[0040] Combination Figure 2 , Figure 3 Due to light refraction, the three light-emitting chips 2 are mixed and then directed towards the refraction cavity 8. In the refraction cavity 8, the light is refracted again by the air, the light path changes, the light emission angle becomes larger, and the light source changes from a point light source to a surface light source. Therefore, the color of the LED beads will not deviate when viewed from any direction.

[0041] In this embodiment, the cross-sectional dimension of the light-amplifying portion 11 gradually decreases in the direction away from the encapsulating colloid 4. The portion of the light-amplifying portion 11 furthest from the encapsulating colloid 4 has the smallest cross-sectional area.

[0042] Furthermore, the shape of the bottom surface of the lampshade 1 is adapted to the shape of the top edge of the encapsulating colloid 4.

[0043] In this embodiment, the top edge of the encapsulating colloid 4 is square, the bottom edge of the lampshade 1 is square, and the bottom edge of the lampshade 1 is closely attached to the top edge of the encapsulating colloid 4.

[0044] Furthermore, the lamp cover 1 is made of a transparent material. The transparent lamp cover 1 will not affect the light-emitting color of the lamp beads. In some embodiments, the transparent material may be epoxy resin. The epoxy resin acts as an optical lens. Making it into the lamp cover 1 can control the light-emitting angle of the LED lamp beads. The epoxy resin can also improve the light extraction efficiency and reduce the total internal reflection of light.

[0045] As Figure 2 shown, the light diffusing part 11 includes a first arc surface 111 and a second arc surface 112. The horizontal plane where the part of the first arc surface 111 in contact with the light-transmitting colloid 5 is located is the reference plane 81.

[0046] In this embodiment, the vertical distance L1 from the arc surface vertex of the first arc surface 111 to the reference plane 81 is equal to the vertical distance L2 from the arc surface bottom point 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 a kind of light-emitting angle.

[0047] As Figure 4 shown, in some embodiments, the vertical distance L1 from the arc surface vertex of the first arc surface 111 to the reference plane 81 is less than the vertical distance L2 from the arc surface bottom point 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.

[0048] As Figure 5 shown, in some embodiments, the vertical distance L1 from the arc surface vertex of the first arc surface 111 to the reference plane 81 is greater than the vertical distance L2 from the arc surface bottom point 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.

[0049] 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 cases 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.

[0050] As Figure 6 shown, according to the geometric optics theory, the structural parameters of the lamp cover 1: the contact angle , the focal length , the outer diameter , the radius of curvature and the crown height satisfy the following relational formula:

[0051]

[0052]

[0053]

[0054] In the formula The refractive index of air, Let be the refractive index of lampshade 1, where the outer diameter is... It equals the side length of the LED chip's package.

[0055] The bottom dimension of the refraction cavity 8 is... , Given the height of the refractive cavity 8, we have:

[0056]

[0057] By combining the equations, we can obtain:

[0058]

[0059] The structure of lampshade 1 can be determined by calculating the above parameters.

[0060] like Figure 7 As shown, the present invention also provides an LED display system 9, including a plurality of LED displays, on which isotropic LED beads as described in the above embodiments are installed.

[0061] In this embodiment, there are three LED displays: a left screen 91, a right screen 92, and a ground screen 93. These three displays are spliced ​​together to form an LED display system 9, thus creating a simple film studio. When shooting in a film studio, high-quality shooting is required; in addition to meeting conventional specifications, higher requirements such as frame rate and color accuracy are also needed. The isotropic LED beads in the above embodiment can meet these requirements. Using the LED beads provided by this invention, when shooting multiple LED displays, the colors of the images on the same scene from different directions remain consistent, thereby improving the realism of the environmental simulation.

[0062] The present invention also provides a movie screen, including an LED display screen on which isotropic LED beads as described in the above embodiments are mounted.

[0063] like Figure 8The image shows a cinema screen 10 in the prior art. In the field of cinema display, there are fixed requirements for resolution, so the number of LED beads is also fixed when an LED display screen is placed in a cinema screen. As the screen size changes, the spacing between the beads also changes. Since the light-emitting area of ​​the beads is limited, when the spacing between the beads is too large, a dark area 101 as shown in the figure will be generated, which appears as black lines, i.e., moiré patterns, when viewed by the human eye. This leads to a deterioration in the viewing experience. The isotropic LED beads provided by this invention can solve this problem. They are installed in an LED display screen, and this LED display screen is placed in the cinema screen 10. At this time, the LED beads in the cinema screen 10 are improved, and the light-emitting area is effectively expanded, thus reducing the dark area 101, i.e., eliminating moiré patterns, thereby effectively improving the viewing experience.

[0064] Therefore, this invention discloses an isotropic LED bead, including a light-emitting chip, a bead support, an encapsulating colloid, and a lampshade disposed above the encapsulating colloid. Multiple light-emitting chips are disposed above the bead support and are electrically connected to it. The bead support is disposed inside the encapsulating colloid. A light-transmitting colloid is covering the inside of the encapsulating colloid and above the light-emitting chips, forming a smooth, downward-concave arc surface. The lampshade covers the encapsulating colloid and has a protruding light-expanding portion. The light-expanding portion extends away from the encapsulating colloid, and its inner surface is a smooth arc surface, forming a refractive cavity between the inner surface of the light-expanding portion and the upper surface of the light-transmitting colloid. This lampshade can transform the original point light source of the LED bead into a surface light source, effectively expanding the light emission angle without affecting the brightness or changing the size of the light-emitting chip. This ensures that the color does not deviate when viewing the LED bead from any direction. This invention also discloses an LED display system and a cinema screen, both of which are equipped with the aforementioned isotropic LED bead. It effectively improves the realism of the environment simulation in the LED display system and also enhances the viewing experience of the movie screen.

[0065] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within 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, an encapsulating colloid, and a lamp cover disposed on top of the encapsulating colloid; The number of light-emitting chips is multiple, the light-emitting chips are disposed above the lamp bead bracket, the light-emitting chips are electrically connected to the lamp bead bracket, and the light-emitting chips share a common anode or a common cathode; The lamp bead bracket is disposed inside the encapsulating colloid; The interior of the encapsulating colloid and the top of the light-emitting chip are covered with a light-transmitting colloid, and the upper surface of the light-transmitting colloid has a smooth arc surface that is concave downwards. The lampshade covers the top of the encapsulating colloid, and the lampshade has a protruding light-expanding part that extends away from the encapsulating colloid. The inner surface of the light-expanding part is a smooth arc surface, and a refractive cavity is formed between the inner surface of the light-expanding part and the upper surface of the light-transmitting colloid. The light-amplifying part includes a first arc surface and a second arc surface. The horizontal plane where the first arc surface contacts the light-transmitting colloid is a reference plane. The cross-sectional dimension of the light-amplifying part gradually decreases in the direction away from the encapsulating colloid. The part of the light-amplifying part that is farthest from the encapsulating colloid has the smallest cross-sectional area.

2. The isotropic LED bead according to claim 1, characterized in that, The lamp bead support includes an anode support and a cathode support, the number of cathode supports corresponding to the number of light-emitting chips; the bottom surface of the light-emitting chip is fixed to the upper surface of the anode support by a conductive adhesive, and a wire is connected between the upper surface of the light-emitting chip and the cathode support.

3. The isotropic LED bead according to claim 2, characterized in that, The vertical distance from the vertex of the first arc surface to the reference plane is equal to, less than, or greater than the vertical distance from the bottom point of the arc surface of the upper surface of the light-transmitting colloid to the reference plane.

4. The isotropic LED bead according to claim 3, characterized in that, The lampshade is made of transparent material, specifically epoxy resin.

5. The isotropic LED bead according to claim 4, characterized in that, The top edge of the encapsulating colloid is square, the bottom edge of the lampshade is square, and the bottom edge of the lampshade is in close contact with the top edge of the encapsulating colloid.

6. The isotropic LED bead according to claim 1, characterized in that, The light-emitting chip includes a red light chip, a green light chip, and a blue light chip, which are arranged linearly.

7. An LED display system, characterized in that, It includes multiple LED displays, on which isotropic LED beads as described in any one of claims 1 to 6 are mounted.

8. A movie screen, characterized in that, The device includes an LED display screen, on which isotropic LED beads as described in any one of claims 1 to 6 are mounted.

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