A structure of backlit LED beads for an LED screen

Abstract

This utility model relates to the field of lighting technology and discloses an LED screen backlighting lamp bead structure, including electrode leads, a glass plate, lamp bead mechanisms, and electrode connectors. In this utility model, two lamp bead mechanisms are bonded and fixed together by PVB adhesive on their back sides. The PVB adhesive is bonded to the upper part of the opening plate corresponding to the opening plate in the lamp bead mechanism on the back side, so that the two lamp bead mechanisms are facing opposite directions to form a display state on the upper and lower sides, forming a double-sided display effect. This reduces the need for glass material to isolate and fix the two lamp bead mechanisms, avoids structural complexity, and prevents a large structural thickness for double-sided illumination. The light reflected from the edge of the light guide plate illuminates the glass plate below in a parallel state, and the light guide plate diffuses the illuminated light parallel and evenly to the entire glass plate, so that most of the light is parallel and downward, providing a uniform surface light source.

Description

Technical Field

[0001] This utility model relates to the field of lighting technology, specifically to an LED screen backlight bead structure. Background Technology

[0002] The current LED screens emit light from LEDs that shine forward, and the light must be refracted through the PVB film, resulting in a loss of light efficiency. Existing technology uses the divergent light emitted by LED beads and controls the light passing through the screen while the glass screen is powered on, thereby creating the image display effect.

[0003] However, to achieve double-sided illumination in an LED screen, a complex multi-layer structure is required: 5mm glass + 1.52mm PVB film + 3mm glass with printed circuitry and then front-emitting LEDs mounted + 1.14mm PVB film + 3mm glass with printed circuitry and then front-emitting LEDs mounted + 5mm glass. This structure is thick and heavy, requiring multiple layers of LEDs for illumination. The need to connect the glass plates for double-sided display further complicates the structure, resulting in a thicker structure. Moreover, the need for multiple layers of LEDs for illumination means that a single layer of LEDs cannot achieve backlighting. In a single-layer LED glass screen, most light cannot effectively penetrate the glass layer, resulting in uneven light distribution and dark areas easily forming on the back. Utility Model Content

[0004] This invention provides an LED screen backlight bead structure that overcomes the shortcomings described in the background art.

[0005] The technical solution adopted by this utility model to solve its technical problem is: An LED screen backlighting structure includes electrode leads, a glass plate, an LED bead mechanism, and an electrode connector. Two electrode leads are provided, and the electrode connector, which is attached to the surface of the glass plate, is electrically connected between the two electrode leads. The LED bead mechanism is arrayed on the surface of the glass plate, and the arranged LED bead mechanisms are divided into multiple groups connected in parallel between the two electrode leads. The outer end of the electrode connector is connected to an external power supply through a wire, and the power supply controls the lighting of the LED bead mechanism connected in parallel between the electrode leads. The lamp bead mechanism includes a display mechanism, a light guide structure, electrode pins, an encapsulating colloid, and conductive lines. The conductive lines connect two adjacent electrode pins in series on the glass plate surface. The display mechanism is horizontally fixed between the two electrode pins, and the light guide structure and encapsulating colloid are stacked sequentially on the display mechanism. The light guide structure and encapsulating colloid are fixed to the glass plate surface by the encapsulating colloid at the bottom. The electrode leads are connected to the display mechanism through the conductive lines and the electrode pins to form a closed loop, so that the display mechanism emits downward illumination light. The display mechanism is provided with a glass frame, a light guide plate, a heat-conducting substrate, a pin wire and an LED chip. The heat-conducting substrate is fixed inside the glass frame, the LED chip is fixed at the lower end of the heat-conducting substrate, and the light-emitting surface of the LED chip faces the direction of the light guide plate. The pin wire is arranged inside the glass frame, and the pin wire electrically connects the LED chip and the electrode pins. Through the electrode pins, the pin wire and the LED chip are electrically connected, so that the LED chip emits irradiation light downward. The light guide plate is fixed at the lower end of the glass frame, the light guide plate abuts against the surface of the light guide structure, the inner side of the light guide plate is an arc-shaped structure, the irradiation light emitted by the LED chip is reflected out of the pin wire through the light guide plate, and irradiates toward the back side of the LED chip.

[0006] Furthermore, the electrode pin is composed of a first conductive plate, a second conductive plate and an opening plate. The first conductive plate is fixed on the surface of the glass plate, the first conductive plate and the second conductive plate are in a "loop" shape, the opening plate is located at the inner position of the second conductive plate, the opening plate is an inverted "concave" structure, the "concave" shape corresponds to the outer end of the glass frame, so that the pin wire in the glass frame correspondingly abuts in the opening plate. The lower end of the first conductive plate is fixed on the surface of the glass plate, the side surface of the first conductive plate is electrically connected to a conductive circuit, a hollow structure is formed between the second conductive plate and the first conductive plate, and the irradiation light reflected by the light guide plate irradiates toward the back side through the hollow structure.

[0007] Furthermore, the irradiation of the LED chip is divergent irradiation, light is emitted from the LED chip in an inclined shape. When being reflected on the arc-shaped light guide plate, the light near the edge of the light guide plate is reflected and then irradiates toward the back side of the LED chip.

[0008] Furthermore, the interior of the heat-conducting substrate is hollow, and the inclination angle of the light reflected by the light guide plate toward the back side is reduced under refraction of the glass frame.

[0009] Compared with the prior art, the technical solution of the present invention has the following advantages: In the present utility model, two lamp bead mechanisms are arranged at the same position on the surface of the glass plate, the two lamp bead mechanisms are distributed symmetrically up and down, the two lamp bead mechanisms are bonded and fixed by PVB glue on their back sides, the PVB glue bonds the opening plates of the lamp bead mechanisms on the back side corresponding to the upper end of the opening plate, so that the two lamp bead mechanisms reversely form a display state on the upper and lower sides, forming a double-sided display effect, and solving the problem that a glass material is required for isolation and fixation between the two lamp bead mechanisms, avoiding complicated structure and preventing excessive thickness of the double-sided irradiation structure.

[0010] In this invention, the side edge of the light guide plate reflects the emitted light from the LED chip to the back. When the reflected light shines on the back, it is reflected onto the upper layer of the glass frame. When the light is reflected downward by the glass frame, it passes through the lower layer of the glass frame and undergoes a certain amount of refraction, forming downward vertical light. At this time, the light reflected from the edge of the light guide plate shines on the glass plate below in a parallel state. The light guide plate diffuses the irradiated light parallel and evenly to the entire glass plate, so that most of the light shines downward in a parallel manner, providing a uniform surface light source and avoiding the problem of cross-shaped dark areas formed by emitted light. Attached Figure Description

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0012] Figure 1 This is an overall drawing of the present utility model.

[0013] Figure 2 This is a side view of the LED bead mechanism.

[0014] Figure 3 This is a side view of the display mechanism.

[0015] Figure 4 This is a three-dimensional schematic diagram of the electrode pins.

[0016] In the diagram: Electrode lead-1, Glass plate-2, Lamp bead mechanism-3, Electrode connector-4, Display mechanism-31, Light guide structure-32, Electrode pin-33, Encapsulating colloid-34, Conductive circuit-35, Glass frame-311, Light guide plate-312, Thermal conductive substrate-313, Pin wire-314, LED chip-315, First conductive plate-41, Second conductive plate-42, Opening plate-43. Detailed Implementation

[0017] like Figures 1 to 4 As shown, this utility model proposes an LED screen backlight lamp bead structure, including electrode leads 1, glass plate 2, lamp bead mechanism 3 and electrode connector 4. There are two electrode leads 1, and the electrode connector 4, which is attached to the surface of the glass plate 2, is electrically connected between the two electrode leads 1. The lamp bead mechanism 3 is arrayed on the surface of the glass plate 2, and the arranged lamp bead mechanism 3 is divided into multiple groups and connected in parallel between the two electrode leads 1. The outer end of the electrode connector 4 is connected to an external power supply through a wire, and the power supply controls the lamp bead mechanism 3 connected in parallel between the electrode leads 1 to display images. The lamp bead mechanism 3 is provided with a display mechanism 31, a light guide structure 32, an electrode pin 33, an encapsulating colloid 34 and a conductive circuit 35. The conductive circuit 35 connects two adjacent electrode pins 33 in series on the surface of the glass plate 2. The display mechanism 31 is horizontally fixed between the two electrode pins 33, the light guide structure 32 and the encapsulating colloid 34 which are stacked in sequence are placed downward of the display mechanism 31, and the display mechanism 31 is fixed on the surface of the glass plate 2 through the encapsulating colloid 34 at the lowermost end. The electrode lead 1 is electrically connected to the inside of the display mechanism 31 through the conductive circuit 35 and the electrode pin 33, and forms a closed loop, so that the display mechanism 31 emits irradiation light downward; The display mechanism 31 is provided with a glass frame 311, a light guide plate 312, a heat conducting substrate 313, a pin wire 314 and an LED chip 315. The heat conducting substrate 313 is fixed inside the glass frame 311, the LED chip 315 is fixed at the lower end of the heat conducting substrate 313, and the light emitting surface of the LED chip 315 faces the direction of the light guide plate 312. The pin wire 314 is arranged inside the glass frame 311, and the pin wire 314 electrically connects the LED chip 315 and the electrode pin 33. The pin wire 314 and the LED chip 315 are electrically connected through the electrode pin 33, so that the LED chip 315 emits irradiation light downward. The light guide plate 312 is fixed at the lower end of the glass frame 311, the light guide plate 312 abuts against the surface of the light guide structure 32, and the inner side of the light guide plate 312 is an arc-shaped structure. The irradiation light emitted by the LED chip 315 is reflected out of the pin wire 314 through the light guide plate 312, and irradiates toward the back side of the LED chip 315.

[0018] Wherein, the electrode pin 33 is composed of a first conductive plate 41, a second conductive plate 42 and an opening plate 43. The first conductive plate 41 is fixed on the surface of the glass plate 2, the first conductive plate 41 and the second conductive plate 42 are in a "square-ring" shape, the opening plate 43 is located at the inner position of the second conductive plate 42, and the opening plate 43 is an inverted "concave" structure. The concave part corresponds to the outer end of the glass frame 311, so that the pin wire 314 in the glass frame 311 correspondingly abuts in the opening plate 43. The lower end of the first conductive plate 41 is fixed on the surface of the glass plate 2, and the side surface of the first conductive plate 41 is electrically connected to the conductive circuit 35. A hollow structure is formed between the second conductive plate 42 and the first conductive plate 41, and the irradiation light reflected by the light guide plate 312 irradiates toward the back side through the hollow structure.

[0019] Wherein, the irradiation of the LED chip 315 is divergent irradiation, and the light is emitted from the LED chip 315 in an inclined shape. When being reflected on the arc-shaped light guide plate 312, the light near the edge of the light guide plate 312 is reflected and then irradiates toward the direction of the glass frame 311 on the back side of the LED chip 315.

[0020] The heat-conducting substrate 313 is hollow, which dissipates heat from the LED chip 315 fixed at the lower end of the heat-conducting substrate 313. The lead wire 314 is narrow inside the glass frame 311 and extends along both sides of the glass frame 311 to the side of the LED chip 315 for power transmission. This prevents the lead wire 314 from being directly illuminated by light reflection inside the glass frame 311. The glass frame 311 is made of transparent glass, and the upper layer of the glass frame 311 has a certain light-reflecting effect. The glass frame 311 also has a light-refracting effect. Light rays that are obliquely irradiated onto the upper layer of the glass frame 311 are reflected by the upper layer of the glass frame 311 and tend to be vertical. After being refracted at the lower layer of the glass frame 311, they are irradiated vertically downwards. The light reflected from the edge of the light guide plate 312 irradiates from the bottom onto the upper layer of the glass frame 311. Under the reflection and refraction of the glass frame 311, the light is irradiated vertically downwards to the position of the light guide structure 32.

[0021] Furthermore, the light guide structure 32 is made of transparent optical materials such as PMMA or silicone, and contains microlens arrays and light-diffusing particles to ensure uniform light distribution and avoid hot spots and dark areas by cross-illumination of light.

[0022] Furthermore, the ASTM D1003 standard transmittance of encapsulating colloid 34 is >90%, which means that the high transmittance of encapsulating colloid 34 (>90%) and silicone encapsulation provide good heat resistance and UV resistance.

[0023] In this invention, two LED bead mechanisms 3 are provided at the same position on the surface of the glass plate 2. The two LED bead mechanisms 3 are symmetrically distributed vertically, and the two LED bead mechanisms 3 are bonded and fixed together by PVB adhesive on their back sides. The PVB adhesive is bonded to the opening plate 43 on the upper end of the opening plate 43 corresponding to the opening plate 43 in the LED bead mechanism 3 on the back side, so that the two LED bead mechanisms 3 are in opposite directions to form a display state on the upper and lower sides, forming a double-sided display effect. This reduces the problem of needing glass material to isolate and fix the two LED bead mechanisms 3, avoids a more complicated structure, and prevents a large structural thickness for double-sided illumination.

[0024] Furthermore, the first conductive plate 41, the second conductive plate 42, and the opening plate 43 are all made of silver-plated copper, which has good conductivity and solderability. This allows the current from the conductive line 35 to the first conductive plate 41, the second conductive plate 42, and the opening plate 43 to be introduced into the pin line 314. The opening plate 43 is tilted and concave, and the glass frame 311 is correspondingly embedded in the concave shape of the opening plate 43, so that the two heat-conducting substrates 313 on both sides remain parallel and fixed to each other, ensuring that the pin line 314 is stably fixed on the outside of the LED chip 315. The second conductive plate 41 and the first conductive plate 42 are arranged in a U-shape, with a hollow structure in the middle of the U-shape. This allows the light from the edge to shine out to the side from the hollow structure between the first conductive plate 41 and the second conductive plate 42, preventing the light that does not participate in the downward illumination from being trapped inside the lamp bead mechanism 3 and causing excessive temperature.

[0025] Furthermore, each lamp bead mechanism 3 has two electrode pins 33, which are connected in series via conductive lines 35 on the surface of the glass plate 2. Figure 1 As can be seen, each group of LED bead mechanisms 3 is connected in parallel between two electrode leads 1, so that when a single LED bead mechanism 3 is damaged, it will not affect the whole group, and the location of the damaged LED bead mechanism 3 can be found more quickly. The electrode pins 33 support and fix the display mechanism 31 while preventing the light from being blocked at its edges.

[0026] In this invention, the two ends of the electrode connector 4 are connected to the power supply, and the positive and negative terminals of the power supply are connected to the two electrode leads 1 through the electrode connector 4. A closed circuit is formed through the parallel lamp bead mechanism 3, thereby energizing the lamp bead mechanism 3 on the surface of the glass plate 2. The power is then connected from the conductive line 35 to the display mechanism 31 in the middle of the electrode pin 33. The display mechanism 31 then emits light downward to form a parallel illumination effect. The downward light is evenly distributed downward through the light guide structure 32 to avoid the light from focusing or scattering to form hot spots and dark areas.

[0027] In this invention, since the illumination from the LED chip 315 is divergent, the light is emitted from the LED chip 315 at an angle. When reflected on the arc-shaped light guide plate 312, the light from the side of the LED chip 315 is reflected at the edge of the light guide plate 312 and illuminates the glass frame 311. According to the law of reflection, the arc-shaped light guide plate 312 reflects the incident light at a certain angle along the tangent direction. Under the reflection of the arc-shaped light guide plate 312, the light reflected between the display mechanisms 31 illuminates each other at a certain angle to the back between the intervals of the lamp bead mechanisms 3. The light reflected between the display mechanisms 31 does not cross and converge, so that most of the light that cannot penetrate the light guide plate 312 illuminates the back glass frame 311 and, after being reflected by the upper layer of the glass frame 311, illuminates vertically downward. Thus, the light is evenly and parallelly illuminating the glass plate 2, preventing the formation of dark areas due to divergent light illumination.

[0028] In this invention, the side edge of the light guide plate 312 reflects the emitted light from the LED chip 315 to the back. When the reflected light shines on the back, it is reflected onto the upper layer of the glass frame 311. When the light is reflected downward by the glass frame 311, it passes through the lower layer of the glass frame 311 and undergoes a certain refraction to form downward vertical light. At this time, the light reflected from the edge of the light guide plate 312 shines on the glass plate 2 in a parallel state. The light guide plate 312 spreads the irradiated light parallel and uniformly to the entire glass plate 2, so that most of the light shines downward in a parallel manner, providing a uniform surface light source and avoiding the problem of cross-shaped dark areas formed by emitted light.

[0029] Furthermore, the two symmetrical LED bead mechanisms 3 each have a glass plate 2 on their upper and lower sides. The glass plate 2 is a liquid crystal structure. Under voltage, the glass plate 2 can control the passage of light. Unlike the convex lens with its two convex arc-shaped surfaces, the light guide plate 312 only has one arc shape. It cannot focus the light source for projection, but it can reflect and refract the divergent light emitted by the LED chip 315 at a certain angle, forming a parallel light emission state. Under voltage, the glass plate 2 can control the passage of light, ultimately forming an image, achieving more precise regional light control and improving contrast.

[0030] The above description is only a preferred embodiment of the present utility model, and therefore cannot be used to limit the scope of the present utility model. All equivalent changes and modifications made in accordance with the scope of the present utility model patent and the contents of the specification should still fall within the scope of the present utility model.

Claims

1. An LED screen back lighted lamp bead structure, characterized in that, It comprises electrode leads, a glass plate, lamp bead mechanisms and electrode connectors, wherein there are two electrode leads, the electrode connector attached to the surface of the glass plate is electrically connected between the two electrode leads, the lamp bead mechanisms are distributed in an array on the surface of the glass plate, and the arranged lamp bead mechanisms are divided into multiple groups connected in parallel between the two electrode leads, the outer end of the electrode connector is connected to an external power source through an electric wire, and the power source controls the parallel lamp bead mechanisms between the two electrode leads to emit light; The lamp bead mechanism is provided with a display mechanism, a light guide structure, electrode pins, an encapsulating colloid and a conductive circuit, the conductive circuit connects two adjacent electrode pins in series on the surface of the glass plate, the display mechanism is horizontally fixed between the two electrode pins, the conductive circuit, the light guide structure and the encapsulating colloid stacked in sequence are placed downward of the display mechanism, and are fixed on the surface of the glass plate through the encapsulating colloid at the bottommost end, the electrode leads are electrically connected into the display mechanism through the conductive circuit and the electrode pins, and form a closed loop, so that the display mechanism emits irradiation light downward; The display mechanism is provided with a glass frame, a light guide plate, a heat conducting substrate, pin wires and an LED chip, the heat conducting substrate is fixed inside the glass frame, the LED chip is fixed at the lower end of the heat conducting substrate, the light emitting surface of the LED chip faces the direction of the light guide plate, the pin wires are arranged inside the glass frame, the pin wires are electrically connected with the LED chip and the electrode pins, the electrode pins electrically connect the pin wires and the LED chip, so that the LED chip emits irradiation light downward, the light guide plate is fixed at the lower end of the glass frame, the light guide plate abuts against the surface of the light guide structure, the inner side of the light guide plate is of an arc-shaped structure, the irradiation light emitted by the LED chip is reflected out of the pin wires through the light guide plate, and irradiates towards the back direction of the LED chip.

2. The LED screen back light bead structure according to claim 1, characterized in that, The electrode pin is composed of a first conductive plate, a second conductive plate and an opening plate, the first conductive plate is fixed on the surface of the glass plate, the first conductive plate and the second conductive plate are in a shape of a "hui" (loop-shaped) structure, the opening plate is located at the inner position of the second conductive plate, the opening plate is an inverted "concave" structure, the "concave" shape corresponds to the outer end of the glass frame, so that the pin wire in the glass frame correspondingly abuts in the opening plate, the lower end of the first conductive plate is fixed on the surface of the glass plate, the side surface of the first conductive plate is electrically connected with the conductive circuit, a hollow structure is formed between the second conductive plate and the first conductive plate, and the irradiation light reflected by the light guide plate irradiates towards the back side through the hollow structure.

3. The LED screen back light bead structure according to claim 2, characterized in that, The irradiation of the LED chip is divergent irradiation, the light is emitted from the LED chip in an inclined shape, when reflected on the arc-shaped light guide plate, the light near the edge of the light guide plate is reflected and then irradiates towards the back direction of the LED chip.

4. The LED screen back light bead structure according to claim 3, characterized in that, The interior of the heat conducting substrate is hollow, and the inclination angle of the light reflected by the light guide plate towards the back side is reduced under the refraction of the glass frame.

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