WO2020147517A1 - Led显示屏幕 - Google Patents

Led显示屏幕 Download PDF

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Publication number
WO2020147517A1
WO2020147517A1 PCT/CN2019/127267 CN2019127267W WO2020147517A1 WO 2020147517 A1 WO2020147517 A1 WO 2020147517A1 CN 2019127267 W CN2019127267 W CN 2019127267W WO 2020147517 A1 WO2020147517 A1 WO 2020147517A1
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WO
WIPO (PCT)
Prior art keywords
light
led
reflective
emitting element
led light
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Application number
PCT/CN2019/127267
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English (en)
French (fr)
Inventor
张贤鹏
王霖
姜茹
李屹
Original Assignee
深圳光峰科技股份有限公司
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Publication of WO2020147517A1 publication Critical patent/WO2020147517A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes

Definitions

  • the utility model relates to an LED display screen, which belongs to the technical field of LED display screen manufacturing.
  • LED display screens have the advantages of high brightness, high contrast, and energy saving. With the continuous maturity of related technologies, their application fields and scale are also growing. Some manufacturers have successively introduced LED matrix displays to present high-quality images, such as Samsung’s Cinema LED Screen and Sony’s Crystal display. LED large-screen display has gradually entered the field of high-quality video projection, and with the continuous maturity of technology, it can gradually meet the needs of indoor displays above 100 inches and even cinema viewing. It can be expected that the application scenarios of LED large-screen displays will continue expand.
  • each pixel can be clearly observed on the entire screen, which affects the viewing effect. This is caused by the low light fill rate and large spacing of LEDs.
  • the light on each LED lamp bead (equivalent to one pixel) is too concentrated on the LED lamp bead at the center
  • the distance between adjacent LEDs is too large relative to the LED lamp beads, which makes the light fill rate of the pixels very low, resulting in a poor viewing experience with obvious graininess during viewing.
  • Fig. 1a and Fig. 1b are schematic diagrams of light intensity pixelized distribution of a one-dimensional LED array.
  • the peak luminous intensity will be projected on the retina of the human eye, causing discomfort to the human eye.
  • Reducing the LED pitch to the size of the human eye can ease the pixelated viewing experience to a certain extent, but it will greatly increase the product cost; and increasing the LED light-emitting area not only increases the energy consumption, but also increases the package size. Difficulty.
  • the optical diffusion film K is arranged in front of the LED array S, which can effectively average the light intensity distribution in each pixel area, which is equivalent to redistributing the light intensity emitted by the LED array by the optical diffusion film to make the optical diffusion
  • the light emitted by the film is used as the redistributed secondary light source.
  • the light imaged in the human eye is the light intensity distribution of the secondary light source averaged through the light diffusion film.
  • the light intensity distribution after the average light diffusion film is The fill rate is greater than the fill rate of the light intensity distribution directly emitted by the LED, so it can solve the problem of viewing graininess.
  • the redistribution effect of the optical diffusion film on the light is related to the distance between the optical diffusion film and the LED matrix, that is, the greater the distance between the optical diffusion film and the LED matrix, the greater the optical diffusion film’s impact on the light.
  • the better the average effect the optical diffusion film did not bring about the problem of light crosstalk in the early stage
  • the technical problem to be solved by the utility model is to solve the shortcomings of the prior art, and provide an LED display screen, through the side-illuminated LED light-emitting elements and reflective parts, so that all the light emitted by the side-side LED light-emitting elements pass through the reflector.
  • the reflective surface on the component is directed toward the audience after one or more reflections, so that the distribution of the light beam is more consistent, and the color uniformity of the LED display screen is significantly improved.
  • An LED display screen includes: a main board, the main board includes a plurality of pixel units distributed in an array; each of the pixel units includes a support plate and a reflective component connected to the main board; one side of the support plate is provided with For an LED light-emitting element that emits light on a side surface, a reflective surface is provided on the side of the reflective member opposite to the LED light-emitting element; the light emitted by the LED light-emitting element is reflected by the reflective surface of the opposite reflective member and then emitted .
  • the reflecting surface of the reflecting component is a parabolic surface, a curved surface or a 45° inclined surface.
  • a groove is provided on one side of the support plate, and the LED light-emitting element is arranged in the groove.
  • the surface of the groove is provided with a light reflecting material for reflecting the emitted light of the LED light-emitting element.
  • the support plate further includes a reflective structure for reflecting the large-angle light emitted from above the LED light-emitting element, and the reflective structure and the LED light-emitting element are arranged on the same side of the support plate.
  • the reflective structure is arranged above the LED light emitting element.
  • a surface of the reflective structure facing the LED light-emitting element is provided with a light reflective material
  • a surface of the reflective structure facing the light-emitting surface is provided with a light absorbing material
  • the LED light-emitting element is arranged on one side of the supporting board and an end close to the main board.
  • the outer surface of the support plate except for the position of the LED light-emitting element is provided with a reflective material in other areas.
  • the surface of the main board facing the light emitting surface is provided with a reflective material.
  • the LED display screen In order to increase the viewing area and angular uniformity of the LED pixels, it also includes a diffusion film arranged on the light-emitting surface of the LED display screen.
  • the LED light-emitting element includes red, green and blue LED light-emitting chips; or, the LED light-emitting element includes an LED light-emitting chip for emitting blue light, a blue LED chip for emitting green light, and wavelength conversion Materials, blue LED chips and wavelength conversion materials for emitting red light.
  • the present invention provides an LED display screen. Through the side-emitting LED light-emitting elements and reflective parts, all the light emitted by the side-emitting LEDs passes through the reflective surface provided on the reflective part once or more. After the second reflection, it is directed to the audience, so that the distribution of the light beam is more consistent, and the color uniformity of the LED display screen is significantly improved.
  • Fig. 1a and Fig. 1b are respectively schematic diagrams of light intensity pixelized distribution of a one-dimensional LED array
  • Figure 2 is a partial schematic diagram of the LED display screen of the first embodiment of the present invention.
  • Figure 3 is a schematic diagram of a partial structure of a supporting plate in the second embodiment of the utility model
  • Fig. 5 is a partial schematic diagram of the LED display screen of the third embodiment of the utility model
  • FIG. 6 is a partial schematic diagram of the LED display screen of the fourth embodiment of the present invention.
  • Figure 7 is a schematic diagram of the structure of the reflective component and support plate of the present invention.
  • Figure 8 is a schematic diagram of the structure of the reflective component of the present invention.
  • FIG. 9 is a partial schematic diagram of the LED display screen of the fifth embodiment of the present invention.
  • FIG. 10 is a partial schematic diagram of the LED display screen of the sixth embodiment of the present invention.
  • FIG. 11 is a schematic diagram of the pixel illumination distribution of the LED display screen with a parabolic structure reflecting part of the present invention.
  • the technical problem to be solved by the utility model is to address the shortcomings of the prior art, and provide an LED display screen.
  • the side-emitting LED light-emitting elements and reflective parts all the light emitted by the side-emitting LEDs passes through the reflective parts.
  • the reflective surface on the upper surface is directed toward the audience after one or more reflections, so that the distribution of the light beam is more consistent, and the color uniformity of the LED display screen is significantly improved.
  • the present invention provides an LED display screen, including a main board, and the main board includes a plurality of pixel units distributed in an array.
  • Each of the pixel units includes a support plate and a reflective part electrically connected to the main board; one side of the support plate of the pixel unit is provided with an LED light-emitting element for side light emission, and the other adjacent pixel
  • the reflecting part of the unit is provided with a reflecting surface on the opposite side of the LED light emitting element; the light emitted by the LED light emitting element is reflected by the reflecting surface of the opposite reflecting part and then emitted.
  • the reflective member is connected to the side surface of the support plate of the adjacent pixel unit by bonding; or, the reflective member and the support plate of the adjacent pixel unit are integrally formed. Since the support plate is connected to the reflective part of the adjacent pixel unit, in order to facilitate the description of the structural relationship between the support plate and the reflective part, the support plate and the reflective part of the adjacent pixel unit will be described as a whole in the following description; the support plate can be The bottom surface of the reflective part is flush, and both are directly connected to the main board at the same time, and there are contact points on the main board that are connected to the lead; or, the support plate may not be flush with the bottom surface of the reflective part.
  • the bottom surface is directly connected with the main board, the bottom of the support plate is reserved with contact solder points, and the support plate is connected with the lead through the contact solder points.
  • a diffusion film is also provided above the reflective component.
  • the bottom surface of the reflective component is much larger than the bottom surface of the support plate
  • the bottom surface of the reflective component mainly serves to fix the LED light-emitting element; when the bottom surface of the support plate and the reflective component are not flush, the reflective component is connected to the main board through the bottom surface, and the support plate
  • An electrical contact point is provided on the bottom surface corresponding to the main board, and the lead wire of the LED light-emitting element is electrically connected to the main board.
  • the bottom surface of the reflective component is much larger than the bottom surface of the support plate, when the reflective component is connected to the main board, The function of fixing LED light-emitting elements can also be realized.
  • reflective materials or light-absorbing materials are provided on the opposite surface of the main board, the reflective part and the support plate, to reflect or absorb the incident light;
  • the advantage of setting the reflective material on the main board surface is that it can increase the light utilization of the LED light-emitting elements, but also It will increase the reflection of ambient light, which will reduce the contrast of the LED display screen;
  • the advantage of setting light-absorbing materials is that it can increase the absorption of ambient light and further improve the contrast of the LED display screen, but it will also affect the large-angle side of the LED light-emitting element. The luminous light is absorbed, reducing the light utilization rate of the LED light-emitting element.
  • a reflective surface is provided on the first side surface of the support plate except for the LED light-emitting element in other areas, for secondary reflection of light reflected by the reflective surface of the reflective part, and the LED light-emitting element is connected to the circuit board through a lead (not shown in the figure) Show) connection
  • the lead can be arranged inside the support plate or on the surface of the support plate, the lead can be one or more; the support plate can be an existing insulating plate or A circuit board that can be placed on the conductive side.
  • the end of the lead is connected with the main board of the LED display screen, and is used to provide electrical modulation to the LED light-emitting element.
  • the reflective surface of the reflective component may be a parabolic surface, an inclined surface or other curved surface structures, and the specific reflective surface structure depends on the position of the LED light-emitting element on the side surface of the support plate.
  • the LED light-emitting element may be an LED light-emitting element containing light of one primary color, or an LED light-emitting element containing light of three primary colors. In a variant embodiment, the LED light-emitting element may also be an LED light-emitting element containing light of one primary color. Element and light-emitting element of wavelength conversion material.
  • the LED light-emitting element is composed of a combination of a plurality of chip units, and the chip unit is provided with red, green and blue LED light-emitting elements.
  • the arrangement of LED light-emitting elements is not limited to the in-line arrangement of RGB three pixels.
  • the chip unit can be divided into three or four equal parts to prevent For the mutual interference between LED light-emitting elements of different colors, partitions are also arranged between adjacent chips, and the partitions are made of opaque material.
  • the chip unit may also include a red or green LED light-emitting element composed of a blue LED light-emitting element, a corresponding wavelength conversion material and a filter.
  • a red or green LED light-emitting element composed of a blue LED light-emitting element, a corresponding wavelength conversion material and a filter.
  • the specific structure of the chip unit is not limited to the LED light-emitting elements of the three primary colors of red, green and blue, and it can also be that all three chips are blue LED light-emitting elements, and the red (green) is realized by blue LED light-emitting elements and Cover the blue to red (green) wavelength conversion material above, and a red (green) filter is placed above the LED light-emitting element.
  • a shading plate can be arranged between adjacent LED light-emitting elements.
  • the shading plate, the reflective surface of the reflective part and the support plate restrict the light emitted by the LED light-emitting element to one area In the space, only light is allowed to exit from the corresponding audience side exit. On the basis of increasing the uniformity of the emitted light, the optical crosstalk is reduced.
  • Fig. 2 is a partial schematic diagram of the LED display screen in the first embodiment of the present invention.
  • the present invention provides an LED display screen, including a main board 700, the main board 700 includes a plurality of pixel units distributed in an array, each of the pixel units includes a support electrically connected to the main board 700 The board 100 and the reflective member 500.
  • the plurality of pixel units distributed in an array one side of the support plate 100 of one of the pixel units is provided with an LED light emitting element 200 for side light emission, and the reflective part 500 of the adjacent other pixel unit and the LED emit light.
  • the opposite side of the element 200 is provided with a reflective surface 510. The light emitted by the LED light-emitting element 200 is reflected by the opposite reflective surface 510 of the reflective component 500 and then emitted.
  • the supporting plate 100 and the reflective component 500 are bonded together, and the bottom surfaces of the supporting plate 100 and the reflective component 500 are flush, and the bottom surfaces of both are connected to the main board 700 at the same time.
  • the LED display screen further includes a lead 300, one end of the lead 300 is connected to the LED light-emitting element 200, and the other end is connected to the main board 700 of the LED display screen for electrical connection of the LED light-emitting element.
  • the LED light-emitting element 200 is fixed on the surface of the support plate 100.
  • the LED light-emitting element 200 is arranged in the middle of the outer surface of the support plate 100.
  • the side surface of the support plate 100 is provided with a reflective surface in other areas except the LED light-emitting elements.
  • the outer surface of the support plate except for the LED light-emitting element is provided in other areas A reflective surface is provided; the outer surface of the main board is provided with a reflective surface.
  • a display motherboard 700 is provided with a plurality of pixel units distributed in an array.
  • the LED light-emitting elements in the pixel unit on the left side of the figure The side light emitted by 200 is reflected on the reflective surface 510 of the reflective component 500 in the adjacent pixel unit and then emitted.
  • the light L1 is reflected by the reflective surface 510 of the adjacent reflective member 500 and then hits the reflective surface of the support plate 100. After being reflected by the reflective surface of the support plate 100, the light is directed toward the audience.
  • the light L2 is reflected by the reflective surface of the reflective member 500 of the adjacent pixel unit and then directed toward the reflective surface of the self-supporting plate 100, and then reflected by the reflective surface of the self-supporting plate 100 and then directed toward the adjacent pixel unit
  • the reflective surface of the reflective component 500 is reflected again by the reflective surface and then directed toward the audience.
  • the light is emitted after three reflections; the light L3 is only reflected by the reflective surface of the reflective component of the adjacent pixel unit and then directed toward the audience; the light L4 After being reflected by the main board 700, it is projected to the reflective surface of the reflective component 500 of the adjacent pixel unit, and is projected to the audience after being reflected by the reflective surface.
  • the side-emitting LED light-emitting unit needs to be reflected one or more times on the reflective surface of the reflective component or the supporting plate, the area enclosed by the reflective surface of the reflective component and the reflective surface of the supporting plate is equivalent to an optical integral
  • the rod homogenizes the light of the LED light-emitting element, so it can significantly improve the color uniformity of the LED display screen.
  • the LED light-emitting element at this time emits side light, that is, most of the light of the LED light-emitting element exits toward the side of the support plate, and the non-prior art flat panel display LED light exits vertically upwards .
  • the LED light-emitting element at this time may be an LED light-emitting element containing light of one primary color, or an LED light-emitting element containing light of three primary colors.
  • the LED light-emitting element may also contain one A kind of primary color LED light-emitting element and wavelength conversion material light-emitting element.
  • the reflective component 500 is an emitting surface including a parabolic structure, and the parabolic reflecting surface is used to reflect the light emitted from the side surface of the adjacent LED light emitting element.
  • the LED light-emitting element is composed of a combination of multiple chip units, and the chip unit is equipped with red, green and blue LED light-emitting elements.
  • red, green and blue LED light-emitting elements can also be provided.
  • Light-emitting element the arrangement of LED light-emitting elements is not limited to the in-line arrangement of RGB three pixels.
  • the chip unit can be divided into three or four equal parts to prevent For the mutual interference between LED light-emitting elements of different colors, partitions are also arranged between adjacent chips, and the partitions are made of opaque material.
  • the chip unit may also include a red or green LED light-emitting element composed of a blue LED light-emitting element, a corresponding wavelength conversion material and a filter.
  • a red or green LED light-emitting element composed of a blue LED light-emitting element, a corresponding wavelength conversion material and a filter.
  • the specific structure of the chip unit is not limited to the LED light-emitting elements of the three primary colors of red, green and blue, and it can also be that all three chips are blue LED light-emitting elements, and the red (green) is realized by blue LED light-emitting elements and Cover the blue to red (green) wavelength conversion material above, and a red (green) filter is placed above the LED light-emitting element.
  • a shading plate can be arranged between adjacent LED light-emitting elements.
  • the shading plate, the reflective surface of the reflective part and the support plate restrict the light emitted by the LED light-emitting element to one area In the space, only light is allowed to exit from the corresponding audience side exit. On the basis of increasing the uniformity of the emitted light, the optical crosstalk is reduced.
  • Fig. 3 is a schematic diagram of the partial structure of the supporting plate in the second embodiment of the present invention.
  • the LED light emitting element 200 can be arranged on the surface of the support plate 100, or the support plate 100 can be used to dig a groove 800, and the groove 800 is arranged inside the support plate 100, but when it is arranged inside, it is embedded The depth of the support plate 100 needs to be set in accordance with the light extraction efficiency.
  • the groove 800 formed on the supporting plate 100 is trumpet-shaped.
  • those skilled in the art can also choose the shape of the groove 800 according to actual needs, for example, it can also be square, rectangular, or round. Or fan shape and so on.
  • a light reflecting material is formed on the surface of the horn-shaped groove to reflect incident light.
  • the effect of the embedded groove is described below; first, the side-emitting LED light-emitting element of the first embodiment In the generated beam, part of the large-angle light on the upper side is not reflected by the reflective surface of the reflective part, but is directly emitted. The directly emitted light is not reflected by the reflective surface for homogenization, so it will affect the uniformity of the emitted light Degree; and the embedded design of the LED light-emitting element of the second embodiment can well solve the problem of direct emission of large-angle light.
  • the large-angle light emitted by the LED light-emitting element of the second embodiment is reflected by the reflective material on the groove surface and then passes through the reflective part
  • the reflective surface of 500 emits, so that all the light emitted by the LED light-emitting element is uniformly emitted at least once, which further improves the light uniformity of the LED display.
  • Fig. 4 is a partial schematic diagram of the LED display screen of the second embodiment of the present invention.
  • the arrangement of the LED light-emitting element 200 in the support plate is different from that in the first embodiment, the bottom of both the support plate 100 and the reflective member 500 They are not flush with each other, the reflective component is directly connected to the main board 700, and contact solder joints are reserved between the bottom of the support board 100 and the main board 700, and the support board is connected to the lead 300 through the contact solder joints.
  • the light rays L5, L6, and L7 emitted by the LED light-emitting element 200 are emitted after being reflected one or more times by the adjacent reflecting member 500 and the supporting plate 100, respectively.
  • the light L5 has been reflected twice by the reflective component
  • L6 has only been reflected once by the reflective component
  • the light L7 has been reflected once by the reflective component and the supporting plate.
  • Fig. 5 is a partial schematic diagram of the LED display screen of the third embodiment of the present invention. As shown in FIG. 5, there are two adjacent pixel units. When the LED light-emitting element 200 is placed in the middle of the support plate 100 of one of the pixel units, the light La emitted from it is along the support plate of the adjacent pixel unit. The top of the 100 shoots out directly without any reflection, which will result in poor uniformity.
  • the other LED light-emitting element in FIG. 5 is arranged at a position close to the bottom of the support plate 100. The light Lb whose exit angle is exactly the same as that of the light La.
  • Fig. 6 is a partial schematic diagram of the LED display screen of the fourth embodiment of the present invention.
  • the reflective component 500 uses a 45° reflective surface
  • the LED light-emitting element 200 is packaged integrally with the 45° reflective surface, and the reflective surface and the LED element are welded together or separately mounted. Due to the 45° reflecting surface, the reflection direction of the light will be different from that of the arc uniform cup. Regardless of the reflection direction of the light, the light emitted from the LED light-emitting element 200 is emitted to the audience after being reflected one or more times. As shown in Fig.
  • the light rays L13 and L14 respectively exit from the LED light emitting element 200, and exit after being reflected twice and once by the reflecting surface and the supporting plate. That is, homogenizing the light of the LED light-emitting element can significantly improve the color uniformity of the LED display screen.
  • Fig. 7 is a partial schematic diagram of the LED display screen of the fifth embodiment of the present invention. As shown in FIG. 7, this embodiment is an improved structure based on the above-mentioned embodiment. Specifically, a reflection structure 900 is added on the basis of the above-mentioned four embodiments and their modified structures. From the light reflection paths in the aforementioned four embodiments, it can be seen that a part of the upper side of the LED light emitting element emits light at a large angle, which is not reflected by the reflective component or is emitted after a single reflection, which will result in a poor uniform light effect.
  • a reflective structure 900 is provided on the upper side of the light emitting element 200 of the LED light emitting element 200, and the height of the reflective structure 900 is to completely block the directly emitted light.
  • the reflective structure 900 can prevent the light whose exit angle is greater than L15 from directly exiting, and the propagation and reflection direction of the light can be changed by the reflection of the reflective structure 900.
  • the light L16 in Figure 7 has a reflection effect on the reflective structure 900. Next, it passes through the adjacent reflective parts, its own support plate, and the adjacent reflective parts respectively, and exits after four reflections. The light is reflected multiple times, which increases the light uniformity of the LED display.
  • the reflective structure 900 is provided with a light-reflecting material on the surface of the reflective structure 900 facing the LED light-emitting element for reflecting incident light.
  • the reflective structure faces the side surface of the LED light-emitting element, that is, the reflective structure faces
  • One side surface of the light-emitting surface is provided with a light-absorbing material for absorbing the incident ambient light to improve the contrast of the LED display screen.
  • Fig. 8 is a partial schematic diagram of the LED display screen of the sixth embodiment of the present invention.
  • the support plate 100 and the reflective component 500 are integrated and packaged.
  • a diffusion film 600 is also provided above the reflective member.
  • the diffusion film 600 is provided with light scattering particles or other microstructures on the surface or inside, such as a rough surface obtained after frosting, which increases the viewing area and angular uniformity of the LED pixels, and improves the continuity of the pixels.
  • the diffusion film is not limited to be used in this embodiment, but is also applicable to the above-mentioned Embodiment 1 to Embodiment 5, and the installation positions are all located above the reflective component.
  • the lead 300 is connected to the pin 400, and the pin 400 is welded and fixed on the welding layer 110 of the support board 100 through a pad 410, and the welding layer 110 includes a pad for fixing the LED device.
  • the pin 400 is arranged under the reflective component.
  • the vertical surface of the pin 400 is coated with a black absorption layer 420 outside the light-emitting area. Since the vertical surface of the package (that is, the plane where the LED is located) and the packaging material are blackened, for ambient light, after entering the pixel unit of the display, the reflected light will be absorbed by the blackened surface, even if the reflective cup surface is used The higher reflectivity or even the mirror surface will not affect the audience and affect the contrast.
  • the pins not only serve as a counterweight, maintain the vertical welding of the LED light-emitting elements and the stability in the process engineering, but are also buried under the reflective component, so that the reflected ambient light will not affect the contrast.
  • the processing process of this embodiment is as follows: the LED light-emitting element 200 is welded to the lead 300, and drawn from the same side of the support board 100 and connected to the pin 400, so that the lead 300 and the pin 400 are 90° °Included angle; the soldered LED light-emitting element 200 and the reflective component, namely: the reflective component 500, are combined and installed, and the pin 400 is buried under the reflective component 500.
  • the combined installation includes integrated packaging.
  • the vertical pins and the reflective structure are used to maintain the balance of the center of gravity during the welding process of the side-emitting LED.
  • the reflective component 500 and the support plate 100 can be integrated and packaged.
  • the LED light-emitting element 200 and the homogenization cup are packaged as an integrated package, and both are placed on the pads and undergo reflow soldering.
  • the homogenization cup improves the stability of vertical placement during soldering.
  • the welding process guarantees that the counterweight method of Fangguang distribution allows the device to stand on the PCB sideways and pass the process test.
  • the reflective component can also be directly fixed on the welding layer 110 of the support plate 100, and is not integrated with the support plate 100, and there is a space between the installation positions of the two.
  • the LED components are soldered first, and then combined with the homogenization cup.
  • the homogenization cup has a thinner upper wall to increase the filling rate.
  • FIG. 9 is a schematic diagram of the structure of the reflective component and the support plate of the present invention.
  • the reflective component 500 is a homogenization cup.
  • the edge shape of the homogenization cup in the Z direction is a parabola.
  • the three-dimensional shape formed is straight in the X and Y directions, and
  • the Z direction is a curved surface, and a reflective surface is provided on the curved surface.
  • the light rays L11 and L12 emitted from the LED light-emitting element 200 are respectively emitted after being reflected by the adjacent reflecting member and its own supporting plate.
  • Figure 10 is a schematic diagram of the structure of the reflective component of the present invention.
  • the homogenization cup shown in Fig. 10 is an improvement based on the structure shown in Fig. 6.
  • the difference between the two is that the shape of the homogenization cup shown in Fig. 7 in the X direction and the Z direction are both parabolic. With the above structure, the reflection angle of light can be more diverse.
  • Fig. 11 is a schematic diagram of the pixel illumination distribution of the LED display screen with a parabolic structure reflecting part of the present invention. It can be seen from Figure 11 that when the LED display uses side-emitting LED light-emitting elements, and the light emitted by the LED of the LFA display is reflected by the reflective part, the uniformity of the illuminance distribution is greatly improved, and the pixel filling rate can be close to 100% , And the intensity uniformity of the chip's luminescence is greatly improved, which solves the graininess of the display screen.
  • the present invention provides an LED display screen. Through the side-emitting LED light-emitting elements and reflective parts, all the light emitted by the side-emitting LEDs passes through the reflective surface provided on the reflective part once or more. After the second reflection, it is directed to the audience, so that the distribution of the light beam is more consistent, and the color uniformity of the LED display screen is significantly improved.

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Abstract

一种LED显示屏幕，包括：主板（700），主板（700）包括多个阵列分布的像素单元；每个像素单元包括与主板（700）连接的支撑板（100）和反射部件（500）；支撑板（100）的一侧设有用于侧面发光的LED发光元件（200），反射部件（500）与LED发光元件（200）相对的一侧设有反射面（510）；LED发光元件（200）发出的光线通过相对的反射部件（500）的反射面（510）反射后射出。通过侧面发光的LED发光元件（200）和反射部件（500），使得侧面发光的LED发光元件（200）所发出的全部光线都通过设置在反射部件（500）上的反射面（510）经过一次或多次反射后射出，从而使得光束的分布更加一致，显著改善LED显示屏幕的颜色均匀性。

Description

LED显示屏幕 技术领域
本实用新型涉及一种LED显示屏幕，属于LED显示屏幕制造技术领域。
背景技术
LED显示屏幕具有高亮度、高对比度和节能等优点，随着相关技术的不断成熟，其应用领域和规模也不断增长。一些厂商相继推出了LED矩阵显示屏用以呈现高质量影像，例如：三星的Cinema LED Screen和索尼的Crystal显示屏。LED大屏幕显示已经逐渐进入高质量视频放映领域，并且随着技术的不断成熟，逐步可以满足100寸以上室内显示乃至院线观影的需求，可以预料到LED大屏幕显示的应用场景会不断地扩大。
然而，目前LED大屏幕显示还存在一些问题。LED显示屏在放映高清影像时，整个画面可以清楚地观察到每个像素点，影响了观影效果。这是LED的低光线填充率和大间距共同导致的。例如：由于LED灯珠的发光强度很高，对于通过集合LED灯珠而形成的显示屏而言，每一LED灯珠(相当于一像素)上的光线过于集中在位于中心处的LED灯珠上，而相邻的LED的间距相对于LED灯珠本身太大，使得像素的光线填充率很低，造成观看时颗粒感明显的不良观影体验。
图1a和图1b分别为一维LED阵列的光强像素化分布示意图。如图1a所示，对于像素点而言，由于亮度集中在中心区域，峰值发光强度会投射到人眼视网膜上，从而造成人眼不适。减小LED间距到人眼分辨尺寸之下可以在一定程度上缓解像素化的观影体验，但是会极大地增加了产品成本；而增大LED发光面积不仅增加了能耗，也增加了封装的难度。
如图1b所示，在LED阵列S前布置光学扩散膜K，可以有效地平均每个像素区域内的光强分布，相当于光学扩散膜对LED阵列出射的光 强进行重新分布，使得光学扩散膜出射的光作为重新分布后的二次光源，此时成像在人眼中的光是经过光扩散膜平均后的二次光源的光强分布，很显然经过光学扩散膜平均后的光强分布的填充率是大于LED直接出射的光强分布的填充率，因此可解决观看颗粒感的问题。但光学扩散膜对光的重新分布效果的好坏是和光学扩散膜与LED矩阵之间的距离的远近有关，即：光学扩散膜与LED矩阵之间的距离越大，光学扩散膜对光的平均效果越好(前期是光学扩散膜未带来光串扰问题)，填充率越高，因此，在实现较好填充率的显示要求时，光学扩散膜与LED矩阵之间的间距过大，造成LED显示屏幕的厚度较大，不利于轻薄化的发展趋势。
实用新型内容
本实用新型所要解决的技术问题在于针对现有技术的不足，提供一种LED显示屏幕，通过侧面发光的LED发光元件和反射部件，使得侧面的LED发光元件所发出的全部光线都通过设置在反射部件上的反射面经过一次或多次反射后射向观众，从而使得光束的分布更加一致，显著改善LED显示屏幕的颜色均匀性。
本实用新型所要解决的技术问题是通过如下技术方案实现的：
一种LED显示屏幕，包括：主板，所述主板包括多个阵列分布的像素单元；每个所述像素单元包括与所述主板连接的支撑板和反射部件；所述支撑板的一侧设有用于侧面发光的LED发光元件，所述反射部件与所述LED发光元件相对的一侧设有反射面；所述LED发光元件发出的光线通过相对的所述反射部件的所述反射面反射后射出。
根据实际结构需要，所述反射部件的反射面为抛物面、曲面或45°斜面。
进一步地，所述支撑板的一侧设有凹槽，所述LED发光元件设置在所述凹槽内。
为了增加光线的反射次数，所述凹槽的表面设有用于对LED发光元件的出射光进行反射的光反射材料。
为了防止光线直接出射，所述支撑板还包括有用于对所述LED发光元件上方出射的大角度光线进行反射的反射结构，所述反射结构和 所述LED发光元件设置在所述支撑板的同一侧，所述反射结构设置在所述LED发光元件的上方。
另外，所述反射结构面对所述LED发光元件的一侧表面设有光反射材料，所述反射结构面对出光面的一侧表面设有光吸收材料。
为了减少直接出射的光线，所述LED发光元件设置于所述支撑板一侧靠近所述主板的一端。
进一步地，所述支撑板的外表面除去所述LED发光元件位置之外的其它区域都设有反射材料。
更进一步地，所述主板面对出光面的表面设有反射材料。
为了增加LED像素的可视面积和角度均匀性，还包括设置于所述LED显示屏幕出光面的扩散膜。
通常情况下，所述LED发光元件包括红色、绿色和蓝色LED发光芯片；或者，所述LED发光元件包括用于出射蓝光的LED发光芯片、用于出射绿光的蓝色LED芯片和波长转换材料及用于出射红光的蓝色LED芯片和波长转换材料。
综上所述，本实用新型提供一种LED显示屏幕，通过侧面发光的LED发光元件和反射部件，使得侧面发光的LED所发出的全部光线都通过设置在反射部件上的反射面经过一次或多次反射后射向观众，从而使得光束的分布更加一致，显著改善LED显示屏幕的颜色均匀性。
下面结合附图和具体实施例，对本实用新型的技术方案进行详细地说明。
附图说明
图1a和图1b分别为一维LED阵列的光强像素化分布示意图；
图2为本实用新型实施例一的LED显示屏幕的局部示意图；
图3为本实用新型实施例二支撑板局部结构示意图；
图4为本实用新型实施例二的LED显示屏幕的局部示意图；
图5为本实用新型实施例三的LED显示屏幕的局部示意图；
图6为本实用新型实施例四的LED显示屏幕的局部示意图；
图7为本实用新型反射部件和支撑板的结构示意；
图8为本实用新型反射部件结构示意图；
图9为本实用新型实施例五的LED显示屏幕的局部示意图；
图10为本实用新型实施例六的LED显示屏幕的局部示意图；
图11为本实用新型具有抛物面结构反射部件的LED显示屏幕像素照度分布示意图。
具体实施方式
本实用新型所要解决的技术问题在于针对现有技术的不足，提供一种LED显示屏幕，通过侧面发光的LED发光元件和反射部件，使得侧面发光的LED所发出的全部光线都通过设置在反射部件上的反射面经过一次或多次反射后射向观众，从而使得光束的分布更加一致，显著改善LED显示屏幕的颜色均匀性。
总体来说，本实用新型提供一种LED显示屏幕，包括：主板，所述主板包括多个阵列分布的像素单元。每个所述像素单元包括与所述主板电性连接的支撑板和反射部件；一个所述像素单元的支撑板的一侧设有用于侧面发光的LED发光元件，相邻的另一个所述像素单元的所述反射部件与所述LED发光元件相对的一侧设有反射面；所述LED发光元件发出的光线通过相对的所述反射部件的所述反射面反射后射出。
在如下不同的实施例中，所述反射部件通过粘接的方式与相邻像素单元的支撑板的侧面连接；或者，所述反射部件与相邻像素单元的支撑板一体成型。由于支撑板和相邻像素单元的反射部件连接，因此为了方便说明支撑板和反射部件的结构关系，后续将支撑板和相邻像素单元的反射部件当做一个整体进行说明；所述支撑板可以与反射部件的底面齐平，两者同时直接与所述主板相连，且主板上有与引线接通的接触点；或者，所述支撑板也可以与反射部件的底面不齐平，所述反射部件的底面与所述主板直接相连，支撑板底部预留有接触焊点，支撑板通过接触焊点与引线接通。为了增加LED像素的可视面积和角度均匀性，提高像素的连续性，所述反射部件的上方还设有扩散膜。
其中由于反射部件的底面远大于支撑板的底面，因此反射部件的底 面主要起固定LED发光元件的作用；当支撑板和反射部件的底面不齐平时，反射部件通过底面与主板连接，支撑板的底面与主板对应的位置设置有电接触点，用于LED发光元件的引线与主板实现电连接，如上所述，由于反射部件的底面远大于支撑板的底面，因此在反射部件与主板连接时，同样可以实现固定LED发光元件的作用。另外主板与反射部件和支撑板相对的表面设置反射材料或吸光材料，用于对入射的光线进行反射或吸收；主板表面设置反射材料的优势在于可增加对LED发光元件的光利用，但同样也会增加对环境光的反射，使得LED显示屏幕的对比度下降；设置吸光材料的优势在于可增加对环境光的吸收，进一步提高LED显示屏幕的对比度，但同样也会对LED发光元件的大角度侧发光光线进行吸收，降低LED发光元件的光利用率。
所述支撑板的第一侧面除LED发光元件的其它区域设置反射面，用于对经反射部件的反射面反射的光线进行二次反射，所述LED发光元件通过一引线与电路板(图未示出)连接，所述引线可以设置在支撑板的内部，也可以设置在支撑板的表面，所述引线可以是一条，也可以是多条；所述支撑板可以为现有的绝缘板或可导电侧面放置的电路板。所述引线的末端与LED显示屏幕的主板连接，用于对LED发光元件提供电调制。
所述反射部件的反射面可以为抛物面、斜面或其它曲面结构，具体的反射面结构视LED发光元件在支撑板的侧面位置而定。
所述LED发光元件可以是包含有一种基色光的LED发光元件，也可以是包含有三基色光的LED发光元件，在一变形实施方式中，LED发光元件也可以是包含有一种基色光的LED发光元件和波长转换材料的发光元件。
所述LED发光元件由多个芯片单元组合而成，所述芯片单元内设有红色、绿色和蓝色三基色LED发光元件，当然，还可以设有白光LED发光元件。另外，LED发光元件排列方式并不局限于RGB三个像素的一字型排列，根据LED发光元件的颜色和设置数量不同，可以在芯片单元中采取三等分或四等分的结构，为了防止不同颜色的LED发光元件之间的相互干扰，还在相邻的芯片之间设置隔板，隔板由不透光材质制成。此外，芯片单元还可以包括由蓝光LED发光元件、相应的波长 转换材料和滤光片构成的红色或绿色LED发光元件。进一步地，芯片单元的具体结构不限于红、绿和蓝三基色的LED发光元件，也可以是三个芯片都为蓝光LED发光元件，其中红色(绿色)的实现方式为蓝色LED发光元件和覆盖在上方的蓝光到红光(绿光)波长转换材料，且在LED发光元件上方放置有红色(绿色)的滤光片。为了防止不同LED发光元件之间的光线串扰，可在相邻的LED发光元件之间设置遮光板，此时遮光板、反射部件的反射面和支撑板将LED发光元件出射的光线限制在一个区域空间内，仅允许光线从对应观众侧的出口出射。在增加出射光均匀性的基础上减少了光串扰。
以下通过具体实施例对本实用新型的技术方案进行详细地说明。
实施例一
图2为本实用新型实施例一的LED显示屏幕的局部示意图。如图2所示，本实用新型提供一种LED显示屏幕，包括主板700，所述主板700包括多个阵列分布的像素单元，每个所述像素单元包括与所述主板700电性连接的支撑板100和反射部件500。在阵列分布的多个像素单元中，其中一个所述像素单元的支撑板100的一侧设有用于侧面发光的LED发光元件200，相邻的另一个所述像素单元的反射部件500与LED发光元件200相对的一侧设有反射面510。所述LED发光元件200发出的光线通过相对的所述反射部件500的所述反射面510反射后射出。
由图2所示可知，在本实施例中，支撑板100与反射部件500粘接在一起，且支撑板100与反射部件500的底面平齐，两者的底面同时与主板700连接。所述LED显示屏幕还包括引线300，所述引线300的一端与LED发光元件200连接，另外一端与LED显示屏幕的主板700连接，用于实现LED发光元件的电连接。LED发光元件200是固定在支撑板100的表面上的，LED发光元件200设置在支撑板100外表面的中间位置，支撑板100的侧面除LED发光元件外的其它区域设置反射面。为了使LED发光元件所发出的全部光线都通过设置在反射部件上的反射面经过一次或多次反射后射出，所述支撑板的外表面除去所述LED发光元件设置位置之外的其它区域都设有反射面；所述主板的外表面 设有反射面。
下面通过具体的光线传播路径对本实用新型的匀光效果进行说明，如图2所示，显示主板700上设有多个阵列分布的像素单元，位于图示左侧的像素单元中的LED发光元件200所发出的侧面光线，在与其相邻的像素单元中的反射部件500的反射面510上发生反射后射出。结合图2所示，光线L1通过相邻的反射部件500的反射面510反射后射向支撑板100的反射面，经过支撑板100的反射面反射后射向观众，此时的光线是经过两次反射后出射的；光线L2通过相邻像素单元的反射部件500的反射面反射后射向自身支撑板100的反射面，通过自身支撑板100的反射面反射后又射向相邻像素单元的反射部件500的反射面，再次经反射面反射后射向观众，此时的光线是经过三次反射后出射；光线L3仅通过相邻像素单元的反射部件的反射面反射后射向观众；光线L4通过主板700的反射后射向相邻像素单元的反射部件500的反射面，通过反射面反射后射向观众。可以理解，由于侧面发光的LED发光单元所发出的全部光线都需要在反射部件或支撑板反射面经过一次或多次反射，反射部件的反射面和支撑板反射面围成区域相当于一个光学积分棒，对LED发光元件的光进行匀光，因此能够显著改善LED显示屏幕的颜色均匀性。
由于LED发光元件设置在支撑板100的侧面，此时的LED发光元件为侧面发光，即LED发光元件的光线大多以朝向支撑板侧面的方向出射，非现有技术的平板显示LED光线垂直向上出射。需要说明的是，此时的LED发光元件可以是包含有一种基色光的LED发光元件，也可以是包含有三基色光的LED发光元件，在一变形实施方式中，LED发光元件也可以是包含有一种基色光的LED发光元件和波长转换材料的发光元件。反射部件500为一包含有抛物面结构的发射面，所述抛物面反射面用于对相邻的LED发光元件侧面出射的光线进行反射。
也就是说，在通常情况下，所述LED发光元件由多个芯片单元组合而成，所述芯片单元内设有红色、绿色和蓝色三基色LED发光元件，当然，还可以设有白光LED发光元件。另外，LED发光元件排列方式并不局限于RGB三个像素的一字型排列，根据LED发光元件的颜色和设 置数量不同，可以在芯片单元中采取三等分或四等分的结构，为了防止不同颜色的LED发光元件之间的相互干扰，还在相邻的芯片之间设置隔板，隔板由不透光材质制成。此外，芯片单元还可以包括由蓝光LED发光元件、相应的波长转换材料和滤光片构成的红色或绿色LED发光元件。进一步地，芯片单元的具体结构不限于红、绿和蓝三基色的LED发光元件，也可以是三个芯片都为蓝光LED发光元件，其中红色(绿色)的实现方式为蓝色LED发光元件和覆盖在上方的蓝光到红光(绿光)波长转换材料，且在LED发光元件上方放置有红色(绿色)的滤光片。为了防止不同LED发光元件之间的光线串扰，可在相邻的LED发光元件之间设置遮光板，此时遮光板、反射部件的反射面和支撑板将LED发光元件出射的光线限制在一个区域空间内，仅允许光线从对应观众侧的出口出射。在增加出射光均匀性的基础上减少了光串扰。
实施例二
图3为本实用新型实施例二支撑板局部结构示意图。如图3所示，LED发光元件200可以设置在支撑板100的表面，也可以采用支撑板100挖凹槽800的方式，通过凹槽800设置在支撑板100的内部，但设置在内部时嵌入支撑板100中的深浅需要配合考虑出光效率进行设置。如图3所示，开设在支撑板100上的凹槽800为喇叭状，当然，本领域技术人员也可以根据实际需要对凹槽800的形状进行选择，比如：还可以为方形、矩形、圆台或扇形等等。以凹槽为喇叭状为例，喇叭状的凹槽表面形成有光反射材料，用于对入射的光线进行反射，下面说明设置嵌入式凹槽的效果；首先实施例一的侧发光LED发光元件发生的光束中，上侧面的部分大角度光线未经过反射部件的反射面反射后出射，而是直接出射，直接出射的光线并没有经过反射面的反射进行匀光，因此会影响出射光的均匀度；而实施例二的LED发光元件嵌入设计，可很好的解决大角度光线直接出射的问题，实施例二的LED发光元件出射的大角度光线被凹槽表面的反射材料反射后经过反射部件500的反射面出射，使得LED发光元件出射的所有光线都经过至少一次匀光出射，进一步可提升LED显示屏的光均匀性。
图4为本实用新型实施例二的LED显示屏幕的局部示意图。如图4并对照图2所示可知，在本实施例中，除了LED发光元件200在支撑板中的设置方式与实施例一有所不同之外，支撑板100和反射部件500两者的底部是相互不平齐的，反射部件与主板700直接相连，支撑板100的底部与主板700之间预留有接触焊点，支撑板通过接触焊点与引线300接通。
如图4所示，由LED发光元件200发出的光线L5、L6和L7，分别通过相邻的反射部件500和支撑板100的一次或多次反射后射出。其中光线L5经过了反射部件的两次反射、L6只经过了反射部件的一次反射，L7则分别经过了反射部件和支撑板的各一次反射。
实施例三
图5为本实用新型实施例三的LED显示屏幕的局部示意图。如图5所示，为相邻的两个像素单元，当LED发光元件200设置在其中一个像素单元的支撑板100的中部时，其发射出的光线La沿着相邻的像素单元的支撑板100的顶端直接出射，没有经过任何反射，会导致匀光效果不佳。而图5中的另外一个LED发光元件则设置在靠近支撑板100底部的位置，与光线La的出射角度完全相同的光线Lb，由于LED发光元件在支撑板100上的设置位置降低了，光线Lb在反射部件的反射面上发生反射之后，再出射。这样一来，通过增加光线的反射次数，进一步可提升LED显示屏的光均匀性。
实施例四
图6为本实用新型实施例四的LED显示屏幕的局部示意图。如图6所示，在本实施例中，反射部件500采用的是45°的反射面，LED发光元件200与45°的反射面一体化封装，反射面与LED元件一起焊接或分离安装。由于为45°的反射面，光线的反射方向会与弧面的匀光杯有所区别。但无论光线的反射方向如何，从LED发光元件200中发射出的光线，都是通过一次或多次的反射之后再出射给观众。如图6所示，光线L13和L14，分别从LED发光元件200中出射，经过反射面 和支撑板的两次和一次反射后射出。即对LED发光元件的光进行匀光，能够显著改善LED显示屏幕的颜色均匀性。
实施例五
图7为本实用新型实施例五的LED显示屏幕的局部示意图。如图7所示，本实施例是在上述实施例基础上的改进结构，具体来说，是在上述四个实施例及其变形结构的基础上，增加反射结构900。由前述的四个实施例中的光线反射路径中可知，LED发光元件的上侧面的部分大角度出射光线，未经过反射部件的反射或经过一次反射出射，这会导致匀光效果不佳。针对上述问题，本实施例在LED发光元件200的出光上侧设置反射结构900，反射结构900的高度以完全遮挡直接出射的光线为最佳。结合图7所示，反射结构900可以防止出射角度大于L15的光线直接出射，可以通过反射结构900的反射改变光线的传播和反射方向，如图7中的光线L16，在反射结构900的反射作用下，又分别通过相邻的反射部件、自身的支撑板、相邻的反射部件，经过四次反射后出射出去，光线经过多次的反射，增加了LED显示屏的光均匀性。
需要说明的是，反射结构900面对LED发光元件的一侧表面面设置有光反射材料，用于对入射的光线进行反射，反射结构背对LED发光元件的一侧表面，即反射结构面对出光面的一侧表面设置有光吸收材料，用于对入射的环境光进行吸收，以提高LED显示屏幕的对比度。
实施例六
图8为本实用新型实施例六的LED显示屏幕的局部示意图。如图8所示，在本实施例中，所述支撑板100与反射部件500一体化封装。为了增加LED像素的可视面积和角度均匀性，提高像素的连续性，所述反射部件的上方还设有扩散膜600。扩散膜600的表面或内部设置有光线散射颗粒或者其他微观结构，如磨砂处理后获得的粗糙表面，增加了LED像素的可视面积和角度均匀性，提高像素的连续性。需要说明的是，扩散膜不仅仅局限于在本实施例中使用，同样适用于上述的实施例一至实施例五，且设置位置都是位于反射部件的上方。
如图8所示，引线300与引脚400相连，引脚400通过焊盘410焊接固定在所述支撑板100的焊接层110上，焊接层110包括用于固定LED器件的焊盘。所述引脚400设置在所述反射部件的下方。此外，所述引脚400的竖直面上发光区域之外涂有黑色的吸收层420。由于封装的垂直面(即LED所在平面)及封装材料采用黑化处理，因此，对于环境光而言，进入显示的像素单元后，其反射光会被黑化表面吸收，即便是反射杯面采用较高反射率甚至镜面，也不会对观众产生影响而影响对比度。另外，引脚既起到配重作用、保持LED发光元件的垂直焊接和工艺工程中的稳定性，同时也埋藏于反射部件之下，不会反射环境光对对比度产生影响。
本实施例的加工过程是这样的：将LED发光元件200焊接在引线300上，并且从支撑板100的同一侧面引出并与引脚400相连，使所述引线300和引脚400之间呈90°夹角；将焊接后的LED发光元件200与反射部件，即：反射部件500组合安装，并将引脚400埋设于反射部件500的下方。为了保证产品的统一性，所述组合安装包括一体化封装。另外，所述垂直引脚和反射结构在侧发光LED的焊接过程中，用于保持重心平衡。
另外需要说明的是，反射部件500与支撑板100可以一体化封装。也就是说，LED发光元件200与匀光杯一体化封装，两者同时放在焊盘上经过回流焊，匀光杯提高了焊接时竖直放置的稳定性，其精度由PCB设计精度及回流焊工艺保证，方光配的配重方式令器件可以侧面站立在PCB上并经工艺考验。同时，反射部件也可以直接固定在支撑板100的焊接层110上的，并不与支撑板100一体化封装，两者的安装位置之间是有间隔的。也就是说，LED元件先焊接完成，后期再与匀光杯进行组合，均光杯具有较薄的上壁以提升填充率。
图9为本实用新型反射部件和支撑板的结构示意。如图9所示，在本实施例中，反射部件500为匀光杯，匀光杯在Z方向上的边缘形状为抛物线，所形成的立体形状在X和Y方向上均为直面，而在Z方向上为曲面，在曲面上设有反射面。从LED发光元件200中发出的光线L11和L12，分别通过相邻的反射部件和自身的支撑板的反射后出射。
图10为本实用新型反射部件结构示意图。如图10所示匀光杯是 在图6所示结构基础上的改进，两者的差别在于，图7所示的匀光杯在X方向和Z方向上的形状均为抛物线。采用上述结构，可以使光线的反射角度更加多样。
图11为本实用新型具有抛物面结构反射部件的LED显示屏像素照度分布示意图。由图11可知，当LED显示屏采用侧发光的LED的发光元件，且LFA显示屏的LED出射的光线经反射部件反射出射后的光照度分布均匀性有很大改善，像素填充率可接近100％，并且芯片发光的强度均匀性有很大改善，很好的解决了显示画面的颗粒感。
综上所述，本实用新型提供一种LED显示屏幕，通过侧面发光的LED发光元件和反射部件，使得侧面发光的LED所发出的全部光线都通过设置在反射部件上的反射面经过一次或多次反射后射向观众，从而使得光束的分布更加一致，显著改善LED显示屏幕的颜色均匀性。

Claims (11)

  1. 一种LED显示屏幕，包括：
    主板，所述主板包括多个阵列分布的像素单元；
    其特征在于，每个所述像素单元包括与所述主板连接的支撑板和反射部件；
    所述支撑板的一侧设有用于侧面发光的LED发光元件，所述反射部件与所述LED发光元件相对的一侧设有反射面；
    所述LED发光元件发出的光线通过相对的所述反射部件的所述反射面反射后射出。
  2. 如权利要求1所述的LED显示屏幕，其特征在于，所述反射部件的反射面为抛物面、曲面或45°斜面。
  3. 如权利要求1或2所述的LED显示屏幕，其特征在于，所述支撑板的一侧设有凹槽，所述LED发光元件设置在所述凹槽内。
  4. 如权利要求3所述的LED显示屏幕，其特征在于，所述凹槽的表面设有用于对LED发光元件的出射光进行反射的光反射材料。
  5. 如权利要求1或2所述的LED显示屏幕，其特征在于，所述支撑板还包括有用于对所述LED发光元件上方出射的大角度光线进行反射的反射结构，所述反射结构和所述LED发光元件设置在所述支撑板的同一侧，所述反射结构设置在所述LED发光元件的上方。
  6. 如权利要求5所述的LED显示屏幕，其特征在于，所述反射结构面对所述LED发光元件的一侧表面设有光反射材料，所述反射结构面对出光面的一侧表面设有光吸收材料。
  7. 如权利要求1或2所述的LED显示屏幕，其特征在于，所述LED发光元件设置于所述支撑板一侧靠近所述主板的一端。
  8. 如权利要求1所述的LED显示屏幕，其特征在于，所述支撑板的外表面除去所述LED发光元件位置之外的其它区域都设有反射材料。
  9. 如权利要求1所述的LED显示屏幕，其特征在于，所述主板面对出光面的表面设有反射材料。
  10. 如权利要求1所述的LED显示屏幕，其特征在于，还包括设置于所述LED显示屏幕出光面的扩散膜。
  11. 如权利要求1所述的LED显示屏幕，其特征在于，所述LED发光元件包括红色、绿色和蓝色LED发光芯片；
    或者，所述LED发光元件包括用于出射蓝光的LED发光芯片、用于出射绿光的蓝色LED芯片和波长转换材料及用于出射红光的蓝色LED芯片和波长转换材料。
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