WO2020063703A1 - Écran d'affichage à led - Google Patents

Écran d'affichage à led Download PDF

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Publication number
WO2020063703A1
WO2020063703A1 PCT/CN2019/107995 CN2019107995W WO2020063703A1 WO 2020063703 A1 WO2020063703 A1 WO 2020063703A1 CN 2019107995 W CN2019107995 W CN 2019107995W WO 2020063703 A1 WO2020063703 A1 WO 2020063703A1
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WO
WIPO (PCT)
Prior art keywords
emitting chip
light
light emitting
led lamp
display screen
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PCT/CN2019/107995
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English (en)
Chinese (zh)
Inventor
胡飞
李士杰
李屹
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深圳光峰科技股份有限公司
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Publication of WO2020063703A1 publication Critical patent/WO2020063703A1/fr

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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
    • G09F9/302—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 characterised by the form or geometrical disposition of the individual elements
    • 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 invention relates to an LED display screen, and belongs to the technical field of LED display screen manufacturing.
  • LED lamp beads have the characteristics of high luminous brightness.
  • the large screen composed of LED lamp bead matrix has high brightness (higher than 1000Nit) and high display uniformity, so it has a better viewing effect than projection.
  • LED array display has other advantages, such as fast response speed of each LED lamp bead, which can be individually controlled on and off. It can be completely turned off when displaying a black field, so it has a high contrast ratio.
  • the LED lamp bead has a narrow spectrum and high brightness. It still maintains a wide color gamut.
  • FIG. 1 is a schematic structural view of a conventional LED lamp bead
  • FIG. 2 is a perspective view showing a structure of a conventional LED lamp bead.
  • traditional LED lamp beads generally include three-color light-emitting chips arranged in a straight line: a first light-emitting chip 11 (such as a red light-emitting chip), a second light-emitting chip 12 (such as a green light-emitting chip), and a third The light-emitting chip 13 (blue light-emitting chip), because the three-color light-emitting chips are arranged in a straight line, and the distance from the light-shielding frame is different.
  • a first light-emitting chip 11 such as a red light-emitting chip
  • a second light-emitting chip 12 such as a green light-emitting chip
  • the light-emitting chip 13 blue light-emitting chip
  • the first light-emitting chip 11 and the second light-emitting chip emit light.
  • the distance between the chip 12 and the third light-emitting chip 13 from the light-shielding frame is different, so the light-shielding frame does not block the first light-emitting chip 11, the second light-emitting chip 12, and the third light-emitting chip 13 differently, and directly from the light-emitting chip without going through the light-shielding frame.
  • the emitted light has a greater light intensity, so when viewing a screen composed of traditional LED lamp beads, a color difference at a certain viewing angle will appear, and the color is biased to the light-emitting chip's light-emitting color.
  • FIG. 3 is a light intensity distribution diagram of a conventional LED lamp bead in the state of FIG. 2.
  • FIG. 3 shows light intensity distributions of the first light emitting chip 11, the second light emitting chip 12, and the third light emitting chip 13 from left to right. It can be seen that the light distribution of the three light-emitting chips is different, and the vertical angle distribution of red and blue light is inconsistent.
  • u 'and v' as the color coordinates in the CIE-LUV color coordinate system
  • u ' ref and v' ref Is the color coordinate at 0 ° viewing angle
  • the technical problem to be solved by the present invention is to address the shortcomings of the prior art, and provide an LED display screen.
  • the pixel filling rate of the LED display screen is improved by using a diffusion film, and a matrix shading frame is used to avoid mutual crosstalk between pixels.
  • the centrally distributed LED lamp beads effectively solve the problem of color difference generated when viewing LED display screens at different angles.
  • the present invention provides an LED display screen.
  • the LED display screen includes an LED lamp bead array and a matrix shading frame.
  • the matrix shading frame is disposed on a light emitting side of the LED lamp bead array, and the LED lamp bead array includes a plurality of LED lights.
  • the LED lamp beads include a first light emitting chip, a second light emitting chip, and a third light emitting chip, and the first light emitting chip, the second light emitting chip, and the third light emitting chip are symmetrically distributed with respect to the center of the LED light bead, respectively.
  • the first light emitting chip is one of a red light emitting chip, a green light emitting chip, and a blue light emitting chip
  • the second light emitting chip is another one of the red light emitting chip, the green light emitting chip, and the blue light emitting chip.
  • the third light emitting chip is the last one of a red light emitting chip, a green light emitting chip, and a blue light emitting chip.
  • the number of the first light-emitting chip, the second light-emitting chip, and the third light-emitting chip are two, and the first light-emitting chip, the second light-emitting chip, and the third light-emitting chip are matrixed in a manner of three rows and two columns.
  • the first row is the first light emitting chip and the third light emitting chip
  • the second row is the second light emitting chip
  • the third row is the third light emitting chip and the first light emitting chip.
  • the first light-emitting chip, the second light-emitting chip, and the third light-emitting chip are arranged in an “X” shape.
  • the number of the first light emitting chip and the third light emitting chip are two, the number of the second light emitting chip is one, the second light emitting chip is located at the center, the first light emitting chip and the second light emitting chip, and the third light emitting chip.
  • Located on a straight line, another first light-emitting chip, another third light-emitting chip, and a second light-emitting chip are located on another straight line. The two straight lines cross each other in an “X” shape.
  • a plurality of the LED lamp beads are arranged on the substrate in a rectangular array.
  • the substrate is coated with a black light absorbing layer on the side where the LED lamp beads are disposed.
  • the matrix shading frame is provided with a plurality of hollow grids, the number of the hollow grids is the same as the number of the LED lamp beads, and each of the LED lamp beads is arranged corresponding to the center of the hollow grid.
  • the thickness of the side wall of the hollow grid is gradually reduced in a direction away from the LED lamp bead array.
  • the LED display screen further includes a diffusion film, which is disposed on a side of the matrix light-shielding frame away from the LED lamp bead array.
  • the diffusion film is a surface diffusion film, a bulk diffusion film, or a double-layer laminated diffusion film
  • the double-layer laminated diffusion film is composed of a hard plate and a diffusion layer.
  • the first light emitting chip, the second light emitting chip and the third light emitting chip are separately packaged to form an LED lamp bead.
  • the first light emitting chip, the second light emitting chip and the third light emitting chip are integrally packaged to form an LED lamp bead.
  • the invention uses a diffusing film to improve the pixel filling rate of an LED display screen, uses a matrix shading frame to avoid mutual crosstalk between pixels, and effectively solves the problems caused by viewing LED display screens at different angles by setting LED lamp beads that are symmetrically distributed in the center. Chromatic aberration.
  • FIG. 1 is a schematic structural diagram of a conventional LED lamp bead
  • FIG. 2 is a perspective view of a structure of a conventional LED lamp bead
  • FIG. 3 is a light intensity distribution diagram of a conventional LED lamp bead in the state of FIG. 2;
  • FIG. 5 is a cross-sectional view of a single pixel of the LED display screen of the present invention.
  • FIG. 6 is a sectional view of an LED lamp bead integrally packaged with a light emitting chip according to the present invention
  • FIG. 7 is a sectional view of an LED lamp bead individually packaged by a light emitting chip of the present invention.
  • FIG. 10 is a front view of a single pixel of an LED display screen according to a first embodiment of the present invention.
  • FIG. 11 is a lateral oblique view of a single pixel of an LED display screen according to a first embodiment of the present invention
  • FIG. 12 is a longitudinal oblique view of a single pixel of an LED display screen according to a first embodiment of the present invention
  • FIG. 13 is a luminous intensity distribution diagram of the LED lamp beads in the state of FIG. 12;
  • FIG. 14 is a front view of a single pixel of an LED display screen according to a first embodiment of the present invention.
  • 15 is a lateral oblique view of a single pixel of an LED display screen according to a first embodiment of the present invention.
  • 16 is a longitudinal perspective view of a single pixel of an LED display screen according to a first embodiment of the present invention.
  • FIG. 17 is a light intensity distribution diagram of the LED lamp beads in the state of FIG. 16.
  • FIG. 4 is a structural exploded view of the LED display screen of the present invention
  • FIG. 5 is a cross-sectional view of a single pixel of the LED display screen of the present invention.
  • the present invention provides an LED display screen.
  • the LED display screen includes an LED lamp bead array 100, a matrix shading frame 102, and a diffusion film 101.
  • the diffusion film 101 is disposed on the LED lamp bead array.
  • the matrix light-shielding frame 102 is disposed between the LED lamp bead array 100 and the diffusion film 101, that is, the matrix light-shielding frame 102 is disposed at the light-emitting side of the LED lamp bead array 100.
  • the LED lamp bead array includes a substrate, a driving circuit, a driving chip and a plurality of LED lamp beads 10 disposed on the substrate.
  • the substrate may be a PCB (Printed Circuit Board) circuit board, and the LED lamp beads 10 include a first light-emitting chip 11, a second light-emitting chip 12, and a third light-emitting chip 13, preferably a first light-emitting chip. 11. LED chips in which the second light emitting chip 12 and the third light emitting chip 13 are packaged together.
  • Each LED lamp bead represents a pixel.
  • a plurality of the LED lamp beads are preferably arranged in a rectangular array on the PCB circuit board.
  • the substrate is coated with a black light absorbing layer on the side where the LED lamp beads 10 are disposed.
  • the LED lamp beads can be fixed on the substrate by means of reflow soldering, and the driving circuit and the driving chip are used to control the brightness of the first light emitting chip 11, the second light emitting chip 12, and the third light emitting chip 13 in the LED light beads 10. .
  • the colors of the first light-emitting chip 11, the second light-emitting chip 12, and the third light-emitting chip 13 are different.
  • the first light-emitting chip 11 is one of a red light-emitting chip, a green light-emitting chip, and a blue light-emitting chip.
  • the second light emitting chip 12 is another one of the red light emitting chip, the green light emitting chip, and the blue light emitting chip
  • the third light emitting chip 13 is the last one of the red light emitting chip, the green light emitting chip, and the blue light emitting chip.
  • the colors of the first light-emitting chip 11, the second light-emitting chip 12, and the third light-emitting chip 13 are different from each other and can be interchanged.
  • the first light-emitting chip 11, the second light-emitting chip 12, and the third light-emitting chip 13 in the LED lamp beads 10 may not be packaged together, but light-emitting chips of each color may be separately packaged.
  • the individually packaged light-emitting chips constitute an LED lamp bead.
  • 6 is a cross-sectional view of an LED lamp bead packaged with a light-emitting chip as a whole
  • FIG. 7 is a cross-sectional view of an LED lamp bead packaged with a light-emitting chip alone. As shown in FIG. 6, the first light-emitting chip 11, the second light-emitting chip 12, and the third light-emitting chip 13 are packaged together to form an LED lamp bead.
  • the first light-emitting chip 11 the first A reflective layer 123 is provided around the two light emitting chips 12 and the third light emitting chip 13. As shown in FIG. 7, the light emitting chip is separately packaged.
  • This structure is generally used when the distribution area of the LED light emitting chip is large. For example, when the distribution area is larger than 3 * 3 mm 2 , this structure can be used.
  • the LED display screen further includes a diffusion film 101, which is arranged on the matrix shading frame 102 The side far from the LED lamp bead array 100, that is, the light exit side of the matrix light-shielding frame 102.
  • the diffusion film 101 may be a surface diffusion film or a body diffusion film, and may also be a two-layer laminated diffusion film composed of a rigid plate such as an acrylic plate or a glass plate and a diffusion layer, wherein the diffusion layer is disposed on the outside, that is, away from the LED lamp.
  • the light emitted by the LED lamp bead array 100 is irradiated on the diffusion film 101, and each pixel formed on the diffusion film 101 corresponds to the LED lamp beads 10 in the LED lamp bead array 100 one by one.
  • FIG. 8 is a sectional view of light distribution of the LED lamp beads of the present invention
  • FIG. 9 is a sectional view of light distribution of the LED lamp beads of the present invention.
  • the pixel fill ratio is defined as the ratio of the light emitting area of the LED lamp beads to the pixel area, when the surface of the LED lamp beads is covered with a diffusion film, the distance between the LED lamp beads and the diffusion film is h.
  • the method for determining the light emitting area is: take the spot corresponding to a single pixel, and the central illuminance value is L, then the area of the light spot with an illuminance value not less than aL is the light spot area of the pixel (that is, the light emitting area), where 0 ⁇ a ⁇ 0.5, and the distance p between adjacent LED lamp beads, since the illuminated area on the surface of the diffusion film can be defined by the spot radius r (or spot diameter D), the pixel fill ratio can be defined as the ratio of the spot area to the pixel area:
  • the light emitted from the LED lamp beads 10 irradiates the diffusion film 101 to form a light spot larger than the area of the LED lamp beads, so that the pixel lattice on the diffusion film 101 has a higher pixel filling rate than the pixel lattice of the LED lamp beads.
  • a viewer looks at a screen composed of an LED lamp bead array and sees a plurality of LED lamp beads 10. After the diffuser film 101 is provided, the viewer views For the screen of the diffusion film, the entire diffusion film 101 is seen, and the pixel filling rate of the screen is significantly increased.
  • the diffusion film 101 is adhered to the matrix light-shielding frame 102 by a transparent ultraviolet glue, and the diffusion angle of the diffusion film 101 is 30 ° in the transverse direction and 15 ° in the longitudinal direction.
  • the matrix shading frame 102 is used to block crosstalk light from adjacent LED lamp beads 10.
  • the matrix shading frame 102 is provided with a plurality of hollow grids 103.
  • the number of the hollow grids 103 is the same as the number of the LED lamp beads 10.
  • Each of the LED lamp beads 10 and the center of the hollow grid 103 Correspondingly set, that is, in a direction perpendicular to the substrate, the center of the LED lamp beads 10 coincides with the center of the hollow grid 103, and the center of the LED lamp beads 10 is also the center of the pixel. Factors, the coincidence recorded here allows a certain error, and when there is a certain error, the problem of color difference can still be solved.
  • the matrix light-shielding frame 102 may be made of metal or plastic, and an inner layer is coated with an absorption layer, a reflection layer, or a scattering layer for preventing crosstalk.
  • a side wall of the matrix light-shielding frame may be coated with a Gaussian scattering angle.
  • a 15 ° high reflectivity paint is used as the reflective layer 1022, so that the light emitted by each LED lamp bead 10 is restricted to propagate within the hollow grid 103.
  • the hollow grid 103 of the matrix shading frame 102 may be circular or rectangular, preferably square.
  • the thickness of the side wall of the hollow grid 103 is gradually reduced in the direction away from the LED lamp bead array 100, that is, the width w of the side of the side of the hollow grid 103 near the LED lamp bead array 100 is greater than the distance away from the LED lamp bead array 100 side width g.
  • the cross section of the side wall of the hollow grid 103 is trapezoidal.
  • the matrix shading frame 102 can be fixedly connected to the LED lamp bead array 100 by means of a buckle or the like.
  • the first light emitting chip, the second light emitting chip, and the third light emitting chip in the LED lamp beads 10 are arranged in a certain form for eliminating the light emitting chip.
  • the chromatic aberration of the emitted light at a certain viewing angle Specifically, the first light-emitting chip 11, the second light-emitting chip 12, and the third light-emitting chip 13 are symmetrically distributed with respect to the center of the LED lamp bead, respectively.
  • the center-symmetric figure refers to rotating a figure 180 ° around a point in the plane, if the rotated figure can coincide with the original figure, this figure is called a center-symmetric figure, and this point is called its center of symmetry.
  • the first light-emitting chip 11, the second light-emitting chip 12, and the third light-emitting chip 13 are respectively symmetrically distributed with respect to the center of the LED lamp bead.
  • the first light-emitting chip 11 The second light-emitting chip 12 and the third light-emitting chip 13 are arranged in a center-symmetrical pattern, and the colors of the first light-emitting chip 11, the second light-emitting chip 12, and the third light-emitting chip 13 cannot all be the same.
  • the color positions of a plurality of light-emitting chips arranged in a line are changed after rotation and cannot overlap, and they are not center-symmetrical figures.
  • the above structure can make the viewer have a color difference du 'within a range of ⁇ 70 ° in the horizontal direction and ⁇ 50 ° in the vertical direction.
  • v ' is consistently less than 0.008, that is, the color difference phenomenon cannot be noticed.
  • FIG. 10 is a front view of a single pixel of an LED display screen according to a first embodiment of the present invention
  • FIG. 11 is a lateral oblique view of a single pixel of an LED display screen according to an embodiment of the present invention
  • Oblique view As shown in FIG. 5 to FIG. 12, in this embodiment, the number of the first light-emitting chip 11, the second light-emitting chip 12, and the third light-emitting chip 13 included in the LED lamp beads are two. The distance p between the LED lamp beads is 2.5 mm.
  • the LED lamp beads are packaged using SMT (Surface Mount Technology). The size of the LED lamp beads after packaging is 1.5mm ⁇ 1.5mm, and the side length d of the light emitting chip is 0.001mm to 1mm, preferably 0.1mm to 0.3mm.
  • the first light-emitting chip 11, the second light-emitting chip 12, and the third light-emitting chip 13 are arranged in a matrix of three rows and two columns, and the first row from left to right is the first light-emitting chip 11 and the third
  • the light-emitting chips 13 are in the second row each of the second light-emitting chip 12, and the third row is the third light-emitting chip 13 and the first light-emitting chip 11 from left to right.
  • each of the first light-emitting chip 11, the second light-emitting chip 12, and the third light-emitting chip 13 is blocked by the matrix light-shielding frame 102 without affecting the color.
  • Balance as shown in FIG. 12, when the LED lamp beads are viewed in the longitudinal direction (V direction), each of the first light-emitting chip 11 and the third light-emitting chip 13 is blocked by the matrix shading frame 102, which also does not affect the color balance.
  • FIG. 13 is a light intensity distribution diagram of the LED lamp beads in the state of FIG. 12.
  • FIG. 13 shows the light emission intensity distributions of the first light-emitting chip 11, the second light-emitting chip 12, and the third light-emitting chip 13 from left to right.
  • the red, green and blue light-emitting chips The angular distributions of the luminous intensity are symmetrical.
  • the material of the matrix light-shielding frame 102 is polycarbonate (PC), and the inner surface of the side wall is coated with a diffuse reflection layer with a Gaussian scattering angle of 20 °, and the reflectance is 85%.
  • PC polycarbonate
  • the width w of the side of the side wall of the hollow grid 103 near the LED lamp bead array 100 is 2.2 mm
  • the width of the side of the side wall away from the LED lamp bead array 100 is 1.3 mm
  • the height of the matrix shading frame 102 h is 3 mm.
  • the shading frame is fixed in the welding seam of the substrate and the LED lamp beads by buckles.
  • FIG. 14 is a front view of a single pixel of the LED display screen according to the first embodiment of the present invention
  • FIG. 15 is a horizontal oblique view of a single pixel of the LED display screen according to the first embodiment of the present invention
  • Angle view is a light intensity distribution diagram of the LED lamp beads in the state of FIG. 16.
  • the number of the first light emitting chip 11 and the third light emitting chip 13 included in the LED lamp beads are two, and the number of the second light emitting chip 12 is one.
  • the distance p between the LED lamp beads is 5 mm.
  • the LED lamp beads are packaged using SMT (Surface Mount Technology). After the package, the size of the LED lamp beads is 2.5mm ⁇ 2.5mm, and the side length d of the light-emitting chip is 0.001mm to 1mm, preferably 0.1mm to 0.3mm.
  • the first light-emitting chip 11, the second light-emitting chip 12, and the third light-emitting chip 13 are arranged in an "X" shape, wherein the second light-emitting chip 12 is located at the center, and one first light-emitting chip 11 and the second light-emitting chip
  • the chip 12 and a third light-emitting chip 13 are located on a straight line, and the other first light-emitting chip 11 and another third light-emitting chip 13 and the second light-emitting chip 12 are located on another straight line.
  • the two lines cross each other to form an “X”. Font.
  • each of the first light-emitting chip 11 and the third light-emitting chip 13 is blocked by the matrix shading frame 102, which does not affect the color balance, as shown in FIG. 16.
  • the matrix shading frame 102 As shown, when the LED lamp beads are viewed in the longitudinal direction (V direction), each of the first light-emitting chip 11 and the third light-emitting chip 13 is blocked by the matrix light-shielding frame 102, which also does not affect the color balance.
  • FIG. 17 is a light intensity distribution diagram of the LED lamp beads in the state of FIG. 16.
  • FIG. 17 shows the light emission intensity distribution of the first light-emitting chip 11, the second light-emitting chip 12, and the third light-emitting chip 13 from left to right.
  • the red, green and blue light-emitting chips The angular distributions of the luminous intensity are symmetrical.
  • the material of the matrix light-shielding frame 102 is polycarbonate (PC), and the inner surface of the sidewall is coated with a diffuse reflection layer having a Gaussian scattering angle of 15 °, and the reflectance is 50% to 95%, preferably 95%.
  • PC polycarbonate
  • the width w of the side of the side wall of the hollow grid 103 near the LED lamp bead array 100 is 1.2 mm
  • the width g of the side of the side wall away from the LED lamp bead array 100 is 0.5 mm.
  • the height of the matrix shading frame 102 h is 5mm.
  • the shading frame is fixed in the welding seam of the substrate and the LED lamp beads by buckles.
  • the embodiments described above are only a part of the embodiments of the present invention, but not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
  • the light-emitting chip with the matrix structure of three rows and two columns in the first embodiment is defined as the first structure
  • the light-emitting chip of the "X" shape in the second embodiment is defined as the second structure, which is composed of a plurality of the first structure and / or the second structure.
  • the centrally symmetric pattern can also be used as an embodiment of the present invention.
  • the present invention uses a diffuser film to improve the pixel fill rate of an LED display screen, and uses a matrix shading frame to avoid mutual crosstalk between pixels.
  • a diffuser film to improve the pixel fill rate of an LED display screen
  • a matrix shading frame to avoid mutual crosstalk between pixels.

Abstract

La présente invention concerne un dispositif d'affichage à LED. L'écran d'affichage à LED comprend un réseau de perles de lampe à LED (100) et un cadre d'ombrage matriciel (102), le cadre d'ombrage matriciel (102) est disposé sur un côté d'émergence de lumière du réseau de perles de lampe à LED (100); le réseau de perles de lampe à LED (100) comprend une pluralité de perles de lampe à LED (10); les perles de lampe à LED (10) comprennent une première puce électroluminescente (11), une deuxième puce électroluminescente (12) et une troisième puce électroluminescente (13); et la première puce électroluminescente (11), la deuxième puce électroluminescente (12) et la troisième puce électroluminescente (13) sont distribuées symétriquement par rapport au centre des perles de lampe à LED (10), respectivement. Un taux de remplissage de pixel d'un écran d'affichage à LED est amélioré en utilisant un film de diffusion (101), et la diaphonie mutuelle entre les pixels est évitée en utilisant le cadre d'ombrage matriciel (102). En faisant en sorte que les perles de lampe à LED (10) soient distribuées symétriquement au centre, le problème d'une différence de couleur générée lorsque l'écran d'affichage à LED est visualisé à des angles différents est efficacement résolu.
PCT/CN2019/107995 2018-09-28 2019-09-26 Écran d'affichage à led WO2020063703A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201811137812.5 2018-09-28
CN201811137812.5A CN110969956A (zh) 2018-09-28 2018-09-28 Led显示屏

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WO2020063703A1 true WO2020063703A1 (fr) 2020-04-02

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