WO2020063333A1 - Lentille optique d'écran d'affichage à del et écran d'affichage la contenant - Google Patents

Lentille optique d'écran d'affichage à del et écran d'affichage la contenant Download PDF

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Publication number
WO2020063333A1
WO2020063333A1 PCT/CN2019/105190 CN2019105190W WO2020063333A1 WO 2020063333 A1 WO2020063333 A1 WO 2020063333A1 CN 2019105190 W CN2019105190 W CN 2019105190W WO 2020063333 A1 WO2020063333 A1 WO 2020063333A1
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Prior art keywords
transmission grating
display screen
semi
grating
led display
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PCT/CN2019/105190
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English (en)
Chinese (zh)
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腾文东
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广州艾恩电子有限公司
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Publication of WO2020063333A1 publication Critical patent/WO2020063333A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/18—Diffraction gratings
    • G02B5/1814—Diffraction gratings structurally combined with one or more further optical elements, e.g. lenses, mirrors, prisms or other diffraction gratings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/18—Diffraction gratings
    • G02B5/1866—Transmission gratings characterised by their structure, e.g. step profile, contours of substrate or grooves, pitch variations, materials
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/18—Diffraction gratings
    • G02B2005/1804—Transmission gratings

Definitions

  • the invention belongs to the technical field of LED display screens, and more particularly, relates to an optical lens of an LED display screen and a display screen thereof.
  • the LED screen is composed of a dot matrix of multiple LED lights.
  • a dot matrix unit is a pixel unit, and its light emitting area is smaller than the pixel unit area.
  • the non-light emitting area appears black when the LED light is on, with a strong sense of grain and a viewing experience. Poor, dazzling, dizzy, and poor picture quality when viewed at close range.
  • the existing solution is to install a light guide in front of the LED display screen.
  • the LED screen front cover described in the invention patent (patent number CN105448199A) is provided with a plurality of lamp cover units forming an array. Above the LED lamp; the top of the lampshade unit is an arched structure facing away from the LED lamp, which changes the point light of the LED display screen to surface light.
  • This method can effectively eliminate moiré and reduce the overall display screen.
  • the area of the black area displayed in the grid format; but the LED display has a variety of pitches, and the size of the pixel unit of the LED light is different depending on the pitch.
  • the one-to-one correspondence between the lamp shade unit and the LED lamp requires different shade units.
  • LED display screens have developed more pitch specifications and different light emitting methods. The matching applicability of existing light guides needs to be urgently solved.
  • the surface of the LED display screen is covered with a lens array I and a lens array II, and a combination of the lens array I and the lens array II is used to enlarge the LED pixels.
  • a convex-convex lens combination and a convex-concave lens are used.
  • Any of the lens arrays I and lenticular arrays II and lenticular arrays, microlens arrays, and stripe microlens arrays can be used one-to-one for pixels, whether they are two-dimensional mesh structures or one-dimensional cross structures. Perform sizing, or many-to-one sizing.
  • the lens array I and the lens array II are used to enlarge the pixels of the LED display screen so that the LED pixels are combined with each other;
  • This application intends to provide a completely different optical lens for an LED display screen and its display screen, which uses a completely different technical principle from the published patent (application number: 201310566242.2) to set the lens so that it becomes a grating; for an optical lens, it is necessary to
  • the refractive index n that satisfies the first transmission grating and the second transmission grating is 1.2 ⁇ n ⁇ 2.0, and the relationship between the curvature radius r of the plurality of semi-cylindrical convex strips arranged on the side and the grating constant d is d / 2 ⁇ r ⁇ 15d; for the display, the number of grating slits corresponding to any one pixel unit of the LED light on the display must be greater than 2; the product of the diffraction factor and the interference factor of the first transmission grating and the second transmission grating After the beam is anisotropically sized and split, and passes through a rectangular diaphragm with a middle-pass
  • this application uses the product of the diffraction factor and interference factor of the transmission grating to image the characteristic principle of anisotropic and quantitative beam splitting in this way.
  • Point light into surface light can greatly enhance the optical pixel fill rate, the black area is greatly reduced, to eliminate graininess.
  • the present invention provides an optical lens for an LED display screen and a display screen thereof, which can convert the point light source array of the LED display screen into a surface light array, which has a low black zone rate, is fuller, and eliminates graininess.
  • An optical lens for an LED display screen is characterized in that it comprises a first transmission grating and a second transmission grating, and the bodies of the first transmission grating and the second transmission grating are both lenses with a refractive index between 1.2 and 2.0, A plurality of semi-cylindrical convex strips arranged in order on one side of the lens; a radius of curvature of the semi-cylindrical convex strip on the first transmission grating is r1, and a grating constant is d1, where d1 / 2 ⁇ r1 ⁇ 15d1 ; The radius of curvature of the semi-cylindrical convex strip on the second transmission grating is r2, and the grating constant is d2, where d2 / 2 ⁇ r2 ⁇ 15d2; the first transmission grating and the second transmission grating intersect each other in a long axis direction Cascade configuration.
  • An optical lens for an LED display screen in the above technical solution is provided with a first transmission grating and a second transmission grating arranged in a stacked configuration.
  • the light beam splits an incident beam into multiple beams in the transmission grating, and the beam is subjected to single-slit diffraction and Common modulation of phase delay; diffracted light intensity distribution is a pattern composed of multiple rectangles, which has a good effect on the elimination of black areas in the matrix form of LED display screens; formed by the diffraction and interference of the first and second transmission gratings
  • the beam splitting becomes an optical pixel composed of several optical pixel units, and the LED point light source is converted into a surface.
  • the cross-stacked first transmission grating and the second transmission grating can randomly correspond to any one of the LED pixel units on the LED display main body, which has strong adaptability and high light efficiency.
  • one side of the first transmission grating is provided with a semi-cylindrical convex strip and one side of the second transmission grating is provided with a semi-cylindrical convex strip, which are oppositely arranged; the other side of the first transmission grating is an LED The light-receiving surface of the lamp beam, and the other side of the second transmission grating is the light-emitting surface of the LED lamp beam.
  • one side of the first transmission grating is provided with a semi-cylindrical ridge
  • one side of the second transmission grating is provided with a semi-cylindrical ridge
  • the first transmission grating is provided with a semi-cylindrical ridge.
  • One side of the second transmission grating is a light-receiving surface, and one side of the second transmission grating is provided with a semi-cylindrical convex strip as an exit surface;
  • one side of the first transmission grating provided with semi-cylindrical convex strips and one side of the second transmission grating provided with semi-cylindrical convex strips are stacked in the same direction;
  • One side of the first transmission grating provided with a semi-cylindrical convex strip is a light receiving surface, and the other side of the second transmission grating is an exit surface; or, the other side of the first transmission grating is a light receiving surface, so A side surface of the second transmission grating provided with a semi-cylindrical convex strip is an exit surface.
  • the optical lens of the LED display screen is a split structure, which is composed of a split first transmission grating and a split second transmission grating; or the first transmission grating and the first transmission grating of the LED display optical lens.
  • the two transmission gratings are an integrated structure.
  • the long axis direction of the semi-cylindrical convex strip of the first transmission grating and the long axis direction of the semi-cylindrical convex strip of the second transmission grating are arranged at an angle of 90 °.
  • the first transmission grating and the second transmission grating are any one of a semi-curved cylindrical transmission grating and a semi-polygonal cylindrical transmission grating.
  • the present application also provides an LED display screen, which is characterized by comprising: a display screen main body provided with a pixel unit of an LED lamp and any one of the above-mentioned LED display screen optical lenses connected to the display screen main body and arranged on a light irradiation path. ; On the front projection surface of the display main body, any one of the LED light pixel units provided on the display main body has a corresponding number of slits of the first transmission grating greater than two, and the corresponding first The number of slits of the two transmission grating is greater than two.
  • the LED light pixel units on the display main body are arranged in an array.
  • the invention discloses an optical lens for an LED display screen and a display screen thereof, which are provided with a first transmission grating and a second transmission grating arranged in a stacked and crossed configuration.
  • a light intensity distribution domain of a set size is formed, and after passing through a rectangular diaphragm composed of a first transmission grating and a second transmission grating that are cross-stacked, the beam splitting becomes an optical pixel composed of a plurality of optical pixel units, and the LED dots
  • the light source is converted into surface light, which eliminates the graininess. When viewed at close range, it will not be dazzling, dizzy, and the image brightness will be more uniform, and the picture quality will be improved.
  • the cross-stacked first transmission grating and the second transmission grating correspond randomly to any one of the LED pixel units on the LED display main body, and have strong adaptability and high light efficiency.
  • FIG. 1 is a schematic diagram of an overall structure of an LED display screen according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram showing a structure of a display main body according to an embodiment of the present invention.
  • FIG. 3 is an enlarged structure diagram of an area A in FIG. 1;
  • FIG. 4 is a schematic diagram of the structure of a split-type back-to-back stack of an optical lens according to an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of an integrated optical lens according to another embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of a co-stacked optical lens according to another embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a relatively laminated optical lens according to another embodiment of the present invention.
  • FIG. 1 shows a schematic diagram of the overall structure of an LED display screen.
  • FIG. 2 is a schematic diagram showing a structure of a display main body.
  • the LED display screen includes a display screen main body 1 and an optical lens 2.
  • the optical lens 2 and the display screen main body 1 may be connected by means of bonding, snapping, or screws.
  • a PCB circuit board (not shown in the figure) is provided on the display main body 1, and LED lamp pixel units 11 are arranged on the PCB circuit board.
  • a plurality of LED lamp pixel units 11 are arranged in a matrix.
  • the display screen body 1 of the LED display screen may be arranged in other structures, and the LED lamp pixel units 11 may not be arranged in a matrix;
  • FIG. 3 is a schematic diagram illustrating an enlarged structure of an area A in FIG. 1.
  • FIG. 4 is an inter-structural diagram of a split-type optical lens in a separated configuration.
  • the optical lens 2 includes a first transmission grating 3 and a second transmission grating 4, and the bodies of the first transmission grating 3 and the second transmission grating 4 are both lenses with a refractive index between 1.2 and 2.0.
  • Anisotropic beam splitting is the optical properties of gratings.
  • the refractive index is 1.2 to 2.0; the number of grating slits corresponding to a pixel unit of any LED lamp is greater than 2; the grating constant and the radius of curvature also satisfy d / 2 ⁇ r In the case of ⁇ 15d, a light intensity distribution that can make the beam anisotropically sized beam split will be formed; the radius of curvature r is less than d / 2, and the slit is shielded from forming diffraction and interference; the radius of curvature r is greater than 15d,
  • the Fourier transform is a Sinc function.
  • the cylindrical surface is close to the plane, which is equivalent to a slit diffraction with a width of d.
  • Such a lens cannot form the light intensity distribution required in this embodiment, and cannot form light by diffraction and interference of a cross-stacked grating.
  • the technical effect of the patent (application number: 201310566242.2) in the background technology can only be achieved, and the technical effect required by this application cannot be achieved.
  • the long axis directions of the first transmission grating 3 and the second transmission grating 4 intersect and are stacked at 90 °; specifically, the long axis direction of the transmission grating refers to the long axis of the semi-cylindrical convex strip on the transmission grating. direction;
  • the long axis direction of the first transmission grating 3 is parallel to the vertical alignment direction of the matrix of the LED lamp pixel units 11, and the long axis direction of the second transmission grating 4 is parallel to the horizontal alignment direction of the matrix of the LED lamp pixel units 11.
  • this application is not limited to this.
  • the long axis direction of the first transmission grating 3 may be arranged at an arbitrary angle with the horizontal arrangement direction or the vertical arrangement direction of the matrix of the LED lamp pixel unit 11;
  • the crossing angle of the long axis direction of the first transmission grating 3 and the second transmission grating 4 may not be 90 °, and may also be arranged at any crossing angle between 45 °, 135 °, or 0 ° to 180 °; of course It is preferably 90 °, 45 °, and 135 °.
  • the long-axis direction of the second transmission grating 4 may be arranged at an arbitrary angle with the horizontal arrangement direction or the vertical arrangement direction of the matrix of the LED lamp pixel units 11; That is to say, the long axis directions of the first transmission grating 3 and the second transmission grating 4 can be arranged at any angle to form an optical lens 2; at the same time, the optical lens 2 can also be arbitrarily matched with the display main body 1, and the first transmission grating 3 and The second transmission grating 4 does not need to be specifically aligned with the LED lamp pixel unit 11 in some way, and can achieve the effect of converting a point light source into a surface light source.
  • the first transmission grating 3 and the second transmission grating 4 are both semi-curved cylindrical transmission gratings, and the semi-curved cylindrical transmission grating further includes semi-cylindrical protrusions as semi-cylindrical protrusions.
  • the semi-cylindrical transmission grating and the semi-ellipsoidal transmission grating whose semi-cylindrical convex stripes are semi-elliptical convex stripes.
  • this application is not limited to this.
  • the first transmission grating 3 and the second transmission grating 4 may also use a semi-polygonal prism-type transmission grating with semi-cylindrical protrusions as semi-polygonal prism-type protrusions.
  • the semi-cylindrical convex strips 311 or 411 in this embodiment are both convexly provided on one surface of the first transmission grating 3 and the second transmission grating 4; in other embodiments, a concave manner may also be adopted.
  • the “polygonal” in the polygonal convex strip may be “triangular” or other polygonal convex strips larger than “triangular”.
  • the bodies of the first transmission grating 3 and the second transmission grating 4 in this application are both lenses with a refractive index between 1.2 and 2.0.
  • the lens refers to a transparent substrate for production, and the refractive index is greater than 1.2 and less than 2.0 lens, transparent material can be made of resin, glass, etc., with a large amount of light, without losing the brightness and sharpness of the image.
  • the optical lens 2 is a split-type structure formed by combining the first transmission grating 3 and the second transmission grating 4 in a separated manner; the split-type optical lens 2,
  • the production process can be made simpler; the first transmission grating 3 and the second transmission grating 4 can be arbitrarily matched and combined to have different optical lenses 2; the applicability is wider.
  • this application is not limited to this.
  • an integrated structure as shown in FIG. 5 may be adopted, and the optical lens 2 is integrally produced.
  • the first transmission grating and the second transmission grating are produced during production. Instead of separate production, the complete body of the optical lens 2 is directly produced, and integrally produced.
  • the present application does not limit the first transmission grating 3 and the second transmission grating 4 to face away from the optical lens 2, and they are stacked and arranged side by side; the side of the first transmission grating 3 provided with semi-cylindrical convex stripes is A light-receiving surface, one side of the second transmission grating 4 provided with a semi-cylindrical convex strip is an exit surface;
  • one side of the first transmission grating 3 provided with semi-column convex strips and one side of the second transmission grating 4 provided with semi-column convex strips may be used in the same direction.
  • Ground stacked configuration specifically, it can be divided into the following two cases:
  • One side of the first transmission grating 3 without a semi-cylindrical convex strip may be provided close to the display main body 1, that is, the other side of the first transmission grating 3 is a light receiving surface, and the second transmission grating
  • the side of 4 provided with a semi-column convex strip is an exit surface.
  • One side of the first lens 3 on which the semi-cylindrical protrusions are provided is arranged close to the display main body 1, one side of the first transmission grating provided with the semi-cylindrical protrusions is a light receiving surface, and the second The other side of the transmission grating is the exit surface;
  • one side of the first transmission grating 3 provided with semi-column convex strips and one side of the second transmission grating 4 provided with semi-column convex strips may be used.
  • the description is made by using the arrangement in which the first lens 3 is closer to the display main body 1 than the second lens 4.
  • the side surface may replace the AG surface or AR anti-reflection surface.
  • the first transmission grating 3 and the second transmission grating 4 are stacked in a cross direction with a long axis of 90 °.
  • the light beam is emitted from the pixel unit 11 of the LED lamp, and passes through the first transmission grating 3 and the second transmission grating arranged in a phase-separated manner from back to front. 4.
  • the number of slits of the first transmission grating 3 and the second transmission grating 4 is e (e is an arbitrary number greater than 2), and one slit is formed between two adjacent semi-cylindrical convex strips; the first transmission grating 3 and The second transmission grating 4 is stacked and crossed to form e ⁇ e rectangular clear apertures, and the e ⁇ e rectangular apertures 21 randomly correspond to any one of the LED light pixel units 11 and any one of the LED light pixel units 11 After the emitted light beam passes through the e ⁇ e rectangular diaphragms 21, an optical pixel composed of e ⁇ e optical pixel units 5 is formed.
  • the light intensity distribution is a multi-beam interference modulated by a semi-cylindrical surface diffraction, and the maximum value distribution at each level conforms to the grating equation;
  • the diffraction spots of the gratings gradually increase.
  • the focal length of the Fourier transform lens is small, it is transformed into a focal line.
  • the positions of the diffraction orders are expressed as follows:
  • f is the grating focal length
  • d is the grating constant
  • ⁇ is the beam wavelength
  • Xo is the position of each diffraction order.
  • the grating constant is d
  • r is the radius of curvature
  • n is the refractive index
  • the PET material is used
  • a second transmission grating 4 is also provided.
  • the height (LH) ⁇ width (LW) of a given LED lamp pixel unit 11 is 2.5 mm ⁇ 2.5 mm, and the pitch is 2.5 mm.
  • a given LED lamp pixel unit 11 emits a point light source with a wavelength of 525 nm.
  • the height (GH) ⁇ width (GW) of the optical pixel (the optical pixel is a collection of several optical pixel units) is less than or equal to 2.5 mm ⁇ 2.5 mm.
  • the number of gratings irradiated by the light beam emitted from the point light source with a wavelength of 525 nm of the LED display pixel 11 is 18 lines, and the light beam is divided into The beam is a focal line with a length of approximately 2.5 mm, and the grating constant d is approximately 0.139 mm (that is, the number of focal lines / gratings is approximately 18 lines with a length of approximately 2.5 mm).
  • the light beam After anisotropically splitting the light beam through the first transmission grating 3, the light beam continues to travel forward.
  • the light beam is subjected to the product of the diffraction factor and the interference factor when passing through the second transmission grating 4.
  • the beam splitting in the 90-degree cross direction is a focal length of 2.5 mm * width 2.5 mm
  • the focal length is 18 ⁇ 18 rectangular diaphragms 21 composed of the first transmission grating 3 and the second transmission grating 4 stacked and crossed
  • the beam splitting becomes 18 ⁇ 18 optical pixel units 5.
  • the shape of the optical pixel units 5 is rectangular.
  • the 18 ⁇ 18 optical pixel units 5 form an optical pixel.
  • the optical pixels are rectangular with a length of 2.5 mm * width of 2.5 mm.
  • any 18 ⁇ 18 rectangular diaphragms 21 randomly correspond to any one of the LED display pixels 11, and the point light source array of the LED display pixels 11 is converted into a surface light array of an optical pixel set. .
  • the grating constant is d
  • r is the radius of curvature
  • n is the refractive index
  • ⁇ r ⁇ 15d is also provided.
  • the height (LH) ⁇ width (LW) of a given LED lamp pixel unit 11 is 1.25 mm ⁇ 1.25 mm, and the pitch is 1.25 mm.
  • a given LED lamp pixel unit 11 emits a point light source with a wavelength of 525 nm.
  • the height (GH) ⁇ width (GW) of the optical pixel (the optical pixel is a collection of several optical pixel units) is less than or equal to 1.25 mm ⁇ 1.25 mm.
  • the wavelength of the LED lamp pixel unit 11 is 525 nm.
  • the number of gratings illuminated by the light beam emitted by the light source is 9 lines, the beam is split into a focal line with a length of approximately 1.25 mm, and the grating constant d is approximately 0.138 mm (that is, the number of focal lines / rasters with a length of approximately 1.25 mm is 9 lines).
  • the light intensity fluctuation gradually increases to the last valley and peak fluctuation of the “flat-top” edge.
  • the first focal region with a length of approximately 1.25 mm, and the long axis direction of the first focal region is 90 degrees perpendicular to the long axis direction of the first transmission grating 311; when the first transmission grating 3 and the pixel unit 11 of the LED lamp 11
  • the distance f is less than 1.4mm, the shorter the distance, the closer the light intensity distribution is to a "Gaussian" distribution, that is, the middle is the largest, and the two sides gradually decrease.
  • the distance f between the first transmission grating 3 and the pixel unit 11 of the LED lamp is greater than 1.6 mm, adjacent light intensity distributions begin to cross and affect each other.
  • the light beam continues to travel forward.
  • the light beam is subjected to the product of the diffraction factor and the interference factor when passing through the second transmission grating 4.
  • the beam splits into a length of 1.25 mm * width 1.25 when the long axis of the second transmission grating 4 is at a 90-degree crossing direction.
  • the beam splitting becomes 9 ⁇ 9 optical pixel units 5
  • the shape of the optical pixel unit 5 is rectangular.
  • the 9 ⁇ 9 optical pixel units 5 form an optical pixel.
  • the optical pixel is a rectangle with a length of 1.25 mm * width of 1.25 mm.
  • any 9 ⁇ 9 rectangular diaphragms 21 randomly correspond to any one of the LED display pixels 11, and the point light source array of the LED display pixels 11 is converted into a surface light array of an optical pixel set. .

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)

Abstract

L'invention concerne une lentille optique d'écran d'affichage à DEL et un écran d'affichage l'utilisant. La lentille optique d'écran d'affichage à DEL est pourvue d'un premier réseau de transmission (3) et d'un second réseau de transmission (4) agencés dans un mode empilé et croisé. Un faisceau lumineux émis par une lampe à DEL forme une région de distribution d'intensité lumineuse d'une taille définie dans des actions de diffraction et d'interférence du premier réseau de transmission (3) et du second réseau de transmission (4) et, après avoir traversé un diaphragme rectangulaire formé par le premier réseau de transmission (3) et le second réseau de transmission (4) agencés dans un mode empilé et croisé, le faisceau lumineux étant divisé en pixels optiques composés d'une pluralité d'unités de pixels optiques (11), une source de lumière ponctuelle à DEL est convertie en lumière plane, une granulation est éliminée, un vertige pendant une visualisation de près est évité, la luminosité d'image est plus uniforme et la qualité d'image est améliorée. Le premier réseau de transmission (3) et le second réseau de transmission (4) agencés dans un mode empilé et croisé correspondent à l'une quelconque des unités de pixels de lampe à DEL (11) sur un corps d'écran d'affichage à DEL de manière aléatoire, la compatibilité est élevée et l'efficacité lumineuse est élevée.
PCT/CN2019/105190 2018-09-26 2019-09-10 Lentille optique d'écran d'affichage à del et écran d'affichage la contenant WO2020063333A1 (fr)

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CN201811129166.8 2018-09-26
CN201811129166.8A CN108897084A (zh) 2018-09-26 2018-09-26 一种led显示屏光学透镜及其显示屏

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CN108897084A (zh) * 2018-09-26 2018-11-27 广州艾恩电子有限公司 一种led显示屏光学透镜及其显示屏
CN110161711A (zh) * 2019-05-27 2019-08-23 珠海迈时光电科技有限公司 一种激光分束器及光学设备

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