WO2020063333A1

WO2020063333A1 - Led display screen optical lens and display screen containing same

Info

Publication number: WO2020063333A1
Application number: PCT/CN2019/105190
Authority: WO
Inventors: 腾文东
Original assignee: 广州艾恩电子有限公司
Priority date: 2018-09-26
Filing date: 2019-09-10
Publication date: 2020-04-02
Also published as: CN108897084A

Abstract

An LED display screen optical lens and a display screen using same. The LED display screen optical lens is provided with a first transmission grating (3) and a second transmission grating (4) arranged in a stacked and crossed mode. A light beam emitted from an LED lamp forms a light intensity distribution region of a set size under diffraction and interference actions of the first transmission grating (3) and the second transmission grating (4), and after passing through a rectangular diaphragm formed by the first transmission grating (3) and the second transmission grating (4) arranged in a stacked and crossed mode, the light beam is split into optical pixels composed of a plurality of optical pixel units (11), an LED point light source is converted to plane light, graininess is eliminated, dizziness during a close look is avoided, the image brightness is more uniform, and the picture quality is improved. The first transmission grating (3) and the second transmission grating (4) arranged in a stacked and crossed mode correspond to any of the LED lamp pixel units (11) on an LED display screen body randomly, the compatibility is high, and the luminous efficacy is high.

Description

Optical lens for LED display screen and display screen

Technical field

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.

Background technique

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. With the development of SMD and COB and other patch technologies, 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.

In another published patent (patent number: CN106023824A), it is a whole that is bonded with multiple layers of transparent or partially transparent plastic paper in front of the LED screen to form a dot matrix distribution circular hole. There is no black mesh in the circular hole to maintain the screen cover. The transparency of the body, the screen body of the invention reduces the light intensity of the pixel unit, and the light transmission in the part of the light-transmitting area suppresses the cross-talk between the pixels, but this way of blocking part of the light reduces the amount of light and cannot be efficient In order to use the luminous efficiency of LED lights, the sharpness of the image is lost.

In another published patent (application number: 201310566242.2), 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. According to the description and optical principle of the patent (application number: 201310566242.2), it can be known that the optical properties of the microlens array and the striped microlens array are equivalent to the superposition of the optical properties of a single microlens. Therefore, any of lens array I and lens array II One kind of combination only needs to determine the object distance according to the object-image relationship to get an enlarged image.

In the above-mentioned published patent (application number: 201310566242.2), 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 through the first and second transmission gratings, the diffracted light intensity of the beam is distributed into a pattern consisting of multiple rectangles. From spot light to surface light; 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.

Summary of the Invention

In order to overcome the shortcomings of the prior art, 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.

The technical solutions adopted by the present invention to solve its technical problems are:

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 After setting the size of the light intensity distribution domain and passing through the rectangular aperture composed of the first transmission grating and the second transmission grating, the beam splitting becomes an optical pixel composed of several optical pixel units, and the LED point light source is converted into a surface. Light eliminates graininess, does not glare, dizziness, and more uniform image brightness when viewed at close range; the picture quality is improved; the above technical solution uses the product of the diffraction factor and the interference factor of the transmission grating to quantitatively divide the beam anisotropy. Beam imaging based on the principle of beam characteristics. In this way, converting point light to surface light can greatly increase the fullness of optical pixels. The black area is greatly reduced, and the graininess is eliminated. 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.

Preferably, 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.

Preferably, one side of the first transmission grating is provided with a semi-cylindrical ridge, and 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;

Preferably, 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.

Preferably, 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.

Preferably, 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 °.

Preferably, 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 beneficial effects of the present invention are:

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. The diffraction and After interference, 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.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is further described below with reference to the drawings and embodiments.

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.

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.

FIG. 7 is a schematic structural diagram of a relatively laminated optical lens according to another embodiment of the present invention.

detailed description

The present invention will now be described in further detail with reference to the drawings. These drawings are simplified schematic diagrams, which illustrate the basic structure of the present invention only in a schematic manner, and therefore they only show the constitutions related to the present invention.

Hereinafter, referring to FIG. 1 to FIG. 7, the optical lens and the LED display screen having the lens of the present invention will be described in detail through various embodiments.

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.

Please refer to FIG. 1, wherein 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.

Please refer to FIG. 2, 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. This application is not limited to this. In other embodiments, 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.

See Figure 1, Figure 2, Figure 3 and Figure 4;

In this embodiment, 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. A plurality of semi-cylindrical convex strips (311 or 411) arranged in sequence on one side of the lens; the semi-cylindrical convex strip (labeled 311 in the drawing) on the first transmission grating 3, and its radius of curvature Is r1, the grating constant of the first transmission grating 3 is d1, where d1 / 2 ≦ r1 <15d1; the semi-cylindrical convex strip on the second transmission grating 4 (labeled 411 in the drawing), and its curvature radius is r2, the grating constant of the second transmission grating 4 is d2, where d2 / 2 ≦ r2 <15d2; the first transmission grating and the second transmission grating are stacked and arranged in a form where the major axis directions cross each other.

There are four main properties of gratings: dispersion, beam splitting, polarization, and phase matching. Anisotropic beam splitting is the optical properties of gratings. When a lens with a semi-cylindrical convex strip is provided, 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. In the end, 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.

In this embodiment, 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;

In this embodiment, 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. However, this application is not limited to this. In other embodiments, 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 °. Similarly, 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.

In this embodiment, in this embodiment, 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. However, this application is not limited to this. In other embodiments, 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.

In this embodiment, referring to FIG. 4, 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. However, this application is not limited to this. In other embodiments, 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.

Similarly, 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;

In other embodiments, as shown in FIG. 6, 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:

(1) 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.

(2) 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;

In another embodiment, as shown in FIG. 7, 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. Laminated configuration; the other side of the first transmission grating 3 is the light-receiving surface of the LED light beam, and the other side of the second transmission grating 4 is the light-emitting surface of the LED light beam.

In the above embodiments, 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.

In the above embodiment, for the optical lens 2 or the LED display screen, when a side surface provided with a semi-cylindrical convex strip is used as the exit surface, the side surface may replace the AG surface or AR anti-reflection surface.

The following describes the principle of this embodiment:

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.

After the light beam emitted by the pixel unit 11 of the LED lamp passes through the first transmission grating 3, its 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. When 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:

Xo = j (λ / d) f,

Distance between two adjacent diffraction orders: ΔXo = (λ / d) f

Where j = (0, ± 1, ± 2, ± 3 ...), f is the grating focal length, d is the grating constant, λ is the beam wavelength, and Xo is the position of each diffraction order.

It can be seen that when d increases or f decreases, the distance between adjacent diffraction orders decreases, and vice versa. Therefore, as long as d and f are set, the width and uniformity of the focal line can be controlled.

In this embodiment, given the thickness h of the first transmission grating 3 is 0.28mm, the grating constant is d, r is the radius of curvature, n is the refractive index, and the PET material is used, and the refractive index is n = 1.514, and d / 2 ≦ r <15d. 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.

When the distance f between the first transmission grating 3 and the LED display pixel 11 is within a range of 2.8 to 3.0 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). At this time, r = d, and its light intensity is approximately "flat "Top" distribution, from the middle of the "flat top" to the two sides, the light intensity fluctuations gradually increase, to the "flat top" edge of the last valley, peak fluctuation is the largest; the long axis direction of this focal line and the first transmission grating 3 The long axis direction intersects at 90 degrees, and this line domain is the first line domain 3111. When the distance f between the first transmission grating 3 and the LED display pixel 11 is less than 2.8mm, the smaller the distance, the closer the light intensity distribution is to "Gaussian" Like the distribution, which is the largest in the middle, it gradually decreases on both sides. When the distance f between the first transmission grating 3 and the pixel 11 of the LED display screen is greater than 2.8 mm, adjacent light intensity distributions begin to cross and affect each other.

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. In the direction of the long axis of the second transmission grating 4, When the beam splitting in the 90-degree cross direction is a focal length of 2.5 mm * width 2.5 mm, when 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.

In this embodiment, 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. .

In another embodiment, given the thickness h of the first transmission grating 3 is 0.28mm, the grating constant is d, r is the radius of curvature, n is the refractive index, and the PET material is used, and the refractive index is n = 1.514, d / 2. ≦ r <15d. A second transmission grating 4 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.

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.

Adjust the position of the first transmission grating 3 to the pixel unit 11 of the LED lamp. When the distance f between the first transmission grating 3 and the pixel unit 11 of the LED lamp is within a range of 1.4 to 1.6 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). At this time r = d, its light intensity is uniformly distributed in a similar “flat-top” shape. From the middle of the “flat-top” to both sides, the light intensity fluctuation gradually increases to the last valley and peak fluctuation of the “flat-top” edge. To form a 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 When 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. When 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. When the second focal range of mm is 9 × 9 rectangular diaphragms 21 composed of the first transmission grating 3 and the second transmission grating 4 stacked and crossed, 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.

In this embodiment, 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. .

Taking the above-mentioned ideal embodiment according to the present invention as a revelation, through the above-mentioned description content, the related staff can make various changes and modifications within the scope of not departing from the technical idea of the present invention. The technical scope of this invention is not limited to the content of the description, and its technical scope must be determined according to the scope of the claims.

Claims

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.
The optical lens for an LED display screen according to claim 1, characterized in that: 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, opposite The other side of the first transmission grating is the light-receiving surface of the LED light beam, and the other side of the second transmission grating is the light-emitting surface of the LED light beam.
The optical lens for an LED display screen according to claim 1, characterized in that: 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; One side of the first transmission grating provided with semi-cylindrical protrusions is a light-receiving surface, and one side of the second transmission grating provided with semi-cylindrical protrusions is a light-emitting surface.
The optical lens for an LED display screen according to claim 1, wherein the first transmission grating is provided with a side surface having a semi-cylindrical protrusion and the second transmission grating is provided with a side surface having a semi-cylindrical protrusion. , Cascade configuration 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 for an LED display screen according to any one of claims 1-4, wherein the optical lens for the LED display screen is a split structure, and the split first transmission grating and the split second The transmission grating is combined; or the first transmission grating and the second transmission grating of the optical lens of the LED display screen are an integrated structure.
The optical lens for an LED display screen according to claim 5, wherein the long axis direction of the semi-cylindrical convex strip of the first transmission grating intersects with the long axis direction of the semi-cylindrical convex strip of the second transmission grating Arranged at 90 °.
The optical lens for an LED display screen according to any one of claims 1 to 4, wherein the first transmission grating and the second transmission grating are semi-curved cylindrical transmission gratings and semi-polygonal cylindrical transmission gratings. Either.
An LED display screen, comprising: a display screen main body provided with a pixel unit of LED lights; and the LED display according to any one of claims 1 to 7 connected to the display screen main body and arranged on a light irradiation path. Screen optical lens; on the front projection surface of the display screen main body, any one of the LED light pixel units provided on the display screen main body corresponds to a number of slits of the first transmission grating greater than 2, corresponding to The number of the slits of the second transmission grating is greater than two.
The LED display screen according to claim 8, wherein the LED light pixel units on the display screen body are arranged in an array.