Eye-protection micro-distance rear projection MIP LED display screen

Abstract

The utility model relates to an eye-protection micro-distance rear projection MIP LED display screen which comprises a substrate layer, MIP LED packaging bodies, a soft light cover, an anti-reflection layer and a sub-wavelength grating structure layer. The MIP LED packaging bodies are distributed on the substrate layer in an array mode. The soft light cover is arranged on the substrate layer and covers the MIP LED packaging bodies, a plurality of containing cavities are formed in the side, facing the substrate layer, of the soft light cover, a plurality of prism parts are arranged on the side, deviating from the substrate layer, of the soft light cover, and the positions and the number of the containing cavities and the prism parts correspond to those of the MIP LED packaging bodies respectively; the anti-reflection layer is arranged on the surface of the side, provided with the prism part, of the soft light cover; and the sub-wavelength grating structure layer is arranged on the anti-reflection layer. Wherein the soft light cover can homogenize an original LED point light source into an area light source as much as possible, so that the light homogenizing and soft light effects are achieved, and the pixel granular sensation and the dazzling highlight sensation of the LED screen are relieved; the sub-wavelength grating structure layer can effectively block blue light, reduce potential damage of the blue light to human eyes and improve the eye protection effect.

Description

TECHNICAL FIELD

[0001] The utility model relates to display field, especially involve an eye -protecting micro -distance back -projection MIP LED display screen. BACKGROUND

[0002] MIP LED is Micro LED in Package, it is a new type of packaging architecture based on Micro LED, the core of MIP technology is to separate the whole display panel of large area and package, so that the yield control under smaller area will be greatly improved, and the test link is moved from the chip to the packaging section, which will effectively reduce the cost and improve the rate. The emergence of MIP technology provides a new possibility for Micro LED industrialization, especially in improving production efficiency and reducing cost. With the further development and maturity of technology, MIP is expected to play an increasingly important role in the field of LED display.

[0003] Regardless of the development of packaging technology, for users, high-quality display effect and eye protection effect are always concerned. MIP LED technology can reduce the cost and improve the rate, but from the display principle, it is still based on LED display, and there will still be pixel grain feeling and dazzling highlight.

[0004] In addition, as we all know, blue light can cause visual fatigue, vision decline and dry eyes and other symptoms, and it has high destructive nature to the eyes, and blue light also exists in LED screens. Therefore, LED screens also need to improve the eye protection function to meet the eye protection needs of users. INVENTION CONTENT

[0005] The utility model aims at solving above-mentioned problem, and provides an eye -protecting micro -distance back -projection MIP LED display screen.

[0006] In order to solve the above-mentioned problems, an eye -protecting micro -distance back -projection MIP LED display screen is provided, characterized in that it comprises:

[0007] A substrate layer is provided.

[0008] A MIP LED package is arranged in an array on the substrate layer.

[0009] A soft light cover is arranged on the substrate layer and covers the MIP LED package, the side of the soft light cover facing the substrate layer is provided with a plurality of cavities, and the side of the soft light cover away from the substrate layer is provided with a plurality of prism portions, the positions and numbers of the cavities and prism portions correspond to the MIP LED package respectively.

[0010] A light transmission layer is arranged on the side surface of the soft light cover provided with the prism portion.

[0011] A subwavelength grating structure layer is arranged on the antireflection layer.

[0012] Further, the MIP LED encapsulates are respectively located in the cavities, the cavities are respectively provided with spherical surfaces, the spherical centers of the spherical surfaces are distributed in the same plane, and the spherical centers are located in the plane where the MIP LED encapsulates are located.

[0013] Further, the prisms are spaced from each other, and a light-transmitting material is filled between the prisms, and the light-transmitting material forms a light-transmitting part.

[0014] Further, the surface of the light-transmitting part is flush with the surface of the prisms.

[0015] Further, the antireflection layer is an optical-grade high-transparency PET or PC film with a light transmittance greater than 95% and a haze less than 1%, and the thickness of the antireflection layer is 20-500 um.

[0016] Further, the subwavelength grating structure layer is provided with a plurality of grating parts arranged at intervals according to a period, the duty cycle of the grating parts is 0.4-0.5, the depth of the grating parts is 150-200 nm, the width of the grating parts is 70-90 nm, and the period of the grating parts is 150-300 nm.

[0017] Further, the light-transmitting part is formed by filling a material containing a blue light absorber in the prisms and curing.

[0018] The eye-protecting micro-distance back-projection MIP LED display screen has the advantages of novel structure and practical function, has strong practicability, and is suitable for being widely promoted. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a schematic view of the overall structure of the utility model.

[0020] Figure 2 is a schematic view of the structure of the soft light cover.

[0021] The drawing mark: substrate layer 10, MIP LED package 20, soft light cover 30, cavity 31, spherical surface 311, prism part 32, anti-reflection layer 40, sub-wavelength grating structure layer 50, grating part 51, light transmission part 60. DETAILED DESCRIPTION

[0022] The following examples are further explanations and supplements of the present application, which do not constitute any limitation on the present application.

[0023] As shown in Figure 1 , Figure 2 , the eye-protecting micro-distance back-projection MIP LED display screen of the present application comprises a substrate layer 10, a MIP LED package 20, a soft light cover 30, an anti-reflection layer 40 and a sub-wavelength grating structure layer 50.

[0024] The substrate layer 10 is used to carry the MIP LED package 20, and its structure size can be set as required. As a preferred, in order to improve the display contrast, the substrate layer 10 can be made of black material. With black as the substrate, the picture contrast can be effectively improved, and the interference of other environmental light can be reduced.

[0025] The MIP LED (Mini / Micro LED in Package) package refers to an encapsulation structure formed by chip-level encapsulation and cutting of mini / MICRO LED chips through MIP encapsulation technology.

[0026] The MIP encapsulation technology can be summarized as the following key steps:

[0027] Chip mass transfer: the first step of MIP encapsulation technology is to transfer Micro LED chips to the substrate through mass transfer technology. It is a high-precision process that can transfer a large number of tiny LED chips from the growth substrate to another substrate (such as PCB) while maintaining high yield and precise position control of the chips.

[0028] Chip packaging: after the transfer is completed, the Micro LED chips are packaged on the substrate. The packaging process includes using conductive or non-conductive glue to adhere the chips and performing wire bonding to achieve electrical connection. The packaging material not only protects the chips from the external environment, but also provides good heat dissipation performance to ensure the stable operation of the LED chips.

[0029] Cut into small packages: the packaged large-area LED array is cut into multiple small packages. These small packages can be single LED chips or small modules composed of multiple LED chips. The cutting process requires high-precision equipment and technology to ensure that the size and shape of each small package meet the design requirements.

[0030] Light splitting and mixing: the small package after cutting needs to be treated by light splitting and mixing. This step ensures the color uniformity and consistency of the entire display screen by precisely controlling the light emitted by each LED chip. Light splitting and mixing technology is one of the keys to realizing high-quality display screens.

[0031] The small package after light splitting and mixing is the MIP LED package 20 of the utility model, which can be attached to the backboard of the display screen, i.e. the substrate layer 10 of the utility model. Then the other steps of the display screen are completed through the screen surface coating process.

[0032] The soft light cover 30 is used to scatter the direct light emitted by the MIP LED package 20 into surface light, thereby forming a macro back projection effect and relieving the pixel grain feeling and dazzling highlight feeling of the LED screen.

[0033] The soft light cover 30 is arranged on the substrate layer 10 and covers the MIP LED package 20. The soft light cover 30 is an integral structure, which is made of a light-transmitting material. In this embodiment, it is made of high-transparency PET material.

[0034] The side of the soft light cover 30 facing the substrate layer 10 is provided with a plurality of cavities 31, and the positions and numbers of the cavities 31 correspond to the positions and numbers of the MIP LED packages 20. Each MIP LED package 20 is located in a cavity 31 and is covered by the soft light cover 30.

[0035] Further, the cavities 31 are provided with spherical curved surfaces 311, and the centers of the spherical curved surfaces 311 are distributed in the same plane, which is the plane where the MIP LED packages 20 are located. Among them, the plane where the MIP LED packages 20 are located refers to the plane parallel to the substrate layer 10, and the highest does not exceed the plane where the top of the MIP LED package 20 is located.

[0036] The side of the soft light cover 30 away from the substrate layer 10 is provided with a plurality of prism portions 32. The positions and numbers of the prism portions 32 correspond to the positions of the MIP LED packages 20, respectively. In other words, each prism portion 32 and cavity 31 corresponds to the position of the MIP LED package 20, and they are uniformly arranged.

[0037] The shape of the prism portion 32 can be set as needed. In some embodiments, it can be a prism portion 32 in the shape of a spherical curved surface 311. In this embodiment, it is a prism structure in the shape of a four-sided truncated pyramid, and the top is a plane, which is convenient for setting the anti-reflection layer 40.

[0038] When the MIP LED package 20 emits light, the light first refracts through the spherical surface 311 of the cavity 31, and then refracts through the surface of the prism portion 32, thereby changing the original light transmission angle, diversifying the transmission angle, and homogenizing the original point light source into a surface light source as much as possible, thereby achieving the effects of uniform light and soft light, relieving the pixel grain feeling and the glaring highlight feeling of the LED screen, and forming a macro back projection effect.

[0039] Further, the prism portions 32 are spaced from each other. In order to facilitate the arrangement of the anti-reflection layer 40, the prism portions 32 are filled with a light-transmitting material, and the light-transmitting material forms a light-transmitting portion 60. Preferably, the surface of the light-transmitting portion 60 is flush with the surface of the prism portion 32.

[0040] Further, the refractive index of the light-transmitting portion 60 is different from the refractive index of the soft light cover 30. When light enters the interface between the light-transmitting portion 60 and the soft light cover 30, the light will further refract, further improving the diversity of the light transmission angle, and further improving the display effect of the surface light source.

[0041] Further, in order to improve the eye protection effect, the light-transmitting portion 60 is filled with a material containing a blue light absorber and is formed by solidification. In this way, the light-transmitting portion 60 also has the effect of absorbing blue light, thereby improving the eye protection effect.

[0042] The anti-reflection layer 40 is arranged on the side surface of the soft light cover 30 where the prism portion 32 is arranged. The anti-reflection layer 40 is selected from optical-grade high-transparency PET or PC film with a light transmittance greater than 95% and a haze less than 1%, and the thickness is 20-500 um. The principle of the anti-reflection layer 40 is to use the interference effect of light to reduce the reflection of light at the interface, thereby increasing the proportion of transmitted light. When light strikes the interface between two smooth and parallel media, if the optical path difference of the reflected light waves of the two interfaces is zero or an integer multiple of the wavelength, constructive interference occurs; if the optical path difference is half a wavelength, destructive interference occurs. The design of the anti-reflection layer 40 is based on the latter. By selecting appropriate materials and film thicknesses, the reflected light of the two surfaces before and after the film undergoes destructive interference, thereby reducing the reflected light and increasing the transmitted light.

[0043] The sub-wavelength grating structure layer 50 is arranged on the anti-reflection layer 40 and is used for anti-blue light to improve the eye protection effect. The sub-wavelength grating structure layer 50 is provided with a plurality of grating portions 51 arranged at intervals according to a period. The duty cycle of the grating portion 51 is 0.4-0.5, the depth of the grating portion 51 is 150-200 nm, the width of the grating portion 51 is 70-90 nm, and the period of the grating portion 51 is 150-300 nm.

[0044] The grating period of the subwavelength grating structure layer 50 can affect the position of the spectral peak, and by adjusting the grating period, the blocking of specific wavelengths, such as blue light, can be achieved. When the grating period is much smaller than the wavelength of the incident light, the subwavelength grating layer can be equivalent to a layer of uniform film with a refractive index between the incident layer and the substrate, so that the transmission enhancement can be realized in the visible light band. The duty cycle and depth of the subwavelength grating structure have a significant impact on the reflection efficiency, and by reasonably setting the parameters, the transmission light can be enhanced, especially for the blocking of blue light. The subwavelength grating structure layer 50 can effectively block blue light, reduce the potential harm of blue light to the human eye, and improve the eye protection effect.

[0045] Although the utility model has been disclosed through the above embodiments, the scope of the utility model is not limited thereto, and under the condition of not deviating from the utility model concept, each component can be replaced by similar or equivalent elements understood by those skilled in the art.

Claims

1. An eye-protecting macro back-projection MIP LED display screen, characterized in that, It includes: a substrate layer (10); MIP LED packages (20) arranged in an array on the substrate layer (10); a soft light cover (30) arranged on the substrate layer (10) and covering the MIP LED packages (20), the soft light cover (30) being provided with cavities (31) on the side facing the substrate layer (10), and being provided with prisms (32) on the side away from the substrate layer (10), the positions and numbers of the cavities (31) and prisms (32) corresponding to the MIP LED packages (20) respectively; an anti-reflection layer (40) arranged on the side of the soft light cover (30) provided with the prisms (32); a sub-wavelength grating structure layer (50) arranged on the anti-reflection layer (40).

2. The eye-protecting micro-viewing distance rear-projection MIP LED display screen of claim 1, wherein, The MIP LED packages (20) are respectively arranged in the cavities (31), and each cavity (31) is provided with a spherical surface (311), the centers of the spherical surfaces (311) being arranged in the same plane, and the plane being the plane where the MIP LED packages (20) are arranged.

3. The eye-protecting micro-viewing distance rear-projection MIP LED display screen of claim 2, wherein, The prisms (32) are spaced from each other, and the space between the prisms (32) is filled with a light-transmitting material, which forms a light-transmitting part (60).

4. The eye-protecting micro-viewing distance rear-projection MIP LED display screen of claim 3, wherein, The surface of the light-transmitting part (60) is flush with the surface of the prisms (32).

5. The eye-protecting micro-viewing distance rear-projection MIP LED display screen of claim 4, wherein, The anti-reflection layer (40) is an optical-grade high-transparency PET or PC film with a light transmittance greater than 95% and a haze less than 1%, and the thickness is 20-500 um.

6. The eye-protecting micro-viewing distance rear-projection MIP LED display screen of claim 5, wherein, The sub-wavelength grating structure layer (50) is provided with a plurality of grating parts (51) arranged at intervals according to a period, the duty cycle of the grating parts (51) is 0.4-0.5, the depth of the grating parts (51) is 150-200 nm, the width of the grating parts (51) is 70-90 nm, and the period of the grating parts (51) is 150-300 nm.

7. The eye-protecting micro-viewing distance rear projection MIP LED display screen of claim 6, wherein, The light-transmitting part (60) is formed by filling the prisms (32) with a material containing a blue light absorber and then curing.

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