CN218763000U

CN218763000U - Light scattering assembly and LED display screen

Info

Publication number: CN218763000U
Application number: CN202222920002.5U
Authority: CN
Inventors: 李艳龙
Original assignee: Shenzhen Timewaying Technology Co ltd
Current assignee: Shenzhen Timewaying Technology Co ltd
Priority date: 2022-11-01
Filing date: 2022-11-01
Publication date: 2023-03-28
Anticipated expiration: 2032-11-01

Abstract

The utility model is suitable for a LED shows technical field, provides a light scattering subassembly and LED display screen, the light refraction subassembly is used for pasting on LED area source, including transparent rete; one surface of the transparent film layer is provided with an irregular concave-convex structure; or the transparent film layer is doped with transparent particles, and the optical refractive index of the transparent particles is greater than that of the transparent film layer. The light scattering component provided by the utility model comprises a transparent film layer, wherein the surface of the transparent film layer is provided with an irregular concave-convex structure or transparent particles with larger refractive index, and when light reaches the concave-convex structure on the surface, the light is scattered; the size and the height of the concave-convex structure are adjusted, so that scattering in different directions can be realized; or due to the difference of the refractive indexes between the transparent film layer and the doped transparent particles, the whole LED surface light source can show the characteristic that light is scattered, so that the light intensity of the LED surface light source in a light-emitting visual angle is uniformly distributed.

Description

Light scattering assembly and LED display screen

Technical Field

The utility model belongs to the technical field of the LED shows, especially, relate to a light scattering subassembly and LED display screen.

Background

Film cinematographs were used for early film projection, and digital cinema projectors based on DMD projection display technology of texas instruments in the united states replaced film cinematographs for nearly 20 years, which were the dominant cinema projector in the market. With the development of LED display technology, it has become possible for LED display screens to replace digital cinema projectors for cinema movie projection, and it is expected to become a next generation cinema projection technology.

Before entering a Cinema to play a Digital movie with formal copyright, the LED display screen needs to pass a DCI (Digital Cinema Initiatives) test. In order to meet the HDR (High Dynamic Range) and higher intra-frame contrast, the DCI requires that the surface reflectance of the LED cinema screen is not higher than 10%, and some manufacturers blacken non-light-emitting areas in pixels of the LED cinema screen to reduce the surface reflectance in consideration of the characteristic of small light-emitting areas of LEDs. However, for an LED film screen with a slightly large dot spacing, because the luminous intensity of the luminous part of the LED is high, and the non-luminous part is black, the problems of dazzling and obvious picture graininess can occur during actual viewing.

In order to solve the problems of dazzling and granular sensation of a picture, the point-like light emission of the LEDs needs to be expanded into light emission of the LED pixel surface through a light homogenizing structure, so that the light emission intensity on a unit area is reduced, and the light emitting area is increased. After the light emitted by the LED point-like light is expanded into surface light, the light emitted by the light-emitting surface in all directions is often not uniform enough, and the light intensity sensed at different positions is inconsistent.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is at predetermined angular range for the light intensity evenly distributed who how makes the light that sends of LED area source.

In order to solve the above technical problem, in a first aspect, the present invention provides a light scattering assembly, wherein the light refraction assembly is used for being adhered to an LED surface light source and comprises a transparent film layer; one surface of the transparent film layer is provided with an irregular concave-convex structure; or the transparent film layer is doped with transparent particles, and the optical refractive index of the transparent particles is greater than that of the transparent film layer.

Further, the difference between the optical refractive index of the transparent particles and the optical refractive index of the transparent film layer is above 0.05.

Further, a light absorption material is added into the transparent film layer, and the light transmittance of the transparent film layer is between 20% and 70%.

Further, the transparent film layer is a flexible transparent film layer; the light scattering component further comprises a spherical crown, and the flexible transparent film layer is adhered to the convex surface of the spherical crown.

Further, the haze of the light scattering component is between 70% and 98%.

Further, an external light suppression component is pasted on the light scattering component.

Further, the external light inhibition component is a semi-permeable film layer or a linear polarizer or a circular polarizer with the visible light transmittance of 20-70%; the circular polarizer comprises a quarter wave plate and a linear polarizer which are sequentially arranged along the propagation direction of emergent rays.

Further, the light scattering component and the external light inhibiting component are sequentially arranged along the light path direction; or the external light suppression component and the light scattering component are sequentially arranged along the light path direction.

Further, one surface of the light scattering component with the irregular concave-convex structure is used as a light incidence surface; or one surface of the light scattering component with the irregular concave-convex structure is used as a light emergent surface.

Further, the total haze of the light scattering component and the ambient light suppressing component is between 70% and 98%.

In a second aspect, the present invention further provides a LED display screen, which comprises a plurality of LED pixel units and a plurality of light guide assemblies, each of which is provided with the light scattering assembly.

The light scattering component provided by the utility model comprises a transparent film layer, the surface of the transparent film layer is provided with an irregular concave-convex structure or is doped with transparent particles with larger refractive index, and when light reaches the concave-convex structure on the surface, the light is scattered; the size and the height of the concave-convex structure are adjusted, so that scattering in different directions can be realized; or due to the difference of the refractive indexes between the transparent film layer and the doped transparent particles, the whole LED surface light source can show the characteristic that light is scattered, so that the light intensity of the LED surface light source in a light-emitting visual angle is uniformly distributed.

Drawings

Fig. 1 is a structural diagram of a light scattering assembly according to a first embodiment of the present invention;

fig. 2 is a structural view of another light scattering member according to the first embodiment of the present invention;

fig. 3 is a structural diagram of another light scattering component provided in the first embodiment of the present invention on the basis of the structures shown in fig. 1 and fig. 2;

fig. 4 is a schematic diagram illustrating an operation of the ambient light suppressing member according to the second embodiment of the present invention when a circular polarizer is used;

fig. 5A is a structural diagram of a first external light suppressing member and a first light scattering member attached to each other according to a second embodiment of the present invention;

fig. 5B is a structural diagram of a second external light suppressing member and a light scattering member attached to each other according to a second embodiment of the present invention;

fig. 5C is a third structure diagram of the external light suppressing component and the light scattering component adhered together according to the second embodiment of the present invention;

fig. 5D is a structural diagram illustrating a fourth kind of adhesion between the external light suppressing component and the light scattering component according to the second embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The utility model discloses the light scattering subassembly that the first embodiment provided is used for pasting on LED area light source, and wherein, this LED area light source can be that the LED pointolite obtains after the beam expanding treatment.

The light scattering component provided by the embodiment can be made of transparent materials, and two structural designs are provided, which are respectively as follows:

as an implementation, as shown in fig. 1, the light scattering member 1 includes a transparent film layer 10, and one surface of the transparent film layer 10 is provided with an irregular concave-convex structure 11, and when light reaches the concave-convex structure of the surface, the light will be scattered. The size and the height of the concave-convex structure are adjusted, and scattering in different directions can be realized.

As another implementation, as shown in fig. 2, the light scattering component 1 includes a transparent film 10 made of a low refractive index material, the transparent film 10 is doped with transparent particles 12 with a high refractive index, and the refractive index of the transparent particles 12 for light is greater than the optical refractive index of the transparent film 10, and the difference between the two optical refractive indices is preferably above 0.05. When light passes through the interface of the two materials, the light is refracted when entering the high-refractive-index material from the low-refractive-index material due to the difference of refractive indexes; when light enters the low refractive index material from the high refractive index material, if the incident angle is larger than the total reflection angle, total reflection occurs, and when the incident angle is smaller than the total reflection angle, refraction with a larger angle occurs; after multiple refractions and reflections, the light penetrates the light scattering component 1 and is scattered. The scattering direction of the light can be adjusted by adjusting the proportion and the size of the high-refractive-index particles. The haze value of the light scattering component 1 is related to the light scattering direction, the greater the haze, the closer the scattering property is to the scattering of lambertian bodies, and the smaller the haze, the closer the haze is to the transparency, and the light will not be scattered. Preferably, the haze of the light scattering component 1 is between 70% and 98%.

Further, the transparent film layer 10 is added with a light absorption material, and the light transmittance of the transparent film layer 10 is controlled to be between 20% and 70%.

On the basis of fig. 1 and 2, as shown in fig. 3, the light scattering assembly 1 further includes a spherical cap 13, and the transparent film 10 is a flexible transparent film made of a flexible material. The convex surface of the spherical cap 13 faces the transparent film layer 10, and the transparent film layer 10 is directly adhered to the convex surface of the spherical cap. Because the radian effect of the convex surface of the spherical crown 13 further strengthens the uniformity of light, and simultaneously has a certain light scattering effect, the light scattering effect can be carried out again by matching the flexible transparent film layer 10 which is stuck on the spherical crown 13, so that the luminous visual angle is greatly increased, and the light scattering effect is very strong.

After the scattering of light scattering subassembly 1, light propagates to predetermined direction, and the degree of consistency and the visual angle of light have all reached the preferred state this moment, but can present a problem, and when the LED pixel is not luminous, the surface of light scattering subassembly 1 can receive the influence of external light shines and present white, influences the sight shadow effect. Since the light is scattered and reflected after the external light is irradiated to the light scattering layer 1, the reflectivity is higher than 20%. Too high reflectivity will directly reduce the contrast ratio in the frame of the display picture of the LED panel, and therefore the surface reflectivity of the light guiding and diffusing structure needs to be further reduced. Therefore, the second embodiment of the present invention introduces the external light suppressing member for the requirement of the function expansion.

Referring to fig. 5A to 5D, the light scattering component 1 provided by the second embodiment of the present invention is further adhered with an external light suppressing component. The external light suppression component 2 is a semi-permeable film layer with visible light transmittance of 20-70%, or a linear polarizer or a circular polarizer, wherein the circular polarizer comprises a quarter wave plate and a linear polarizer which are sequentially arranged along the propagation direction of emergent light. Moreover, the total haze of the light scattering component 1 and the external light inhibiting component 2 still needs to be maintained between 70% and 98%.

Fig. 4 shows the working principle of the ambient light suppressing member provided in this embodiment when a circular polarizer is used. When external light enters the linear polarizer, light with the vibration direction perpendicular to the transmission axis of the linear polarizer is absorbed, and the rest light with the vibration direction parallel to the transmission axis of the linear polarizer is transmitted through the linear polarizer and is changed into first linearly polarized light; after passing through a 1/4 wavelength delay film which is arranged at an included angle of 45 degrees with the linear polarization angle, the first linearly polarized light is converted into first circularly polarized light, and the light intensity is basically unchanged; after the first circularly polarized light reaches the reflection surface, because the refractive index of the external light suppression component 2 is smaller than that of the solid light guide body or the scattering component 2, relatively speaking, the external light suppression component 2 is an optically thinner medium, the solid light guide body or the scattering component 2 is an optically denser medium, when incident light advances in the optically thinner medium and meets an interface of the optically denser medium, half-wave loss is generated in the reflection process, the vibration direction of the electric field intensity vector of the light and the vibration direction of the incident light are just opposite to each other and are converted into second circularly polarized light, when the second circularly polarized light with the opposite rotation direction passes through the original 1/4 wavelength retardation film again, the second circularly polarized light is converted into second linearly polarized light, but the polarization direction of the second linearly polarized light is perpendicular to that of the linear polarizer on the upper layer, and the light is absorbed after passing through the linear polarizer, so that the effect of suppressing the external light is achieved.

The light scattering component 1 and the ambient light suppressing component 2 may be flexibly arranged in a positional relationship, and the light scattering component 1 and the ambient light suppressing component 2 may be sequentially arranged along the light path direction, as shown in fig. 5A and 5C. Alternatively, the ambient light suppression component 2 and the light scattering component 1 are sequentially arranged along the optical path direction, as shown in fig. 5B and 5D.

In the case where the light scattering member 1 has the structure shown in fig. 1, since the irregular concave-convex structure 11 is disposed on the surface of the transparent film layer 10, the flatness of the surface is not ideal, and in order to ensure that the light scattering member 1 and the external light suppressing member 2 are well adhered, it is necessary to use the surface of the light scattering member 1 having the irregular concave-convex structure 11 as a light incident surface, as shown in fig. 5A, or use the surface of the light scattering member 1 having the irregular concave-convex structure 11 as a light emitting surface, as shown in fig. 5B.

The utility model discloses the third embodiment provides a LED display screen, including a plurality of LED pixel and a plurality of light scattering subassembly as in the above first embodiment or the second embodiment, can all cover on every LED pixel and establish a light scattering subassembly specifically.

Above-mentioned LED pixel cell can be the area source, obtains after expanding the beam by the LED pointolite, and the characteristic of area source is generally that the light beam is whole to be propagated towards a direction, and luminous visual angle is less, handles the back through above-mentioned light scattering component, can make the light intensity of the light that the LED area source sent obtain evenly distributed at luminous visual angle.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. The light scattering component is used for being pasted on an LED area light source and comprises a transparent film layer;

one surface of the transparent film layer is provided with an irregular concave-convex structure; or the transparent film layer is doped with transparent particles, and the optical refractive index of the transparent particles is greater than that of the transparent film layer.

2. The light-scattering component of claim 1, wherein the difference between the optical refractive index of the transparent particles and the optical refractive index of the transparent film layer is greater than 0.05.

3. The light diffusing assembly of claim 1, wherein the transparent film layer has a light absorbing material added thereto, and wherein the transparent film layer has a light transmission of between 20% and 70%.

4. The light-scattering assembly of claim 1, wherein the transparent film layer is a flexible transparent film layer;

the light scattering component further comprises a spherical crown, and the flexible transparent film layer is adhered to the convex surface of the spherical crown.

5. The light-scattering assembly of claim 1, wherein the light-scattering assembly has a haze of between 70% and 98%.

6. The light diffusing component of claim 1, wherein an ambient light inhibiting component is affixed to said light diffusing component.

7. The light-scattering element as claimed in claim 6, wherein the external light suppressing element is a semi-permeable film layer having a visible light transmittance of 20 to 70%, or a linear polarizer or a circular polarizer;

the circular polarizer comprises a quarter wave plate and a linear polarizer which are sequentially arranged along the propagation direction of emergent rays.

8. The light scattering component of claim 6 or 7, wherein the light scattering component and the ambient light suppressing component are arranged in order along the light path direction;

or the external light suppression component and the light scattering component are sequentially arranged along the light path direction.

9. The light-diffusing member according to claim 8, wherein a surface of the light-diffusing member having the irregular asperity structure serves as a light incident surface;

or one surface of the light scattering component with the irregular concave-convex structure is used as a light emergent surface.

10. The light-scattering assembly of claim 6, wherein the light-scattering assembly and the ambient light suppression assembly have a total haze of between 70% and 98%.

11. An LED display screen comprising a plurality of LED pixel units and a plurality of light diffusion assemblies as claimed in any one of claims 1 to 10, wherein each of said LED pixel units is covered by said light diffusion assembly.