Diffusion film

Abstract

The utility model discloses a diffusion film, and aims to overcome the defects that the temperature of a screen is high, the imaging effect is affected and eyes are injured due to the fact that an existing optical film cannot effectively intercept blue light and cannot conduct efficient heat conduction. The blue light absorbing film sequentially comprises a surface rough layer, a heat conduction layer, a PET layer and a blue light absorbing layer from top to bottom, the heat conduction layer is a coating composed of high-heat-conductivity particles and epoxy resin, a blue light absorbent is arranged in the blue light absorbing layer, and the blue light absorbent has intrinsic absorptivity for blue light. The diffusion film is generated through the surface rough layer, the heat conduction layer, the PET layer and the blue light absorption layer, blue light interception and efficient heat conduction are both considered, efficient heat transfer is conducted while blue light is absorbed, heat accumulation on a screen is avoided, damage of blue light to eyes is effectively reduced, and the service life of the backlight module is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of optical films, and more specifically, to a diffusion film. Background Art

[0002] The booming development of liquid crystal display technology has made liquid crystal displays widely used in computers, mobile phones, televisions, navigation systems, digital cameras and other instrument displays. Liquid crystal displays include liquid crystal display panels and backlight modules. The backlight module is an important component of liquid crystal displays. Its main function is to provide a high-brightness, high-uniformity surface light source for the liquid crystal display panel of the liquid crystal display. Related to it, there is further development in the liquid crystal flat panel display device - diffusion film. The diffusion film is an important optical element that transmits light beams through the interface to achieve certain optical functions. The light-emitting surface of the diffusion film has a diffusion layer structure. Its main function is to refract and reflect the incident light, concentrate the light from a small angle to the front to increase the brightness of the front, and play a fogging role to improve the uniformity of the LCD screen.

[0003] For electronic display products based on LED light source technology and OLED new flat panel display technology, blue light, as one of the three primary colors of light, is essential in full-color display. Therefore, to achieve colorful picture display, the screen will inevitably emit a certain amount of blue light. Blue light has been observed to cause photochemical damage to retinal photoreceptors and pigment epithelial cells, leading to retinal diseases such as age-related macular degeneration and visual fatigue. In addition, the existing backlight module LED light source, whether direct or side-entry, has a large amount of power consumption converted into heat, which increases the system temperature because the current LED light source has a photoelectric conversion rate of only 30%. As a result, the current method is increasingly struggling in heat dissipation, resulting in excessive temperature and affecting the luminous intensity and color purity of the LED light source itself. If the edges close to the LED light bar are heated unevenly, there will be varying degrees of warping or spacing changes, resulting in uneven screen display, which is what the industry calls the LCD screen Mura defect.

[0004] In summary, existing optical films cannot effectively intercept blue light and conduct heat efficiently, causing the screen temperature to be high, affecting imaging effects and damaging the eyes. Summary of the invention

[0005] The utility model overcomes the shortcomings of existing optical films that are unable to effectively intercept blue light and conduct heat efficiently, which results in a high screen temperature, affects imaging effects and damages the eyes, and provides a diffusion film that can take into account both blue light interception and efficient heat conduction, and efficiently transfers heat while absorbing blue light, thereby avoiding heat accumulation on the screen, effectively reducing blue light damage to the eyes and extending the service life of the backlight module.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A diffusion film comprises, from top to bottom, a surface roughness layer, a heat conductive layer, a PET layer and a blue light absorption layer, wherein the heat conductive layer is a coating composed of high thermal conductivity particles and epoxy resin, and a blue light absorber is arranged in the blue light absorption layer, and the blue light absorber has intrinsic absorption to blue light.

[0008] The existing diffusion film generally includes a surface roughness layer and a PET layer. On this basis, the present application further adds a heat-conducting layer and a blue light absorption layer. The heat-conducting layer uses particles with high thermal conductivity as fillers, which are added to the epoxy resin as hybrid fillers. The size compatibility and dimensional complementarity between the fillers are used to create more contact sites for each other, and a hybrid network is constructed, so that a better heat conduction path is formed in the coating, and the heat transfer efficiency of the diaphragm is increased. The blue light absorber is used to absorb light of a specific frequency. The present application uses an absorber that is sensitive to blue light. Through the above structure, it is possible to take into account both intercepting blue light and efficient heat conduction. While absorbing blue light, efficient heat transfer is performed to avoid heat accumulation on the screen, effectively reducing the damage of blue light to the eyes and extending the service life of the backlight module.

[0009] Preferably, the surface of the rough surface layer is treated by corona treatment or pre-printing coating, and the treatment increases the haze of the rough surface layer.

[0010] Preferably, the high thermal conductivity particles include at least one of aluminum oxide, silicon dioxide particles, silicon nitride, aluminum oxide particles, boron nitride, and aluminum nitride. The particles can be used to enhance the thermal conductivity of the coating.

[0011] Preferably, the high thermal conductivity particles are fillers composed of boron nitride and aluminum nitride. Since the boron nitride with a hexavalent layered conjugated structure and the cubic aluminum nitride with a three-dimensional structure having good dimensional stability are different in size and dimension, they are added to the epoxy resin as hybrid fillers, and the size compatibility and dimensional complementarity between the fillers are used to create more contact sites for each other, and a hybrid network is constructed, so that a better heat conduction path is formed in the coating, a denser phonon transmission network is constructed, and the thermal conductivity of the coating is greatly improved. The thermal conductive layer 2 can effectively conduct heat and quickly dissipate heat, so that the surface and internal temperature of the optical film decrease, and finally the purpose of cooling and heat dissipation is achieved.

[0012] Preferably, the blue light absorber includes zinc oxide and titanium oxide. The intrinsic absorption characteristics of semiconductor materials are used to absorb specific short-wave blue light, thereby improving the absorption rate of short-wave blue light, and can effectively filter blue light with a wavelength shorter than 415-455nm, reducing damage to the eyes, while maintaining the high transmittance of other visible light greater than 500nm, reducing damage to the eyes.

[0013] Preferably, the material of the PET layer is polyethylene terephthalate.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The diffusion film produced by the rough surface layer, thermal conductive layer, PET layer and blue light absorption layer takes into account both blue light interception and efficient heat conduction. It absorbs blue light while performing efficient heat transfer to avoid heat accumulation on the screen, effectively reducing the damage of blue light to the eyes and extending the service life of the backlight module. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] In the figure:

[0018] Surface roughness layer 1, heat conducting layer 2, PET layer 3, blue light absorbing layer 4. DETAILED DESCRIPTION

[0019] The present disclosure is further described below in conjunction with the accompanying drawings and embodiments.

[0020] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0021] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0022] In the present disclosure, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present disclosure, and do not specifically refer to any part or element in the present disclosure and should not be understood as limitations on the present disclosure.

[0023] Example:

[0024] A diffusion membrane, Figure 1As shown, from top to bottom, it includes a surface roughness layer 1, a thermal conductive layer 2, a PET layer 3 and a blue light absorbing layer 4. The thermal conductive layer 2 is a coating composed of high thermal conductivity particles and epoxy resin. The blue light absorbing layer 4 is provided with a blue light absorber, which has intrinsic absorption of blue light.

[0025] The existing diffusion film generally includes a surface roughness layer 1 and a PET layer 3. On this basis, the present application further adds a heat-conducting layer 2 and a blue light absorption layer 4. The heat-conducting layer 2 uses particles with high thermal conductivity as fillers, which are added to the epoxy resin as hybrid fillers. The size compatibility and dimensional complementarity between the fillers are used to create more contact sites for each other, and a hybrid network is constructed, so that a better heat conduction path is formed in the coating, and the heat transfer efficiency of the diaphragm is increased. The blue light absorber is used to absorb light of a specific frequency. The present application uses an absorber that is sensitive to blue light. Through the above structure, it is possible to take into account both intercepting blue light and efficient heat conduction, and to carry out efficient heat transfer while absorbing blue light, thereby avoiding heat accumulation on the screen, effectively reducing the damage of blue light to the eyes and extending the service life of the backlight module.

[0026] The surface of the rough surface layer 1 is treated by corona treatment or pre-printing coating, which increases the haze of the rough surface layer 1 .

[0027] In some embodiments, the high thermal conductivity particles include at least one of aluminum oxide, silicon dioxide particles, silicon nitride, aluminum oxide particles, boron nitride, and aluminum nitride. The particles can all be used to enhance the thermal conductivity of the coating. In some preferred embodiments, the high thermal conductivity particles are fillers composed of boron nitride and aluminum nitride. Since the boron nitride presenting a hexavalent layered conjugated structure and the cubic aluminum nitride with a three-dimensional structure having good dimensional stability are different in size and dimension, they are added to the epoxy resin as hybrid fillers, and the size compatibility and dimensional complementarity between the fillers are used to create more contact sites for each other, and a hybrid network is constructed, so that a heat conduction path is better formed in the coating, and a more compact phonon transmission network is constructed, so that the thermal conductivity of the coating is greatly improved, and the thermal conductive layer 2 can effectively conduct heat and dissipate heat quickly, so that the surface and internal temperature of the optical film are reduced, and finally the purpose of cooling and heat dissipation is achieved.

[0028] The blue light absorber includes zinc oxide and titanium oxide. The intrinsic absorption characteristics of semiconductor materials are used to absorb specific short-wave blue light, thereby improving the absorption rate of short-wave blue light, and can effectively filter short-wavelength blue light of 415-455nm, reducing damage to the eyes, while maintaining the high transmittance of other visible light greater than 500nm, reducing damage to the eyes.

[0029] The material of the PET layer 3 is polyethylene terephthalate.

[0030] During the manufacturing process, the heat conducting layer 2 and the blue light absorbing layer 4 are coated on both sides of the PET layer 3 in the form of coatings, and then the surface roughness layer 1 is arranged on the surface.

[0031] The above-described embodiments are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A diffusion membrane, characterized in that: From top to bottom, it includes a surface roughness layer, a heat conductive layer, a PET layer and a blue light absorption layer. The heat conductive layer is a coating composed of high thermal conductivity particles and epoxy resin. The heat conductive layer is provided with a heat conductive path formed by a hybrid network. The blue light absorption layer is provided with a blue light absorber, and the blue light absorber has intrinsic absorption to blue light.

2. A diffusion membrane according to claim 1, characterized in that: The surface of the rough surface layer is treated by corona treatment or pre-printing coating.

3. A diffusion membrane according to claim 1 or 2, characterized in that: The material of the PET layer is polyethylene terephthalate.

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