A blue light filtering film and display device

Abstract

The present invention discloses a blue light filter film and a display device, the blue light filter film comprising: a substrate layer; a near-infrared light reflection layer, the near-infrared light reflection layer is located on the light-emitting side of the substrate layer; and a blue light blocking layer, the blue light blocking layer is located on the light-emitting side of the near-infrared light reflection layer. The blue light filter film is arranged in an existing display device, so that the light emitted in the existing display device passes through the near-infrared light reflection layer. The near-infrared reflection layer is used to reflect the near-infrared light, which can effectively reduce the substrate's absorption of heat and has a heat-insulating effect. After passing through the near-infrared light reflection layer, the light reaches the blue light blocking layer, which can block ultraviolet light and short-wavelength visible light, thereby reducing the blue light energy, so that high-energy harmful blue light can be filtered out, reducing damage to human eyes.

Description

Technical Field

[0001] The present invention relates to the field of display devices, and in particular to a blue light filtering film and a display device. Background Art

[0002] K12 and colleges and universities have begun to widely popularize the use of educational interactive large screens, and the frequency of use by students and teachers is often higher than that of ordinary people. Traditional LCD display large screens have a certain amount of blue light that has a certain impact or is harmful to the vision and eyes of people who watch them for a long time. Therefore, educational interactive large screens require truly healthy eye protection technology, which will become a rigid technical requirement.

[0003] Although the cornea and lens of the human eye can filter out ultraviolet UVB and most of UVA, short-wavelength blue-violet light with high energy can penetrate the lens and directly reach the retina, causing damage to the eyes. This short-wavelength blue-violet light is called high-energy blue light. The spectrum range of high-energy blue light is: 415-455nm (excluding the blue light spectrum with a wavelength of 455nm). High-energy blue light directly reaches the retina, causing photochemical damage to produce cytotoxic free radicals, causing retinal pigment epithelial cells to die, and light-sensitive cells to lack nutrients. In severe cases, it can induce macular degeneration, cataracts, glaucoma and other diseases.

[0004] If the existing touch LCD screen is directly applied to educational exchange teaching, it will cause great harm to the human eyes.

[0005] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0006] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a blue light filter film and a display device to solve the problem in the prior art that the blue light generated by directly applying liquid crystal displays to educational exchange teaching is very harmful to the human eye.

[0007] The technical solution of the present invention is as follows:

[0008] A blue light filtering film comprises: a substrate layer;

[0009] A near-infrared light reflecting layer, wherein the near-infrared light reflecting layer is located on the light-emitting side of the substrate layer;

[0010] A blue light blocking layer is located on the light emitting side of the near infrared light reflecting layer.

[0011] Furthermore, the blue light filtering film further comprises:

[0012] A hard coating layer is disposed on the light incident surface of the substrate layer.

[0013] Furthermore, the blue light filtering film further comprises:

[0014] An adhesive layer, the adhesive layer being disposed on the light emitting surface of the blue light blocking layer;

[0015] A release layer is disposed on the light emitting surface of the adhesive layer in a removable manner.

[0016] Further, the blue light blocking layer includes: salicylate compounds and / or benzophenone compounds; or

[0017] The blue light blocking layer is a vapor-deposited deposit of Ti3O5 and SiO2.

[0018] Furthermore, the near-infrared light reflecting layer includes titanium dioxide.

[0019] Furthermore, the visible light reflectivity of the blue light filter film is: 12%-15%;

[0020] UV transmittance: 1.5%-1.7%.

[0021] Furthermore, the solar light absorption rate of the blue light filtering film is: 30%;

[0022] Solar reflectivity: 19%;

[0023] The sunlight transmittance is: 51%.

[0024] Based on the same concept, the present invention also includes a display device, including:

[0025] A backlight module, wherein the backlight module comprises a light source;

[0026] A display panel, the display panel is located on the light emitting side of the backlight module; and

[0027] The blue light filtering film as described above is located at the light emitting side of the display panel.

[0028] Furthermore, the main wavelength of the light emitted by the light source is 455nm-465nm.

[0029] Furthermore, the display device further includes:

[0030] A glass cover plate, the glass cover plate being located on a side of the blue light filtering film facing away from the light source;

[0031] An optical adhesive layer is located between the glass cover plate and the blue light filtering film, and connects the glass cover plate and the blue light filtering film.

[0032] Furthermore, the glass cover plate and the blue light filtering film are fully bonded together by the optical adhesive layer.

[0033] Beneficial effects of this solution: The present invention proposes a blue light filter film and display device, wherein the blue light filter film is set in an existing display device, so that the light emitted in the existing display device passes through the near-infrared light reflection layer, the near-infrared reflection layer is used to reflect near-infrared light, which can effectively reduce the absorption of heat by the substrate and has a heat insulation effect. After the light passes through the near-infrared light reflection layer, it reaches the blue light blocking layer, and the blue light blocking layer can block ultraviolet light and short-wavelength visible light, thereby reducing the energy of blue light, so that high-energy harmful blue light can be filtered out, reducing damage to the human eye. At the same time, the near-infrared reflection layer and the blue light blocking layer have different refractive indices. By utilizing the refractive index difference of the film material, the blue light can be effectively reduced and filtered, and the high-energy blue light entering the human eye can be further reduced to meet safety standards, thereby solving the problem in the prior art that the blue light generated by directly applying the liquid crystal display screen to educational exchange teaching has a greater harm to the human eye. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a left view of an embodiment of a blue light filtering film of the present invention;

[0035] Figure 2 is a cross-sectional view of an embodiment of a display device of the present invention;

[0036] Figure 3 The present invention is a cross-sectional view of an embodiment of a glass cover portion of a display device of the present invention.

[0037] The numbers in the figure are: 100, blue light filter film; 110, substrate layer; 120, near-infrared light reflection layer; 130, blue light blocking layer; 140, hard coating layer; 150, adhesive layer; 160, release layer; 200, backlight module; 300, display panel; 400, light source; 500, glass cover plate; 600, optical adhesive layer. DETAILED DESCRIPTION

[0038] The present invention provides a blue light filter film and a display device. To make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0039] like Figure 1 As shown, the present invention provides a blue light filtering film 100, comprising: a substrate layer 110, the substrate layer 110 is made of PET transparent material, a near-infrared light reflecting layer 120 is arranged on the light-emitting side of the substrate layer 110, the near-infrared light reflecting layer 120 is used to reflect near-infrared light in the light, and a blue light blocking layer 130 is arranged on the light-emitting side of the near-infrared light reflecting layer 120, the blue light blocking layer 130 is used to block ultraviolet light and short-wavelength visible light, thereby reducing blue light energy.

[0040] The blue light filter film 100 is set in an existing display device, so that the light emitted from the existing display device passes through the near-infrared light reflection layer 120. The near-infrared light reflection layer 120 is used to reflect near-infrared light, which can effectively reduce the absorption of heat by the substrate and has a heat insulation effect. After passing through the near-infrared light reflection layer 120, the light reaches the blue light blocking layer 130. The blue light blocking layer 130 can block ultraviolet light and short-wavelength visible light, thereby reducing the energy of blue light, so that high-energy harmful blue light can be filtered out, reducing damage to human eyes. At the same time, the near-infrared reflection layer and the blue light blocking layer 130 have different refractive indices. By utilizing the refractive index difference of the film material, the blue light can be effectively reduced and filtered, and the high-energy blue light entering the human eye can be further reduced to meet safety standards, thereby solving the problem that the blue light generated by directly applying the liquid crystal display screen to educational exchange teaching in the prior art has a greater harm to the human eye.

[0041] like Figure 1 As shown, in the specific structure of this embodiment: the blue light blocking layer 130 can be a UV blocking material, and the blue light blocking layer 130 specifically includes: a salicylate compound or a benzophenone compound or a mixture of a salicylate compound and a benzophenone compound. Alternatively, the blue light blocking layer 130 is a Ti3O5 and SiO2 vapor-deposited attachment.

[0042] Taking benzophenone compounds as an example, as UV blocking materials, benzophenone compounds have excellent high-efficiency anti-aging performance, can absorb 240-340 nanometer ultraviolet light, and have the characteristics of light color, non-toxicity, good compatibility, low migration, and easy processing. It has the greatest protective effect on polymers and helps to reduce color, while delaying yellowing and blocking physical property loss. It is widely used in PE, PVC, PP, PS, PC, plexiglass, polypropylene fiber and ethylene vinyl acetate. It also has good light stabilization effect on dry phenolic and alkyd varnishes, polyurethanes, acrylics, epoxies and other air-dried products.

[0043] Taking Ti3O5 and SiO2 vapor-deposited attachments as the blue light blocking layer 130 as an example, a high-refractive-index titanium pentoxide (Ti3O5) is used as a layer and a low-refractive-index silicon dioxide (SiO2) is used as a layer for stacking, and is attached to the near-infrared light reflecting layer 120 by vapor deposition, so that part of the high-energy blue light is filtered out, and it is not easy to produce light chromatic aberration. Ti3O5 has a higher refractive index, and its refractive index is 2.35 / 500nm; SiO2 has a lower refractive index, and its refractive index is 1.46 / 500nm. Through two layers of materials with different refractive indices, blue light can be filtered. At the same time, ultraviolet light and short-wavelength visible light can also be blocked.

[0044] The material of the near-infrared light reflecting layer 120 includes titanium dioxide. Nano-scale titanium dioxide has a small particle size and high transparency. It has a reflection intensity of 80-90% in the near-infrared region of 780-2500nm. The ability of the near-infrared light reflecting layer 120 to reflect light is improved. It can effectively reduce the absorption of heat by the substrate, reduce the surface temperature and conduction of the object, thereby achieving the purpose of reducing energy consumption and reducing emissions. The light first passes through the substrate layer 110 and then enters the near-infrared light reflecting layer 120, and enters the blue light blocking layer 130 from the light-emitting surface of the near-infrared reflecting layer. The near-infrared reflecting layer and the blue light blocking layer 130 have different refractive indices. By utilizing the difference in the refractive index of the film material, the blue light can be effectively reduced and filtered, and the high-energy blue light entering the human eye can be reduced.

[0045] like Figure 1 As shown, the blue light filter film 100 in this embodiment further includes: a hard coating layer 140, and the hard coating layer 140 is disposed on the light incident surface of the substrate layer 110. The hard coating layer 140 is a mixed layer of silicon material and resin. The hard coating layer 140 makes the entire blue light filter film 100 have a certain hardness, so that the blue light filter film 100 has the characteristics of a tempered film. When the blue light filter film 100 is attached to the glass cover plate 500 for use, the glass can be made explosion-proof without tempering.

[0046] An adhesive layer 150 is provided on the light-emitting surface of the blue light blocking layer 130, and the adhesive layer 150 is used to facilitate the attachment of the blue light filtering film 100 to the glass surface that needs to filter blue light. The adhesive layer 150 adopts OCA optical glue, and OCA (Optically Clear Adhesive) is a special adhesive used to bond transparent optical elements (such as lenses, etc.). It has the characteristics of being colorless and transparent, having a light transmittance of more than 90%, having good bonding strength, being able to be cured at room temperature or medium temperature, and having small curing shrinkage. The double-sided adhesive facilitates the attachment of the blue light filtering film 100 to the surface of components such as glass that need to filter blue light. A release layer 160 is provided on the light-emitting surface of the adhesive layer 150, and the release layer 160 can be peeled off and is disposed on the surface of the adhesive layer 150. The release layer 160 is used to protect the adhesive surface of the blue light filtering film 100. When the blue light filtering film 100 needs to be used, the release layer 160 is torn off from the adhesive surface, and the blue light filtering film 100 is fixed on the light-emitting surface of the component that needs to filter blue light through the adhesive layer 150. The release layer 160 in this embodiment is made of PET and the surface of the PET material is coated with fluorine. In this way, the release layer 160 is easy to tear off from the adhesive surface.

[0047] In this embodiment, a multilayer structure is used, and the multilayer structure is set in such a way that the difference in the refractive index of the materials in different layers will reduce the energy of the blue light emitted, thereby also helping to reduce the blue light energy from high energy to harmless low-energy blue light. For example, when the blue light blocking layer 130 is made of Ti3O5 and SiO2 vapor-deposited attachments, and the near-infrared light reflecting layer 120 is made of a titanium dioxide layer. Then the number of layers on the substrate layer 110 is titanium dioxide layer, Ti3O5 layer, SiO2 layer, and adhesive layer in sequence. In this way, the titanium dioxide layer has a low refractive index, the Ti3O5 layer has a high refractive index, the SiO2 layer has a low refractive index, and the adhesive layer has a high refractive index. The light passes through the low refractive index, high refractive index, low refractive index, and high refractive index in sequence and then emits. Through the change of high and low refractive indices, the overall blue light is filtered and the harmful blue light energy is attenuated.

[0048] The blue light filter film 100 in this solution has a visible light transmittance of 68%-78%; a visible light reflectance of 12%-15%; a UV transmittance of 1.5%-1.7%; a solar light absorptivity of 25%-35%; a solar light reflectivity of 14%-24%; and a solar light transmittance of 46%-56%. The blue light filter film has a visible light reflectance of 12%-15% and a UV transmittance of 1.5%-1.7%, and has excellent filtering performance for high-energy blue light. The specific parameters of the blue light filter film 100 in this embodiment are: visible light transmittance of 73%; visible light reflectance of 13%; UV transmittance of 1.6%; solar light absorptivity of 30%; solar light reflectance of 19%; and solar light transmittance of 51%. The blue light filter film 100 has excellent blue light reduction energy, so that high-energy harmful blue light can be filtered out to reduce the damage to human eyes.

[0049] like Figure 2As shown, based on the same concept, the present invention also proposes a display device, comprising: a backlight module 200 (BLU), a display panel 300 (OC), and the above-mentioned blue light filter film 100 (film). The backlight module 200 includes a light source 400, the light source 400 is an LED light source 400, the display panel 300 is a liquid crystal display panel 300, and the display panel 300 is located on the light-emitting side of the backlight module 200; the blue light filter film 100 is located on the light-emitting side of the display panel 300. By adding the above-mentioned blue light filter film 100 to the display device, the blue light filter film 100 allows the light emitted from the existing display device to pass through the near-infrared light reflection layer 120. The near-infrared light reflection layer 120 is used to reflect near-infrared light, which can effectively reduce the absorption of heat by the substrate and has a heat insulation effect. After passing through the near-infrared light reflection layer 120, the light reaches the blue light blocking layer 130. The blue light blocking layer 130 can block ultraviolet light and short-wavelength visible light, thereby reducing the energy of blue light. In this way, high-energy harmful blue light can be filtered out to reduce damage to human eyes.

[0050] The main wavelength of the light emitted by the light source 400 in this solution is 455nm-465nm. Specifically, the LED backlight source 400 uses a long-wave chip solution to shift the wavelength of the light source 400 from the high-energy blue light range (415-455nm, excluding 455nm) to the non-high-energy blue light range (around 460nm), thereby changing the wavelength of the blue light emitted from the light source 400. The wavelength of the emitted blue light is within the relatively harmless blue light range of around 460nm, which further reduces the damage to the eyes when the eyes are looking at the display device. The main wavelength of the light emitted by the light source 400 in this embodiment is 460nm, so the blue light generated has low energy and minimal damage to the eyes.

[0051] like Figure 2 , Figure 3 As shown, the display device further includes: a glass cover plate 500, and the glass cover plate 500 is located on the side of the blue light filter film 100 facing away from the light source 400; in this way, the blue light filter film 100 is located on the inner surface of the glass cover plate 500, and the glass cover plate 500 protects the display panel 300 of the display device on the outer side of the display panel 300. The added blue light filter film 100 is closely attached to the light incident surface of the glass cover plate. In addition to filtering blue light, it can also increase the strength of the glass cover plate 500, so that the glass cover plate 500 does not need to be tempered to achieve an explosion-proof effect. There is no need to attach a tempered film on the light emitting surface of the glass cover plate 500.

[0052] An optical adhesive layer 600 is disposed between the glass cover plate 500 and the blue light filter film 100, and the optical adhesive layer 600 connects the glass cover plate 500 and the blue light filter film 100. The optical adhesive layer 600 uses OCA optical adhesive. The blue light filter film 100 and the glass cover plate 500 can be firmly fixed by the optical adhesive layer 600, and the blue light blocking layer 130 is disposed toward the glass cover plate 500.

[0053] In this solution, the glass cover plate 500 and the blue light filter film 100 are fully bonded through the optical adhesive layer 600, and the full bonding process allows the glass cover plate 500 and the blue light filter film 100 to form a composite glass cover plate. In this way, the fixing is firm and not easy to loosen, the display panel 300 and the glass cover plate 500 are seamlessly bonded, and the blue light filter film 100 is fixed, so that the screen is light and thin, dust-proof, highly transparent, and drop-resistant.

[0054] In the above display device, a fully laminated composite CG (composite material glass cover plate 500) with a blue light filter film 100 is used to filter and suppress the overall blue light or attenuate its harmful blue light energy, so as to achieve a truly healthy eye protection high-quality display screen without sacrificing color temperature and visual effects. In combination with an LED long-wave blue light chip, the effect of directly reducing the blue light energy can be achieved. In addition, the main wavelength of the long-wave blue light chip is moved from 450 to about 460nm, so that the light source 400 does not generate high-energy blue light as much as possible, and a truly healthy eye protection interactive large screen can be achieved.

[0055] In summary, the present invention proposes a blue light filter film and a display device, wherein the blue light filter film 100 is set in an existing display device, so that the light emitted in the existing display device passes through the near-infrared light reflection layer 120, and the near-infrared reflection layer is used to reflect near-infrared light, which can effectively reduce the absorption of heat by the substrate and has a heat insulation effect. After the light passes through the near-infrared light reflection layer 120, it reaches the blue light blocking layer 130, and the blue light blocking layer 130 can block ultraviolet light and short-wavelength visible light, thereby reducing the energy of blue light, so that high-energy harmful blue light can be filtered out, reducing damage to human eyes. At the same time, the near-infrared reflection layer and the blue light blocking layer 130 have different refractive indices. By utilizing the refractive index difference of the film material, the blue light can be effectively reduced and filtered, and the high-energy blue light entering the human eye can be further reduced to meet the safety standard, thereby solving the problem in the prior art that the blue light generated by directly applying the liquid crystal display screen to educational exchange teaching has a greater harm to the human eye.

[0056] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A blue light filtering film, characterized in that: include: substrate layer; A near-infrared light reflecting layer, the near-infrared light reflecting layer is located on the light-emitting side of the substrate layer, and the near-infrared light reflecting layer is used to reflect near-infrared light in the light; A blue light blocking layer, the blue light blocking layer is located on the light-emitting side of the near-infrared light reflecting layer, and the blue light blocking layer is used to block ultraviolet light and short-wavelength visible light, wherein the short-wavelength visible light includes blue light; Meanwhile, the near-infrared reflection layer and the blue light blocking layer have different refractive indices, and the difference in refractive index between the near-infrared reflection layer and the blue light blocking layer is utilized to filter blue light; Wherein, the blue light blocking layer is Ti3O5 and SiO2 vapor-deposited deposits, and the near-infrared light reflecting layer includes titanium dioxide.

2. The blue light filter film according to claim 1, characterized in that: The blue light filtering film further comprises: A hard coating layer is disposed on the light incident surface of the substrate layer.

3. The blue light filter film according to claim 2, characterized in that: The blue light filtering film further comprises: An adhesive layer, the adhesive layer being disposed on the light emitting surface of the blue light blocking layer; A release layer is disposed on the light emitting surface of the adhesive layer in a removable manner.

4. The blue light filter film according to claim 1, characterized in that: The visible light reflectivity of the blue light filtering film is 12%-15%; the ultraviolet light transmittance is 1.5%-1.7%.

5. A display device, characterized in that: include: A backlight module, wherein the backlight module comprises a light source; A display panel, the display panel is located on the light-emitting side of the backlight module; as well as The blue light filter film as described in any one of claims 1 to 4, wherein the blue light filter film is located on the light output side of the display panel.

6. The display device according to claim 5, characterized in that The main wavelength of the light emitted by the light source is 455nm-465nm.

7. The display device according to claim 5, characterized in that The display device further includes: A glass cover plate, the glass cover plate being located on a side of the blue light filter film facing away from the light source; An optical adhesive layer is located between the glass cover plate and the blue light filtering film, and connects the glass cover plate and the blue light filtering film.

8. The display device according to claim 7, characterized in that The glass cover plate and the blue light filtering film are fully bonded together by the optical adhesive layer.

Images