Display component and display comprising same

Abstract

The present invention provides a display member and a display comprising the same, the display member comprising a liquid crystal display screen, a heat insulating layer, and glass, the heat insulating layer being a laminated film obtained by laminating 50 or more resin layers, the thickness of each resin layer being 1-200 nm. In the field of outdoor display, reflection and blocking of ultraviolet rays and infrared rays can be achieved through the display component, the effect of high visible light transmittance is achieved, and meanwhile the risk of yellowing is reduced.

Description

Technical Field

[0001] The present invention relates to a display component, and in particular to a display component having excellent heat insulation and visible light transmittance and solving problems such as yellowing and screen blackening, and a display comprising the same. Background Art

[0002] In the field of outdoor display, the use of electronic display screens is becoming more and more extensive, mainly used for advertising display, road sign guidance, current affairs propaganda, charging pile display, bus station information display and other scenes. Due to the influence of the working environment, the service life of electronic display screens currently used outdoors is generally short in high temperature and high humidity environments, and the screen is prone to black screen due to heat. Therefore, for the outdoor display field, a heat insulation film with excellent performance is needed to solve the above problems.

[0003] For this purpose, there is a known technique of treating a resin film to improve its heat absorption, for example, a technique of treating a resin film to reflect infrared rays.

[0004] Patent document 1 (CN217306072U) discloses an outdoor display screen, which is provided with a heat-insulating film between the touch screen and the liquid crystal screen. The heat-insulating film can play a role in heat insulation, avoid the problem of excessive heating of the outdoor display screen due to direct sunlight, keep the working temperature of the outdoor display screen within a normal range, and extend the service life of the outdoor display screen. However, the heat-insulating film used in the outdoor display screen is a sticky green transparent infrared absorption film, which cannot clearly restore the original color effect of the electronic display screen.

[0005] In addition, as the display screen that achieves heat insulation by adding infrared absorbers increases in usage time, the film will turn yellow, the temperature of the glass itself will increase, and the heat insulation effect will not be achieved. Summary of the invention

[0006] In order to solve the above problems, the present invention provides a display component, which can realize the reflection and blocking of ultraviolet rays and infrared rays, achieve the effect of high visible light transmittance, and reduce the risk of yellowing.

[0007] The present invention provides a display component, which comprises a liquid crystal display screen, a heat insulating layer and glass, wherein the heat insulating layer is a laminated film formed by laminating more than 50 resin layers.

[0008] <Glass>

[0009] The glass included in the display component of the present invention is not particularly limited as long as it can be used for display. For example, it can be inorganic glass or organic glass. The organic glass refers to organic glass with a curved or flat surface formed by extrusion or injection molding of a resin, and the resin can be polycarbonate, polymethyl methacrylate, polysulfone, acrylonitrile-butadiene-styrene copolymer, polypropylene, polyethylene, polyvinyl chloride, polystyrene, etc. The thickness of the glass can be selected according to actual needs, for example, it can be 3mm to 12mm.

[0010] <Thermal insulation layer>

[0011] The heat-insulating layer of the present invention is a laminated film formed by laminating more than 50 resin layers. By providing the heat-insulating layer, the reflection of infrared wavelength light can be improved, and the transmittance of visible light can be improved, thereby reducing the total solar transmittance, achieving excellent optical transmittance effect of the display component, and making the display component have excellent heat-insulating effect, extending the service life of the display component. Furthermore, the heat-insulating layer of the display component of the present invention achieves heat-insulating effect by reflecting infrared wavelength light, and absorbs less infrared light, so the risk of yellowing caused by infrared light can be suppressed.

[0012] From the viewpoint of heat insulation effect, the heat insulation layer preferably has 100 or more resin layers, more preferably 900 or more resin layers. On the other hand, from the viewpoint of film forming properties, the heat insulation layer preferably has 1500 or less resin layers.

[0013] In addition, from the viewpoint of improving the infrared light reflectivity, the heat insulating layer is preferably formed by alternately stacking two or more resin layers with different refractive indices. For the resin layers with different refractive indices, from the viewpoint of improving the infrared light reflectivity, the difference in refractive index is preferably 0.12 or more, more preferably 0.14 or more, and particularly preferably 0.16 or more. In addition, from the viewpoint of improving interlayer delamination, the difference in refractive index is preferably 0.35 or less, and more preferably 0.23 or less.

[0014] Regarding the resin layers laminated in the heat-insulating layer, it is preferred that the thickness of each layer is different from the aspect of the reflection band. For example, the thickness of each layer may be 1 nm to 200 nm.

[0015] As the resin in the resin layer, for example, polyester resin, polycarbonate resin, polyphenylene sulfide resin, polyethylene resin, polypropylene resin, etc. can be cited. From the perspective of strength, heat resistance, transparency and versatility, polyester resin is preferred, for example, polyester obtained by polymerizing monomers with dibasic acids such as aromatic dicarboxylic acids or aliphatic dicarboxylic acids and diols as main components. The aromatic dicarboxylic acids can be terephthalic acid, isophthalic acid, phthalic acid, 1,4-naphthalene dicarboxylic acid, 1,5-naphthalene dicarboxylic acid, 2,6-naphthalene dicarboxylic acid, etc. The aliphatic dicarboxylic acids can be adipic acid, suberic acid, sebacic acid, etc. The diols can be ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, neopentyl glycol, etc.

[0016] In addition, from the perspective of heat insulation effect, it is preferred that the average transmittance and reflectance of the heat insulation layer satisfy the following conditions:

[0017] The average transmittance of visible light 400-800nm ​​is ≥ 90% (Formula 1);

[0018] The average reflectivity of infrared light 800~1300nm is ≧80% (Formula 2).

[0019] The heat-insulating layer may be produced, for example, by co-extruding a resin material and then biaxially stretching it.

[0020] <LCD Monitor>

[0021] The display member of the present invention may also include a liquid crystal display screen. As the liquid crystal display screen, for example, an ink screen, an OLED display, an LCD display, etc. may be used.

[0022] <Optical adhesive layer>

[0023] The display component of the present invention may further include an optical adhesive layer, through which the glass and the heat insulation layer are connected. The optical adhesive layer may be formed of at least one selected from acrylic adhesive, silica gel, polyvinyl butyral, ethylene-vinyl acetate copolymer, and the like.

[0024] The optical adhesive layer adopts different processes according to different materials. Generally, it can be carried out by a single-layer lamination process or a double-layer lamination process. The single-layer lamination can be performed by bonding the heat insulation layer and the glass through acrylic glue or silicone. In the double-layer lamination process, the optical adhesive layer can be bonded to the glass and the heat insulation layer using polyvinyl butyral (PVB) and ethylene-vinyl acetate copolymer (EVA). Considering the ultraviolet blocking rate, it is preferred that the optical adhesive layer contains an ultraviolet absorber.

[0025] <Display component>

[0026] The display component of the present invention comprises glass, a heat insulating layer and a liquid crystal display screen. The display component can be arranged in a structure of glass / heat insulating layer / liquid crystal display screen, heat insulating layer / glass / liquid crystal display screen, or a structure of glass / heat insulating layer / glass / liquid crystal display screen.

[0027] The display component has a blocking rate of 99% or more for ultraviolet rays with a wavelength of 315nm to 400nm.

[0028] <LCD Display>

[0029] The present invention also provides a liquid crystal display comprising the above display component.

[0030] <Purpose>

[0031] The present invention can be applied to outdoor advertising machines and the like, thereby extending the heat insulation effect of the product, clearly restoring the original color effect of the electronic display screen, and reducing the risk of yellowing. DETAILED DESCRIPTION

[0032] The present invention is described in more detail by the following examples, but the examples are not intended to limit the present invention.

[0033] The test methods used in the Examples and Comparative Examples are as follows. For all tests, if the test temperature is not clearly stated, the test is performed at 23±2°C.

[0034] <Total solar transmittance Tts>

[0035] For the display components obtained in the embodiments and comparative examples, the spectral transmittance and reflectance values ​​were measured in the wavelength range of 300 to 2500 nm using a JASCO V-670 spectrophotometer, and the values ​​were calculated according to the calculation method specified in GBT 5137.4-2020. The total solar transmittance is a parameter that reflects the thermal insulation effect. The smaller the total solar transmittance Tts value, the better the thermal insulation effect.

[0036] <Infrared light reflectivity>

[0037] For the thermal insulation films used in the examples and comparative examples, the spectral reflectance values ​​were measured in the wavelength range of 780 to 1500 nm using a JASCO V-670 spectrophotometer. Then, the measured spectral reflectance values ​​and the coefficients corresponding to the wavelengths were multiplied and added at intervals of 1 nm in the wavelength range of 800 to 1300 nm. The coefficients corresponding to the wavelengths and the calculation method refer to the Japanese standard JIS Z8701.

[0038] <Visible light transmittance Tvis>

[0039] For the thermal insulation films and display components used and obtained in the embodiments and comparative examples, the spectral transmittance values ​​were measured in the wavelength range of 400 to 800 nm using a JASCO V-670 spectrophotometer. Then, the measured spectral transmittance values ​​and the coefficients corresponding to the wavelengths were multiplied and added at intervals of 1 nm in the wavelength range of 380 to 780 nm. The coefficients corresponding to the wavelengths and the calculation method refer to the Japanese standard JIS Z8701.

[0040] <Ultraviolet transmittance UVA>

[0041] For the display components obtained in the embodiments and comparative examples, the spectral transmittance values ​​were measured in the wavelength range of 315 to 400 nm using a JASCO V-670 spectrophotometer. Then, the measured transmittance spectrum values ​​and the coefficients corresponding to the wavelengths were multiplied and added at intervals of 1 nm in the wavelength range of 315 to 400 nm. The coefficients corresponding to the wavelengths and the calculation method refer to the Japanese standard JIS Z8701.

[0042] <Yellowing Intensity ΔYI>

[0043] For the thermal insulation films used in the examples and comparative examples, the yellowness index YI of the other side of the glass opposite to the irradiated side before and after the xenon lamp aging test was measured using a Shiro M311ME-7700N colorimeter under the following test conditions, and the yellowing degree ΔYI before and after irradiation was calculated.

[0044] Xenon lamp irradiation intensity 60W / m 2 @300~400nm

[0045] Blackboard temperature 63±3℃

[0046] Spraying frequency: 18min / 120min

[0047] Spray pressure: 0.8-1.2kg / cm 2

[0048] Radiation dose: 350MJ / m 2

[0049] Test time: 1000Hr

[0050] The raw materials used in the embodiments and comparative examples are as follows:

[0051] <Glass>

[0052] The inorganic glass material is tempered glass produced by Jiangyin Bojing Glass Co., Ltd., and the glass thickness is 6mm.

[0053] The plexiglass material is a transparent PC sheet produced by Wuxi Desheng Acrylic Sheet Co., Ltd., and the thickness of the plexiglass is 6mm.

[0054] <Thermal insulation layer>

[0055] Multi-layer film-1: PICASUS, refractive index difference 0.21, number of layers 1000, produced by Toray Industries, Ltd.

[0056] Multi-layer film-2: PICASUS, refractive index difference 0.12, number of layers 1000, produced by Toray Industries, Ltd.

[0057] Multi-layer film-3: PICASUS, refractive index difference 0.35, number of layers 1000, produced by Toray Industries, Ltd.

[0058] Multi-layer film-4: PICASUS, refractive index difference 0.21, number of layers 100, produced by Toray Industries, Ltd.

[0059] <Infrared Absorption Film>

[0060] Changzhou Mountain is made of Dishan protective material, model titanium 70

[0061] <Optical adhesive layer>

[0062] Transparent acrylic adhesive, produced by Suzhou Fanak Optoelectronics Co., Ltd.

[0063] Polyvinyl butyral, produced by Sekisui Chemical Co., Ltd.

[0064] Ethylene-vinyl acetate copolymer, produced by Dow Chemical Co.

[0065] <Display>

[0066] Liquid crystal display, produced by BOE Technology Group Co., Ltd.

[0067] The sample compositions of the embodiments and comparative examples are shown in Table 1.

[0068] Example 1

[0069] According to the materials shown in Table 1, the heat insulation layer and the glass are bonded with acrylic by a bonding machine at room temperature, and then degassing is performed for 30 minutes at 60 degrees and 0.5 MPa pressure to rapidly solidify the adhesive layer and then assemble the liquid crystal display screen to obtain a display component. The structure of the display component is glass / optical adhesive layer / heat insulation layer / display screen.

[0070] Embodiments 2 to 5 and 8

[0071] The same operation as in Example 1 was carried out except that the materials used were changed as shown in Table 1 to obtain a display member.

[0072] Example 6

[0073] According to the materials shown in Table 1, two layers of glass are laminated by a laminating machine at a high temperature of 120 degrees through an EVA heat insulation layer, and then a liquid crystal display screen is assembled after cooling to room temperature to obtain a display component. The structure of the display component is glass / optical adhesive layer / heat insulation layer / optical adhesive layer / glass / display screen.

[0074] Example 7

[0075] According to the materials shown in Table 1, two layers of glass are laminated by a laminating machine at a high temperature of 180 degrees through a PVB heat insulation layer, and then a liquid crystal display screen is assembled after cooling to room temperature to obtain a display component. The structure of the display component is glass / optical adhesive layer / heat insulation layer / optical adhesive layer / glass / display screen.

[0076] Comparative Examples 1 and 2

[0077] The same operation as in Example 1 was carried out except that the materials used were changed as shown in Table 1 to obtain a display member.

[0078] Comparative Example 3

[0079] The same operation as in Example 7 was carried out except that the materials used were changed as shown in Table 1 to obtain a display member.

[0080] The test results of Examples 1 to 8 and Comparative Examples 1 to 3 are shown in Table 1.

[0081] Table 1

[0082]

[0083] By comparing Examples 1 to 8 with Comparative Examples 1 to 3, it can be seen that the multi-layer film has a very significant infrared light reflection effect compared with the infrared heat-absorbing film, and can reduce the risk of yellowing while maintaining high visible light transmittance while providing heat insulation.

[0084] It can be seen from the comparison of Examples 1 to 3 that the heat insulation effect and yellowing risk of the film itself and the display component can be affected by adjusting the difference in refractive index between the resin layers of the multi-layer film.

[0085] By comparing Examples 1, 4, and 5, it can be seen that by adjusting the number of stacked layers of the multi-layer film, the heat insulation effect and yellowing risk of the film and display components can be affected.

Claims

1. A display component, characterized in that: The invention comprises a liquid crystal display screen, a heat insulating layer and glass, wherein the heat insulating layer is a laminated film formed by laminating more than 50 resin layers.

2. The display component according to claim 1, characterized in that: The thermal insulation layer satisfies the following formula 1 and formula 2: The average transmittance of visible light 400-800nm ​​is ≥ 90% (Formula 1); The average reflectivity of infrared light 800~1300nm is ≧80% (Formula 2).

3. The display component according to claim 1, characterized in that: The transmittance of the display member to ultraviolet rays with a wavelength of 315 nm to 400 nm is 1% or less.

4. The display component according to claim 1, characterized in that: The resin layer is composed of two or more resin layers having different refractive indices.

5. The display component according to claim 1, characterized in that: The heat insulating layer is formed by laminating more than 100 resin layers.

6. The display component according to claim 1, characterized in that: The resin of the resin layer is polyester resin.

7. The display component according to claim 1, characterized in that: An optical adhesive layer is provided between the heat insulation layer and the glass, and the optical adhesive layer is formed by at least one selected from acrylic adhesive, silica gel, polyvinyl butyral, and ethylene-vinyl acetate copolymer.

8. The display component according to claim 7, characterized in that: The optical adhesive layer contains a UV absorber.

9. A display, characterized in that: A display member comprising the display member as claimed in any one of claims 1 to 8.

Images