Display device

Abstract

The invention relates to a display device. The display device comprises a display panel, a first polaroid, a second polaroid and a backlight module. The first polaroid is arranged on the light emitting side of the display panel; the second polaroid is arranged on one side, far away from the first polaroid, of the display panel; the backlight module is arranged on the side, away from the display panel, of the second polaroid. Wherein the material of the second polaroid comprises an infrared ray absorber. According to the display device, the infrared ray absorber is added into the material of the second polaroid, the infrared ray absorber can absorb the infrared rays emitted by the backlight module, the infrared rays emitted by the backlight module are prevented from entering the display panel, the problem that the material in the display panel is aged due to the infrared rays is solved, and the display effect is improved. Therefore, the service life of the display panel is prolonged.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display device. Background Art

[0002] In the electromagnetic spectrum, the radiation that is outside the red light and has a lower frequency than visible light and a higher frequency than microwaves is called infrared. Infrared is invisible to the naked eye and belongs to invisible light. Infrared, also known as infrared thermal radiation, has a strong thermal effect. It can resonate with most inorganic molecules and organic macromolecules in organisms, causing these molecules to move faster and rub against each other, thereby generating heat.

[0003] In the backlight of a liquid crystal display (LCD), the commonly used backlight is composed of a blue light-emitting diode (LED) and a color conversion material, and the color conversion material includes materials such as yellow phosphor, red phosphor, and red and green quantum dots. The blue light emitted by the LED excites the color conversion material, emitting light of other colors, which are mixed into white light. Due to the presence of lattice defects (inorganic color conversion materials) or vibration energy levels (organic color conversion materials) in the color conversion material, long-wavelength, low-energy infrared light is emitted during the color conversion process. Because infrared light is not within the range of human eye observation, it will not affect the color performance of the display, so it is often ignored. However, when the display is lit for a long time, the infrared light emitted by the backlight continues to heat the display, causing the temperature of the display to rise. The temperature rise will have a harmful effect on the materials in the display, such as liquid crystal, color resistance, frame glue, etc., accelerate material aging, and affect the life of the display. Summary of the invention

[0004] The embodiments of the present application provide a display device, which can reduce the influence of infrared rays in backlight on a display panel, thereby increasing the life of the display panel.

[0005] In order to achieve the above object, the present application provides a display device, including:

[0006] Display panel;

[0007] A first polarizer, arranged on the light-emitting side of the display panel;

[0008] A second polarizer is disposed on a side of the display panel away from the first polarizer; and

[0009] A backlight module, arranged on a side of the second polarizer away from the display panel;

[0010] Wherein, the material of the second polarizer contains an infrared absorber.

[0011] In some embodiments, the second polarizer includes a substrate layer, a polarizing layer, a compensation layer, and a bonding layer stacked in sequence, and the bonding layer is arranged close to the display panel; wherein the material of at least one film layer among the substrate layer, the polarizing layer, the compensation layer, and the bonding layer contains the infrared absorber.

[0012] In some embodiments, the light with a wavelength of 800nm ​​to 1100nm emitted by the backlight module is converted into light with a wavelength of 400nm to 700nm after passing through the second polarizer.

[0013] In some embodiments, the infrared absorber comprises an upconversion material.

[0014] In some embodiments, the up-conversion material includes at least one of an up-conversion organic light-emitting material based on triplet-triplet annihilation and a host material doped with rare earth ions.

[0015] In some embodiments, the up-conversion organic light-emitting material includes at least one of ruthenium bipyridine, 9,10-diphenylanthracene, tetraphenylbenzoporphyrin platinum, and perylene.

[0016] In some embodiments, the matrix material doped with rare earth ions includes a matrix material and rare earth ions doped in the matrix material, the matrix material includes at least one of a halide, an oxide, an oxyhalide, and a sulfur-containing compound, and the rare earth ions include Er 3+ 、Tm 3+ 、Dy 3+ , Tb 3+ 、Ho 3+ and Eu 3+ At least one of .

[0017] In some embodiments, in the film layer comprising the infrared absorber, the mass of the infrared absorber accounts for 1% to 5% of the total mass of the material of the film layer.

[0018] In some embodiments, the transmittance of the second polarizer to light in the wavelength range of 800nm ​​to 1100nm is 0% to 40%.

[0019] In some embodiments, the transmittance of the second polarizer to light in the wavelength range of 400nm to 650nm is 80% to 100%.

[0020] The present application provides a display device. Without changing the structure of the existing display device, the present application adds an infrared absorber to the film material of the second polarizer located between the backlight module and the display panel. The infrared absorber is used to absorb the light in the near-infrared band emitted by the backlight module, thereby reducing the infrared rays emitted by the backlight module from entering the display panel, improving the problem of material aging in the display panel caused by infrared rays, and thus prolonging the life of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of a display device provided in an embodiment of the present application;

[0022] Figure 2 is a schematic structural diagram of a second polarizer provided in an embodiment of the present application;

[0023] Figure 3 is a schematic structural diagram of another second polarizer provided in an embodiment of the present application;

[0024] Figure 4 This is a wavelength conversion schematic diagram of an up-conversion material provided in an embodiment of the present application.

[0025] Description of reference numerals:

[0026] 10. Display device; 100. Display panel; 110. First substrate; 120. Second substrate; 130. Liquid crystal layer; 140. Frame glue; 200. First polarizer; 300. Second polarizer; 310. Protective film; 320. Base material layer; 321. First base material layer; 322. Second base material layer; 330. Polarizing layer; 340. Compensation layer; 350. Adhesive layer; 351. First adhesive layer; 352. Second adhesive layer; 360. Release film; 400. Backlight module; 410. Back panel; 420. Light source; 421. LED; 430. Color conversion layer. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0028] See also Figure 1 , Figure 1: is a structural schematic diagram of a display device 10 provided in an embodiment of the present application. The present application provides a display device 10, the display device 10 comprising a display panel 100, a first polarizer 200, a second polarizer 300 and a backlight module 400. The first polarizer 200 is arranged on the light-emitting side of the display panel 100; the second polarizer 300 is arranged on the side of the display panel 100 away from the first polarizer 200; the backlight module 400 is arranged on the side of the second polarizer 300 away from the display panel 100; wherein the material of the second polarizer 300 contains an infrared absorber.

[0029] The display panel 100 may be a liquid crystal display panel 100, comprising a first substrate 110 and a second substrate 120 arranged opposite to each other, and a liquid crystal layer 130 located between the first substrate 110 and the second substrate 120. The first substrate 110 may be an array substrate, comprising a first substrate and a driving circuit layer located on the first substrate, the first substrate may be a flexible substrate or a rigid substrate, and the driving circuit layer includes a thin film transistor array; the second substrate 120 may be a color film substrate, comprising a second substrate and a color resist layer located on the second substrate, the second substrate may be a flexible substrate or a rigid substrate, and the color resist layer includes at least one of red color resist, green color resist and blue color resist. The display panel 100 further comprises a sealant 140, the sealant 140 is located between the first substrate 110 and the second substrate 120 and is arranged around the liquid crystal layer 130.

[0030] The first polarizer 200 is located on the light-emitting side of the display panel 100, that is, the side of the second substrate 120 away from the first substrate 110. The second polarizer 300 is located on the light-incident side of the display panel 100, that is, the side of the first substrate 110 away from the second substrate 120. The second polarizer 300 is used to polarize the light emitted by the backlight module 400, and the first polarizer 200 is used to adjust the angle of polarized light to achieve picture display. In the present application, the film material of the second polarizer 300 includes an infrared absorber, which can absorb infrared rays or convert infrared rays into visible light.

[0031] The backlight module 400 is arranged on the light incident side of the display panel 100 to provide a light source for the display panel 100. The backlight module 400 includes a backplane 410, a light source 420, and a color conversion layer 430, etc., wherein the light source 420 is located on the backplane 410, and includes LEDs 421 arranged in an array, and the LEDs 421 can also be replaced by Mini-LEDs or Micro-LEDs; the color conversion layer 430 is located on the side of the light source 420 close to the second polarizer 300, and the color conversion layer 430 is located above the light source 420 to convert the light emitted by the light source 420 into light of other colors as required, for example, the light source 420 can be a blue LED, and the blue light can be converted into red light or green light for emission through the color conversion layer 430 above it.

[0032] Since the color conversion material used in the color conversion layer 430 has lattice defects (such as inorganic color conversion materials) or vibration energy levels (such as organic color conversion materials), long-wavelength, low-energy infrared rays are emitted during the color conversion process. However, the heat generated by the infrared rays will cause the temperature of the display panel 100 to rise, resulting in aging of materials such as liquid crystal, color resistance, and frame glue in the display panel 100, affecting the life of the display panel 100. Therefore, the present application adds an infrared absorber to the film material of the second polarizer 300. Since the second polarizer 300 is located between the backlight module 400 and the display panel 100, the light emitted by the backlight module 400 first passes through the second polarizer 300 and then enters the display panel 100. When the light emitted by the backlight module 400 passes through the second polarizer 300, the infrared absorber in the second polarizer 300 can absorb the light in the near-infrared band emitted by the backlight module 400, thereby reducing the infrared light emitted by the backlight module 400 entering the display panel 100, improving the problem of material aging in the display panel 100 caused by the heating due to infrared irradiation, thereby increasing the life of the display panel 100.

[0033] In some embodiments, please refer to Figure 2-Figure 3 The second polarizer 300 includes a substrate layer 320, a polarizing layer 330, a compensation layer 340 and a bonding layer 350 which are stacked in sequence, and the bonding layer 350 is disposed close to the display panel 100. The material of at least one film layer among the substrate layer 320, the polarizing layer 330, the compensation layer 340 and the bonding layer 350 contains the infrared absorber, that is, the infrared absorber can be added to any one film layer of the second polarizer 300, or any multiple film layers.

[0034] It should be noted that the second polarizer 300 may also include other conventional film layers in the art, which is not limited here.

[0035] In some embodiments, at least one of the substrate layer 320 and the bonding layer 350 of the second polarizer 300 contains the infrared absorber. The substrate layer 320 and the bonding layer 350 do not have optical functions, and when the infrared absorber is added to these two film layers, it will not affect the polarization function of the polarizing layer 330 and the compensation function of the compensation layer 340.

[0036] In one embodiment, please refer to Figure 2 , is a schematic structural diagram of a second polarizer 300 provided in an embodiment of the present application. The second polarizer 300 includes a protective film 310, a substrate layer 320, a polarizing layer 330, a compensation layer 340 and an adhesive layer 350 which are stacked in sequence. Among them, the material of at least one of the substrate layer 320, the polarizing layer 330, the compensation layer 340 and the adhesive layer 350 contains the infrared absorber. The polarizer may also include a release film 360 disposed on a side of the adhesive layer 350 away from the compensation layer 340, and the release film 360 is torn off before the second polarizer 300 is attached to the display panel 100, so that the adhesive layer 350 is attached to the light incident side surface of the display panel 100.

[0037] In one embodiment, please refer to Figure 3 , is a schematic structural diagram of another second polarizer 300 provided in an embodiment of the present application. The second polarizer 300 includes a protective film 310, a first substrate layer 321, a first adhesive layer 351, a second substrate layer 322, a polarizing layer 330, a compensation layer 340 and a second adhesive layer 352 which are stacked in sequence. Among them, the material of at least one of the first substrate layer 321, the first adhesive layer 351, the second substrate layer 322, the polarizing layer 330, the compensation layer 340 and the second adhesive layer 352 contains the infrared absorber. The polarizer also includes a release film 360 arranged on a side of the adhesive layer 350 away from the compensation layer 340, and the release film 360 is torn off before the second polarizer 300 is attached to the display panel 100, so that the adhesive layer 350 is attached to the light incident side surface of the display panel 100.

[0038] In the above embodiment, the materials of the substrate layer 320, the first substrate layer 321, and the second substrate layer 322 may be, but are not limited to, polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), polyurethane, etc. The materials of the adhesive layer 350, the first adhesive layer 351, and the second adhesive layer 352 may be, but are not limited to, pressure sensitive adhesive (PSA). The material of the polarizing layer 330 may be, but are not limited to, polyvinyl alcohol (PVA). The material of the compensation layer 340 may be, but are not limited to, triacetate film (TAC), phase difference film, etc.

[0039] In some embodiments, the infrared absorber may be an up-conversion material. The up-conversion material refers to a material that emits high-energy light when excited by low-energy light, that is, when excited by long-wavelength, low-frequency light, the material emits short-wavelength, high-frequency light. Therefore, the up-conversion material can convert infrared light into visible light.

[0040] like Figure 4 As shown, the wavelength of near-infrared light is greater than that of visible light. The near-infrared light with a long wavelength and a low frequency can emit visible light with a short wavelength and a high frequency after exciting the up-conversion material. In the present application, since the up-conversion material is added to the film material of the second polarizer 300, the second polarizer 300 of the present application can not only convert the light with disordered polarization direction into linear polarized light, but also has the function of absorbing near-infrared light, so as to reduce the infrared light emitted by the backlight module 400 from entering the display panel 100, thereby extending the life of the display panel 100; at the same time, the second polarizer 300 can also convert the near-infrared light emitted by the backlight module 400 into visible light, improve the light energy utilization rate of the backlight module 400, and achieve the purpose of energy saving and efficiency improvement.

[0041] Specifically, Figure 4 As shown, the second polarizer 300 can selectively convert the light with a wavelength of 800nm ​​to 1100nm in the light emitted by the backlight module 400 into light with one or more wavelengths in the wavelength range of 400nm to 700nm, that is, convert the near-infrared light in the light emitted by the backlight module 400 into at least one of red light, green light, blue light, etc. in the visible light. The converted visible light can be used as the light source of the display panel 100, which can further improve the light energy utilization rate of the backlight module 400.

[0042] In some embodiments, the transmittance of the second polarizer 300 to the light with a wavelength of 800nm ​​to 1100nm is 0% to 40%, while under the same polarizer structure, the transmittance of the ordinary polarizer without the infrared absorber to the light with a wavelength of 800nm ​​to 1100nm is greater than 75%. Therefore, the second polarizer 300 with the infrared absorber added in the present application can effectively reduce the infrared rays emitted by the backlight module 400 into the display panel 100, thereby effectively improving the service life of the display panel 100.

[0043] In some embodiments, the transmittance of the second polarizer 300 to light in the band of 400nm to 650nm is 80% to 100%. The second polarizer 300 of the present application has a high transmittance to light in the visible light band, which can improve the light energy utilization rate of the backlight module 400 and increase energy efficiency.

[0044] In some embodiments, the up-conversion material includes at least one of an up-conversion organic light-emitting material based on triplet-triplet annihilation and a host material doped with rare earth ions.

[0045] The up-conversion organic light-emitting material can absorb long-wavelength light and emit short-wavelength light through the triplet-triplet annihilation process, that is, absorb low-energy light and convert it into high-energy light to achieve up-conversion. The up-conversion organic light-emitting material includes at least one of bipyridine ruthenium, 9,10-diphenylanthracene, tetraphenylbenzoporphyrin platinum and perylene. The chemical structures of bipyridine ruthenium, 9,10-diphenylanthracene, tetraphenylbenzoporphyrin platinum and perylene are as follows:

[0046] The structural formula of ruthenium bipyridine is

[0047] The structural formula of 9,10-diphenylanthracene is

[0048] The structural formula of tetraphenylbenzoporphyrin platinum is

[0049] The structural formula of perylene is

[0050] Furthermore, the up-conversion organic light-emitting material includes a donor and an acceptor, the donor electrons transition to the acceptor energy level, two triplet states are interactively annihilated, and a new energy level is generated, thereby realizing the conversion of low-energy light into high-energy light.

[0051] In one embodiment, the up-conversion organic light-emitting material includes a combination of ruthenium bipyridine and 9,10-diphenylanthracene, wherein ruthenium bipyridine is a donor and 9,10-diphenylanthracene is an acceptor.

[0052] In one embodiment, the up-conversion organic light-emitting material includes a combination of tetraphenylbenzoporphyrin platinum and perylene, wherein the tetraphenylbenzoporphyrin platinum is a donor and the perylene is an acceptor.

[0053] The matrix material doped with rare earth ions can convert photoelectrons to a specific energy level after absorbing long-wavelength light due to its own complex energy level structure, and emit short-wavelength light to achieve up-conversion. The matrix material doped with rare earth ions includes a matrix material and rare earth ions doped in the matrix material, the matrix material includes at least one of halides, oxides, oxyhalides and sulfur-containing compounds, and the rare earth ions include Er 3+ 、Tm 3+ 、Dy 3 + , Tb 3+ 、Ho 3+ and Eu 3+ At least one of .

[0054] In some embodiments, any film layer in the second polarizer 300 may contain the infrared absorber. The infrared absorber may be mixed with the material of any film layer in the second polarizer 300 to form a film layer containing the infrared absorber. Among them, in the film layer containing the infrared absorber, the mass of the infrared absorber accounts for 1% to 5% of the total mass of the film layer material. Considering the overall light effect of the second polarizer 300 and the process cost, the content of the infrared absorber should not be too much or too little. When the content of the infrared absorber in the film layer containing the infrared absorber is within the above range, the second polarizer 300 has better infrared absorption and conversion efficiency.

[0055] In one embodiment, the substrate layer 320 contains the infrared absorber. Specifically, the material forming the substrate layer 320 includes a main material and an up-conversion material, and the mass of the up-conversion material accounts for 1% to 5% of the total mass of the material of the substrate layer 320. The main material of the substrate layer 320 is an organic polymer, such as PET, PMMA, polyurethane and other organic polymer materials.

[0056] In this embodiment, the method for preparing the substrate layer 320 including the up-conversion material includes:

[0057] Adding upconversion material powder to polymer particle material, stirring and mixing evenly to obtain a mixed material;

[0058] The mixed material is added into a film-forming system, and then formed into a film by extrusion and stretching to form a substrate layer 320 containing the up-conversion material.

[0059] Among them, the thickness of the extrusion and stretching film is 20um-80um.

[0060] In one embodiment, the bonding layer 350 contains the infrared absorber. Specifically, the material forming the bonding layer 350 includes a main material and an up-conversion material, and the mass of the up-conversion material accounts for 1% to 5% of the total mass of the material of the bonding layer 350. The bonding layer 350 can be a pressure-sensitive adhesive, and the main material of the bonding layer 350 is a resin, such as an acrylic resin.

[0061] In this embodiment, the preparation method of the bonding layer 350 including the up-conversion material includes:

[0062] The up-conversion material and the resin are mixed, and the solvent ethyl acetate is added, and the mixture is stirred thoroughly to form a mixed solution;

[0063] A heat curing additive is added to the mixed solution, mixed evenly and then coated into a film, and then heated to dry the solvent and further cross-link the resin to form a bonding layer 350 containing the up-conversion material.

[0064] The thickness of the coating film is 10um to 40um. The solid content of the mixed solution is 5% to 25%, preferably 15%.

[0065] In summary, the present application provides a display device. Without changing the structure of the existing display device, the present application adds an infrared absorber to the film material of the second polarizer located between the backlight module and the display panel. The infrared absorber is used to absorb the light in the near-infrared band emitted by the backlight module, thereby reducing the infrared rays emitted by the backlight module from entering the display panel, improving the problem of material aging in the display panel caused by infrared rays, and thus increasing the life of the display panel.

[0066] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0067] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0068] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0069] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A display device, characterized in that: include: Display panel; A first polarizer, arranged on the light-emitting side of the display panel; A second polarizer is arranged on a side of the display panel away from the first polarizer; as well as A backlight module, arranged on a side of the second polarizer away from the display panel; Wherein, the material of the second polarizer contains an infrared absorber.

2. The display device according to claim 1, characterized in that The second polarizer includes a substrate layer, a polarizing layer, a compensation layer and a bonding layer stacked in sequence, and the bonding layer is arranged close to the display panel; Wherein, the material of at least one film layer among the substrate layer, the polarizing layer, the compensation layer and the bonding layer contains the infrared absorber.

3. The display device according to claim 1, characterized in that The light with a wavelength of 800nm ​​to 1100nm emitted by the backlight module is converted into light with a wavelength of 400nm to 700nm after passing through the second polarizer.

4. The display device according to claim 1, characterized in that The infrared absorber includes an up-conversion material.

5. The display device according to claim 4, characterized in that: The up-conversion material includes at least one of an up-conversion organic light-emitting material based on triplet-triplet annihilation and a host material doped with rare earth ions.

6. The display device according to claim 5, characterized in that: The up-conversion organic light-emitting material includes at least one of bipyridine ruthenium, 9,10-diphenylanthracene, tetraphenylbenzoporphyrin platinum and perylene.

7. The display device according to claim 5, characterized in that: The matrix material doped with rare earth ions comprises a matrix material and rare earth ions doped in the matrix material, wherein the matrix material comprises at least one of halides, oxides, oxyhalides and sulfur-containing compounds, and the rare earth ions comprise Er 3+ 、Tm 3+ 、Dy 3+ , Tb 3+ 、Ho 3+ and Eu 3+ At least one of .

8. The display device according to any one of claims 1 to 7, characterized in that: In the film layer containing the infrared absorber, the mass of the infrared absorber accounts for 1% to 5% of the total mass of the material of the film layer.

9. The display device according to any one of claims 1 to 7, characterized in that: The transmittance of the second polarizer to light in the wavelength range of 800nm ​​to 1100nm is 0% to 40%.

10. The display device according to any one of claims 1 to 7, characterized in that: The transmittance of the second polarizer to light in the wavelength range of 400nm to 650nm is 80% to 100%.

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