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Method for manufacturing high-color gamut quantum dot film applicable between liquid crystal panel and backlight module

2021-07-05

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The utility model relates to the technical field of optical display, in particular to a high-color gamut quantum dot film that can be applied between a liquid crystal panel and a backlight module.

Background technique:


At present, quantum dots have only made practical progress in large-size TVs in the display field. The color gamut of TV screens produced by using quantum dot technology is 40% ntsc higher than that of traditional LED displays, and the current maximum can reach 130% ntsc. However, in terms of the production and manufacturing of quantum dot films, such as 3m's qdef quantum dot film, materials produced by South Korea and some domestic manufacturers, are limited by the fact that the quantum dot materials are not resistant to water and oxygen aging, which leads to aging of the film material and poor blue edges. Therefore, barrier films are used as the upper and lower barrier structures of the quantum dot film, but they still face the problem of aging edge failure.


At the same time, the development of small and medium-sized display devices in recent years is moving in the direction of narrow bezels or even no bezels. Display device screens usually include liquid crystal panels and backlight modules. Among them, the liquid crystal panel includes upper polarizing film and color filter from top to bottom. Sheet, liquid crystal, tft, lower polarizing film, the backlight module includes reflective film, light source, light guide plate, diffusion film, lower brightness enhancement film (debf or cedf), upper brightness enhancement film (debf or cedf) from bottom to top, Usually, a layer of oca glue is coated on the surface of the upper brightness enhancement film of the backlight module to combine with the lower polarizing film of the liquid crystal panel to form a liquid crystal display. However, since the existing backlight design schemes are to install a diffusion film in the backlight module to enhance the brightness of the screen, and when the frame range of the liquid crystal panel is small, the frame is difficult to completely block the blue light leaking from the edges of the backlight module. At present, 3m company uses qdef and other above-mentioned quantum dot film products to replace the existing diffusion film applied to small-size electronic products to reduce blue light. However, due to the influence of the backlight module frame size tolerance, its quantum dot film is matched with the size of the barrier film structure. It must be smaller than the backlight module, which makes the edge of the quantum dot film located inside the backlight module and cannot be aligned with the edge of the backlight module, causing blue light to leak from the edge, which still cannot completely solve the problem of edge light leakage; Some quantum dot films are combined with various materials, resulting in a decrease in their light transmittance, so there is also a problem of reduced brightness.


Technical realization elements:

The problem to be solved by the utility model is to provide a high color gamut quantum dot film that can be applied between the liquid crystal panel and the backlight module, which can effectively solve the problem of light leakage at the edge of the liquid crystal display screen of electronic products, and can have better brightness.


In order to solve the above technical problems, the present invention adopts the following technical solution: a high color gamut quantum dot film that can be applied between a liquid crystal panel and a backlight module, including a substrate layer, the surface of which is coated with a Adhesive layer, the adhesive layer is added with quantum dot particles that have undergone water vapor barrier treatment, the adhesive layer is compounded with a release material, and the substrate layer is pet or pmma or pc or another surface coating A barrier film with a water and oxygen barrier layer; by tearing off the release material, the adhesive layer can be combined with the lower polarizing film of the liquid crystal panel, and the substrate layer and the upper part of the backlight module can be brightened by oca glue The film is compounded to obtain a liquid crystal display that prevents light leakage.


Preferably, the light transmittance of the substrate layer is greater than or equal to 90%, the haze is ≤1.0, and the thickness is 8um-125um.


More preferably, the substrate layer is a barrier film coated with a water and oxygen barrier layer, the water vapor transmission rate of the water and oxygen barrier layer is less than 1.0g/m2×24h, and the oxygen transmission rate is less than 1.0ml/m2 ×24h.


Another solution of the present invention is a high-color gamut quantum dot film that can be applied between a liquid crystal panel and a backlight module, including a quantum dot acrylic film made of hea or iboa acrylic resin The uv is cured and formed, the quantum dot acrylic film is added with quantum dot particles that have undergone water vapor barrier treatment, and the quantum dot acrylic film is compounded with a layer of release material through an adhesive layer; by tearing off the release material, The adhesive layer is compounded with the upper brightness enhancement film of the backlight module, and the quantum dot acrylic film is compounded with the lower polarizing film of the liquid crystal panel through an oca glue, thereby obtaining a light leakage-proof liquid crystal display.


Preferably, the thickness of the quantum dot acrylic film is 15um-300um.


Another solution of the present invention is a high-color gamut quantum dot film that can be applied between a liquid crystal panel and a backlight module, including an adhesive layer, and the adhesive layer is added with quantum dots that have undergone water vapor barrier treatment Particles, the upper and lower surfaces of the adhesive layer are respectively pasted with a layer of release material; by tearing off the two layers of release material on the upper and lower surfaces of the adhesive layer, the adhesive layer can be used to connect the liquid crystal panel The lower polarizing film is combined with the upper brightness enhancement film of the backlight module to obtain a liquid crystal display screen that prevents light leakage.


In the above solutions, preferably, the adhesive in the adhesive layer is selected from one of epoxy resin, polyurethane resin, acrylic resin, and modified adhesive.


More preferably, the water vapor transmission rate of the adhesive layer is less than 1.0g/m2×24h, the oxygen transmission rate is less than 1.0ml/m2×24h, and its thickness is 5-50um.


More preferably, the quantum dot particles are composed of iib-via group elements or iiiv-va group elements, and have a diameter of 2-10 nm.


Wherein, the quantum dot particles are nanomaterials composed of zns and pbs as shell materials, and one or more of cds, cdse, cdte, znse, gan, and inas containing cadmium and zinc are added to the shell materials.

The beneficial effect of the present invention is that by using any of the above-mentioned high color gamut quantum dot films, it can be arranged between the lower polarizing film of the liquid crystal panel and the upper brightness enhancement film of the backlight module. Tolerance, it can be directly attached to the top surface of the backlight module, so that it can be aligned with the edge of the backlight module to prevent blue light from easily leaking from the edge, which effectively solves the existing quantum dot film (quantum dot adhesive layer composite double Layer barrier film) replacing the diffusion film in the traditional backlight module still causes the problem of light leakage at the edge of the backlight, because the quantum dot film of the present application can be combined with the existing polarizing film and brightness enhancement film without changing the structure and space. Use, the practicability is greatly improved; on the other hand, due to the simple structure of the quantum dot film, it can greatly avoid the decrease in light transmittance and ensure that the brightness of the liquid crystal display is at a higher level. After testing, the quantum dot film Compared with the LED display effect of the same model (a model in the market), the LCD display screen has been applied to a mobile phone. The display color gamut has increased from 67.8% to 103.2%, and the brightness has increased by more than 20%. The test is passed, and it can be used for flat panel and large-size display devices at the same time.

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