CN103676288A - Wide color gamut film, manufacturing method thereof, and display device with wide color gamut film - Google Patents

Abstract

A wide color gamut film and a method for making the same, and a display device having the wide color gamut film. When making the wide color gamut film, the type of backlight source used is first confirmed to determine the light band to be filtered, such as the surrounding bands adjacent to the red light, green light, and blue light bands. This allows the overall thickness and overall refractive index of the wide color gamut film to be determined, so that a plurality of high molecular polymer films with different refractive indices are prepared, and then a plurality of adjacent films with different refractive indices are combined according to the designed parameters to form a wide color gamut film. The invention also relates to a display device having the wide color gamut film, wherein the wide color gamut film is disposed between a panel module and a backlight module in the display device to reduce or filter the transmittance of one or more light bands of the backlight spectrum emitted by the backlight module to improve the problem of crosstalk between multiple bands of color light in the backlight spectrum.

Description

Wide color gamut film, manufacturing method thereof, and display device with wide color gamut film

technical field

The invention relates to a wide color gamut film and its manufacturing method and a display device with the wide color gamut film, especially a multilayer film made of a specific thickness and refractive index to filter a specific light band and a wide color gamut film equipped with the film A display device with a wide color gamut film.

Background technique

The function of the display is to reproduce the color. In the color reproduction technology, computer graphics processing can be used to reproduce the color of the image. Whether the color can be fully presented depends on the color gamut performance of the display. ability. A color gamut is a subset of colors. The most common application of a color subset is to accurately represent the true color in a specific environment, such as a color space (color space) or the display of an output device (such as a monitor). color range.

The structure of a general liquid crystal display (LCD) is mainly composed of a backlight module (Backlight module) and a liquid crystal panel (Liquid Crystal Panel). The liquid crystal panel itself does not emit light, and the light source must be provided by the backlight module. When making a display, in addition to the general display performance (such as resolution, response time, contrast, brightness), more emphasis is placed on the size of the color gamut of the display, and the performance of the color gamut mainly depends on the light source spectrum of the backlight module characteristics and spectral characteristics of the filter on the LCD panel.

The backlight module of the general liquid crystal display can be divided into direct backlight and side backlight according to its light-emitting mode. Backlight module design, its light source diffuses and mixes light through optical elements such as a diffusion plate and a diffusion film to become a uniform light source and then hits the LCD panel. However, US7252425 and US7580091 are edge-lit backlight modules. The light source is injected into the side of the light guide plate to form a uniform light source and then guide the light to the liquid crystal panel. The difference between the direct-lit backlight module and the edge-lit backlight module is that the light source setting method and the optical components are different. The main difference is that the space required by the direct-lit backlight module is generally larger than that of the edge-lit backlight module, but the direct-lit backlight module It is easier to make local dimming than the side light module. As described in the patent No. US7740364, the local dimming is used to increase the contrast ratio of the LCD screen through the setting of the direct backlight module. The edge-lit backlight module uses a light guide plate, so the thickness of the whole machine can be relatively thin, and regional light adjustment methods can also be used. However, due to the interference of light in each area, it is not as good as the direct-lit backlight module. Adjust brightness and contrast.

Generally speaking, since the liquid crystal requires a polarized light source to modulate the incoming light, the light source in the backlight module is generally a non-polarized light source such as a cold cathode fluorescent tube (CCFL) or a light emitting diode (LED), and there are other types Light tubes such as hot cathode tubes (HCFL), flat panel tubes (EFFL), organic light-emitting diodes (OLED), etc., so before light enters the liquid crystal, it is generally necessary to use a polarizer to convert the non-polarized light source into a polarized light source. The basic structure of the liquid crystal display can refer to the schematic diagram of each layer structure described in Figure 1. Each pixel of the liquid crystal display is composed of the following parts:

The main structure includes a liquid crystal layer 101, in which there are liquid crystal molecules, and the upper and lower sides are conductive glass 104, 105 formed by transparent electrodes (such as indium tin oxide) that generate an electric field between the liquid crystal molecules, and between the liquid crystal layer 101 and the conductive glass 104, 105 The alignment films 102 and 103 between them allow the liquid crystal molecules to rotate and arrange sequentially with their structure having grooves. There are many types of liquid crystal layer 101, such as twisted nematic liquid crystal (Twisted Nematic, TN) panel, vertical alignment liquid crystal (Vertical Alignment, VA), or plane switching liquid crystal (In-Plane Switching, IPS), etc., the liquid crystal layer The type of 101 often affects the contrast of the panel, viewing angle, color and brightness (Brightness).

The upper part of the display structure in the figure has a color filter (color filter) 106, and the inside of the color filter 106 is mainly composed of a color photoresist layer and a black matrix layer (Black matrix), wherein the color photoresist is mostly red (Red, R) green, (Green, G) and blue (Blue, B) are mainly three colors. The color photoresist can filter light to make it show various colors, while the black matrix layer can improve contrast and prevent various The interference of color mixing and light leakage will cause color impurity or decrease of color gamut, and the driving electrodes are generally transparent electrodes such as ITO and ZNO. Next, there are two polarizers 107, 108 whose polarization directions are perpendicular to each other on the upper and lower sides.

The backlight module 309 in Figure 1 mainly provides a uniform light source. The backlight module 309 is generally composed of many optical components (not shown in the figure), including light sources such as CCFL and LED, and optical plates such as diffuser plates and light guide plates. Films such as brightness enhancement film and diffusion film.

When imaging, when the light is emitted from the backlight module 109, the light passes through the polarizer 108 arranged below it to generate polarized light in one direction (P light or S light), and then passes through the liquid crystal layer 101, and the liquid crystal molecules are determined by the electric field and the alignment layers 102 and 103. The polarization direction of the light is rotated by the turning of the light, and the amount of passing light is determined by the polarizing plate 107 with different polarization directions above, so the brightness and grayscale control of the pixel can be realized.

The way to increase the color gamut of a general display can be by adjusting the spectrum of the backlight source. For example, using a light-emitting diode (LED) with a narrower light-emitting spectrum (Spectrum) as a backlight source can expand the color gamut of the display; ) backlight source due to the wide spectrum of the light source, after the filter, the color gamut is generally not wide, which is easy to cause color distortion. Moreover, the effect of the filter is limited, and there are often crosstalks between the penetration spectrums of the filters of various colors. The cross talk phenomenon causes the color gamut of the final liquid crystal display to be limited by the color gamut of the light filter and the light source in the backlight module 109 , which cannot effectively expand the color gamut.

For example, a backlight using light-emitting diodes can be used for direct type or edge type liquid crystal displays. The backlight uses white light-emitting diodes, and also uses three monochromatic colors of red, green and blue. Light-emitting diodes, wherein the backlight module using RGB three independent single-color light-emitting diodes has a wider light spectrum than the backlight using cold cathode tubes, that is, has a wider color gamut.

There is also a way to improve the color gamut performance through the manufacturing method of the optical filter in the display. The optical filter in the display structure shown in Figure 1 can be used to filter light by adding pigments or dyes during the production process. Printing, etching (Etching), inkjet (Ink jet), photolithography (Photolithography) and other different processes to make filters, to achieve light filtering by absorbing light, but the light source of most backlight modules passes through After the filter, almost two-thirds of the light source will be absorbed and lost, and it is difficult to control the dyes and pigments used on the filter during the production process, so there are problems of varying quality and it is difficult to accurately Control color and range.

Moreover, the filters of each color will produce crosstalk (Crosstalk) with each other. You can refer to the relationship between the light wavelength (in nanometers (nm)) and the transmittance (%) of the general filter shown in Figure 2, as shown in the figure The transmission spectra of the displayed spectral curve 2R (red), spectral curve 2G (green), and spectral curve 2B (blue) overlap with each other in the band transition intersection area, which is the phenomenon of crosstalk, which seriously affects the filtering The base of each display color of the chip makes the hue (Hue) of each color base impure, and finally causes the color gamut of the entire display to become smaller, and the colors that can be expressed are limited.

Contents of the invention

The method of increasing the performance of the color gamut of the display can not only be improved by a backlight module with better color performance, but also a method of adding a wide color gamut film in the display panel proposed in this specification. This wide color gamut film is mainly made by using the multi-layer film production method, designing the thickness of the multi-layer film and the refractive index of each layer of film according to the light band to be filtered, and stacking multiple layers of filters with different refractive indices. .

According to an embodiment of the present invention, a wide color gamut film for a display device is mainly provided between the inner panel module and the backlight module of the display device. The wide color gamut film is a combination of multiple layers of adjacent transparent films with different refractive indices. It has an overall thickness and an overall refractive index, and is used to weaken or filter the transmittance of one or more light bands of the backlight spectrum emitted by the backlight module. These multi-layered adjacent transparent films with different refractive indices are, for example, two kinds of films with different refractive indices stacked on each other, including a first film and a second film.

The wide color gamut film itself can have a microstructure on its surface, and can produce polarized or non-polarized wide color gamut films by uniaxial and biaxial stretching processes, so the wide color gamut film can form an absorbing or reflective polarizer. In terms of frequency spectrum design, the penetration spectrum of the wide color gamut film includes at least one band with a transmittance of less than 70%, 50% or 30%, such as the surrounding bands adjacent to red light, green light and blue light.

According to an embodiment, the method for manufacturing a wide color gamut film includes first confirming a type of backlight for which the wide color gamut film is applied, and then determining one or more light wavelength bands to be filtered, so as to determine an overall thickness and an overall thickness of the wide color gamut film. refractive index. Afterwards, according to the design of these thicknesses and refractive indices, multiple polymer films with different refractive indices are prepared, and then multiple adjacent films with different refractive indices are combined under a determined overall thickness to form a whole with a specific light source design. Thickness and bulk refractive index wide color gamut coating.

According to one of the embodiments, the plurality of polymer films with different refractive indices include at least two films with different refractive indices. In the process, a uniaxial or a biaxial stretching step can be used in the step of combining a plurality of adjacent films with different refractive indices to make the wide color gamut film polarized or non-polarized. In addition, a reflective polarizer or an absorbing polarizer can be attached to the wide color gamut film.

According to an embodiment of the present invention, the main components of the display device using the above-mentioned wide color gamut film include a panel module of the display device, a backlight module disposed on one side of the panel module, and a wide-color wide-color light module disposed between the panel module and the backlight module. domain membrane. The wide color gamut film is composed of multiple layers of adjacent transparent films with different refractive indices to form a film body with an overall thickness and overall refractive index designed according to the light source type of the backlight module. The function of the wide color gamut film is used to weaken Or filter the transmittance of one or more light bands of the backlight spectrum emitted by the backlight module, thereby improving the problem of crosstalk between the color lights of multiple bands in the backlight spectrum, improving the purity of the color, and thus improving the color gamut of the display range.

The above-mentioned panel module can be a panel module applied to a liquid crystal display device, wherein the main structure includes a liquid crystal layer, conductive glass arranged on both sides of the liquid crystal layer, alignment films on both sides arranged between the conductive glass on both sides and the liquid crystal layer, and the device There are two first polarizers and second polarizers whose polarization directions are perpendicular to each other on the outside of the structure composed of the liquid crystal layer, the conductive glass on both sides and the alignment films on both sides.

In particular, the wide color gamut film is designed according to the type of backlight source. The light source installed in the backlight module can be a cold cathode ray tube, a light-emitting diode with three primary colors, a light-emitting diode containing phosphor, or a light source mixed with light-emitting diodes. , or light sources with organic light emitting diodes.

Description of drawings

FIG. 1 shows a schematic diagram of the basic structure of a prior art liquid crystal display;

Figure 2 shows the relationship between the light wavelength and the transmittance of the filter;

FIG. 3 shows one of the structural schematic diagrams of an embodiment of a display device using a wide color gamut film in the present invention;

Fig. 4 shows the second schematic diagram of the embodiment of the structure of the display device using the wide color gamut film of the present invention;

Figure 5 is a schematic diagram of a structural embodiment of a wide color gamut film of the present invention;

Figure 6 describes the process embodiment steps of the wide color gamut film of the present invention;

Figure 7A depicts the spectrum of a cold cathode ray tube;

Figure 7B depicts the spectrum of the relative intensities of the colors in a cold cathode ray tube;

Figure 7C depicts the chromaticity space of a cold cathode ray tube;

Figure 8A depicts the spectrum of a white light emitting diode;

Figure 8B depicts the spectrum of the relative intensity of each color in a white light emitting diode;

Figure 8C depicts the chromaticity space of a white light emitting diode;

Figure 9A depicts the spectrum of a three-color mixed white light emitting diode;

FIG. 9B depicts the spectrum of the relative intensity of each color in a three-color mixed white light-emitting diode;

FIG. 9C depicts the chromaticity space of a white light-emitting diode with three-color mixed light;

Figure 10 describes one of the characteristics of the wide color gamut film embodiment disclosed in the present invention;

Figure 11 describes the second characteristic of the wide color gamut film embodiment disclosed in the present invention;

Figure 12 describes the third characteristic of the embodiment of the wide color gamut film disclosed by the present invention;

FIG. 13A shows one of the light intensity characteristic diagrams of the application of the wide color gamut film;

Figure 13B shows one of the chromaticity space characteristic diagrams of the application of the wide color gamut film;

FIG. 14A shows the second light intensity characteristic diagram of the application of the wide color gamut film;

Figure 14B shows the second characteristic diagram of the chromaticity space using the wide color gamut film;

FIG. 15A shows the third light intensity characteristic diagram of the wide color gamut film;

FIG. 15B shows the third characteristic diagram of the chromaticity space using the wide color gamut film.

[Description of main component symbols]

Liquid crystal layer 101 alignment film 102,103

Conductive glass 104,105 Color filter 106

Polarizer 107,108 backlight module 109

Spectral Curve 2R Spectral Curve 2G

Spectral Curve 2B

LCD module 301 Wide color gamut film 310

Conductive glass 302,303 Polarizer 304,305

Backlight module 309

LCD panel module 40 Wide color gamut film 410

Liquid crystal layer 401 alignment film 402,403

Conductive glass 404,405 Color filter 406

The first polarizer 407 The second polarizer 408

Backlight module 409

First Film A Second Film B

Red light band 7a, 8a, 9a Red light distribution 7a', 8a', 9a'

Green light band 7b, 8b, 9b Green light distribution 7b’, 8b’, 9b’

Blue light band 7c, 8c, 9c Blue light distribution 7c’, 8c’, 9c’

Color gamut 7N, 7C, 8N, 8C, 9N, 9C

Improved red light distribution 7a”, 8a”, 9a’’

Improved green light distribution 7b”, 8b”, 9b’’

Improved blue light distribution 7c”, 8c”, 9c’’

Improved color gamut 7C', 8C', 9C'

Area 9d, 9e

Steps S601~S613 wide color gamut film process

Detailed ways

The backlight module in the liquid crystal display is mainly divided into direct type (direct type) backlight source and side type (edge type) backlight source. Diodes (LEDs) and Organic Light Emitting Diodes (OLEDs), etc. The light emitted by the light source in the backlight module will pass through many optical elements on the way. After reflection, refraction, interference and other phenomena, the energy of the light will be seriously absorbed. After the light passes through the polarizer (Polarizer) in the display panel, Although it will cause polarized light, the light energy has been seriously absorbed by the polarizer at this time. After the polarized light passes through the liquid crystal and the color filter (Color Filter), it will determine the color and intensity of each pixel on the panel. .

The spatial range in which each pixel on the display panel can display color is called the color gamut (ColorGamut). One of the performance of color gamut, if the light source is not good enough, no matter how good the design of the display is, the performance of its color gamut will be affected. Therefore, if the color gamut of the backlight module can be increased, the color gamut displayed by the final liquid crystal panel can be increased.

When the primary colors of the backlight source (usually red, green, blue or yellow) are purer, the colors that can be expressed are wider, and the performance of the color space (color space, or color gamut) is better, so it emits light in three primary colors Displays with diodes (LEDs) as the backlight source have a better color gamut, especially direct-type backlight sources. If you want to use cathode tubes (CCFL) or light-emitting diodes with phosphors as the backlight of the display, and at the same time produce better color gamut performance, you must filter out bad light through better color filters, but , the general filter is not designed to filter a specific band, therefore, based on this motivation, the present invention proposes a wide color gamut film made with multi-layer film technology to improve the display by filtering out unsuitable light Color gamut performance.

The present invention provides a wide color gamut film, a display device with the wide color gamut film and a method for making the wide color gamut film. In addition to generally improving the characteristics of the light source to improve the color gamut performance of the display, this specification especially proposes a A wide-color gamut film installed in a display device. This wide-color gamut film can be designed for the light emission spectrum of light sources such as cold cathode tubes, light-emitting diodes, or organic light-emitting diodes, so that various light sources can pass through a specific wide range. After the color gamut film, the spectrum of a specific band can be filtered to make the emitted light wavelength narrower and purer, thereby achieving the function of increasing the color gamut performance of the display device. The design of the present invention can filter out the light that requires a specific waveband (at least one waveband, two wavebands, or more) for the object to be designed (light source).

Referring to FIG. 3 , one of the structural schematic diagrams of an embodiment of a display device using a wide color gamut film of the present invention is shown.

In this embodiment, it mainly means that a wide color gamut film 310 made by a multi-layer film process is provided in a known liquid crystal display device, especially in a display panel (including a liquid crystal module) that provides specific display image and image modulation functions. 301, conductive glass 302, 303, polarizer 304, 305) and the backlight module 309 (including various light sources).

In addition to the above-mentioned display panel and backlight module 309 , the display device has spaces for accommodating various optical elements, such as optical films that can be provided with effects such as light enhancement and uniform light, especially the wide color gamut film 310 proposed in this disclosure. According to an embodiment, the wide color gamut film 310 is composed of at least two optical films that are repeatedly stacked, and its main function is to design the emission spectrum of various light sources in the backlight module 309, and to reflect the color of the light source or optical filter. Specific bands of light to enhance the color gamut of the display. Due to the wide distribution of light frequency bands emitted by general light sources, this manual uses the multi-layer film process to make a film body that can filter out one or more specific light bands. After combining with the original display panel module or backlight module, it can make the emission The light wavelength is narrower and purer, which increases the color gamut performance capability of the display device.

FIG. 4 is another schematic diagram showing an embodiment of the structure of a display device using a wide color gamut film according to the present invention.

The main structure of the liquid crystal display device is the panel module of the display device. If the liquid crystal display is taken as an example, the liquid crystal panel module 40 in the figure includes a liquid crystal layer 401, and the upper and lower sides are formed by transparent electrodes that generate a uniform electric field in the liquid crystal layer 401. Conductive glass 404, 405, between the liquid crystal layer 401 and the conductive glass 404, 405 is provided with an alignment film 402, 403 that dominates the rotational alignment of liquid crystal molecules. If a color liquid crystal display is taken as an example, there may be a color filter 406 on the structure, on the upper and lower sides of the entire panel module (outside of the structure composed of the liquid crystal layer 401, conductive glasses 404, 405 on both sides, and alignment films 402, 403 on both sides) and There are two polarizers whose polarization directions are perpendicular to each other, such as the first polarizer 407 and the second polarizer 408 shown in the figure.

According to the embodiment of the invention, a backlight module 409 is provided on one side of the above-mentioned liquid crystal panel module 40, and a wide color gamut film 410 is provided between the liquid crystal panel module 40 and the backlight module 409, and the position of the wide color gamut film 410 can be changed as required , is not limited to the bottom of the liquid crystal panel module 40 shown in the figure.

The wide color gamut film 410 is composed of multiple layers of adjacent transparent films with different refractive indices. It should be noted that the refractive index of the material may change due to the different polarization forms of light.

The wide color gamut film 410 itself is composed of a multilayer film (Multilayer film), and the material is mainly composed of light-transmitting polymers (Polymer). The actual number of optical film stacks that make up the wide color gamut film 410 ranges from tens of layers to several There are as many as one hundred layers. This kind of multilayer optical film uses the principle of optical interference to change the optical characteristics, also known as optical interference film. The general optical interference film is composed of several layers of films or film stacks with different refractive indices, and the composition is a light-transmitting dielectric (Dielectric). The thickness of each film stack inside the wide color gamut film 410 is generally about 50 nm to 1000 nm. The function of optical interference film is an optical element that can pass light in a specific wavelength range or reflect light in other wavelength ranges. It is currently used for filtering such as spectral band-pass, band-stop, long-wave pass or short-wave pass. Optical sheets, luminous flux modulation devices, optical switches, optical information storage devices, anti-counterfeiting labels, etc. The wide color gamut film 410 of the present invention utilizes the principle of optical interference: when two or more light waves overlap and the optical path difference between the two is an integer multiple of the wavelength, it is called "in-phase", thus forming a "phase" of intensity addition. Constructive interference", at this time the reflectivity increases; if the optical path difference between the two is an integer multiple of half the wavelength, it is called "anti-phase", thus forming a "destructive interference" with destructive intensity, at this time the reflectivity reduce.

Therefore, by repeatedly stacking film stacks of different materials and thicknesses, it is possible to design an optical interference film that reflects specific wavelengths of light and passes through other wavelengths. The wavelength range of light can be adjusted according to requirements.

The setting and manufacturing method of the wide color gamut film 410 can refer to US Patent No. 3,610,729 (announced in October 1971), No. 3,711,176 (announced in January 1973) and No. 5,976,424 (announced on November 2, 1999). Japan) and other patents, in which the use of at least two polymer materials with different high and low refractive indices is extruded (Extrusion) and then extended by an extension machine to change its molecular alignment and refractive index to cause polarized reflection characteristics. This mechanism is used That is, optical properties such as reflectance, transmittance, polarization state and degree of polarization of light entering the wide color gamut film 410 can be controlled. For a detailed description of the optical interference theory of multilayer optical films, please refer to the principles of H.A.Macleod's Thin-film optical filters and R.M.A.Azzam's Ellipsometry and polarized light books.

The wide color gamut film can be made of PET (poly(EthyleneTerephthalate)) and PMMA (polymethyl methacrylate, Poly(Methyl methacrylate)) as optical stacking layer materials, and other polymers can also be used Materials such as PET, PEN (polyethylene naphthalate, Poly (Ethylene Naphthalate)), PLA (polylactic acid), PMMA, PS (polystyrene, Poly Styrene), ETFE (tetrafluoroethylene copolymer) or The polymer material of different polymer materials mixed (Blending) is used as the material of the wide color gamut film. For example, PET and PEN are mixed in a certain proportion as a polymer material.

When extruding a wide color gamut film, a thicker protective layer (Skin layer, not shown) is usually coated on the outermost surface of the optical film stack, and it is produced together in the extrusion process. The thicker protective layer The layer can increase the flow channel stability of the multi-layer flow channel feed block (Feedblock) in the process, and the protective layer can protect the multi-layer film structure from being damaged by the excessive shear force of the flow channel during extrusion flow. The structure of the multilayer optical film stack is destroyed. It is also possible to add polymer nano-diffusion particles, or other functional particles such as nano-metal or metal oxide particles or ceramic powder particles, dyes or toners, etc. inside each optical film stack and protective layer, or to set microscopic particles on the surface of the protective layer Structure (Micro structure) to increase the diffusion or light-gathering ability of the wide color gamut film. The wide color gamut film setting mechanism of diffusing or concentrating light will be beneficial to the optical path of light mixing, especially for point light sources like LED, it is more conducive to increasing the color uniformity of each color of LED after color mixing.

It is worth mentioning that if the wide color gamut film described in this disclosure wants to improve the optical reflectance or physical mechanical properties, it can be stretched by a stretching machine to change its molecular alignment and refractive index to increase the optical reflectance of a specific wavelength band . When the wide color gamut film is produced, a post-processing can also be added to improve the optical and physical mechanical properties. For example, the change of its refractive index can be increased through uniaxial or biaxial stretching. The biaxial stretching can be divided into sequential biaxial stretching or biaxial stretching. At the same time, biaxial stretching, after stretching a specific material, can increase the difference in refractive index value in a specific direction, which will reduce the number of layers and total thickness of the polymer material stack in the wide color gamut film, thereby reducing the total cost of the material.

If the wide color gamut film adopts uniaxial stretching, the stretching ratio varies with different materials, and the stretching ratio can generally be 1 to 10 times; if the wide color gamut film material includes a birefringence (Birefringence) molecular material. A birefringent material is a certain material that can produce a certain value of phase difference (Phase difference) when the refractive index in the X, Y, and Z directions is at least not completely equal, that is, when Nx≠Ny or Ny≠Nz or Nx≠Nz, Therefore, a phase retardation (Retardation) function is produced on the light, wherein Nx, Ny, and Nz are the refractive indices of the material in the X, Y, and Z directions, respectively. Using this birefringent material to change the phase difference of the light can change the specific polarization state of the light. At this time, the wide color gamut film has the functions of adjusting the phase difference and the polarization state of the light, and becomes a filter. Optical film with reflective polarizer.

The wide color gamut film can penetrate the linearly polarized light of a specific narrow band through the design of the stacked material of the multi-layer film. The wide color gamut film is set in the backlight module, and the relative angle between the wide color gamut film and the LCD panel is adjusted. Generally, the setting The direction of the wide color gamut film will maintain a specific angle between the reflection axis of the wide color gamut film and the liquid crystal panel. The angle must be changed according to the arrangement of the polarizer attached to the panel. The wide color gamut film is placed under the display panel. In the backlight module, according to the embodiment, if the wide color gamut film is placed above the light guide plate or the diffuser plate, a high brightness effect can generally be obtained; if the wide color gamut film is placed under the diffuser plate or the light guide plate, it can Obtain high uniformity optical effect.

One of the main functions of the wide color gamut film 410 is to adjust the transmittance (transmittance) of one or more light bands of the backlight spectrum emitted by the backlight module 409. When the light is emitted from the backlight module 409, the light passes through the wide color gamut film 410 can filter out specific light bands because the wide color gamut film 410 weakens its reflection or filters out the energy of one or more specific light bands. The problem of crosstalk between the color lights of different bands can be solved, and the color gamut performance capability of the display device can be improved by this. Taking the backlight module 409 that generates red light, green light, and blue light as an example, the purpose of the wide color gamut film 410 here is to reduce crosstalk between red, green, and blue light bands.

The structure of the wide color gamut film can refer to Figure 5. The design of the structure is mainly based on the wavelength band to be reflected. The wide color gamut film itself is composed of multilayer films, and the number of optical film stacks ranges from dozens to There are as many as hundreds of layers, and the function is to allow light in a specific wavelength range to pass through, or to reflect light in other wavelength ranges. This example shows adjacent films with different refractive indices (this example shows that the first film A and the second film B are stacked to form tens to hundreds of layers), and the thickness (d) of each layer of A and B layers is related to the refractive index. The ratio (n, related to the material) is determined according to the object to be designed, and the purpose of the overall film having a specific refractive index is achieved by repeatedly laminating the structure of two films, and a wide color gamut film of a specific thickness is formed at the same time. Especially in order to meet specific requirements, the wide color gamut film can produce birefringence (Birefringence) physical characteristics under the matching of materials and processes according to process design. The transmission spectrum curve of the wide color gamut film can be measured by a spectrometer (Spectrum meter).

According to one of the embodiments, the structural design of the wide color gamut film can be based on the physical characteristics that the wavelength is equal to four times the refractive index (n) multiplied by the thickness of the multilayer film (d), so the desired reflection band can be achieved by stacking multiple layers of films According to the requirements of the multi-layer film, after laminating the multi-layer film, in addition to determining the overall refractive index, the reflectance matrix of the multi-layer film stack can be calculated through the interference principle, and the wide color gamut film 410 at this time can be precisely calculated. reflection spectrum.

In addition to the main film body of the above-mentioned wide color gamut film, other optical characteristics can also be produced through the surface structure produced by the process or by adding other functional films. For example, the surface microstructure can be used to produce the functions of light concentrating, refracting light, and uniform light, and other optical structures on the surface can also be equipped with functional films to protect the multilayer film. Implementation of the microstructure: The surface microstructure can be formed on the surface during the process, which can be a prism structure, a pyramid structure, and a cylindrical structure. The surface microstructure of the wide color gamut film can be one or a combination of them. In this way, the function of light uniformity can be performed, and the structure of protecting the inner multilayer film can also be provided.

At the same time, reference can be made to FIG. 6 to describe the process steps of making the multi-layer adjacent films with different refractive indices as shown in FIG. 5 .

According to the embodiment of the manufacturing method of the wide color gamut film of the present invention, it is first necessary to confirm the type of the backlight source (step S601), such as cold cathode ray tube, light-emitting diode with three primary colors, white light source blended by light-emitting diode, and organic light-emitting diode Different types of light sources have requirements for filtering light in different wavelength bands, and reference can be made to various implementations described in the present invention.

After the type of light source is confirmed, as in step S603, multiple light bands to be filtered (such as the surrounding bands adjacent to red light, green light and blue light) can be determined at the same time, so that the overall structure of the wide color gamut film can be designed, including The thickness and the overall refractive index of the overall wide color gamut film (step S605 ). In step S607, the process obtains a plurality of thin films with different refractive indices, including at least two thin films with different refractive indices, and the material of the thin films is mainly polymer. As another example in step S609, multiple adjacent films with different refractive indices are combined under a certain thickness, wherein a plurality of adjacent films with different refractive indices are combined through a process, such as combining multiple films by bonding and pasting to form a A film body with a specified overall thickness and refractive index is used to form a wide color gamut film corresponding to a specific light source (step S611 ).

Finally, the wide color gamut film is combined with the display panel (step S613 ), as shown in the embodiment shown in FIG. 3 or FIG. 4 . The wide color gamut film is placed under the panel, and the panel can be bonded or fixed separately. If it is bonded to the panel during fixing, it can be bonded with pressure sensitive adhesives (Pressure Sensitive Adhesives, PSA) or UV curing. , if possible, the pressure-sensitive adhesive or curing adhesive bonded to the panel can be made of low refractive index material (refractive index about 1.1~1.4) to improve the brightness and uniformity of the panel, and the surface of the wide color gamut film can also be provided with microstructures Body such as prism (Prism) or microlens (Microlens), pyramid structure, etc. to concentrate light to increase brightness and uniformity. If it is not installed on the panel, as far as the installation method between the backlight module and the wide color gamut film is concerned, it can be combined with a mechanical fixation method, or a pressure sensitive adhesive (Pressure Sensitive Adhesives, PSA) can be used for bonding, or heat can be used. Curing or UV curing glue or other chemical bonding methods can be used to place the wide color gamut film on top of the brightness enhancement film or diffusion film or diffusion plate or light guide plate.

In the above process, in particular, the above-mentioned display panel may also include polarizers or non-polarizers, and the polarizers may also be absorbing polarizers or reflective polarizers, so the wide color gamut film proposed in this specification can have auxiliary The design of other functions of the display panel.

For example, in the multi-layer film process, it can be combined with bonding and bonding multiple films, supplemented by uniaxial (Uniaxial stretch) or biaxial (Biaxial stretch) stretching to make the wide color gamut film itself polarized or It does not have the function of polarizing, which makes the achromatic film add the effect of polarization conversion in the process. The wide color gamut film itself has partial polarized light conversion capability due to the birefringence generated by the extension, but it may have relatively low polarized light reflectivity due to color considerations. In order to enhance its polarization conversion ability more effectively, an absorbing polarizing film or a reflective polarizing film can also be attached to one side of the wide color gamut film, so that the wide color gamut film has dual functions of color and polarization conversion. For example, when you want to make an absorbing wide color gamut film, you can stick an absorbing polarizer on one side of it, and make a reflective wide color gamut film by sticking a reflective polarizer on one side. , and then combined with the panel or backlight module.

Therefore, the wide color gamut film described in this specification can be a reflective wide color gamut film or an absorptive wide color gamut film. If applied to a display panel without a polarizer, a reflective wide color gamut film of the present invention can increase brightness , and replace part of the polarizing effect in the display panel; if it is an absorbing wide color gamut film, it can increase brightness. If applied to a display panel that already has an absorbing polarizer, the reflective wide color gamut film can increase panel contrast and brighten; if it is an absorbing wide color gamut film, it can effectively increase contrast and partially brighten .

According to the embodiments described in this disclosure, the wide color gamut film can be attached below the display panel and above the backlight module, which can increase the color gamut of the display, and can be combined with other functional films, such as reflective polarizers or absorbing Polarizing plate to increase the contrast and polarization of the panel. If microstructures are installed on the surface of the wide color gamut film, or low-refractive pressure-sensitive adhesive or curing adhesive is used when bonding the panel and the backlight module, it can be added to promote light concentration. Effect with mixed light.

If the spectrum of the wide color gamut film is narrow and pure enough, and it is designed according to a specific wavelength band, the original filter of the display can be removed at this time, and a certain color gamut can still be maintained. The high-speed switching backlight of light-emitting diodes will be able to achieve backlight modules and displays without filters. At this time, the wide color gamut film itself can replace the filters, and at this time, reflective polarizers or absorbing polarizers can also be installed. board with a wide color gamut film to increase brightness at the same time.

The design requirements of the wide color gamut film can make its transmission spectrum have a discontinuous distribution in the transmission spectrum of a specific wavelength range, and the transmittance of this discontinuous range of wavelengths will be significantly lower than that of other adjacent bands. Especially close to where the crosstalk interference that color filters would otherwise create. The transmittance of the wide color gamut film will reach a relatively low value, so the wide color gamut film will have discontinuous low transmittance bands where crosstalk may occur. This discontinuous band requires that its transmittance is generally The lower the better.

The wavelength range of electromagnetic waves perceptible by ordinary human eyes is between 400 nanometers (nm) and 780 nanometers, and the wavelengths of the three primary colors that produce full-color light are about: the light band of red (R) visible light is about 620-750nm, green (G) The light band of visible light is about 495-570nm and the light band of blue (B) visible light is about 450-475nm. Of course, the division range of this band interval is also a preliminary division of the light source into red, green and blue ranges. The light source type set by the display can refer to the examples listed in this manual.

Figure 7A depicts the transmission spectrum of a general light source cathode ray tube (CCFL), where the vertical axis is the relative intensity (%) of the light source, and the horizontal axis is the wavelength (nm), which shows multiple obvious peaks, including those in the red light band 7a, 7b in the green band and 7c in the blue band, the performance of each color is not uniform, and 7a, 7b, and 7c in this figure only roughly distinguish the spectral regions of red, green, and blue light in cold cathode tube light sources. The spectrum of the cold-cathode tube light source is roughly divided into three primary color spectra, but it can be known that this spectrum is very different from the spectrum of narrow-wave light sources such as laser light.

FIG. 7B then describes the transmission spectrum of the relative intensity of each color in the cold cathode ray tube. In this example, the intensity performance of each color is obtained through red, green and blue filters. It can be seen from the figure that the intensity distribution of blue light produced by the blue filter is shown as curve 7c', the intensity distribution of green light produced by the green filter is shown as curve 7b', and the curve 7a' is shown as cold cathode The intensity distribution of the red light produced by the ray tube through the red filter.

Looking at the intensity performance of each color of the cold cathode ray tube in this figure, the distribution of each color can extend to other bands, and the distribution is quite wide, indicating that the color is not pure.

Figure 7C continues to describe the chromaticity space of the cold cathode ray tube. The color gamut 7C in the figure represents the color gamut performance of a general cold cathode ray tube in the color space (color space), while the color gamut 7N represents NTSC (according to the American National Television Standard The standard chromaticity space representation of the color television broadcasting standard formulated by the National Television System Committee). The color gamut 7C of this example has not matched the wide color gamut film proposed by the present invention, so it can be used as a comparison of the effect of the present invention.

Figure 8A then shows the transmission spectrum of a white light-emitting diode (LED), which passes through the blue crystal grains and excites the yellow phosphor to produce white light. From the spectrum of this example, it can be seen that the blue light band 8c is distributed in the left area of the chart, but there is no obvious separation between the red light and green light band (8a, 8b) areas, so the wide color gamut disclosed by the present invention The film can significantly improve the effect of color gamut in such light sources.

Figure 8B depicts the transmission spectrum of the relative intensity of each color in a white LED. Also use the red, green and blue filters to filter out the light of the white light-emitting diode, showing the blue light intensity distribution curve 8c' produced by the blue filter and the green light intensity distribution produced by the green filter respectively. Curve 8b', and red light intensity curve 8a' generated by the red filter. The intensity curves of each color in the figure can be used as a control group for whether to use the wide color gamut film of the present invention.

From the distribution of each color shown in the figure, it can be seen that the white light-emitting diode is the light source, and the performance of each color has a certain intensity distribution in each band, and each color also overlaps, which is the part known to cause crosstalk.

FIG. 8C depicts the chromaticity space of the white light emitting diode, wherein the color gamut of 8N is the color gamut of the standard NTSC, and the color gamut of the white light emitting diode is represented as 8C, and the performance of the color gamut can be determined by the enclosed area.

Figure 9A describes the transmission spectrum of a white light-emitting diode with three-color mixed light. If white light is formed by mixing multiple light-emitting diodes, you can refer to the white light source formed by mixing red, green and blue light-emitting diodes as shown in Figure 9. spectrum.

The light source of this type of three-primary-color light-emitting diode can generally be used as the preferred embodiment of the backlight source. It can be seen from the figure that a blue light band 9c is formed near the blue light wavelength range, and a green light band 9b is formed near the green light wavelength range. There is a red light band 9a near the red light wavelength range. The spectrum also shows that there are obvious discontinuities and low transmittances in specific light bands, as shown in the figure, there are obvious discontinuities and low transmittances at 500nm (9d) and 600nm (9e), while the low transmittance The bandwidth of the frequency band is about tens of nanometers.

Referring again to the transmission spectrum of the relative intensity of each color in the three-color mixed light-emitting white light-emitting diode shown in FIG. Has performed well in terms of strength. The red light distribution in the figure is represented by the curve 9a'. Obviously, except for the main red band (near 650nm), the rest of the bands still have some noise distribution, but the overall performance has been good; the green light distribution is represented by the curve 9b'. Except around 550nm, there is no obvious prominent intensity distribution in other parts; the blue light distribution is represented by curve 9c', and there is no obvious prominent place outside the main distribution 460nm.

The chromaticity space described in FIG. 9C includes the standard color gamut 9N of NTSC and the color gamut 9C of the three-color mixed white LED in this example.

According to the application of the above-mentioned various light sources, if combined with the wide color gamut film provided by the present invention, the coverage range (crosstalk) between each optical band can be adjusted appropriately. The main purpose is to reduce the most serious band range of crosstalk, but the low The wider the bandwidth of the transmittance, the more light will not be able to penetrate, and the luminance of the corresponding LCD panel will also be reduced. Therefore, the design of the wide color gamut film should still consider the emitted light intensity and luminance, but roughly The lower the value of the transmittance spectrum, the lower the crosstalk problem in a specific band.

However, in terms of using filters to improve color gamut performance, in order to filter out most of the bad light, it usually affects the brightness, and after the polarization function in the panel or the filter itself produces polarized light, it will also At least half of the brightness is sacrificed. Therefore, the design of the wide color gamut film of the present invention needs to consider both the improvement of color gamut performance and the loss of brightness. According to the example described in the embodiment of the present invention, the spectrum (transmittance spectrum) of the wide color gamut film is generally selected to be lower than 70% at the lowest transmittance value (at least one band range), preferably It is lower than 50%, or even lower than 30% (at least one band range, please refer to Figure 10 and Figure 11). Generally speaking, the measurement of the transmission spectrum of the wide color gamut film of the present invention is measured and described with natural unpolarized light (that is, the average value of P light plus S light). It is necessary to use a polarizer (such as a polarizing plate) in a spectrometer to create a specific polarized light and then measure its polarization transmission spectrum.

Accordingly, the following figures will show the characteristics of the wide color gamut film proposed by the present invention, as well as the experimental data of the optical filter used as the above-mentioned various light sources.

Example 1 of wide color gamut film:

The characteristics of one embodiment of the wide color gamut film formed by applying the multi-layer film technology in the present invention can be seen in FIG. 10 .

After repeatedly overlapping multiple layers of transparent films with different refractive indices adjacent to each other, a wide color gamut film with the characteristics shown in Figure 10 is formed, which has the multilayer film thickness and overall refractive index set in the specific requirements item, and this The characteristics of the example are mainly that there is a significantly reduced transmittance near the light wavelength range of 500 nm and 600 nm, which is lower than the above-mentioned 70%, 50% or 30% lower (refer to the transmittance depicted by the dotted line), Especially the surrounding bands adjacent to red light, green light and blue light, and the rest maintain a high transmittance. Therefore, this wide color gamut film can effectively block specific light from passing through these two places, achieving a reduction in purpose of crosstalk effects.

The embodiment of the wide color gamut film with the characteristics shown in Figure 10 is applied to the cold cathode ray tube (spectral characteristics can refer to Figure 7A), that is, the light of the cold cathode ray tube passes through the wide color gamut film with the characteristics shown in Figure 10, and passes through The spectral distribution of each color transmitted through the wide color gamut film can refer to the relationship between the relative light intensity (%) and the wavelength shown in FIG. 13A.

Compared with the light source characteristic diagram of the cold cathode ray tube in FIG. 7B, the effect produced by using the wide color gamut film shown in FIG. 10 (shown in FIG. 13A) is obviously improved in the distribution of each color. After comparing the characteristic diagrams, Figure 13A shows that there are three curves, which respectively represent the light passing through the wide color gamut film of the present invention, and then filtered to form an improved red light distribution 7a", an improved green light distribution 7b" and an improved The relative intensity of the blue light distribution 7c" and its surrounding bands of light. After experiments, each color spectrum does have significantly higher relative intensities near the wavelength ranges of the three primary colors such as red, green, and blue, that is, this wide color gamut film (Using the wide color gamut film with the characteristics shown in Figure 10) effectively filters out the light near the wavelength of 500 nm and 600 nm, so that the light source can perform relatively well in the three primary color light bands, thus improving the color gamut performance of the light source ability.

Figure 13B then shows that after passing through the wide color gamut film with the characteristics shown in Figure 10, the expression in the chromaticity space is as shown in the color gamut 7C', the area of this area has been calculated to exceed the above-mentioned Figure 7C, and the wide color of the present invention has not been implemented. The color gamut of the gamut film is 7C.

After calculation, the color gamut 7C in Figure 7C accounts for 50.6% of the area of the NTSC standard color gamut, and after the wide color gamut film, the area of the color gamut 7C' accounts for 55.8% of the area of the NTSC standard color gamut, indicating that the wide color gamut The use of films has improved the color gamut performance capabilities of cold cathode ray tubes.

Wide color gamut film embodiment two:

The characteristics of the wide color gamut film shown in Figure 11 are that the light transmittance around 470nm, 590nm and 700nm can be close to zero respectively, corresponding to the wavelength range of the three primary colors of light (such as the red visible light band is about 620-750nm , the green visible light band is about 495-570nm, and the blue visible light band is about 450-475nm), so it can effectively highlight the transmittance performance of the three primary colors of light. Other designs according to actual needs do not rule out the possibility that the light transmittance is close to zero, especially as depicted by the dotted line, the surrounding bands of adjacent red light, green light and blue light are lower than the above-mentioned 70%, 50% or lower 30%.

When the white light-emitting diode shown in Figure 8A passes through the wide color gamut film of this example, it should be able to filter out the light corresponding to the three bands shown in the figure, and the experimental results are shown in Figure 14A in terms of the intensity of each color. Among them, the light in the wavelength range of about 450nm to 470nm and about 570nm to 620nm has been filtered out, so it shows an improved red light distribution 8a", an improved green light distribution 8b" and an improved blue light distribution 8c". Color gamut performance can refer to Figure 14B.

The color gamut 8C' in Figure 14B can be compared with the color gamut 8C in Figure 8C, which shows the color gamut performance after using the wide color gamut film of the present invention. After calculation, the area of the color gamut 8C is 48.4% of the NTSC standard color gamut area , and after applying the wide color gamut film of the present invention, the area of the color gamut 8C' has been improved to 58.7% of the area of the NTSC standard color gamut. It means that the use of this wide color gamut film has improved the color gamut performance of white light emitting diodes.

Wide color gamut film embodiment three:

From the third embodiment of the wide color gamut film of the present invention shown in Fig. 12, it can be seen that the transmittance is obvious between 400 nm to 440 nm, between 480 nm to 530 nm, and between 580 nm to 620 nm. Reduced to zero characteristics, this type of wide color gamut film can block the light of a specific light source and reduce the light penetration of green to zero in these three regions, especially the surrounding wavelength bands adjacent to red light, green light and blue light are lower than the above 70 %, 50%, or less than 30%, as indicated by the dotted lines, can highlight the range of the three primary colors (red, blue, green) of light produced by a particular light source.

Applying the wide color gamut film with the characteristics shown in this figure, Figure 15A shows the three-color light performance of the white light-emitting diode with three-color mixed light passing through the wide color gamut film, as shown in Figure 15A, after the improvement, the red light distribution 9a" is in 440nm to 480nm obviously has outstanding intensity performance, where the light on both sides has been filtered out by the wide color gamut film; the improved green light distribution 9b" has outstanding intensity performance at 530nm to 580nm; the improved blue light distribution 9c" There is an obvious intensity performance between 620nm and 670nm.

Fig. 15B then shows that the three-color mixed white light-emitting diode passes through the wide color gamut film of this example, and the color gamut 9C' has been significantly improved compared with the color gamut 9C in Fig. 9C. According to calculations, the color gamut 9C in Figure 9C accounts for 59.6% of the area of the NTSC standard color gamut, and after the adjustment of the wide color gamut film, the color gamut 9C' in Figure 15B has been improved to 73.6% of the NTSC standard color gamut.

The above examples only take specific wide color gamut films and specific light sources as examples. The main purpose is to demonstrate the efficacy of the wide color gamut films of the present invention through experiments and comparisons, and to prove that wide color gamut films can improve the color gamut performance of various traditional light sources.

For the wide color gamut film proposed in this disclosure, the light source module used can be, but not limited to, a backlight module composed of cathode ray tube (CCFL), light emitting diode (LED), organic light emitting diode (OLED) and other light sources, but It is best used for wide color gamut enhancement produced by using a cathode ray tube as a backlight source.

To sum up, the present invention is a wide color gamut film and its manufacturing method. The wide color gamut film is designed to match the application of a specific light source, especially a multilayer film made of a specific thickness and refractive index to filter a specific light band. Wide color gamut film, the wide color gamut film provided is different from the traditional way of using color filters to easily generate crosstalk. The solution proposed by the present invention can design optical elements that suppress the transmittance of specific light wavelength ranges , can effectively solve the known problem of crosstalk caused by color filters without changing the traditional display panel technology. The present invention also relates to a display device with a wide color gamut film and a method for making the wide color gamut film.

However, the above descriptions are only preferred feasible embodiments of the present invention, and therefore do not limit the patent scope of the present invention. Therefore, all equivalent structural changes made by using the description and illustrations of the present invention are equally included in the scope of the present invention. Within the scope of the claims, I agree to Chen Ming.

Claims (20)

1. a display device with wide colour gamut film, is characterized in that, described device comprises:

The panel module of one display device;

One backlight module, is located at a side of described panel module; And

Be located at the wide colour gamut film between described panel module and described backlight module, wherein said wide colour gamut film comprises the combination of the transparent membrane of the different refractivity that multilayer is adjacent, formation has according to an integral thickness of the light source pattern design of described backlight module and the film body of an overall refractive index, and described wide colour gamut film is in order to the penetrance of the spectral one or more optical bands of the back of the body that weaken or filter described backlight module and send;

Wherein, the film body that has described integral thickness and a described overall refractive index is for improving the crosstalk problem between a plurality of wave band color of light of luminous frequency spectrum of described backlight module.

2. the display device with wide colour gamut film according to claim 1, is characterized in that, described panel module is the panel module that is applied to a liquid crystal indicator, and the primary structure of wherein said panel module comprises:

One liquid crystal layer;

Be located at the electro-conductive glass of the both sides of described liquid crystal layer;

Be located at the both sides alignment film between described electro-conductive glass and described liquid crystal layer; And

Mutually perpendicular one first polaroid in polarization direction and one second polaroid, be located at described electro-conductive glass and the consitutional outside of alignment film, described both sides of the both sides of described liquid crystal layer, described liquid crystal layer.

3. the display device with wide colour gamut film according to claim 2, is characterized in that, described wide colour gamut film is arranged between described the second polaroid and described backlight module.

4. the display device with wide colour gamut film according to claim 3, is characterized in that, described wide colour gamut film is combined by a mechanical means between described backlight module.

5. the display device with wide colour gamut film according to claim 3, is characterized in that, between described wide colour gamut film and described backlight module, by a pressure-sensing glue, fits.

6. the display device with wide colour gamut film according to claim 3, is characterized in that, described wide colour gamut film adopts the mode of heat curing or ultraviolet cured adhesive to be combined between described backlight module.

7. the display device with wide colour gamut film according to claim 1, is characterized in that, described a plurality of wave band color of light comprise the optical band of a red light, a green light and a blue light.

8. the display device with wide colour gamut film according to claim 1, it is characterized in that, the light source arranging in described backlight module is the light source that a cold cathode ray tube, has trichromatic light emitting diode, the white light source or that is in harmonious proportion once light emitting diode has OLED.

9. the display device with wide colour gamut film according to claim 1, is characterized in that, the surface of described wide colour gamut film has microstructure.

10. one kind wide colour gamut film, be located between panel module and backlight module, it is characterized in that, the transparent membrane that described wide colour gamut film is the different refractivity that multilayer is adjacent combines, there is an integral thickness and an overall refractive index, in order to weaken or to filter the penetrance of the spectral one or more optical bands of the back of the body that described backlight module sends.

11. wide colour gamut films according to claim 10, is characterized in that, the transparent membrane of the different refractivity that described multilayer is adjacent comprises the first film and second film of the different refractivity that multilayer is superimposed with each other.

12. wide colour gamut films according to claim 10, is characterized in that, the surface of described wide colour gamut film has at least one microstructure.

13. wide colour gamut films according to claim 10, is characterized in that, described wide colour gamut film is the film with single shaft or twin shaft extension.

14. wide colour gamut films according to claim 13, is characterized in that, the polarisation effect of described wide colour gamut film can make described wide colour gamut film form an absorption or reflective Polarizer.

15. wide colour gamut films according to claim 10, is characterized in that, the penetrance of spectrum at least one wavelength band that penetrate of described wide colour gamut film is less than 70%, 50% or 30%.

16. wide colour gamut films according to claim 15, is characterized in that, described wide colour gamut film penetrate spectrum in the penetrance of surrounding's wave band of contiguous a red light, a green light and a blue light lower than 70%, 50% or 30%.

17. 1 kinds of methods of making wide colour gamut film, is characterized in that, described method comprises:

A plurality of optical bands of filtering according to wish, according to an integral thickness of described wide colour gamut film and an overall refractive index, purchase the transparent membrane of a plurality of different refractivities, wherein after confirming the backlight pattern of described wide colour gamut film application, determine one or more optical bands that described wish is filtered, and determine described integral thickness and described overall refractive index;

Film according to the described integral thickness of determining in conjunction with a plurality of adjacent different refractivities;

And

Formation has the wide colour gamut film of described integral thickness and described overall refractive index.

The method of the wide colour gamut film of 18. making according to claim 17, is characterized in that, the transparent membrane of described a plurality of different refractivities comprises the film of at least two different refractivities.

The method of the wide colour gamut film of 19. making according to claim 17, it is characterized in that, in the film step of a plurality of adjacent different refractivities described in described combination, also by a single shaft or the stretching step of a twin shaft, make described wide colour gamut film there is polarisation or do not there is the effect of polarisation.

The method of the wide colour gamut film of 20. making according to claim 17, is characterized in that, after the film step of a plurality of adjacent different refractivities described in described combination, on described wide colour gamut film, also attaches a reflecting polarized wafer.

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