CN102736390B - Black projection screen - Google Patents

Abstract

The present invention relates to the technical field of projection display, in particular to a black projection screen, which comprises: an optical film, the optical film has a first surface and a second surface opposite to each other, and is used to reflect the primary color light in the projected light Light in the wavelength range and light in other wavelength ranges; a black light-absorbing layer, the black light-absorbing layer is arranged on the second surface for absorbing the light incident on it; wherein, the optical films are made of different Multi-layer reflective film is formed; By the above method, the black projection screen of the present invention, by setting the black light-absorbing layer on the optical film, makes the light of the primary color light wavelength range in the projection light incident on the black projection screen almost completely reflected, Most of the natural light incident on the black projection screen is absorbed, which can effectively improve the imaging contrast and color reproduction of the black projection screen.

Description

black projection screen

technical field

The invention relates to the technical field of projection display, in particular to a black projection screen.

Background technique

Due to the influence of stray light formed by the reflection of ambient light on the black projection screen, the contrast and color reproduction of the projection light imaging on the existing black projection screen are greatly reduced, which affects the image projection effect, making it especially difficult for ambient light Projection projectors, projection movie machines, and projection televisions with high requirements can usually only be used under weak ambient light conditions, which limits the range of use of these projection devices.

Therefore, it is necessary to provide a black projection screen to solve the above technical problems.

Contents of the invention

The present invention provides a black projection screen, wherein the black projection screen can make the light in the wavelength range of the primary color light in the projection light incident on it be almost totally reflected, and the natural light incident on the black projection screen Most of the light is absorbed, which can effectively improve the contrast and color reproduction of black projection screen imaging.

In order to solve the above-mentioned technical problems, a technical solution adopted by the present invention is to provide a black projection screen, comprising: an optical film, the optical film has a first surface and a second surface opposite to each other, and is used to reflect the primary color light in the projection light Light in the wavelength range and light in other wavelength ranges; a black light-absorbing layer, the black light-absorbing layer is arranged on the second surface for absorbing the light incident on it; wherein, the optical films are made of different A multilayer reflective film is formed; the multilayer reflective film includes: a red reflective film that reflects red light, a green reflective film that reflects green light, and a blue reflective film that reflects blue light; the multilayer reflective film further includes : Yellow light reflective film that reflects yellow light, blue light reflective film that reflects blue light.

Wherein, the black projection screen further includes: a transparent substrate disposed on the first surface of the optical film, and the transparent substrate transmits light incident thereon.

Wherein, the multi-layer reflective films are attached to each other.

Wherein, the multi-layer reflective film is sequentially plated on the black light-absorbing layer.

Wherein, the multi-layer reflective film is sequentially plated on the transparent substrate.

In the black projection screen provided by the present invention, a black light-absorbing layer is arranged on the optical film, so that among the projection rays incident on the black projection screen, the light in the wavelength range of the primary color light is almost totally reflected, and is incident on the black projection screen. Most of the natural light on the screen is absorbed, which effectively improves the imaging contrast and color reproduction of the black projection screen, thereby expanding the use range of the black projection screen.

Description of drawings

Fig. 1 is the structural representation of the first embodiment of the black projection screen of the present invention;

Fig. 2 is a schematic diagram of a structure of the optical film 11 in Fig. 1;

3 and 4 are schematic diagrams of the projection principle of the black projection screen 10 shown in FIG. 1 comprising the optical film 11 shown in FIG. 2;

Fig. 5 is a schematic structural diagram of the second embodiment of the black projection screen of the present invention.

Detailed ways

Please refer to FIG. 1 . FIG. 1 is a schematic structural diagram of a first embodiment of the black projection screen of the present invention. As shown in FIG. 1 , the black projection screen 10 of this embodiment includes an optical film 11 and a black light-absorbing layer 12 . The optical film 11 has opposite first and second surfaces, wherein the first surface faces the incident direction of the projected light. The optical film 11 is used to reflect light in the primary wavelength range and transmit light in other wavelength ranges in the projected light, and the optical film 11 is formed of different multi-layer reflective films. The black light-absorbing layer 12 is disposed on the second surface of the optical film 11 , and the black light-absorbing layer 12 is used for absorbing incident light thereon.

In the first embodiment of the present invention, the multi-layer reflective films may be attached to each other, or may be sequentially plated on the black light-absorbing layer 12 . Of course, in other embodiments of the present invention, the multi-layer reflective film may also have other arrangements, which is not limited in the present invention.

Please refer to FIG. 2 , which is a schematic diagram of a structure of the optical film 11 in FIG. 1 . As shown in FIG. 2 , the optical film 11 includes a first reflective film (not marked), a second reflective film (not marked) and a third reflective film (not marked). Wherein, viewed along the incident direction of the projection light, the first reflective film is a red reflective film 111 , the second reflective film is a green reflective film 112 and the third reflective film is a blue reflective film 113 . Of course, viewed along the incident direction of the projection light, the first reflective film, the second reflective film and the third reflective film can also be red reflective film, green reflective film and blue reflective film in addition to the red, green and blue (RGB) mode Any combination of modes, such as red-blue-green (RBG) mode and blue-red-green (BRG) mode, which will not be repeated one by one.

The optical film 11 in the first embodiment of the present invention may further include a fourth reflective film (not shown), and the fourth reflective film is a yellow light reflective film (not shown). Correspondingly, viewed along the incident direction of the projection light, the combination mode of the first reflective film, the second reflective film, the third reflective film and the fourth luminescent film is red reflective film 111, green reflective film 112, blue reflective film Any combination pattern of the film 113 and the yellow light reflective film, such as red-green-blue-yellow (RGBY) pattern and red-yellow-blue-green (RYBG) pattern.

The optical film 11 in the first embodiment of the present invention may further include a fourth reflective film (not shown) and a fifth reflective film (not shown), wherein the fourth reflective film is a yellow reflective film, and the fifth The reflective film is a blue light reflective film. Correspondingly, viewed along the incident direction of the projection light, the combination mode of the first reflective film, the second reflective film, the third reflective film, the fourth light-emitting film and the fifth reflective film is red light reflective film 111, green light reflective film Any combination mode of film 112, blue light reflective film 113, yellow light reflective film and cyan light reflective film, such as red green blue yellow cyan (RGBYC) mode and green red yellow cyan blue (GRYCB) mode.

In an embodiment of the present invention, the red reflective film is used to reflect red light, the green reflective film is used to reflect green light, the blue reflective film is used to reflect blue light, the yellow reflective film is used to reflect yellow light, and the blue reflective film is used to reflect yellow light. Reflective film is used to reflect cyan light.

In the first embodiment of the present invention, the final color pattern formed by the projection light is determined by the combination of the primary color light of a specific wavelength. The primary color light, which in turn determines the color pattern of the projected light. After the projected light and natural light are incident on the black projection screen 10, the optical film 11 selectively reflects the light in the primary color wavelength range and transmits the light in other wavelength ranges in the projected light, wherein the light transmitted through the optical film 11 is absorbed by the black Layer 12 absorbs.

Please refer to FIG. 3 and FIG. 4 . FIG. 3 and FIG. 4 are schematic diagrams of the projection principle of the black projection screen 10 shown in FIG. 1 including the optical film 11 shown in FIG. 2 .

For example, the projection light incident on the black projection screen 30 is a colored light formed by mixing the three primary color lights of red light, green light and blue light. As shown in Figure 3, after the projection light is incident on the optical film 11, the red light in a specific wavelength range is almost completely reflected by the red reflective film, and the light in other wavelengths enters the next layer of reflective film; the green light in a specific wavelength range is reflected by the green light The reflective film is almost completely reflected, and the remaining blue light of a specific wavelength is almost completely reflected by the blue reflective film. Therefore, the projection light incident on the black projection screen 10 is almost totally reflected by the RGB reflective film.

In practical application: the red light reflective film only has a reflectivity of more than 95% for red light in a specific wavelength range (such as red light with a wavelength range of 635nm±10nm) in the projected light, while the transmission of light in other wavelength ranges The green light reflective film only has a reflectivity of more than 95% for green light in a specific wavelength range (such as green light with a wavelength range of 540nm±10nm) in the projected light, while for other wavelength ranges. The transmittance reaches over 95%; the blue light reflective film only has a reflectivity of over 95% for blue light of a specific wavelength in the projected light (such as blue light with a wavelength range of 435nm±10nm), while for other wavelengths, the reflectivity is as high as 95%. The passing rate reaches more than 95%.

As shown in FIG. 4 , when projection light is incident on the optical film 11 , natural light (environmental light) is also incident on the black projection screen 10 . Among them, the natural light is composed of light with continuous wavelengths, and only a small part of the natural light has the same wavelength range as the primary color light in the projected light, so only a small part of the natural light is reflected by the black projection screen 10, and most of the natural light is reflected by the black projection screen 10. Part of the light is transmitted and then absorbed by the black light absorbing layer 12 .

3 and 4, the black projection screen 10 shown in FIG. 1 comprising the optical film 11 of the structure shown in FIG. The imaging contrast, color reproduction and projection viewing effect can further expand the application range of the black projection screen of the present invention.

Certainly, the projection principle of the black projection screen 10 including the optical film 11 of other structures of the present invention is similar to that shown in FIG. 3 and FIG. 4 , and will not be repeated here.

Please refer to FIG. 5 , which is a schematic structural diagram of a second embodiment of the black projection screen of the present invention. As shown in FIG. 5 , the difference between the black projection screen 20 of this embodiment and the black projection screen 10 in the first embodiment is that the black projection screen 20 further includes a transparent substrate 23, wherein the transparent substrate 23 is arranged on the optical film 21 On the first surface of the transparent substrate 23, the light incident thereon is transmitted.

In the second embodiment of the present invention, multi-layer reflective films may be sequentially deposited on the transparent substrate 23 . Wherein, the transparent substrate 23 may be a flexible transparent substrate, or a rigid transparent substrate, such as a glass substrate.

Through the above-mentioned method, a kind of black projection screen that the present invention provides, by arranging black light-absorbing layer on the optical film, make the light in the wavelength range of primary color light in the projection light incident on the black projection screen be almost totally reflected, and incident on the black projection screen Most of the natural light on the black projection screen is absorbed, which effectively improves the imaging contrast and color reproduction of the black projection screen, thereby expanding the use range of the black projection screen.

The above is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related technologies fields, all of which are equally included in the scope of patent protection of the present invention.

Claims (5)

1. a black projection screen, is characterized in that, described black projection screen comprises:

Optical thin film, described optical thin film has relative first surface and second surface, and described optical thin film is for the light of primary lights wavelength coverage and the light of other wavelength coverage of transmission of reflective projection light;

Black light-absorbing layer, described black light-absorbing layer is arranged on described second surface, for being absorbed into the light being mapped on it;

Wherein, described optical thin film is formed by the reflective multilayer film differing from one another;

Described reflective multilayer film comprises: the blue light reflective membrane of the ruddiness reflective membrane of reflection Red light, the green glow reflective membrane of reflection green light and reflection blue light;

Described reflective multilayer film further comprises: reflect the gold-tinted reflective membrane of yellow light, the green light reflective membrane of reflection cyan ray.

2. black projection screen according to claim 1, is characterized in that, described black projection screen further comprises: transparency carrier, be arranged on the first surface of described optical thin film, and described transparency carrier is transmitted into the light being mapped on it.

3. according to the black projection screen described in claim 1-2 any one, it is characterized in that the setting of fitting each other of described reflective multilayer film.

4. according to the black projection screen described in claim 1-2 any one, it is characterized in that, described reflective multilayer film plates to be successively located on described black light-absorbing layer.

5. black projection screen according to claim 2, is characterized in that, described reflective multilayer film plates to be successively located on described transparency carrier.

Images