Patent Application
20180196188
Embodiments of the present disclosure relate to the field of display technologies, and more particularly, to a backlight module and a fabricating method thereof, and a two-sided display device.
With diversification of display requirements, in addition to traditional one-sided display, it is necessary to provide a display device having other display modes, for example, a display device capable of simultaneously displaying on two sides.
In a two-sided liquid crystal display device in the prior art, two liquid crystal display devices are simply superposed back to back, and either liquid crystal display device includes a backlight module and a liquid crystal display panel.
As shown in
Embodiments of the present disclosure provide a backlight module and a fabricating method thereof, and a two-sided display device, which are configured to improve the efficiency of light energy utilization of a backlight module.
According to a first aspect of the embodiments of the present disclosure, there is provided a backlight module, including:
a first transflective unit, a second transflective unit, and a bidirectional backlight source disposed between the first transflective unit and the second transflective unit, wherein the bidirectional backlight source is configured to emit light both in a direction toward the first transflective unit and in a direction toward the second transflective unit, and is configured to transmit light from the direction of the first transflective unit and light from the direction of the second transflective unit; the first transflective unit is configured to transmit light in a first polarization direction and reflect light in a second polarization direction; the second transflective unit is configured to transmit light in the second polarization direction and reflect light in the first polarization direction; and the first polarization direction is perpendicular to the second polarization direction.
In one embodiment, the bidirectional backlight source includes a light guide plate and a light source disposed at a side edge of the light guide plate.
In one embodiment, at least one of the first transflective unit and the second transflective unit includes a transflective film, a transflective lens, or an oblique plate stack superposed by glass.
In one embodiment, the backlight module further includes a depolarizing film disposed between the first transflective unit and the second transflective unit.
In one embodiment, the depolarizing film is disposed between the bidirectional backlight source and the first transflective unit and is configured to depolarize light in the second polarization direction to be light in the first polarization direction and light in the second polarization direction, and to at least transmit light in the first polarization direction.
In one embodiment, the depolarizing film is disposed between the bidirectional backlight source and the second transflective unit and is configured to depolarize light in the first polarization direction to be light in the first polarization direction and light in the second polarization direction, and to at least transmit light in the second polarization direction.
In one embodiment, the backlight module further includes at least one of a first polarizer and a second polarizer, wherein the first polarizer is disposed at a side of the first transflective unit opposite the bidirectional backlight source and is configured to transmit light in the first polarization direction and filter out light in the second polarization direction; and the second polarizer is disposed at a side of the second transflective unit opposite the bidirectional backlight source and is configured to transmit light in the second polarization direction and filter out light in the first polarization direction.
In one embodiment, light in the first polarization direction is one of p light and s light, and light in the second polarization direction is the other one of p light and s light.
According to a second aspect of the embodiment of the present disclosure, there is provided a method for fabricating a backlight module, including:
providing a first transflective unit, a second transflective unit and a bidirectional backlight source; and
disposing the bidirectional backlight source between the first transflective unit and the second transflective unit, where the bidirectional backlight source is configured to emit light both in a direction toward the first transflective unit and in a direction toward the second transflective unit, and is configured to transmit light from the direction of the first transflective unit and light from the direction of the second transflective unit; the first transflective unit is configured to transmit light in a first polarization direction and reflect light in a second polarization direction; the second transflective unit is configured to transmit light in the second polarization direction and reflect light in the first polarization direction; and the first polarization direction is perpendicular to the second polarization direction.
In one embodiment, the step of disposing the bidirectional backlight source between the first transflective unit and the second transflective unit includes:
attaching the first transflective unit and the second transflective unit on two opposite surfaces of the bidirectional backlight source, respectively.
According to a third aspect of the embodiments of the present disclosure, there is provided another backlight module, including:
a first reflective brightness enhancement unit, a second reflective brightness enhancement unit, and a bidirectional backlight source disposed between the first reflective brightness enhancement unit and the second reflective brightness enhancement unit, where the bidirectional backlight source is configured to emit light both in a direction toward the first reflective brightness enhancement unit and in a direction toward the second reflective brightness enhancement unit, and is configured to transmit light from the direction of the first reflective brightness enhancement unit and light from the direction of the second reflective brightness enhancement unit; both the first reflective brightness enhancement unit and the second reflective brightness enhancement unit are configured to transmit light in a first polarization direction, depolarize light in a second polarization direction to be light in the first polarization direction and light in the second polarization direction, then reflect both the depolarized light in the first polarization direction and the depolarized light in the second polarization direction back to the bidirectional backlight source; and the first polarization direction is perpendicular to the second polarization direction.
In one embodiment, the bidirectional backlight source includes a light guide plate and a light source disposed at a side edge of the light guide plate.
In one embodiment, the first reflective brightness enhancement unit includes a first transflective unit and a first depolarizing film disposed between the first transflective unit and the bidirectional backlight source; and/or
the second reflective brightness enhancement unit includes a second transflective unit and a second depolarizing film disposed between the second transflective unit and the bidirectional backlight source.
In one embodiment, the backlight module further includes a first polarizer and a second polarizer, where the first polarizer is disposed at a side of the first reflective brightness enhancement unit opposite the bidirectional backlight source; the second polarizer is disposed at a side of the second reflective brightness enhancement unit opposite the bidirectional backlight source; and both the first polarizer and the second polarizer are configured to transmit light in the first polarization direction and filter out light in the second polarization direction.
In one embodiment, light in the first polarization direction is one of p light and s light, and light in the second polarization direction is the other one of p light and s light.
According to a fourth aspect of the embodiments of the present disclosure, there is provided another method for fabricating a backlight module, including:
providing a first reflective brightness enhancement unit, a second reflective brightness enhancement unit and a bidirectional backlight source; and
disposing the bidirectional backlight source between the first reflective brightness enhancement unit and the second reflective brightness enhancement unit, where the bidirectional backlight source is configured to emit light both in a direction toward the first reflective brightness enhancement unit and in a direction toward the second reflective brightness enhancement unit, and is configured to transmit light from the direction of the first reflective brightness enhancement unit and light from the direction of the second reflective brightness enhancement unit; both the first reflective brightness enhancement unit and the second reflective brightness enhancement unit are configured to transmit light in a first polarization direction, depolarize light in a second polarization direction to be light in the first polarization direction and light in the second polarization direction, then reflect both the depolarized light in the first polarization direction and the depolarized light in the second polarization direction back to the bidirectional backlight source; and the first polarization direction is perpendicular to the second polarization direction.
According to a fifth aspect of the embodiments of the present disclosure, there is further provided a two-sided display device, including: a first display panel, a second display panel, and a backlight module disposed between the first display panel and the second display panel, where the backlight module is the backlight module according to the foregoing first aspect or the foregoing third aspect.
The backlight modules provided by the embodiments of the present disclosure enable components of light in two mutually perpendicular polarization directions to be fully utilized by different display panels, or converts unavailable polarized light in a particular polarization direction to available polarized light in another polarization direction, so that the two-sided display device using any of the backlight modules provided by the embodiments of the present disclosure has higher efficiency of light energy utilization.
To more clearly describe the embodiments of the present disclosure, the following will briefly introduce the accompanying drawings required for describing the embodiments.
To make the present disclosure clearer, the following clearly and completely describes embodiments of the present disclosure with reference to the accompanying drawings. It should be apparent that the described embodiments are some but not all of the embodiments of the present disclosure. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts shall fall within the protection scope of the present disclosure.
According to an embodiment of the present disclosure, there is provided a backlight module. As shown in
As an example, an operating principle of the foregoing backlight module provided by the embodiments of the present disclosure will be explained with reference to
Referring to
According to the backlight module provided by the embodiments of the present disclosure, both s light and p light are fully utilized, instead of filtering out the light polarized in one direction. Therefore, the efficiency of light energy utilization may be significantly improved for the bidirectional backlight source 101.
As shown in
As shown in
Due to reasons of fabricating technologies, the first transflective unit 103 likely cannot completely reflect s light but transmits a little s light, and correspondingly a little p light may likely transmit through the second transflective unit 104, which may have a negative effect on the display effect of the liquid crystal display panels. In the embodiments of the present disclosure, by respectively disposing a first polarizer 105 and a second polarizer 106 above the first transflective unit 103 and beneath the second transflective unit 104, respectively, a potential is reduced that s light transmitted upwards through the first transflective unit 103 has a negative effect on display of the liquid crystal display panel above and that p light transmitted downwards through the second transflective unit 103 has a negative effect on display of the liquid crystal display panel beneath. Of course it is understood that in practical application, the first polarizer and the second polarizer as mentioned above may also be not provided when the transflective units are good enough in performance or the negative effect on the display effect for the above reasons can be avoided in other ways.
In a specific embodiment, as shown in
In a specific embodiment, also a depolarizing film may be disposed between the first transflective unit 103 and the second transflective unit 104. The depolarizing film may be disposed between the light guide plate 101a and the first transflective unit 103 and is configured to depolarize s light to be one half of s light and one half of p light and transmit the p light thereof. The depolarizing film also may be disposed between the second transflective unit 104 and the light guide plate 101a and is configured to depolarize p light to be one half of s light and one half of p light and transmit the s light thereof. Also, in another embodiment, between the light guide plate 101a and the first transflective unit 103 as well as between the second transflective unit 104 and the light guide plate 101a, there is respectively provided a depolarizing film. It is readily understood that without regard to whether the depolarizing film is configured to depolarize s light or p light, and without regard to the location at which the depolarizing film is disposed between the first transflective unit 103 and the second transflective unit 104, in the corresponding backlight module provided by this embodiment, p light may exit only through the first transflective unit 103, s light may exit only through the second transflective unit 104, and light that cannot exit through the first transflective unit 103 or the second transflective unit 104 is finally reflected or depolarized to be light that can be emitted.
In another aspect, the embodiments of the present disclosure further provide a method for fabricating the backlight modules in
providing a first transflective unit, a second transflective unit and a bidirectional backlight source; and
disposing the bidirectional backlight source between the first transflective unit and the second transflective unit, wherein the bidirectional backlight source is configured to emit light both in a direction toward the first transflective unit and in a direction toward the second transflective unit, and is configured to transmit light from the direction of the first transflective unit and light from the direction of the second transflective unit; the first transflective unit is configured to transmit light in a first polarization direction and reflect light in a second polarization direction; the second transflective unit is configured to transmit light in the second polarization direction and reflect light in the first polarization direction; and the first polarization direction is perpendicular to the second polarization direction.
In a specific embodiment, the first transflective unit and the second transflective unit may be respectively attached on an upper surface and a lower surface of the bidirectional backlight source, or through a backplate having a particular structure, the first transflective unit and the second transflective unit are respectively disposed above and beneath the bidirectional backlight source.
Embodiments of the present disclosure further provide another backlight module. Referring to
In addition, like the embodiment as shown in
Likewise, the operating principle of another backlight module provided by the embodiments of the present disclosure is explained with reference to
The structure of the bidirectional backlight source in this embodiment may be consistent with that of the bidirectional backlight source in the foregoing embodiments, and thus is not described in detail herein.
In a specific embodiment, the first reflective brightness enhancement unit 107 herein may include a first transflective unit and a first depolarizing film disposed between the first transflective unit and the bidirectional backlight source. Correspondingly, the second reflective brightness enhancement unit 108 may also include a second transflective unit and a second depolarizing film disposed between the second transflective unit and the bidirectional backlight source. Of course in other embodiments, also other structures having corresponding functions may be adopted for the first reflective brightness enhancement unit and/or the second reflective brightness enhancement unit herein.
Likewise, in the embodiments of the present disclosure, the two disposed polarizers 109 and 110 also can play a role in preventing leaked s light from having a negative effect on the display effect of the display panels.
It should be noted that although in the foregoing embodiments it is explained by taking the first polarized light as p light and the second polarized light as s light, it is understood that the same technical effect can be achieved when the first polarized light is s light and the second polarized light is p light, and corresponding embodiments shall fall within the scope of protection of the present disclosure.
In another aspect, the embodiments of the present disclosure further provide a method for fabricating the backlight modules in
providing a first reflective brightness enhancement unit, a second reflective brightness enhancement unit and a bidirectional backlight source; and
disposing the bidirectional backlight source between the first reflective brightness enhancement unit and the second reflective brightness enhancement unit, wherein the bidirectional backlight source is configured to emit light both in a direction toward the first reflective brightness enhancement unit and in a direction toward the second reflective brightness enhancement unit, and is configured to transmit light from the direction of the first reflective brightness enhancement unit and light from the direction of the second reflective brightness enhancement unit; both the first reflective brightness enhancement unit and the second reflective brightness enhancement unit are configured to transmit light in a first polarization direction, depolarize light in a second polarization direction to be light in the first polarization direction and light in the second polarization direction, and then reflect the light in the first polarization direction and the light in the second polarization direction back to the bidirectional backlight source; and the first polarization direction is perpendicular to the second polarization direction.
In a specific embodiment, the first reflective brightness enhancement unit and the second reflective brightness enhancement unit may be respectively attached on the upper surface and the lower surface of the bidirectional backlight source, or through a backplate having a particular structure, the first reflective brightness enhancement unit and the second reflective brightness enhancement unit are respectively disposed above and beneath the bidirectional backlight source.
In still another aspect, the embodiments of the present disclosure further provide a two-sided display device, and the two-sided display device includes: a first display panel, a second display panel, and a backlight module disposed between the first display panel and the second display panel, wherein the backlight module herein is the backlight module in any one of the foregoing embodiments.
The two-sided display device herein may be any product having the display function, such as a mobile phone, a computer, a PAD, a palm computer, an e-book and so on.
It should be explained that the orientation or position relations represented by the terms of “up”, “above”, “down”, “beneath”, “top”, “bottom”, “between” and the like used in the description of the present disclosure are relative orientation or position relations shown based on the accompanying figures, and are merely for ease of a description of the present disclosure and a simplified description instead of being intended to indicate or imply the device or element to have a special orientation or to be configured and operated in a special orientation. Thus, they cannot be understood as limiting of the present disclosure. In addition, when an element or layer is referred to as being “on” another element or layer, it may be directly on the other element or layer, or intervening elements or layers may be present. Likewise, when an element or layer is referred to as being “beneath” another element or layer, it may be directly beneath the other element or layer, or at least one intervening element or layer may be present. When an element or layer is referred to as being “between” two elements or two layers, it may be unique element or layer between the two elements or two layers, or at least one intervening element or layer may be present.
In addition, when an element and an embodiment thereof in this application are introduced, articles “a” “an”, “the” and “said” may be intended to indicate one or more elements are present. Unless otherwise stated, “multiple” means two or more than two. The terms “comprise”, “include”, “contain” and “have” are inclusive and therefore specify the presence of other elements excluding the elements listed out. The terms “first”, “second”, “third” and so on are merely for description purposes, and are not construed as indicating or implying relative importance.
The abovementioned embodiments are merely the specific embodiments of the present disclosure, and the scope of protection of the present disclosure is not limited to this. Any variation or substitution easily conceivable to a person of skilled in the art within the technical scope disclosed in the present disclosure shall fall within the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure shall be subject to the scope of protection of the claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201510446791.5 | Jul 2015 | CN | national |
This application is a National Stage Entry of PCT/CN2016/070234, filed Jan. 6, 2016, which claims the benefit and priority of Chinese Patent Application No. 201510446791.5 filed Jul. 27, 2015. The entire disclosure of each of the above applications are incorporated herein by reference.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2016/070234 | 1/6/2016 | WO | 00 |
