The present application claims the priority of Chinese Patent Application No. 201510717534.0 filed on Oct. 29, 2015, the disclosure of which is incorporated herein by reference.
The present disclosure relates to the field of display technology, in particular to an optical structure, a method for manufacturing the optical structure, a display substrate and a display device.
Liquid crystal display technology is the mainstream of flat panel display technology. Since the liquid crystal itself does not emit light, various liquid crystal display devices, such as liquid crystal displays (LCDs) and liquid crystal TVs, rely on an external backlight for display.
When a liquid crystal display device is used for outdoor display, in order to improve a display quality of the liquid crystal display device, it needs to further increase the brightness, so as to prevent the display from being affected by the external ambient light. In the related art, an optical element, such as a prism sheet or a brightness enhancement film, is used to increase the brightness of the liquid crystal display device. However, this will increase the thickness of the entire device, and thus cannot satisfy a demand for a thinner product. Moreover, when the optical element gets thinner, the reliability of the LCD device is adversely affected to a certain extent, and the total cost of the entire LCD device is increased.
The present disclosure provides an optical structure, so as to improve the brightness of the display device without increasing the thickness of the display module.
The present disclosure further provides a method for manufacturing the optical structure, and provides a display substrate and a display device including the above optical structure.
In one aspect, the present disclosure provides in some embodiments an optical structure. The optical structure includes at least two light-transmissible optical films. At least two adjacent light-transmissible optical films have different refractive indexes. When incident light enters into the two adjacent optical films with different refractive indexes, the light is refracted at a contact interface of the two adjacent optical film, so as to achieve the convergence of light.
The present disclosure further provides in some embodiments a display substrate. The display substrate includes the above-mentioned optical structure. The optical structure is arranged on the display substrate at a light-entering side.
The present disclosure further provides in some embodiments a display device, including the above-mentioned display substrate.
The above-described technical solutions of the present disclosure have the following advantages. In the above-described embodiment, the optical structure is provided with two adjacent optical films having different refractive indexes, and when incident light enters the two adjacent optical films, refraction occurs at the contact interface of the adjacent optical films. As a result, an angle between the refracted light and the light incident surface is greater than that between the incident light and the light incident surface, so as to realize the convergence of light. Since a thickness of the optical film is in a nanometer order, when the optical structure is applied to the display device, the display brightness can be increased without increasing the thickness of the display module.
In order to illustrate the technical solutions of the present disclosure in a clearer manner, the drawings desired for the present disclosure will be described hereinafter briefly. Obviously, the following drawings merely relate to some embodiments of the present disclosure, and based on these drawings, a person skilled in the art may obtain the other drawings without any creative effort.
The present disclosure provides an optical structure, which includes at least two light-transmissible optical films. At least two adjacent optical films of the at least two light-transmissible optical films have different refractive indexes. When incident light enters the two adjacent optical film having different refractive indexes, the light is refracted at a contact interface between the two adjacent optical films, such that an angle between the refracted light and an incident surface is larger than that between the incident light and the incident surface, so as to achieve the convergence of light and improve the brightness of light. Since a thickness of the optical film may be in a nanometer (nm) order, when the optical structure is applied to the display device, the display brightness can be increased without increasing the thickness of the display module. In addition, since the thin-film preparation technique has been matured, the production cost of the optical structure is low.
The optical structure may be, but not limited to, applied in liquid crystal display devices and organic light emitting diode display devices.
The present disclosure will be described hereinafter in further details in conjunction with the drawings and embodiments. The following embodiments are for illustrative purposes only, but shall not be used to limit the scope of the present disclosure.
Referring to
The optical structure 1 includes at least two light-transmissible optical films arranged one on another. At least two adjacent light-transmissible optical films, e.g. a first optical film 10 and a second optical film 20, have different refractive indexes. An incident surface through which incident light enters the two adjacent optical films having the different refractive indexes is referred to be a first incident surface A. When incident light enters the two adjacent optical films having the different refractive indexes, the light is refracted at a contact interface (B1 and B2 in
The optical film may be made of organic material, such as organic resin. In the drawings, only two adjacent optical films 10 and 20 having different refractive indexes are shown schematically to explain the principle of converging light according to the technical solution of the present disclosure. Other optical films stacked in layers are not shown. The dotted line in the drawing is the normal line of the contact interface between the first optical film 10 and the second optical film 20 which are adjacent to each other and have different refractive indexes. The direction of the straight line with an arrow is the propagation direction of the light.
It should be noted that, the two adjacent optical films refers to that the two optical films are arranged one on another and there is no other film arranged therebetween.
In order to facilitate the description of the technical solution of the present disclosure, the light incident surface in the embodiments of the present disclosure refers to an incident surface through which incident light enters the two adjacent optical films having different refractive indices; the refracted light refers to the light refracted by the two adjacent optical films having different refractive indices; and in the embodiments of the present disclosure, the angles are all acute angles.
In some embodiments of the present disclosure, the two adjacent optical films having different refractive indexes are the first optical film 10 and the second optical film 20, and the second optical film 20 is arranged proximate to the light-entering side.
In the practical application, the refractive indexes of the first optical film 10 and the second optical film 20 may be arranged according to a shape of a contact interface between the first optical film 10 and the second optical film 20, such that after the light is refracted by the second optical film 20 and the first optical film 10 (the light is refracted at the contact interface between the second optical film 20 and the first optical film 10), the angle between the refracted light and the first incident surface A is larger than the angle between the incident light and the first incident surface A, so as to achieve the convergence of light.
In some embodiments, as shown in
Further, as shown in
In some embodiments of the present disclosure, referring to
Specifically, projections of the first protrusion units on a first vertical plane form a broken line and the first vertical plane is perpendicular to the first incident surface A and parallel to the first direction X. As shown in
Obviously, the contact interface between the first optical film 10 and the second optical film 20 is not limited to only include two portions (i.e., first portions B1 and second portions B2). The contact interface may have any one of other structures. For example, a projection of the contact interface on the first vertical plane which is perpendicular to the first incident surface A may form a periodically repeated arc line, as shown in
When the contact interface between the first optical film 10 and the second optical film 20 is of a concavo-convex structure, the concavo-convex structure is not limited to be strip-like protrusions, but also may include a plurality of independent dot-like protrusions. Specifically, as shown in
In the above embodiments, the contact interface between the first optical film 10 and the second optical film 20 includes convex surfaces protruding toward the light-exiting side, that is, the contact interface between the first optical film 10 and the second optical film 20 is not in a plane.
In the practical application, as shown in
In some embodiments, the refractive indexes of all optical films of the optical structure 1 may be arranged in an ascending order or in a descending order in a light transmitting direction, such that the light can be refracted at each of contact interfaces between the adjacent optical films, so as to converge the light, as described above.
As shown in
As shown in
First, a base 100 is provided. As shown in
At this point, the optical structure 1 in some embodiments of the present disclosure is formed.
As shown in
Optionally, the optical structure 1 is arranged on the base of the display substrate 2; hence, a separate base for the optical structure is not needed and the thickness of the display substrate 2 is reduced.
Further, in order to ensure the optical characteristic of the optical structure, a protection layer 30 may be arranged on the second optical film 20, as shown in
When the display substrate 2 is an array substrate, the display substrate 2 may further include a display film 40 for displaying, as shown in
In the embodiments of the present disclosure, the display film 40 and the optical structure 1 may be arranged on two opposite sides of the base 100, respectively, to further reduce the thickness of the module. For a liquid crystal display device, the optical structure 1 is arranged proximate to the backlight module, such that light from the backlight module is converged by the optical structure first and then emitted from the display film 40 to achieve the displaying.
As shown in
The display device may specifically be any product or component having a display function, such as a display panel, an electronic paper, a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, or a navigator.
The above are merely the preferred embodiments of the present disclosure. A person skilled in the art may make further modifications and improvements without departing from the principle of the present disclosure, and these modifications and improvements shall also fall within the scope of the present disclosure.
Number | Date | Country | Kind |
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201510717534.0 | Oct 2015 | CN | national |
Filing Document | Filing Date | Country | Kind |
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PCT/CN2016/098058 | 9/5/2016 | WO | 00 |