JP3212898U - Optical film, backlight module, and display device - Google Patents

Abstract

An optical film, a backlight module, and a display device having a uniform luminance and a high light utilization rate are provided. An optical film 111 is located on at least one main surface, a plurality of sides located around the main surface, and any two adjacent sides, each having a chamfered surface. The optical film includes a plurality of chamfered portions 1113 and a plurality of microstructures 1115 formed on the chamfered surface of the chamfered portion, and the optical film is provided with the chamfered portions and the microstructures so that corners or edges of the backlight module are provided. Avoiding the occurrence of dark bands at the same time, making the brightness of the backlight module more uniform and providing a high light utilization rate. [Selection] Figure 1

Description

  The present invention relates to an optical film, a backlight module, and a display device, and more particularly to an optical film, a backlight module, and a display device that can improve luminance at corners.

  A liquid crystal display (LCD) is thin and light, and has a characteristic that the image quality is beautiful. Therefore, the liquid crystal display (CRT) is already widely used instead of a conventional cathode ray tube (CRT) display. The backlight module is a very important light emitting structure in the liquid crystal display, mainly by controlling the light source provided from the backlight module and appropriately controlling the switch member according to the liquid crystal of the liquid crystal panel, The brightness and image quality of the display screen of the liquid crystal display are determined. In addition, since the light emitting diode has advantages such as low power consumption, small volume, and high brightness, it is already widely used as a light source for a backlight module instead of a conventional fluorescent lamp.

  The backlight module is one of important members of the display device. The light beam emitted from the light source is adjusted in the distribution of the light beam through the optical film member in the backlight module, and directly affects the display effect (for example, display brightness and image quality). Taking an example of a direct type backlight module that employs a light emitting diode (LED) as a light source, a light beam regarded as a point light source is generated from the light emitting diode, and the light beam is guided to a surface light source through an optical film member. Is output to the liquid crystal panel, thereby providing a light beam necessary for the display device.

  However, since the light rays that can be obtained at the corners and edges of the display area are limited compared to the light rays from the light source in each direction at the center portion of the display area, the conventional display device has a Dark bands or uneven brightness tends to occur at corners or edges.

  If the corners or edges of the direct-type backlight module structure are provided with light sources (LEDs) that are particularly densely packed, the complexity and cost of the structure of the light-emitting diode array (LED) are clearly increased and expected. It is difficult to control the effect of uniforming light rays.

  In order to solve the above problem, it has been proposed to increase the luminance at the corners by adding reflective structures at the four corners of the backlight module of the conventional display device. However, such a method causes problems such as an increase in manufacturing cost.

  The inventor of the present invention has found the above-mentioned problems, has determined that further improvements need to be made to the direct type backlight module and the display device, and completed the present invention.

  The main purpose of the present invention is to avoid the occurrence of dark bands at the corners or edges of the backlight module, to make the backlight module more uniform in brightness, and to have a relatively high light utilization rate. (LED) It is providing the optical film which can reduce the usage-amount.

  Another object of the present invention is to provide an optical film capable of reducing the volume and material cost by forming a plurality of chamfered portions.

  In order to achieve the above object, an optical film provided by the present invention includes at least one main surface, a plurality of sides positioned around the main surface, and any two adjacent sides. And a plurality of chamfered portions each having a chamfered surface formed thereon and a plurality of microstructures formed on the chamfered surface of the chamfered portion.

  Preferably, a chamfer angle of 90 to 180 degrees is provided between the side of the optical film and the chamfered surface.

  Preferably, the chamfer angle is 135 degrees.

  Preferably, the microstructure has a pin-angle shape and is provided adjacently and extends in the same linear direction, and the linear direction is parallel to the main surface.

  Preferably, the microstructures are spaced apart and extend in the same linear direction, the linear direction being parallel to the major surface.

  Preferably, the microstructure is pin-shaped.

  Preferably, each said microstructure is a kerf.

  Preferably, the microstructure is non-pinned and is provided adjacent to and extends toward the same linear direction, and the linear direction is parallel to the main surface.

  Another object of the present invention is to provide a backlight module that avoids the occurrence of dark bands at corners or edges of the backlight module by providing the optical film.

  In order to achieve the above object, a backlight module provided by the present invention includes a light source and an optical film member for guiding a light beam generated by the light source, and the optical film member includes the optical film. Is provided.

  Preferably, the optical film member further includes at least one brightness enhancement film, at least one prism sheet, and at least one diffusion sheet, and the brightness enhancement film, the prism sheet, and the diffusion sheet are mutually connected. Overlapping is provided.

  Preferably, the optical film is a diffusion plate positioned above the light source.

  Another object of the present invention is to provide the optical film and the backlight module so as to avoid the occurrence of dark bands at the corners or edges of the backlight module and to provide a better light output effect. It is to provide a display device that makes the distribution of light rays close to the edge of a surface uniform.

  In order to achieve the above object, a display device provided by the present invention includes a display panel provided on a light exit surface of the backlight module.

  In the optical film, the backlight module, and the display device provided by the present invention, mainly when the light beam is guided and transmitted through the optical film, the optical film uses the microstructure of the chamfered surface to generate the light beam. Is scattered or diffused in the corner area of the backlight module, thereby avoiding the generation of dark bands at the corner or edge of the backlight module, providing a better light output effect, and the edge of the display surface Make the distribution of light rays close to the screen uniform and have excellent display quality.

1 is a perspective view of a preferred embodiment of the present invention. It is the elements on larger scale which show the microstructure of the optical film in the preferable Example of this invention. It is the elements on larger scale which show the other aspect of the microstructure of the optical film in another Example of this invention. It is the elements on larger scale which show the other aspect of the microstructure of the optical film in another Example of this invention. It is the elements on larger scale which show the other aspect of the microstructure of the optical film in another Example of this invention. FIG. 3 is an exploded perspective view illustrating a configuration of a backlight module according to a preferred embodiment of the present invention. It is a use condition schematic diagram which shows a state when the optical film of the backlight module in a preferable Example of this invention scatters. It is a use condition schematic diagram which shows a state when the optical film of the backlight module in a preferable Example of this invention scatters. 1 is an exploded perspective view illustrating a connection relationship between a backlight module and a display device according to a preferred embodiment of the present invention.

  1 and 2 are a perspective view and a partially enlarged perspective view showing an optical film according to a preferred embodiment of the present invention, in which an optical film 111 is described, and the optical film 111 is a diffusion plate 1111, and The optical film 111 has a rectangular shape, and includes at least one main surface 1110, a plurality of side edges 1112, and a plurality of chamfered portions 1113, and each side edge 1112 is positioned around the main surface 1110. The chamfered portion 1113 is positioned on any two adjacent side edges 1112, the chamfered portion 1113 is formed with a chamfered surface 1114, and a plurality of microstructures 1115 are formed on the chamfered surface 1114 of the chamfered portion 1113. Is formed. Further, a chamfering angle θ of 90 to 180 degrees is provided between the side edge 1112 of the optical film 111 and the chamfered surface 1114.

  In the present embodiment, the chamfering angle θ is 135 degrees as an embodiment, but the present invention is not limited thereto. In this embodiment, the microstructures 1115 are pin-shaped and are provided adjacent to each other and extend in the same linear direction, and the linear direction is parallel to the main surface 1110.

  3-5 is the elements on larger scale which show the other aspect of the microstructure 1115 of the optical film 111 in another Example of this invention. As shown in FIG. 3, the microstructures 1115 are pin-shaped and have a certain distance from each other, so that the microstructures 1115 are provided at intervals, and the microstructures 1115 extend in the same linear direction. . As shown in FIG. 4, each of the microstructures 1115 is in the form of a kerf, and the kerfs have a certain distance and are spaced from each other, and the microstructure 1115 has a linear direction. It is stretched toward. As shown in FIG. 5, the microstructure 1115 is non-pinned and provided adjacently, and the microstructure 1115 has an arc shape as an example, and the microstructure 1115 is also directed in the same linear direction. Stretched and the linear direction is parallel to the major surface 1110.

  FIG. 6 is an exploded perspective view showing an aspect of the structure of the backlight module 10 in a preferred embodiment of the present invention. In this embodiment, a backlight module 10 is described. The backlight module 10 includes an optical film member 11, at least one light source 12, and a housing 13. In the present embodiment, the present invention includes the light source 12. The light source 12 is provided inside the housing 13, and the light source 12 is a light emitting diode (LED) as an example, and the optical film member 11 includes at least one brightness enhancement film 114 and at least one prism. A sheet 113 and at least one diffusion sheet 112, the brightness enhancement film 114, the prism sheet 113, and the diffusion sheet 112 are provided to overlap the diffusion plate 1111, and the optical film member 11. Guides the light rays generated by the light source 12.

  In this embodiment, the diffusion plate 1111 of the optical film member 11 is the optical film 111 positioned above the light source 12, and the prism sheet 113 is interposed between the diffusion plate 1111 and the brightness enhancement film 114. The diffusion sheet 112 is sandwiched between the two.

  FIG. 9 is an exploded perspective view showing a connection relationship between the backlight module 10 and the display device 100 in a preferred embodiment of the present invention. The display device 100 is described therein, and the display device 100 includes a display panel 20, and the display panel 20 is provided on a light exit surface of the backlight module 10.

  In order to further understand the structural features of the present invention, the technical means employed, and the expected effects, the method of use of the present invention will be described so that the present invention can be understood more deeply and specifically.

  2, 7 and 8 are a partially enlarged view and a usage state schematic diagram in a preferred embodiment of the present invention. Since the microstructure 1115 may be one or a combination of the embodiments of FIGS. 2 to 5, when the light emitted from the light source 12 is guided and passes through the optical film 111, the microstructure 1115 can achieve the effect of emitting light and emitting light uniformly using the light sufficiently, the distribution of the light rays close to the corners of the housing 13 is relatively uniform, and the light output surface of the backlight module 10 A sharp decrease in luminance at the corners can be avoided. Specifically, the present invention mainly uses the microstructure 1115 of the chamfered surface 1114 to scatter or diffuse light rays to the corner area of the backlight module 10 to have a high light utilization rate. Thereby, the usage-amount of the light source 12 (LED) can be reduced.

  As can be seen from the description of the above structure, the present invention is provided with light sources 12 (LEDs) that are particularly densely arranged at corners or edges of the structure of the direct type backlight module 10 in the prior art. The complexity and cost of the structure of the light emitting diode array (LED) is obviously increased, and the problem of difficult to control the uniformity effect of the light beam can be surely solved.

  In the above embodiment, only the light emitting diode (LED) is taken as an example of the light source 12, but it is not limited to the light emitting diode, and various types of tubular light sources 12 can be selected. : Cold Cathode Fluorescent Lamp), Hot Cathode Fluorescent Lamp (HCFL) or External Electrode Fluorescent Lamp (EEFL) can be selected, all of which can achieve the object of the present invention Should be explained.

  Furthermore, it should be explained that the optical film 111 can reduce the cost and improve the profit because the chamfered portion 1113 is provided to make the optical film 111 thinner.

  Hereinafter, the features and expected effects of the present invention will be further described.

  The optical film 111, the backlight module 10, and the display device 100 of the present invention are mainly configured so that the optical film 111 has the chamfered surface 1114 when the light beam is guided through the optical film 111. 1115 is used to scatter or diffuse light rays into the corner area of the backlight module 10 to avoid the occurrence of dark bands at the corner or edge of the backlight module 10 and to provide a better light output effect. , Make the distribution of the light rays close to the edge of the display surface uniform and have excellent display quality.

  In addition, the present invention further utilizes the fact that the chamfered portion 1113 and the microstructure 1115 are formed on the optical film 111, thereby reducing the volume of the optical film 111 and reducing the cost of the material. It solves the problem that dark bands or uneven brightness tends to occur at the corners or edges of the display area of the conventional display apparatus 100, and is particularly concentrated at the corners or edges of the conventional direct type backlight module structure. The light source 12 (LED) is provided so that the complexity and cost of the structure of the light emitting diode array (LED) is obviously increased, and the expected uniform light effect is difficult to control. Is done.

  The above description is only a preferred and feasible embodiment of the present invention, and any equivalent structural changes made within the specification and patent scope of the present invention should be included in the patent scope of the present invention. .

100 display device,
10 Backlight module,
11 Optical film member,
111 optical film,
1110 main surface,
1111 diffuser plate,
1112 side,
1113 chamfered portion,
1114 chamfered surface,
1115 microstructure,
112 diffusion sheet,
113 prism sheet,
114 brightness enhancement film,
12 light sources,
13 Enclosure,
20 display panel,
θ Chamfer angle.

Claims (12)

At least one major surface;
A plurality of sides located around the at least one main surface;
A plurality of chamfered portions each positioned on any two adjacent sides, each having a chamfered surface;
A plurality of microstructures formed on the chamfered surface of the chamfered portion;
An optical film comprising:   2. The optical film according to claim 1, wherein the optical film has a chamfering angle of 90 to 180 degrees between a side of the optical film and the chamfered surface.   The optical film according to claim 2, wherein the chamfer angle is 135 degrees.   2. The microstructure according to claim 1, wherein the microstructure is pin-shaped and is provided adjacent to and extends toward the same linear direction, the linear direction being parallel to the at least one major surface. 4. The optical film according to any one of 3.   The microstructure according to any one of claims 1 to 3, wherein the microstructures are spaced apart and extend in the same linear direction, the linear direction being parallel to the at least one major surface. Optical film.   The optical film according to claim 5, wherein the microstructure has a pin-corner shape.   The optical film according to claim 5, wherein each of the microstructures is a kerf.   2. The microstructure according to claim 1, wherein the microstructure is non-pinned and is provided adjacently and extends in the same linear direction, the linear direction being parallel to the at least one major surface. The optical film in any one of -3. A light source;
An optical film member for guiding a light beam generated by the light source;
Including
The said optical film member has an optical film in any one of Claims 1-8, The backlight module characterized by the above-mentioned.   The optical film member further includes at least one brightness enhancement film, at least one prism sheet, and at least one diffusion sheet, and the brightness enhancement film, the prism sheet, and the diffusion sheet are provided to overlap each other. The backlight module according to claim 9, wherein the backlight module is provided.   The backlight module according to claim 9, wherein the optical film is a diffusing plate located above the light source. A display panel;
The backlight module according to any one of claims 9 to 11,
Including
The display device, wherein the display panel is provided on a light exit surface of the backlight module.