BACKLIGHT MODULE
A backlight module includes a light source, a light guide plate and at least one optical film. The light source has a plurality of light emitting devices. The light guide plate includes a light entrance portion, a main body portion and at least one positioning structure. The light entrance portion has a top surface and a light entrance surface. The light source is disposed corresponding to the light entrance surface. The top surface is adjacently connected to the light entrance surface. The main body is connected to the light entrance portion and has a first light extraction surface connecting the top surface. The positioning structure is disposed on the top surface and corresponding to an interval between two adjacent light emitting devices, and has an accommodating space. The optical film is disposed above the light guide plate and has at least one protruding portion disposed in the accommodating space.
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The present invention relates to a backlight module, and more particularly to a backlight module having a positioning structure for optical films.
BACKGROUNDWhile electronic industry keeps developing, liquid crystal displays (LCDs) have become the mainstream of present market. Since the LCD panel is not a self-emitting device, a backlight module is needed to provide light to the LCD panel, thus achieving the purpose of image displaying.
According to some requirements coming from the market, the design trend of bezel for LCD module is towards narrower and the LCD module keeps enlarging its size and widening its viewing angle. Such requirements have to be taken into the consideration on designing of the components in the backlight module. For example, in order to install optical films to the backlight module, positioning structures (such as fixing corners) are disposed on the frame of the backlight module for fixing and positioning the optical films, and avoiding the displacement of the optical films which leads to downgrade of the optical performance.
However, the above mentioned fixing corners on the frame are usually located at two sides of the LCD module. When the backlight module is illuminating, shadows are formed by the fixing corners on the two sides of the screen of the LCD module. Such shadows directly affect the displaying quality of the LCD module.
SUMMARYThe present invention provides a backlight module including a light source, a light guide plate and at least one optical film. The light source has a plurality of light emitting devices. The light guide plate includes a light entrance portion, a main body portion and at least one positioning structure. The light entrance portion has a top surface and a light entrance surface. The light source is disposed corresponding to the light entrance surface. The top surface is adjacently connected to the light entrance surface. The main body portion is connected to the light entrance portion and has a first light extraction surface, and the first light extraction surface is connected to the top surface. The at least one positioning structure is disposed on the top surface of the light entrance portion. The positioning structure is disposed corresponding to an interval between two adjacent light emitting devices. The positioning structure has an accommodating space. The at least one optical film is disposed above the light guide plate. The optical film has at least one protruding portion disposed in the accommodating space.
The present invention will become more readily apparent to those ordinarily skilled in the art after reviewing the following detailed description and accompanying drawings, in which:
The present invention will now be described more specifically with reference to the following embodiments. It is to be noted that the following descriptions of preferred embodiments of this invention are presented herein for purpose of illustration and description only. It is not intended to be exhaustive or to be limited to the precise form disclosed.
Referring to
In this embodiment of the backlight module 1, since the positioning structure 112 is disposed corresponding to the interval between the two adjacent ones of the light emitting devices 100, the structure design has an advantage that the positioning structure 112 does not block the light emitted from the light emitting device 100, thus avoiding the shadows formed by the positioning structure 112 blocking the light emitted from the light emitting device 100.
Following the mentioned above, as
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In order to more clearly show the structure of every components of the backlight module 1 and the positioning relationship thereof in this embodiment, the structure of the backlight module 1 of this embodiment can be referred to a three dimensional view in
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In conclusion, the backlight module disclosed by the embodiments of the present invention, in which the light guide plate has at least one positioning structure. The positioning structure is disposed on the top surface of the light entrance portion of the light guide plate, and the positioning structure is disposed corresponding to the interval between two adjacent ones of the light emitting devices. Under this structural design, the protruding portions of the optical films can be directly disposed in the accommodating spaces of the positioning structures. There is no need to dispose a position structure on the frame for fixing the optical film. Moreover, since the positioning structure is disposed corresponding to the interval between two adjacent ones of the light emitting devices, the positioning structures do not block the light emitted from the light emitting devices. Therefore, the shadows formed by the positioning structure on the frame can be avoided, the function of the alignment in assembly can be remained and the displacement of the optical films can be avoided.
While the invention has been described in terms of what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention needs not be limited to the disclosed embodiment. On the contrary, it is intended to cover various modifications and similar arrangements included within the spirit and scope of the appended claims which are to be accorded with the broadest interpretation so as to encompass all such modifications and similar structures.
Claims
1. A backlight module, comprising:
- a light source having a plurality of light emitting devices;
- a light guide plate comprising: a light entrance portion having a top surface and a light entrance surface, wherein the light source is disposed corresponding to the light entrance surface, and the top surface is adjacently connected to the light entrance surface; a main body portion connected to the light entrance portion and having a first light extraction surface, the first light extraction surface being connected to the top surface; and at least one positioning structure disposed on the top surface of the light entrance portion, the positioning structure being disposed corresponding to an interval between two adjacent ones of the light emitting devices, the positioning structure having an accommodating space; and
- at least one optical film disposed above the light guide plate, the optical film having at least one protruding portion, the protruding portion being disposed in the accommodating space.
2. The backlight module according to claim 1, wherein the positioning structure further has a first surface, a second surface and a third surface, the second surface and the third surface respectively extend from two sides of the first surface and along the direction toward the main body portion, and the first surface, the second surface and the third surface define the accommodating space.
3. The backlight module according to claim 2, wherein the positioning structure further has a fourth surface connected to the first surface, the second surface and the third surface, and the fourth surface overlaps the protruding portion of the optical film.
4. The backlight module according to claim 2, wherein the first surface, the second surface and the third surface are in a U-shaped arrangement.
5. The backlight module according to claim 1, wherein the optical film further has a base plate, the base plate has a second light extraction surface and a side surface connecting to the second light extraction surface, and the protruding portion of the optical films is located at the side surface.
6. The backlight module according to claim 1, wherein the numbers of the at least one optical film and the at least one positioning structure are respectively plural, and the accommodating space of each one of the positioning structures only accommodates the protruding portion of one of the optical films.
7. The backlight module according to claim 1, wherein the numbers of the at least one protruding portion of the optical film and the at least one positioning structure are respectively plural, and the protruding portions of the optical film are respectively disposed in the accommodating spaces of the positioning structures.
8. The backlight module according to claim 1, wherein the light guide plate further includes a plurality of protruding structures disposed on the light entrance surface of the light entrance portion, and each one of the light emitting devices is located between two adjacent ones of the protruding structures.
9. The backlight module according to claim 1, wherein the light entrance portion further includes a bottom surface opposite to the top surface, and the distance between the top surface and the bottom surface gradually decreases along a direction away from the light entrance surface.
10. The backlight module according to claim 1, wherein the positioning structure protrudes from the top surface of the light entrance portion, and the width of the positioning structure gradually decreases along the direction away from the light entrance surface.
Type: Application
Filed: Oct 22, 2012
Publication Date: Jan 2, 2014
Applicant: AU OPTRONICS CORP. (Hsin-Chu)
Inventors: Yu-Chieh KUAN (Hsin-Chu), Yung-Chih Liu (Hsin-Chu)
Application Number: 13/656,811