TW201918735A - Backlight module and optical film positioning method - Google Patents

Abstract

A backlight module includes a back plate, a plastic frame, a light guide plate, and at least one optical film. Each of two opposite sides of the plastic frame has at least one glued section adhered to the back plate and a glueless section not adhered to the back plate. Two opposite side surfaces of the light guide plate forms a gap with the glueless section, and the optical film is disposed in a space defined by a light guide plate and the plastic frame. When the plastic frame is forced via its two opposite sides, each glueless section touches a side surface of the light guide plate and confines the optical film to a position.

Description

 Backlight module and optical film positioning method  

The invention relates to a backlight module and an optical film positioning method.

In the current backlight module design, when positioning the optical film, it is necessary to consider the expansion of the diaphragm and the assembly tolerance problem, so the gap between the left and right sides of the diaphragm and the plastic frame should be reserved, and the diaphragm needs to be assembled in the middle to avoid Problems such as bright lines caused by extreme assembly. Conventional designs typically use a jig for diaphragm positioning, but are limited by the cumulative tolerance effect and the current design requirements to minimize the reserved clearance. It is difficult to provide sufficient space for setting the limit fixture, resulting in an optical diaphragm. Unable to locate quickly and accurately.

The "Prior Art" section is only intended to aid in understanding the present invention, and thus the disclosure of the prior art paragraphs may contain some conventional techniques that are not known to those of ordinary skill in the art. The matters disclosed in the "Prior Art" section, which do not represent the subject matter or the problems to be solved by one or more embodiments of the present invention, are known or recognized by those of ordinary skill in the art prior to the present application.

The invention provides a backlight module design capable of quickly and accurately positioning an optical film.

Other objects and advantages of the present invention will become apparent from the technical features disclosed herein.

A backlight module according to an embodiment of the present invention includes a backplane, a plastic frame, a light guide plate, and at least one optical film. The plastic frame is fixed to the back plate, and the two opposite sides of the plastic frame respectively have at least one glued portion adhered to the back plate and at least one glueless portion that is not adhered to the back plate. The light guide plate is disposed on the inner side of the plastic frame, and the opposite sides of the light guide plate respectively form a gap with the glueless portion, and the optical film is disposed in a space defined by the light guide plate and the plastic frame. When the two opposite sides of the plastic frame are stressed, each glueless portion of the plastic frame contacts the side of the light guide plate and limits the optical film.

In one embodiment, each of the two opposite sides of the plastic frame comprises two glued sections and one glueless section, and the glueless section is located between the two glued sections, and the glueless section It can be smaller than the glued section.

In one embodiment, the two glue-free sections on the opposite sides of the frame are symmetrically distributed.

In one embodiment, a colloid can be used to adhere the optical film to a light-incident side of the light guide plate, and the glue can be a double-sided tape.

Another embodiment of the present invention provides an optical film positioning method. First, the two opposite sides of a plastic frame are adhered to a back plate, and a glueless portion is respectively left on the two opposite sides, and at least one optical film is stacked on a light guide plate. Then, the two non-adhesive sections of the plastic frame are urged to push the optical film through the respective glueless sections to move the optical film to a predetermined position. Furthermore, the optical film that has been in the preset position can be adhered and fixed to a light incident side of the light guide plate.

Embodiments of the invention have at least one of the following advantages. With the design of the above embodiments, it is only necessary to respectively retain a glueless section on the opposite sides of the plastic frame, that is, the optical film can be moved to a preset position by using a symmetric force application, without using an additional The fixture can quickly and accurately complete the positioning of the optical film on the light guide plate, thereby simplifying the production process and reducing the man-hour and cost.

Other objects and advantages of the present invention will become apparent from the technical features disclosed herein. The above and other objects, features, and advantages of the present invention will become more apparent from the understanding of the accompanying claims.

10‧‧‧Backlight module

12‧‧‧ Backplane

14‧‧‧ plastic frame

14a‧‧‧First section

14b‧‧‧second section

141‧‧‧ lower side

142‧‧‧ upper side

18‧‧‧Light guide

18a‧‧‧ side

22‧‧‧Optical diaphragm

24, 26‧‧ ‧ colloid

S10-S60‧‧‧ method steps

P‧‧‧ first side

Q‧‧‧ second side

S‧‧‧ light side

FIG. 1 is a schematic diagram of a backlight module according to an embodiment of the invention.

Fig. 2A is a schematic cross-sectional view taken along line A-A' of Fig. 1, and Fig. 2B is a schematic cross-sectional view taken along line B-B' of Fig. 1.

3 is a flow chart of a method of positioning an optical film according to an embodiment of the present invention.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the embodiments of the invention. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only directions referring to the additional drawings. Therefore, the directional terminology used is for the purpose of illustration and not limitation.

FIG. 1 is a schematic diagram of a backlight module according to an embodiment of the invention. Fig. 2A is a schematic cross-sectional view taken along line A-A' of Fig. 1, and Fig. 2B is a schematic cross-sectional view taken along line B-B' of Fig. 1. Referring to FIG. 1 , FIG. 2A and FIG. 2B , the backlight module 10 includes a back plate 12 , a plastic frame 14 , a light guide plate 18 , and at least one optical film 22 . The plastic frame 14 is disposed on the back plate 12, and the light guide plate 18 is disposed on the inner side of the plastic frame 14 and has at least one light incident side S. The optical film 22 is stacked on the light guide plate 18 and located at the light guide plate 18 and the plastic frame 14. Defined space. The plastic frame 14 has a first side P and a second side Q. The first side P and the second side Q respectively have at least one first section 14a and at least one second section 14b. In this embodiment, the first side P and the second side Q of the plastic frame 14 have two first sections 14a and one second section 14b, respectively, and the second section 14b is located in the two first sections 14a. between. The first section 14a is a glued section adhered to the backing plate 12 by the glue 24, and the second section 14b is a glueless section which is not adhered to the backing plate 12. As shown in FIG. 2A, in the first section 14a of the glue, the plastic frame 14 can be adhered to the backing plate 12 by a glue body 24, and a gap is formed between the plastic frame 14 and the side surface 18a of the light guide plate. 2B shows the situation of the rubber-free section on both sides of the plastic frame 14 under stress, as shown in FIG. 2B, when the two opposite sides of the plastic frame 14 are stressed, for example, a pushing structure (not shown) can be utilized. The first side P and the second side Q are respectively pushed toward the second portion 14b of the two sides of the plastic frame 14 toward the center of the plastic frame 14. Since the second rubber-free second portion 14b is not adhered to the back plate 12, The optical film 22 is pushed to move the optical film 22 to a predetermined position (e.g., a central position) on the light guide plate 18. It should be noted that the manner in which the second section 14b without the glue pushes the optical film 22 to the preset position is not limited. In this embodiment, the second section 14b of the plastic frame 14 and the side surface 18a of the light guide plate have a spacing between the two sides of the left and right second sections 14b of the plastic frame 14 when the force is applied. 141, which moves as shown in Fig. 2B until it contacts the side 18a of the light guide plate, causes the optical film 22 pushed by the upper side 142 of the second section 14b to be moved by a predetermined distance to a desired position. In other embodiments, for example, other glueless section movement limiting structures may be provided, or the degree of pushing of the thrusting structure (not shown) may be controlled to move the optical film 22 by a predetermined distance to a desired position. Yes. After the optical film 22 is moved to a predetermined position, the optical film 22 can be adhered and fixed to the light incident side S of the light guide plate by a colloid 26.

In an embodiment, the two glueless second sections 14b respectively located on the opposite sides of the plastic frame 14 may be symmetrically distributed. In one embodiment, the colloids 24, 26 can be, for example, double-sided tape, but are not limited. Moreover, in an embodiment, the second section 14b can be smaller than the first section 14a, but can also be changed according to actual needs, and only the effect of pushing the optical film 22 to the desired position can be obtained.

In summary, the embodiment of the present invention has at least one of the following advantages. With the design of the above embodiments, only one of the two sides of the plastic frame 14 is required to retain a glueless section, that is, the symmetric force can be utilized. The optical film 22 is moved to a preset position, and the positioning of the optical film 22 on the light guide plate can be quickly and accurately performed without using an additional jig, thereby simplifying the production process and reducing the man-hour and cost. purpose.

Another embodiment of the present invention provides an optical film positioning method. As shown in FIG. 3, in the optical film positioning method, firstly, two opposite sides of a plastic frame are adhered to a back plate, and a glueless portion is respectively retained on the two opposite sides (step S20), and at least An optical film is stacked on a light guide plate (step S30). Then, the two sides of the plastic frame are biased by the respective glueless sections, so that the respective glueless sections of the plastic frame push the optical film to move the optical film to a predetermined position (step S40). Furthermore, the optical film that has been located at the preset position can be adhered and fixed to a light incident side of the light guide plate (step S50). In an embodiment, the glueless section can contact the side of the light guide plate when subjected to a force.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent. In addition, any of the objects or advantages or features of the present invention are not required to be achieved by any embodiment or application of the invention. In addition, the terms "first" and "second" as used in the specification or the scope of the claims are only used to name the components or distinguish different embodiments or ranges, and are not intended to limit the upper or lower limits of the number of components. .

Claims (9)

 A backlight module includes: a back plate; a plastic frame fixed to the back plate, and the two opposite sides of the plastic frame respectively have at least one glued portion adhered to the back plate and not adhered to the back plate At least one glue-free section; a light guide plate disposed on the inner side of the plastic frame, and two opposite sides of the light guide plate respectively form a gap with the glue-free section; and at least one optical film disposed on the light guide plate And the space defined by the plastic frame; wherein when the two opposite sides of the plastic frame are stressed, each of the glueless segments of the plastic frame contacts the side of the light guide plate and is limited to the optical film.    The backlight module of claim 1, wherein each of the two opposite sides of the plastic frame comprises two glued sections and a glueless section, and the glueless section is located The two have glue sections between them.    The backlight module of claim 1, wherein the glueless section is smaller than the glued section.    The backlight module of claim 1, wherein the two glue-free sections on the opposite sides of the plastic frame are symmetrically distributed.    The backlight module of claim 1, further comprising: a colloid for attaching and fixing the optical film to a light incident side of the light guide plate.    The backlight module of claim 5, wherein the glue system is a double-sided tape.    An optical film positioning method includes: bonding two opposite sides of a plastic frame to a back plate, and respectively retaining a glueless portion on the two opposite sides; and stacking at least one optical film on a light guide plate And applying force to the two opposite sides of the frame via each of the glueless segments, such that the glueless segments push the optical film to move the optical film to a predetermined position.    The optical film positioning method of claim 7, further comprising: fixing the optical film located at the preset position to a light incident side of the light guide plate.    The optical film positioning method of claim 7, wherein each of the glueless segments contacts a side of the light guide plate when subjected to a force.