TWI382234B - Optical module - Google Patents

Description

Optical module

The present invention relates to a liquid crystal display, and more particularly to a positioning device for an optical film of a liquid crystal display.

Recently, optoelectronic technology has been continuously introduced, and the arrival of the digital era has promoted the vigorous development of the liquid crystal display market. Liquid crystal displays have many advantages such as high image quality, small size, light weight, low driving voltage and low power consumption. Therefore, it is widely used in consumer communication or electronic products such as personal digital assistants (PDAs), mobile phones, video recorders, notebook computers, desktop displays, car displays and projection TVs, and gradually replaces the cathode. The ray tube becomes the mainstream of the display.

The backlight module is one of the key components of the liquid crystal display. In view of the fact that the liquid crystal itself does not emit light, most liquid crystal displays generally need to be equipped with a backlight module to display an image that can be perceived by the naked eye. In addition, in order to make the brightness of the image more uniform, the manufacturer often adds an optical film, such as a light guide plate, a diffusion film or a brightness enhancement film, to the backlight module to adjust the brightness and distribution of the emitted light.

In order to accurately position the optical film, the manufacturer mostly uses tape to bond the optical film and the frame, thereby restraining the degree of freedom of the optical film in the direction of the vertical frame. However, due to the need for an extra tape, it is an additional burden for the preparation or assembly manpower.

One aspect of the present invention is an optical module that utilizes a stop block on the sidewall of the frame to constrain the degree of freedom of the optical film in the direction of the vertical frame.

According to an embodiment of the invention, an optical module includes an optical film, a frame and a limiting block. The optical film includes a body portion, a connecting portion and a lug, wherein the connecting portion connects the lug to the body portion. The frame includes a bottom plate and side walls. The bottom plate carries an optical film. The sidewall surrounds the edge of the optical film and the sidewall has a notch that breaks the sidewall of the frame. The limiting block is disposed on the sidewall of the frame and extends from the sidewall to the notch of the covering portion. The lug is embedded in the notch and is constrained between the bottom plate of the frame and the limit block.

FIG. 1 is a front elevational view of an optical module 100 in accordance with an embodiment of the present invention. Fig. 2 is a perspective view showing a portion M of Fig. 1. As shown, an optical module 100 includes an optical film 110, a frame 120, and a limiting block 130. The optical film 110 includes a main body portion 112, a connecting portion 114 and a lug 116, wherein the connecting portion 114 connects the lug 116 with the main body portion 112. The frame 120 includes a bottom plate 122 and side walls 124. The bottom plate 122 carries the optical film 110. The sidewall 124 surrounds the edge of the optical film 110, and the sidewall 124 has a notch 125 that breaks the sidewall 124 of the frame 120. The limiting block 130 is disposed on the sidewall 124 of the frame 120 and extends from the sidewall 124 to the notch 125 of the covering portion. The limiting block 130 and the sidewall 124 of the frame 120 are preferably integrally formed, but are not limited thereto. The lug 116 is embedded in the notch 125 and is constrained between the bottom plate 122 of the frame 120 and the limiting block 130.

That is to say, the optical module 100 of the present embodiment utilizes the limiting block 130 on the side wall 124 of the frame 120 to restrain the degree of freedom of the optical film 110 in the direction Z. As a result, the assembler will no longer need additional adhesive tape during assembly, as long as the lug 116 is embedded in the notch 125.

The above-mentioned "the limiting block 130 and the side wall 124 of the frame 120 are preferably integrally formed" should be interpreted as: "The limiting block 130 and the side wall 124 are preferably connected to each other without interruption and have the same material." The material of the limiting block 130 and the frame 120 (including the bottom plate 122 and the side wall 124) of the present embodiment may be plastic, such as polycarbonate (Polycarbonate; PC), so that the manufacturer can fabricate the frame 120 in an injection molding manner. With the limit block 130, no additional manufacturing procedures are required.

It should be understood that the above processes and materials are merely illustrative and are not intended to limit the invention. Various other processes can also be applied to fabricate the frame 120 and the limit block 130. The present invention has a general knowledge, and the embodiment of the frame 120 and the limiting block 130 should be elastically selected according to actual needs, as long as the limiting block 130 is disposed on the sidewall 124 of the frame 120 and the limiting block 130 and the sidewall 124 Can be combined.

In this embodiment, the number of the limiting blocks 130 may be a pair, and the limiting blocks 130 may cover opposite sides of the notch 125 respectively. That is to say, an opening 135 will be formed between the above-mentioned limiting blocks 130. When assembled, the lug 116 can pass through the opening 135 into the gap 125 to complete the positioning.

In the present embodiment, the optical film 110 is, for example, a diffusion sheet, a brightness enhancement sheet, a reflection brightness enhancing sheet, a crepe sheet or a protective sheet. The material of the lug 116 can be an elastic material. The term "elastic material" as used herein shall be interpreted as: "a material that can be restored to its original state after the external force has disappeared." Thus, during assembly, the assembler can slightly bend the lug 116 so that the lug 116 passes through the opening 135. . When the lug 116 passes through the opening 135, the assembler can release the lug 116, and the elasticity of the lug 116 itself will return the lug 116 to its original shape and be embedded in the notch 125.

In fact, the lug 116 of the optical film 110, the connecting portion 114 and the main body portion 112 may be integrally formed. That is to say, the lug 116, the connecting portion 114 and the main body portion 112 can be connected to each other without interruption, and the materials thereof are uniform. More specifically, the material of the lug 116, the connecting portion 114 and the main body portion 112 may be plastic, for example, polymethyl methacrylate (PMMA), polycarbonate (Polycarbonate; PC), or more. A combination of materials or other suitable materials for the manufacturer to produce together by hot pressing or injection molding.

It should be understood that the above processes and materials are merely illustrative and are not intended to limit the invention. Other various processes can also be applied to manufacture the lug 116, the connecting portion 114 and the main body portion 112. The present invention is generally known to those skilled in the art, and the embodiment of the lug 116, the connecting portion 114 and the main body portion 112 should be elastically selected as long as the lug 116, the connecting portion 114 is connected to the main body portion 112, and the lug. 116 can be bent by external force, and can be restored to its original state after the external force disappears.

In order to prevent the assembler from folding the main body portion 112 of the optical film 110 when bending the lug 116, the optical characteristics of the optical film 110 are affected, and the manufacturer may select the relief groove 140 at the connecting portion 114. The number of the relief grooves 140 described above may be a pair, which are respectively located on opposite sides of the connecting portion 114. By avoiding the barrier of the groove 140, the external force applied by the assembler when bending the lug 116 will not be transmitted to the body portion 112 of the optical film 110, so that the optical characteristics of the optical film 110 are affected.

The relative size relationship of the components in the optical module 100 depends on the material of the optical film 110 depending on the actual needs. For the present embodiment, the manufacturer can determine the relative dimensional relationship of the components in the optical module 100 according to the following formulas.

(1) B=A+2D

(2) F=B-2C

(3) E=1.2D

(4) 2/5F≦A≦3/5F

(5) 1/5F≦D≦3/10F

(6) 6/25F≦E≦9/25F

In the above formulas, A represents the width of the opening 135, B represents the width of the notch 125, C represents the assembly gap (generally 0.1 mm to 0.2 mm), and D represents the length of the portion of the limiting block 130 extending above the notch 125, E The length of the escape groove 140 is indicated, and F represents the width of the lug 116.

It should be understood that the relative dimensional relationships disclosed above are merely exemplary and are not intended to limit the present invention. Those skilled in the art to which the present invention pertains, the relative size relationship of each element should be determined according to actual needs.

As for the degree of freedom of the optical film 110 in the direction X and the direction Y, the manufacturer can choose to be restrained by the positioning post 126. In particular, the frame 120 of the present embodiment may further include at least one positioning post 126 , which may be located in the notch 125 and connected to the bottom plate 122 of the frame 120 . To fit the positioning post 126, the lug 116 can include at least one positioning slot 117 for the positioning post 126 to be embedded therein. In use, since the positioning post 126 is embedded in the positioning groove 117, the degree of freedom of the optical film 110 in the direction X and the direction Y can be surely restrained, thereby avoiding poor picture quality due to displacement or shaking.

Although the first and second embodiments illustrate the positioning post 126 as the bottom plate 122 of the connecting frame 120, the present invention is not limited thereto. In another embodiment of the present invention, the positioning post 126 may also be connected to the limiting block 130. The following figure will be taken as an example to specifically illustrate this technical content.

FIG. 3 is a partial perspective view of an optical module according to another embodiment of the present invention. The greatest difference between this embodiment and the previous embodiment is that the number of the positioning posts 126 of the present embodiment is a pair. The positioning posts 126 are respectively disposed on the limiting block 130 and extend from the limiting block 130 into the notch 125 respectively. To fit the positioning posts 126, the manufacturer can place the positioning slots 117 on opposite sides of the lugs 116, respectively, for the positioning posts 126 to be respectively embedded therein.

As for the other elements of the present embodiment, since they are the same as the previous embodiment, the description thereof will not be repeated.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and modified without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached.

100. . . Optical module

110. . . Optical diaphragm

112. . . Main body

114. . . Connection

116. . . Lug

117. . . Positioning slot

120. . . frame

122. . . Bottom plate

124. . . Side wall

125. . . gap

126. . . Positioning column

130. . . Limit block

135. . . Opening

140. . . Avoidance slot

A. . . Width of the opening

B. . . Gap width

D. . . The length of the limiting block extending above the notch 125

E. . . Avoidance slot length

F. . . The width of the lug

M. . . Local

X. . . direction

Y. . . direction

Z. . . direction

1 is a front elevational view of an optical module in accordance with an embodiment of the present invention.

Fig. 2 is a perspective view showing a portion M of Fig. 1.

FIG. 3 is a partial perspective view of an optical module according to another embodiment of the present invention.

110. . . Optical diaphragm

112. . . Main body

114. . . Connection

116. . . Lug

117. . . Positioning slot

120. . . frame

122. . . Bottom plate

124. . . Side wall

125. . . gap

126. . . Positioning column

130. . . Limit block

135. . . Opening

140. . . Avoidance slot

A. . . Width of the opening

B. . . Gap width

D. . . The length of the limiting block extending above the notch 125

E. . . Avoidance slot length

F. . . The width of the lug

M. . . Local

X. . . direction

Y. . . direction

Z. . . direction

Claims (13)

An optical module comprising: an optical film comprising a main body portion, a connecting portion and a lug, wherein the connecting portion connects the lug and the main body portion; a frame comprising: a bottom plate carrying the optical film And the at least one side wall surrounding the edge of the optical film, the side wall having at least one notch to break the side wall of the frame; and at least one limiting block disposed on the side wall of the frame and from the side wall The notch extends to the cover portion, wherein the lug is embedded in the notch and is constrained between the bottom plate of the frame and the limiting block. The optical module of claim 1, wherein the frame further comprises at least one positioning post located in the notch and connected to the bottom plate of the frame; and the lug further comprises at least one positioning groove for the positioning The column is embedded in it. The optical module of claim 1, wherein the number of the limiting blocks is plural, and the limiting blocks respectively cover opposite sides of the notch. The optical module of claim 3, further comprising: a plurality of positioning posts disposed on the limiting blocks and extending from the limiting blocks into the notches; and a plurality of positioning slots respectively located The opposite sides of the lug are for the positioning posts to be respectively embedded therein. The optical module of claim 3, further comprising: an opening between the limiting blocks, and the width of the opening is about 2/5 to 3/5 times the width of the lug. The optical module of claim 1, further comprising: at least one escape slot disposed at the connecting portion. The optical module of claim 6, wherein the number of the escape slots is plural, and the escape slots are respectively located on opposite sides of the connecting portion. The optical module of claim 6, wherein the escape groove has a length of about 1.2 times and the limit block extends over a length of the upper portion of the notch. The optical module of claim 6, wherein the escape groove has a length of about 6/25 to 9/25 times the width of the lug. The optical module of claim 1, wherein the length of the upper portion of the limiting block extending from the upper portion of the notch is about 1/5 to 3/10 times the width of the lug. The optical module of claim 1, wherein the lug is made of an elastic material. The optical module of claim 1, wherein the lug, the connecting portion and the main body are integrally formed. The optical module of claim 1, wherein the limiting block is integrally formed with the side wall of the frame.