TW201329572A - Fixing structure of optical films - Google Patents

Abstract

The invention sets forth a fixing structure of optical films. A first optical film, which has a first thermal expansion coefficient, is arranged to have a first ear. The first ear engages with a first fixing section of a side-frame and forms a first gap. A second optical film, which has a second thermal expansion coefficient, is arranged to have a second ear. The second ear engages with a second fixing section of the side-frame and forms a second gap. A third optical film, which has a third thermal expansion coefficient, is arranged to have a third ear. The third ear engages with a third fixing section of the side-frame and forms a third gap. The first gap, the second gap and the third gap are designed according to the first thermal expansion coefficient, the second thermal expansion coefficient and the third thermal expansion coefficient, respectively.

Description

Fixed structure of optical film

The present invention relates to a fixed structure of a diaphragm, and more particularly to a fixing structure for an optical film suitable for a backlight module.

Today, liquid crystal displays have replaced traditional image tube displays and become the mainstream in the market. The display mode of the liquid crystal display belongs to the non-active light emitting. Therefore, the liquid crystal display needs to be provided with an active light emitting element capable of providing a light source on the back of the display panel, which is a backlight module. The backlight module has a light source. The light source is generally a Cold Cathode Fluorescent Lamp (CCFL) or a Light-Emitting Diode (LED). In order to make the image displayed by the display panel uniform and clear, the average light distribution of the light generated by the light source enters the display panel has a key influence. Therefore, the backlight module needs to mix and diffuse the light of the light source through reflection and refraction. Allows light to be evenly distributed across the display panel. To this end, the backlight module generally uses a combination of a reflective sheet, a light guide plate and an optical film to achieve the above object. Preferably, a plurality of optical films having different functions are used to make the light diffusion and diffusion more uniform. The optical films are, for example, a cymbal, a diffusion film, a brightness enhancement film, a polarizer, and a reflective brightening. membrane.

The optical film is disposed on the side of the optical film, and the position is corresponding to the fixing portion of the frame of the backlight module. The ear portions are overlapped to form an engaging opening, and the engaging opening is engaged with the fixing portion to make the optical film. The piece is joined to the frame. Moreover, it is considered that the optical film will expand and contract, so that a gap is left between the engaging opening and the fixing portion. The problem is that different optical films have different thermal expansion coefficients. When the temperature changes, the degree of thermal expansion and contraction varies. This situation may cause warping or moiré ( Mura) phenomenon. In summary, a single fixed structure is not suitable for general application to various optical films. Therefore, it is necessary to separately arrange a suitable fixed structure for different optical films.

In view of the above, an object of the present invention is to provide a fixing structure for an optical film which is provided with an optical fixing film having different thermal expansion coefficients, and is provided with a corresponding fixing structure to accommodate thermal expansion of each optical film due to temperature change. Cold shrinking.

In order to achieve the above object, the present invention provides a fixing structure for an optical film, which is suitable for a backlight module, and the fixing structure of the optical film comprises a first ear portion, a second ear portion and a back plate. The first ear portion is disposed on a side of the first optical film, the first optical film has a first thermal expansion coefficient; the second ear portion is disposed on a side of the second optical film, and the second optical film has a first Two coefficients of thermal expansion. The back plate has a bottom plate and a frame, and the frame is respectively disposed with a first fixing portion and a second fixing portion corresponding to the first ear portion and the second ear portion, and the frame and the bottom plate form an accommodation space, and the accommodation space is used for accommodating a first optical film and a second optical film. The first optical film is placed on the bottom plate and the first ear portion is joined to the first fixing portion. A first gap is formed between the first ear portion and the first fixing portion, and the first gap corresponds to the first thermal expansion coefficient. The second optical film is placed on the first optical film, the second ear is joined to the second fixing portion, a second gap is formed between the second ear and the second fixing portion, and the second gap corresponds to the second Thermal expansion coefficient.

In a preferred embodiment of the present invention, the fixing structure of the optical film further includes a third ear portion, the third ear portion is extended on a side of the third optical film, and the third optical film has The third coefficient of thermal expansion. The bezel is provided with a third fixing portion corresponding to the third ear portion. The third optical film is placed in the accommodating space, and the third ear portion is joined to the third fixing portion, and a third gap is formed between the third ear portion and the third fixing portion, and the third gap corresponds to the third portion. Thermal expansion coefficient.

In a preferred embodiment of the present invention, the first ear portion, the second ear portion and the third ear portion are concave structures protruding from the side edges, and each has a first engaging opening. The second engaging opening and the third engaging opening. Each of the first fixing portion, the second fixing portion, and the third fixing portion has a first engaging piece, a second engaging piece, and a third engaging piece. The first engaging piece, the second engaging piece and the third engaging piece are respectively joined to the first engaging opening, the second engaging opening and the third engaging opening.

In another preferred embodiment of the present invention, the first ear portion, the second ear portion and the third ear portion are a back-shaped structure protruding from the side edges, and each has a first card. The joint, the second engaging opening and the third engaging opening. Each of the first fixing portion, the second fixing portion, and the third fixing portion has a first engaging piece, a second engaging piece, and a third engaging piece. The first engaging piece, the second engaging piece and the third engaging piece are respectively joined to the first engaging opening, the second engaging opening and the third engaging opening.

In a preferred embodiment of the present invention, a double-sided tape is disposed between the first optical film, the second optical film, and the third optical film.

In a preferred embodiment of the present invention, the first optical film is any one or any combination of a silicon film, a diffusion film, a brightness enhancement film, a polarizer, and a reflective brightness enhancement film; The second optical film is any one or any combination of a silicon film, a diffusion film, a brightness enhancement film, a polarizer and a reflective brightness enhancement film; the third optical film is a silicon film, a diffusion film, and a light enhancement. Any one or any combination of a sheet, a polarizer, and a reflective brightness enhancing film.

In a preferred embodiment of the present invention, the first ear portion, the second ear portion and the third ear portion are respectively located on the left side of the first optical film, the second optical film and the third optical film. Right side. In another preferred embodiment of the present invention, the first ear portion, the second ear portion and the third ear portion are respectively located on the first optical film, the second optical film and the third optical film. And the lower side; or the first ear portion, the second ear portion and the third ear portion are respectively located on the upper, lower, left and right sides of the first optical film, the second optical film and the third optical film .

In a preferred embodiment of the present invention, the backlight module further includes a reflective sheet, a light guide plate and a light source module. The reflective sheet is disposed on the bottom plate, and the light guide plate is disposed on the reflective sheet and the first optical film. The light source module is disposed on a side of the light guide plate.

The fixing structure of the optical film proposed by the invention is such that the optical films having different thermal expansion coefficients are respectively joined to the corresponding fixing portions to avoid warping and moiré phenomenon due to thermal expansion and contraction. In addition, since the ear positions of the different optical films are respectively bonded to the fixing portions corresponding to the frame, the bonding mode also has the effect of preventing the fool, and the overlapping order of the optical films can be avoided.

In order to make the objects, features, and advantages of the present invention more readily understood by those of ordinary skill in the art, the following description of the preferred embodiments and the accompanying drawings.

Please refer to FIG. 1 , FIG. 2A , FIG. 2B and FIG. 2C . FIG. 1 is a schematic view showing a fixing structure of an optical film according to a preferred embodiment of the present invention; FIG. 2A , FIG. 2B and FIG. It is the a site, the b site, and the c site of the fixed structure of the optical film shown in Fig. 1.

The fixing structure of the optical film of the present invention is applicable to the backlight module 100. The fixing structure of the optical film includes a first ear portion 121, a second ear portion 131, a third ear portion 141 and a back plate 110. . The first ear portion 121 is disposed on a side of the first optical film 120, the first optical film 120 has a first thermal expansion coefficient, and the second ear portion 131 is disposed on a side of the second optical film 130. The optical film 130 has a second coefficient of thermal expansion, the third ear portion 141 is extended on the side of the third optical film 140, and the third optical film 140 has a third coefficient of thermal expansion. The first thermal expansion coefficient, the second thermal expansion coefficient, and the third thermal expansion coefficient are all different, so when the temperature changes, the first optical film 120, the second optical film 130, and the third optical film The degree of thermal expansion and contraction caused by 140 is also different, so that corresponding fixing structures are respectively arranged.

The back plate 110 has a bottom plate 112 and a frame 111. The frame 111 is respectively disposed with a first fixing portion 150, a second fixing portion 160 and a third fixing corresponding to the first ear portion 121, the second ear portion 131 and the third ear portion 141. Part 170. The frame 111 and the bottom plate 112 are formed with an accommodating space for accommodating the first optical film 120, the second optical film 130 and the third optical film 140.

The first optical film 120 is placed on the bottom plate 112 and the first ear portion 121 is joined to the first fixing portion 150. A first gap is formed between the first ear portion 121 and the first fixing portion 150. The first gap corresponds to the first gap. The first coefficient of thermal expansion, that is, the first gap is designed according to the first coefficient of thermal expansion of the first optical film 120, so that the amount of thermal expansion generated by the first optical film 120 during temperature rise can be matched to the first gap. The second optical film 130 is placed on the first optical film 120 and the second ear portion 131 is joined to the second fixing portion 160. The second gap is formed between the second ear portion 131 and the second fixing portion 160. The second gap corresponds to the second coefficient of thermal expansion, that is, the second gap is designed according to the second coefficient of thermal expansion, and the amount of thermal expansion generated by the second optical film 130 during temperature rise can be matched to the second gap. The third optical film 140 is placed on the second optical film 130 and the third ear portion 141 is joined to the third fixing portion 170. The third ear portion 141 and the third fixing portion 170 are formed according to a third thermal expansion coefficient. The designed third gap, the third gap corresponds to the third coefficient of thermal expansion, and the amount of thermal expansion generated by the third optical film 140 during temperature rise can be matched to the third gap.

The first ear portion 121, the second ear portion 131 and the third ear portion 141 are concave structures protruding from the sides of the first optical film 120, the second optical film 130 and the third optical film 140, respectively. And having a first engaging opening 122, a second engaging opening 132 and a third engaging opening 142, respectively. The first fixing portion 150, the second fixing portion 160, and the third fixing portion 170 respectively have a first engaging piece 151 and a second engaging piece 161 which are bent by the frame 111 toward the accommodating space and then bent upward. The third engaging piece 171. The first engagement piece 151 , the second engagement piece 161 , and the third engagement piece 171 are respectively joined to the first engagement opening 122 , the second engagement opening 132 , and the third engagement opening 142 . The first gap, the second gap and the third gap are the first engaging piece 151 and the first engaging opening 122, the second engaging piece 161 and the second engaging opening 132, and the third engaging piece 171, respectively. A gap formed between the third engagement opening 142 and the third engagement opening 142.

A double-sided tape (not shown) may be disposed between the first optical film 120, the second optical film 130, and the third optical film 140 to enhance the stability between the optical films.

The first optical film 120, the second optical film 130, and the third optical film 140 may be any one or a combination of a ruthenium film, a diffusion film, a brightness enhancement film, a polarizer, and a reflective brightness enhancement film. , depending on its coefficient of thermal expansion. That is, if the thermal expansion coefficients of the first optical film and the third optical film are the same or very similar, the fixed structures of the two may be shared, more specifically, the first optical film and the third optical film. The ears of the sheet may be placed in the same position to be overlapped and joined to the same fixing portion on the bezel.

Please refer to FIG. 3. FIG. 3 is a partial cross-sectional view showing the fixing structure of the optical film according to a preferred embodiment of the present invention, taking the d-d portion shown in FIG. 1 as an example. The dd portion is a cross-sectional view of the junction of the second optical film 130 and the second fixing portion 160, and FIG. 3 illustrates a cross-sectional view of the second engaging opening 132 of the second ear portion 131 joined to the second engaging piece 161. . The backlight module 100 further includes a reflective sheet 192, a light guide plate 191, a front frame 180, and a light source module (not shown). The reflection sheet 192 is disposed on the bottom plate 112, the light guide plate 191 is disposed between the reflection sheet 192 and the first optical film 120, and the light source module is disposed on the side of the light guide plate 191. The front frame 180 is fixed to the back plate 110 to limit the first optical film 120, the second optical film 130 and the third optical film 140 to the accommodating space.

In this embodiment, the first ear portion 121, the second ear portion 131, and the third ear portion 141 are located on the left and right sides of the first optical film 120, the second optical film 130, and the third optical film 140, respectively. . In other embodiments, the first ear portion, the second ear portion, and the third ear portion may also be located on the upper and lower sides of the first optical film, the second optical film, and the third optical film, respectively; or The first ear portion, the second ear portion and the third ear portion are respectively located at any combination of the upper, lower, left and right sides of the first optical film, the second optical film and the third optical film. In addition, in other embodiments, the fixing structure of the optical film is not limited to three kinds of optical films, and only two optical films and corresponding fixing structures may be included, and more than four kinds of optical films and corresponding ones may be included. Fixed structure.

Referring to FIG. 4, FIG. 4 is a partial enlarged view showing a fixing structure of a first optical film according to another preferred embodiment of the present invention. The first ear portion 221 of the first optical film 220 is a retro-shaped structure. The first engaging portion 222 on the frame 211 has a first engaging piece 251, and the first engaging piece 251 is disposed to pass through the first engaging opening 222.

In summary, the present invention is a fixed structure of an optical film, and optical films having different thermal expansion coefficients are respectively joined to corresponding fixing portions to avoid warping and moiré due to thermal expansion and contraction. In addition, since the ear positions of the different optical films are respectively bonded to the fixing portions corresponding to the frame, the bonding mode also has the effect of preventing the fool, and the overlapping order of the optical films can be avoided. The invention has better elasticity and adaptability than the prior art, and can improve the display effect.

While the present invention has been described above in terms of the preferred embodiments thereof, it is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application.

100. . . Backlight module

110. . . Backplane

111, 211. . . frame

112. . . Bottom plate

120, 220. . . First optical film

121, 221. . . First ear

122, 222. . . First snap port

130. . . Second optical film

131. . . Second ear

132. . . Second snap port

140. . . Third optical film

141. . . Third ear

142. . . Third snap port

150, 250. . . First fixed part

151, 251. . . First snap

160. . . Second fixed part

161. . . Second snap

170. . . Third fixed part

171. . . Third snap

180. . . Front frame

191. . . Light guide

192. . . A reflective sheet

FIG. 1 is a schematic view showing a fixing structure of an optical film according to a preferred embodiment of the present invention.

2A is a partial enlarged view of a fixing structure of a first optical film according to a preferred embodiment of the present invention.

2B is a partial enlarged view of a fixing structure of a second optical film according to a preferred embodiment of the present invention.

2C is a partial enlarged view of a fixing structure of a third optical film according to a preferred embodiment of the present invention.

3 is a partial cross-sectional view showing a fixing structure of an optical film according to a preferred embodiment of the present invention.

FIG. 4 is a partially enlarged view showing a fixing structure of a first optical film according to another preferred embodiment of the present invention.

100. . . Backlight module

110. . . Backplane

111. . . frame

112. . . Bottom plate

121. . . First ear

131. . . Second ear

140. . . Third optical film

141. . . Third ear

150. . . First fixed part

160. . . Second fixed part

170. . . Third fixed part

Claims (10)

The fixing structure of the optical film is suitable for a backlight module, wherein the fixing structure of the optical film comprises:
a first ear portion extending from a side of a first optical film, the first optical film having a first thermal expansion coefficient;
a second ear portion extending from a side of a second optical film, the second optical film having a second coefficient of thermal expansion;
a backplane having a bottom plate and a frame, the frame being respectively disposed with a first fixing portion and a second fixing portion corresponding to the first ear portion and the second ear portion, the frame and the bottom plate Forming an accommodating space for accommodating the first optical film and the second optical film, the first optical film is placed on the bottom plate and the first ear is coupled to the a first fixing portion, a first gap is formed between the first ear portion and the first fixing portion, the first gap corresponds to the first thermal expansion coefficient; and the second optical film is placed on the first optical film The second ear portion is coupled to the second fixing portion, and a second gap is formed between the second ear portion and the second fixing portion, the second gap corresponding to the second coefficient of thermal expansion. The fixing structure of the optical film of claim 1, wherein the fixing structure of the optical film further comprises a third ear portion extending from a side of the third optical film. The third optical film has a third thermal expansion coefficient, and the frame is disposed with a third fixing portion corresponding to the third ear portion, the third optical film is placed in the accommodating space and the third The ear portion is coupled to the third fixing portion, and a third gap is formed between the third ear portion and the third fixing portion, and the third gap corresponds to the third coefficient of thermal expansion. The fixing structure of the optical film of claim 2, wherein the first ear portion, the second ear portion and the third ear portion are concave structures protruding from the side edges, Each of the first fixing portion, the second fixing portion and the third fixing portion respectively has a first engaging piece and a second receiving portion. a first engaging piece, the second engaging piece and the third engaging piece are respectively engaged with the first engaging opening, the second engaging opening and the third card, and the third engaging piece Joint mouth. The fixing structure of the optical film of claim 2, wherein the first ear portion, the second ear portion and the third ear portion are a retro-shaped structure protruding from the side edge, Each of the first fixing portion, the second fixing portion and the third fixing portion respectively has a first engaging piece and a second receiving portion. a first engaging piece, the second engaging piece and the third engaging piece are respectively engaged with the first engaging opening, the second engaging opening and the third card, and the third engaging piece Joint mouth. The fixing structure of the optical film of claim 2, wherein a double-sided tape is disposed between the first optical film, the second optical film, and the third optical film. The fixing structure of the optical film of claim 1, wherein the first optical film is any one of a ruthenium film, a diffusion film, a brightness enhancement film, a polarizer, and a reflective brightness enhancement film. random combination. The fixing structure of the optical film of claim 1, wherein the second optical film is any one of a cymbal, a diffusion film, a brightness enhancement film, a polarizer, and a reflective brightness enhancement film. random combination. The fixing structure of the optical film of claim 2, wherein the third optical film is any one of a ruthenium film, a diffusion film, a brightness enhancement film, a polarizer, and a reflective brightness enhancement film. random combination. The fixing structure of the optical film of claim 2, wherein the first ear portion, the second ear portion and the third ear portion are respectively located on the first optical film and the second optical film. a first optical portion, a second optical portion, and a second optical portion The upper and lower sides of the third optical film; or the first ear portion, the second ear portion, and the third ear portion are respectively located on the first optical film, the second optical film, and the Upper, lower, left and right sides of the third optical film. The fixed structure of the optical film of claim 1, wherein the backlight module further comprises a reflective sheet, a light guide plate and a light source module, wherein the reflective sheet is disposed on the bottom plate, the light guide plate And disposed between the reflective sheet and the first optical film, the light source module is disposed at a side of the light guide plate.