TWI421593B - Flat panel display device and backlight module thereof - Google Patents

Description

Flat display and backlight module

The present invention relates to a flat panel display, and more particularly to a backlight module in a flat panel display.

Generally, a liquid crystal display can be roughly divided into two main objects: a display panel and a backlight module. Since the display panel is not self-illuminating, it is necessary to use a backlight module to provide a sufficient and uniform light source to the liquid crystal panel, which is sufficient to constitute a fully functional display.

The main components of the backlight module include a reflection sheet, a light source, a light guide plate, a diffusion sheet, and a diamond lens. According to the position of the light source, the light source can be divided into two structures: a direct type and a side light type. The direct-lit backlight module has a light source disposed at the rear of the panel, and uses a diffusion sheet to homogenize the light, and requires a large space, and is mainly used for a large-sized product; the edge-lit backlight module has a lamp cover attached to the side of the panel, and The light source is placed in the accommodating space of the lamp cover, and the light source plate is used to uniformly project the light source to the panel, so that the display is light and thin, and is generally applied to small and medium sizes.

In the process of assembling the lampshade of the edge-lit backlight module, the conventional technology often uses the adhesive method to fix the plastic frame and the lamp cover. Only in this way, the accuracy of the positioning of the plastic frame and the lamp cover must be confirmed. If the positioning of the plastic frame and the lamp cover is inaccurate, in addition to the difficulty of heavy work, when the liquid crystal panel is assembled in the backlight module, the probability of fragmentation is easily increased due to the inconsistent appearance of the backlight module.

When the probability of occurrence of the above problems increases, the manufacturing cost will also increase relatively, so improving the above problems is an important issue.

In order to solve the above problems, the present invention provides a backlight module, which can be fixedly engaged in both horizontal and vertical directions during assembly of the plastic frame and the lamp cover, and in addition to reducing the rework rate, the appearance of the backlight module is also improved. Sexuality can reduce the probability of fragmentation of the LCD panel.

According to the above object of the present invention, a flat panel display including a display panel and a backlight module is provided. The backlight module is adjacent to the display panel and comprises a plastic frame, a lamp cover, a light source, a light guide plate and a plurality of optical films. The plastic frame has a plurality of grooves. The lampshade component comprises a sheet-like fastener; a casing having a C-shaped cross-section, the first end of which is coupled to the sheet-like fastener and the second end of which is coupled to an L-shaped plate. The L-shaped plate consists of a vertical section and a carrier section. A plurality of baffles are connected to the end of the carrying section, and the baffles and the vertical sections are respectively located on opposite sides of the carrying section, and are respectively corresponding to the plurality of grooves on the engaging plastic frame. The light source is disposed in the casing to provide the light source. The light guide plate is disposed between the sheet-shaped fixing member and the carrying portion of the L-shaped plate with respect to the light source for guiding the light projected by the light source. A plurality of optical films are placed adjacent to the light guide plate to provide functions of diffusion, light collection, and reflection deflection according to different optical film characteristics.

According to an embodiment of the invention, the plastic frame comprises a main body, an extension portion and a plurality of engaging members. The bottom side of the body has a plurality of grooves. The extension is connected to the inner edge of the body and is located on the same horizontal plane as the bottom side of the body, wherein the extension has a smaller cross-sectional area than the body. The plurality of engaging members are respectively located on the side walls of the plurality of grooves and are located on the other side with respect to the extending portion.

According to another embodiment of the invention, the plastic frame comprises a body and an extension. The bottom side of the body has a plurality of grooves, wherein one of the side walls of each of the grooves has a strip-shaped insertion hole on the other side with respect to the extension.

According to another embodiment of the present invention, a light guide plate and a sheet-shaped fastener are provided with a reflection sheet.

According to another embodiment of the invention, one of the sides of the engaging member is at the same level as the bottom side of the body.

According to another embodiment of the invention, the engaging member is located intermediate the side walls of the plurality of grooves of the body.

According to another embodiment of the invention, the engaging members have a triangular cross section.

According to another embodiment of the invention, the engaging members have a rectangular cross section.

According to another embodiment of the present invention, the baffle has a convex member for corresponding to the engaging member on the engaging plastic frame.

According to another embodiment of the invention, the length of the groove is approximately equal to the length of the baffle.

According to another embodiment of the present invention, the baffle has a convex member for the strip-shaped insertion hole on the engaging plastic frame.

According to another embodiment of the invention, the shape of the male member is substantially compatible with the strip-shaped insertion hole.

The invention provides a backlight module with a snap structure. When the backlight module is combined with the lamp cover, the backlight module can position the relative movement of the two in the horizontal direction and the vertical direction, thereby reducing assembly error of the backlight module.

1 is a partial cross-sectional view showing a flat panel display in accordance with a preferred embodiment of the present invention. In this embodiment, the flat panel display 100 includes a display panel 110 and a backlight module 120. The components of the backlight module 120 include a plastic frame 130, a lamp cover 140, a light source 170, a light guide plate 180, an optical film 190, and a reflective sheet 192. . The display panel 110 is disposed on the backlight module 120, and the lamp cover 140 is disposed on one side of the backlight module 120. The plastic frame 130 and the lamp cover 140 are engaged with each other, and the inner edge of the plastic frame 130 is adjacent to the plurality of optical films 190. The lamp cover 140 is provided with at least one light source 170, and the main function is to provide a light source required for the display panel 110. A light guide plate 180 is disposed on the upper side of the reflective sheet 192, and both are located between the optical film 190 and the sheet-shaped locking member 142 of the lamp cover 140. When the light source 170 is turned on, the light source is diffused and emitted through the light guide plate 180, and is evenly distributed in the light-emitting area. The reflective sheet 192 reflects the light leaked from the bottom side of the light guide plate 180 back to the light guide plate to prevent light leakage and increase light efficiency.

Fig. 2 is a side elevational cross-sectional view of the plastic frame 130 of Fig. 1. In this embodiment, the plastic frame 130 includes a main body 132, and the bottom side 133 has a plurality of vertically upwardly elongated grooves 134 (only one groove 134 is shown), as shown in the figure, the length direction thereof is Extends in the Y direction and is recessed in the Z direction. An extension 138 extending in the horizontal direction is coupled to the inner edge of the body 132, the bottom of which is located at the same level as the bottom side 133 of the body 132, and the cross-sectional area of the extension 138 is smaller than the cross-sectional area of the body 132. A plurality of engaging members 136 having a triangular cross section are respectively located at the side walls of each of the grooves 134, and have a slope inclined from the bottom side 133 toward the inside of the recess 134 with respect to the position of the extending portion 138. The engaging member 136 is configured to engage with the lamp cover 140 to fix the plastic frame 130 to avoid the deviation of the Z direction.

Please refer to Figures 3 and 4 at the same time. Fig. 3 is a partially enlarged view showing the lampshade of Fig. 1. Fig. 4 is a cross-sectional view taken along line 4-4' of Fig. 3; In Fig. 3, the lamp cover 140 includes a casing 144 having a C-shaped cross section for accommodating at least one light source 170 therein, and a first end 145 of the C-shape (the lower end of the C-type) and a sheet shape The locking member 142 is connected (please refer to FIG. 4), and the sheet-shaped locking member 142 is placed under the reflecting plate 192 (refer to FIG. 1) to avoid leakage of light from the light source 170. An L-shaped plate 150 having an L-shaped cross section is connected to a C-shaped second end 146 (upper end of the C-type) of the casing 144 (refer to FIG. 4), and a plurality of baffles are provided on the end of the L-shaped plate 150. 156 (only one baffle 156 is shown), the length direction of which extends in the Y direction and protrudes in the Z direction. Each of the baffles 156 has a protruding member 160, wherein the protruding member 160 is located in the accommodating space 157 formed by the L-shaped plate 150 and the baffle 156, and one of the cross-sections of the protruding member 160 and the top of the baffle 156 The sides are located on the same horizontal plane, and the lengths of the Y direction and the Z direction are smaller than the length of the baffle 156 in the same direction.

Please refer to Figure 4. In FIG. 4, the L-shaped plate 150 is composed of a vertical section 152 and a carrier section 154. One end of the vertical section 152 is connected to the C-shaped second end 146 of the casing 144 and extends downward, and the carrying section 154 is connected to the other end of the vertical section 152 and extends in the horizontal direction to make it C-shaped The sheet-like locking members 142 of one end 145 are disposed substantially in parallel. A plurality of baffles 156 (only one baffle 156 is illustrated in the illustration) are coupled to the ends of the load-bearing segments 154 and extend upwardly and are disposed on opposite sides or substantially parallel of the vertical segments 152. The baffles 156, the vertical segments 152 The accommodating space 157 formed by the carrying portion 154 is used for accommodating the plastic frame 130. In addition, the baffle 156 is used to couple the recess 134 of the bezel 130, and the protrusion 160 of the baffle 156 is used to engage the engaging member 136 of the recess 134 to prevent the plastic frame 130 from shifting in the Z direction.

Fig. 5 is a schematic cross-sectional view showing the combination of the plastic frame of Fig. 2 and the lampshade of Fig. 4. When the plastic frame 130 is engaged with the lamp cover 140, the engaging member 136 of the inner side wall of the recess 134 is embedded in the lower edge of the protruding member 160, so that the protruding member 160 and the engaging member 136 are mutually topped to prevent the plastic frame 130 from being displaced in the Z direction.

In this embodiment, the length of the convex member 160 and the recess 134 in the Y direction are approximately equal, so that the plastic frame 130 and the lamp cover 140 can be tightly engaged to prevent the Y direction of the two from being relatively offset, thereby causing the plastic frame 130 to be loose. In addition, the engaging member 136 has a triangular cross-sectional design and has a beveled surface. When the baffle 156 is received in the recess 134, the protruding member 160 can be easily inserted into the recess 134 along the inclined surface of the engaging member 136. In this case, the plastic frame 130 is not easily displaced in the X direction due to the space limitation formed by the baffle 156 and the vertical section 152. The engaging member 136 of the side wall of the groove 134 is embedded in the lower edge of the protruding member 160, so that the Z displacement of the plastic frame 130 is restricted, and it is not easy to loosen and fall off.

Please refer to FIGS. 6-8, which illustrate a second embodiment of the present invention. This embodiment differs from the first embodiment in the design of the male member, the male member having a rectangular cross section complementary to the engaging member of the plastic frame.

Figure 6 is an enlarged cross-sectional view showing a lamp cover of a second embodiment of the present invention. In Fig. 6, the biggest difference from the previous embodiment is that the length of the convex member 160 and the baffle 156 in the Y direction is about the same length, so that the convex member 160 can be embedded in the recess 134 of the plastic frame 130 as shown in Fig. 2. Producing too much margin causes slippage.

Figure 7 is an enlarged cross-sectional view showing the plastic frame of the second embodiment of the present invention. In FIG. 7 , the bottom edge of one of the engaging members 136 is located at the same horizontal plane as the bottom side 133 of the main body 132 of the plastic frame 130 , and the cross-sectional area of the engaging member 136 in the Z direction is approximately equal to the convex member 160 in FIG. 6 . The recess 158 between the load-bearing segments 154 allows the projections 160 of Figure 6 to be embedded in the recesses 134 of the present embodiment without creating excessive margins causing slippage.

Figure 8 is a sectional view showing the combination of the plastic frame in Fig. 7 and the lamp cover in Fig. 6. In Fig. 8, when the plastic frame 130 and the lamp cover 140 are assembled, the protruding member 160 is embedded in the recess 134, and the engaging member 136 is simultaneously The engagement of the plastic frame 130 with the lamp cover 140 is better, and the offset of the plastic frame 130 after assembly is reduced.

Please refer to Figures 9-11 for a third embodiment of the present invention. In this embodiment, the engaging member is located in the middle of the inner side wall of the groove, and the baffle has two unconnected convex members, so that the engaging member can be placed between the two convex members to achieve the engaging effect.

Figure 9 is an enlarged view of the lampshade. In Fig. 9, the top and bottom of the baffle 156 have a convex member (160; 160'), wherein the top side of the convex member 160 is at the same level as the top of the baffle 156, and the convex member 160' is located at the block. The bottom of the plate 156 and the upper side of the carrying portion 154 define a recess 158 formed between the two protruding members (160; 160') for receiving the engaging member 136.

Figure 10 is an enlarged view of the plastic frame. In Fig. 10, the engaging member 136 of the plastic frame 130 is located in the middle of the recess 134 with respect to the side wall of the extending portion 138, and the cross-sectional area of the engaging member 136 is slightly smaller than the recessed opening 158 (refer to Fig. 9), so that When the baffle 156 is placed in the recess 134, the engaging member 136 can be inserted into the recess 158.

Figure 11 is an enlarged view of the combination of the plastic frame and the lamp cover. It can be seen from Fig. 11 that since the position and shape of the protruding member (160; 160') and the engaging member 136 are complementary, the baffle 156 can be placed in the recess 134 to achieve a good bonding and fixing effect.

Please refer to Figures 12 to 14, which illustrate a fourth embodiment of the present invention. The difference between this embodiment and the foregoing embodiment is that the protruding member 160 is located in the middle of the baffle 156, and the inner side wall of the recess 134 has a strip-shaped insertion hole 135 corresponding to the position of the protruding member 160, so that the protruding member 160 is placed in the strip. When the hole 135 is fitted into the hole, the engagement effect can be achieved. In Fig. 12, the projection 160 is a rectangular insert having a length in the Y direction that is approximately equal to the length of the flap 156, adjacent to any of the non-top or bottom positions of the flap 156, and is located vertically. The section 152, the carrying section 154 and the accommodating space 157 formed by the baffle 156 are included. The length of the male member 160 in the Y direction may be smaller than the length of the shutter 156 in the Y direction without affecting the functionality of the male member 160.

Figure 13 is an enlarged view of a plastic frame of the embodiment. In Fig. 13, the inner side wall of the recess 134 has a strip-shaped insertion hole 135. The strip-shaped insertion hole 135 has a cross-sectional area that is approximately equal to the protrusion 160 and is located on the same level as the protrusion 160. When the frame 130 is engaged with the lamp cover 140, the protrusion 160 can be substantially compatible with the strip-shaped insertion hole 135. The protruding member 160 can be placed into the strip-shaped insertion hole 135.

Figure 14 is a combination of a plastic frame and a lampshade. It can be seen from the group diagram of FIG. 14 that the combination can also achieve the fixed engagement effect of the plastic frame 130 and the lamp cover 140, thereby reducing the incidence of the frame offset.

In the backlight module disclosed in the above embodiment of the present invention, a baffle plate and a convex member are designed on the lamp cover, and a groove and a convex member are engaged at the baffle frame, so that the plastic frame and the lamp cover are combined. The baffle and the groove are engaged with each other to reduce the offset ratio of the plastic frame in the horizontal and vertical directions. Compared with the current method of assembling the plastic frame and the lampshade, the rework rate required for the appearance of the backlight module after the plastic frame assembly is reduced can be reduced.

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. . . Flat panel display

110. . . Display panel

120. . . Backlight module

130. . . Plastic frame

132. . . main body

133. . . Bottom side

134. . . Groove

135. . . Strip embedded hole

136. . . Clip

138. . . Extension

140. . . lampshade

142. . . Sheet lock

144. . . C-section housing

145. . . First end

146. . . Second end

150. . . L-shaped board

152. . . Vertical section

154. . . Carrier segment

156. . . Baffle

157. . . Housing space

158. . . Depressed mouth

160. . . Projection

160’. . . Projection

170. . . Light source

180. . . Light guide

190. . . Optical film

192. . . A reflective sheet

1 is a partial cross-sectional view showing a flat panel display according to a first embodiment of the present invention.

Fig. 2 is a side elevational cross-sectional view showing the plastic frame of Fig. 1.

Fig. 3 is a partially enlarged view showing the lampshade of Fig. 1.

Fig. 4 is a cross-sectional view taken along line 4-4' of Fig. 3;

Fig. 5 is a combination diagram of Fig. 2 and Fig. 4.

Figure 6 is a cross-sectional enlarged view of the lampshade of the second embodiment of the present invention.

FIG. 7 is an enlarged cross-sectional view showing the plastic frame of the second embodiment of the present invention.

Figure 8 is a combination of Figure 6 and Figure 7.

Figure 9 is a cross-sectional enlarged view of the lampshade of the third embodiment of the present invention.

FIG. 10 is an enlarged cross-sectional view showing a plastic frame according to a third embodiment of the present invention.

Figure 11 is a combination of Figure 9 and Figure 10.

Figure 12 is an enlarged cross-sectional view showing a lamp cover of a fourth embodiment of the present invention.

Figure 13 is a cross-sectional enlarged view of the plastic frame of the fourth embodiment of the present invention.

Fig. 14 is a combination diagram of Fig. 12 and Fig. 13.

130. . . Plastic frame

132. . . main body

134. . . Groove

136. . . Clip

138. . . Extension

140. . . lampshade

142. . . Sheet lock

144. . . Cover

145. . . First end

146. . . Second end

150. . . L-shaped board

152. . . Vertical section

154. . . Carrier segment

156. . . Baffle

160. . . Projection

Claims (16)

A backlight module includes: a plastic frame, comprising: a main body having a plurality of grooves on a bottom side thereof; and an extending portion connected to an inner edge of the main body and located at a same level as a bottom surface of the main body, wherein One side wall of each of the grooves has a strip-shaped insertion hole or a snap member on the other side opposite to the extension portion; a lamp cover includes: a cover shell having a C-shaped cross section, the C-shaped cross section having a a first end and a second end; a piece of solid locking member connected to the first end of the casing; an L-shaped plate comprising: a vertical segment having a first end connected to the casing The second end; and a carrying section connected to the second end of the vertical section for carrying the plastic frame; and a plurality of baffles connected to the end of the carrying section and located in the vertical section The opposite side is configured to respectively correspond to the plurality of grooves for engaging the plastic frame, wherein the baffle has a convex member for correspondingly engaging the strip-shaped insertion hole or the engaging member of the plastic frame; Provided in the casing; and a light guide plate disposed on the L-shaped plate relative to the light source Between the segment and the sheet-shaped locking member, for guiding the light projected by the light source. The backlight module of claim 1, further comprising a reflector between the light guide plate and the sheet-shaped fixing member. The backlight module of claim 1, wherein a side of one of the engaging members is at the same horizontal plane as a bottom side of the main body. The backlight module of claim 1, wherein the engaging members are located between the side walls of the plurality of grooves of the main body. The backlight module of claim 1, wherein the engaging members have a triangular cross section. The backlight module of claim 1, wherein the engaging members have a rectangular cross section. The backlight module of claim 1, wherein the lengths of the grooves are approximately equal to the lengths of the baffles. The backlight module of claim 1, wherein the convex body is substantially compatible with the strip-shaped insertion hole. A flat panel display comprising: a display panel; a backlight module adjacent to the display panel, comprising: a plastic frame, comprising: a body having a plurality of grooves on a bottom side thereof; and an extension portion connected to an inner edge of the body, and The bottom surface of the main body is in the same horizontal plane, and one side wall of each of the grooves has a strip-shaped insertion hole or a snap member on the other side opposite to the extension portion; a lamp cover comprises: a cover shell, The C-shaped cross section has a first end and a second end; a piece of solid locking member connected to the first end of the casing; an L-shaped plate comprising: a vertical section, Having a first end connected to the second end of the casing; and a carrying section connected to the second end of the vertical section for carrying the plastic frame; and a plurality of baffles connected to the carrying The end of the segment is located on the opposite side of the vertical segment for respectively corresponding to the plurality of grooves for engaging the plastic frame, wherein the baffle has a convex member for correspondingly engaging the strip of the plastic frame Inserting a hole or the engaging member; a light source disposed in the casing; a light guide plate opposite to the Source is provided between the supporting section of the L-shaped plate fixed to the sheet-like lock member for guiding the light of the light source is projected a line; and a plurality of optical films adjacent to the light guide plate. The flat panel display of claim 9, further comprising a reflector between the light guide plate and the sheet-shaped fixing member. The flat-panel display of claim 9, wherein one of the side edges of the engaging members is on the same horizontal plane as the bottom side of the main body. The flat panel display of claim 9, wherein the engaging members are located intermediate the side walls of the plurality of recesses of the main body. The flat panel display of claim 9, wherein the engaging members have a triangular cross section. The flat panel display of claim 9, wherein the snap members have a rectangular cross section. The flat panel display of claim 9, wherein the lengths of the grooves are approximately equal to the lengths of the baffles. The flat panel display of claim 9, wherein the convex shape is substantially compatible with the strip-shaped insertion hole.