CN103327771B - Display device and backlight module thereof - Google Patents

Abstract

The present invention provides a backlight module and a display device using the backlight module. The display device includes a backlight module and a liquid crystal display panel configured on the backlight module. The backlight module includes a frame, wherein the frame includes a frame body and a carrying portion, the frame body is located outside the carrying portion and the frame body is connected to the carrying portion, the carrying portion has a first surface and a second surface relative to the first surface, the first surface is a right angle corresponding to a corner of the carrying portion, the second surface is an arc angle corresponding to the corner, and the position of the arc angle projected on the first surface is between the right angle and the outer edge of the carrying portion.

Description

Display device and backlight module thereof

technical field

The invention relates to a frame, in particular to a backlight module and a display device using the backlight module.

Background technique

Due to the advantages of liquid crystal display (Liquid Crystal Display, LCD) compared with cathode ray tube (Cathode Ray Tube, CRT) display, which is thinner, lighter in weight, more convenient to carry, and lower in radiation, the demand has increased rapidly in recent years. Especially the backlight module (BacklightModule) is one of the key components of the liquid crystal display device. With the improvement of manufacturing technology of liquid crystal display devices, the backlight module is developing towards the market direction of thinner shape, higher brightness and lower cost. In order to maintain the competitiveness of the liquid crystal display device in the future market, developing and designing a better quality backlight module is the direction that needs to be worked hard in the future.

Since the connector electrically connecting the backlight module and the system end is arranged at the corner of the back frame, the optical film needs to cut off a truncated corner at the corner corresponding to the back frame to allow the connector to avoid contact between the optical film and the system. Connector interference. However, in order to achieve the purpose of narrowing the frame and reducing the size of the liquid crystal display device, the light source module located next to the supporting part of the frame is very close to the visible area of the liquid crystal display panel, and the truncated edge of the optical film has a certain Thickness converges light, resulting in bright lines at the cutting edge of the truncated corner of the optical film, resulting in bright lines and light leakage on the display screen, and the display quality cannot meet the specification requirements.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a backlight module and a display device to solve the light leakage problem encountered in the existing backlight module, and can effectively reduce the light leakage phenomenon without changing the size of the frame.

In order to achieve the above-mentioned purpose, the present invention proposes a frame, which has a frame body and a bearing portion, the frame body is located on the periphery of the load-bearing portion and connected to the load-bearing portion, and the load-bearing portion has a first surface and a second surface opposite to the first surface , the first surface corresponds to a corner of the bearing portion with a right angle, the second surface corresponds to a corner with an arc angle, and the position of the arc angle projected on the first surface is located between the right angle and the outer edge of the bearing portion.

The advantage of applying the disclosed content is that the frame design can achieve the purpose of narrow frame and volume reduction of the liquid crystal display device, and avoid bright lines and light leakage.

The advantages and spirit of the present invention can be further understood through the following detailed description of the invention and the accompanying drawings.

Description of drawings

FIG. 1A shows an exploded schematic diagram of a display device in an embodiment of the present invention;

FIG. 1B shows a schematic diagram of a display device in an embodiment of the present invention;

Fig. 2 shows the sectional view of Fig. 1B taken along line A-A;

3A and 3B are schematic diagrams showing the corners of the bearing part in an embodiment of the present invention;

Fig. 4 shows a bottom view of a corner of the bearing part in an embodiment of the present invention.

reference sign

10: display device 100: backlight module

110: Frame 111: Frame

113: carrying part 114: corner

200: first side 220: second side

240 first side wall 250: second side wall:

241: first side 242: second side

251: third side 252: fourth side

2421: first horizontal section 2521: second horizontal section

2422: the first bending section 2522: the second bending section

270: Skirt 273: Arc

160: back frame 210: outer edge of bearing part

271: first skirt 272: second skirt

170: Liquid crystal display panel 180: Front frame

120: Optical film 121: Light-emitting surface

122: cutting edge 130: light guide plate

140: reflector 150: light source module

151: connector 152: light source

153: Circuit board 154: Colloid

P1: first endpoint P2: second endpoint

P4: midpoint I1: first intercept point

I2: second intercept point 112, 260: spacer

detailed description

The following will take a backlight module applied in a display device as an example for illustration, but it is not intended to limit the application of the backlight module of the present invention.

FIG. 1A shows an exploded schematic diagram of a display device in an embodiment of the present invention. FIG. 1B shows a schematic diagram of a display device in an embodiment of the present invention. FIG. 2 shows a cross-sectional view of FIG. 1B taken along line A-A. Please refer to FIG. 1A , FIG. 1B and FIG. 2 at the same time. The display device 10 includes a front frame 180 , a liquid crystal display panel 170 and a backlight module 100 . The backlight module 100 has a frame 110, a back frame 160, an optical film 120, a light guide plate 130, a reflective sheet 140, and a light source module 150, wherein the optical film 120, the light guide plate 130, the reflective sheet 140, and the light source module 150 are arranged on the back frame 160 within. The frame 110 has a frame body 111 and a bearing part 113. The frame body 111 is located at the periphery of the bearing part 113 and the frame body 111 is connected to the bearing part 113. The frame body 111 surrounds components such as the optical film 120, the light guide plate 130, and the light source module 150. The bearing part 113 has a first surface 200 and a second surface 220 opposite to the first surface 200 , the first surface 200 is used to support the liquid crystal display panel 170 , and the second surface 220 presses against the light-emitting surface 121 of the optical film 120 . A spacer 112 can be provided on the first surface 200, and a spacer 260 can be provided on the second surface 220 to provide cushioning and shock absorption effects. In this way, the liquid crystal display panel 170 and the optical film can be avoided during transportation or assembly. 120 collided with the frame 110 and was damaged. The cushion block 112, 260 can be made of elastic material, such as foam, silica gel, rubber or plastic.

The light source module 150 is set in the back frame 160 and has a connector 151 ( FIG. 1A ), a light source 152 and a circuit board 153 . The connector 151 is used for electrical connection between the backlight module 100 and the system end, and the connector 151 is arranged on the carrying portion 113 A corner of 114 under. The light source 152 is electrically connected to the circuit board 153 and attached to the back frame 160 via the glue 154 . The backlight module 100 can be designed in different ways such as direct-type or side-type light sources, and the light source 152 used can be a light-emitting diode (Light-Emitting Diode, LED), a cathode ray tube, or other types of point light sources and line light sources. or a surface light source. In the embodiment shown in FIG. 2 , the backlight module 100 adopts the design of a side-type light source. The light source module 150 is adjacent to the light guide plate 130. light distribution. The optical film 120 includes a diffusion film, a brightness enhancement film or other films, which can adjust the light output by the light source module 150 to meet design requirements.

3A and 3B are schematic diagrams showing the corners of the carrying portion in an embodiment of the present invention. Fig. 4 shows a bottom view of a corner of the bearing part in an embodiment of the present invention. For convenience of description, an optical film 120 is added in FIG. 3A and FIG. 3B for illustration. Please refer to FIG. 3A, FIG. 3B and FIG. 4 at the same time, the first surface 200 of the corner 114 of the frame 110 is a right angle, the second surface 220 is an arc angle, and the position of the arc angle projected on the first surface 200 is located at a right angle and the bearing portion 113 In other words, the first surface 200 forms a right angle at the corner 114, the second surface 220 forms an arc angle at the corner 114, and the projection position of the edge of the arc angle on the first surface 200 is not in line with the right angle The edges overlap.

To further illustrate, the corner 114 has a first side wall 240 , a second side wall 250 and a skirt 270 , and the first side wall 240 , the second side wall 250 and the skirt 270 are located between the first surface 200 and the second surface 220 , the first side wall 240 is connected to the second side wall 250, the first side wall 240 has a first side 241 and a second side 242, the first side 241 is connected to the first surface 200 and the second side 242 is connected to the skirt 270 The upper edge of the second side wall 250 has a third side 251 and a fourth side 252, the third side 251 is connected to the first surface 200 and the fourth side 252 is connected to the upper edge of the skirt 270, and the skirt 270 The lower edge is connected with the second surface 220 . In other words, the corner 114 of the first surface 200 is a right-angled corner formed by the first side 241 and the third side 251 being perpendicular to each other, and the second side 242 and the fourth side 252 are also upper edges of the skirt 270 .

The second side 242 of the first side wall 240 is a curve, and the second side 242 has a first intercept point I1, a first horizontal section 2421 and a first bending section 2422, and the first intercept point I1 is located between the first horizontal section 2421 and the first bending section 2422. Between the first bending section 2422, from the first intercept point I1 to the junction of the first side wall 240 and the second side wall 250 is the first bending section 2422, away from the first intercept point I1 from the first side wall 240 and the second side wall 250. The junction of the second sidewall 250 is the first horizontal section 2421 . The first intercept point I1 is the end point of the first bending section 2422 and the starting point of the first horizontal section 2421 , and the first horizontal section 2421 and the first bending section 2422 are tangent to the first intercept point I1 . In addition, the shortest distance from any point on the first horizontal section 2421 of the second side 242 of the first side wall 240 to the first side 241 is equal in length. The shortest distance from any point on the first bending section 2422 to the first side 241 is unequal, and the shortest distance gradually increases closer to the junction of the first sidewall 240 and the second sidewall 250 . Similarly, the fourth side 252 of the second side wall 250 of the carrying portion 113 is a curve, the fourth side 252 has a second intercept point I2, a second horizontal section 2521 and a second bent section 2522, and the second intercept point I2 is located at Between the second horizontal section 2521 and the second bent section 2522, from the second intercept point I2 to the junction of the first side wall 240 and the second side wall 250 is the second bent section 2522, from the second intercept point Where I2 is away from the first sidewall 240 and meets the second sidewall 250 is a second horizontal section 2521 . The second intercept point I2 is the end point of the second bending section 2522 and the starting point of the second horizontal section 2521 , and the second horizontal section 2521 is tangent to the second bending section 2522 at the second intercept point I2. In addition, the shortest distance from any point on the second horizontal section 2521 of the fourth side 252 to the third side 251 is equal in length, and any point on the second bent section 2522 of the fourth side 252 of the second side wall 250 to the third side 251 The shortest distances are not equal in length, and the shortest distances gradually increase closer to the junction of the first sidewall 240 and the second sidewall 250 . It is worth noting that the first bending section 2422 of the second side 242 of the first side wall 240 is bent from the first intersection point I1 to the direction where the first side wall 240 and the second side wall 250 meet, and the second The second bending section 2522 of the fourth side 252 of the two sidewalls 250 is bent from the second intersection point I2 to the direction where the first sidewall 240 and the second sidewall 250 meet, so that the first bending section 2422 and the second sidewall 250 are bent. The second bent section 2522 intersects at a first end point P1.

The lower edge of the skirt 270 is connected to the second surface 220 and corresponds to a circular arc 273 where the first side wall 240 and the second side wall 250 meet, and the two sides of the circular arc 273 are connected to the first skirt 271 respectively. and the second skirt 272, and the virtual extension line of the first skirt 271 and the second skirt 272 extends to the junction of the first side wall 240 and the second side wall 250, as shown in Figure 4, will intersect At a virtual second end point P2 , the position of the second end point P2 will be located between the arc 273 and the outer edge 210 of the supporting portion 113 on the second surface 220 . It can be seen from this that if the second surface 220 is at a right angle to the corner 114 , the position of the right angle is at the second end point P2 of the virtual end point. In terms of three-dimensional structure, the connection between the arc 273 and the first side wall 240 and the second side wall 250 is substantially a part of a spherical surface, and this part of the spherical surface protrudes into the bearing part 113 at the first end point P1, as shown in the figure As shown in FIG. 3A and FIG. 4 , a truncated corner of the optical film 120 is cut to avoid the connector 151 and avoid interference between the optical film 120 and the connector 151 . The partially spherical structure can cover the truncated cutting edge 122 of the optical film 120 to prevent bright lines caused by the cutting edge 122 concentrating light. In other words, the projected position of the truncated cutting edge 122 of the optical film 120 on the second surface 220 is located between the arc angle and the outer edge 210 of the carrying portion 113 .

It is worth noting that the closer the distance from the midpoint P4 on the arc 273 to the second virtual end point P2 is, the worse the bright line effect is produced by the cutting edge 122 that blocks the truncated corner of the optical film 120 , and vice versa. However, it can still be adjusted according to the route of the optical path and the model of the display device, so as to achieve the best effect of shielding light leakage and improve the display quality of the display device.

In addition, the design of the corner 114 of the frame 110 is not limited to the corner corresponding to the connector 151 of the light source module 150 , and can also be arranged at other corners of the frame 110 . In other words, more than one corner can also be designed for this invention, depending on the needs of users. The above embodiments can also be applied to the embodiments of the direct-type light source module not shown in the figure.

The present invention has been described by the above-mentioned related embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, modifications and equivalent arrangements included in the spirit and scope of the claims are included in the scope of the present invention.

Claims (9)

1. A framework, characterized in that, comprising: a frame; and A bearing part, the frame is located on the periphery of the bearing part and the frame is connected to the bearing part, the bearing part has a first surface and a second surface opposite to the first surface, the first surface corresponds to the A corner of the bearing part is a right angle, the second surface is an arc angle corresponding to the corner, and the position of the arc angle projected on the first surface is between the right angle and the outer edge of the bearing part; Wherein, the carrying portion has a first side wall, a second side wall and a skirt, the first side wall and the second side wall meet at the corner, and the first side wall has a first side and a second side, the first side is connected to the first side and the second side is connected to the upper edge of the skirt, the second side wall has a third side and a fourth side, the third side It is connected with the first surface and the fourth side is connected with the upper edge of the skirt, and the lower edge of the skirt is connected with the second surface. 2. The frame according to claim 1, wherein the first side and the third side are perpendicular to each other. 3. The frame according to claim 1, wherein the second side has a first intercept point, a first horizontal section and a first bent section, the first intercept point is located on the first horizontal section and the first bending section, the shortest distance from any point on the first horizontal section to the first side is equal in length, and the shortest distance from any point on the first bending section to the first side is unequal in length, And the shortest distance at the corner increases gradually. 4. The frame according to claim 1, wherein the fourth side has a second intercept point, a second horizontal section and a second bent section, and the second intercept point is located on the second horizontal section and the second bending section, the shortest distance from any point on the second horizontal section to the first side is equal in length, and the shortest distance from any point on the second bending section to the first side is unequal in length, And the shortest distance at the corner increases gradually. 5. The frame according to claim 1, wherein the lower edge of the skirt is a circular arc at the corner. 6 . The frame according to claim 4 , wherein the first bent section intersects the second bent section at a first end point. 7. The frame according to claim 5, wherein the lower edge of the skirt has a first skirt and a second skirt, the first skirt and the second skirt are located at the arc The two sides are connected to the arc, the virtual extension lines of the first skirt and the second skirt intersect at a second end point at the corner, and the second end point is located outside the arc and the bearing part between margins. 8. The frame according to claim 5, wherein a portion of a spherical surface is formed where the arc meets the first side wall and the second side wall, and the portion of the spherical surface extends toward the first end point to the Protruding inside the frame. 9. A backlight module, characterized in that, comprising: a frame according to claim 1; An optical film, the optical film has a truncated corner, and the projection position of the cutting edge of the truncated corner is located between the arc corner and the outer edge of the bearing part; and A light source module, a connector of the light source module is disposed under the corner.