CN200997036Y - Positioning device for light guide plate - Google Patents

Abstract

A locating device of light conducting plate is prepared as setting top-making part at two ends of lamp reflector of surface light source device to let light incoming surface of light conducting plate be supported against top-making part when light conducting plate is embedded in lamp reflector.

Description

Positioning device for light guide plate

【Technical field】

The utility model relates to a positioning device for a light guide plate, in particular, without adding additional parts, the light guide plate of the surface light source device can be positioned quickly and accurately, and can protect the light source and prevent the light source from breaking Damaged structure.

【Background technique】

Liquid crystal display (LCD; Liquid Crystal Display) is mainly composed of a liquid crystal panel (LCD panel) and a light source device (Back Light Module). When displaying, the light source used must be provided by means of a surface light source device, which is sufficient for a surface light source device to be an extremely important and indispensable part in a liquid crystal display.

Known surface light source device 1, please refer to shown in Fig. 1, this surface light source device 1 comprises a supporting frame 11, a reflection film 12, a light guide plate 13, diffusion film 14, prism sheet 15, light source 16 ( Take the cold cathode lamp tube as an example) and the lamp reflector 17 among the figure.

The supporting frame 11 has a chassis 111, and a board wall 112 is formed on the periphery of the chassis 111, and a housing area 113 is formed by the chassis 111 and the board wall 112, wherein, the side of the supporting frame 11 is provided with One or more grooves 114 for positioning the light guide plate 13 .

The reflective film 12 mainly enables the light source to be fully utilized to improve the phenomenon of light leakage.

The light guide plate 13 is made of a plate body with a good light-transmitting material. The light guide plate 13 has a light-emitting surface 131 and a reflective surface 132 opposite to the light-emitting surface 131, and at least one end surface is set as a light-incoming surface. 133, the surface of the reflective surface 132 is provided with a large number of light guide points 1321, and the area size of these light guide points 1321 is enlarged according to the farther away from the light source, or the farther away from the light source 16. The density of the light guide points 1321 is increased, wherein the side of the light guide plate 13 is provided with lugs 134 corresponding to the grooves 114 of the receiving frame 11 .

The diffusion film 14 is placed on the top of the light guide plate 13, and its main purpose is to improve the use efficiency of light and make the light source of the light source 16 uniform.

The prism sheet 15 is used to correct the direction of the light so as to achieve the effect of concentrating light and improve the brightness of the front.

The light source 16 is arranged on the outside of the light incident surface 133. The light source 16 may be light emitting diode (LED) or cold cathode lamp (CCFL).

The lamp reflector 17 is a cover with an opening. The lamp reflector 17 is disposed on one side of the lamp source 16 and can reflect the light emitted by the lamp source 16 into the light guide plate 13 .

Please refer to FIG. 2 , when the known surface light source device 1 is assembled, the light source 16 and the lamp reflector 17 are first arranged on one side of the supporting frame 11, and the reflective film 12 is placed on the supporting frame 11. Place the light guide plate 13, the diffuser film 14, and the prism sheet 15 in the supporting frame 11 in sequence, by means of the groove 114 provided on the periphery of the supporting frame 11 and the lug 134 of the light guiding plate 13 Nested with each other, so that the light guide plate 13 can obtain a good positioning, as shown in FIG. 3 .

Generally, the surface light source device using the flat light guide plate 13 can still achieve the positioning effect of the light guide plate 13 by the above-mentioned method, but most notebook computers are light and thin, and the receiving frame 11 is not redundant. The groove 114 is provided in space for the positioning of the lug 134 of the light guide plate 13 .

Therefore, the light guide plate that is generally used in the surface light source device used in notebook computers is usually a wedge-shaped light guide plate. Please refer to FIG. , a light guide plate 23 , a diffusion film 24 , a prism sheet 25 , a light source 26 , and a light reflector 27 .

The supporting frame 21 has a chassis 211 , and a board wall 212 is formed on the periphery of the chassis 211 , and an accommodating area 213 is formed by the chassis 211 and the board wall 212 .

The reflective film 22 mainly enables the light source to be fully utilized to improve the phenomenon of light leakage.

The light guide plate 23 is made of a plate body with a good light-transmitting material. The light guide plate 23 has a light-emitting surface 231 and a reflective surface 232 opposite to the light-emitting surface 231, and at least one end surface is set as a light-incoming surface. 233, the surface of the reflective surface 232 is provided with a large number of light guide points 2321, and the area size of the light guide points 2321 is enlarged according to the farther away from the light source, or the farther away from the light source 26. The density of the light guide points 2321 should be increased.

The diffusion film 24 is placed on the top of the light guide plate 23 , and its main purpose is to improve the use efficiency of light and make the light source of the light source 26 uniform.

The prism sheet 25 is used to correct the direction of the light, so as to achieve the effect of concentrating light and improve the brightness of the front.

The light source 26 is disposed outside the light incident surface 233 .

The lamp reflector 27 is a cover with an opening. The lamp reflector 27 is disposed on one side of the lamp source 26 and can reflect the light emitted by the lamp source 26 into the light guide plate 23 .

Please refer to FIG. 5 again. When the surface light source device 2 is assembled, the light source 26 and the lamp reflector 27 are arranged on one side of the supporting frame 21, and then the reflective film 22 is placed on the supporting frame 21. on the chassis 211 of the light guide plate 23, and place the light guide plate 23, the diffusion film 24, and the prism sheet 25 in the supporting frame 21 in sequence. The electrodes 261 at the two ends are used to make the light guide plate 23 achieve a positioning effect. Because the precision and luminance of the wedge-shaped light guide plate 23 are higher than the general flat light guide plate 13, the wedge-shaped light guide plate 23 is quite wide. It has to be applied to the surface light source device of the notebook computer.

However, since the wedge-shaped light guide plate 23 cannot be provided with positioning lugs on the side, the purpose of positioning the light guide plate 23 can only be achieved by the electrodes 261 at the two ends of the light source 26, and the electrodes 261 at the two ends of the light source 26 have Made of elastic soft material, when the light guide plate 23 is installed, it is very easy to generate excessive pressure or impact force on the electrode 261 due to improper application of force, and then cause the light source 26 to break, thereby increasing the defectiveness of the product. Rate.

In view of the fact that the wedge-shaped light guide plate 23 does not have a good positioning method, and the light source is often broken due to the pressure of the light guide plate, it is necessary to improve this part.

【Content of utility model】

The purpose of this utility model is to provide a positioning device for the light guide plate, which is formed with top parts at the two ends of the lamp reflector of the surface light source device, so that when the light guide plate is embedded in the lamp reflector, the position of the light guide plate The light incident surface can be pressed against the top part, so that the light guide plate of the surface light source device can be quickly and accurately positioned without adding additional parts.

Another object of the present utility model is to provide a positioning device for the light guide plate, by forming a top part at the two ends of the lamp reflector, and the top part can just cover the electrodes of the light source, so that the light guide When the light plate is assembled, the light guide plate will not directly abut against the electrode portion of the light source, so as to protect the electrode of the light source and prevent the light source from being broken and damaged.

In order to achieve the above purpose, the utility model provides a positioning device for a light guide plate, the positioning device is applied to a surface light source device, and the surface light source device at least includes:

A supporting frame, the supporting frame has a chassis, and a board wall is formed on the periphery of the chassis to form a containing area;

A light guide plate has a light-emitting surface and a reflective surface opposite to the light-emitting surface, and at least one end surface is set as a light-incident surface;

a light source is arranged outside the light incident surface; and

A lamp reflector, which is a cover with an opening and reflection function, is characterized in that: the two ends of the lamp reflector are provided with top parts, so that when the light guide plate is embedded in the lamp reflector, the incident light of the light guide plate The surface abuts against the top part, so that the light guide plate of the surface light source device can be accurately positioned without adding additional parts.

In the positioning device of the light guide plate, the top part is formed by directly bending the body above the lamp reflector.

In the positioning device of the light guide plate, the top part is just able to cover the electrodes of the light source.

To sum up, the effect of the present utility model is that the two ends of the lamp reflector of the surface light source device are provided with top parts, so that when the light guide plate is embedded in the lamp reflector, the light incident surface of the light guide plate is in the When it is desired to be positioned, it can be pushed against the top part, so that the light guide plate of the surface light source device can be positioned quickly and accurately without adding additional parts, and the light source can be prevented from being damaged due to improper pressure of the light guide plate. cause cracking and damage.

【Description of drawings】

FIG. 1 is an exploded perspective view of a conventional surface light source device.

FIG. 2 is a schematic diagram of an assembly of a conventional surface light source device.

FIG. 3 is a schematic diagram of a conventional combination of a light guide plate and a supporting frame.

FIG. 4 is an exploded perspective view of another known surface light source device.

FIG. 5 is a combined sectional view of FIG. 4 .

Fig. 6 is a three-dimensional exploded view of the surface light source device of the present invention.

Fig. 7 is a combined schematic view of the surface light source device of the present invention.

【Detailed ways】

In order to make it easier to understand the structure of the utility model and the effect that can be achieved, it is described as follows in conjunction with the drawings:

First, please refer to Fig. 6, the positioning device of the light guide plate of the present invention is mainly applied to the surface light source device, the surface light source device 3 at least includes a supporting frame 31, a reflective film 32, a light guide plate 33. Diffusion film 34, prism sheet 35, light source 36, light reflector 37.

The supporting frame 31 has a chassis 311 , and a board wall 312 is formed around the chassis 311 , and a receiving area 313 is formed by the chassis 311 and the board wall 312 .

The reflective film 32 mainly enables the light source to be fully utilized to improve the phenomenon of light leakage.

The light guide plate 33 is a wedge-shaped plate body made of a light-transmitting material. The light guide plate 33 has a light-emitting surface 331 and a reflective surface 332 opposite to the light-emitting surface 331. At least one end surface is provided as an entrance. The light surface 333, wherein, the surface of the reflective surface 332 is provided with a large number of light guide points 3321, and the area size, density, shape, etc. of the light guide points 3321 are injected into the light guide plate 33 according to the light source of the light source 36. , the performance of the light field determines the layout conditions of the light guide points 3321 .

The diffusion film 34 is placed above the light-emitting surface 331 of the light guide plate 33 , which is mainly used to improve the efficiency of light use and to make the light source of the light source 36 uniform.

The prism sheet 35 is used to correct the direction of the light, so as to achieve the effect of concentrating light and improve the brightness of the front.

The light source 36 is disposed outside the light incident surface 333 .

The lamp reflector 37 is a cover with an opening and reflection function. The lamp reflector 37 covers one side of the lamp source 36 so that the light emitted by the lamp source 36 can be reflected and guided into the light guide plate 33, wherein, Two ends of the lamp reflector 37 are provided with a top part 371. The top part 371 is formed by forming a cut on the body above the opening of the lamp reflector 37 and then directly bending it.

When the surface light source device 3 of the present utility model is assembled, the light source 36 and the lamp reflector 37 are arranged on one side of the supporting frame 31, and the reflective film 32 is placed on the chassis 311 of the supporting frame 31, and Place the light guide plate 33, the diffuser film 34, and the prism sheet 35 in the supporting frame 31 in sequence. At this time, the light incident surface 333 of the light guide plate 33 will be against the top part 371 of the lamp reflector 37, and It will not be in direct contact with the electrode 361 of the light source 36, as shown in FIG. 7 .

The effect of the present utility model is that the two ends of the lamp reflector 37 of the surface light source device 3 are provided with top parts 371, so that when the light guide plate is embedded in the lamp reflector 37, the light incident surface 333 of the light guide plate 33 When it is desired to be positioned, it can be pushed against the top part 371, so that the light guide plate 33 of the surface light source device 3 can be positioned quickly and accurately without adding additional parts, and the light source 36 can be prevented from being guided. Improper compression of the light board 33 causes cracking and damage.

To sum up, the utility model can indeed obtain a better positioning of the light guide plate in the surface light source device, and maintain the stability of the position of the light guide plate at any time, and has not been seen in the market, but has industrial applicability and novelty and progress.

[Description of main component symbols]

1 surface light source device 11 mounting frame 111 chassis

                                                                                                              

                                                                                                    

                                                        

                                                                                 

                                                                                             

                                                                                                   

                                                                                                 

                                   

2-side light source device 21 mounting frame 211 chassis

212 Board Wall 213 Rong Shi District

                                                                                 

                                                                             

                                                                                   

                                                                   

                                                                                                      

                    27 lamp reflectors

3-sided light source device 31 mounting frame 311 chassis

                                                                                                                           

                                                                 

                                                                             

                                                                                         

                                                                         

                                                                                                                        

                                                                                                           

Claims (3)

1. A positioning device for a light guide plate, the positioning device is applied to a surface light source device, and the surface light source device at least includes: A supporting frame, the supporting frame has a chassis, and a board wall is formed on the periphery of the chassis to form a containing area; A light guide plate has a light-emitting surface and a reflective surface opposite to the light-emitting surface, and at least one end surface is set as a light-incident surface; a light source is arranged outside the light incident surface; and A lamp reflector, which is a cover with an opening and reflection function, is characterized in that: the two ends of the lamp reflector are provided with top parts, the light guide plate is embedded in the lamp reflector, and the light incident surface of the light guide plate touches the top on the top system. 2. The positioning device of the light guide plate according to claim 1, wherein the top part is formed by directly bending the body above the lamp reflector. 3. The positioning device of the light guide plate according to claim 1, wherein the top part covers the electrodes of the light source.

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