CN101988659B - Side light type backlight module - Google Patents

Abstract

The invention relates to a side light type backlight module. Specifically, the side-light type backlight module comprises a shell, a light source and a backlight module, wherein the shell defines an accommodating space and is provided with a side frame strip; a light guide plate accommodated in the accommodating space of the housing and having a side plate edge facing the side frame strip; a light emitting unit disposed on the side frame strip and including a plurality of light emitting diodes facing the side plate edge of the light guide plate; the reflecting sheet is arranged on one side plate surface of the light guide plate and is provided with an extending part which extends out of the light guide plate and faces the side plate edge of the light emitting unit; and the light-emitting diodes are arranged between the extension part of the reflector plate and the reflecting surface of the light-reflecting piece. Therefore, the effect of reflecting the light-emitting unit can be achieved through the reflecting sheet and the reflecting surface of the reflecting piece, so that the lampshade can be omitted, and the reflecting piece can be a local structure of the shell.

Description

Edge-lit backlight module

technical field

The present invention relates to a side-light backlight module, in particular to a light source reflection structure of the side-light backlight module.

Background technique

Referring to Fig. 1, it is a kind of backlight module 1 disclosed by China Taiwan New Certificate No. M356138, which includes a frame 11, a light guide plate 12 arranged in the frame 11, a reflector 13 arranged on the bottom surface of the light guide plate 12, a The lamp tube 14 is arranged on the frame 11 and faces to the side edge of the light guide plate 12 , and the lamp tube 14 is positioned by being arranged in a lampshade 15 .

Generally, the main components of the backlight module are substantially the same as above, and the lampshade 15 not only positions the lamp tube 14 , but also serves to reflect the light of the lamp tube 14 and project it onto the light guide plate 12 .

Therefore, there is a need for a backlight module that omits the aforementioned lampshade.

In addition, such as the LED backlight module disclosed in Taiwan's new certificate number M319429, the light source of the previous backlight module is changed from a cold cathode lamp to a light-emitting diode. However, although the light-emitting diode has high efficiency, it often has the problem of heat dissipation. The lifespan of LEDs is related to their temperature. When LEDs are exposed to high temperatures for a long time due to poor heat dissipation, their lifespans are likely to be shortened. Therefore, when LEDs are used as light sources for backlight modules, heat dissipation is also a problem that needs to be solved.

Contents of the invention

An object of the present invention is to provide a backlight module that omits the aforementioned lamp shade (Lamp Reflector).

Another object of the present invention is to provide a backlight module that utilizes LEDs as a backlight source and provides an effective heat dissipation mechanism.

Therefore, the present invention includes a casing and a Light Guide Plate, a Reflector Sheet and a reflector disposed on the casing. Wherein, the housing defines an accommodating space for accommodating the light guide plate and the reflective sheet and has a side frame bar. When the light guide plate is accommodated in the accommodating space of the housing, the side edge Facing the side frame strip, the reflective sheet is arranged on one side of the light guide plate and has an extension extending beyond the edge of the side plate of the light guide plate toward the light-emitting unit, and the reflective member has a As for the reflective surface capable of reflecting light, the light-emitting unit has a plurality of light-emitting diodes interposed between the extension of the reflective sheet and the reflective surface of the reflective member.

Specifically, the present invention provides an edge-lit backlight module, comprising: a housing defining an accommodating space and having a side frame; a light guide plate accommodated in the accommodating space of the housing and a The side plate edge faces the side frame strip; a light emitting unit is arranged on the side frame strip and includes a plurality of light-emitting diodes facing the side plate edge of the light guide plate; a reflector is arranged on the side plate surface of the light guide plate And there is an extension extending beyond the light guide plate toward the edge of the side plate of the light emitting unit; and a reflective member, which has a reflective surface spaced from the reflective sheet and can reflect light, and the light emitting diodes are between the reflective between the extension of the sheet and the reflective surface of the reflective member.

An advantage of the present invention is that the light from the light-emitting diodes can be reflected into the light guide plate by virtue of the extended portion of the reflective sheet and the reflective surface of the reflective member being located on opposite sides of the light-emitting diodes, thereby replacing the light reflected by the conventional lampshade. The function of the light-emitting unit can be provided by the side frame of the housing, which can replace the function of the previous lampshade for fixing the light-emitting unit. Combining the above two points, the present invention can save the setting of the lampshade.

Another feature of the present invention is that the reflector is connected to the side frame of the casing and is a partial structure of the casing.

Another feature of the present invention is that the edge-lit backlight module further includes an outer frame and a heat dissipation block, and the outer frame is combined with the side frame bar of the housing so that the light-emitting unit is interposed between the light guide plate and the frame bar. Between the flexible circuit board and the frame, the heat sink is in contact with the flexible circuit board and the frame. The frame is preferably a metal material with good thermal conductivity. Arranged between the outer frame and the flexible circuit board, the heat energy generated by the light-emitting diodes can be conducted to the outer frame and dissipated from the outer frame, thereby providing a heat dissipation mechanism for the light-emitting unit.

Description of drawings

Fig. 1 is a perspective view of a backlight module with a new certificate number M356138 in Taiwan, China;

Fig. 2 is a three-dimensional sectional view of a preferred embodiment of the edge-lit backlight module of the present invention;

Fig. 3 is an enlarged view of a local position at A in Fig. 2;

Fig. 4 is a perspective view of the combination of the casing and the light emitting unit of the preferred embodiment;

Fig. 5 is in Fig. 4, the partial enlarged view of place B;

Fig. 6 is a plan view of the combination of the casing and the light emitting unit of the preferred embodiment;

Fig. 7 is a partial enlarged view at C in Fig. 6;

Fig. 8 is a partially enlarged view of another embodiment of the second cavity and the heat dissipation block of the housing of the present invention; and

FIG. 9 is a perspective cross-sectional view of another embodiment of the reflective member of the edge-lit backlight module of the present invention.

Description of main component symbols:

2 side-lit backlight module 241 flexible circuit board

21 Shell 242 Light-emitting diode

210 Accommodating space 25 Outer frame

211 Side frame strip 251 First wall

212 slot 252 second wall

213 First recess 26 Reflective piece

214 Second cavity 260 Body

214’ second pocket 261 reflective surface

215 top surface 26’ reflective piece

22 Light guide plate 260’ body

221 One side edge of light guide plate 261’ Reflective surface

23 reflective sheet 262 suppress shoulder

231 Extension part 27 Heat sink

24 Light-emitting unit 27’ Heat sink

Detailed ways

The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings.

2 and 3, a preferred embodiment of the edge-lit backlight module 2 of the present invention includes a housing 21, a light guide plate 22 disposed on the housing 21, a reflector 23, a light emitting unit 24, and a Combined with the outer frame 25 of the casing 21, a reflector 26, and a plurality of cooling blocks 27, of course, the side-light backlight module of the present invention also includes other optical components such as a diffuser, a liquid crystal panel, and the like. The side-light type referred to in the present invention means that the light-emitting unit 24 is located on one edge of the light guide plate 22 .

Referring to Fig. 3 to Fig. 7, the housing 21 is generally frame-shaped and has a side frame bar 211, the side frame bar 211 has a top surface 215, and the housing 21 defines an accommodating space 210, the accommodating space 210 can provide The light guide plate 22 and the reflector 23 are housed inside, and as shown in FIG. Facing the edge 221 of the light guide plate 22 .

The side frame bar 211 is recessed to form a slot 212 along its length direction, and the top surface 215 of the side frame bar 211 is also recessed to form a plurality of first recesses 213 and second recesses 214 along its length direction, each The first cavity 213 communicates with the slot 212 and the accommodating space 210, and each second cavity 214 communicates with the first cavity 213 through the slot 212, and each connected first cavity 213 communicates with the second cavity 213. The recess 214 runs through the side frame bar 211 .

The light-emitting unit 24 includes a strip-shaped flexible circuit board 241 and a plurality of light-emitting diodes 242 arranged on the flexible circuit board 241 at intervals. The numbers can vary depending on different optical conditions. The light emitting unit 24 is arranged on the side frame bar 211 of the housing 21 and spaced from the side plate edge 221 of the light guide plate 22, and wherein the flexible circuit board 241 is accommodated in the slot 212 of the side frame bar 211, and the light emitting diodes 242 are respectively accommodated in the first recesses 213, and the light emitting diodes 242 are directed toward the light guide plate 22, so that the light of the light emitting diodes 242 can project light toward the side plate edge 221 of the light guide plate 22, and in this embodiment Among them, one end of the flexible circuit board 241 extends out of the housing 21 from one end of the side frame bar 211, and the exposed end of the flexible circuit board 241 is directly connected to a DC power supply (DC power, not shown in the figure). Wire connection, therefore, can save the setting of wires. In addition, because the light-emitting unit 24 of the present invention uses LEDs 242 instead of CCFLs, it can also save the setting of a backlight module converter (inverter).

3, the reflection sheet 23 is located on one side of the light guide plate 22, and the length of the reflection sheet 23 is longer and has an extension 231 that extends beyond the light guide plate 22 toward the side edge 221 of the side frame bar 211. In this embodiment, the extension portion 231 extends to one side of the light emitting diode 242 of the light emitting unit 24 .

The reflective member 26 has a reflective surface 261 that is spaced from the reflective sheet 23 and can reflect light, so that the light emitting diodes 242 of the light emitting unit 24 are located between the extension 231 of the reflective sheet 23 and the reflective surface 261 of the reflective member 26. In this embodiment, the reflective member 26 is arranged on the side of the light emitting unit 24 opposite to the extension portion 231 of the reflective sheet 23 and has a body 260 integrally connected with the side frame bar 211 of the housing 21, and the reflective surface 261 is One side surface of the body 260 , in other words, the reflective member 26 is a partial structure of the casing 21 , and the longitudinal section of the connected reflective member 26 and the side frame bar 211 is roughly L-shaped. In this embodiment, the housing 21 is made of a white reflective material (such as PC XQ83619 produced by DOW CHEMICAL, USA), so that the reflective surface 261 of the reflective member 26 has reflective properties.

Referring to Fig. 3 and Fig. 5, in this embodiment, the reflective surface 261 is directly facing the first recesses 213 of the side frame strip 211, and the reflective surface 261 is respectively recessed to form a recess corresponding to each first recess 213. The pressing shoulders 262 are upside down and L-shaped. When the light emitting unit 24 is arranged on the side frame bar 211 of the housing 21, the pressing shoulders 262 can just respectively press the light emitting diodes accommodated in the first cavity 213. One side of the diode 242 thus has the effect of assisting the positioning of the light emitting unit 24 .

The longitudinal section of the outer frame 25 is roughly U-shaped and has two spaced first wall portions 251 and a second wall portion 252 connecting the two first wall portions 251. The outer frame 25 is formed by the two first wall portions 251 respectively. Located on the outside of the reflective sheet 23 and the reflective member 26, the second wall portion 252 faces the side frame bar 211, so that the side frame bar 211 is located between the light guide plate 22 and the second wall portion 252 of the outer frame 25 and is combined with the casing. 21, and the reflective sheet 23 and the housing 21 are clamped between the outer frame 25 in a U-shaped structure, so that the extensions 231 of the reflective member 26 and the reflective sheet 23 are respectively located on both sides of the light-emitting unit 24, and on the light guide plate 22 and the light-emitting unit 24 to form an internal space to ensure that the light reflected by the extension 231 of the reflector 23 and the reflective surface 261 of the reflector 26 is completely projected into the light guide plate 22 to avoid light leakage. Preferably, the material of the outer frame 25 may be a metal material with better thermal conductivity.

In this embodiment, the light from the light emitting diode 242 can enter the light guide plate 22 in roughly four ways, the first is directly entering from one side edge 221 of the light guide plate 22, and the second is through the extension of the reflective sheet 23 231 into the light guide plate 22, the third is reflected into the light guide plate 22 through the reflective surface 261 of the reflector 26, and the fourth is that the light toward the side edge 221 of the light guide plate 22 will be reflected to the side frame bar 211 The top surface 215 is then reflected by the top surface 215 of the side light bar 211 and enters the light guide plate 22 from one side edge 221 of the light guide plate 22 . Therefore, in addition to the structural design of the side frame bar 211 for fixing the light emitting unit 24 , the top surface 215 also has the effect of reflecting light.

Referring to Fig. 3, Fig. 5 and Fig. 7, the heat dissipation blocks 27 are respectively located in the second cavity 214 of the side frame bar 211 and contact the flexible circuit board 241 of the light emitting unit 24 and the second wall of the outer frame 25 at the same time. 252 inner surface, in this embodiment, the heat dissipation block 27 may be pre-fixed on the side of the flexible circuit board 241 opposite to the side where the light emitting diodes 242 are disposed. The heat conduction block 27 can be a material or a heat conduction pad with better thermal conductivity. When the light emitting diode 242 on the light emitting unit 24 emits light to generate heat energy, the heat dissipation block 27 is in contact with the flexible circuit board 241 and the outer frame 25 at the same time. The heat energy of the light emitting unit 24 is conducted to the outer frame 25 and dissipated from the outer frame 25 , which helps to improve the heat dissipation efficiency of the light emitting unit 24 .

Regarding the structure of the second concave cavity 214 and the heat dissipation block 27 in FIG. These first recesses 213 communicate, so that the first recess 213 passes through the side frame bar 211 by communicating with the second recess 214', and the cooling block 27' is a strip-shaped structure that is accommodated in the second recess. The cavity 214', the flexible circuit board 241 is also accommodated in the second cavity 214', and the heat dissipation block 27' is interposed between the flexible circuit board 241 and the outer frame (similar to FIG. 3), thereby increasing the heat dissipation block The contact area between 27 ′ and the flexible circuit board 241 and the outer frame achieves a better heat dissipation effect. Of course, the block-shaped structure of the aforementioned heat dissipation block 27 also has the advantage of reducing costs.

It is supplemented that, in the foregoing embodiments, the reflective surface 261 of the reflective member 26 is one side surface of the main body 260, but in another embodiment, referring to FIG. 9, the reflective member 26' has a main body 260', and The reflective surface 261' is formed by a reflective sheet attached to the surface of the main body 260', which can also achieve the same effect as described above. The reflective sheet used here can be a highly reflective material patch produced by Mitsui Chemicals, Mitsubishi Highly reflective material patches produced by resin, etc., the base material is mainly PP or PET.

In summary, the present invention can simultaneously reflect the light of the light-emitting unit 24 by extending the length of the reflector 23, and then cooperate with the reflective member 26 formed by the structure of the housing 21 to reflect the light of the light-emitting unit 24, which can replace In the past, the photomask has the function of reflecting the light source. In addition, the casing 21 can also provide a fixed light-emitting unit 24 through the structure of the above-mentioned reflector. In this way, the installation of the photomask can be omitted. Furthermore, the present invention also provides heat dissipation blocks 27, 27' between the light-emitting unit 24 and the outer frame 25, so that the heat energy generated by the light-emitting unit 24 can be dissipated from the outer frame 25, thereby providing a light-emitting diode 242 as a light source. The light emitting unit 24 is a heat dissipation mechanism, thereby prolonging the life of the light emitting diode 242, so the object of the present invention can indeed be achieved.

But the above-mentioned ones are only preferred embodiments of the present invention, and should not limit the scope of the present invention with this, that is, all simple equivalent changes and modifications made according to the claims of the present invention and the content of the description of the invention, All still belong to the scope that the patent of the present invention covers.

Claims (13)

1. An edge-lit backlight module, comprising: A casing that defines an accommodating space and has a side frame; A light guide plate, accommodated in the accommodation space of the housing, with one side plate edge facing the side frame strip; A light emitting unit is arranged on the side frame and includes a plurality of light emitting diodes facing the side edge of the light guide plate; a reflective sheet disposed on one side of the light guide plate and having an extension extending beyond the edge of the side plate of the light guide plate toward the light emitting unit; and A reflector has a reflective surface that is spaced apart from the reflector and can reflect light. The reflector also has a body that is integrated with the side frame. The light-emitting diodes are connected between the reflector between the extension of the sheet and the reflective surface of the reflective member; Wherein, the body is a body made of reflective material, the reflective surface is the surface of the body, the housing is roughly frame-shaped, and the body is connected with the side frame strips of the housing to form the The partial structure of the casing, and the longitudinal section of the connected side frame strip and the reflective member are roughly L-shaped, and the casing is made of reflective material. 2. The edge-lit backlight module according to claim 1, wherein the reflective surface is formed by a reflective sheet attached to the surface of the main body. 3. An edge-lit backlight module, comprising: A casing that defines an accommodating space and has a side frame; A light guide plate, accommodated in the accommodation space of the housing, with one side plate edge facing the side frame strip; A light emitting unit is arranged on the side frame and includes a plurality of light emitting diodes facing the side edge of the light guide plate; a reflective sheet disposed on one side of the light guide plate and having an extension extending beyond the edge of the side plate of the light guide plate toward the light emitting unit; and A reflector has a reflective surface that is spaced apart from the reflector and can reflect light. The reflector also has a body that is integrated with the side frame. The light-emitting diodes are connected between the reflector between the extension of the sheet and the reflective surface of the reflective member; Wherein, the body is a body made of reflective material, the reflective surface is the surface of the body, the light-emitting unit further includes a flexible circuit board, and the light-emitting diodes are arranged on the flexible circuit board, And one end of the flexible circuit board protrudes from the casing through the side frame strip. 4. The edge-lit backlight module according to claim 3, wherein a strip-shaped slot is formed in the length direction of the side frame strip, and the side frame strip also has a side facing the light guide plate. On the top surface of the side plate edge, the top surface of the side frame bar is also recessed to form a plurality of first recesses spaced along the length direction and communicating with the slot and the accommodating space. The side frame strips, the flexible circuit board are located in the slots, and the light emitting diodes are respectively located in the first recesses. 5. The edge-lit backlight module according to claim 4, wherein the side frame strips are further formed with a plurality of second recesses, and the second recesses are respectively connected to the first recesses through the slots. A cavity is connected, and each connected first cavity and the second cavity pass through the side frame strip, and the side-light backlight module further includes a side frame strip combined with the casing An outer frame and a plurality of heat dissipation blocks, said heat dissipation blocks are respectively accommodated in said second cavities and interposed between said flexible printed circuit board and said outer frame, and are connected to said flexible printed circuit board and said outer frame. contact with the inner surface of the outer frame. 6 . The edge-lit backlight module as claimed in claim 5 , wherein the heat dissipation blocks are fixed on a side of the flexible circuit board opposite to the side where the light emitting diodes are provided. 7. The edge-lit backlight module as claimed in claim 6, wherein each of the first recesses on the reflective surface is respectively recessed to form an upside-down L-shaped pressing shoulder for pressing into the container. One side of the light emitting diode placed in the first cavity. 8. The edge-lit backlight module according to claim 7, wherein the longitudinal section of the outer frame is substantially U-shaped and comprises two spaced apart first wall portions and a first wall portion connecting the first wall portions. Two wall parts, when the outer frame is combined with the side frame bar, the two first wall parts are respectively located outside the reflective sheet and the reflective member, and the side frame bar is between the light guide plate and the light guide plate between the second wall. 9. The edge-lit backlight module according to claim 3, wherein the side frame strip has a top surface facing the side edge of the light guide plate, and the top surface of the side frame strip is along the length direction A plurality of first recesses communicating with the accommodating spaces are recessed at intervals, and a second recess in the shape of a strip and communicating with the first recesses is formed in the longitudinal direction of the side frame bar. , the first cavity passes through the side frame bar through the communication with the second cavity, and the edge-lit backlight module further includes an outer frame combined with the side frame bar of the housing and a An elongated heat dissipation block, the heat dissipation block and the flexible circuit board are both accommodated in the second cavity, and the heat dissipation block is interposed between the flexible circuit board and the outer frame. It is in contact with the flexible circuit board and the inner surface of the outer frame. 10 . The edge-lit backlight module according to claim 9 , wherein the heat dissipation block is fixed on a side of the flexible circuit board opposite to the side where the light emitting diodes are provided. 11 . 11. The edge-lit backlight module as claimed in claim 10, wherein each of the first recesses on the reflective surface is respectively recessed to form an upside-down L-shaped pressing shoulder for pressing on the container. One side of the light emitting diode placed in the first cavity. 12. The edge-lit backlight module according to claim 11, wherein the longitudinal section of the outer frame is roughly U-shaped and comprises two spaced apart first wall portions and a first wall portion connecting the first wall portions. Two wall parts, when the outer frame is combined with the side frame bar, the two first wall parts are respectively located outside the reflective sheet and the reflective member, and the side frame bar is between the light guide plate and the light guide plate between the second wall. 13. The edge-lit backlight module according to claim 3, further comprising an outer frame and at least one cooling block, the outer frame is combined with the side frame strip of the housing, so that the light-emitting unit is interposed between the Between the light guide plate and the outer frame, the heat dissipation block is interposed between the flexible circuit board and the outer frame and is in contact with the flexible circuit board and the outer frame.

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