CN102287708B - Display device and backlight module thereof - Google Patents

Abstract

The invention discloses a display device and a backlight module thereof. The display device includes a display panel with a pixel array and a backlight module used to provide a backlight source to cooperate with the pixel array to present images. The backlight module includes a backplane, at least one light-emitting unit, a first circuit board, and a second circuit board. At least one light-emitting unit is disposed on a surface of the back panel facing the display panel. The first circuit board has at least one current sink unit, and each current sink unit is electrically connected to the corresponding light-emitting unit. The second circuit board has a DC/DC converter electrically connected to at least one current sink unit.

Description

Display device and backlight module thereof

technical field

The invention relates to a display device and a backlight module thereof, in particular to a display device and a backlight module capable of reducing the area requirement of a circuit board.

Background technique

Flat Panel Display (FPD) is a widely used display at present. It has the advantages of light and thin appearance, power saving and low radiation, so it is widely used in computer screens, mobile phones, personal digital assistants (PDAs), Electronic products such as flat-screen TVs. The working principle of the flat panel display device is to display images by changing the light transmittance of the pixels and matching the light source provided by the backlight module. That is to say, the backlight module is a key component for the display operation of the flat panel display device. FIG. 1 is a schematic diagram of a known backlight module. As shown in FIG. 1 , the known backlight module 100 includes a backplane 101, a plurality of light emitting units (not shown) disposed on the first surface of the backplane 101, and a printed circuit board disposed on the second surface of the backplane 101. 110 , wherein the printed circuit board 110 has a plurality of current sink units 111 and DC/DC converters 112 . A plurality of light-emitting units are connected to the printed circuit board 110 through conductive wires 190, such as flexible flat cables (Flexible Flat Cable; FFC). Usually, the backplane 101 has a plurality of openings 120, and each conductive wire 190 passes through the corresponding opening 120. To connect the printed circuit board 110 with the corresponding light emitting unit. However, as the size of the display panel increases, the number of conductive lines 190 will increase due to the increase in the number of light-emitting units. In addition, in order to match the arrangement of the light-emitting units, the area of the printed circuit board 110 will be significantly increased accordingly. would result in high production costs. In addition, if the printed circuit board 110 with the current combining unit 111 and the DC/DC converter 112 occupies too much space on the second surface of the backplane 101, the space for setting the circuit board with other functional units will be limited, resulting in Inconvenient design.

Contents of the invention

According to an embodiment of the present invention, a backlight module is disclosed, which includes a backplane, at least one light emitting unit, a first circuit board, and a second circuit board. The at least one light emitting unit is disposed on a surface of the backplane. The first circuit board has at least one current-combining unit, and each current-combining unit is electrically connected to a corresponding light-emitting unit. The second circuit board has a DC/DC converter electrically connected to the at least one current sink unit.

According to an embodiment of the present invention, a display device is disclosed, which includes a display panel with a pixel array and a backlight module for providing a backlight to cooperate with the pixel array to display images. The backlight module includes a backboard, at least one light emitting unit, a first circuit board and a second circuit board. The at least one light emitting unit is disposed on the surface of the backplane facing the display panel. The first circuit board has at least one current-combining unit, and each current-combining unit is electrically connected to a corresponding light-emitting unit. The second circuit board has a DC/DC converter electrically connected to the at least one current sink unit.

In the present invention, at least one current converging unit and the DC/DC converter are respectively arranged on different circuit boards to avoid wasting the area of the circuit board, thereby reducing the production cost and freeing up more board space to facilitate the installation of circuits with other functional units plate.

Description of drawings

FIG. 1 is a schematic diagram of a known backlight module;

2 is a schematic diagram of the basic structure of the display device of the present invention;

3 is a schematic top view of the first embodiment of the backlight module of FIG. 2;

FIG. 4 is a schematic bottom view of the first embodiment of the backlight module of FIG. 2;

Fig. 5 is a schematic sectional view along the A-A line in Fig. 4;

6 is a schematic top view of the second embodiment of the backlight module of FIG. 2;

7 is a schematic bottom view of the second embodiment of the backlight module of FIG. 2;

FIG. 8 is a schematic bottom view of a third embodiment of the backlight module in FIG. 2 .

Among them, reference signs

Detailed ways

In the following, according to the present invention, the display device and its backlight module will be described in detail with specific embodiments together with the accompanying drawings, but the provided embodiments are not intended to limit the scope of the present invention.

FIG. 2 is a schematic diagram of the basic structure of the display device of the present invention. As shown in FIG. 2 , the display device 200 includes a display panel 210 and a backlight module 230 , wherein the display panel 210 has a pixel array 215 , and the backlight module 230 is used to provide a backlight to cooperate with the pixel array 215 to display images. 3 and 4 are schematic top and bottom views of the first embodiment of the backlight module 230 in FIG. 2 , respectively, and FIG. 5 is a schematic cross-sectional view along line A-A in FIG. 4 . As shown in FIGS. 3 to 5 , the backlight module 230_1 includes a backplane 240 , at least one first light emitting unit 251 , at least one first conductive wire 291 , a first circuit board 260 , a second circuit board 270 , and a second conductive wire 292 , and the fourth circuit board 275. The back plate 240 has a first plate surface 241 facing the display panel 210 of FIG. 2 and a second plate surface 242 opposite to the first plate surface 241 . At least one first light emitting unit 251 is disposed on the first surface 241 of the backplane 240 . The first circuit board 260, the second circuit board 270 and the fourth circuit board 275 are arranged on the second board surface 242 of the backplane 240, and the circuit board can be, for example, a printed circuit board (Printed Circuit Board, PCB), a flexible printed circuit board (Flexible Printed Circuit Board, FPCB).

The first circuit board 260 has at least one first current combining unit 261 , and each first current combining unit 261 is electrically connected to the corresponding first light emitting unit 251 through a corresponding first conductive wire 291 . In the embodiment shown in FIGS. 3-5 , the back plate 240 has at least one first opening 245, and each first conductive line 291 passes through the corresponding first opening 245 to connect the corresponding first light-emitting unit 251 and the first light-emitting unit 251. A circuit board 260 . In another embodiment, the back plate 240 can omit the first opening 245, and each first conductive line 291 goes around the side edge of the back plate 240 adjacent to the first circuit board 260 to connect the corresponding first light emitting unit 251 and the first circuit board 260 . The second circuit board 270 has a first DC/DC converter 271 electrically connected to at least one first current sink unit 261, and the first DC/DC converter 271 is used to convert a DC voltage into a voltage suitable for driving the first Another DC voltage of the current sink unit 261 and the first light emitting unit 251 . The second conductive wire 292 is used to connect the first circuit board 260 to the second circuit board 270 , so as to electrically connect the at least one first current sink unit 261 to the first DC/DC converter 271 . The fourth circuit board 275 has a power supply 276 electrically connected to the first DC/DC converter 271 . Please note that the power supply 276 is not limited to supply power to the first DC/DC converter 271 , and can also supply power to other electronic components of the display device 200 in FIG. 2 .

Since each first current pooling unit 261 has only a simple circuit, it can be arranged in a relatively small circuit board space, and the first circuit board 260 designed with the layout of at least one first current pooling unit 261 is placed on the backplane. The second plate surface 242 of the 240 can only occupy a narrow edge area. The first DC/DC converter 271 of the second circuit board 270 can be electrically connected to the first circuit board 260 through the second conductive wire 292, and then transmit power to each first circuit board 260 through the conductive traces on the first circuit board 260. The current sinking unit 261 . In addition, the second circuit board 270 basically only needs to provide the required area for laying out the circuit of the first DC/DC converter 271 , so the length/width of the second circuit board 270 can be significantly smaller than the length/width of the backplane 240 . That is to say, the circuit board area required by at least one first current combining unit 261 and the first DC/DC converter 271 disposed on the second board surface 242 of the backplane 240 can be significantly smaller than the area of the above-mentioned known printed circuit board 110 . In other words, the structure of the backlight module 231_1 of the present invention can avoid the significant waste of circuit board area caused by the prior art that arranges the current sink unit 111 and the DC/DC converter 112 on the same printed circuit board 110, so as to reduce the production cost and save The space on the second board surface 242 is convenient for arranging circuit boards with other functional units (such as the fourth circuit board 275 with a power supply 276 ).

6 and 7 are schematic top and bottom views of the second embodiment of the backlight module 230 in FIG. 2 , respectively. As shown in FIG. 6 and FIG. 7, the backlight module 230_2 includes a backplane 340, at least one first light emitting unit 251, at least one second light emitting unit 252, at least one first conductive wire 291, at least one third conductive wire 293, the first A circuit board 260 , a second circuit board 270 , a third circuit board 280 , a second conductive wire 292 , a fourth conductive wire 294 , and a fourth circuit board 275 . The back plate 340 has a first plate surface 341 facing the display panel 210 of FIG. 2 and a second plate surface 342 opposite to the first plate surface 341 . At least one first light emitting unit 251 and at least one second light emitting unit 252 are disposed on the first plate surface 341 of the back plate 340 . The first circuit board 260 , the second circuit board 270 , the third circuit board 280 and the fourth circuit board 275 are disposed on the second board surface 342 of the back board 340 .

The backlight module 230_2 is basically similar to the backlight module 230_1 shown in FIG. 3 to FIG. 294. The third circuit board 280 has at least one second current combining unit 281 , and each second current combining unit 281 is electrically connected to the corresponding second light emitting unit 252 through a corresponding third conductive wire 293 . In the embodiment shown in FIG. 6 and FIG. 7, the back plate 340 has at least one second opening 246, and each third conductive wire 293 passes through the corresponding second opening 246 to connect the corresponding second light emitting unit 252 and the first second opening 246. Three circuit boards 280 . In another embodiment, the back plate 340 can omit the second opening 246, and each third conductive wire 293 bypasses the side edge of the back plate 340 adjacent to the third circuit board 280 to connect the corresponding second light emitting unit 252 and the third circuit board 280. circuit board 280 . The fourth conductive wire 294 is used to connect the third circuit board 280 to the second circuit board 270 , so as to electrically connect the at least one second current sink unit 281 to the first DC/DC converter 271 . That is to say, both the at least one first current combining unit 261 and the at least one second current combining unit 281 are electrically connected to the first DC/DC converter 271 of the second circuit board 270 .

Similarly, since each second current-combining unit 281 has only a simple circuit, it can be arranged in a relatively small circuit board space, and the third circuit board 280 designed with the arrangement and layout of at least one second current-combining unit 281, The second panel surface 342 of the back panel 340 can only occupy a narrow edge area. Therefore, the first circuit board 260 and the third circuit board 280 are disposed on two opposing narrow edge regions of the second board surface 342 . Based on the above description, it can be seen that the required circuit board area of at least one first current pooling unit 261, at least one second current pooling unit 281 and first DC/DC converter 271 disposed on the second board surface 342 of the backplane 340 Still can be significantly smaller than the area of the known printed circuit board 110, thereby reducing production costs, and can save the space of the second board surface 342 to facilitate the installation of circuit boards with other functional units (such as the fourth circuit board with power supply 276 275).

FIG. 8 is a schematic bottom view of a third embodiment of the backlight module 230 in FIG. 2 . The backlight module 230_3 shown in FIG. 8 is similar to the backlight module 230_2 shown in FIG. 6 and FIG. circuit board 375 . The second circuit board 370 disposed on the second board surface 442 of the backplane 440 has a first DC/DC converter 371 and a second DC/DC converter 372 . The first DC/DC converter 371 is electrically connected to at least one first current sink unit 261 through the second conductive wire 292 . The second DC/DC converter 372 is electrically connected to at least one second current sink unit 281 through the fourth conductive wire 294 . The fourth circuit board 375 disposed on the second surface 442 of the backplane 440 has a power supply 376 , and the power supply 376 is electrically connected to the first DC/DC converter 371 and the second DC/DC converter 372 . Please note that the power supply 376 is not limited to supply power to the first DC/DC converter 371 and the second DC/DC converter 372 , and can also supply power to other electronic components of the display device 200 in FIG. 2 . Since the second circuit board 370 only needs to provide the required area for laying out the circuits of the first DC/DC converter 371 and the second DC/DC converter 372, at least one first The required circuit board area of a current pooling unit 261, at least one second current pooling unit 281, the first DC/DC converter 371 and the second DC/DC converter 372 can still be significantly smaller than that of the above-mentioned known printed circuit board 110 area, so as to reduce the production cost, and save the space of the second board surface 442 to facilitate the installation of circuit boards with other functional units (such as the fourth circuit board 375 with the power supply 376).

Please note that the display device and its backlight module of the present invention are not limited to the above structural design based on at least one first light-emitting unit and/or at least one second light-emitting unit, but can be extended to more groups of light-emitting units with more groups of current The design of the confluence unit. In a word, the present invention arranges at least one current converging unit and the DC/DC converter on different circuit boards to avoid wasting the area of the circuit board, thereby reducing the production cost and freeing up more board space to facilitate the installation of other functional units. circuit board.

Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (18)

1. a backlight module is characterized in that, it comprises:

One backboard has one first plate face;

At least one the first luminescence unit is arranged at this first plate face;

One first circuit board, this first circuit board have at least one the first electric current unit that confluxes and are electrically connected on respectively this at least one the first luminescence unit; And

One second circuit board, this second circuit board have one first DC-DC converter and are electrically connected on this at least one first electric current unit that confluxes.

2. backlight module according to claim 1 is characterized in that, also comprises:

At least one the first conductor wire, each first conductor wire are electrically connected between corresponding this at least one the first luminescence unit and this first circuit board; And

One second conductor wire is electrically connected between this first circuit board and this second circuit board.

3. backlight module according to claim 2 is characterized in that, wherein this backboard also comprises second space of a whole page that is in reverse to this first plate face, and this first circuit board and this second circuit board are arranged at this second plate face.

4. backlight module according to claim 3 is characterized in that, wherein this at least one first conductor wire passes first luminescence unit and this first circuit board of at least one the first opening to connect this correspondence of this backboard.

5. backlight module according to claim 3 is characterized in that, also comprises:

At least one the second luminescence unit is arranged at this first plate face; And

One tertiary circuit plate is arranged at this second plate face, and this tertiary circuit plate has at least one the second electric current unit that confluxes, and this at least one second electric current unit that confluxes is electrically connected on this second circuit board and is electrically connected on respectively this at least one the second luminescence unit.

6. backlight module according to claim 5 is characterized in that, wherein this at least one second electric current unit that confluxes is electrically connected on this first DC-DC converter.

7. backlight module according to claim 5 is characterized in that, wherein this second circuit board also comprises one second DC-DC converter and is electrically connected on this at least one second electric current unit that confluxes.

8. backlight module according to claim 5 is characterized in that, also comprises:

At least one the 3rd conductor wire, each the 3rd conductor wire are electrically connected between corresponding the second luminescence unit and this tertiary circuit plate; And

One the 4th conductor wire is electrically connected between this tertiary circuit plate and this second circuit board.

9. backlight module according to claim 8 is characterized in that, wherein this at least one the 3rd conductor wire passes one second opening of this backboard to connect this correspondence second luminescence unit and this tertiary circuit plate.

10. a display unit is characterized in that, it comprises:

One display floater has a pel array; And

One backlight module is used to provide backlight to cooperate this pel array to present picture, and this backlight module comprises:

One backboard has first a plate face towards this display floater;

At least one the first luminescence unit is arranged at this first plate face;

One first circuit board, this first circuit board have at least one the first electric current unit that confluxes and are electrically connected on respectively this at least one the first luminescence unit; And

One second circuit board, this second circuit board have one first DC-DC converter and are electrically connected on this at least one first electric current unit that confluxes.

11. display unit according to claim 10 is characterized in that, wherein this backlight module also comprises:

At least one the first conductor wire, each first conductor wire are electrically connected between corresponding this at least one the first luminescence unit and this first circuit board; And

One second conductor wire is electrically connected between this at least one first circuit board and this second circuit board.

12. display unit according to claim 11 is characterized in that, wherein:

This backlight module also comprises one the 4th circuit board, and the 4th circuit board has a power supply unit and is electrically connected on this first DC-DC converter; And

This backboard also comprises second a plate face that is in reverse to this first plate face, and this first circuit board, and this second circuit board and the 4th circuit board are arranged at this second plate face.

13. display unit according to claim 12 is characterized in that, wherein this at least one first conductor wire passes at least one first opening of this backboard to connect this correspondence the first luminescence unit and this first circuit board.

14. display unit according to claim 12 is characterized in that, wherein this backlight module also comprises:

At least one the second luminescence unit is arranged at this first plate face; And

One tertiary circuit plate is arranged at this second plate face, and this tertiary circuit plate has at least one the second electric current unit that confluxes, and this at least one second electric current unit that confluxes is electrically connected on this second circuit board and is electrically connected on respectively this at least one the second luminescence unit.

15. display unit according to claim 14 is characterized in that, wherein this at least one second electric current unit that confluxes is electrically connected on this first DC-DC converter.

16. display unit according to claim 14 is characterized in that, wherein this second circuit board also comprises one second DC-DC converter and is electrically connected on this power supply unit and this at least one second electric current unit that confluxes.

17. display unit according to claim 14 is characterized in that, wherein this backlight module also comprises:

At least one the 3rd conductor wire, each the 3rd conductor wire are electrically connected between corresponding the second luminescence unit and this tertiary circuit plate; And

One the 4th conductor wire is electrically connected between this tertiary circuit plate and this second circuit board.

18. display unit according to claim 17 is characterized in that, wherein this at least one the 3rd conductor wire passes at least one second opening of this backboard to connect this correspondence second luminescence unit and this tertiary circuit plate.

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