CN101303477A - Backlight module and liquid crystal display device using same - Google Patents

Abstract

The present invention discloses a backlight module and a liquid crystal display device using the same. The backlight module at least comprises a back plate, a light guide plate and at least one U-shaped lamp tube. The back plate has a front side and a back side opposite to each other, and the light guide plate is arranged on the front side of the back plate. At least one U-shaped lamp tube is arranged around the light guide plate, and two outlet ends of the at least one U-shaped lamp tube are respectively located on two opposite sides of the back plate.

Description

Backlight module and liquid crystal display device using same

technical field

The invention relates to a backlight module and a liquid crystal display device using the same, and in particular to a backlight module capable of improving the leakage current phenomenon of lamp wires and a liquid crystal display device using the same.

Background technique

At present, a general liquid crystal display device is mainly composed of a front-end liquid crystal display panel and a rear-end backlight module. Therefore, besides the liquid crystal display panel, the backlight module is another critical component in the liquid crystal display device.

With the increasing application of liquid crystal display elements, the demand for large-sized liquid crystal display elements also increases accordingly. As the size of the liquid crystal display element increases, the length of wires used to connect various electronic components inside the element also increases accordingly. For example, due to the increase in the size of the display element, the length of the wire connecting the outlet end of the lamp tube of the liquid crystal display element to the connector of the adapter of the power supply module also becomes quite long.

However, as the length of the wire increases, some electrical problems arise. For example, when the wires of the lamp tube are in contact with the backplane made of metal in the backlight module, a parasitic capacitance will be generated, thereby causing leakage current of the wires. Such electrical problems gradually worsen as the length of the wire increases.

Therefore, as the development of large-size liquid crystal display elements has become an inevitable trend in the market, how to effectively improve the leakage current of wires and further effectively use energy has become one of the issues that have to be seriously faced in the development of large-size liquid crystal display elements.

Contents of the invention

In view of various deficiencies in the known technologies, the purpose of the present invention is to provide a backlight module, by designing the shape of the lamp tube, to shorten the distance between the outlet end of the lamp tube and the connector corresponding to the output area of the power supply module, and Thus, the length of the wire connecting the outlet end of the lamp tube and the corresponding connector of the power supply module is effectively shortened. In this way, the parasitic capacitance of the lamp wire can be indeed improved, and then the leakage current of the lamp running wire on the backplane can be relatively improved.

Another object of the present invention is to provide a backlight module with at least one ㄈ-shaped light tube, wherein the outlet ends of the ㄈ-shaped light tube fall on opposite sides of the screen and are adjacent to the power supply module connectors in the output area. Therefore, the leakage current of the wire can be effectively reduced, thereby providing a highly stable light source.

Another object of the present invention is to provide a backlight module having a substantially square lamp tube, wherein the outlet end of the substantially square lamp tube falls on one side of the screen and is adjacent to the power supply module connectors in the output area. Therefore, the length of the wire from the lamp tube to the power supply module can be shortened, thereby effectively improving the utilization rate of the power supply.

Another object of the present invention is to provide a liquid crystal display device, the shape of the lamp tube can be designed according to the position of the connector of the power supply of the backlight module, so as to shorten the distance between the outlet end and the connector of the power supply, and relatively shorten The length of the lead wire of the lamp. Therefore, the leakage current of the wires of the lamp tube can be improved, thereby improving the efficiency of the light source, and further improving the display quality of the liquid crystal display device.

According to the above purpose of the present invention, a backlight module is proposed, which at least includes: a backplane with opposite fronts and backs; a power supply module disposed on the back of the backplane, wherein the power supply module at least includes a high-voltage output area and a low-voltage output area; the light guide plate is set on the front of the back plate; and at least one lamp tube is set on the periphery of the light guide plate, wherein the positions of the two outlet ends of the at least one light tube respectively correspond to and are adjacent to the high-voltage output area and the low-voltage output area , so that the sum of the distances from these outlets to the corresponding high-voltage output area and low-voltage output section is smaller than the sum of the distances from the terminals adjacent to the above-mentioned outlets in the backplane to the high-voltage output area and low-voltage output section.

According to the purpose of the present invention, a liquid crystal display device is proposed, which at least includes a backlight module and a display panel, which are arranged on the backlight module. Wherein, the backlight module at least includes: a backplane with opposite fronts and backs; a power supply module disposed on the back of the backplane, wherein the power supply module at least includes a high-voltage output area and a low-voltage output area; a light guide plate is disposed on On the front of the back plate; and at least one lamp tube, which is arranged on the periphery of the light guide plate, wherein the positions of the two outlet ends of the at least one lamp tube respectively correspond to and are adjacent to the high-voltage output area and the low-voltage output area, so that these outlet ends The sum of the distances to the corresponding high-voltage output area and the low-voltage output section is smaller than the sum of the distances from the terminals adjacent to these outgoing line ends in the backplane to the high-voltage output area and the low-voltage output section. The display panel is disposed on the light guide plate.

According to a preferred embodiment of the present invention, the above-mentioned at least one light tube may include a ㄈ-shaped light tube, two ㄈ-shaped light tubes or a substantially square light tube, and the two outlet ends of these light tubes are preferably located at the back on the central area of the sides of the board.

By designing the shape of the lamp tube so that the two outlet ends of the lamp tube can be matched and adjacent to the output area of the power supply module, the distance between the outlet end of the lamp tube and the output area of the power supply module can be shortened , which can reduce the length of the lead wire of the lamp tube, further reduce the leakage current of the lead wire, and further achieve the purpose of improving the efficiency of the light source.

Description of drawings

FIG. 1 a is a front view of a light tube of a backlight module according to a preferred embodiment of the present invention.

FIG. 1b is a top view of a light tube arrangement of a backlight module according to a preferred embodiment of the present invention.

FIG. 1c is a schematic diagram of the device at the back of a backlight module according to a preferred embodiment of the present invention.

Fig. 2a is a front view of a light tube of a backlight module according to another preferred embodiment of the present invention.

FIG. 2b is a top view of a light tube arrangement of a backlight module according to another preferred embodiment of the present invention.

FIG. 2c is a schematic diagram of the device at the back of a backlight module according to another preferred embodiment of the present invention.

FIG. 3 is a device system diagram of a liquid crystal display device according to a preferred embodiment of the present invention.

Explanation of reference signs

100: Backlight module 102: Backplane

104: Lamp 106: Lamp

108: Outgoing terminal

112: Outgoing end 114: Outgoing end

116: Light guide plate 118: Back

120: Power supply module 122: Outlet hole

124: Outlet hole 126: Connector

128: connector               130: connector

132: connector 134: wire

136: Wire 138: Wire

140: Wire 142: Front

144: Side wall 200: Backlight module

202: Backplane 204: Lamp

206: Light tube 208: Outlet terminal

210: Outgoing terminal 212: Outgoing terminal

214: Outlet end 116: Light guide plate

218: Back 220: Power supply module

222: Outlet Hole 224: Outlet Hole

226: Connector 228: Connector

230: Connector 232: Connector

234: Conductor 236: Conductor

238: Wire 240: Wire

242: Front 244: Side wall

300: Liquid crystal display device 302: Liquid crystal panel

304: Backlight module 306: Backplane

308: reflector 310: light guide plate

312: Light tube 314: Power supply module

316: front frame

Detailed ways

The invention discloses a backlight module and its application, which can effectively improve the parasitic capacitance phenomenon of the lamp wire, and further greatly reduce the leakage current of the lamp wire. In order to make the description of the present invention more detailed and complete, reference may be made to the following description in conjunction with the illustrations in FIG. 1a to FIG. 3 .

Please refer to FIG. 1 a , which shows a front view of a light tube of a backlight module according to a preferred embodiment of the present invention. The backlight module 100 of the present invention is applicable to common liquid crystal display devices. In this embodiment, the backlight module 100 at least includes a backplane 102 , a light guide plate 116 , a power supply module 120 (see FIG. 1 c ), and lamps 104 and 106 . The backplane 102 has opposite front surfaces 142 and back surfaces 118 , wherein the side walls 144 of the backplane 102 wrap around the periphery of the front surface 142 of the backplane 102 . Generally speaking, the material of the backplane 102 can be metal. The light sources of the backlight module 100 are light tubes 104 and 106 , such as cold cathode tubes (CCFL). The lamp tubes 104 and 106 are disposed on the front surface 142 of the back panel 102 and disposed along the inner sidewall of the side wall 144 to provide side light sources. The light guide plate 116 is located on the front surface 142 of the back plate 102 , and the light tubes 104 and 106 are located around the light guide plate 116 . In this embodiment, two lamp tubes 104 and 106 are used. However, it is worth noting that the backlight module of the present invention can only use one lamp as the light source, depending on the requirements of the display elements.

Please also refer to FIG. 1 c , which shows a schematic diagram of the device at the back of a backlight module according to a preferred embodiment of the present invention. As shown in Figure 1c, the power supply module 120 is generally arranged on the central area of the back 118 of the backplane 102, wherein the power supply module 120 can be, for example, an integrated power supply (LCD Integrated Power Supply; LIPS) of a liquid crystal display, and the power supply The module 120 is generally mainly composed of a power converter (Adaptor) and an inverter (Inverter). The power supply module 120 has connectors 126 and 128 at the high voltage output area, and connectors 130 and 132 at the low voltage output area. Generally speaking, the number of connectors of the power supply module usually depends on the number of lamp tubes used, and one lamp tube is usually connected to two connectors of high voltage and low voltage. The connectors 126 , 128 , 130 , and 132 of the power supply module 120 are generally not disposed at the corners of the power supply module 120 , but are usually disposed on two side sections of the power supply module 120 , such as the middle section. Therefore, the shapes of the lamp tubes 104 and 106 provided in this embodiment are both U-shaped, wherein the outlet ends 108 and 110 of the lamp tube 104 and the outlet ends 112 and 114 of the lamp tube 106 are opposite to each other and both fall on the back plate 102. The side sections, instead of falling on the four corners of the backplane 102, match the positions of the connectors 126, 128, 130, and 132 of the power supply module 120, as shown in FIGS. 1b and 1c. The wire outlets 108 and 110 of the lamp tube 104 and the wire outlets 112 and 114 of the lamp tube 106 are preferably located on the central area of the side of the back plate 102, and more preferably located on the side of the back plate 102 from the corresponding joints 126, 130, 128 and 132 are the closest. Through such shape design of the lamp tubes 104 and 106, the sum of the distances between the outlet terminals 108 and 110 and the outlet terminals 112 and 114 of the lamp tubes 104 and 106 and the corresponding connectors 126, 130, 128 and 132 can be made smaller than that in the back plate 102. The sum of the distances from the terminals adjacent to the outlet terminals 108 , 110 , 112 and 114 to the connectors 126 , 130 , 128 and 132 . Wherein, in accordance with the positions of the outlet ends 108, 110, 112 and 114 of the lamp tubes 104 and 106, the back plate 102 is also provided with corresponding outlet holes 122 and 124 for the wires 134, 136, 138 and 140 extend through the backplane 102 between the front side 142 and the back side 118 of the backplane 102 .

Since the shapes of the two lamp tubes 104 and 106 are both ㄈ-shaped, rather than the traditional L-shaped or linear shape, and the two outlet ends of each lamp tube are located on the side section of the back plate 102 rather than at the corner , so the distance between any outlet end of each lamp tube and the corresponding connector in the power supply module 120 is shorter than the distance between the traditional L-shaped or linear lamp tube and the corresponding connector. In this way, the length between the wire 136 at the outlet end 108 of the lamp tube 104 and the length between the connector 126 and the length between the wire 140 at the outlet end 110 and the connector 130, and the length between the wire 134 at the outlet end 112 of the lamp tube 106 and the connector 128 can be effectively reduced. The length is the same as the length from the wire 138 at the outlet end 114 to the connector 132. Therefore, the parasitic capacitance of the wires 134 , 136 , 138 , and 140 of the lamp tubes 104 and 106 can be further reduced, thereby effectively reducing the leakage current generated by the wires 134 , 136 , 138 , and 140 when the components are in operation.

It is worth noting that in the present invention, according to product requirements, only one ㄈ-shaped light tube can be included, and the two outlet ends of the ㄈ-shaped light tube are preferably located in the center of the opposite sides of the back panel. area.

Please refer to FIG. 2 a , which shows a front view of a lamp tube of a backlight module according to another preferred embodiment of the present invention. Similar to the foregoing embodiments, the backlight module 200 is mainly composed of a backplane 202 , a light guide plate 216 , a power supply module 220 (see FIG. 2 c ), and lamp tubes 204 and 206 . The backplane 202 has opposite front surfaces 242 and back surfaces 218 , wherein the side walls 244 surround the perimeter of the front surface 242 of the backplane 202 . The light source of the backlight module 200 also adopts two light tubes 204 and 206 composed of cold cathode tubes, for example. The light tubes 204 and 206 are disposed on the front surface 242 of the back panel 202 along the inner sidewall of the side wall 244 . The light guide plate 216 is located on the front surface 242 of the back plate 202 , and the light tubes 204 and 206 are located around the light guide plate 216 .

Please refer to Fig. 2 b at the same time, in order to avoid the combination of two lamp tubes may produce dark shadows at the adjacent places, so in this embodiment, the lengths of the lamp tubes 204 and 206 used are increased so that the two lamp tubes 204 and 206 Parts of the lamp tubes 204 and 206 overlap each other to enhance the intensity of the light source at the joint area of the two lamp tubes 204 and 206 . Wherein, the lamp tubes 204 and 206 can be combined in the manner of stacking up and down or stacking up and down.

Please refer to FIG. 2 c , which shows a schematic diagram of the device at the back of a backlight module according to another preferred embodiment of the present invention. Likewise, the power supply module 220 is disposed on the central area of the rear surface 218 of the backplane 202 , and the power supply module 220 has connectors 226 and 228 at the high voltage output area, and connectors 230 and 232 at the low voltage output area. The shapes of the lamp tubes 204 and 206 provided in this embodiment are also in the shape of a “ㄈ”, wherein the outlet ends 208 and 210 of the lamp tube 204 and the outlet ends 212 and 214 of the lamp tube 206 are interlaced with each other and all fall on the back plate 202. The side sections, instead of falling on the four corners of the backplane 202, match the positions of the connectors 226, 228, 230, and 232 of the power supply module 220, as shown in FIG. 2c. The wire outlets 208 and 210 of the lamp tube 204 and the wire outlets 212 and 214 of the lamp tube 206 are preferably located on the central area of the side of the back plate 202, and more preferably located on the side of the back plate 202 from the corresponding joints 228, 232, 226 and 230 are the closest. Coordinating with the positions of the outlet ends 208, 210, 212 and 214 of the lamp tubes 204 and 206, the back plate 202 is also provided with corresponding outlet holes 222 and 224 for the wires 234, 236, 238 and 240 to pass through the back plate 202. And extend to the back side 218 of the backplane 202 .

By designing the shapes of the lamp tubes 204 and 206, the sum of the distances between the outlet terminals 208 and 210 and the outlet terminals 212 and 214 of the lamp tubes 204 and 206 and the corresponding joints 228, 232, 226 and 230 can be smaller than that of the adjacent connectors in the 202 backboard. The sum of the distances from the end points of the outlet terminals 208 , 210 , 212 and 214 to the connectors 226 , 230 , 228 and 232 . In this way, the lengths of the wires 234 , 236 , 238 and 240 can be effectively reduced. Therefore, the leakage current of the wires 234 , 236 , 238 and 240 can be effectively reduced during the operation of the device.

It is worth noting that the present invention can only use a substantially square lamp tube, and the two outlet ends of the substantially square lamp tube are preferably located in the central area of one side of the back panel. Therefore, the shape of the lamp tube of the present invention is not limited to the ㄈ shape, but the shape of the lamp tube can be modified according to the position of the output area of the power supply module, so as to shorten the distance from the outlet end of the lamp tube to the corresponding output area.

The backlight module of the present invention can be used in liquid crystal display devices. Please refer to FIG. 3 , which shows a device system diagram of a liquid crystal display device according to a preferred embodiment of the present invention. The liquid crystal display device 300 is mainly assembled by a liquid crystal panel 302 , a backlight module 304 , and a front frame 316 . The backlight module 304 of the liquid crystal display device 300 adopts the same backlight module as that of the foregoing embodiments, that is, the shape of the lamp tube 302 adopts the same design concept as that of the foregoing embodiments. Wherein, the backlight module 304 mainly includes a backplane 306 , a power supply module 314 disposed on the back of the backplane 306 , a light guide plate 310 disposed on the front of the backplane 306 , and a light tube 312 disposed around the light guide plate 310 . In addition, in order to improve the utilization rate of the light source, a reflective sheet 308 can be added between the light guide plate 310 and the back plate 306 . The display panel 302 is disposed on the backlight module 304 and disposed above the light guide plate 310 . The upper front frame 316 covers the periphery of the liquid crystal panel 302 and can be combined with the back plate 306 to roughly complete the liquid crystal display device 300 .

From the above preferred embodiments of the present invention, one advantage of the present invention is that by designing the shape of the lamp tube, the distance between the outlet end of the lamp tube and the corresponding connector in the power supply module can be shortened. Therefore, the length of the wire connecting the outlet end of the lamp tube and the power supply module can be correspondingly shortened, thereby effectively improving the parasitic capacitance of the lamp wire and further reducing the leakage current of the lamp wire.

It can be seen from the above-mentioned preferred embodiments of the present invention that another advantage of the present invention is that the backlight module has at least one ㄈ-shaped light tube or a substantially square light tube, wherein the outlet end of the ㄈ-shaped light tube falls on the screen. On opposite sides and adjacent to the connectors of the power supply module. Therefore, the leakage current of the wire can be effectively reduced, and the utilization rate of the power supply can be effectively improved, thereby achieving the purpose of improving the stability of the light source.

It can be seen from the above-mentioned preferred embodiments of the present invention that another advantage of the present invention is that the shape of the lamp tube can be designed according to the position of the connector of the power supply of the backlight module, so as to shorten the distance between the outlet end and the connector of the power supply. Relatively shorten the length of the lead wire of the lamp tube. Therefore, the leakage current of the wires of the lamp tube can be improved, thereby improving the efficiency of the light source, and further obtaining a liquid crystal display device with high display quality.

Although the present invention has been disclosed above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make various modifications and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims (14)

1. backlight module comprises at least:

Backboard has the relative front and the back side;

One source supply module is located on this back side of this backboard, and wherein this power supply module comprises high pressure output area and low pressure output area at least;

Light guide plate is located on this front of this backboard; And

At least one fluorescent tube, be located at the periphery of this light guide plate, wherein the position of two of this at least one fluorescent tube leading-out terminals is corresponding respectively and be adjacent to this high pressure output area and this low pressure output area, make thus these leading-out terminals to the distance of this corresponding high pressure output area and this low pressure output interval and less than the end points that is adjacent to these leading-out terminals in this backboard to the distance of this high pressure output area and this low pressure output interval and.

2. backlight module as claimed in claim 1, wherein this at least one fluorescent tube comprises a ㄈ font fluorescent tube.

3. backlight module as claimed in claim 2, wherein two leading-out terminals of this ㄈ font fluorescent tube lay respectively on the middle section of relative dual-side of this backboard.

4. backlight module as claimed in claim 1, wherein this at least one fluorescent tube comprises two ㄈ font fluorescent tubes.

5. backlight module as claimed in claim 4, wherein these ㄈ font fluorescent tubes all have two leading-out terminals, and these leading-out terminals of these ㄈ font fluorescent tubes toward each other.

6. backlight module as claimed in claim 4, wherein these ㄈ font fluorescent tubes all have two leading-out terminals, and these leading-out terminals of these ㄈ font fluorescent tubes are overlapped at least.

7. backlight module as claimed in claim 4, wherein two leading-out terminals of each these ㄈ font fluorescent tube lay respectively on the middle section of relative dual-side of this backboard.

8. liquid crystal indicator comprises at least:

Backlight module comprises at least:

Backboard has the relative front and the back side;

Power supply module is located on this back side of this backboard, and wherein this power supply module comprises high pressure output area and low pressure output area at least;

Light guide plate is located on this front of this backboard; And

At least one fluorescent tube, be located at the periphery of this light guide plate, wherein the position of two of this at least one fluorescent tube leading-out terminals is corresponding respectively and be adjacent to this high pressure output area and this low pressure output area, make thus these leading-out terminals to the distance of this corresponding high pressure output area and this low pressure output interval and less than the end points that is adjacent to these leading-out terminals in this backboard to the distance of this high pressure output area and this low pressure output interval and; And

Display panel is located on this backlight module, and wherein this display panel configurations is on this light guide plate.

9. liquid crystal indicator as claimed in claim 8, wherein this at least one fluorescent tube comprises a ㄈ font fluorescent tube.

10. liquid crystal indicator as claimed in claim 9, wherein two leading-out terminals of this ㄈ font fluorescent tube lay respectively on the middle section of relative dual-side of this backboard.

11. liquid crystal indicator as claimed in claim 8, wherein this at least one fluorescent tube comprises two ㄈ font fluorescent tubes.

12. liquid crystal indicator as claimed in claim 11, wherein these ㄈ font fluorescent tubes all have two leading-out terminals, and these leading-out terminals of these ㄈ font fluorescent tubes toward each other.

13. liquid crystal indicator as claimed in claim 11, wherein these ㄈ font fluorescent tubes all have two leading-out terminals, and these leading-out terminals of these ㄈ font fluorescent tubes are overlapped at least.

14. liquid crystal indicator as claimed in claim 11, wherein two leading-out terminals of each these ㄈ font fluorescent tube lay respectively on the middle section of relative dual-side of this backboard.

Images