CN2606905Y - Back light plate lamp tube connection structure of improved liquid crystal display screen - Google Patents
Back light plate lamp tube connection structure of improved liquid crystal display screen Download PDFInfo
- Publication number
- CN2606905Y CN2606905Y CN 03240432 CN03240432U CN2606905Y CN 2606905 Y CN2606905 Y CN 2606905Y CN 03240432 CN03240432 CN 03240432 CN 03240432 U CN03240432 U CN 03240432U CN 2606905 Y CN2606905 Y CN 2606905Y
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- Prior art keywords
- cold cathode
- transformer
- fluorescent tube
- fluorescent lamp
- lcd screen
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- 239000004973 liquid crystal related substance Substances 0.000 title abstract 2
- 230000008878 coupling Effects 0.000 claims description 18
- 238000010168 coupling process Methods 0.000 claims description 18
- 238000005859 coupling reaction Methods 0.000 claims description 18
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 5
- 230000002950 deficient Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Abstract
A back light plate lamp tube connection structure of improved liquid crystal display screen has high pressure ends and feedback ends of at least one set or more than one set of cold cathode fluorescence lamp tubes in alternating arrangement, feedback ends on both sides of the cold cathode fluorescence lamp tubes are respectively connected with two return plates, the two return plates are connected with a pulse width modulation (PWM) control unit, currents are fed back to the pulse width modulation control unit through the two return plates, and the high pressure ends of the cold cathode fluorescence lamp tubes are respectively connected with a transformer.
Description
Technical field
The utility model relates to a kind of modified LCD screen backlight plate fluorescent tube and connects structure, refers to a kind of many groups cold cathode fluorescent lamp pipe connection structure that adopts alternating expression to arrange at the high-pressure side and the back coupling end of each fluorescent tube especially.
Background technology
Known, be used for the LCD display of LCD TV or additional touch controlled thin film, need more high brightness compensation visual demand.Just can increase many group cold cathode fluorescent lamp in order to reach this demand, cause to drive that the control module number of lighting also increases, the circuit board volume becomes big and each circuit board is connected conductor configurations and is difficult for each, cause manufacture difficulty greatly, the cost increase.
Fig. 1 is connected configuration schematic diagram for existing many fluorescent tubes internal circuit board with fluorescent tube.As shown in the figure: the high-pressure side 22 of these many group fluorescent tubes 21 is connected with the connector 231 of transformer 23 by a connector 221 respectively, and organize transformer 23 more and be integrated in a circuit board 1 formation one inverter 20, should then interconnect by back coupling ends 24 that organize fluorescent tubes 21 more, and be connected to width modulation (PWM) control module 25, make this pulse width modulation controlled unit 25 detect the tube current of these fluorescent tubes 21 by electric current back coupling 26, to export a resonant frequency, the average current of may command CCFL fluorescent tube 12.
Yet the connected mode of above-mentioned multiple cold-cathode fluorescent tube has following defective:
(1) at first, the back coupling end of existing many fluorescent tubes is mutual series connection, often causes distribution work complexity, not only causes the circuit board volume to become big, causes making going up being difficult for, and cost increases, and has more increased the loss on voltage transmits.
(2) secondly, because the high-pressure side of cold cathode fluorescent lamp all is disposed at the same side, so when driving is shinny, often causes this side temperature too high, and then influence its serviceable life.
(3) in addition, when using many tubes to supply brightness and uniformity coefficient, because of the error in every tubes production, often cause tube current and brightness irregularities between fluorescent tube, the puzzlement that becomes in the fluorescent tube apolegamy maybe need improve brightness and uniformity coefficient with more fluorescent tubes, cause cost to increase, and also be difficult for making and adjusting.
The utility model content
So, fundamental purpose of the present utility model is to solve above-mentioned defective, avoid the existence of defective, the utility model high-pressure side and back coupling end of a group or more cold cathode fluorescent lamp pipe at least adopts alternating expression to arrange, to save the stability of wire rod, average tube electric current and increase circuit.
For realizing above-mentioned purpose, modified LCD screen backlight plate fluorescent tube of the present utility model connects structure, the high-pressure side and the back coupling end that are a group or more cold cathode fluorescent lamp pipe at least are the alternating expression arrangement, the back coupling end that makes these cold cathode fluorescent lamp pipe both sides more respectively and be attached to two return plates, this two return plate is connected to a width modulation (PWM) control module, borrow this two return plate with feedback current to this pulse width modulation controlled unit, and the high-pressure side of this cold cathode fluorescent lamp pipe, then be connected with transformer respectively, by driving this transformer action, should light action by many group cold cathode fluorescent lamp pipes to drive, relend back coupling end by each cold cathode fluorescent lamp pipe with feedback current through this two return plate to pulse width modulation controlled unit, this pulse width modulation controlled unit detects the tube current of fluorescent tube by the electric current back coupling, to export a resonant frequency, organize the average currents of cold cathode fluorescent lamp pipes to control this by this transformer more.
Description of drawings
Fig. 1 is connected configuration schematic diagram for existing many fluorescent tubes internal circuit board with fluorescent tube.
Fig. 2 is that fluorescent tube of the present utility model is connected configuration schematic diagram with return plate and pulse width modulation controlled element circuit plate.
Fig. 3 is that inverter of the present utility model is connected configuration schematic diagram with the circuit board of power panel and power supply unit.
Embodiment
Relevant detailed description of the present utility model and technology contents, existing conjunction with figs. is described as follows.
Referring to Fig. 2,3, for fluorescent tube of the present utility model is connected configuration with the circuit board of return plate and pulse width modulation controlled unit, and inverter is connected configuration schematic diagram with power panel.As shown in the figure: modified LCD screen backlight plate fluorescent tube of the present utility model connects structure, the high-pressure side 32 and the back coupling end 33 that are a group or more cold cathode fluorescent lamp pipe 31 at least are the alternating expression arrangement, make the back coupling end 33 of these cold cathode fluorescent lamp pipe 31 both sides be connected to together and be connected to two return plates 34,35 again, this two return plate 34,35 is connected to a width modulation (PWM) control module 36, borrow this two return plate 34,35 with feedback current to this pulse width modulation controlled unit 36.
The high-pressure side 32 of above-mentioned cold cathode fluorescent lamp pipe 31 is borrowed a connector 37 respectively and is connected to the connector 38 of transformer 45 output terminals.
The back coupling end 33 of this cold cathode fluorescent lamp pipe 31 interconnects and is connected to two return plates 34,35.
This transformer 45 can include at least more than one transformer or piezoelectric ceramics transformer, be connected to the connector 37 of this cold cathode fluorescent lamp pipe 31 by a connector 38, and each transformer 45 is integrated on the circuit board 43 forms inverter 46, relend connector 44 on this circuit board 43 and be connected to connector 40 on the power panel 41, this power panel 41 is connected to a power supply unit 42, can directly supply power to each transformer 45 on the inverter 46 through power panel 41 by this power supply unit 42, thereby save wire rod and simplified structure.
This cold cathode fluorescent lamp pipe 31, can two tubes or four tubes be one group, be preferred embodiment of the present utility model.
By driving transformer 45 actions, should light action by many group cold cathode fluorescent lamp pipes 31 to drive, relend back coupling end 33 by each cold cathode fluorescent lamp pipe 31 with feedback current through this two return plates, 34,35 to one pulse width modulation controlled unit 36, this pulse width modulation controlled unit 36 detects the tube current of fluorescent tube 31 by the electric current back coupling, exporting a resonant frequency, thus by this transformer 45 to control the average currents of this many group cold cathode fluorescent lamp pipes 31.
In sum, the utility model has overcome the defective of prior art, has following advantage:
(1) the utility model adopts alternating expression to arrange the cold cathode fluorescent lamp pipe, makes each lamp The high-pressure side of pipe also is staggered, and when driving is shinny, does not cause monolateral excess Temperature.
(2) the utility model is connected in parallel the back coupling end employing of many fluorescent tubes, and unified the company Be connected to two return plates, not only save wire rod, reduce the voltage transmission loss, increase its circuit Stability, and make make easily, cost.
(3) the utility model adopts alternating expression to arrange by high-pressure side and back coupling end with many fluorescent tubes, can make the tube current of each cold cathode fluorescent lamp pipe more average, and then reach impartial shinny purpose.
Claims (5)
1. a modified LCD screen backlight plate fluorescent tube connection structure is characterized in that the high-pressure side (32) of a group or more cold cathode fluorescent lamp pipe (31) and back coupling end (33) are the alternating expression arrangement at least.
2. modified LCD screen backlight plate fluorescent tube according to claim 1 connects structure, it is characterized in that the back coupling end (33) of these cold cathode fluorescent lamp pipe (31) both sides is connected to together and is connected to two return plates (34,35).
3. modified LCD screen backlight plate fluorescent tube according to claim 2 connects structure, it is characterized in that this two return plate (34,35) is connected to a pulse width modulation controlled unit (36).
4. modified LCD screen backlight plate fluorescent tube according to claim 1 connects structure, it is characterized in that, the high-pressure side (32) of these many group cold cathode fluorescent lamp pipes (31) is connected to the output terminal of transformer (45) respectively.
5. modified LCD screen backlight plate fluorescent tube according to claim 4 connects structure, it is characterized in that, this transformer (45) can be located at a circuit board (43) jointly and go up formation inverter (46), this circuit board (43) is connected to a power panel (41), this power panel (41) is connected to a power supply unit (42), can directly power to each transformer (45) on the inverter (46) through power panel (41) by this power supply unit (42).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03240432 CN2606905Y (en) | 2003-03-11 | 2003-03-11 | Back light plate lamp tube connection structure of improved liquid crystal display screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03240432 CN2606905Y (en) | 2003-03-11 | 2003-03-11 | Back light plate lamp tube connection structure of improved liquid crystal display screen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2606905Y true CN2606905Y (en) | 2004-03-17 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03240432 Expired - Fee Related CN2606905Y (en) | 2003-03-11 | 2003-03-11 | Back light plate lamp tube connection structure of improved liquid crystal display screen |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2606905Y (en) |
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2003
- 2003-03-11 CN CN 03240432 patent/CN2606905Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20040317 Termination date: 20120311 |