CN2266849Y - Cold cathode fluorescent tube colour large screen display driver - Google Patents
Cold cathode fluorescent tube colour large screen display driver Download PDFInfo
- Publication number
- CN2266849Y CN2266849Y CN 96237183 CN96237183U CN2266849Y CN 2266849 Y CN2266849 Y CN 2266849Y CN 96237183 CN96237183 CN 96237183 CN 96237183 U CN96237183 U CN 96237183U CN 2266849 Y CN2266849 Y CN 2266849Y
- Authority
- CN
- China
- Prior art keywords
- fluorescent tube
- cold cathode
- cathode fluorescent
- screen display
- ccfl
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000003990 capacitor Substances 0.000 claims description 2
- 230000005611 electricity Effects 0.000 abstract 1
- 238000005265 energy consumption Methods 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The utility model relates to a driver of an electric discharge tube. A start-stop oscillator is composed of a transistor and a high-frequency transformer, and the start-stop oscillator generates high-frequency voltage of 50KC or so. The high-frequency voltage is boosted by 1000-1200V by a low power high-frequency transformer for supplying electricity for a CCFL. The intensity of an electrical level which is inputted in a base electrode of the transistor by a control circuit controls the brightness and the extinguishment of the CCFL. Under the condition that the high-frequency voltage is determinate, the brightness of each CCFL is determined by the turn-on time of the base electrode of the transistor, which can control the color and the grey level of each pixel in an image. A better image display effect can be obtained, and cost is lowered.
Description
The utility model relates to the driver of the colored large-size screen monitors video display of a kind of driver of discharge tube, particularly cold cathode fluorescent tube (CCFL).
Large screen display system mainly is made up of playback equipment, display device, control circuit and five parts of drive circuit.For the large screen system that dissimilar display devices constitute, except that the drive circuit difference, other parts are basic identical.Existing outdoor large color screen video display devices mainly contains LED pipe, bulb and Flat-Panel CRT etc.But from brightness, color, life-span, power consumption and price is that the ratio of performance to price is also unsatisfactory.The large color screen made from cold cathode fluorescent tube show and have the brightness height (＞20,000Cd/M
2), colored good (similar), life-span long (＞20,000 hour), (＜3 watts /) low in energy consumption and the low advantage of price comparison with CRT.Yet,, also do not reach the stage of practical application at present because its operating characteristic requires complexity to drive circuit.
The purpose of this utility model provides a kind of cold cathode fluorescent tube large color screen display driver of practical use, makes outdoor large screen display brightness height, and colour is good, low in energy consumption, cost is few.
In order to achieve the above object, the utility model adopts a plurality of unit drives to be formed in parallel, and each element circuit drives a CCFL; Each unit drive adopts intermittent oscillation circuit, specifically is connected to: current-limiting resistance of base stage serial connection of oscillistor, and emitter connects a resistance and lands; Collector electrode meets power supply Vc by the primary coil of high frequency transformer; The secondary coil centre tap ground connection of high frequency transformer, an end of secondary coil meets CCFL by current limiting capacitance, and the other end is connect the base stage of oscillistor by feedback capacity.The circuit of each unit drive is identical.Under the certain situation of high frequency voltage, the brightness of every CCFL is by transistor base service time decision.The operating state of each unit drive (vibrate, extinguish) is fully by transistorized base stage level " 1 " or " O " decision, when the base stage level is " 1 " (2～5 V), and transistorized current amplification factor β＞1, loop starting of oscillation; On the contrary; When the base stage level is " O " (less than 0.7V), β＜1, vibration is extinguished.Therefore the operating state of CCFL is controlled by the control circuit output level of large screen display system fully, realizes the compatibility with the other types display control circuit.
Adopt this driver circuit structure simple, cost is extremely low, its control circuit and general TTL and MOS integrated circuit compatibility, can effectively realize control to each pixel color in the image and ash level, display brightness height, low in energy consumption, colored good becomes a reality the making that realizes high-performance, low price outdoor full color look CCFL large-screen video image and image-text displaying system.
Fig. 1 is the colored curtain display driving circuit of a cold cathode fluorescent tube schematic diagram.
Among Fig. 1, the base stage of transistor 4 is gone into to hold and is connected in series current-limiting resistance 2 between the A1 with axle, and the A1 place connects diode 1 negative pole, and positive pole lands; Emitter connects negative feedback resistor 5 and lands; Collector electrode one tunnel meets power supply Vc through the primary coil and the choking-winding 6 of high frequency transformer 7; The secondary coil centre tap of high frequency transformer lands, and an end of secondary coil meets CCFL8 through current limiting capacitance 9, and another termination capacitor 3 feeds back to the base stage input A1 place of transistor 4.More than constitute the first module circuit.Second element circuit to the N element circuit is identical with the connection of first module circuit, and just the element numbers difference is joined.
During practical application, Vc can adopt DC power supply or the Switching Power Supply of 12V: electric capacity 3 can be selected 0.01Pf porcelain Jie container for use; Electric capacity 9 can be selected 18Pf for use; Resistance 2 can be selected 1K Ω resistance for use; Resistance 5 can be selected 100 Ω for use; Choking-winding 8 can be selected 3 milihenry inductance for use.
Claims (1)
1, a kind of cold cathode fluorescent tube large color screen display driver, it is characterized in that driver is in parallel and form by the identical unit drive of a plurality of circuit, each unit drive adopts the oscillating circuit of having a rest, it specifically is connected to: current-limiting resistance of base stage serial connection of oscillistor, emitter connects negative feedback resistor and lands, collector electrode meets power supply Vc by the primary coil of high frequency transformer, the secondary coil centre tap of high frequency transformer lands, one end of secondary coil connects cold cathode fluorescent tube through current limiting capacitance, the base stage of another termination capacitor oscillistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96237183 CN2266849Y (en) | 1996-07-08 | 1996-07-08 | Cold cathode fluorescent tube colour large screen display driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96237183 CN2266849Y (en) | 1996-07-08 | 1996-07-08 | Cold cathode fluorescent tube colour large screen display driver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2266849Y true CN2266849Y (en) | 1997-11-05 |
Family
ID=33912833
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96237183 Expired - Fee Related CN2266849Y (en) | 1996-07-08 | 1996-07-08 | Cold cathode fluorescent tube colour large screen display driver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2266849Y (en) |
-
1996
- 1996-07-08 CN CN 96237183 patent/CN2266849Y/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 | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 1997.11.05 |