CN1797118A - Backlight module, LCD unit, and method for driving backlight module - Google Patents
Backlight module, LCD unit, and method for driving backlight module Download PDFInfo
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- CN1797118A CN1797118A CN 200410103465 CN200410103465A CN1797118A CN 1797118 A CN1797118 A CN 1797118A CN 200410103465 CN200410103465 CN 200410103465 CN 200410103465 A CN200410103465 A CN 200410103465A CN 1797118 A CN1797118 A CN 1797118A
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Abstract
The invention is a backlight module and a LCD and a method for driving the backlight module. And the LCD comprises a LCD panel and the backlight module, where the LCD panel has a scanning frequency and the backlight module is arranged under the LCD panel to provide a plane light source for it; and n the backlight module, tubes are arranged in light boxes and a driving device drives the tubes according to the scanning frequency to synchronize the operating frequencies of the tubes with the scanning frequency. The driving method firstly receives the scanning frequency and then updates the operating frequencies of the tubes according to the scanning frequency and synchronizes them.
Description
Technical field
The invention relates to the driving method of a kind of light source module, display and light source module, and particularly (Liquid Crystal Display is LCD) with the invention of the driving method of backlight module about a kind of backlight module (back light module), LCD.
Background technology
In recent years, display screen on most mobile phone, digital camera, digital camera, notebook computer and the desktop PC is a main flow with display panels (liquid crystal display panel) all, but because display panels itself does not have luminous function, so below display panels, must provide backlight module to provide liquid crystal panel required area source, make liquid crystal panel reach the effect of demonstration, and obtain enough brightness and contrast simultaneously, and then reach the function of demonstration.
Backlight module is divided into two kinds of side-light type and straight-down negatives usually, wherein the backlight module of side-light type has light guide plate (light guide plate), and line source is arranged at the light inlet side of light guide plate, by light guide plate the line source of incident is converted to the required area source of liquid crystal panel.In addition, the backlight module of straight-down negative then need not be provided with light guide plate, light source be arranged at liquid crystal panel under so that directly provide liquid crystal panel required area source.Because the employed quantity of light source of backlight module of straight-down negative is more, therefore when display has high requirements to light-source brightness, adopt direct type backlight module usually.
Fig. 1 is the vertical view of known direct type backlight module.Please refer to Fig. 1, known direct type backlight module 100 is by lamp box 110 and a plurality of cathode fluorescent tube (ColdCathode Fluorescence Lamp, CCFL) 120 formations.Wherein, cathode fluorescent tube 120 is arranged in the lamp box 110 parallel to each other.
From the above, when backlight module 100 was applied to LCD, display panels was arranged on the backlight module 100, shows with the area source that is provided by backlight module 100.But, when the frequency of operation of cathode fluorescent tube 120 not with display panels scan frequency (scan frequency) synchronously when (synchronous), the shown picture of display panels will produce water ripple phenomenon, and then cause user's uncomfortable sensation visually of LCD.
Therefore, technique known is promptly adjusted the frequency of operation of cathode fluorescent tube 120 when making backlight module 100, makes itself and the presetting of display panels scan Frequency Synchronization.But, when display panels have adjustable when scanning frequency, as long as display panels scan frequency shift, water ripple phenomenon will appear in LCD shown picture once again.And, because the frequency of operation of cathode fluorescent tube 120 is fixing, also just can't eliminate water ripple phenomenon by the frequency of operation of adjusting cathode fluorescent tube 120.
Summary of the invention
The purpose of this invention is to provide a kind of backlight module, be suitable for promoting the display quality of LCD.
A further object of the present invention provides a kind of LCD, is suitable for promoting the display quality of LCD.
Another purpose of the present invention provides a kind of driving method of backlight module, is suitable for promoting the display quality of LCD.
The present invention proposes a kind of backlight module, and the area source that provides display panels required is provided.Display panels has the frequency of scanning.This backlight module mainly is made of lamp box, a plurality of fluorescent tube and drive unit.Lamp box has opening.Fluorescent tube is arranged in the lamp box.Drive unit is connected with fluorescent tube.Drive unit drives fluorescent tube according to the scanning frequency of display panels so that the frequency of operation of fluorescent tube and display panels scan Frequency Synchronization.
Preferred embodiment according to the present invention is described, and above-mentioned drive unit comprises selects circuit and output port, and selects circuit to comprise impact damper, capacitor and inductor circuit, oscillator, on-off circuit and transverter.Above-mentioned impact damper receives and output scans frequency.Above-mentioned capacitor and inductor circuit output filtering scans the digital signal that is produced after the frequency.The default frequency that scans of above-mentioned oscillator output, and defaultly scan the frequency of operation that frequency equals fluorescent tube.Above-mentioned on-off circuit scans frequency or the default frequency that scans according to digital signal decision output.Above-mentioned transverter scans frequency or defaultly exports after scanning frequency inverted received.Above-mentioned output port is to scan frequency or the default frequency drives fluorescent tube that scans.
The present invention reintroduces a kind of LCD, and it mainly is made of display panels and backlight module.Display panels has the frequency of scanning.Backlight module is arranged at the display panels below, in order to provide display panels required area source.This backlight module mainly is made of lamp box, a plurality of fluorescent tube and drive unit.Lamp box has opening, and display panels is positioned at the opening part of lamp box.Fluorescent tube is arranged in the lamp box.Drive unit is connected with fluorescent tube.Drive unit drives fluorescent tube according to the scanning frequency of display panels so that the frequency of operation of fluorescent tube and display panels scan Frequency Synchronization.
The present invention proposes a kind of driving method of backlight module in addition, is applicable to LCD.This LCD comprises display panels and backlight module.Backlight module comprises a plurality of fluorescent tubes at least.Display panels has the frequency of scanning.The driving method of this backlight module is the frequency that scans that receives display panels earlier.Afterwards, upgrade the frequency of operation of fluorescent tube according to scanning frequency, and the frequency of operation of synchronization fluorescent tube with scan frequency.
In sum, in the driving method of the present invention's backlight module, LCD and backlight module, upgrade the frequency of operation of the fluorescent tube of backlight module according to the scanning frequency of display panels, and the frequency of operation of synchronization fluorescent tube with scan frequency.Therefore, the driving method of the present invention's backlight module, LCD and backlight module, during the scanning frequency XOR be asynchronous mutually of the frequency of operation that can solve fluorescent tube and display panels, the water ripple phenomenon that produces on the shown picture of LCD further promotes the display quality of LCD.
State with other purpose, feature and advantage and can become apparent on the present invention for allowing, preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Embodiment
Please refer to Fig. 2, this figure is the vertical view according to a kind of backlight module of a preferred embodiment of the present invention.The area source that provides display panels required is provided backlight module 200, and display panels has the frequency of scanning.Backlight module 200 comprises lamp box 210, a plurality of fluorescent tube 220 and drive unit 230.Wherein, fluorescent tube 220 can be a cathode fluorescent tube.
In the present embodiment, lamp box 210 has opening, to hold fluorescent tube 220 and drive unit 230.The quantity of fluorescent tube 220 is decided according to the deviser's of display panels design, in Fig. 2, then only represents with four fluorescent tubes 220, but naturally not as limit.
Drive unit 230 is connected with fluorescent tube 220, and drives fluorescent tube 220 according to the scanning frequency of display panels, makes the Frequency Synchronization that scans of the frequency of operation of fluorescent tube 220 and display panels.Wherein, scanning frequency can be that level scans frequency (horizontal scan frequency), but not as limit.
In the present embodiment, drive unit 230 comprises selection circuit 232 and output port 234.Please refer to Fig. 3 A, this figure is the circuit block diagram according to a kind of backlight module of a preferred embodiment of the present invention.
In Fig. 3 A, when circuit system 240 had output, what circuit system 240 transmitted display panels scanned frequency to selecting circuit 232, selects circuit 232 then to receive and export this and scans frequency to output port 234.Then, 234 of output ports scan frequency drives fluorescent tube 220 with this.
Please select circuit 232 to comprise impact damper 302, capacitor and inductor circuit 304, on-off circuit 306, transverter 312 and oscillator 314 simultaneously with reference to Fig. 3 A and Fig. 3 B.Wherein, impact damper 302 is in order to receive and output system circuit 240 is transmitted scans frequency.
Capacitor and inductor circuit 304 is electrically connected with impact damper 302, and output filtering scans the digital signal that is produced after the frequency.Wherein, capacitor and inductor circuit 304 has makes the function of filtering to scanning frequency, and the ordinary skill of technical field that the present invention belongs to can know easily, and capacitor and inductor circuit 304 can be made up of capacitor C and inductance L.
In the present embodiment, on-off circuit 306 comprises the first switch 308a, second switch 308b Sheffer stroke gate 310.Wherein, the collection utmost point of the first switch 308a receives and scans frequency, the base stage receiving digital signals of the first switch 308a, and the emitter-base bandgap grading of the first switch 308a is connected to transverter 312.The collection utmost point of second switch 308b receives the default frequency that scans, and the base stage of second switch 308b receives the digital signal through not gate 310 anti-phase mistakes, and the emitter-base bandgap grading of second switch 308b is connected to transverter 312.
Therefore, when circuit system 240 has output when scanning frequency, the digital signal that the capacitor and inductor circuit is exported can make the first switch 308a be switched on, and through the digital signal of anti-phase mistake second switch 308b is closed.So transverter 312 received being scan frequency.
Otherwise when circuit system 240 when output does not scan frequency, the digital signal that the capacitor and inductor circuit is exported can make the first switch 308a be closed, and through the digital signal of anti-phase mistake second switch 308b is switched on.So transverter 312 received being are preset and are scanned frequency (also being the frequency of operation of fluorescent tube).Transverter 312 is electrically connected to on-off circuit 306, and scans frequency or defaultly export output port 234 to after scanning frequency inverted received.
Please be simultaneously with reference to Fig. 3 A and Fig. 4, Fig. 4 is the flow chart of steps according to the driving method of a kind of backlight module of a preferred embodiment of the present invention.
In the present embodiment, the display panels that transmitted by drive unit 230 receiving system circuit 240 of the driving method of backlight module 200 scans frequency (s402).Secondly, then judge the existing frequency of operation whether identical (s404) that scans frequency and fluorescent tube 220 by drive unit 230.
When judgement learns that the existing frequency of operation that scans frequency and fluorescent tube 220 is identical, then get back to step s402; Otherwise, when the existing frequency of operation that scans frequency and fluorescent tube 220 is inequality, then exports this and scan frequency with frequency of operation (s406) as fluorescent tube 220.Then, the frequency of operation that makes fluorescent tube 220 with scan Frequency Synchronization (s408).
In the present invention's preferred embodiment, backlight module 200 also comprises diffuser plate (not expressing among the figure), is arranged at the opening part of lamp box 210.And the light that fluorescent tube 220 is sent penetrates to lamp box 210 via diffuser plate.
In the present invention's preferred embodiment, backlight module 200 also comprises blooming piece (not expressing among the figure), and it is arranged on the diffuser plate.And blooming piece can be a prismatic lens.
In sum, in the driving method of the present invention's backlight module, LCD and backlight module, upgrade the frequency of operation of the fluorescent tube of backlight module according to the scanning frequency of display panels, and the frequency of operation of synchronization fluorescent tube with scan frequency.Therefore, the driving method of the present invention's backlight module, LCD and backlight module, during the scanning frequency XOR be asynchronous mutually of the frequency of operation that can solve fluorescent tube and display panels, the water ripple phenomenon that produces on the shown picture of LCD further promotes the display quality of LCD.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; the ordinary skill of any technical field that the present invention belongs to; without departing from the spirit and scope of the invention; when can doing a little change and retouching, so the present invention's protection domain is as the criterion as the scope person of defining that look claims.
Description of drawings
Fig. 1 is the vertical view of known backlight module.
Fig. 2 is the vertical view according to a kind of backlight module of a preferred embodiment of the present invention.
Fig. 3 A is the circuit block diagram according to a kind of backlight module of a preferred embodiment of the present invention.
Fig. 3 B is the circuit block diagram according to a kind of drive unit of a preferred embodiment of the present invention.
Fig. 4 is the flow chart of steps according to the driving method of a kind of backlight module of a preferred embodiment of the present invention.
The main element description of symbols
100,200: backlight module
110,210: lamp box
120,220: fluorescent tube
230: drive unit
232: select circuit
234: output port
240: circuit system
302: impact damper
304: the capacitor and inductor circuit
306: on-off circuit
308a: first switch
308b: second switch
310: not gate
312: transverter
314: oscillator
C: electric capacity
L: inductance
S402～s408: each steps flow chart
Claims (16)
1. the area source that provides display panels required is provided for backlight module, it is characterized in that this backlight module comprises:
Lamp box has opening;
A plurality of fluorescent tubes are arranged in this lamp box; And
Drive unit is connected with above-mentioned these fluorescent tubes, and this drive unit drives above-mentioned these fluorescent tubes according to this scanning frequency of display panels, so that this of the frequency of operation of above-mentioned these fluorescent tubes and this display panels scans Frequency Synchronization.
2. the backlight module according to claim 1 is characterized in that this scans frequency and comprises that level scans frequency.
3. the backlight module according to claim 1 is characterized in that this drive unit comprises:
Select circuit, comprising:
Impact damper scans frequency in order to receive and to export this;
The capacitor and inductor circuit is electrically connected to this impact damper, and this scans the digital signal that is produced after the frequency in order to output filtering;
Oscillator in order to export the default frequency that scans, wherein should default scan the frequency of operation that frequency equals above-mentioned these fluorescent tubes;
On-off circuit is electrically connected to this impact damper, this capacitor and inductor circuit and this oscillator, in order to this scans frequency and should default scan a kind of in the frequency according to this digital signal decision output; And
Transverter is electrically connected to this on-off circuit, exports with a kind of conversion back that should default scan in the frequency in order to received this scanned frequency; And
Output port is electrically connected to this transverter and above-mentioned these fluorescent tubes, in order to scan frequency and above-mentioned these fluorescent tubes of a kind of driving that should default scan in the frequency with this.
4. the backlight module according to claim 1 is characterized in that also comprising diffuser plate, is arranged at this opening part of this lamp box, and the light that above-mentioned these fluorescent tubes sent is suitable for penetrating to this lamp box via this diffuser plate.
5. the backlight module according to claim 4 is characterized in that also comprising blooming piece, is arranged on this diffuser plate.
6. the backlight module according to claim 5 is characterized in that this blooming piece comprises prismatic lens.
7. the backlight module according to claim 1 is characterized in that above-mentioned these fluorescent tubes comprise cathode fluorescent tube.
8. LCD is characterized in that comprising:
Display panels; And
Backlight module is arranged under this display panels, and in order to provide this display panels required area source, this backlight module comprises:
Lamp box has opening, and wherein this display panels is positioned at this opening part of this lamp box;
A plurality of fluorescent tubes are arranged in this lamp box; And
Drive unit is connected with above-mentioned these fluorescent tubes, and this drive unit drives above-mentioned these fluorescent tubes according to this scanning frequency of display panels, so that this of the frequency of operation of above-mentioned these fluorescent tubes and this display panels scans Frequency Synchronization.
9. described according to Claim 8 LCD is characterized in that this scans frequency and comprises that level scans frequency.
10. described according to Claim 8 LCD is characterized in that this drive unit comprises:
Select circuit, comprising:
Impact damper scans frequency in order to receive and to export this;
The capacitor and inductor circuit is electrically connected to this impact damper, and this scans the digital signal that is produced after the frequency in order to output filtering;
Oscillator in order to export the default frequency that scans, wherein should default scan the frequency of operation that frequency equals above-mentioned these fluorescent tubes;
On-off circuit is electrically connected to this impact damper, this capacitor and inductor circuit and this oscillator, in order to this scans frequency and should default scan a kind of in the frequency according to this digital signal decision output; And
Transverter is electrically connected to this on-off circuit, exports with a kind of conversion back that should default scan in the frequency in order to received this scanned frequency; And
Output port is electrically connected to this transverter and above-mentioned these fluorescent tubes, in order to scan frequency and above-mentioned these fluorescent tubes of a kind of driving that should default scan in the frequency with this.
11. described according to Claim 8 LCD, it is characterized in that this backlight module also comprises diffuser plate, be arranged between this lamp box and this display panels, and the light that above-mentioned these fluorescent tubes sent is suitable for penetrating to this display panels via this diffuser plate.
12. the LCD according to claim 11 is characterized in that this backlight module also comprises blooming piece, is arranged on this diffuser plate.
13. the LCD according to claim 12 is characterized in that this blooming piece comprises prismatic lens.
14. described according to Claim 8 LCD is characterized in that above-mentioned these fluorescent tubes comprise cathode fluorescent tube.
15. the driving method of a backlight module is applicable to LCD, this LCD comprises display panels and backlight module, and this backlight module comprises a plurality of fluorescent tubes at least, it is characterized in that the driving method of this backlight module comprises:
Receive the frequency that scans of this display panels; And
Scan the frequency of operation that frequency is upgraded above-mentioned these fluorescent tubes according to this, and the frequency of operation of above-mentioned these fluorescent tubes of synchronization and this scan frequency.
16. according to the driving method of claim 15 a described backlight module, the step that it is characterized in that upgrading the frequency of operation of above-mentioned these fluorescent tubes comprises:
It is whether identical with the existing frequency of operation of above-mentioned these fluorescent tubes to judge that this scans frequency; And
When this scans the existing frequency of operation of frequency and above-mentioned these fluorescent tubes when different, export this and scan frequency with frequency of operation as above-mentioned these fluorescent tubes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004101034656A CN100365490C (en) | 2004-12-30 | 2004-12-30 | Backlight module, LCD unit, and method for driving backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004101034656A CN100365490C (en) | 2004-12-30 | 2004-12-30 | Backlight module, LCD unit, and method for driving backlight module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1797118A true CN1797118A (en) | 2006-07-05 |
| CN100365490C CN100365490C (en) | 2008-01-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004101034656A Expired - Fee Related CN100365490C (en) | 2004-12-30 | 2004-12-30 | Backlight module, LCD unit, and method for driving backlight module |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101859683A (en) * | 2010-04-30 | 2010-10-13 | 郭修 | Novel fluorescent lamp tube adopting sweep frequency illumination mode |
| CN103632629A (en) * | 2013-11-14 | 2014-03-12 | 深圳创维－Rgb电子有限公司 | TV backlight drive control method and TV backlight drive control device |
| US11348543B2 (en) | 2020-03-26 | 2022-05-31 | Macroblock, Inc. | Scan-type display apparatus, and driving device and driving method thereof |
| US11355057B2 (en) | 2020-03-26 | 2022-06-07 | Macroblock, Inc. | Scan-type display apparatus and driving device thereof |
| US11355076B2 (en) | 2020-03-26 | 2022-06-07 | Macroblock, Inc. | Scan-type display apparatus and driving device thereof |
| TWI768706B (en) * | 2020-03-26 | 2022-06-21 | 聚積科技股份有限公司 | Scanning display and its driving device |
| US11380248B2 (en) | 2020-03-26 | 2022-07-05 | Macroblock, Inc. | Driving method and driving device for driving a scan-type display |
| US11404011B2 (en) | 2020-03-26 | 2022-08-02 | Macroblock, Inc. | Scan-type display apparatus, in which refreshing of images on a display thereof can occur when a line scan cycle of a light emitting diode array of the display ends, and driving method thereof |
| US11568793B2 (en) | 2020-03-26 | 2023-01-31 | Macroblock, Inc. | Scan-type display apparatus, and driving device and driving method thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5461397A (en) * | 1992-10-08 | 1995-10-24 | Panocorp Display Systems | Display device with a light shutter front end unit and gas discharge back end unit |
| US6118221A (en) * | 1997-10-16 | 2000-09-12 | Tokin Corporation | Cold-cathode tube lighting circuit with protection circuit for piezoelectric transformer |
| JP2000321549A (en) * | 1999-05-14 | 2000-11-24 | Toyota Motor Corp | Back light type color display device |
| KR100878217B1 (en) * | 2001-08-28 | 2009-01-14 | 삼성전자주식회사 | Liquid crystal display device and method for driving thereof |
| JP4032696B2 (en) * | 2001-10-23 | 2008-01-16 | 日本電気株式会社 | Liquid crystal display |
-
2004
- 2004-12-30 CN CNB2004101034656A patent/CN100365490C/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101859683A (en) * | 2010-04-30 | 2010-10-13 | 郭修 | Novel fluorescent lamp tube adopting sweep frequency illumination mode |
| CN103632629A (en) * | 2013-11-14 | 2014-03-12 | 深圳创维－Rgb电子有限公司 | TV backlight drive control method and TV backlight drive control device |
| CN103632629B (en) * | 2013-11-14 | 2016-04-13 | 深圳创维－Rgb电子有限公司 | TV backlight drive control method and device |
| US11348543B2 (en) | 2020-03-26 | 2022-05-31 | Macroblock, Inc. | Scan-type display apparatus, and driving device and driving method thereof |
| US11355057B2 (en) | 2020-03-26 | 2022-06-07 | Macroblock, Inc. | Scan-type display apparatus and driving device thereof |
| US11355076B2 (en) | 2020-03-26 | 2022-06-07 | Macroblock, Inc. | Scan-type display apparatus and driving device thereof |
| TWI768706B (en) * | 2020-03-26 | 2022-06-21 | 聚積科技股份有限公司 | Scanning display and its driving device |
| US11380248B2 (en) | 2020-03-26 | 2022-07-05 | Macroblock, Inc. | Driving method and driving device for driving a scan-type display |
| US11404011B2 (en) | 2020-03-26 | 2022-08-02 | Macroblock, Inc. | Scan-type display apparatus, in which refreshing of images on a display thereof can occur when a line scan cycle of a light emitting diode array of the display ends, and driving method thereof |
| US11568793B2 (en) | 2020-03-26 | 2023-01-31 | Macroblock, Inc. | Scan-type display apparatus, and driving device and driving method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100365490C (en) | 2008-01-30 |
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Effective date of registration: 20130717 Address after: 350000, No. 1, building 6, building No. third, fourth, Confucian Road West, Mawei District, Fujian, Fuzhou Patentee after: CPT DISPLAY TECHNOLOGY (SHENZHEN)CO., LTD. Address before: Taiwan, Taipei, China Zhongshan North Road 3 paragraph 22 Patentee before: Chunghwa Picture Tubes Ltd. |
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Granted publication date: 20080130 Termination date: 20191230 |