CN201133991Y - LCD device backlight module possessing multiple phase fall lamp tube group - Google Patents

Abstract

The utility model relates to a backlight module of a liquid crystal display device, which is provided with a lamp group of multiple phase difference. The backlight module comprises at least two groups of fluorescent lamps; each group of lamps comprises at least one fluorescent lamp; the two groups of fluorescent lamps are arranged with the alternative phase spacing and are lighted within 180 degrees, which is half of the lighting period of the drive circuit of the backlight module lamp. The lighting process requires no information on the displayed images, or no complex calculation. The simple lighting circuit can be used for eliminating the dark field in the backlight provided by the backlight source. Therefore, the backlight module has the advantages of simple structure, low costs, no deviation of the quality of the image (in particular the quality of colors) on the liquid crystal display device from the original quality to result in the obvious distortion, and so on.

Description

The backlight module with multiple phase drop light tube group of liquid crystal indicator

Technical field

The utility model relates to the backlight module of liquid crystal indicator (liquid crystal display devices), relates in particular to the backlight module that can reduce the LCD display device of image blurringization when showing the rapid moving object image.

Background technology

Comprise the LCD device such as computing machine, TV screen, when showing the rapid moving object image, the obfuscation of object on display screen is that problem to be solved is arranged always.The existing trial utilized the reaction time that increases the transistor switch in the LCD panel pixel element (pixel element) in the known technology, and attempts to solve such problem.For example, the reaction time of present typical LCD panel pixels switching transistor has had 5ms even high relatively faster reaction velocity.

Also the someone attempts addressing this problem among the backlight module that light source is provided for panel in addition.This has comprised static and dynamic glittering program (blinking schemes), and it is to attempt to make backlight module that the backlight intensity that is complementary with shown image is provided, to scheme to reduce the obfuscation problem of rapid moving object image.It is frequency spectrum sequence LCD (spectrum sequential LCD) that a kind of practice is also arranged in addition, and its ultimate principle mainly is to utilize the fluorescent tube of two groups of different models alternately to illuminate panel.

But the practice of known technology all needs to obtain the information content of display image, and it need carry out complex calculations (algorithms) can control its glittering and/or frequency spectrum sequence backlight module.In addition, because this practice that adaptability light source (adaptive lighting) is provided, the picture quality of this LCD display device (for example, also its chromaticity particularly) just can deviate from outside the original quality, particularly because backlight illumination and light variation on the color that control caused of time causes the obvious distortion of shown image.

Summary of the invention

Therefore, purpose of the utility model is to provide a kind of backlight module that can reduce the LCD display device of image blurringization when showing the rapid moving object image.

Another purpose of the utility model is to provide a kind of backlight module that can reduce the LCD display device of image blurringization when showing the rapid moving object image, it can be independent of outside the view data content of shown image and independent operation, to avoid using complicated control operation program.

Another purpose of the utility model is to provide a kind of backlight module that can reduce the LCD display device of image blurringization when showing the rapid moving object image, and it can reflect the essence of the true nature of shown image.

For achieving the above object, the utility model provides a kind of backlight module with multiple phase drop light tube group of liquid crystal indicator, it includes the fluorescent tube of at least two groups, each is organized fluorescent tube and comprises at least one fluorescent tube, and the fluorescent tube of described at least two groups is with staggering phase intervals and light in regular turn in during half 180 degree of cycle of lighting a lamp of this backlight module lamp tube driving circuit.

The utility model also provides a kind of backlight module with multiple phase drop light tube group of liquid crystal indicator, it includes the fluorescent tube of at least two groups, each is organized fluorescent tube and comprises at least one fluorescent tube, and the fluorescent tube of this at least two group is to light in regular turn at interval with the equal phase difference in during half 180 degree of cycle of lighting a lamp of this backlight module lamp tube driving circuit.

The utility model also provides a kind of backlight module with multiple phase drop light tube group of liquid crystal indicator, it comprises a drive circuit of fluorescent tube, described drive circuit of fluorescent tube includes at least two transverters, and quantity is corresponding at least two group fluorescent tubes of described at least two transverters, each is organized fluorescent tube and comprises at least one fluorescent tube, described at least two transverters with half 180 degree of cycle of lighting a lamp of this drive circuit of fluorescent tube during in the equal phase difference drive this group fluorescent tube of lighting its correspondence at interval and in regular turn.

The utility model yet provides a kind of liquid crystal indicator, comprise drive circuit of fluorescent tube, described drive circuit of fluorescent tube includes at least two transverters, and quantity is corresponding at least two group fluorescent tubes of described at least two transverters, each is organized fluorescent tube and comprises at least one fluorescent tube, described at least two transverters with half 180 degree of cycle of lighting a lamp of this drive circuit of fluorescent tube during in the equal phase difference drive this group fluorescent tube of lighting its correspondence at interval and in regular turn.

The beneficial effects of the utility model are: as long as LCD is activated use, its back light does not just have during the illuminating of zero luminance or mistake low-light level; The use of hardware resource can be performed at utmost; It is minimum to have cost, advantages such as space minimum; Circuit structure is simple, and is with low cost, the picture quality (particularly its chromaticity) of LCD display device is deviated from outside the original quality and causes the obvious distortion of shown image.

Description of drawings

Fig. 1 is the circuit block diagram of preferred embodiment that the utlity model has the liquid crystal indicator of multiple phase drop light tube group backlight module.

Fig. 2 is that the lamp group that the utlity model has the liquid crystal indicator embodiment of two rephase drop light tube group backlight modules is lighted the driving time precedence diagram.

Fig. 3 has the single design sketch of lighting of two rephase drop light tube group for Fig. 2.

Fig. 4 lights design sketch for the integral body that Fig. 2 has two rephase drop group fluorescent tubes.

Wherein, description of reference numerals is as follows:

100 backlight modules 100

110 drive circuit of fluorescent tube

111,112,118 transverters

141,142,148,151,152,158 fluorescent tubes

Embodiment

Fig. 1 is the circuit block diagram that the utlity model has liquid crystal indicator one preferred embodiment of multiple phase drop light tube group backlight module.Utilize among the figure block scheme in a schematic way the driving circuit of the fluorescent tube group of display backlight module 100 and the transverter (lamp inverter) that driving is lighted thereof connect situation.According to the utility model, the backlight module 100 of LCD device has the fluorescent tube of many groups, though be cold-cathode fluorescence lamp (cold cathode fluorescent lamp, CCFL) or hot-cathode fluorescent lamp (hot cathodefluorescent lamp, HCFL) fluorescent tube of pattern.These fluorescent tubes are divided into many groups, are driven respectively according to the program of the equiphase drop of being separated by between each group by driving circuit 110 and light.

Be driven and light and fluorescent tube in working the electric current that its tube current comes down to change according to sine wave curve.According to the variation of the order of magnitude of its lamp current, the lamplight brightness that fluorescent tube sent also changes thereupon, by dark to bright again to secretly and repeatedly variation.Because general its change frequency is high, human eye is because of the former of persistence of vision effect thereby can't distinguish the variation of this high frequency light and shade.For simplicity, below the point the during lamp tube starting of indication among the comment paragraph of the present utility model, be as the reference point when being zero with the tube current.

According to the utility model, the fluorescent tube 141 among Fig. 1 and 151 is driven by transverter 111 and is lighted, and fluorescent tube 142 and 152 is driven by transverter 112, and fluorescent tube 148 and 158 are lighted by transverter 118.According to the practice of preferred embodiment of the present utility model, between the transverter 111,112---and 118 etc., be to drive in regular turn with the equal phase difference spacing in the 180 degree scopes to light.For example, be 6 as the N among Fig. 1, the phase differential (180/6=30) of 30 degree of then can being separated by between the transverter 111 and 112.Program after the degree of 30 after then transverter 118 the is lighted phase place, is got back to transverter 111 again according to this.

For example, Fig. 2 is according to the liquid crystal indicator embodiment that the utlity model has two rephase drop light tube group backlight modules, and the time sequencing figure of driving is lighted in its fluorescent tube grouping.As previously mentioned, these two groups of fluorescent tubes are to light driving respectively according to the phase differential of 90 degree (180/2=90), and promptly as shown in FIG., phase differential is spent at interval in 90 between time point 212 and 222 of lighting of two light tube group.

The single design sketch of lighting that Fig. 3 has two rephase drop light tube group for Fig. 2, its two groups fluorescent tubes that separate with 90 degree phase places, its longitudinal axis is lamp luminescence brightness, with curve 310 and 320 expressions, light and shade changes along with transverse axis time progress respectively in the drawings.By the zero luminance of minimum point, to high-high brightness I _Max, between two extreme values, change.

But, utilize two groups of fluorescent tubes of lighting phase shifting, dark situation occurs Quan promptly can get rid of backlight module fully, no matter how of short duration its time is according to the utility model as shown in Figure 4.Fig. 4 displayed map 2 has the sum total of two rephase drop light tube group and lights design sketch.According to a kind of like this program of lighting a lamp of the present utility model, its sum total brightness is two brightness curves 310 and 320 addition result, i.e. sum total brightness curve 400 among Fig. 4 among Fig. 3.This sums up brightness 400, as shown in the figure, is at I _MaxAnd I _MinChange repeatedly between two extreme values.According to the utility model, be example with two groups of minimum fluorescent tube packet group number, its minimum brightness is also greater than more than 50 percent of high-high brightness (1/ (sin45 °+cos45 °)=0.707).

In other words, if all the light source fluorescent tubes in the backlight module are divided at least two groups, each group is lighted with poor (equal phase lagging in one-half cycle) between the semiperiod that equates in fact in regular turn, then just can be the LCD panel backlight that continues to illuminate is provided.Promptly, as long as LCD is activated use, its back light does not promptly have during the illuminating of zero luminance or mistake low-light level yet.

Among the backlight module according to the utility model preferred embodiment, all fluorescent tubes all are the states that is in full-time 100% operation during start-up operation whole, are the states that is in the idle commentaries on classics of timesharing without any fluorescent tube just therefore.This can use the fluorescent tube resource in the backlight module maximum degree, therefore fluorescent tube quantity can be reduced to minimumly under same brightness demand, just the use of hardware resource can be performed at utmost.Therefore, it is minimum to the utlity model has cost, advantages such as space minimum.

Among the backlight module of the present utility model, the group number that fluorescent tube is distinguished is many more, and the light source of whole backlight module is just average more, therefore can represent the primitive nature character of its shown image best.By contrast, the Strength Changes backlight illumination of the active accommodation backlight of known technology then can make image original speciality generation distortion.In addition, according to the operation of backlight module of the present utility model fully not needs obtain view data.The operation of the utility model backlight module is totally independent of outside the LCD panel.This can reduce cost, and reduces the probability of fault.

Because the program of lighting a lamp of the present utility model does not need to obtain the information content of display image, more do not need to carry out complex calculations, provided " details in a play not acted out on stage, but told through dialogues " among backlight and just merely eliminate backlight with the simplest lamp circuit, therefore not only circuit structure is simple, with low cost, the picture quality (particularly its chromaticity) of LCD display device is deviated from outside the original quality and cause the obvious distortion of shown image.

Above-described only is preferable possible embodiments of the present utility model; described embodiment is not in order to limit scope of patent protection of the present utility model; therefore the equivalent structure done of every utilization instructions of the present utility model and accompanying drawing content changes, and in like manner all should be included in scope of patent protection of the present utility model.

Claims (11)

1. the backlight module with multiple phase drop light tube group of a liquid crystal indicator is characterized in that:

It comprises:

At least two group fluorescent tubes, each is organized fluorescent tube and comprises at least one fluorescent tube, and described at least two group fluorescent tubes are with staggering phase intervals and light in regular turn in during half 180 degree of cycle of lighting a lamp of this backlight module lamp tube driving circuit.

2. the backlight module with multiple phase drop light tube group of liquid crystal indicator as claimed in claim 1 is characterized in that: the equal phase difference interval in during half 180 degree of the cycle of lighting a lamp that the described phase intervals that staggers is this backlight module lamp tube driving circuit.

3. the backlight module with multiple phase drop light tube group of liquid crystal indicator as claimed in claim 1, it is characterized in that: described fluorescent tube is a cathode fluorescent tube.

4. the backlight module with multiple phase drop light tube group of liquid crystal indicator as claimed in claim 1, it is characterized in that: described fluorescent tube is a thermal cathode fluorescent tube.

5. the backlight module with multiple phase drop light tube group of a liquid crystal indicator is characterized in that:

It comprises:

At least two group fluorescent tubes, each is organized fluorescent tube and comprises at least one fluorescent tube, and described at least two group fluorescent tubes are to light in regular turn at interval with the equal phase difference in during half 180 degree of cycle of lighting a lamp of this backlight module lamp tube driving circuit.

6. the backlight module with multiple phase drop light tube group of liquid crystal indicator as claimed in claim 5, it is characterized in that: described fluorescent tube is a cathode fluorescent tube.

7. the backlight module with multiple phase drop light tube group of liquid crystal indicator as claimed in claim 5, it is characterized in that: described fluorescent tube is a thermal cathode fluorescent tube.

8. the backlight module with multiple phase drop light tube group of a liquid crystal indicator is characterized in that:

It comprises:

One drive circuit of fluorescent tube includes at least two transverters, and

Quantity is corresponding at least two group fluorescent tubes of described at least two transverters, each is organized fluorescent tube and comprises at least one fluorescent tube, and described at least two transverters are to drive this group fluorescent tube of lighting its correspondence at interval and in regular turn with the equal phase difference in during half 180 degree of cycle of lighting a lamp of this drive circuit of fluorescent tube.

9. liquid crystal indicator is characterized in that:

It comprises:

One drive circuit of fluorescent tube includes at least two transverters, and

Quantity is corresponding at least two group fluorescent tubes of described at least two transverters, each is organized fluorescent tube and comprises at least one fluorescent tube, and described at least two transverters are to drive this group fluorescent tube of lighting its correspondence at interval and in regular turn with the equal phase difference in during half 180 degree of cycle of lighting a lamp of this drive circuit of fluorescent tube.

10. liquid crystal indicator as claimed in claim 9 is characterized in that: described fluorescent tube is a cathode fluorescent tube.

11. liquid crystal indicator as claimed in claim 9 is characterized in that: described fluorescent tube is a thermal cathode fluorescent tube.

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