CN101944334A - Driving method of LCD - Google Patents
Driving method of LCD Download PDFInfo
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- CN101944334A CN101944334A CN2009100544921A CN200910054492A CN101944334A CN 101944334 A CN101944334 A CN 101944334A CN 2009100544921 A CN2009100544921 A CN 2009100544921A CN 200910054492 A CN200910054492 A CN 200910054492A CN 101944334 A CN101944334 A CN 101944334A
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Abstract
The invention discloses a driving method of LCD, comprising the steps of: dividing the display panel into a plurality of scanning blocks each of which comprises a plurality of display areas; randomly taking one scanning block as the target scanning block, wherein each display area in the target scanning block comprises at least a plurality of backlights; and detecting the gray scale value of one image data in the target display area, and adjusting the brightness of at least one backlight corresponding to the target display area according to the gray scale value of the image data.
Description
Technical field
The invention relates to a kind of driving method of LCD, refer to that especially a kind of is the driving method of LCD of the scanning backlight of light source with the light emitting diode.
Background technology
Because the backlight module of conventional liquid crystal is to adopt whole the backlight that formula is lighted, that is the brightness of backlight is maintained fixed and can be along with the time change to some extent, the phenomenon that dynamic fuzzy (Motionblur) therefore arranged easily is so the LCD of scanning backlight is just derived.Fig. 1 is the synoptic diagram of the LCD of known scanning backlight.As shown in Figure 1, display panels 110 includes three scanning blocks 112,114,116, and each scanning block respectively includes the fluorescent tube 120 as backlight.The type of drive of the LCD of known scanning backlight is as follows: drive the period first, scanning 112 corresponding fluorescent tube 120a of block and 120b light, and all the other fluorescent tubes are all closed; Drive the period second, scanning 114 corresponding fluorescent tube 120c of block and 120d light, and all the other fluorescent tubes are all closed; Drive the period the 3rd, scanning 116 corresponding fluorescent tube 120e of block and 120f light, and all the other fluorescent tubes are all closed; The order that repeats above lamp tube starting again and close afterwards.For each scanning block, its display mode just as inserting a black picture, therefore can reduce the phenomenon of dynamic fuzzy.
According to the type of drive of the LCD of the above scanning backlight, fluorescent tube 120 can't all be opened simultaneously, thus the overall brightness of LCD can to light LCD than whole formula low.With shown in Figure 1, the overall brightness of the LCD that the application scanning formula is backlight is about whole formula and lights 1/3 of LCD, and the consumed power of fluorescent tube also is to be about whole formula to light 1/3 of LCD.
The problem that descends for the LCD overall brightness that solves scanning backlight, the brightness of fluorescent tube 120 can be increased to improve the overall brightness of LCD, yet, need be because increase the brightness of fluorescent tube 120 with lamp works (for example bigger lamp current) under higher electric condition, so the life-span of fluorescent tube will obviously reduce.
Summary of the invention
Therefore the object of the present invention is to provide that a kind of (Light emitted diode is LED) as the driving method of the LCD of backlight, to solve the above problems with light emitting diode.
The embodiment of the invention discloses a kind of driving method of LCD, and it includes: a display panel is divided into a plurality of scanning blocks, and each scanning block includes a plurality of viewing areas; Get arbitrary those scanning blocks as a targeted scans block, wherein each viewing area includes at least one those backlights in this targeted scans block; And in this targeted scans block, detect the GTG value of an image data of a target viewing area, and according to the GTG value of this image data to adjust brightness at least one target backlight that should the target viewing area.
In one embodiment of this invention, above-mentioned these a few backlights are a plurality of light emitting diodes.
In one embodiment of this invention, above-mentioned this display panel is a display panels.
In one embodiment of this invention, the GTG value of this image data in this target viewing area of above-mentioned detecting is the maximum gray value of this image data in this target viewing area of detecting.
In one embodiment of this invention, the step of the brightness of this target backlight of above-mentioned adjustment includes:
The brightness of adjusting this target backlight makes that the maximum gray value of this image data becomes positive correlation in brightness and this target viewing area of this target backlight.
In one embodiment of this invention, the step of the brightness of this target backlight of above-mentioned adjustment includes in addition:
Judge the time that this image data shows in this target viewing area;
Calculate an object brightness of this target backlight according to the GTG value of this image data in this target viewing area; And
Directly adjust this target backlight according to time and this object brightness that this image data in this target viewing area shows.
Description of drawings
Fig. 1 is the synoptic diagram of the LCD of known scanning backlight;
Fig. 2 is the synoptic diagram of the LCD of embodiment of the invention scanning backlight;
Fig. 3 is the synoptic diagram of viewing area brightness of the LCD of the LCD of scanning backlight shown in Figure 1 and scanning backlight of the present invention shown in Figure 2;
Fig. 4 adjusts the process flow diagram of the LCD brightness of scanning backlight for the present invention.
Embodiment
Please refer to Fig. 2, Fig. 2 is the synoptic diagram of the LCD of embodiment of the invention scanning backlight.As shown in Figure 2, display panels 210 includes three scanning blocks 212,214,216, and scanning block 212,214,216 is provided as one group of light emitting diode 220,230,240 of backlight respectively; Wherein scan block 212,214,216 and be divided into a plurality of viewing areas again respectively.In addition, scanning block 212,214,216 viewing area 1 in be respectively arranged with light emitting diode 220a, 230a, 240a is used as backlight; Scanning block 212,214,216 viewing area 2 in be respectively arranged with light emitting diode 220b, 230b, 240b is used as backlight, wherein each light emitting diode all can be adjusted its brightness.
The type of drive of the LCD of the scanning backlight of the embodiment of the invention is described as follows: drive the period first, scanning block 212 pairing light emitting diodes 220 are lighted, light emitting diode 230 and 240 is all closed, in addition, the maximum gray value of image data becomes positive correlation in the brightness of the pairing light emitting diode 220 in viewing area of scanning in the block 212 and this corresponding viewing area.For instance, the maximum gray value of supposing the image data of viewing area 1 in the scanning block 212 is 200, then can adjust the brightness of corresponding light emitting diode 212a, make viewing area 1 in the scanning block 212 can demonstrate the correct GTG of this image data and get final product, as long as that is can be shown to the GTG value be 200 all right.And the maximum gray value is 100 in the image data of the viewing area 2 in the hypothesis scanning block 212, then reduces the brightness of corresponding light emitting diode 212b, makes that viewing area 2 can demonstrate the correct GTG of this image data in the scanning block 212 to get final product.As mentioned above, the maximum gray value of the image data in the viewing area is big more, and then the brightness of corresponding light emitting diode is also big more, that is the brightness of light emitting diode becomes positive correlation with image data GTG value in the video data; Drive the period second, scanning block 214 pairing light emitting diodes 230 are lighted, light emitting diode 220 and 240 is all closed, the brightness of wherein adjusting the pairing light emitting diode 230 in viewing area in the scanning block 214 is adjusted corresponding to the method for the brightness of the light emitting diode 220 of viewing area in the scanning block 212 when first drives the period the same, the brightness of light emitting diode 230a and 230b with scan block 214 in the maximum gray value of image data of viewing area 1 and viewing area 2 become positive correlation; Drive the period the 3rd, scanning block 216 pairing light emitting diodes 240 are lighted, light emitting diode 220 and 230 is all closed, the brightness of wherein adjusting the pairing light emitting diode 240 in viewing area in the scanning block 216 is adjusted corresponding to the method for the brightness of the light emitting diode 220 of viewing area in the scanning block 212 when first drives the period the same, the brightness of light emitting diode 240a and 240b with scan block 216 in the maximum gray value of image data of viewing area 1 and viewing area 2 become positive correlation; Afterwards, repeat above-mentioned first again and drive the step that the period to the three drives the period.In the present embodiment, the above-mentioned first driving period, second drives the period and the 3rd driving period was three continuous periods.
Please note, shown in Figure 2 with light emitting diode as the embodiment of backlight only for illustrating, wherein scan block, viewing area and viewing area the quantity of corresponding light emitting diode all can be change to some extent according to deviser's consideration, and the variation in this design also belongs to category of the present invention.
Please refer to Fig. 3, Fig. 3 is the synoptic diagram of viewing area brightness of LCD of the scanning backlight of the LCD of scanning backlight shown in Figure 1 and the embodiment of the invention shown in Figure 2.As shown in Figure 3, for same scanning block 310, straight line 311 is the brightness of viewing area of the LCD of known scanning backlight shown in Figure 1, and broken line 312 is the brightness in the liquid crystal display displays zone of application embodiment of the invention scanning backlight, the difference of its cathetus 311 and broken line 312, that is hatched example areas shown in Figure 3, be the consumed power that the LCD of the scanning backlight of the LCD of scanning backlight shown in Figure 1 and the embodiment of the invention shown in Figure 2 differs when operation, hence one can see that, and the LCD of using the scanning backlight of the embodiment of the invention can reduce the consumed power of backlight really.
Yet,, therefore need to increase the brightness of backlight to improve the overall brightness of display because scanning backlight causes the LCD overall brightness to descend.If use fluorescent tube to be used as backlight, then need to increase lamp current with the lifting lighting tube brightness, but therefore also shorten the life-span of fluorescent tube; Yet, if adopt light emitting diode to be used as backlight, because be directly proportional with the open-interval product of this light emitting diode with the brightness of this light emitting diode the serviceable life of a light emitting diode.Therefore when light emitting diode is applied in scanning backlight, be example,, therefore 2～3 times of the brightness liftings of light emitting diode can be able to not be shortened the life-span of light emitting diode because the opening time has only 1/3 with light emitting diode shown in Figure 2.
In addition, as shown in Figure 2, because the brightness meeting of the viewing area that light emitting diode 220,230,240 is corresponded to changes to some extent along with the GTG size of the image data of viewing area, therefore can promote the dynamic contrast (Dynamic contrast) of display.
See also Fig. 4, Fig. 4 adjusts the process flow diagram of back light source brightness for the present invention.Its step briefly is summarized as follows:
Step 400: judge the time that this image data shows in each viewing area.
Step 402: the maximum gray value of detecting the image data of each viewing area.
Step 404: the brightness of calculating this corresponding backlight according to the maximum gray value of image data in each viewing area.
Step 406: this corresponding backlight is directly adjusted in the time that shows according to image data in each viewing area and the brightness of this corresponding backlight.
Note that since the technical characterictic of the LCD of scanning backlight of the present invention in last detailed exposure, so in the flow process shown in Figure 4 the details of operation of each step just other does not give unnecessary details in this.
At the driving method of LCD of the present invention, can be briefly be summarized as follows with the driving method of a viewing area, a display panel is divided into a plurality of scanning blocks, each those scanning block includes a plurality of viewing areas; Get arbitrary those scanning blocks in as a targeted scans block, wherein each viewing area includes at least one those backlights in this targeted scans block; And in this targeted scans block, detect the GTG value of an image data of a target viewing area, and according to the GTG value of this image data to adjust brightness at least one target backlight that should the target viewing area.
The above only is preferred embodiment of the present invention, and all equalizations of being done according to the present patent application claim change and modify, and all should belong to covering scope of the present invention.
Claims (6)
1. the driving method of a LCD is characterized in that, includes:
One display panel is divided into a plurality of scanning blocks, and each those scanning block includes a plurality of viewing areas;
Get arbitrary those scanning blocks in as a targeted scans block, wherein each viewing area includes at least one those backlights in this targeted scans block; And
In this targeted scans block, get arbitrary those viewing areas as a target viewing area, and detect the GTG value of an image data of this target viewing area, and according to the GTG value of this image data to adjust brightness at least one target backlight that should the target viewing area.
2. driving method as claimed in claim 1 is characterized in that, these a few backlights are a plurality of light emitting diodes.
3. driving method as claimed in claim 1 is characterized in that, this display panel is a display panels.
4. driving method as claimed in claim 1 is characterized in that, the GTG value of detecting this image data in this target viewing area is the maximum gray value of this image data in this target viewing area of detecting.
5. driving method as claimed in claim 4 is characterized in that, the step of adjusting the brightness of this target backlight includes:
The brightness of adjusting this target backlight makes that the maximum gray value of this image data becomes positive correlation in brightness and this target viewing area of this target backlight.
6. driving method as claimed in claim 1 is characterized in that, the step of adjusting the brightness of this target backlight includes in addition:
Judge the time that this image data shows in this target viewing area;
Calculate an object brightness of this target backlight according to the GTG value of this image data in this target viewing area; And
Directly adjust this target backlight according to time and this object brightness that this image data in this target viewing area shows.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100544921A CN101944334A (en) | 2009-07-07 | 2009-07-07 | Driving method of LCD |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100544921A CN101944334A (en) | 2009-07-07 | 2009-07-07 | Driving method of LCD |
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| CN101944334A true CN101944334A (en) | 2011-01-12 |
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| CN2009100544921A Pending CN101944334A (en) | 2009-07-07 | 2009-07-07 | Driving method of LCD |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107093410A (en) * | 2017-06-20 | 2017-08-25 | 武汉华星光电技术有限公司 | Liquid crystal display brightness control method, device and LCDs |
| CN108899355A (en) * | 2018-05-21 | 2018-11-27 | 友达光电股份有限公司 | Display control method and display system |
| CN109712588A (en) * | 2019-02-25 | 2019-05-03 | 京东方科技集团股份有限公司 | Grayscale method of adjustment and device, display device |
-
2009
- 2009-07-07 CN CN2009100544921A patent/CN101944334A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107093410A (en) * | 2017-06-20 | 2017-08-25 | 武汉华星光电技术有限公司 | Liquid crystal display brightness control method, device and LCDs |
| CN108899355A (en) * | 2018-05-21 | 2018-11-27 | 友达光电股份有限公司 | Display control method and display system |
| CN108899355B (en) * | 2018-05-21 | 2020-10-27 | 友达光电股份有限公司 | Display control method and display system |
| CN109712588A (en) * | 2019-02-25 | 2019-05-03 | 京东方科技集团股份有限公司 | Grayscale method of adjustment and device, display device |
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Application publication date: 20110112 |