CN101661709A - Liquid crystal display, LED backlight module driving device and method thereof - Google Patents
Liquid crystal display, LED backlight module driving device and method thereof Download PDFInfo
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- CN101661709A CN101661709A CN200810214432A CN200810214432A CN101661709A CN 101661709 A CN101661709 A CN 101661709A CN 200810214432 A CN200810214432 A CN 200810214432A CN 200810214432 A CN200810214432 A CN 200810214432A CN 101661709 A CN101661709 A CN 101661709A
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Abstract
The invention discloses a liquid crystal display, an LED backlight module driving device and a method thereof. The provided LED backlight module driving device comprises a control unit and a driving unit, wherein the control unit is used for alternately providing first control signals and second control signals according to switching signals; the driving unit is coupled with the control unit and is used for driving at least one LED with a first color in an LED backlight module according to the first control signals or the second control signals so that the LED with the first color can displaythe first color with at least two different wavelengths.
Description
Technical field
The present invention relates to a kind of plane display technique, and relate in particular to a kind of LCD and LED backlight module driving device and method.
Background technology
Along with photoelectricity and development of semiconductor, driven the flourish of flat-panel screens, and in many flat-panel screens, LCD has become the main flow in market immediately because of having advantageous characteristic such as high spatial utilization ratio, low consumpting power, radiationless and low electromagnetic interference (EMI).LCD generally comprises display panels and backlight module, and because display panels itself does not have self luminous characteristic, therefore backlight module must be configured in the display panels below, the light source that provides display panels required is provided, and so LCD could be watched to the user by show image.
In recent years, because the demand of the color change that the user can present for LCD and the quality of image is more and more higher, so many tame dealers make great efforts pondering for this demand invariably.Generally speaking, in order to promote the color change that LCD can present and the demand of the quality of image, the most direct idea is exactly the colour gamut (color gamut) that must promote LCD, and it is existing in order to promote the colour gamut of LCD, many tame dealers except meeting from colored optical filtering substrates is set about, and also can utilize light-emitting diode (LED) backlight module (LED backlight module) to replace the existing backlight module of habitually practising that emits white light, so can promote the colour gamut of LCD effectively with higher color purity.
It is by (CommissionInternational De ' l E ' the clairage of international lighting association that those skilled in the art should know well so-called colour gamut, CIE) formulated in 1931, as shown in Figure 1, and the gamut range that this association made be the regional A among Fig. 1.Basically, the colour gamut coordinate of any color all can be with (x, y) coordinate is represented, and the leg-of-mutton area B that is surrounded by three Essential colour (that is red, green and blue) on the colour gamut coordinate is exactly the scope of the LCD change color that can present, and this scope is also being represented the colour gamut of LCD.Therefore, as long as area B that this triangle constituted is strengthened, then represent the colour gamut of LCD will be wide more, so the LCD color change and the quality of image that can present will promote.
And in order to strengthen the scope of the area B that described triangle constitutes, many tame dealers have been developed the notion that a kind of polygon colour gamut, merge earlier with reference to Fig. 1 and Fig. 2 in this, the most direct interpretive mode of notion to this polygon colour gamut will have now by three Essential colour (that is red exactly, green and blue) the leg-of-mutton area B that surrounded changes (that is red by four Essential colour, indigo plant and different wave length two are green) surround a tetragonal area B ', so mode not only can cause the colour gamut of LCD to become wide, and can also promote the color change and the quality of image that LCD can present effectively.
Moreover, to desire to fall all during when the existing notion that develops the polygon colour gamut that in LCD, it must set up the green LED of the wavelength of one group of green LED that adopts different from the past more in traditional light-emitting diode (LED) backlight module.That is to say, improvement light-emitting diode (LED) backlight module later can have red light emitting diodes, blue LED, and the green LED of two kinds of different wave lengths (for example: wavelength is that green LED and the wavelength of 520nm is the green LED of 530nm).So with two green LEDs of different wave length, cooperate red, blue dichromatism light emitting diode to carry out colour mixture after, can make human eye experience tetragonal gamut range.
Yet, according to the above-mentioned content that discloses as can be known, in order to allow the colour gamut of LCD reach the purpose of polygon colour gamut, must set up the green LED of the wavelength of one group of green LED that adopts different from the past more in traditional light-emitting diode (LED) backlight module, so will cause the design cost of light-emitting diode (LED) backlight module integral body to increase.
Summary of the invention
In view of this, purpose of the present invention just provides a kind of LED backlight module driving device and method, its light emitting diode that does not need additionally to add other Essential colour is in light-emitting diode (LED) backlight module, and only need adopt general now light-emitting diode (LED) backlight module just can allow the colour gamut of LCD reach the purpose of polygon colour gamut.
Another object of the present invention just provides a kind of LCD, its mainly be by utilization LED backlight module driving device that the invention described above provided and method in wherein, be used to promote its color change that can present and quality of image.
Based on above-mentioned and the purpose desiring to reach, the invention provides a kind of LED backlight module driving device, it comprises control module and driver element.Wherein, control module can be according to switching signal, and first control signal and second control signal alternately are provided.Driver element can be coupled to control module, and it can be according to described first control signal or described second control signal, come the light emitting diode of at least one first color in the driven for emitting lights diode backlight module, be used to cause the light emitting diode of described first color can present first color of at least two kinds of different wave lengths.
In one embodiment of the invention, driver element also can come the light emitting diode of at least one second color in the driven for emitting lights diode backlight module according to described first control signal or described second control signal, is used to cause the light emitting diode of described second color can present second color of at least two kinds of different wave lengths.
In one embodiment of the invention, driver element also can come the light emitting diode of at least one the 3rd color in the driven for emitting lights diode backlight module according to described first control signal or described second control signal, is used to cause the light emitting diode of described the 3rd color can present the 3rd color of at least two kinds of different wave lengths.
From another viewpoint, the invention provides a kind of light-emitting diode (LED) backlight module driving method, it comprises the following steps: at first, and first control signal and second control signal alternately are provided according to switching signal.Then, come the light emitting diode of at least one first color in the driven for emitting lights diode backlight module according to described first control signal or described second control signal, be used to cause the light emitting diode of described first color can present first color of at least two kinds of different wave lengths.
In one embodiment of the invention, light-emitting diode (LED) backlight module driving method provided by the present invention also comprises the light emitting diode that comes at least one second color in the driven for emitting lights diode backlight module according to described first control signal or described second control signal, is used to cause the light emitting diode of described second color can present second color of at least two kinds of different wave lengths; And come the light emitting diode of at least one the 3rd color in the driven for emitting lights diode backlight module according to described first control signal or described second control signal, be used to cause the light emitting diode of described the 3rd color can present the 3rd color of at least two kinds of different wave lengths.
In an embodiment of the invention described above, described switching signal is that the time schedule controller by LCD is provided.
From another viewpoint, the invention provides a kind of LCD again, it comprises display panels, light-emitting diode (LED) backlight module, and LED backlight module driving device.Wherein, display panels is used for the show image picture.Light-emitting diode (LED) backlight module is disposed at the below of display panels, and has the light emitting diode of at least one first color, one second color and one the 3rd color, and the area source that provides display panels required is provided.
LED backlight module driving device couples light-emitting diode (LED) backlight module, be used to receive switching signal, and drive the light emitting diode of described first color, described second color and described the 3rd color respectively according to first control signal or second control signal, be used to cause the light emitting diode of described first color, described second color and described the 3rd color can present first color, second color and the 3rd color of at least two kinds of different wave lengths respectively.
In one embodiment of the invention, LCD provided by the present invention also comprises time schedule controller, and it couples LED backlight module driving device, is used to provide described switching signal.
In one embodiment of the invention, LED backlight module driving device comprises control module and driver element.Wherein, control module couples time schedule controller, and being used for alternately provides described first control signal and described second control signal according to described switching signal.Driver element can couple control module and light-emitting diode (LED) backlight module, and the light emitting diode that it can drive described first color, described second color and described the 3rd color according to described first control signal or described second control signal respectively is used to cause the light emitting diode of described first color, described second color and described the 3rd color can present first color, second color and the 3rd color of at least two kinds of different wave lengths respectively.
In one embodiment of the invention, be built in the time schedule controller in the LED backlight module driving device meeting.
In an embodiment of the invention described above, described first color is that green, described second color are blueness, and described the 3rd color is red.
In an embodiment of the invention described above, described first control signal is the pulse width modulating signal with a plurality of different duty, and described second control signal is the pulse width modulating signal of a full dutycycle.
LED backlight module driving device provided by the present invention and method are suitable for driving general now light-emitting diode (LED) backlight module, it mainly is because green, the chip material of blue dichromatism light emitting diode is element semiconductor material (its material behavior is for being subjected to can to produce blue shift after the piezoelectric effect), and the chip material of red light emitting diodes is quaternary element semiconductor material (its material behavior is can produce red shift after being heated), so it is hot, green, when blue Tricolor LED is subjected to the pulse width modulating signal driving of different duty during different two pictures, the three can produce the red of two different wavelength respectively during described two different pictures, green, blue, thus again by after the colour mixture, the gamut range that can cause human eye to be experienced is changeable shape and color territory, that is the above colour gamut of quadrilateral at least.
Also because of like this, LED backlight module driving device provided by the present invention and method do not need additionally to add the light emitting diode of other Essential colour in general now light-emitting diode (LED) backlight module, and only need adopt general now light-emitting diode (LED) backlight module just can allow the colour gamut of LCD reach the purpose of polygon colour gamut, can promote the color change and the quality of image that LCD can present thus.
For above and other objects of the present invention, feature and advantage can be become apparent, the preferred embodiments of the present invention cited below particularly, and in conjunction with the accompanying drawings, be described in detail below.
Description of drawings
Fig. 1 illustrates the colour gamut synoptic diagram of being made in 1931 for international lighting association (CIE);
Fig. 2 illustrates and is four quadrilateral colour gamut synoptic diagram that Essential colour constituted of existing employing;
Fig. 3 illustrates the system chart into the LCD of one embodiment of the invention;
Fig. 4 illustrates the block diagram into the LED backlight module driving device of one embodiment of the invention;
Fig. 5 illustrates the gamut map into the LCD of one embodiment of the invention;
Fig. 6 illustrates first control signal that the LED backlight module driving device for one embodiment of the invention provided and the waveform sequential chart of second control signal during two different pictures of LCD;
Fig. 7 illustrates the process flow diagram into the light-emitting diode (LED) backlight module driving method of one embodiment of the invention.
Embodiment
The present invention desires to reach the major technique effect for strengthening the colour gamut of LCD, is used to promote the color change and the quality of image that LCD can present, and reduces manufacturing cost.And following content will be done one at the technical characterictic of this case and the effect desiring to reach and encyclopaedize, and consider and examine to offer those skilled in the relevant art of the present invention.
Fig. 3 illustrates the system chart into the LCD 300 of one embodiment of the invention.With reference to Fig. 3, LCD 300 comprises display panels (LCD panel) 301, light-emitting diode (LED) backlight module (LED backlight module) 303, LED backlight module driving device 305, time schedule controller (timing controller) 307, gate drivers 309, and source electrode driver 311.Wherein, gate drivers 309 is controlled by time schedule controller 307, is used to open one by one each the row pixel (not illustrating) in the display panels 301.
In present embodiment, light-emitting diode (LED) backlight module 303 is disposed at the below of display panels 301, and have the light emitting diode G of first color (that is green), the light emitting diode B of second color (that is blue), and the light emitting diode R of the 3rd color (that is red).As mentioned above, light-emitting diode (LED) backlight module 303 mainly is the light source that is used to provide display panels 301 required, and this light-emitting diode (LED) backlight module 303 is identical with the structure of general now light-emitting diode (LED) backlight module, so at this and no longer given unnecessary details.
In addition, this implementation column also can be after source electrode driver 311 whenever provides data voltage each row pixel to display panels 301 of a correspondence, and light-emitting diode (LED) backlight module 303 promptly provides required light source.Perhaps, when source electrode driver 311 provided data voltage to the pixel in the display panels 301, light-emitting diode (LED) backlight module 303 can provide display panels 301 required light source simultaneously, can cause display panels 301 show image pictures equally.
Fig. 4 illustrates the block diagram into the LED backlight module driving device 305 of one embodiment of the invention.Merging is with reference to Fig. 3 and Fig. 4, and the LED backlight module driving device 305 of present embodiment can be coupled to light-emitting diode (LED) backlight module 303 and time schedule controller 307, and comprises control module 401 and driver element 403.Wherein, control module 401 couples time schedule controller 307, is used to receive the switching signal SS that provided by time schedule controller 307 (for example initial pulse STV, but be not restricted to this), and the first control signal CS1 and the second control signal CS2 alternately are provided.
In present embodiment, suppose control module 401 during N picture of LCD 300 when the first control signal CS1 is provided, then control module 401 can transfer to during (N+1) individual picture of LCD 300 provides the second control signal CS2, but is not limited thereto.That is to say that control module 401 also can provide the second control signal CS2 during N picture of LCD 300, and during (N+1) individual picture of LCD, transfer to the first control signal CS1 is provided.Wherein, N is a positive integer.
In addition, the first control signal CS1 that control module 401 provided is for having pulse width modulating signal (the pulse width modulation signal of a plurality of different duty (duty cycle), and the second control signal CS2 that control module 401 is provided is the pulse width modulating signal of full dutycycle (full dutycycle) PWMsignal).
Continuation is with reference to Fig. 3 and Fig. 4, driver element 403 can couple control module 401 and light-emitting diode (LED) backlight module 303, and the first control signal CS1 or the second control signal CS2 that its meeting is provided according to control module 401, drive green, blue, red trichromatism light emitting diode G, B, R respectively, be used to cause green, blue, red trichromatism light emitting diode G, B, R can present the green, blue, red of at least two kinds of different wave lengths respectively.
So far, when the pulse width modulating signal that why green, blue, red trichromatism light emitting diode G, B, R are subjected to different duty drives, the three can produce the green, blue, red of two different wavelength respectively during two different pictures of LCD 300, below will enumerate concrete reason and experimental data and give those skilled in the relevant art's reference of the present invention.
What at first explain is, chip (chip) material of green, blue dichromatism light emitting diode G, B is generally the element semiconductor material, for example be indium gallium nitrogen (InGaN), the characteristic of this type of element semiconductor material can produce the blue shift phenomenon for being subjected to after the piezoelectric effect, that is its issued light has the phenomenon of inclined to one side indigo plant.In addition, the chip material of red light emitting diodes R is generally the plain semiconductor material of quaternary, for example is aluminium indium gallium phosphorus (AlInGaP), and the characteristic of the plain semiconductor material of this type of quaternary is for producing the red shift phenomenon after being heated.
So difference according to green, blue, red trichromatism light emitting diode G, B, the chip material of R own, present embodiment can be green, blue with driving, the average current of red trichromatism light emitting diode G, B, R is set at 20mA and 30mA (but being not limited to this setting), and be subjected to full dutycycle (that is 100% dutycycle), 80% dutycycle, 60% dutycycle, 40% dutycycle respectively at green, blue, red trichromatism light emitting diode G, B, R, and the experimental data of being done under the condition of the pulse width modulating signal of 20% dutycycle driving is as shown in table 1.
Table 1
From table 1, should find out easily, when the average current that drives green LED G is 20mA, and green LED G is subjected under the condition that the pulse width modulating signal of full dutycycle (i.e. 100% dutycycle) drives, and the wavelength that this moment, green LED G was presented is 523.71nm.In addition, when the average current that drives green LED G still is 20mA equally, but green LED G is subjected under the condition that the pulse width modulating signal of 20% dutycycle drives, and the wavelength that this moment, green LED G was presented clearly can become 517.63nm.
Similarly, when the average current that drives blue LED B is 20mA, and blue LED B is subjected under the condition that the pulse width modulating signal of full dutycycle drives, and the wavelength that this moment, blue LED B was presented is 458.07nm.In addition, when the average current that drives blue LED B still is 20mA equally, but blue LED B is subjected under the condition that the pulse width modulating signal of 20% dutycycle drives, and the wavelength that this moment, blue LED B was presented clearly can become 453.98nm.
Similarly, when the average current that drives red light emitting diodes R is 20mA, and red light emitting diodes R is subjected under the condition that the pulse width modulating signal of full dutycycle drives, and the wavelength that this moment, red light emitting diodes R was presented is 632.09nm.In addition, when the average current that drives red light emitting diodes R still is 20mA equally, but red light emitting diodes R is subjected under the condition that the pulse width modulating signal of 20% dutycycle drives, and the wavelength that this moment, red light emitting diodes R was presented clearly can become 632.77nm.
In addition, the collocation of all the other drive conditions of green, blue, red trichromatism light emitting diode G, B, R all can know from table 1 and find out, thus those skilled in the art should class release by the exemplifying paragraph of above-mentioned present embodiment, so also no longer given unnecessary details at this.
Be easier to be subjected to the influence of piezoelectric effect and produce blue shift via above-mentioned green, blue dichromatism light emitting diode G, the B of having explained, red light emitting diodes R then is easier to the influence of being heated and produces red shift.Therefore, the experimental data that table 1 write down by present embodiment should be found out easily, green, blue dichromatism light emitting diode G, B are under the driving of the pulse width modulating signal of different duty, and the two different wavelength that produced during its two different pictures respectively at LCD 300 can be obviously in red light emitting diodes R.
Also also because of like this, green when the light-emitting diode (LED) backlight module 303 of present embodiment, blue, red trichromatism light emitting diode G, B, when R is subjected to the pulse width modulating signal driving of different duty, the three can produce the green of two different wavelength respectively during two different pictures of LCD 300, blue, red, thus again by after the colour mixture, the gamut range that can cause human eye to be experienced is changeable shape and color territory, and with present embodiment, under preferable situation, the colour gamut of LCD 300 can reach pentagonal colour gamut at least, and it illustrates as the pentagonal area B among Fig. 5 " shown in.
It will be further appreciated that in this, green in order to make, blue, red trichromatism light emitting diode G, B, after R is subjected to the pulse width modulating signal driving of different duty, the brightness that is presented during its two different pictures respectively at LCD 300 needs under the consistent condition, the LED backlight module driving device 305 of present embodiment can be according to green, blue, red trichromatism light emitting diode G, B, R is subjected to the average current after the pulse width modulating signal of full dutycycle drives, adjust a plurality of non-full dutycycles (80% dutycycle for example, 60% dutycycle, 40% dutycycle, the drive current of pulse width modulating signal and 20% dutycycle), be used to reach green, blue, red trichromatism light emitting diode G, B, after R was subjected to the pulse width modulating signal driving of different duty, the brightness that is presented during its two different pictures respectively at LCD 300 also can be consistent.
Fig. 6 illustrates the first control signal CS1 that the LED backlight module driving device 305 for one embodiment of the invention provided and the waveform sequential chart of the second control signal CS2 during two different pictures of LCD 300.With reference to Fig. 6, when green, blue, red trichromatism light emitting diode G, B, R is 20mA in being subjected to the average current after the second control signal CS2 (that is pulse width modulating signal of full dutycycle) drives during N the picture of LCD 300, and it is green, blue, red trichromatism light emitting diode G, B, when R is driven by the first control signal CS1 (that is pulse width modulating signal of 20% dutycycle) must during (N+1) individual picture of LCD 300, this moment, 305 of LED backlight module driving devices can be with green, blue, red trichromatism light emitting diode G, B, R is subjected to the drive current of the pulse width modulating signal of 20% dutycycle to be adjusted into 100mA during (N+1) individual picture of LCD 300, be used to make green, blue, red trichromatism light emitting diode G, B, the average current of R after being subjected to full duty during the N of LCD 300 and (N+1) individual picture respectively when the pulse width modulating signal of 20% dutycycle drives still still is 20mA, so it is green, blue, red trichromatism light emitting diode G, B, after R was subjected to the pulse width modulating signal driving of different duty, the brightness that is presented during its two different pictures respectively at LCD 300 also can be consistent.
Moreover, though according to after the explanation of the foregoing description as can be known, LED backlight module driving device 305 is to be independent of in the middle of the system of LCD 300, according to spirit of the present invention, is not restricted to this.That is to say that the LED backlight module driving device 305 of the foregoing description is built in the time schedule controller 307, can reach the technology effect that the foregoing description is desired to reach equally thus in another embodiment of the present invention then is.About this point, those skilled in the art should be according to the instruction of the foregoing description, and class is released and will be built in the embodiment of time schedule controller 307 in the LED backlight module driving device 305, so also no longer given unnecessary details at this.
In addition, because light-emitting diode (LED) backlight module often disposes white light-emitting diode in it now, but because the chip material of white light-emitting diode still has the phosphor (phosphor) of element semiconductor material and few part, so but the LED backlight module driving device 305 proposed by the invention light-emitting diode (LED) backlight module of drive arrangements adularescent light emitting diode still is used to allow its applied LCD reach the purpose of polygon colour gamut.
Based on the content that the foregoing description disclosed, below will gather a kind of light-emitting diode (LED) backlight module driving method and give those skilled in the relevant art's reference of the present invention.
Fig. 7 illustrates the process flow diagram into the light-emitting diode (LED) backlight module driving method of one embodiment of the invention.With reference to Fig. 7, the light-emitting diode (LED) backlight module driving method of present embodiment comprises the following steps: at first, as described in step S701, alternately provides first control signal and second control signal according to switching signal.In present embodiment, described switching signal is that the time schedule controller by LCD is provided.
Then, as described in step S703, come the light emitting diode of at least one first color (for example green) in the driven for emitting lights diode backlight module according to described first control signal or described second control signal, be used to cause the light emitting diode of described first color (that is green) can present first color (that is green) of at least two kinds of different wave lengths.In present embodiment, described first control signal is the pulse width modulating signal with a plurality of different duty, and the pulse width modulating signal that described second control signal is full dutycycle.
In addition, the light-emitting diode (LED) backlight module driving method that present embodiment provided is not confined to the green LED in the driven for emitting lights diode backlight module only.Clearer, light-emitting diode (LED) backlight module driving method provided by the present invention can also come the light emitting diode of at least one second color (for example blue) in the driven for emitting lights diode backlight module according to described first control signal or described second control signal, is used to cause the light emitting diode of described second color (that is blue) can present second color of at least two kinds of different wave lengths.Similarly, light-emitting diode (LED) backlight module driving method provided by the present invention can also come the light emitting diode of at least one the 3rd color (for example red) in the driven for emitting lights diode backlight module according to described first control signal or described second control signal, is used to cause the light emitting diode of described the 3rd color (that is red) can present the 3rd color (that is red) of at least two kinds of different wave lengths.
In sum, LED backlight module driving device provided by the present invention and method are suitable for driving general now light-emitting diode (LED) backlight module, it mainly is because green, the chip material of blue dichromatism light emitting diode is element semiconductor material (its material behavior is for being subjected to can to produce blue shift after the piezoelectric effect), and the chip material of red light emitting diodes is quaternary element semiconductor material (its material behavior is can produce red shift after being heated), so it is hot, green, when blue Tricolor LED is subjected to the pulse width modulating signal driving of different duty during different two pictures, the three can produce the red of two different wavelength respectively during described two different pictures, green, blue, thus again by after the colour mixture, the gamut range that can cause human eye to be experienced is changeable shape and color territory, that is the above colour gamut of quadrilateral at least.
Also also because of like this, LED backlight module driving device provided by the present invention and method do not need additionally to add the light emitting diode of other Essential colour in general now light-emitting diode (LED) backlight module, and only need adopt general now light-emitting diode (LED) backlight module just can allow the colour gamut of LCD reach the purpose of polygon colour gamut, can promote the color change and the quality of image that LCD can present thus.
Though the present invention discloses as above with preferred embodiment; so it is not to be used to limit the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking the accompanying Claim person of defining.
Claims (12)
1, a kind of LED backlight module driving device comprises:
Control module alternately provides first control signal and second control signal according to switching signal; And
Driver element, couple described control module, according to described first control signal and described second control signal one of them to drive the light emitting diode of at least one first color in the described light-emitting diode (LED) backlight module, be used to cause the light emitting diode of described first color can present described first color of at least two kinds of different wave lengths.
2, LED backlight module driving device as claimed in claim 1, wherein said driver element also drives the light emitting diode of at least one second color in the described light-emitting diode (LED) backlight module according to described first control signal or described second control signal, be used to cause the light emitting diode of described second color can present described second color of at least two kinds of different wave lengths.
3, LED backlight module driving device as claimed in claim 2, wherein said driver element also drives the light emitting diode of at least one the 3rd color in the described light-emitting diode (LED) backlight module according to described first control signal or described second control signal, be used to cause the light emitting diode of described the 3rd color can present described the 3rd color of at least two kinds of different wave lengths.
4, LED backlight module driving device as claimed in claim 3, wherein said first color are that green, described second color are blueness, and described the 3rd color is red.
5, LED backlight module driving device as claimed in claim 1, wherein said first control signal is the pulse width modulating signal with a plurality of different duty, and the pulse width modulating signal that described second control signal is full dutycycle.
6, LED backlight module driving device as claimed in claim 1, wherein said switching signal is provided by the time schedule controller of LCD.
7, a kind of light-emitting diode (LED) backlight module driving method comprises the following steps:
First control signal and second control signal alternately are provided according to switching signal; And
One of them drives the light emitting diode of at least one first color in the described light-emitting diode (LED) backlight module according to described first control signal and described second control signal, is used to cause the light emitting diode of described first color can present described first color of at least two kinds of different wave lengths.
8, light-emitting diode (LED) backlight module driving method as claimed in claim 7 also comprises the following steps:
Drive the light emitting diode of at least one second color in the described light-emitting diode (LED) backlight module according to described first control signal or described second control signal, be used to cause the light emitting diode of described second color can present described second color of at least two kinds of different wave lengths; And
Drive the light emitting diode of at least one the 3rd color in the described light-emitting diode (LED) backlight module according to described first control signal or described second control signal, be used to cause the light emitting diode of described the 3rd color can present described the 3rd color of at least two kinds of different wave lengths.
9, as claim 8 a described light-emitting diode (LED) backlight module driving method, wherein said first color is that green, described second color are blueness, and described the 3rd color is red.
10, as claim 7 a described light-emitting diode (LED) backlight module driving method, wherein said first control signal is the pulse width modulating signal with a plurality of different duty, and the pulse width modulating signal that described second control signal is full dutycycle.
11, as claim 7 a described light-emitting diode (LED) backlight module driving method, wherein said switching signal is provided by the time schedule controller of LCD.
12, a kind of LCD comprises:
Display panels is used for the show image picture;
Light-emitting diode (LED) backlight module is disposed at the below of described display panels, and has the light emitting diode of at least one first color, one second color and one the 3rd color, and the area source that provides described display panels required is provided; And
LED backlight module driving device, couple described light-emitting diode (LED) backlight module, be used to receive switching signal, and drive the light emitting diode of described first color, described second color and described the 3rd color respectively according to first control signal or second control signal, be used to cause the light emitting diode of described first color, described second color and described the 3rd color can present described first color of at least two kinds of different wave lengths, described second color and described the 3rd color respectively.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012006803A1 (en) * | 2010-07-12 | 2012-01-19 | 深圳市华星光电技术有限公司 | Backlight module and lcd |
| CN104867447A (en) * | 2015-04-21 | 2015-08-26 | 友达光电股份有限公司 | Pixel structure and driving method thereof |
-
2008
- 2008-08-26 CN CN200810214432A patent/CN101661709A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012006803A1 (en) * | 2010-07-12 | 2012-01-19 | 深圳市华星光电技术有限公司 | Backlight module and lcd |
| US8912729B2 (en) | 2010-07-12 | 2014-12-16 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Backlight module and an LCD thereof |
| CN104867447A (en) * | 2015-04-21 | 2015-08-26 | 友达光电股份有限公司 | Pixel structure and driving method thereof |
| US10056030B2 (en) | 2015-04-21 | 2018-08-21 | Au Optronics Corporation | Pixel circuit structure and method for driving the same |
| TWI647680B (en) * | 2015-04-21 | 2019-01-11 | 友達光電股份有限公司 | Pixel structure and method for driving the same |
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