CN101364382B - Liquid crystal display, back light module driving circuit and method - Google Patents
Liquid crystal display, back light module driving circuit and method Download PDFInfo
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- CN101364382B CN101364382B CN 200710141956 CN200710141956A CN101364382B CN 101364382 B CN101364382 B CN 101364382B CN 200710141956 CN200710141956 CN 200710141956 CN 200710141956 A CN200710141956 A CN 200710141956A CN 101364382 B CN101364382 B CN 101364382B
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Abstract
The invention discloses a driving circuit and a driving method for a liquid crystal display and a backlight module thereof. The driving circuit for the backlight module is suitable for adjusting multiple light emitting sources in the backlight module, and comprises an operation module and a control module. The operation module is used for carrying out AND operation for inputted control signals with various chrominance signals respectively, and inputting the operational results into the control module to adjust the brightness and the chrominance of the light emitting sources. Therefore, instead of using a pulse width modulator to change the power ratios of the light emitting sources, the adjustment of multiple light emitting sources in the backlight module can be realized by only changing the control signals.
Description
Technical field
The invention relates to a kind of driving circuit, and particularly relevant for driving circuit and the driving method of a kind of liquid crystal display and its backlight module.
Background technology
Liquid crystal display (Liquid Crystal Display is called for short LCD) at the initial stage in the 1970's, at first is applied on robot calculator and electronic watch.Subsequently, because having multiple new photoelectric effect to be found and the improvement of Driving technique, make it have advantages of that high image quality, low consumption electric power, slim volume production, low voltage drive, volume are little etc., be widely used at present medium and small Portable TV, picture telephone, shot with video-corder projector, notebook computer, desktop display and projection color tv etc., have and replace gradually negative electrode display tube (or title kinescope, Cathode Ray Tube, CRT) trend.
Liquid crystal display mainly comprises display panels, backlight module and frame.Wherein, the light source that backlight module produces is to determine the colourity of liquid crystal display and a very important factor of brightness.In existing technology, adjust the colourity of backlight module and the mode of brightness, be to change the power ratio (Duty Ratio) of each illuminating source by a pulse width modulation device (Pulse Width Modulation, PWM).
For instance, when colourity 6500 degree and brightness are 100%, the power of each illuminating source, be for example that red light source is 60.94%, green light source is 85.94%, blue-light source is 66.41%, when wish is adjusted to identical colourity brightness and is 10%, need by the pulse width modulation device, each illuminating source power to be changed into be for example that red light source is 6.094%, green light source is 8.594%, blue-light source is 6.641%.
Yet, often limited because of the power ratio resolution of illuminating source if changed the power ratio of illuminating source by the pulse width modulation device when identical colourity is adjusted brightness, and can't control accurately required colourity and brightness.And in the time of need adjusting the pulse width modulation device if any two above technology, increase the degree of difficulty of design pulse width modulation device.
Summary of the invention
Purpose of the present invention is exactly the driving circuit that is to provide a kind of backlight module, is used for adjusting a plurality of light emitting sources of backlight module.
Purpose of the present invention is exactly the driving method that is to provide a kind of backlight module, is suitable for driving a plurality of light emitting sources in described backlight module.
In addition, a further object of the present invention is to provide a kind of driving circuit of backlight module, be suitable for driving a plurality of light emitting sources in backlight module, and this backlight module is suitable for being configured in two-d display panel.
A further object of the present invention is to provide a kind of driving method of backlight module, be suitable for driving a plurality of light emitting sources in backlight module, and this backlight module is suitable for being configured on two-d display panel.
The present invention proposes a kind of driving circuit of backlight module, this backlight module has several light emitting sources, and driving circuit comprises: one group of computing module, reception control signal and the first carrier chrominance signal, and after this computing module carries out the AND computing with control signal and the first carrier chrominance signal, produce the first operation result; And one group of control module, couple the computing module, drive the part at least of light emitting source in order to the foundation operation result.
According to the driving circuit of backlight module of the present invention, above-mentioned control signal is brightness control signal.
Driving circuit according to backlight module of the present invention, above-mentioned computing module also receives the second carrier chrominance signal and the 3rd carrier chrominance signal, and this second carrier chrominance signal and the 3rd carrier chrominance signal are carried out the AND computing with control signal respectively, and corresponding generation the second operation result and the 3rd operation result are given the control module, make this control module and drive these light emitting sources according to the first operation result, the second operation result and the 3rd operation result.
According to the driving circuit of backlight module of the present invention, wherein the first carrier chrominance signal, the second carrier chrominance signal and the 3rd carrier chrominance signal are respectively a red GTG signal, green GTG signal and blue GTG signal.
According to the driving circuit of backlight module of the present invention, wherein the computing module comprises: first with the door, in order to reception control signal and the first carrier chrominance signal, and export the first operation result to controlling module.Second with the door, in order to reception control signal and the second carrier chrominance signal, and export the second operation result to controlling module.And the 3rd with the door, in order to reception control signal and the 3rd carrier chrominance signal, and export the 3rd operation result to controlling module.
The present invention proposes a kind of driving method of backlight module, be suitable for driving several light emitting sources in backlight module, and at first this driving method comprises the following steps:, produce control signal, then produce the first carrier chrominance signal, after control signal and the first carrier chrominance signal are carried out the AND computing, and produce the first operation result.Last foundation the first operation result drives these light emitting sources.
According to the driving method of backlight module of the present invention, also comprise the following steps: at first, produce the second carrier chrominance signal and the 3rd carrier chrominance signal.After control signal is carried out the AND computing with the second carrier chrominance signal and the 3rd carrier chrominance signal respectively, and corresponding the second operation result and the 3rd operation result of producing.At last, control these light emitting sources according to the first operation result, the second operation result and the 3rd operation result.
The present invention proposes a kind of driving circuit of backlight module, wherein backlight module has several light emitting sources, and this backlight module is suitable for being configured on two-d display panel, and driving circuit comprises: the computing module, receive the first control signal, the second control signal and the first carrier chrominance signal, and after this computing module carries out the AND computing with the first control signal, the second control signal and the first carrier chrominance signal, produce the first operation result.And the control module, couple the computing module, drive the part at least of these light emitting sources in order to the foundation operation result.
According to the driving circuit of backlight module of the present invention, wherein the first control signal and the second control signal are respectively a brightness control signal and scanning drive signal, and wherein scanning drive signal is in order to the pixel in the control plane display panel.
Driving circuit according to backlight module of the present invention, wherein the computing module also receives the second carrier chrominance signal and the 3rd carrier chrominance signal, and the second carrier chrominance signal and the 3rd carrier chrominance signal are carried out the AND computing with the first control signal and the second control signal respectively, and corresponding generation the second operation result and the 3rd operation result are given the control module, make the control module drive these light emitting sources according to the first operation result, the second operation result and the 3rd operation result.
The present invention proposes a kind of driving method of backlight module, be suitable for driving a plurality of light emitting sources in backlight module, and this backlight module is suitable for being configured on two-d display panel, and at first this driving method comprises the following steps:, produce the first control signal, the second control signal, the first carrier chrominance signal, then, the first control signal, the second control signal and the first carrier chrominance signal are carried out the AND computing, and produce the first operation result.At last, drive these light emitting sources part at least according to the first operation result.
Driving method according to the described backlight module of preferred embodiment of the present invention, also comprise the following steps: at first, produce the second carrier chrominance signal, the 3rd carrier chrominance signal, then the first control signal and the second control signal are carried out the AND computing with the second carrier chrominance signal and the 3rd carrier chrominance signal respectively, and corresponding one second operation result and the 3rd operation result of producing.At last, control light emitting source according to the first operation result, the second operation result and the 3rd operation result.
The present invention proposes a kind of driving circuit of backlight module, wherein backlight module has a plurality of light emitting sources, and driving circuit comprises: the computing module, receive the first control signal, the second control signal, the 3rd control signal and the first carrier chrominance signal, and after the computing module carries out the AND computing with the first control signal, the second control signal and the first carrier chrominance signal, produce the first operation result.And the control module, couple the computing module, drive the part at least of light emitting source in order to the foundation operation result.
Driving circuit according to the described backlight module of preferred embodiment of the present invention, wherein the computing module more receives the second carrier chrominance signal and the 3rd carrier chrominance signal, and the second carrier chrominance signal and the 3rd carrier chrominance signal are carried out the AND computing with the first control signal, the second control signal and the 3rd control signal respectively, and corresponding generation one second operation result and the 3rd operation result are given the control module, make this control module and drive light emitting source according to the first operation result, the second operation result and the 3rd operation result.
The present invention proposes a kind of driving method of backlight module, be suitable for driving several light emitting sources in backlight module, and at first driving method comprises the following steps:, produces the first control signal, the second control signal and the 3rd control signal and the first carrier chrominance signal.Then, the first control signal, the second control signal and the first carrier chrominance signal are carried out the AND computing, and produce the first operation result.At last, drive light emitting source part at least according to the first operation result.
According to the driving method of the described backlight module of preferred embodiment of the present invention, also comprise the following steps: at first, produce the second carrier chrominance signal, the 3rd carrier chrominance signal.Then, the first control signal, the second control signal and the 3rd control signal are carried out the AND computing with the second carrier chrominance signal and the 3rd carrier chrominance signal respectively, and corresponding the second operation result and the 3rd operation result of producing.At last, control light emitting source according to the first operation result, the second operation result and the 3rd operation result.
The invention provides a kind of liquid crystal display, be characterized in, have above-mentioned backlight module and its driving circuit.
The present invention carries out the AND computing with control signal because adopting control signal to adjust colourity respectively by each carrier chrominance signal that the computing module will be inputted, and with colourity and the brightness of operation result input control module to adjust each light emitting source.Therefore, the present invention does not need to change with the pulse width modulation device power ratio of light emitting source, only needs to change the purpose that control signal namely reaches accurate adjustment light emitting source colourity and brightness.
Description of drawings
For above and other purpose of the present invention, feature and advantage can be become apparent, the below is especially exemplified by preferred embodiment, and coordinates appended graphicly, is described in detail below.
Fig. 1 illustrates and is the driving circuit calcspar according to a kind of backlight module of the first embodiment of the present invention.
Fig. 2 illustrates the sequential chart into the signal in Fig. 1.
Fig. 3 illustrates and is the flow chart of steps according to the driving method of the backlight module of the first embodiment of the present invention.
Fig. 4 illustrates and is the driving circuit calcspar according to a kind of backlight module of second embodiment of the invention.
Fig. 5 illustrates and is the flow chart of steps according to the driving method of the backlight module of second embodiment of the invention.
Fig. 6 illustrates the sequential chart into the signal in Fig. 4.
Fig. 7 illustrates and is the driving circuit calcspar according to a kind of backlight module of the third embodiment of the present invention.
Fig. 8 illustrates and is the flow chart of steps according to the driving method of the backlight module of third embodiment of the invention.
Fig. 9 illustrates the sequential chart into the signal in Fig. 7.
Figure 10 illustrates and is the driving circuit calcspar according to a kind of backlight module of the fourth embodiment of the present invention.
In figure, the main element symbol description is as follows:
100,400,700,1000: driving circuit
110: control chip
C
1: control signal
410,710: the first control chips
C
1a, C
1b: the first control signal
C
2a, C
2b: the second control signal
C
3b: the 3rd control signal
420,720: the second control chips
120,430,730: colourity is adjusted module
K
1: the first carrier chrominance signal
K
2: the second carrier chrominance signal
K
3: the 3rd carrier chrominance signal
130,440,740: the computing module
130a, 440a, 740a: first with the door
130b, 440b, 740b: second with the door
130c, 440c, 740c: the 3rd with the door
S
1: the first operation result
S
2: the second operation result
S
3: the 3rd operation result
140,450,750: control module
Ri, Gi, Bi: carrier chrominance signal receiving end
Ro: ruddiness control output end
Go: green glow control output end
Bo: blue light control output end
150,460,760,1060: backlight module
152,462,762: the first light emitting sources
154,464,764: the second light emitting sources
156,466,766: the three light emitting sources
1062: white light emitting diode
S310: produce control signal and the first carrier chrominance signal
S320: control signal and the first carrier chrominance signal are carried out the AND computing, and produce the first operation result
S330: drive light emitting source part at least according to the first operation result
S510: produce the first control signal, the second control signal and the first carrier chrominance signal
S520: the first control signal, the second control signal and the first carrier chrominance signal are carried out the AND computing, and produce the first operation result
S530: drive light emitting source according to the first operation result at least part of
S810: produce the first control signal, the second control signal, the 3rd control signal and the first carrier chrominance signal
S820: the first control signal, the second control signal and the 3rd control signal and the first carrier chrominance signal are carried out the AND computing, and produce the first operation result
S830: drive light emitting source according to the first operation result at least part of
Embodiment
The first embodiment
Fig. 1 illustrates and is the driving circuit calcspar according to a kind of backlight module of the first embodiment of the present invention.Please refer to Fig. 1, driving circuit 100 of the present invention goes for a liquid crystal display, is to drive backlight module 150.In driving circuit 100, comprised computing module 130 and controlled module 140.In the present embodiment, computing module 130 receives a control signal C at least
1With one first carrier chrominance signal K
1, its output is coupled to controls module 140, makes control module 140 can drive according to the output of computing module 130 backlight module 150.
In the present embodiment, control signal C
1Be for example brightness control signal, be applicable to adjust the brightness of backlight module 150, and the first carrier chrominance signal K
1Can be red GTG signal, be suitable for adjusting the GTG value of the redness of backlight module 150.
In driving circuit 100, can also dispose control chip 110 and colourity and adjust module 120.Wherein, control chip 110 can be used for exporting control signal C
1, colourity is adjusted module 120 can be used for exporting the first carrier chrominance signal K
1And in preferred embodiment, colourity is adjusted module 120 except exporting the first carrier chrominance signal K
1Give outside computing module 130, can also export the second carrier chrominance signal K
2With the 3rd carrier chrominance signal K
3Give computing module 130.Wherein, the second carrier chrominance signal K
2Be for example green GTG signal, and the 3rd carrier chrominance signal K
3It is for example blue GTG signal.When computing module 130 receives control signal C
1, and the first carrier chrominance signal K
1, the second carrier chrominance signal K
2With the 3rd carrier chrominance signal K
3The time, can be with the first carrier chrominance signal K
1, the second carrier chrominance signal K
2With the 3rd carrier chrominance signal K
3Respectively with control signal C
1Carry out the AND computing, and produce operation result S
1, S
2And S
3Give and control module 140.
Please continue with reference to Fig. 1, computing module 130 can comprise with door (AND) 130a, 130b and 130c and forming, and difference reception control signal C
1With carrier chrominance signal K
1, K
2And K
3In detail, couple respectively control chip 110 with two input ends of door 130a and colourity is adjusted module 120, to be used for reception control signal C
1With the first carrier chrominance signal K
1Similarly, be used for reception control signal C with door 130b
1With the second carrier chrominance signal K
2, and be used for reception control signal C with door 130c
1With the 3rd carrier chrominance signal K
3When computing module 130 has received control signal C
1, and carrier chrominance signal K
1, K
2And K
3After, can produce operation result S
1, S
2And S
3Give and control module 140.
In addition, control module 140 and have carrier chrominance signal receiving end Ri, Gi and Bi, be used for receiving respectively operation result S
1, S
2And S
3Whereby, controlling module 140 just can be according to operation result S
1, S
2And S
3 Drive backlight module 150.
In general, backlight module 150 can have many light emitting sources.And in the present embodiment, 150 of backlight modules comprise the first light emitting source 152, the second light emitting source 154 and the 3rd light emitting source 156, and these light emitting sources are for example red light-emitting diode, green light LED and blue light-emitting diode.And in backlight module 150, the light emitting diode of various same colors is that the mode with serial or parallel connection connects.For example, the cathode terminal of each red light-emitting diode all is coupled to the cathode terminal of next red light-emitting diode.In addition, the light emitting diode of different colours is to be coupled in parallel to control module 140.That is to say, the anode tap of first red diodes 152 is coupled to the ruddiness control output end Ro that controls module 140, the anode tap of first green light LED 154 is coupled to the green glow control output end Go that controls module 140, and the anode tap of first blue light-emitting diode 156 is coupled to the blue light control output end Bo that controls module 140.
Hold above-mentionedly, if backlight module uses when deciding the environment of electric current, light emitting source can form the structure in independent loop.
Fig. 2 illustrates the sequential chart into the signal in Fig. 1.Please merge and see figures.1.and.2, C in Fig. 2
1Represent the sequential of control signal, K
1, K
2, K
3Represent respectively the sequential of carrier chrominance signal, and S
1, S
2, S
3Represent respectively the sequential of operation result.Due to control signal C
1Work period longer, so the present invention claims control signal C
1Be large package, and carrier chrominance signal K
1, K
2And K
3Work period shorter, therefore be called as little package.
When receiving control signal C with door 130a
1With the first carrier chrominance signal K
1The time, can will both carry out the AND computing, and produce operation result S
1Give and control module.Relatively, can be with control signal C with door 130b
1With the second carrier chrominance signal K
2Carry out the AND computing and produce operation result S
2Give to control module 140, with door 130c can be with control signal C
1With the 3rd carrier chrominance signal K
3Carry out the AND computing and produce operation result S
3Give and control module 140.Whereby, controlling module 140 just can be according to operation result S
1, S
2And S
3Adjust the light emitting source 152 in backlight module 150,154 and 156 GTG value.
And in preferred embodiment, the proportional range of large package and little package can be controlled between 6 * 10
-6And between 0.25, to avoid the inhomogeneous of operation result, cause human eye perceives to go out flicker (flicker) phenomenon.
Above-mentioned technology is done one arrange, the present invention has also proposed a kind of driving method of backlight module.Please refer to Fig. 3, it illustrates the flow chart of steps into the driving method of the backlight module of implementing according to the present invention first.In Fig. 3, meeting of the present invention first produces control signal and the first carrier chrominance signal (step S310), control chip 110 produces control signal, it is for example a brightness control signal, and with each and the door (input end of 130a～130c) of this control signal input computing module 130, and colourity is adjusted module 120 and is produced the first carrier chrominance signal, the second carrier chrominance signal and the 3rd carrier chrominance signals, and with each and door (another input end of 130a～130c) of these carrier chrominance signals input computing modules 130.Secondly, control signal and the first carrier chrominance signal are carried out the AND computing, and produce the first operation result (step S320), identical, second with door 130b with the 3rd with 130c reception control signal and carry out the AND computing and produce the second operation result and the 3rd operation result with the second carrier chrominance signal and the 3rd carrier chrominance signal respectively separately.At last, drive light emitting source part (step S330) at least according to the first operation result, control module 140 and drive the first light emitting source according to this first operation result, and drive the second light emitting source 154 and the 3rd light emitting source 156 according to the second operation result and the 3rd operation result.
It is worth mentioning that, in the present embodiment, the control signal that driving circuit 100 receives is not defined as single kind of control signal, also can produce the various control signal by different control chips, the embodiment of the multi-control signal of the graphic explanation of collocation in following examples.
The second embodiment
Fig. 4 illustrates and is the driving circuit calcspar according to a kind of backlight module of the second embodiment of the present invention.The device of the present embodiment is similar to the device of the first embodiment, therefore only illustrate that it does not exist together.Please refer to Fig. 4, driving circuit 400 of the present invention can be used for driving backlight module 460, and comprises computing module 440 and control module 450.In the present embodiment, computing module 440 receives one first control signal C at least
1aWith one first carrier chrominance signal K
1Specifically, in the present embodiment, computing module 440 also can receive the second control signal C
2a, its output is coupled to controls module 450, makes control module 450 can drive according to the output of computing module 440 backlight module 460.
In the present embodiment, the first control signal C
1aBe for example brightness control signal, be applicable to adjust the brightness of backlight module 460, the second control signal C
2aBe for example the scanning drive signal of display, can be used to the pixel in the control plane display panel.Similarly, the first carrier chrominance signal K
1Can be equally also red GTG signal, be suitable for adjusting the GTG value of the redness of backlight module 460.
In driving circuit 400, can also dispose the first control chip 410, the second control chip 420 and colourity and adjust module 430.Wherein, the first control chip 410 can be used for exporting the first control signal C
1a, the second control chip 420 can be used for exporting the second control signal C
2a, colourity is adjusted module 430 can be used for exporting the first carrier chrominance signal K
1And in preferred embodiment, colourity is adjusted module 430 except exporting the first carrier chrominance signal K
1Give outside computing module 440, more can export the second carrier chrominance signal K
2With the 3rd carrier chrominance signal K
3Give computing module 440.Wherein, the second carrier chrominance signal K
2Be for example green GTG signal, and the 3rd carrier chrominance signal K
3It is for example blue GTG signal.When computing module 440 receives the first control signal C
1a, the second control signal C
2a, and the first carrier chrominance signal K
1, the second carrier chrominance signal K
2With the 3rd carrier chrominance signal K
3The time, can be with the first carrier chrominance signal K
1, the second carrier chrominance signal K
2With the 3rd carrier chrominance signal K
3With the first control signal C
1aAnd the second control signal C
2aCarry out the AND computing Deng two kinds of control signals, and produce operation result S
1, S
2And S
3Give and control module 450.
Please continue with reference to Fig. 4, computing module 440 can comprise with door 440a, 440b and 440c and forming, and receive respectively the first control signal C
1a, the second control signal C
2aWith carrier chrominance signal K
1, K
2And K
3In detail, couple respectively the first control chip 410, the second control chip 420 and colourity with three input ends of door 440a and adjust module 430, to be used for receiving the first control signal C
1a, the second control signal C
2aWith the first carrier chrominance signal K
1Similarly, be used for receiving the first control signal C with door 440b
1a, the second control signal C
2aWith the second carrier chrominance signal K
2, and be used for receiving the first control signal C with door 440c
1a, the second control signal C
2aWith the 3rd carrier chrominance signal K
3When computing module 440 has received the first control signal C
1a, the second control signal C
2a, and carrier chrominance signal K
1, K
2And K
3After, can produce operation result S
1, S
2And S
3Give and control module 450.
Fig. 6 illustrates the sequential chart into the signal in Fig. 4.Please merge with reference to Fig. 4 and Fig. 6, similarly, the first control signal C
1aAnd the second control signal C
2aCan be called as large package, and carrier chrominance signal K
1, K
2And K
3Can be called as little package.
When receiving the first control signal C with door 440a
1a, the second control signal C
2aWith the first carrier chrominance signal K
1The time, the three can be carried out the AND computing, and produce operation result S
1Give and control module 450.Relatively, can be with the first control signal C with door 440b
1a, the second control signal C
2aWith the second carrier chrominance signal K
2Carry out the AND computing and produce operation result S
2Give to control module 450, with door 440c can be with the first control signal C
1a, the second control signal C
2aWith the 3rd carrier chrominance signal K
3Carry out the AND computing and produce operation result S
3Give and control module 450.Whereby, controlling module 450 just can be according to operation result S
1, S
2And S
3Adjust the light emitting source 462 in backlight module 460,464 and 466 GTG value.
The present invention has also proposed a kind of driving method of backlight module.Please refer to Fig. 5, it illustrates the flow chart of steps into the driving method of the backlight module of implementing according to the present invention second.In Fig. 5, meeting of the present invention first produces the first control signal, the second control signal and the first carrier chrominance signal (step S510), and the first control chip 410 produces the first control signal C
1a, be for example a brightness control signal, the second control chip 420 produces the second control signal C
2a, for example be that one scan drives signal, and with each and the door (input end of 440a～440c), and colourity is adjusted module 430 and produced the first carrier chrominance signal K of these control signals input computing modules 440
1, the second carrier chrominance signal K
2And the 3rd carrier chrominance signal K
3, and each and the door (input end of 440a～440c) that these carrier chrominance signals are sequentially inputted computing module 440.Secondly, the first control signal, the second control signal and the first carrier chrominance signal are carried out the AND computing, and produce the first operation result (step S520), identical, second receives the first control signal C with door 440b and the 3rd separately with door 440c
1aWith the second control signal C
2aAnd respectively with the second carrier chrominance signal K
2And the 3rd carrier chrominance signal K
3Carry out the AND computing and produce the second operation result S
2And the 3rd operation result S
3At last, drive light emitting source part (step S530) at least according to the first operation result, control module 450 and drive the first light emitting source according to this first operation result, and drive the second light emitting source 464 and the 3rd light emitting source 466 according to the second operation result and the 3rd operation result.
In addition, the control signal that receives at driving circuit 400 is not defined as single kind of control signal, also can produce the various control signal by different control chips, and single control chip is not defined as to produce single kind of control signal, also can produce the various control signal by same control chip.In following examples, the single control chip of the graphic explanation of collocation produces the embodiment of various control signal.
The 3rd embodiment
Fig. 7 illustrates and is the driving circuit calcspar according to a kind of backlight module of the third embodiment of the present invention.The device of the present embodiment is similar to the device of the first embodiment, therefore only illustrate that it does not exist together.Please refer to Fig. 7, driving circuit 700 of the present invention can be used for driving backlight module 760, and comprises computing module 740 and control module 750.In the present embodiment, computing module 740 receives one first control signal C at least
1b, the second control signal C
2bWith one first carrier chrominance signal K
1Do not exist together with embodiment before, be that computing module 740 also can one the 3rd control signal C of reception more
3bSimilarly, the output of computing module 740 is to be coupled to control module 750.Whereby, make control module 750 can drive according to the output of computing module 740 backlight module 760.
In the present embodiment, the first control signal C
1bBe for example other control signal, can be used for to backlight module 760 or display carries out the adjustment of specific function, be not restricted in this present invention.
In driving circuit 700, can also dispose the first control chip 710, the second control chip 720 and colourity and adjust module 730.Wherein, the first control chip 710 can be used for exporting the first control signal C
1bAnd the second control signal C
2b, the second control chip 720 can be used for exporting the 3rd control signal C
3b, colourity is adjusted module 730 and can be used for exporting different carrier chrominance signal R1, G1, B1, R2, G2 and B2 to computing module 740.When computing module 740 receives the first control signal C
1b, the second control signal C
2b, the 3rd control signal C
3b, and the first carrier chrominance signal R
1And R
2, the second carrier chrominance signal G
1And G
2With the 3rd carrier chrominance signal B
1And B
2The time, can be with above-mentioned three and the first control signal C
1b, the second control signal C
2bAnd the 3rd control signal C
3bCarry out the AND computing Deng three kinds of control signals, and produce operation result S
1, S
2And S
3Give and control module 750.
Please continue with reference to Fig. 7, computing module 740 can comprise with door 740a, 740b and 740c and forming, and receive respectively the first control signal C
1b, the second control signal C
2b, the 3rd control signal C
3b, and carrier chrominance signal R1, G1, B1, R2, G2 and B2.In detail, couple respectively the first control chip 710, the second control chip 720 and colourity with four input ends of door 740a and adjust module 730, to be used for receiving the first control signal C
1b, the second control signal C
2b, the 3rd control signal C
3bWith the first carrier chrominance signal R
1And R
2Similarly, be used for receiving the first control signal C with door 740b
1b, the second control signal C
2b, the 3rd control signal C
3bWith the second carrier chrominance signal G
1And G
2, and be used for receiving the first control signal C with door 740c
1b, the second control signal C
2b, the 3rd control signal C
3bWith the 3rd carrier chrominance signal B
1And B
2When computing module 740 has received the first control signal C
1b, the second control signal C
2b, the 3rd control signal C
3b, and after carrier chrominance signal R1, G1, B1, R2, G2 and B2, can produce operation result S
1, S
2And S
3Give and control module 750.
Fig. 9 illustrates the sequential chart into the signal in Fig. 7.Please merge with reference to Fig. 7 and Fig. 9, when receiving the first control signal C with door 740a
1b, the second control signal C
2b, the 3rd control signal C
3bWith the first carrier chrominance signal R
1And R
2The time, the three can be carried out the AND computing, and produce operation result S
1Give and control module 750.Relatively, can be with the first control signal C with door 740b
1b, the second control signal C
2b, the 3rd control signal C
3bWith the second carrier chrominance signal G
1And G
2Carry out the AND computing and produce operation result S
2Give to control module 750, with door 740c can be with the first control signal C
1b, the second control signal C
2b, the 3rd control signal C
3bWith the 3rd carrier chrominance signal B
1And B
2Carry out the AND computing and produce operation result S
3Give and control module 750.Whereby, controlling module 750 just can be according to operation result S
1, S
2And S
3Adjust the light emitting source 762 in backlight module 760,764 and 766 GTG value.
The present invention proposes a kind of driving method of backlight module.Please refer to Fig. 8, it illustrates the flow chart of steps into the driving method of the backlight module of implementing according to the present invention the 3rd.In Fig. 8, the present invention can produce the first control signal, the second control signal, the 3rd control signal and the first carrier chrominance signal (step S810).The first control chip 710 produces the first control signal C
1b, be for example a new technology signal, and produce the second control signal C
2b, for example drive signal for one scan.The second control chip 720 produces the 3rd control signal C
3b, be for example a brightness control signal.Then with each and the door (input end of 740a～740c) of these control signals input computing modules 740.And colourity is adjusted module 730 and is produced the first carrier chrominance signal, the second carrier chrominance signal and the 3rd carrier chrominance signals, and sequentially with each and the door (input end of 740a～740c) of these carrier chrominance signals input computing modules 740.Secondly, the first control signal, the second control signal and the 3rd control signal and the first carrier chrominance signal are carried out the AND computing, and produce the first operation result (step S820), identical, second receives the first control signal C with door 740b and the 3rd separately with door 740c
1b, the second control signal C
2bWith the 3rd control signal C
3bAnd respectively with the second carrier chrominance signal K
2And the 3rd carrier chrominance signal K
3Carry out the AND computing and produce the second operation result S
2And the 3rd operation result S
3At last, drive light emitting source part (step S830) at least according to the first operation result, control module 750 and drive the first light emitting source 762 according to this first operation result, and drive the second light emitting source 764 and the 3rd light emitting source 766 according to the second operation result and the 3rd operation result.
The 4th embodiment
Figure 10 illustrates and is the driving circuit calcspar according to a kind of backlight module of the fourth embodiment of the present invention.Please refer to Figure 10, then in the fourth embodiment of the present invention, be different from the light emitting source that aforesaid embodiment is used for controlling different colours.In the present embodiment, the backlight module 1060 that driving circuit 1000 drives can only have the light emitting source of solid color, is for example white light emitting diode 1062.
In driving circuit 1000, comprised the computing module 1040 to realize with door.In the present embodiment, receive the carrier chrominance signal of white light with one of them input end of door 1040, another input end can receive above-mentioned any control signal, and couples with the output of door 1040 and control module 1050.Whereby, control module 1050 and just can drive backlight module 1060 according to the carrier chrominance signal and the control signal that receive with door 1040.
Select in embodiment at other, control signal can be phase control signal, is the light emitting source tandem of synchronous different rows.In addition, carrier chrominance signal can be the shading value control signal, is the brightness of controlling light emitting source.
In sum, driving circuit of the present invention is because adopting the computing module that control signal and carrier chrominance signal are carried out the AND computing, and the package scale dimension of control signal and carrier chrominance signal is held in fixed range, therefore need not use the pulse width modulation device just can be fast and control to accurately required colourity, brightness or pixel, and can not have influence on colourity because adjusting the functions such as brightness or resolution, and can not cause because output waveform is inhomogeneous the perceptible scintillation of naked eyes.
Although the present invention discloses as above with preferred embodiment; so it is not to limit the present invention, any person skilled in the art, without departing from the spirit and scope of the present invention; when can do a little change and retouching, so protection scope of the present invention is with being as the criterion that claims scope is defined.
Claims (14)
1. the driving circuit of a backlight module, is characterized in that, described backlight module has most light emitting sources, and described driving circuit comprises:
One computing module receives a control signal and one first carrier chrominance signal, and to produce one first operation result, described computing module carries out described control signal and described the first carrier chrominance signal the AND computing and produces described the first operation result; And
One controls module, couples described computing module, in order to drive the part at least of described light emitting source according to described the first operation result.
2. the driving circuit of backlight module as claimed in claim 1, is characterized in that, described control signal is a brightness control signal.
3. the driving circuit of backlight module as claimed in claim 1, it is characterized in that, described computing module also receives one second carrier chrominance signal and one the 3rd carrier chrominance signal, and described the second carrier chrominance signal and described the 3rd carrier chrominance signal are carried out the AND computing with described control signal respectively, and corresponding generation one second operation result and one the 3rd operation result are given described control module, make described control module drive described light emitting source according to described the first operation result, described the second operation result and described the 3rd operation result.
4. the driving circuit of backlight module as claimed in claim 3, is characterized in that, described computing module comprises:
One first with door, in order to receiving described control signal and described the first carrier chrominance signal, and export described the first operation result to described control module;
One second with door, in order to receiving described control signal and described the second carrier chrominance signal, and export described the second operation result to described control module; And
One the 3rd with door, in order to receiving described control signal and described the 3rd carrier chrominance signal, and export described the 3rd operation result to described control module.
5. the driving circuit of backlight module as claimed in claim 1, is characterized in that, described each light emitting source comprises a red light-emitting diode, a green light LED and a blue light-emitting diode.
6. the driving method of a backlight module, be suitable for driving most light emitting sources in described backlight module, it is characterized in that, described driving method comprises the following steps;
Produce a control signal;
Produce one first carrier chrominance signal; And
Described control signal and described the first carrier chrominance signal are carried out the AND computing, and produce one first operation result, to drive the part at least of described light emitting source according to described the first operation result.
7. the driving method of backlight module as claimed in claim 6, is characterized in that, also comprises the following steps:
Produce one second carrier chrominance signal;
Produce one the 3rd carrier chrominance signal; And
Described control signal is carried out the AND computing with described the second carrier chrominance signal and described the 3rd carrier chrominance signal respectively, and corresponding one second operation result and one the 3rd operation result of producing, to control described light emitting source according to described the first operation result, described the second operation result and described the 3rd operation result.
8. the driving circuit of a backlight module, is characterized in that, described backlight module has most light emitting sources, and described backlight module is suitable for being configured on a two-d display panel, and described driving circuit comprises:
One computing module, receive one first control signal, one second control signal and one first carrier chrominance signal, and after described computing module carries out the AND computing with described the first control signal, described the second control signal and described the first carrier chrominance signal, produce one first operation result; And
One controls module, couples described computing module, in order to drive the part at least of described light emitting source according to described operation result.
9. the driving circuit of backlight module as claimed in claim 8, it is characterized in that, described the first control signal and described the second control signal are respectively a brightness control signal and one scan drives signal, and wherein said scanning drive signal is the pixel of controlling in described two-d display panel.
10. the driving circuit of backlight module as claimed in claim 8, it is characterized in that, described computing module also receives one second carrier chrominance signal and one the 3rd carrier chrominance signal, and described the second carrier chrominance signal and described the first control signal and described the second control signal are carried out the AND computing, described the 3rd carrier chrominance signal and described the first control signal and described the second control signal are carried out the AND computing, and corresponding generation one second operation result and one the 3rd operation result are given described control module, make described control module according to described the first operation result, described the second operation result and described the 3rd operation result drive described light emitting source.
11. the driving method of a backlight module is characterized in that, is suitable for driving in described backlight module most light emitting sources, and described backlight module is suitable for being configured on a two-d display panel, and described driving method comprises the following steps;
Produce one first control signal;
Produce one second control signal;
Produce one first carrier chrominance signal; And
Described the first control signal, described the second control signal and described the first carrier chrominance signal are carried out the AND computing, and produce one first operation result, to drive described light emitting source part at least according to described the first operation result.
12. the driving circuit of a backlight module is characterized in that, described backlight module has most light emitting sources, and described driving circuit comprises:
One computing module, receive one first control signal, one second control signal, one the 3rd control signal and one first carrier chrominance signal, and after described computing module carries out the AND computing with described the first control signal, described the second control signal and described the first carrier chrominance signal, produce one first operation result; And
One controls module, couples described computing module, in order to drive the part at least of described light emitting source according to described operation result.
13. the driving method of a backlight module is suitable for driving most light emitting sources in described backlight module, it is characterized in that, described driving method comprises the following steps;
Produce one first control signal, one second control signal and one the 3rd control signal;
Produce one first carrier chrominance signal; And
Described the first control signal, described the second control signal, described the 3rd control signal and described the first carrier chrominance signal are carried out the AND computing, and produce one first operation result, to drive the part at least of described light emitting source according to described the first operation result.
14. a liquid crystal display is characterized in that, comprising:
One display panels;
One backlight module has most light emitting sources; And
One drive circuit, in order to drive described backlight module, described driving circuit comprises:
One computing module receives a control signal and one first carrier chrominance signal, carries out after the AND computing to produce one first operation result; And
One controls module, couples described computing module, in order to export to drive the part at least of described light emitting source according to described the first operation result.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710141956 CN101364382B (en) | 2007-08-10 | 2007-08-10 | Liquid crystal display, back light module driving circuit and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710141956 CN101364382B (en) | 2007-08-10 | 2007-08-10 | Liquid crystal display, back light module driving circuit and method |
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| CN101364382B true CN101364382B (en) | 2013-05-08 |
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|---|---|---|---|---|
| US4715687A (en) * | 1986-12-23 | 1987-12-29 | International Business Machines Corporation | Color variation in a passively illuminated display using fluorescent light sources |
| CN1892793A (en) * | 2005-06-30 | 2007-01-10 | Lg.菲利浦Lcd株式会社 | Apparatus and method of driving liquid crystal display device |
| CN1945405A (en) * | 2005-10-07 | 2007-04-11 | 夏普株式会社 | Back light lamp and display device having this device, method for driving and adjusting the device |
| EP1775711A1 (en) * | 2004-07-13 | 2007-04-18 | Matsusita Electric Industrial Co., Ltd. | Liquid crystal display and its light source driving method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4715687A (en) * | 1986-12-23 | 1987-12-29 | International Business Machines Corporation | Color variation in a passively illuminated display using fluorescent light sources |
| EP1775711A1 (en) * | 2004-07-13 | 2007-04-18 | Matsusita Electric Industrial Co., Ltd. | Liquid crystal display and its light source driving method |
| CN1892793A (en) * | 2005-06-30 | 2007-01-10 | Lg.菲利浦Lcd株式会社 | Apparatus and method of driving liquid crystal display device |
| CN1945405A (en) * | 2005-10-07 | 2007-04-11 | 夏普株式会社 | Back light lamp and display device having this device, method for driving and adjusting the device |
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| Title |
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| JP特开2005-215360A 2005.08.11 |
| JP特开2006-30309A 2006.02.02 |
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