CN102306484A - Control circuit generating backlight drive current and method thereof - Google Patents
Control circuit generating backlight drive current and method thereof Download PDFInfo
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- CN102306484A CN102306484A CN201110253819A CN201110253819A CN102306484A CN 102306484 A CN102306484 A CN 102306484A CN 201110253819 A CN201110253819 A CN 201110253819A CN 201110253819 A CN201110253819 A CN 201110253819A CN 102306484 A CN102306484 A CN 102306484A
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Abstract
The invention provides a control circuit generating backlight drive current. The control circuit comprises a sequential control circuit, a resistor and a backlight drive circuit. The sequential control circuit is used for receiving a first pulse width light-adjusting signal and an image signal, and converting the first pulse width light-adjusting signal into a second pulse width light-adjusting signal according to the image signal, wherein a work cycle of the second pulse width light-adjusting signal is in a proportion with a work cycle of the first pulse width light-adjusting signal. The backlight drive circuit is coupled to the sequential control circuit and a resistor, and is used for receiving the second pulse width light-adjusting signal and generating backlight drive current according to the second pulse width light-adjusting signal and the resistor. According to the invention, a disadvantage that display panel brightness is low when a display panel displays a three-dimensional image is improved, number of passive assemblies and layout wiring are reduced, and cost and manufacture difficulty are lowered.
Description
Technical field
The invention relates to a kind of control circuit and its method that produces the backlight drive electric current; Especially refer to that a kind of sequential control circuit that utilizes is according to different image signals; Produce different pulse width light modulation signal, so that backlight drive circuit produces control circuit and its method of corresponding backlight drive electric current.
Background technology
Please see figures.1.and.2, Fig. 1 illustrates that for prior art synoptic diagram and Fig. 2 of the control circuit 100 of control 2D/3D backlight drive electric current are the synoptic diagram for the control circuit 200 of prior art explanation control 2D/3D backlight drive electric current.As shown in Figure 1, control circuit 100 comprises a sequential control circuit 102, a backlight drive circuit 104, a switch 106 and two resistance R 1, R2.Sequential control circuit 102 is in order to receiving an image signal IS, and according to image signal IS, produces a pulse width light modulation signal PWM to a backlight drive circuit 104 and 2D/3D signal a to switch 106.When image signal IS is that the 2D/3D signal is to be a logic high potential when being a 3D image signal, cause switch 106 to be opened.Backlight drive circuit 104 can produce a bigger backlight drive current IS ET (3D backlight drive electric current) according to resistance R 1 (small resistor).In like manner, when image signal IS is that the 2D/3D signal is to be a logic low potential when being a 2D image signal, cause switch 106 to be closed.Backlight drive circuit 104 can produce a less backlight drive current IS ET (2D backlight drive electric current) according to resistance R 1 resistance in series R2 (big resistance).
As shown in Figure 2, control circuit 200 comprises a sequential control circuit 202, a backlight drive circuit 204, two switches 206,208 and two resistance R 1, R2.When an image signal IS is that the 2D/3D signal is to be logic high potential when being a 3D image signal, cause switch 206 unlatchings, switch 208 to be closed.Backlight drive circuit 204 can produce a bigger backlight drive current IS ET (3D backlight drive electric current) according to resistance R 1 (small resistor).In like manner, when image signal IS is that the 2D/3D signal is to be logic low potential when being a 2D image signal, cause that switch 206 cuts out, switch 208 is opened.Backlight drive circuit 204 can produce a less backlight drive current IS ET (2D backlight drive electric current) according to resistance R 2 (big resistance).
Though; Control circuit 100 can be according to image signal IS with control circuit 200; Adjustment backlight drive current IS ET, but control circuit 100 and control circuit 200 must be added the cabling of extra passive component and increase circuit layout, the degree of difficulty that has improved cost and made.
Summary of the invention
One embodiment of the invention provide a kind of control circuit that produces the backlight drive electric current.This control circuit comprises a sequential control circuit, a resistance and a backlight drive circuit.This sequential control circuit system is in order to receive one first a pulse width light modulation signal and an image signal; And according to this image signal; Changing this first pulse width light modulation signal is one second pulse width light modulation signal, and wherein the work period of this second pulse width light modulation signal becomes a ratio with the work period of this first pulse width light modulation signal; This backlight drive circuit is to be coupled to this sequential control circuit and this resistance, in order to receiving this second pulse width light modulation signal, and according to this second pulse width light modulation signal and this resistance, produces a backlight drive electric current.
Another embodiment of the present invention provides a kind of display system.This display system comprises a display panel, a sequential control circuit, a resistance and a backlight drive circuit.This sequential control circuit is in order to receive one first a pulse width light modulation signal and an image signal; And according to this image signal; Changing this first pulse width light modulation signal is one second pulse width light modulation signal, and wherein the work period of this second pulse width light modulation signal becomes a ratio with the work period of this first pulse width light modulation signal; This backlight drive circuit is to be coupled to this sequential control circuit and this resistance, in order to receiving this second pulse width light modulation signal, and according to this second pulse width light modulation signal and this resistance, produces a backlight drive electric current; Wherein this backlight drive electric current is in order to drive a light-emitting diode (LED) backlight module of this display panel.
Another embodiment of the present invention provides a kind of generation backlight drive method of current.This method comprises reception one first a pulse width light modulation signal and an image signal; According to this image signal, changing this first pulse width light modulation signal is one second pulse width light modulation signal; According to this second pulse width light modulation signal and a resistance that is coupled to a backlight drive circuit, produce one first backlight drive electric current.
The present invention provides a kind of control circuit and its method that produces the backlight drive electric current.This control circuit is to utilize a sequential control circuit according to different image signals with its method, and changing one first pulse width light modulation signal is one second pulse width light modulation signal.Then, a backlight drive circuit can produce a corresponding backlight drive electric current according to this second pulse width light modulation signal.In addition, this backlight drive circuit is according to the backlight drive electric current that this second pulse width light modulation signal of work period 100% is produced, and is to be the maximal value corresponding to the backlight drive electric current of a 3D image signal.So, the present invention can promote the brightness of this display panel when the ㄧ display panel shows a 3D image, and when showing this 2D image, keeps the normal brightness of this display panel.Therefore, the present invention not only can improve this display panel when showing this 3D image, and the shortcoming that this display panel brightness is lower also can reduce the number and the layout cabling of passive component, the degree of difficulty that has reduced cost and made.
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Description of drawings
Fig. 1 is the synoptic diagram for the control circuit of prior art explanation control 2D/3D backlight drive electric current.
Fig. 2 is the synoptic diagram for the control circuit of prior art explanation control 2D/3D backlight drive electric current.
Fig. 3 is a kind of synoptic diagram that produces the control circuit of backlight drive electric current of one embodiment of the invention explanation.
Fig. 4 be for the explanation sequential control circuit according to image signal, changing the first pulse width light modulation signal is the synoptic diagram of the second pulse width light modulation signal.
Fig. 5 be for the explanation sequential control circuit according to image signal, changing the first pulse width light modulation signal is the synoptic diagram of the second pulse width light modulation signal.
Fig. 6 be for the explanation sequential control circuit according to image signal, changing the first pulse width light modulation signal is the synoptic diagram of the second pulse width light modulation signal and the 3rd pulse width light modulation signal.
Fig. 7 illustrates a kind of process flow diagram that produces the backlight drive method of current for ㄧ embodiment in addition of the present invention.
Fig. 8 illustrates a kind of process flow diagram that produces the backlight drive method of current for ㄧ embodiment in addition of the present invention.
[primary clustering symbol description]
100,200,300 control circuits
102,202,302 sequential control circuits
106,206,208 switches
104,204,306 backlight drive circuits
304, R1, R2 resistance
308 display panels
310 light-emitting diode (LED) backlight modules
The IS image signal
ISET backlight drive electric current
PWM pulse width light modulation signal
The PWMI first pulse width light modulation signal
The PWMO second pulse width light modulation signal
PWMO ' the 3rd pulse width light modulation signal
700 to 710,800 to 816 steps
Embodiment
Please with reference to Fig. 3, Fig. 3 is a kind of synoptic diagram that produces the control circuit 300 of backlight drive electric current of one embodiment of the invention explanation.Control circuit 300 comprises a sequential control circuit 302, a resistance 304 and a backlight drive circuit 306.Sequential control circuit 302 is in order to receive one first a pulse width light modulation signal (PWMI) and an image signal (IS); And according to image signal (IS); Changing the first pulse width light modulation signal (PWMI) is one second pulse width light modulation signal (PWMO), and wherein the work period of the second pulse width light modulation signal (PWMO) becomes a ratio with the work period of the first pulse width light modulation signal (PWMI); Backlight drive circuit 306 is to be coupled to sequential control circuit 302 and resistance 304; In order to receive the second pulse width light modulation signal (PWMO); And according to second pulse width light modulation signal (PWMO) and the resistance 304; Produce a backlight drive electric current (ISET), wherein backlight drive electric current (ISET) is in order to drive a light-emitting diode (LED) backlight module 310 of a display panel 308.
Please with reference to Fig. 4, Fig. 4 be for explanation sequential control circuit 302 according to image signal IS, changing the first pulse width light modulation signal PWMI is the synoptic diagram of the second pulse width light modulation signal PWMO.As shown in Figure 4; Maximal value with 3D backlight drive electric current is 40mA; And the maximal value of 2D backlight drive electric current is that 20mA is an example; The default value of the backlight drive current IS ET that setting backlight drive circuit 306 is produced is 40mA, that is the default value of backlight drive current IS ET is the maximal value for 3D backlight drive electric current.But it is 40mA that the present invention is not limited to the maximal value of 3D backlight drive electric current, and the maximal value of 2D backlight drive electric current is 20mA.
When image signal IS is when being a 3D image signal, sequential control circuit 302 is according to image signal IS, and changing the first pulse width light modulation signal PWMI is the second pulse width light modulation signal PWMO.As shown in Figure 4; The work period of the first pulse width light modulation signal PWMI is to be 100% o'clock; So the work period of the second pulse width light modulation signal PWMO also is 100%; To keep backlight drive current IS ET (corresponding to the 3D image signal) is 40mA; That is be when being 100% when the work period of the second pulse width light modulation signal PWMO; Light-emitting diode (LED) backlight module 310 can produce the high-high brightness corresponding to the 3D image signal according to backlight drive current IS ET (40mA).When image signal IS is when being a 2D image signal, sequential control circuit 302 is according to image signal IS, and changing the first pulse width light modulation signal PWMI is the second pulse width light modulation signal PWMO.As shown in Figure 4; The work period of the first pulse width light modulation signal PWMI is to be 100% o'clock; So the work period of the second pulse width light modulation signal PWMO is to be 50%; To keep backlight drive current IS ET (corresponding to the 2D image signal) is 20mA; That is be when being 50% (corresponding to 100% work period of 2D image signal) when the work period of the second pulse width light modulation signal PWMO; Light-emitting diode (LED) backlight module 310 can produce the high-high brightness corresponding to the 2D image signal according to backlight drive current IS ET (20mA).
Please with reference to Fig. 5, Fig. 5 be for explanation sequential control circuit 302 according to image signal IS, changing the first pulse width light modulation signal PWMI is the synoptic diagram of the second pulse width light modulation signal PWMO.As shown in Figure 5, when image signal IS is during for the 3D image signal, sequential control circuit 302 also can be adjusted work period and the frequency of the second pulse width light modulation signal PWMO according to the actual demand of image signal IS (3D image signal).For example; If it is 4mA (that is the work period of the first pulse width light modulation signal PWMI is 10%) that image signal IS (3D image signal) needs backlight drive current IS ET, then can to adjust the work period of the second pulse width light modulation signal PWMO be 10% to sequential control circuit 302.Therefore, backlight drive circuit 306 can produce the backlight drive current IS ET (4mA) corresponding to image signal IS (3D image signal) according to second pulse width light modulation signal PWMO (work period 10%) and the resistance 304.In addition; Because the work period of the first pulse width light modulation signal PWMI is 10%; So when image signal IS is during for the 2D image signal; Sequential control circuit 302 can be according to image signal IS (2D image signal); The work period of adjusting the second pulse width light modulation signal PWMO is 5%, that is corresponding to 10% (10% 50% be 5%) work period of 2D image signal.Therefore, backlight drive circuit 306 can produce the backlight drive current IS ET (2mA) corresponding to image signal IS (2D image signal) according to second pulse width light modulation signal PWMO (work period 5%) and the resistance 304.
Please with reference to Fig. 6; Fig. 6 be for the explanation sequential control circuit 302 according to image signal IS (2D image signal and 3D image signal), changing the first pulse width light modulation signal PWMI is the synoptic diagram of the second pulse width light modulation signal PWMO and the 3rd pulse width light modulation signal PWMO '.As shown in Figure 6; When image signal IS be for the 2D image signal and corresponding to work period of the first pulse width light modulation signal PWMI of 2D image signal be when being 100%; Work period corresponding to the second pulse width light modulation signal PWMO of 2D image signal is to be 50%, is 20mA to keep backlight drive current IS ET (corresponding to the 2D image signal).When image signal IS is during for the 3D image signal; Since the opening time of shutter glasses or liquid crystal phase retardation film (liquid crystal retarder) be the first pulse width light modulation signal PWMI work period 32%, so corresponding to the work period of the 3rd pulse width light modulation signal PWMO ' of 3D image signal be to be 32%.But the present invention be not limited to the opening time of shutter glasses or liquid crystal phase retardation film (liquid crystal retarder) be the first pulse width light modulation signal PWMI work period 32%.So, backlight drive current IS ET (corresponding to the 3D image signal) is about 12.8mA (40mA*32%).
In addition, in another embodiment of the present invention, control circuit 300 is to integrate to become a display system with display panel 308.The principle of operation of display system repeats no more at this with reference to Fig. 3 to Fig. 6.
Please with reference to Fig. 7, Fig. 7 is a kind of process flow diagram that produces the backlight drive method of current of another embodiment of the present invention explanation.The method of Fig. 7 is to utilize control circuit 300 explanations of Fig. 3, and detailed step is following:
Step 700: beginning;
Step 702: sequential control circuit 302 receives first pulse width light modulation signal PWMI and the image signal IS;
Step 704: sequential control circuit 302 is according to image signal IS, and changing the first pulse width light modulation signal PWMI is the second pulse width light modulation signal PWMO;
Step 706: backlight drive circuit 306 produces backlight drive current IS ET according to the second pulse width light modulation signal PWMO and the resistance 304 that is coupled to backlight drive circuit 306;
Step 708: backlight drive current IS ET drives the light-emitting diode (LED) backlight module 310 of display panel 308;
Step 710: finish.
Please with reference to Fig. 5; In step 704; When image signal IS is during for the 3D image signal; If it is 4mA (that is the work period of the first pulse width light modulation signal PWMI is 10%) that image signal IS (3D image signal) needs backlight drive current IS ET, then can to adjust the work period of the second pulse width light modulation signal PWMO be 10% to sequential control circuit 302.To need backlight drive current IS ET be 4mA but the present invention is not limited to image signal IS (3D image signal).Therefore, in step 706, backlight drive circuit 306 can produce the backlight drive current IS ET (4mA) corresponding to image signal IS (3D image signal) according to second pulse width light modulation signal PWMO (work period 10%) and the resistance 304.In step 704; When image signal IS is during for the 2D image signal; If it is 2mA (that is the work period of the first pulse width light modulation signal PWMI is 10%) that image signal IS (2D image signal) needs backlight drive current IS ET; Then can to adjust the work period of the second pulse width light modulation signal PWMO be 5% to sequential control circuit 302, that is corresponding to 10% (10% 50% be 5%) work period of image signal IS (2D image signal).To need backlight drive current IS ET be 2mA but the present invention is not limited to image signal IS (2D image signal).Therefore, in step 706, backlight drive circuit 306 can produce the backlight drive current IS ET (2mA) corresponding to image signal IS (2D image signal) according to second pulse width light modulation signal PWMO (work period 5%) and the resistance 304.
Please with reference to Fig. 8, Fig. 8 is a kind of process flow diagram that produces the backlight drive method of current of another embodiment of the present invention explanation.The method of Fig. 8 is to utilize control circuit 300 explanations of Fig. 3, and detailed step is following:
Step 800: beginning;
Step 802: sequential control circuit 302 receives first pulse width light modulation signal PWMI and the image signal IS;
Step 804:, carry out step 806 when image signal IS is during for the 2D image signal; When image signal IS is during for the 3D image signal, carry out step 812;
Step 806: sequential control circuit 302 is according to image signal IS, and changing the first pulse width light modulation signal PWMI is the second pulse width light modulation signal PWMO;
Step 808: backlight drive circuit 306 produces the first backlight drive current IS ET according to the second pulse width light modulation signal PWMO and the resistance 304 that is coupled to backlight drive circuit 306;
Step 810: the first backlight drive current IS ET drives the light-emitting diode (LED) backlight module 310 of display panel 308, rebound step 804;
Step 812: sequential control circuit 302 is according to image signal IS, and changing the first pulse width light modulation signal PWMI is the 3rd pulse width light modulation signal PWMO ';
Step 814: backlight drive circuit 306 is according to the 3rd pulse width light modulation signal PWMO ' and be coupled to the resistance 304 of backlight drive circuit 306, produces the second backlight drive current IS ET ';
Step 816: the second backlight drive current IS ET ' drives the light-emitting diode (LED) backlight module 310 of display panel 308, rebound step 804.
Please with reference to Fig. 6; In step 806; Because image signal IS be for the 2D image signal and corresponding to work period of the first pulse width light modulation signal PWMI of 2D image signal be to be 100%, so corresponding to the work period of the second pulse width light modulation signal PWMO of 2D image signal be to be 50%.In step 808, backlight drive circuit 306 is according to the second pulse width light modulation signal PWMO (work period is to be 50%) and be coupled to the resistance 304 of backlight drive circuit 306, produces the backlight drive current IS ET (20mA) corresponding to the 2D image signal.In step 812; Because image signal IS be for the 3D image signal and corresponding to work period of the first pulse width light modulation signal PWMI of 3D image signal be to be 100%, so corresponding to the work period of the 3rd pulse width light modulation signal PWMO ' of 3D image signal be to be 32%.That is since the opening time of shutter glasses or liquid crystal phase retardation film be the first pulse width light modulation signal PWMI work period 32%, so corresponding to the work period of the 3rd pulse width light modulation signal PWMO ' of 3D image signal be to be 32%.In step 814, backlight drive circuit 306 is according to the 3rd pulse width light modulation signal PWMO ' (work period is to be 32%) and be coupled to the resistance 304 of backlight drive circuit 306, produces the backlight drive current IS ET (12.2mA) corresponding to the 3D image signal.
In sum, the control circuit of generation backlight drive electric current provided by the present invention and its method are to utilize sequential control circuit according to different image signals, and changing the first pulse width light modulation signal is the second pulse width light modulation signal.Then, backlight drive circuit can produce corresponding backlight drive electric current according to the second pulse width light modulation signal.In addition, backlight drive circuit is according to the backlight drive electric current that the second pulse width light modulation signal of work period 100% is produced, and is to be the maximal value corresponding to the backlight drive electric current of 3D image signal.So, the present invention can promote the brightness of display panel when display panel shows the 3D image, and when showing the 2D image, keeps the normal brightness of display panel.Therefore, the present invention not only can improve display panel when showing the 3D image, and the shortcoming that display panel brightness is lower also can reduce the number and the layout cabling of passive component.
The above only is the present invention's preferred embodiment, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (13)
1. a control circuit that produces the backlight drive electric current is characterized in that, comprises:
One sequential control circuit; In order to receive one first a pulse width light modulation signal and an image signal; And according to this image signal; Changing this first pulse width light modulation signal is one second pulse width light modulation signal, and wherein the work period of this second pulse width light modulation signal becomes a ratio with the work period of this first pulse width light modulation signal;
One resistance; And
One backlight drive circuit is coupled to this sequential control circuit and this resistance, in order to receiving this second pulse width light modulation signal, and according to this second pulse width light modulation signal and this resistance, produces a backlight drive electric current.
2. control circuit according to claim 1 is characterized in that, wherein this image signal is to be a 2D image signal or a 3D image signal.
3. control circuit according to claim 1 is characterized in that, wherein this backlight drive electric current system is in order to drive a light-emitting diode (LED) backlight module of a display panel.
4. one kind produces the backlight drive method of current, it is characterized in that, comprises:
Receive one first a pulse width light modulation signal and an image signal;
According to this image signal, changing this first pulse width light modulation signal is one second pulse width light modulation signal; And
According to this second pulse width light modulation signal and a resistance that is coupled to a backlight drive circuit, produce one first backlight drive electric current.
5. method according to claim 4 is characterized in that other comprises:
One light-emitting diode (LED) backlight module of this first backlight drive current drives, one display panel.
6. method according to claim 4 is characterized in that, wherein this image signal is to be a 2D image signal.
7. method according to claim 6 is characterized in that, wherein according to the work period and the frequency of this 2D image signal, changing this first pulse width light modulation signal is this second pulse width light modulation signal.
8. according to the said method of claim 6, it is characterized in that other comprises:
Receive a 3D image signal;
According to this 3D image signal, changing this first pulse width light modulation signal is one the 3rd pulse width light modulation signal; And
According to the 3rd pulse width light modulation signal and this resistance, produce one second backlight drive electric current.
9. method according to claim 8 is characterized in that other comprises:
One light-emitting diode (LED) backlight module of this second backlight drive current drives, one display panel.
10. said according to Claim 8 method is characterized in that, wherein according to the work period and the frequency of this 3D image signal, changing this first pulse width light modulation signal is the 3rd pulse width light modulation signal.
11. method according to claim 4 is characterized in that, wherein this image signal is to be a 3D image signal.
12. method according to claim 11 is characterized in that, wherein according to the work period and the frequency of this 3D image signal, changing this first pulse width light modulation signal is this second pulse width light modulation signal.
13. a display system is characterized in that, comprises:
One display panel;
One sequential control circuit; In order to receive one first a pulse width light modulation signal and an image signal; And according to this image signal; Changing this first pulse width light modulation signal is one second pulse width light modulation signal, and wherein the work period of this second pulse width light modulation signal becomes a ratio with the work period of this first pulse width light modulation signal;
One resistance; And
One backlight drive circuit is coupled to this sequential control circuit and this resistance, in order to receiving this second pulse width light modulation signal, and according to this second pulse width light modulation signal and this resistance, produces a backlight drive electric current;
Wherein this backlight drive electric current is in order to drive a light-emitting diode (LED) backlight module of this display panel.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102930845A (en) * | 2012-11-15 | 2013-02-13 | 深圳市华星光电技术有限公司 | Liquid crystal display timing driver |
| CN103165085A (en) * | 2013-03-29 | 2013-06-19 | 深圳市华星光电技术有限公司 | Backlight drive circuit, driving method thereof and liquid crystal device |
| US8890423B2 (en) | 2013-03-29 | 2014-11-18 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Backlight driving circuit, LCD device, and method for driving backlight driving circuit |
| CN105304027A (en) * | 2015-10-12 | 2016-02-03 | 武汉华星光电技术有限公司 | Control circuit and control method of backlight and liquid crystal display device |
| CN105513542A (en) * | 2016-01-13 | 2016-04-20 | 昆山龙腾光电有限公司 | Backlight driving device and method for liquid crystal display device |
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| CN101944331A (en) * | 2010-09-15 | 2011-01-12 | 深圳创维－Rgb电子有限公司 | TV set and backlight control circuit thereof |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102930845A (en) * | 2012-11-15 | 2013-02-13 | 深圳市华星光电技术有限公司 | Liquid crystal display timing driver |
| CN102930845B (en) * | 2012-11-15 | 2015-06-03 | 深圳市华星光电技术有限公司 | Liquid crystal display timing driver |
| CN103165085A (en) * | 2013-03-29 | 2013-06-19 | 深圳市华星光电技术有限公司 | Backlight drive circuit, driving method thereof and liquid crystal device |
| US8890423B2 (en) | 2013-03-29 | 2014-11-18 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Backlight driving circuit, LCD device, and method for driving backlight driving circuit |
| CN103165085B (en) * | 2013-03-29 | 2016-06-29 | 深圳市华星光电技术有限公司 | A kind of backlight drive circuit and driving method thereof and liquid-crystal apparatus |
| CN105304027A (en) * | 2015-10-12 | 2016-02-03 | 武汉华星光电技术有限公司 | Control circuit and control method of backlight and liquid crystal display device |
| US9892690B2 (en) | 2015-10-12 | 2018-02-13 | Wuhan China Star Optoelectronics Technology Co., Ltd. | Control circuit for backlight, a control method and a liquid crystal display device |
| CN105513542A (en) * | 2016-01-13 | 2016-04-20 | 昆山龙腾光电有限公司 | Backlight driving device and method for liquid crystal display device |
| CN105513542B (en) * | 2016-01-13 | 2018-07-24 | 昆山龙腾光电有限公司 | A kind of backlight drive device and method of liquid crystal display device |
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Application publication date: 20120104 |