CN101441860A - Control device for starting LCD power supply - Google Patents
Control device for starting LCD power supply Download PDFInfo
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- CN101441860A CN101441860A CNA2008101882600A CN200810188260A CN101441860A CN 101441860 A CN101441860 A CN 101441860A CN A2008101882600 A CNA2008101882600 A CN A2008101882600A CN 200810188260 A CN200810188260 A CN 200810188260A CN 101441860 A CN101441860 A CN 101441860A
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Abstract
The invention particularly discloses a control device for starting an LED power supply. A power interface of an LED controller is connected with a logic power supply of an LED, and the output end of the power interface is connected with the first input end which makes a signal to generate a module and the control signal input end of the LED; the output end which makes a signal to generate a module is connected with an enabling pin of a backlight power supply chip; the output end of the backlight power supply chip is connected with a backlight power supply of the LED; after the LED controller is started, a control signal is output to an enabling signal generating module and the LED; and the enabling signal generating module receives the control signal of the LED controller, and outputs the enabling signal to the backlight power supply chip, so that the backlight power supply chip can light the backlight source of the LED. The control device is adopted to effectively guarantee the starting of the backlight power supply of the LED on the logical power supply after electricity switching, and ensure correct order starting of the logic power supply of the LED and the backlight power supply.
Description
Technical field
The present invention relates to the control field, particularly relate to a kind of control device of LCD power initiation.
Background technology
LCD (LCD:Liquid Crystal Display) is to place liquid crystal in the middle of two parallel glass, the tiny electric wire that many vertical and levels are arranged in the middle of two sheet glass, whether seeing through switches on controls shaft-like quartzy molecular changes direction, and light refraction is come out to produce picture.
LCD generally needs the power supply of two-way power supply, comprises logic power and backlight electric power.Because the life-span of LCD generally is limited by the life-span of backlight, and the power consumption overwhelming majority of LCD all consumes on backlight.Therefore frequently lighting when not required as if backlight, not only can influence the serviceable life of LCD integral body, and can increase the power consumption of LCD.For these reasons, be to guarantee the serviceable life of LCD and reduce power consumption that general producer is all recommended or when requiring LCD powered, logic power should be prior to backlight electric power, be and require lcd controller at first to start.
With reference to Fig. 1, be the control device of prior art LCD power initiation.
Control device shown in Figure 1 comprises: the backlight electric power chip 1c of cpu controller 1a, lcd controller 1b and band enable pin.
The output port of cpu controller 1a connects the enable pin of backlight electric power chip 1c.The backlight electric power of the output termination LCD 1d of backlight electric power chip 1c.Lcd controller 1b connects the signal input end of LCD 1d.
When powering on for LCD 1d, forbid backlight electric power chip 1c by cpu controller 1a earlier, wait the logic power of LCD1d to power on to finish with lcd controller 1b start finish after, the enables backlight power supply chip is lighted backlight again.
But, adopt the described control device of prior art, the order enables backlight power supply of carrying out according to the internal processes of cpu controller 1a, because cpu controller 1a can't obtain the status information of logic power and the lcd controller 1b of LCD 1d, therefore can't be clear and definite during backlight lightening, whether whether the logic power of LCD 1d power on to finish to start with lcd controller 1b and finish, and can't guarantee that therefore the logic power of LCD 1d and backlight electric power are by correct sequence starting.
Simultaneously, enable level when not meeting as the default conditions of the output port of cpu controller 1a and backlight electric power chip 1c, in the moment of powering on for LCD 1d, the output port meeting moment output enable signal enables backlight power supply chip 1c that cpu controller 1a links to each other with the enable pin of backlight electric power chip 1c, thus light the backlight of LCD 1d.The internal processes of cpu controller 1a such as have only to move, after the described output port of cpu controller 1a is configured, just can forbid backlight electric power chip 1c, extinguish backlight.
Summary of the invention
Technical matters to be solved by this invention provides a kind of control device of LCD power initiation, and the logic power of assurance LCD and backlight electric power are by correct sequence starting.
For solving the problems of the technologies described above, the invention provides a kind of control device of LCD power initiation, described device is used to control the LCD backlight electric power and starts; Described device comprises: lcd controller, enable signal generation module, backlight electric power chip;
The power interface of described lcd controller connects the logic power of LCD, the first input end of its output termination enable signal generation module and the signal input end of LCD; The enable pin of the output termination backlight electric power chip of described enable signal generation module; The backlight electric power of the output termination LCD of described backlight electric power chip;
Described lcd controller outputs control signals to described enable signal generation module and described LCD after starting; Described enable signal generation module receives the control signal of described lcd controller, outputs enable signal to described backlight electric power chip, enables described backlight electric power chip, lights the backlight electric power of described LCD.
Preferably, described device further comprises: cpu controller; Second input end of an output termination enable signal generation module of described cpu controller.
Preferably, the 3rd input end of the described enable signal generation module of output termination of described enable signal generation module constitutes backfeed loop.
Preferably, described enable signal generation module comprises: Schmidt trigger, full sized pules sequencer, impulse meter, not gate and second resistance;
The output terminal of the described lcd controller of input termination of described Schmidt trigger, the zero clearing reset terminal of the described impulse meter of its output termination; The input end of the described impulse meter of output termination of described full sized pules sequencer; The described not gate of carry output termination of described impulse meter; The described backlight electric power chip of the output termination of described not gate;
Described second resistance is connected between the output terminal and VCC of described Schmidt trigger.
Preferably, described device further comprises pull down resistor; Described pull down resistor is connected between the enable pin and ground of backlight electric power chip.
The present invention also provides a kind of control device of LCD power initiation, and described device is used to control the LCD backlight electric power and starts; Described device comprises: lcd controller, controller power source, enable signal generation module and backlight electric power chip;
The power interface of described lcd controller connects controller power source, the first input end of its output termination enable signal generation module and the signal input end of LCD; The logic power of described LCD connects second input end of described enable signal generation module; The enable pin of the output termination backlight electric power chip of described enable signal generation module; The backlight electric power of the output termination LCD of described backlight electric power chip;
Described lcd controller outputs control signals to described enable signal generation module and described LCD after starting; After the logic power of described LCD powers on and finishes, send high level signal to described enable signal generation module;
Described enable signal generation module, receive the high level signal of logic power of the control signal of described lcd controller and LCD simultaneously after, output enable signal to described backlight electric power chip, enable described backlight electric power chip, light the backlight electric power of described LCD.
Preferably, described device further comprises: cpu controller; The 3rd input end of an output termination enable signal generation module of described cpu controller.
Preferably, the four-input terminal of the described enable signal generation module of output termination of described enable signal generation module constitutes backfeed loop.
Preferably, described enable signal generation module comprises: Schmidt trigger, full sized pules sequencer, impulse meter, not gate, logic power sampling unit, with the door and second resistance;
The output terminal of the described lcd controller of input termination of described Schmidt trigger, the zero clearing reset terminal of the described impulse meter of its output termination; The input end of the described impulse meter of output termination of described full sized pules sequencer; The described not gate of carry output termination of described impulse meter; The output termination of described not gate described with the door first input end;
The logic power of the described LCD of input termination of described logic power sampling unit, its output termination described with the door second input end;
Described with the door the described backlight electric power chip of output termination;
Described second resistance is connected between the output terminal and high level of described Schmidt trigger.
Preferably, described device further comprises pull down resistor; Described pull down resistor is connected between the enable pin and ground of backlight electric power chip.
Compared with prior art, the present invention has the following advantages:
The control device of first kind of LCD power initiation provided by the invention, the logic power by LCD are the lcd controller power supply, after having only logic power as LCD to power on to finish, just can start lcd controller, output control signals to the enable signal generation module.After described enable signal generation module receives the control signal of lcd controller transmission, output enable signal to the enable pin of backlight electric power chip, enable described backlight electric power chip, light the backlight electric power of LCD.Adopt described control device, the backlight electric power that has effectively guaranteed LCD the logic power of LCD power on finish start with lcd controller after startup, guaranteed that the logic power of LCD and backlight electric power are by correct sequence starting.
The control device of second kind of LCD power initiation provided by the invention is the lcd controller power supply by controller power source, after lcd controller starts, outputs control signals to the enable signal generation module; Simultaneously, the logic power of LCD is connect the enable signal generation module, when the logic power of LCD power on finish after, the output high level is to the enable signal generation module.Described enable signal generation module, after having only the high level signal of logic power of the control signal that receives described lcd controller simultaneously and LCD, just output enable signal to the enable pin of backlight electric power chip, enable described backlight electric power chip, light the backlight electric power of LCD.Adopt described control device, the backlight electric power that has effectively guaranteed LCD the logic power of LCD power on finish start with lcd controller after startup, guaranteed that the logic power of LCD and backlight electric power are by correct sequence starting.
Simultaneously, two kinds of control device provided by the invention all further comprise: be connected on the enable pin of backlight electric power chip and the pull down resistor between the ground.Can eliminate LCD when start by described pull down resistor, lcd controller output port moment output enable signal enables backlight power supply chip is avoided the backlight electric power instant igniting of LCD.Thus, improve the life-span of LCD backlight, reduced the use power consumption of LCD.
Description of drawings
Fig. 1 is the control device of prior art LCD power initiation;
Fig. 2 is the described LCD power initiation of a first embodiment of the invention control device structural drawing;
Fig. 3 is the described LCD power initiation of a second embodiment of the invention control device structural drawing;
Fig. 4 is the described LCD power initiation of a third embodiment of the invention control device structural drawing;
Fig. 5 is the enable signal generation module first embodiment circuit diagram of the present invention;
Fig. 6 is the described LCD power initiation of a fourth embodiment of the invention control device structural drawing;
Fig. 7 is the described LCD power initiation of a fifth embodiment of the invention control device structural drawing;
Fig. 8 is the enable signal generation module second embodiment circuit diagram of the present invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
The control device of first kind of LCD power initiation provided by the invention, the logic power by LCD are the lcd controller power supply, after having only logic power as LCD to power on to finish, just can start lcd controller, output control signals to the enable signal generation module.After described enable signal generation module receives the control signal of lcd controller transmission, output enable signal to the enable pin of backlight electric power chip, enable described backlight electric power chip, light the backlight electric power of LCD.
With reference to Fig. 2, be the described LCD power initiation of first embodiment of the invention control device structural drawing.
Described control device comprises: lcd controller 1, enable signal generation module 2, pull down resistor R0 3, backlight electric power chip 4.
The power interface of lcd controller 1 connects the logic power of LCD 5.The output port of lcd controller 1 connects the first input end of enable signal generation module 2 and the signal input end of LCD 5.The enable pin of the output termination backlight electric power chip 4 of enable signal generation module 2.The backlight electric power of the output termination LCD 5 of backlight electric power chip 4.Pull down resistor R0 3 is connected between the enable pin and ground of backlight electric power chip 4.
When LCD 5 starts power on, start lcd controller 1 by logic power.Lcd controller 1 outputs control signals to enable signal generation module 2.
After enable signal generation module 2 receives the control signal of lcd controller 1 output, send enable signal to backlight electric power chip 4.
Backlight electric power chip 4 receives and enables enable signal, is enabled, and lights the backlight electric power of LCD 5.
Pull down resistor R0 3 is used to guarantee forbid backlight electric power chip 4 in the moment that LCD 5 starts power on.
Adopt the described control device of prior art, LCD exists an instantaneous flicker and impact, increases the power attenuation of LCD, the serviceable life of having reduced LCD.Control device of the present invention can be eliminated flicker or the impact that start the time may cause by pull down resistor R0 3, in the life-span of having improved the LCD backlight, has reduced the use power consumption of LCD.
Preferably, the control signal of lcd controller 1 output can be the synchronizing signal of row, field, the clock CLK signal of LCD, and the color data signal etc.
Power on when LCD 5 starts shooting, logic power powers on and finishes, and starts lcd controller 1, makes lcd controller 1 output control signal, and control enable signal generation module 2 produces enable signals, and enables backlight power supply chip 4 is lighted backlight electric power.
Do not finish or close and/or lcd controller 1 does not start or when closing, enable signal generation module 2 is forbidden backlight electric power chip 4, extinguishes backlight electric power when logic power powers on.
Adopt the embodiment of the invention one described control device, the startup power supply of lcd controller 1 is provided by the logic power of LCD 5, has only the logic power of LCD 5 to power on and finishes, and lcd controller 1 is started, thereby trigger enable signal generation module 2 and produce enable signal, light backlight electric power.Thus, the backlight electric power that has effectively guaranteed LCD 5 logic power power on finish start with lcd controller 1 after startup.
Adopt control device of the present invention, help to realize earlier LCD 5 to be shown initialization, light again backlight, thereby can be so that LCD 5 picture can occur once lighting, the white screen phenomenon when avoiding starting shooting has improved the customer satisfaction of product.
Simultaneously, control device of the present invention can also adopt cpu controller in conjunction with traditional controlling schemes, realizes the dual control of the hardware and software of backlight electric power.The embodiment of the invention two is with the difference of embodiment one, comprises cpu controller.
With reference to Fig. 3, be the described LCD power initiation of second embodiment of the invention control device structural drawing.
Embodiment two is with the difference of embodiment one: described control device further comprises: cpu controller 7.
The power interface of lcd controller 1 connects the logic power of LCD 5.The output port of lcd controller 1 connects the first input end of enable signal generation module 2 and the signal input end of LCD 5.An output port of cpu controller 7 connects second input end of enable signal generation module 2.The enable pin of the output termination backlight electric power chip 4 of enable signal generation module 2.The backlight electric power of the output termination LCD 5 of backlight electric power chip 4.Pull down resistor R0 3 is connected between the enable pin and ground of backlight electric power chip 4.
When LCD 5 starts power on, start lcd controller 1 by logic power.Lcd controller 1 output first controls signal to enable signal generation module 2.
Enable signal generation module 2 sends enable signal to backlight electric power chip 4 after receiving first control signal and cpu controller 7 outputs second control signal of lcd controller 1 output simultaneously.
Backlight electric power chip 4 receives enable signal, is enabled, and lights the backlight electric power of LCD 5.
Pull down resistor R0 3 is used to guarantee forbid backlight electric power chip 4 in the moment that LCD 5 starts power on.
In the embodiment of the invention two described control device, after enable signal generation module 2 has only second control signal of first control signal that receives lcd controller 1 output simultaneously and cpu controller 7 outputs, ability output enable signal, be and have only after cpu controller 7 and lcd controller 1 all start, just can produce enable signal, enables backlight power supply chip 4 is lighted backlight electric power.And the startup power supply of lcd controller 1 is that the logic power by LCD 5 provides, and has only the logic power of LCD 5 to power on and finishes, and lcd controller 1 is started.Thus, effectively guaranteed backlight electric power logic power power on finish start with lcd controller after startup.
When cpu controller 7 does not start or closes and/or logic power powers on and do not finish or close and/or lcd controller 1 does not start or when closing, enable signal generation module 2 is forbidden backlight electric power chip 4, extinguishes backlight electric power.
Control device of the present invention can also constitute the backlight electric power with constant time lag function according to the state of current enable signal and start or shut-off circuit, and that avoids the LCD backlight electric power instantaneously lights or extinguish.
Referring to Fig. 4, be the described LCD power initiation of third embodiment of the invention control device structural drawing.
Described control device comprises: lcd controller 1, enable signal generation module 2, pull down resistor R0 3, backlight electric power chip 4.
Embodiment three is with the difference of embodiment one: the 3rd input end of the output termination enable signal generation module 2 of enable signal generation module 2 constitutes backfeed loop.
When LCD 5 starts power on, start lcd controller 1 by logic power.Lcd controller 1 outputs control signals to enable signal generation module 2.
Enable signal generation module 2 receive the control signal of lcd controller 1 output and the enable signal that self feeds back to after, send enable signal to backlight electric power chip 4.
Backlight electric power chip 4 receives enable signal, is enabled, and lights LCD 5.
Pull down resistor R0 3 is used to guarantee forbid backlight electric power chip 4 in the moment that LCD 5 starts power on.
The embodiment of the invention three described control device, when enable signal generation module 2 determine logic powers power on finish start with lcd controller after, judge further whether the feedback signal that backfeed loop returns effective.If feedback signal is effective, continue the output enable signal, continue to light backlight electric power.When feedback signal is invalid, after enable signal generation module 2 postponed a period of times, the output enable signal was lighted backlight electric power again.
Do not finish or close and/or lcd controller 1 does not start or when closing when logic power powers on, enable signal generation module 2 judges whether the feedback signal that backfeed loop returns is effective.If feedback signal is invalid, continue to forbid backlight electric power chip 4, close backlight electric power.When feedback signal is effective, after enable signal generation module 2 postpones a period of time, forbid backlight electric power chip 4, close backlight electric power.
Thus, the unlatching and the shutoff of the fixed delay of backlight electric power have been realized.
With reference to Fig. 5, be the enable signal generation module first embodiment circuit diagram of the present invention.
Circuit diagram shown in Figure 5 is that example describes with embodiment one described control device.
The logic power of supposing LCD 5 is 3.3V.Lcd controller 1 output CLK clock signal.When enable signal generation module 2 receives lcd controller 1 output CLK clock signal, produce enable signal.
The enable signal generation module comprises: Schmidt trigger 21, full sized pules sequencer 22, impulse meter 23, not gate 24 and resistance R 1 25.
The output terminal of the input termination lcd controller 1 of Schmidt trigger 21, the zero clearing reset terminal RD of its output termination impulse meter 23.The input end CP of the output termination impulse meter 23 of full sized pules sequencer 22.The carry output terminal C of impulse meter 23 connects not gate 24.The output termination backlight electric power chip 4 of not gate 24.Resistance R 1 25 is connected between the output terminal and VCC of Schmidt trigger 21.
Described VCC is the power supply input pin of Schmidt trigger 21.General quenching pulse is that low level is effective, by on draw the reset signal that can avoid wrong, strengthen anti-jamming capacity.
When LCD 5 starts power on, start lcd controller 1 by logic power.Lcd controller 1 output CLK clock signal is as control signal.The CLK clock signal is the triangular signal of class sine.Described CLK clock signal is output as the zero clearing reset terminal RD of the pulse signal of high-low level to impulse meter 23 through Schmidt trigger 21 shapings.
Full sized pules sequencer 22 output pulse sequences are to the input end CP of impulse meter 23.23 pairs of described pulse trains of impulse meter are counted.
When the zero clearing reset terminal RD of impulse meter 23 had the pulse input, impulse meter 23 count value zero clearings also restarted counting, and the carry output terminal C of impulse meter 23 output simultaneously is low always.
The low level of impulse meter 23 output exports backlight electric power chip 4 to after not gate 24 becomes height, enables backlight power supply chip 4 is lighted the backlight electric power of LCD 5.
The startup power supply of lcd controller 1 is provided by the logic power of LCD 5, has only the logic power of LCD 5 to start, and lcd controller 1 is started, and produces enable signal thereby trigger enable signal generation module 2, lights backlight electric power.Guaranteed to have only the logic power of LCD 5 to power on and finish thus, just can light backlight electric power, realized that the backlight electric power of LCD 5 starts after logic power.
When the zero clearing reset terminal RD of impulse meter 23 did not have the pulse input within a certain period of time, the carry output terminal C of impulse meter 23 was effective, is output as high level.The high level of impulse meter 23 output through not gate 24 become low after, export backlight electric power chip 4 to, forbid backlight electric power chip 4, forbid the backlight electric power of LCD 5.
Thus, only realized lcd controller 1 start and the logic power of LCD 5 power on finish after, just can light backlight electric power.
In other embodiments of the invention, described enable signal generation module 2 also can adopt other circuit ways of realization.
The present invention also provides a kind of LCD power initiation control device.
The control device of second kind of LCD power initiation provided by the invention is the lcd controller power supply by controller power source, after lcd controller starts, outputs control signals to the enable signal generation module; Simultaneously, the logic power of LCD is connect the enable signal generation module, when the logic power of LCD power on finish after, the output high level is to the enable signal generation module.Described enable signal generation module, after having only the high level signal of logic power of the control signal that receives described lcd controller simultaneously and LCD, just output enable signal to the enable pin of backlight electric power chip, enable described backlight electric power chip, light the backlight electric power of LCD.Adopt described control device, the backlight electric power that has effectively guaranteed LCD the logic power of LCD power on finish start with lcd controller after startup, guaranteed that the logic power of LCD and backlight electric power are by correct sequence starting.
First kind of control device of the present invention, the startup power supply of lcd controller 1 is provided by the logic power of LCD 5, and the difference of second kind of control device of the present invention and first kind is, and the power supply by independent setting is the lcd controller power supply.
With reference to Fig. 6, be the described LCD power initiation of fourth embodiment of the invention control device structural drawing.
Described control device comprises: lcd controller 1, enable signal generation module 2, pull down resistor R03, backlight electric power chip 4 and controller power source 6.
The power interface of lcd controller 1 connects controller power source 6.The output terminal of lcd controller 1 connects the first input end of enable signal generation module 2 and the signal input end of LCD 5.The logic power of LCD 5 connects second input end of enable signal generation module 2.The enable pin of the output termination backlight electric power chip 4 of enable signal generation module 2.The backlight electric power of the output termination LCD 5 of backlight electric power chip 4.Pull down resistor R0 3 is connected between the enable pin and ground of backlight electric power chip 4.
When LCD 5 starts powered on, logic power output high level signal was to enable signal generation module 2.
Opening controller power supply 6 for lcd controller 1 power supply, starts lcd controller 1, outputs control signals to enable signal generation module 2.
Enable signal generation module 2 sends enable signal to backlight electric power chip 4 after receiving the control signal and logic power output high level signal of lcd controller 1 output simultaneously.
Backlight electric power chip 4 receives and enables enable signal, is enabled, and lights the backlight electric power of LCD 5.
Pull down resistor R0 3 is used to guarantee forbid backlight electric power chip 4 in the moment that LCD 5 starts power on.
In the embodiment of the invention four described control device, after enable signal generation module 2 has only the control signal and logic power output high level signal that receives lcd controller 1 output simultaneously, ability output enable signal, be have only lcd controller 1 to start and the logic power of LCD 5 power on finish after, just can produce enable signal, enables backlight power supply chip 4 is lighted backlight electric power, effectively guaranteed backlight electric power logic power power on finish start with lcd controller 1 after startup.
When lcd controller 1 does not start or closes and/or logic power does not start or when closing, enable signal generation module 2 is forbidden backlight electric power chip 4, extinguishes backlight electric power.
Simultaneously, control device of the present invention also can adopt cpu controller in conjunction with traditional controlling schemes, realizes the dual control of the hardware and software of backlight electric power.The embodiment of the invention five is with the difference of embodiment four, comprises cpu controller.
Referring to Fig. 7, be the described LCD power initiation of fifth embodiment of the invention control device structural drawing.
Embodiment five is with the difference of embodiment four: described control device further comprises cpu controller 7.
The power interface of lcd controller 1 connects controller power source 6.The output terminal of lcd controller 1 connects the first input end of enable signal generation module 2 and the signal input end of LCD 5.The logic power of LCD 5 connects second input end of enable signal generation module 2.An output port of cpu controller 7 connects the 3rd input end of enable signal generation module 2.The enable pin of the output termination backlight electric power chip 4 of enable signal generation module 2.The backlight electric power of the output termination LCD 5 of backlight electric power chip 4.Pull down resistor R03 is connected between the enable pin and ground of backlight electric power chip 4.
Opening controller power supply 6 for lcd controller 1 power supply, starts lcd controller 1, and output first controls signal to enable signal generation module 2.
When LCD 5 starts powered on, logic power output high level signal was to enable signal generation module 2.
Enable signal generation module 2 sends enable signal to backlight electric power chip 4 after receiving the high level signal of first control signal, cpu controller 7 output second control signals and logic power output of lcd controller 1 output simultaneously.
Backlight electric power chip 4 receives and enables enable signal, is enabled, and lights the backlight electric power of LCD 5.
Pull down resistor R0 3 is used to guarantee forbid backlight electric power chip 4 in the moment that LCD 5 starts power on.
In the embodiment of the invention five described control device, after enable signal generation module 2 has only the high level signal of first control signal, cpu controller 7 output second control signals and the logic power output that receive lcd controller 1 output simultaneously, ability output enable signal, be have only that cpu controller 7 starts, lcd controller 1 starts and logic power powers on and finish after, just can produce enable signal, enables backlight power supply chip 4 is lighted backlight electric power.Thus, effectively guaranteed backlight electric power logic power power on finish start with lcd controller 1 after startup.
When cpu controller 7 does not start or closes and/or lcd controller 1 does not start or closes and logic power does not start or when closing, enable signal generation module 2 is forbidden backlight electric power chip 4, extinguishes backlight electric power.
Preferably, the embodiment of the invention four described devices also can constitute backfeed loop with the four-input terminal of the output termination enable signal generation module 2 of enable signal generation module 2.
With reference to Fig. 8, be the enable signal generation module second embodiment circuit diagram of the present invention.
Circuit diagram shown in Figure 8 is that example describes with embodiment four described control device.
The logic power of supposing LCD 5 is 3.3V.Lcd controller 1 output CLK clock signal.When enable signal generation module 2 receives the 3.3V high level of logic power output of LCD 5 and lcd controller 1 output CLK clock signal simultaneously, produce enable signal.
The enable signal generation module comprises: Schmidt trigger 21, full sized pules sequencer 22, impulse meter 23, not gate 24, resistance R 1 25, logic power sampling unit 26 and with door 27.
The output terminal of the input termination lcd controller 1 of Schmidt trigger 21, the zero clearing reset terminal RD of its output termination impulse meter 23.The input end CP of the output termination impulse meter 23 of full sized pules sequencer 22.The carry output terminal C of impulse meter 23 connects not gate 24.The first input end of the output termination of not gate 24 and door 27.
The logic power of the input termination LCD 5 of logic power sampling unit 26, second input end of its output termination and door 27.
Output termination backlight electric power chip 4 with door 27.
Full sized pules sequencer 22 output pulse sequences are to the input end CP of impulse meter 23.23 pairs of described pulse trains of impulse meter are counted.
When the zero clearing reset terminal RD of impulse meter 23 had the pulse input, impulse meter 23 count value zero clearings also restarted counting, and the carry output terminal C of impulse meter 23 output simultaneously is low always.
The low level of impulse meter 23 outputs exports to and door 27 after not gate 24 becomes height.
When the logic power of LCD 5 starts, logic power sampling unit 26 output high level to door 27.
When receiving the high level of the high level of not gate 24 output and 26 outputs of logic power sampling unit simultaneously with door 27, with the high effectively enable signal of door 27 outputs to backlight electric power chip 4, enables backlight power supply chip 4 is lighted the backlight electric power of LCD 5.
When the logic power of LCD 5 does not start or has closed, logic power sampling unit 26 output low levels to door 27.Make with door 27 output low levels to backlight electric power chip 4, forbid backlight electric power chip 4, do not light or extinguish backlight electric power.Guaranteed thus, even lcd controller 1 has started, if but the logic power of LCD 5 does not also start or closes, and the backlight electric power of LCD 5 still can not lighted, and has realized that the backlight electric power of LCD 5 starts after logic power.
When the zero clearing reset terminal RD of impulse meter 23 did not have the pulse input within a certain period of time, the carry output terminal C of impulse meter 23 was effective, is output as high level.The high level of impulse meter 23 output through not gate 24 become low after, export to and door 27.
At this moment, no matter logic power sampling unit 26 from the logic power sampling output of LCD 5 be high level or low level, with door 27 equal output low levels to backlight electric power chip 4, forbid backlight electric power chip 4, forbid the backlight electric power of LCD 5.
Guaranteed thus, finished even the logic power of LCD 5 has powered on, if but lcd controller 1 does not start yet or closes, and the backlight electric power of LCD 5 still can not be lighted, and has realized that the backlight electric power of LCD 5 is lighted after lcd controller 1 starts.
Thus, only realized lcd controller 1 start and the logic power of LCD 5 power on finish after, just can light backlight electric power.
In other embodiments of the invention, described enable signal generation module 2 also can adopt other circuit ways of realization.
More than to the control device of LCD power initiation provided by the present invention, be described in detail, used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1, a kind of control device of LCD power initiation is characterized in that, described device is used to control the LCD backlight electric power and starts; Described device comprises: lcd controller, enable signal generation module, backlight electric power chip;
The power interface of described lcd controller connects the logic power of LCD, the first input end of its output termination enable signal generation module and the signal input end of LCD; The enable pin of the output termination backlight electric power chip of described enable signal generation module; The backlight electric power of the output termination LCD of described backlight electric power chip;
Described lcd controller outputs control signals to described enable signal generation module and described LCD after starting; Described enable signal generation module receives the control signal of described lcd controller, outputs enable signal to described backlight electric power chip, enables described backlight electric power chip, lights the backlight electric power of described LCD.
2, device according to claim 1 is characterized in that, described device further comprises: cpu controller; Second input end of an output termination enable signal generation module of described cpu controller.
3, device according to claim 1 is characterized in that, the 3rd input end of the described enable signal generation module of output termination of described enable signal generation module constitutes backfeed loop.
4, device according to claim 1 is characterized in that, described enable signal generation module comprises: Schmidt trigger, full sized pules sequencer, impulse meter, not gate and second resistance;
The output terminal of the described lcd controller of input termination of described Schmidt trigger, the zero clearing reset terminal of the described impulse meter of its output termination; The input end of the described impulse meter of output termination of described full sized pules sequencer; The described not gate of carry output termination of described impulse meter; The described backlight electric power chip of the output termination of described not gate;
Described second resistance is connected between the output terminal and VCC of described Schmidt trigger.
5, according to each described device of claim 1 to 4, it is characterized in that described device further comprises pull down resistor; Described pull down resistor is connected between the enable pin and ground of backlight electric power chip.
6, a kind of control device of LCD power initiation is characterized in that, described device is used to control the LCD backlight electric power and starts; Described device comprises: lcd controller, controller power source, enable signal generation module and backlight electric power chip;
The power interface of described lcd controller connects controller power source, the first input end of its output termination enable signal generation module and the signal input end of LCD; The logic power of described LCD connects second input end of described enable signal generation module; The enable pin of the output termination backlight electric power chip of described enable signal generation module; The backlight electric power of the output termination LCD of described backlight electric power chip;
Described lcd controller outputs control signals to described enable signal generation module and described LCD after starting; After the logic power of described LCD powers on and finishes, send high level signal to described enable signal generation module;
Described enable signal generation module, receive the high level signal of logic power of the control signal of described lcd controller and LCD simultaneously after, output enable signal to described backlight electric power chip, enable described backlight electric power chip, light the backlight electric power of described LCD.
7, device according to claim 6 is characterized in that, described device further comprises: cpu controller; The 3rd input end of an output termination enable signal generation module of described cpu controller.
8, device according to claim 6 is characterized in that, the four-input terminal of the described enable signal generation module of output termination of described enable signal generation module constitutes backfeed loop.
9, device according to claim 6 is characterized in that, described enable signal generation module comprises: Schmidt trigger, full sized pules sequencer, impulse meter, not gate, logic power sampling unit, with the door and second resistance;
The output terminal of the described lcd controller of input termination of described Schmidt trigger, the zero clearing reset terminal of the described impulse meter of its output termination; The input end of the described impulse meter of output termination of described full sized pules sequencer; The described not gate of carry output termination of described impulse meter; The output termination of described not gate described with the door first input end;
The logic power of the described LCD of input termination of described logic power sampling unit, its output termination described with the door second input end;
Described with the door the described backlight electric power chip of output termination;
Described second resistance is connected between the output terminal and high level of described Schmidt trigger.
10, according to each described device of claim 6 to 9, it is characterized in that described device further comprises pull down resistor; Described pull down resistor is connected between the enable pin and ground of backlight electric power chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101882600A CN101441860B (en) | 2008-12-22 | 2008-12-22 | Control device for starting LCD power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101882600A CN101441860B (en) | 2008-12-22 | 2008-12-22 | Control device for starting LCD power supply |
Publications (2)
| Publication Number | Publication Date |
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| CN101441860A true CN101441860A (en) | 2009-05-27 |
| CN101441860B CN101441860B (en) | 2010-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101882600A Expired - Fee Related CN101441860B (en) | 2008-12-22 | 2008-12-22 | Control device for starting LCD power supply |
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| Country | Link |
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| CN (1) | CN101441860B (en) |
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| CN102722225A (en) * | 2012-06-16 | 2012-10-10 | 哈尔滨物格电子技术有限公司 | LCD (liquid crystal display) screen protective device of embedded system |
| CN105979179A (en) * | 2016-04-25 | 2016-09-28 | 乐视控股（北京）有限公司 | Clock signal processing circuit and clock signal processing method |
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| CN111243532A (en) * | 2020-01-16 | 2020-06-05 | 聚好看科技股份有限公司 | Backlight control method and display device |
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- 2008-12-22 CN CN2008101882600A patent/CN101441860B/en not_active Expired - Fee Related
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| CN108182920A (en) * | 2018-01-03 | 2018-06-19 | 惠科股份有限公司 | Liquid crystal display device and driving method thereof |
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| CN111243532A (en) * | 2020-01-16 | 2020-06-05 | 聚好看科技股份有限公司 | Backlight control method and display device |
| CN111277255A (en) * | 2020-03-20 | 2020-06-12 | Tcl华星光电技术有限公司 | Time sequence control system and display panel |
| CN113450727A (en) * | 2021-06-25 | 2021-09-28 | 京东方科技集团股份有限公司 | Driving circuit and driving method of display device |
| CN114120927A (en) * | 2021-12-06 | 2022-03-01 | Tcl华星光电技术有限公司 | Backlight module and display device |
| US11996057B2 (en) | 2021-12-06 | 2024-05-28 | Tcl China Star Optoelectronics Technology Co., Ltd. | Backlight module and display device |
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