CN102054462B - Low power consumption display control method and relevant display controller - Google Patents
Low power consumption display control method and relevant display controller Download PDFInfo
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- CN102054462B CN102054462B CN 200910208350 CN200910208350A CN102054462B CN 102054462 B CN102054462 B CN 102054462B CN 200910208350 CN200910208350 CN 200910208350 CN 200910208350 A CN200910208350 A CN 200910208350A CN 102054462 B CN102054462 B CN 102054462B
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Abstract
The invention discloses a low power consumption display control method and a relevant display controller. The low power consumption display control method is used for a display controller and comprises the following steps: detecting a sensing signal to generate a sensing result; generating a control signal according to the sensing result to control a power supply change-over controller to perform a low power consuming electric-saving mode; carrying out deassertion on the control signal and forbidden energy of a related power consuming circuit in a display controller when an awakening event appears; and finally arousing the display control to recover to the normal operating mode.
Description
Technical field
The present invention is relevant for display control method and relevant display controller, particularly relevant for a kind of low power consumption display control method and relevant display controller.
Background technology
Fig. 1 shows display circuit square Figure 100 of the display interior of prior art, comprise power circuit 110, scale controller 120 and backlight assembly 130, power circuit 110 converts appropriate voltage 114,116 to by AC power 112 power supplies, gives the running of backlight assembly 130 and scale controller 120 and power respectively.Display circuit square Figure 100 can be applied in the middle of computer monitor (monitor), simulated television or the Digital Television.In the world trends of carbon reduction, many manufacturers all are devoted to the saving of the power consumption of display under holding state, and prior art utilizes the power circuit 110 of ac/dc conversion (AC/DC convers ion) to carry out power saving.
Therefore very ardent needs development display controller and the correlation technique that a cover can the low-cost low power consumption that realizes.
Summary of the invention
The purpose of this invention is to provide a kind of display controller and correlation technique that can the low-cost low power consumption that realizes.
The present invention proposes a kind of display controller, comprises voltage detecting circuit, low power consumption control circuit, Power Management Unit, selector switch, microcontroller and crystal output/input circuit; Voltage detecting circuit detects the voltage level of a sensing signal; The low power consumption control circuit is coupled to voltage detecting circuit, and in order to produce first control signal according to this voltage level, voltage detecting circuit can be analog-digital converter or comparer; Power Management Unit is in order to receive wake events and in order to produce second control signal with in response to wake events; Selector switch is coupled to low power consumption control circuit and Power Management Unit, in order to export first control signal and second control signal alternatively, to control the running that a switch controller of power supply carries out battery saving mode or the normal manipulation mode of low power consumption, selector switch can be multiplexer.When selector switch is exported second control signal, Power Management Unit forbidden energy low power consumption control circuit, microcontroller, crystal output/input circuit and digital video interface (DVI (Digital Visual Interface))/high-definition multimedia audio/video interface (HDMI (High-Definition Multimedia Interface)) clock pulse amplifier is to reduce possible power consumption.
The present invention also proposes a kind of low power consumption display control method, be used for a display controller, comprise: detect a sensing signal to produce sensing result, for example, utilize analog digital to change this sensing signal to produce sensing result, perhaps, by comparing sensing signal and a predetermined voltage level to produce sensing result; Produce a control signal according to sensing result, for example, utilize universal input and output pin position to produce control signal, to control the battery saving mode running that a switch controller of power supply carries out low power consumption; When appearance one wake events, the circuit of relevant power consumption in invalid control signal and the forbidden energy display controller, for example, forbidden energy microcontroller, crystal output/input circuit and DVI/HDMI clock pulse amplifier; At last, wake display controller up and turn back to normal manipulation mode.
Description of drawings
In order to enable further to understand feature of the present invention and technology contents, see also following about detailed description of the present invention and accompanying drawing, yet accompanying drawing only provide with reference to and explanation, the present invention is limited, wherein:
Fig. 1 shows the display circuit calcspar of the display interior of prior art.
Fig. 2 shows the very-low power consumption display control circuit according to the specific embodiment of the invention.
Fig. 3 shows the main oscillogram that is relevant to Fig. 2 embodiment.
Fig. 4 shows the very-low power consumption display control circuit of another specific embodiment according to the present invention.
Fig. 5 shows the very-low power consumption display control circuit of another specific embodiment according to the present invention.
Fig. 6 shows the very-low power consumption display control circuit of another specific embodiment according to the present invention.
Fig. 7 shows the process flow diagram of very-low power consumption display control method according to a particular embodiment of the invention.
Fig. 8 shows the very-low power consumption switch controller of power supply according to a specific embodiment of the present invention.
Fig. 9 shows the main signal waveforms of very-low power consumption power supply conversion and control running among Fig. 8.
Figure 10 shows the power conversion method process flow diagram according to the very-low power consumption of a specific embodiment of the present invention.
Figure 11 shows the display controller according to a specific embodiment of the present invention.
Figure 12 shows the sensing signal VCC5Vsense oscillogram according to a specific embodiment of the present invention.
Figure 13 shows the low power consumption display control method process flow diagram according to a specific embodiment of the present invention.
Embodiment
Fig. 2 shows the very-low power consumption display control circuit 300 according to the specific embodiment of the invention, and AC power 302 supply alternating voltages are given through rectifier 310, for example 80 to 220 volts of alternating voltages; Giving bias circuit 320 and transformer (transformer) 330 through rectifier 310 rectification output dc voltages, for example is 120 to 375 volts of DC voltage, and rectifier 310 for example is full bridge rectifier; Power to switch controller of power supply 340 runnings for d. c. voltage signal VDDp through bias circuit 320 bias voltages, d. c. voltage signal VDDp for example is 20 volts of DC voltage, switch controller of power supply 340 is the mimic channel chip, usually be encapsulated as eight pin positions, because cost has been considered the pin number quantitative limitation.Transformer 330 utilizes the coil-induced high tension voltage that it is elementary to convert other suitable voltage in secondary output, supply other circuit running by diode D4, D5 and capacitor C2, C3, for example output dc voltage signal VCC14V and VCC5V, 14 volts and 5 volts of DC voltage are provided respectively, 14 volts of DC voltage can be supplied the running of backlight assembly, for example the running of the backlight assembly of cold cathode fluorescent lamp or light emitting diode.D. c. voltage signal VCC5V process, voltage stabilizer 350, low pressure difference linear voltage regulator (1ow drop-out regulator, be called for short LDO) 350 for example, voltage stabilizing output dc voltage signal VDD3V3 and powering to the running of scale controller 360.Scale controller 360 is according to the running of the voltage condition control switch controller of power supply 340 on the d. c. voltage signal VCC5V of 330 level outputs of transformer, for example, with d. c. voltage signal VCC5V process resistance R 5, what the voltage division signal VCC5Vsense of R6 sent scale controller 360 to progressively approaches register analog-digital converter (successive approximation ADC, abbreviation SAR ADC) detects the voltage condition on the d. c. voltage signal VCC5V, know this technology personage and can understand that progressively to approach the register analog-digital converter be the low speed analog-digital converter that low cost can realize, perhaps, voltage division signal VCC5Vsense is sent to a comparer (not shown) and a reference voltage of scale controller 360, for example 4 volts, detect the voltage condition on the d. c. voltage signal VCC5V; Then, scale controller 360 can utilize universal input and output (general purpose I/0, abbreviation GPIO) the pin position is through the compensation pin position COMP of optically-coupled assembly (opto-coupler or title photocoupler) 370 control switch controller of power supply 340, the unlatching of FEEDBACK CONTROL switch controller of power supply 340 operates opportunity, reaches the purpose of very-low power consumption.It should be noted that, knowing this technology personage can understand switch controller of power supply 340 and be the mimic channel chip, usually being encapsulated as eight pin positions, wherein compensating pin position COMP and provide current source 342 in switch controller of power supply 340 inside, for example is the current source of 200 micromicroamperes (μ A).Bias circuit 320 comprises resistance R 11, R12, R13, diode D21, D22, transistor Q1, Q2, Q3.Bias circuit 320 utilizes resistance R 11, R12, transistor Q1 path that the high-voltage dc voltage bias voltage is powered to switch controller of power supply 340 runnings for d. c. voltage signal VDDP.
Switch controller of power supply 340 utilizes the stored electric charge of capacitor C1, when transistor Q1 closes and stops power supply, running that can of short duration supply switch controller of power supply 340, but, know this technology personage passable electrolysis condenser C1 when also being related to power initiation, really beginning to supply normal DC voltage and operate the needed time, so capacitor C1 can not be too big, for example is 22 microfarads (μ F).Scale controller 360 then can utilize capacitor C2, when cutting off the electricity supply, running that can of short duration supply scale controller 360, typically capacitor C2 is quite big, for example be 2000 microfarads (μ F), it should be noted that the available storage electric power of capacitor C2 is big far beyond capacitor C1.
The very-low power consumption display control circuit 300 that Fig. 2 is shown, behind the shutdown system power supply, utilize the of short duration running that is powered at scale controller 360 of capacitor C2, power to the running of scale controller 360 through voltage stabilizer 350 voltage stabilizing output dc voltage signal VDD3V3, as long as d. c. voltage signal VCC5V is higher than through the d. c. voltage signal VDD3V3 of voltage stabilizer 350 voltage stabilizings output under the situation of operating voltage of scale controller 360, all can operate scale controller 360, the power consumption of voltage stabilizer 350 is extremely low, and makes that the voltage drop LDODrop between d. c. voltage signal VCC5V and d. c. voltage signal VDD3V3 is minimum.The operating voltage of supposing scale controller 360 is 3.3 volts, by the discharge gradually of capacitor C2, as long as d. c. voltage signal VCC5V surpasses (3.3 volts+LDODrop), all can make scale controller 360 runnings.
Behind the shutdown system power supply, scale controller 360 utilizes GPIO pin position to send signal AC_OFF with the voltage status of scale controller 360, give switch controller of power supply 340 ends to draw electric current by resistance R 4 and 370 reactions of optically-coupled assembly, 340 of switch controller of power supply utilize compensation pin position COMP to make current source 342 by resistance R 13, diode D21, D22 and transistor Q3 supply this electric current, for example, the current conversion ratio of optically-coupled assembly 370 (current transfer ration, be called for short CTR) be 1: 1, then the electric current that draws of optically-coupled assembly 370 both sides is 1: 1, is relevant to the level of d. c. voltage signal VCC5V during signal AC_OFF effective (assertion).When the voltage that senses scale controller 360 in compensation pin position COMP when switch controller of power supply 340 is lower than a predetermined level, of short duration driving signal DRV is to open transistor Q4, the elementary external power source that draws of of short duration starting transformer 330, with to capacitor C 1 charging and to secondary big capacitor C 2 chargings of transformer 330, for scale controller 360 the running of next cycle period.The direction of arrow indicates the main current direction in several circuit analyses among Fig. 2, makes to know the running that this technology personage can more understand present embodiment.
For switch controller of power supply 340, when effective signal AC_OFF, it for example is high level, optically-coupled assembly 370 produces couple current, draws required couple current by node A, diode D21, D22 and optically-coupled assembly 370, makes the base voltage of transistor Q3 descend, turn-on transistor Q3 and diode D21, D22, make the compensation pin position COMP drops that powers on, close transistor Q2, make the base potential of transistor Q1 descend and close transistor Q1; Transistor Q3 has the effect that electric current amplifies, and can accelerate the velocity of discharge of current source 342, if the current capacity of the current source 342 in the switch controller of power supply 340 is low, then can save transistor Q3, directly discharges by diode D22.On the other hand, when invalid signals AC_OFF, it for example is low level, influence electricity miscarriage is given birth to, and turn-on transistor Q1 and to capacitor C 1 charging compensates pin position COMP then and goes up voltage and rise gradually, turn-on transistor Q2, make transistor Q1 base earth and close transistor Q1, make switch controller of power supply 340 use the stored electric power of capacitor C 1, make capacitor C 1 discharge; Therefore, whether the switch controller of power supply 340 of whether effectively controlling by signal AC_OFF operates, with control capacitance C1 charging, discharge cycles running.
Fig. 3 shows about the main oscillogram of the very-low power consumption display control circuit 300 of Fig. 2, comprises the waveform relationship figure between signal AC_OFF, voltage signal VDDp, signal DRV, voltage signal VCC5V, the sensing signal VCC5Vsense.Cooperate the very-low power consumption display control circuit 300 of Fig. 2 to describe, in this embodiment, after signal AC_OFF draws high, force current source 342 discharges in the switch controller of power supply 340 to drag down current potential and close transistor Q1 rapidly by diode D21, D22 and optically-coupled assembly 370, force and cut off external power source to the power supply of switch controller of power supply 340, and voltage signal VDDp is dragged down fast, continues to maintain 0 volt one period considerable time, reaches purpose of power saving.After signal AC_OFF drags down, turn-on transistor Q1, to capacitor C 1 charging, make voltage signal VDDp fast rise, after arriving the highest voltage, for example 20 volts, compensation pin position COMP powers on to press and is raised to predetermined level, switch controller of power supply 340 is useful signal DRV momently, for example by width modulation (the pulse width modulation in the switch controller of power supply 340, abbreviation PWM) controller produces the signal DRV of high-low level width modulation momently, perhaps by pulse frequency modulation (pulse frequency modulation, be called for short PFM) the different signal DRV of controller generation frequency, turn-on transistor Q4 makes the elementary of short duration conducting of transformer 330 charge to capacitor C 1 charging and to secondary big capacitor C 2 momently, for example voltage signal VCC5V is drawn high 5 volts rapidly, it can be by relatively reaching with a comparer and a reference voltage, perhaps for example to 2 one scheduled periods of charging of secondary big capacitor C; As long as before voltage signal VCC5V discharges into predetermined voltage, but scale controller 360 is the variation of normal operation monitoring sensing signal VCC5Vsense all, so continue the circulation running, for example, as long as voltage signal VCC5V gets final product normal operation all greater than (3.3 volts+voltage drop LDODrop) in the middle of guaranteeing whole process.Sensing signal VCC5Vsense then shows the variation that discharges and recharges of corresponding voltage signal VCC5V.It should be noted that, voltage signal VDDp continues to maintain 0 volt one period considerable time, make a good distance off during the driving of signal DRV, the consumption that can completely cut off external power source fully, reach the purpose of very-low power consumption, through breadboardin, total electricity consumes below Yue Keda 150 milliwatts (mW), and the extra cost of actual needs expenditure is very low, takes into account considering of cost and usefulness.The running of other auxiliary element in the present embodiment, for example fuse F1, negative temperature coefficient resistance NTC, resistance R 2, capacitor C 4 etc. can be understood just and repeated no more by knowing this technology personage.
Fig. 4 shows the very-low power consumption display control circuit 400 according to another specific embodiment of the present invention, difference compared to the embodiment of Fig. 2 is bias circuit 420, utilize resistance R 18 that bias voltage control is provided, and omission transistor Q3, low order end shows that then 5 vor signal PC5V from PC can be coupled to voltage signal VCC5V by diode D6, to capacitor C 2 chargings; And scale controller 360 also can extensively be integrated in display controller (display controller), is applied to simulated television and Digital Television, not escape category of the present invention.
Fig. 5 shows the very-low power consumption display control circuit 500 according to another specific embodiment of the present invention, and it mainly is the concept that is derived from Fig. 2 embodiment.Similarly signal also adopts the label of front signal, helps to understand the running of present embodiment.Main difference is that switch controller of power supply 540 integrated the like of bias circuit 320 among Fig. 2, and display controller 560 direct detectable voltage signals VDD3V3, saving progressively approaches the pin position of register analog-digital converter or comparer; Perhaps, the variation that display controller 560 can detectable voltage signals VCC5V.For example, before voltage signal VCC5V is higher than 3.3 volts, can utilize GPIO pin position useful signal AC_OFF by display controller 560, make switch controller of power supply 540 stop to draw external power source by optically-coupled assembly 570, compensation pin position COMP; Before voltage signal VDD3V3 falls 3.3 volts soon, by display controller 560 invalid signals AC_OFF, switch controller of power supply 540 momently draws external power source by high-voltage power supply pin position HV by Node B by opening the internal switch (not shown), make the controlled current source 542 of switch controller of power supply 540 inside pass through voltage signal VDDp, to capacitor C 1 charging, drive signal DRV momently, starting transformer 530 elementary, make that 2 chargings reach a predetermined voltage or charge a scheduled period transformer 530 by capacitor C 1 charging of diode D5 and to secondary big capacitor C, that is voltage conversion device 531 comprises transformer 530 and diode D4, D5 is to provide DC voltage output.Switch controller of power supply 540 cuts off external power source for a long time, significantly Jiang Di Mao.The direction of arrow indicates the main current direction in several circuit analyses, makes to know the running that this technology personage can more understand present embodiment.
According to the announcement of above many embodiment, know this technology personage and can make many may the variation, still escape category of the present invention not.For example, display controller 560 utilizes GPIO pin position control signal AC_OFF, by resistance R 4, optically-coupled assembly 570, feedback control compensation pin position COMP, and whether control switch controller of power supply 540 draws external power source, the possibility of other variation can be arranged, for example, can revise near the circuit the optically-coupled assembly 570, make that the high-low level of signal AC_OFF is opposite with respect to the running of switch controller of power supply 540; Perhaps, the collocation auxiliary circuit makes GPIO pin interdigit connect the running that control optically-coupled assembly 570 draws electric current; Perhaps, more than many embodiment be level by GPIO pin position output control signal AC_OFF, by near the circuit the modification optically-coupled assembly 570, can make that GPI0 pin position is the input mode running, as shown in Figure 6, optically-coupled assembly 570 is coupled to the GPIO pin position of display controller 560 by resistance R 72, control by transistor Q8 whether conducting is discharged, effective when control signal CTRL quilt, turn-on transistor Q8 causes the running of switch controller of power supply 540 similar previous embodiment in signal COMP.
Fig. 7 shows the process flow diagram of very-low power consumption display control method according to a particular embodiment of the invention.In step 702, the DC voltage level of sensing transformer secondary output, for example, can sensing Fig. 2 in the variation of signal VCC5V, the perhaps variation of direct sensing signal VDD3V3 for example, guarantees that signal VDD3V3 all is higher than 3.3 volts; In step 704, display controller is by GPIO pin position conducting optically-coupled assembly, the compensation pin position of control switch controller of power supply, and the running of powered-down switching controller, for example, as shown in Figure 5, display controller 560 can increase the size of the couple current of optically-coupled assembly 570 by GPIO pin position useful signal AC_OFF, and the running of powered-down switching controller 540, perhaps, as shown in Figure 6, optically-coupled assembly 570 is coupled to the GPIO pin position of display controller 560, form discharge path by transistor Q8, and the running of powered-down switching controller 540; In step 706, when DC voltage level descend to arrive a predetermined level, the size of the couple current by GPIO pin potential drop low light coupling assembly, the compensation pin position of control switch controller of power supply, and start the running of switch controller of power supply; In step 708, of short duration conducting transformer elementary is to first electric capacity and the of short duration charging of second electric capacity, for example, as shown in Figure 5, by the grid of width modulation or pulse frequency modulation control transistor Q4, make 530 couples of first capacitor C l of transformer and the second secondary capacitor C 2 charge.
Fig. 8 shows the very-low power consumption switch controller of power supply 800 according to a specific embodiment of the present invention, have pin positions such as HV, VDDp, DRV, CS, COMP and GND, when the embodiment running that is applied to Fig. 5, the running of each pin position external circuit of Fig. 8 is as described in the aforementioned embodiment.Very-low power consumption switch controller of power supply 800 comprise comparer 810,820, hysteresis comparator 830, oscillator 840, current source 842, voltage regulator 850, trigger 860, with door 870,872, impact damper 880, control circuit 890, resistance R 80, R82, neat sodium diode DSO.
Fig. 9 shows the main signal waveforms of very-low power consumption switch controller of power supply 800 runnings among Fig. 8, and V (VDDP), V (COMP), I (HV), I (VDDp), V (DRV), 5V signal represent voltage signal, the voltage signal on the COMP pin position, the size of current of HV pin position, the size of current of VDDp pin position, the voltage signal of DRV pin position, the 5V voltage signal of VDDp pin position respectively.When switch controller of power supply 800 has just started, HV pin position is by the charging of the electric capacity (not shown) outside 842 pairs of VDDp pin of current source position, the anode input voltage that is elevated to hysteresis comparator 830 when current potential gradually is higher than the first hysteresis reference voltage VDDH, the output level of hysteresis comparator 830 is high, make to be output as height with door 870, activation voltage regulator 850 output services voltages are in the running of signal 852 power supply source switching controllers 800 inside; And, the output high level of hysteresis comparator 830 passes through or door 892 and phase inverter 894, turn off current source 842, stop HV pin position and draw electric current from the outside, this or door 892 guarantee as long as the output high level of hysteresis comparator 830 can turn off current source 842 block outside power consumption with phase inverter 894 control paths.Oscillator 840 produces the S input end that a square-wave signal is exported to set-reset flip-floop 860, and the R input end of set-reset flip-floop 860 is low level at the beginning, the Q output terminal transfers high level to, on DRV pin position, drawn high level, the outside transistor (not shown) that connects can be switched on, level also can and then be drawn high in current sense (cs) pin position therefore, through comparer 810, the R input end of set-reset flip-floop 860 can change high level into, when set-reset flip-floop 860 is accepted to trigger next time, S input end and the R input end of R trigger 860 are respectively low level and high level, and after the triggering, the Q output terminal transfers low level to, that is to say, the running of this circuit, the input of S input end and R input end are as the criterion just all anti-phase when triggering, to produce pulse-width signal on DRV pin position.For example, square-wave signal is the square-wave signal of 1MHz, reduces the power consumption of very-low power consumption switch controller of power supply 800 under standby mode, by with door 872 and impact damper 880 square-wave signal being exported on DRV pin position.Then, electric capacity (not shown) outside the VDDp pin position slowly disengages stored electric power, anode input voltage up to hysteresis comparator 830 arrives the second hysteresis reference voltage VDDL, make the output level of hysteresis comparator 830 change low by height, make and be output as low with door 870, be output as low with door 872, DRV pin position is output as low, close connection thereon the external transistor (not shown) and close the elementary of external transformer (not shown), as shown in Figure 9, I (HV) signal draws charging current Icharge at the beginning, in V (VDDP) from voltage VDDH to voltage VDDL, the rapid drawdown of I (HV) signal (from external power source) current sinking is Ihv_off.The electric current that I (VDDp) correspondence discharges is Istartup and Iop, the square-wave signal that electric current I op supply switch controller of power supply 800 drives on the DRV pin position.
Then, after the elementary conducting of external transformer, secondary display controller (not shown) side obtains electric power and can operate, and can control V (COMP) signal.The control of the COMP pin position that discloses by previous embodiment, by the compensating signal on the control COMP pin position, the real time length that can allow the time interval that produces pulse-width signal elongate, produce also shortens, but operate under the mode that still allows switch controller of power supply 800 be monitored fully, be unlikely allowing total system is out of control can't be waken up.
When V (COMP) voltage of signals drags down, the running of forced closing oscillator 840, perhaps, the height of the output frequency of modulation oscillator 840 in response to the current potential height of V (COMP) signal, for example, the current potential height of V (COMP) signal then output frequency uprises, the low then output frequency step-down of the current potential of V (COMP) signal, or oppositely running, current potential height that therefore can V (COMP) signal can influence the power consumption of switch controller of power supply 800; And control comparer 820 with positive terminal voltage and feedback reference voltage Voff relatively after, low level is output in feedback control signal 822, make and be output as low level with door 870, the running of forbidden energy voltage regulator 850, the internal power supply of powered-down switching controller 800, make switch controller of power supply 800 enter the very-low power consumption pattern, electric current I (VDDp) moment is reduced to Ioff, preferably electric current I off is less than electric current 0.1*Iop, perhaps lower, it is very slow that the decline rate of V (VDDP) current potential becomes, just V (VDDP) current potential descending slope diminishes, and can significantly elongate next time and begin time to the external capacitive charging by control V (COMP) signal, reduce the power consumption of total system; It should be noted that, drag down V (COMP) signal can so that low level be output in feedback control signal 822 by phase inverter 896 with or door 892 forced closing current sources 842, stop HV pin position and draw electric current from the outside, because this moment, the output of hysteresis comparator 830 was in high level, the running of turn off current source 842.That is to say that simple control circuit 890 comprises or door 892 and phase inverter 894,896 can be controlled current source 842 in good time and start and the opportunity of closing.
Return among Fig. 8, when the action that stops to drag down V (COMP) signal, just after the voltage on the control COMP pin position exceeds feedback reference voltage Voff, feedback control signal 822 level are high, electric current I (VDDp) reverts to Iop, outside big electric capacity (not shown) recovers to supply the running electric power of switch controller of power supply 800 again, switch controller of power supply 800 normal operations are VDDL to V (VDDP) voltage, at this moment, the anode input voltage of hysteresis comparator 830 arrives the second hysteresis reference voltage VDDL, just make the output level of hysteresis comparator 830 change low by height, make and be output as low with door 870, be output as lowly with door 872, the output of DRV pin position transfers low level to.
Then, HV pin position is by after the of short duration charging of electric capacity (not shown) outside the VDDp of 842 pairs of pin positions of current source, and V (VDDp) current potential is charged to VDDH from VDDL, and electric current I (VDDp) begins to discharge so to circulate and operates.And COMP pin position can be passed through gain amplifier 811 earlier, 1/2 gain adjustment for example gains, this gain adjustment can be adjusted according to the side circuit design, after entering the comparison of comparer 810, the R input end of control set-reset flip-floop 860,1 volt (V) is the scope that illustration comparer 810 compares voltage, in this embodiment, comparer 810 will compare in CS pin position voltage and COMP voltage and two level ranges of 1V voltage, and the person familiar with the technology changes when making possible circuit change.
Figure 10 shows that in step 1020, conducting one current source reached for first scheduled period according to the power conversion method process flow diagram of the very-low power consumption of a specific embodiment of the present invention, and for example charging arrives voltage VDDH; In step 1030, the voltage regulator in activation one switch controller of power supply reached for second scheduled period, and produced the driving signal in second scheduled period, for example was pulse-width signal or pulse frequency modulated signal; In step 1040, effective (assert) feedback control signal, it for example is the feedback control signal 822 among Fig. 8, the forbidden energy voltage regulator makes switch controller of power supply enter a very-low power consumption pattern, preferably, under the very-low power consumption pattern institute's consumed current be lower than normal operation size of current 1/10th, perhaps lower, preferably, but effective also forced closing current source of feedback control signal; In step 1060, invalid feedback control signal allows switch controller of power supply recover normal operation arrival external capacitive and discharges into voltage VDDL then, and running just reached for the 3rd scheduled period, and the control external capacitive is charged to voltage VDDH from voltage VDDL.
Please once again with reference to the running of very-low power consumption display control circuit 400 among the figure 4, before voltage signal VCC5V fell 3.3 volts soon, by scale controller 360 invalid signals AC_OFF, scale controller 360 drew external power source momently.When scale controller 360 detects wake events, scale controller 360 can turn back to normal manipulation mode from the very-low power consumption pattern, at this moment, scale controller 360 can also start inner microcontroller by the excitation quartz (controlled) oscillator, therefore can increase power consumption suddenly, cause an of short duration power consumption surging (power surge), if this moment, voltage signal VCC5V just fell 3.3 volts, might cause the misoperation of entire circuit.
Figure 11 shows the display controller 1100 according to a specific embodiment of the present invention, comprises that mainly Power Management Unit 1120, low power consumption control circuit 1130, microcontroller 1150, crystal export into (crystal I/0) circuit 1160, multiplexer 1170 and display controller 1100 inner other relevant power consumption circuit 1140.Low power consumption control circuit 1130 can detect sensing signal VCC5Vsense by voltage detecting circuit 1132, to carry out previous embodiment is carried out low power consumption to switch controller of power supply 1102 battery saving mode running, for example, produce signal AC_OFF by GPIO pin position, to make switch controller of power supply 1102 carry out the battery saving mode running of low power consumption, and voltage detecting circuit 1132 can be progressively to approach register analog-digital converter (successive approximation ADC is called for short SAR ADC) or comparer.In this embodiment, when Power Management Unit 1120 detects wake events, earlier by signal 1122 control multiplexers 1170, with the output signal of two input end selection from Power Management Unit 1120, at this moment, Power Management Unit 1120 invalid signals AC_OFF make switch controller of power supply 1102 take the lead in turning back to normal manipulation mode; Then, Power Management Unit 1120 is by signal 1124 forbidden energy low power consumption control circuits 1130, and close relevant circuit 1140 that can power consumption by signal 1126, for example, can close digital video interface (Digital Visual Interface, DVI) clock pulse amplifier or high-definition multimedia audio/video interface (High-Definition Multimedia Interface, HDMI) clock pulse amplifier etc. interlock circuit.Because switch controller of power supply 1102 enters normal manipulation mode, sensing signal VCC5Vsense can shake rise gradually, display controller 1100 detects sensing signal VCC5Vsense and arrives predetermined level, after perhaps charging reaches a scheduled period, switch controller of power supply 1102 passes through signal 1128 and 1126 with microcontroller 1150, crystal output/input circuit 1160 and inner other relevant power consumption circuit 1140 wake up and operate, crystal output/input circuit 1160 can be couple to outside quartz (controlled) oscillator, start the vibration running that crystal output/input circuit 1160 sides can formally start quartz (controlled) oscillator, make display controller 1100 turn back to normal manipulation mode.According to the exposure of this embodiment, display controller 1100 can be applied to the scale controller 360 of Fig. 4.
Figure 12 shows the sensing signal VCC5Vsense oscillogram according to a specific embodiment of the present invention, after display controller 1100 detects sensing signal VCC5Vsense arrival predetermined level VPD among Figure 11, switch controller of power supply 1102 wakes microcontroller 1150, crystal output/input circuit 1160, multiplexer 1170 and inner other relevant power consumption circuit 1140 up by signal 1128 and 1126 and operates, and makes display controller 1100 turn back to normal manipulation mode.
Figure 13 shows the low power consumption display control method process flow diagram according to a specific embodiment of the present invention, be applied in the display controller, in step 1320, detect sensing signal VCC5Vsense and produce a sensing result, produce a control signal AC_OFF carries out low power consumption with the control switch controller of power supply battery saving mode running according to sensing result, for example, produce control signal AC_OFF by GPI0 pin position, to make switch controller of power supply carry out the battery saving mode running of low power consumption, for example, can utilize analog digital to change this sensing signal to produce this sensing result, perhaps, compare sensing signal VCC5Vsense and a predetermined voltage level to produce sensing result; In step 1340, when wake events occurring, invalid control signal AC_OFF makes switch controller of power supply take the lead in turning back to normal manipulation mode; In step 1360, close the circuit of relevant meeting power consumption in the display controller; In step 1380, detect sensing signal VCC5Vsense and whether arrive predetermined level, after perhaps charging reaches a scheduled period, microcontroller in the display controller, crystal output/input circuit and inner other relevant power consumption circuit waken up operate, make display controller turn back to normal manipulation mode.
In sum, the present invention discloses a kind of display controller, comprises voltage detecting circuit, low power consumption control circuit, Power Management Unit, selector switch, microcontroller and crystal output/input circuit; Voltage detecting circuit detects the voltage level of a sensing signal; The low power consumption control circuit is coupled to voltage detecting circuit, and in order to produce first control signal according to this voltage level, voltage detecting circuit can be analog-digital converter or comparer; Power Management Unit is in order to receive wake events and in order to produce second control signal with in response to wake events; Selector switch is coupled to low power consumption control circuit and Power Management Unit, in order to export first control signal and second control signal alternatively, to control the running that a switch controller of power supply carries out battery saving mode or the normal manipulation mode of low power consumption, selector switch can be multiplexer.When selector switch was exported second control signal, Power Management Unit forbidden energy low power consumption control circuit, microcontroller, crystal output/input circuit and DVI/HDMI clock pulse amplifier were to reduce possible power consumption.
The present invention more discloses a kind of low power consumption display control method, be used for a display controller, comprise: detect a sensing signal to produce sensing result, for example, utilize analog digital to change this sensing signal to produce sensing result, perhaps, by comparing sensing signal and a predetermined voltage level to produce sensing result; Produce a control signal according to sensing result, for example, utilize universal input and output pin position to produce control signal, to control the battery saving mode running that a switch controller of power supply carries out low power consumption; When appearance one wake events, the circuit of relevant power consumption in invalid control signal and the forbidden energy display controller, for example, forbidden energy microcontroller, crystal output/input circuit and DVI/HDMI clock pulse amplifier; At last, wake display controller up and turn back to normal manipulation mode.
In sum, disclose as above with preferred embodiment though the present invention is own, yet it is not in order to limit the present invention.Anyly be familiar with this operator, without departing from the spirit and scope of the present invention, when can doing the various changes that are equal to or replacement, protection scope of the present invention is when looking accompanying being as the criterion that the application's claim scope defines.
Claims (11)
1. display controller comprises:
One microcontroller;
One crystal output/input circuit;
One digital video interface clock pulse amplifier or a high-definition multimedia audio/video interface clock pulse amplifier;
One voltage detecting circuit, in order to detect a voltage level that is associated with the sensing signal of Circuit Fault on Secondary Transformer, wherein sensing signal show Circuit Fault on Secondary Transformer voltage level discharge and recharge variation;
One low power consumption control circuit is coupled to this voltage detecting circuit, in order to produce one first control signal according to this voltage level;
One Power Management Unit is in order to receive a wake events and in order to produce one second control signal with in response to this wake events; And
One selector switch, be coupled to this low power consumption control circuit and this Power Management Unit, in order to export this first control signal and this second control signal alternatively, to control the running that a switch controller of power supply carries out battery saving mode or the normal manipulation mode of low power consumption, when this selector switch is exported this second control signal, this low power consumption control circuit of this Power Management Unit forbidden energy, this microcontroller, this crystal output/input circuit and digital video interface/high-definition multimedia audio/video interface clock pulse amplifier is to reduce possible power consumption.
2. display controller according to claim 1 is characterized in that, this selector switch is a multiplexer.
3. display controller according to claim 1 is characterized in that, this voltage detecting circuit is an analog-digital converter or a comparer.
4. a low power consumption display control method is used for a display controller, comprising:
Detect a sensing signal that is associated with Circuit Fault on Secondary Transformer to produce a sensing result, wherein sensing signal show Circuit Fault on Secondary Transformer voltage level discharge and recharge variation;
Produce a control signal according to this sensing result, to control the battery saving mode running that a switch controller of power supply carries out a low power consumption;
When a wake events occurring, the circuit of relevant power consumption in invalid this control signal and this display controller of forbidden energy; And
Wake this display controller up and turn back to a normal manipulation mode.
5. control method according to claim 4 is characterized in that, this produces this control signal step is to utilize a universal input and output pin position to produce this control signal.
6. control method according to claim 4 is characterized in that, this detection step is to utilize analog-digital converter to change this sensing signal to produce this sensing result.
7. control method according to claim 4 is characterized in that, this detection step be relatively this sensing signal and a predetermined voltage level to produce this sensing result.
8. control method according to claim 4 is characterized in that, this wake-up step is when this sensing signal arrives a predetermined voltage level, wakes this display controller up and turns back to this normal manipulation mode.
9. control method according to claim 4 is characterized in that, a microcontroller and a crystal output/input circuit in this invalid this this display controller of control signal step forbidden energy.
10. control method according to claim 4 is characterized in that, a digital video interface clock pulse amplifier in this invalid this this display controller of control signal step forbidden energy.
11. control method according to claim 4 is characterized in that, this invalid this control signal step forbidden energy one high-definition multimedia audio/video interface clock pulse amplifier.
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| CN 200910208350 CN102054462B (en) | 2009-11-05 | 2009-11-05 | Low power consumption display control method and relevant display controller |
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| CN107068097A (en) * | 2017-05-12 | 2017-08-18 | 惠科股份有限公司 | Display device and power saving method thereof |
| CN108153189B (en) * | 2017-12-20 | 2020-07-10 | 中国航空工业集团公司洛阳电光设备研究所 | Power supply control circuit and method for civil aircraft display controller |
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