CN101630906A - DC-DC transformer with PWM/PFM automatic switching and OLED display - Google Patents
DC-DC transformer with PWM/PFM automatic switching and OLED display Download PDFInfo
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Abstract
The invention provides a DC-DC transformer with automatic switching between Pulse Width Modulation (hereinafter referred to PWM) and Pulse Frequency Modulation (hereinafter referred to PFM), which is used in an Organic Light Emitting Diode (hereinafter referred to OLED) display and judges the power consumption of an OLED array of the OLED display according to the display data of the OLED display so as to further determine a PWM/PFM switching time. The DC-DC transformer with PWM/PFM automatic switching comprises a content statistic unit, an automatic switching control unit, a PWM controller, a PFM controller and a power supply generation unit, wherein the content statistic unit receives the display data of the OLED display and takes data statistics and then outputs a statistic, and according to the statistic, the automatic switching unit outputs a mode control signal for controlling the PWM controller and the PFM controller and using a PWM control mode and a PFM control mode.
Description
Technical field
The invention relates to (the Pulse Width Modulation that has pulse-width modulation, hereinafter to be referred as PWM) and pulse frequency modulated (Pulse Frequency Modulation, hereinafter to be referred as PFM) direct current that automaticallyes switch is to commutator transformer (DC-DC Converter), particularly about being used in organic light emitting diode (ORGANIC LIGHT EMITTING DIODE is hereinafter to be referred as OLED) display and selecting the DC-DC transformer that PWM/PFM automaticallyes switch that has of pwm pattern or PFM control model according to its video data.
Background technology
The OLED display is to utilize luminous element to produce the effect of demonstration.The OLED display is to come display frame along with pixel (Pixel) flows through the different differences that produce on becoming clear of electric current.Because the electric current of each pixel can be along with display variation, also cause the difference of the maximum power consumption of OLED module (Module) and minimum power consumption very big.How the power supply of OLED module stability is provided, for example less ripple (smallripple), and take into account efficient (efficiency), just become a major challenge.
The DC-DC transformer has two kinds of drivings (modulation) mode, is respectively pulse-width modulation (PWM) and pulse frequency modulated (PFM).With the viewpoint of efficient, PWM is fit to use the situation at large current load (CurrentLoading), and PFM is useful in lighter current loading.Most DC-DC transformer all only uses single modulation system, also has part DC-DC transformer to be used as judging the switching of PWM/PFM with the size of current loading.But the size with current loading is used as judging that the switching of PWM/PFM is not a nothing the matter.
Below explanation DC-DC automatic switchover PWM/PFM operates the prior art that mould shows.Fig. 1 is a United States Patent (USP) the 7th, 173, shown in No. 404, the DC-DC transformer 10 of this automatic switchover comprises a starter (Starter) 102, one automatic PWM/PFM controller (Auto PWM/PFM controller) 103, one PWM controller (PWM controller) 106, one PFM controller (PFM controller), 108 and one power supply switch unit (Power Switch Unit) 110, wherein, the load shown in this figure (Load) 112 can be the OLED module of OLED display.
Starter 102 transmission one startup enables (Starting-Enabling) signal and enables this automatic PWM/PFM controller 103 for automatic PWM/PFM controller 103.Afterwards, PWM controller 106 and PFM controller 108 can transmit feedback signal (Feedback Signal) respectively and give automatic PWM/PFM controller 103.Automatically PWM/PFM controller 103 promptly produces a selection signal according to the feedback signal of PWM controller 106 and PFM controller 108, and outputs to PWM controller 106 and PFM controller 108.So PWM/PFM controller 103 utilizes and selects signal to enable (Enable) PWM controller 106 or PFM controller 108 automatically.The controller that is enabled (PWM controller 106 or PFM controller 108) can output one control signal be given power supply switch unit 110.Therefore, this power supply switch unit 110 can be given load 112 according to this control signal switching and output DC source.Simultaneously, load 112 also can transmit another and feed back signal to PWM controller 106 and PFM controller 108.
Therefore, the DC-DC transformer 10 of this automatic switchover is to control power supply in the mode of loop circuit (close loop) to switch.Generally speaking, the control model of loop circuit is complicated, so cost is higher.
Summary of the invention
Because the problems referred to above, the DC-DC transformer that PWM/PFM automaticallyes switch that has that the objective of the invention is to propose a kind of OLED of being used in display and select PWM or PFM control model according to video data.
For reaching above-mentioned purpose, the DC-DC transformer that the present invention has the PWM/PFM automatic switchover comprises a content statistics unit, behind the video data of reception and statistics OLED display, exports a statistical value; One automatic switchover control unit is after the receiving and counting value, according to this statistical value size output one mode control signal; One PDM keyer receives this mode control signal, and when this mode control signal is first state, exports a PWM power supply; One pulse frequency modulated controller receives this mode control signal, and when this mode control signal is second state, exports a PFM power supply; And a power supply generation unit, receive PWM power supply or PFM power supply, and then output is as driving voltage.
Description of drawings
Fig. 1 is the Organization Chart of the DC-DC transformer of the automatic switchover selected of the known PWM/PFM of having;
Fig. 2 is the Organization Chart that the present invention has the DC-DC transformer of PWM/PFM automatic switchover;
Fig. 3 is the schematic diagram of the input data statistic of a picture;
Fig. 4 is the Organization Chart of first embodiment of statistic unit of the present invention;
Fig. 5 is the Organization Chart of second embodiment of statistic unit of the present invention;
Fig. 6 is the Organization Chart of the 3rd embodiment of statistic unit of the present invention;
Fig. 7 is the schematic diagram of this kind enforcement aspect;
Fig. 8 is the second embodiment Organization Chart of the OLED display of built-in DC-DC transformer;
Fig. 9 is the 3rd an embodiment Organization Chart of the OLED display of built-in DC-DC transformer.
[main element symbol description]
10 DC-DC transformers
102 starters (Starter)
103 automatic PWM/PFM controllers (controller)
106,213 PWM controllers (PWM controller)
108,214 PFM controllers (PFM controller)
110,215 power supply generation units (Power Generating Unit)
112 loads (Load)
20 OLED displays
21 DC-DC transformers
211 statistic units
212 automatic switchover control units
220,820,920 sequential transducers
222,822,922 display driver elements
224 OLED arrays
40,50,60 statistic units
401 adders
403 buffers
505 multipliers
507,607 forms of tabling look-up
826,926 memories
Embodiment
Have the DC-DC transformer of PWM/PFM automatic switchover and the OLED display that uses this transformer below with reference to graphic detailed description the present invention.
The technical characterictic of OLED module is the bright more power consumption more of pixel, so the black entirely and complete white picture power consumption of OLED module has a long way to go.Based on this power consumption characteristic, carry out suitable substance P WM/PFM and switch the efficient that can improve the DC-DC transformer, reach the target that the power consumption of OLED display descends.The product of general general DC-DC transformer can only be brought in the size of judging current loading from load, and carries out the PWM/PFM switching.But because the OLED display driver (DisplayDriver) of built-in DC-DC transformer can know that this OLED display is at present with content displayed.Therefore, the DC-DC transformer that the present invention has the PWM/PFM automatic switchover utilizes video data to judge OLED array power consumption size, and then some switching time of decision PWM/PFM.
Fig. 2 is the first embodiment Organization Chart of the OLED display of built-in DC-DC transformer.As shown in the drawing, OLED display 20 comprises one and has DC-DC transformer 21, a sequential converter 220, a display driver element 222 and the OLED array 224 that PWM/PFM automaticallyes switch.Sequential transducer 220 receives video data, and dateout arrives display driver element 222 after adjusting sequential.Afterwards, by display driver element 222 driving OLED arrays 224.Because sequential transducer 220, display driver element 222 and OLED array 224 are general OLED display architectures, its detailed content is not at this repeated description.
The DC-DC transformer 21 that the present invention has the PWM/PFM automatic switchover comprises a statistics unit 211, an automatic switchover control unit 212, a PWM controller 213, a PFM controller 214 and a power supply generation unit (Power Generating Unit) 215.Statistic unit 211 receives the video data of this OLED display 20, and is added up back output one statistical value.Generally speaking, this statistic unit 211 be the statistics each display frame data after export statistical value.The statistical value that automatic switchover control unit 212 is exported according to statistic unit 211 decides the control model that will use, and exports a mode control signal.When statistical value is big, represent display frame bright partially, the power consumption of OLED display is bigger, so employing PWM pattern, this mode control signal is first state, can but be not limited to the high levels signal; Otherwise, when statistical value hour, represent display frame dark partially, the power consumption of OLED display is less, so will adopt the PFM pattern, this mode control signal is second state, can but be not limited to the low level signal.PWM controller 213 receives this mode control signal with PFM controller 214, when this mode control signal is first state, PWM controller 213 outputs one PWM power supply, when this mode control signal was second state, PFM controller 214 outputs one PFM power supply was given power supply generation unit 215.Power supply generation unit 215 receives PWM power supply or PFM power supply, and offers display driver element 222 and OLED array 224.
Fig. 3 is the statistical form at the input data of a picture (frame).As shown in the drawing, abscissa is the input data, and ordinate is a count value, adds up and divided by obtaining a mean value after the data volume.Size according to this mean value can just slightly be predicted the current loading of OLED array, and then selects suitable control model, and for example PWM is fit to use the situation at large current load, and PFM is useful in lighter current loading.Though the mean value of generation is arranged in this statistical form, can directly adopt statistical value to judge in the practical application and get final product.
Fig. 4 is the Organization Chart of first embodiment of statistic unit of the present invention.As shown in the drawing, statistic unit 40 comprises an adder 401 and a buffer 403.After the temporary value addition of adder 401 with each video data and buffer 403, return and deposit to buffer 403.And statistic unit 40 is when vertical synchronizing signal is enabled, and the temporary value of output buffer 403 is as statistical value, and buffer 403 is removed.Therefore, automatic switchover control unit 212 can compare this statistical value and a critical value, and the output mode control signal.That is when statistical value during greater than this critical value, this mode control signal is the high levels signal, uses the PWM pattern that adopts; And when statistical value during less than this critical value, this mode control signal is the low level signal, uses the PFM pattern that adopts.Work as statistical value in the present embodiment and equal this critical value, this mode control signal is the high levels signal, also can be the low level signal during practical application.
Fig. 5 is the Organization Chart of second embodiment of statistic unit of the present invention.As shown in the drawing, statistic unit 50 comprises a multiplier 505, table look-up form 507, an adder 401 and a buffer 403.On the practice, because the pixel value current sinking actual with it of the video data of OLED array is not in direct ratio, so this embodiment utilization form 507 of tabling look-up writes down the weights of the actual consumption electric current of each pixel value.So statistic unit 50 is exported to adder 401 after utilizing multiplier 505 that video data is multiplied by weights earlier again, makes statistic unit can reflect more real state.Identical with the first embodiment statistic unit 40 as for adder 401 with the framework of buffer 403, repeated description no longer.
Fig. 6 is the Organization Chart of the 3rd embodiment of statistic unit of the present invention.As shown in the drawing, statistic unit 60 comprises table look-up form 607, an adder 401 and a buffer 403.On the practice, because the pixel value current sinking actual with it of the video data of OLED array is not in direct ratio, so this embodiment utilization form 507 of tabling look-up writes down the relative value of the actual consumption electric current of different pixel values.So statistic unit 60 utilization is tabled look-up and is exported to adder 401 again after form 607 changes into each pixel value of video data the relative value of actual consumption electric current.Identical with the first embodiment statistic unit 40 as for adder 401 with the framework of buffer 403, repeated description no longer.
Moreover automatic switchover control unit 212 of the present invention has two kinds to implement aspect.Judge for single critical value for first kind.That is 212 of automatic switchover control units set a critical value, when statistical value during greater than (or equaling) this critical value, just switch to the PWM pattern; Otherwise, just switch to the PFM pattern when statistical value during less than this critical value.Second kind is the judgement that two critical values are carried out.Too frequent for fear of the different mode switching, can adopt similar Shi Mite to trigger the judgment mode of (Smitt Trigger).Fig. 7 shows the schematic diagram of this kind enforcement aspect.That is, set first critical value and two critical values of second critical value, first critical value is less than second critical value, first critical value as shown in Figure 7 and second critical value.If be the PFM pattern at present, statistical value must surpass second critical value just can switch to the PWM pattern.If be the PWM pattern at present, statistical value must just can switch to the PFM pattern less than first critical value.Therefore, if adopt second kind of two critical switching mode, when statistical value was between first critical value and second critical value, automatic switchover control unit 212 was to keep existing pattern.
In addition, owing to after the calculating of statistic unit must receive the data of a picture frame (Frame), could export the statistical value of this picture frame.Therefore, the switching meeting of the PWM/PFM of first embodiment of the OLED display of built-in DC-DC transformer is than the time of late 1 picture frame of displaying contents.For example frame rate (Frame rate) then can just can be made the selection of PWM/PFM evening in 1/60 second when being 60Hz switching time.But, because general picture all has continuity, therefore 1/60 second delay can't influence the performance that DC-DC transformer of the present invention switches.
Fig. 8 is the second embodiment Organization Chart of the OLED display of built-in DC-DC transformer.As shown in the drawing, OLED display 80 comprises one and has DC-DC transformer 21, a sequential converter 820, a display driver element 822, a memory 826 and the OLED array 224 that PWM/PFM automaticallyes switch.The DC-DC transformer 21 of this embodiment is identical with the DC-DC transformer 21 of the OLED display 20 of first embodiment, so repeat specification DC-DC transformer 21 no longer.Just, DC-DC transformer 21 is data that reception memorizer 826 is exported.And this embodiment OLED display 80 mainly is to increase by a memory 826.Memory 826 is in order to receive and the storage video data.Sequential transducer 820 output control signals are given memory 826 and display driver element 822, use allowing memory 826 dateouts give display driver element 822, and display driver element 822 are according to the data-driven OLED array 224 that is received.Because sequential transducer 820, memory 826, display driver element 822 and OLED array 224 are general OLD display architectures, its detailed content is not at this repeated description.
Fig. 9 is the 3rd an embodiment Organization Chart of the OLED display of built-in DC-DC transformer.As shown in the drawing, OLED display 90 comprises one and has DC-DC transformer 21, a sequential converter 920, a display driver element 922, a memory 926 and the OLED array 224 that PWM/PFM automaticallyes switch.The DC-DC transformer 21 of this embodiment is identical with the DC-DC transformer 21 of the OLED display 80 of second embodiment, so repeat specification DC-DC transformer 21 no longer.And the difference of the OLED display 80 of this embodiment OLED display 90 and second embodiment is that the data of display driver element 922 are provided by sequential transducer 920.Therefore, DC-DC transformer 21 is to receive the data that sequential transducer 920 is exported.Because sequential transducer 920, memory 926, display driver element 922 and OLED array 224 are general OLD display architectures, its detailed content is not at this repeated description.
Because DC-DC transformer 21 of the present invention is directly directly to control the switching of PWM/PFM according to video data, and does not need current loading, that is at the current sinking that is the OLED array, feeds back to the DC-DC transformer.Therefore framework of the present invention wants simple compared to the feedback system that known technology adopted.
Though more than with embodiment the present invention is described, therefore do not limit scope of the present invention, only otherwise break away from main idea of the present invention, the sector person can carry out various distortion or change.For example, the OLED display can increase the buffering area that storage stack is used as video data again, uses the video data that allows DC-DC transformer 21 read this buffering area earlier, in order to the pattern of instant adjustment PWM/PFM.
Claims (9)
1, a kind of direct current with pulse-width modulation PWM/pulse frequency modulated PFM automatic switchover is to commutator transformer, and in order to the supply voltage of organic light emitting diode (OLED) display to be provided, this direct current comprises commutator transformer:
One content statistics unit, receive and add up the video data of aforementioned OLED display after, export a statistical value;
One automatic switchover control unit is exported a mode control signal according to aforementioned statistical value, and wherein, this mode control signal is first state or second state;
One PDM keyer receives the previous mode control signal, when this mode control signal is first state, exports a PWM power supply;
One pulse frequency modulated controller receives the previous mode control signal, when this mode control signal is second state, exports a PFM power supply; And
One power supply generation unit, in order to receiving aforementioned PWM power supply or PFM power supply respectively, and then output is as aforementioned power source voltage.
2, the direct current with pulse-width modulation/pulse frequency modulated automatic switchover as claimed in claim 1 is characterized in that to commutator transformer aforementioned content statistics unit comprises:
One buffer; And
One adder, in order to receiving the pixel value of aforementioned video data, and with the storing value addition of aforementioned buffer after, deposit and be back to aforementioned buffer;
Wherein, this content statistics unit also receives a vertical synchronizing signal, when this vertical synchronizing signal is enabled, exports the storing value of aforementioned buffer, in order to as aforementioned statistical value, and removes the storing value of this buffer.
3, the direct current with pulse-width modulation/pulse frequency modulated automatic switchover as claimed in claim 1 is characterized in that to commutator transformer aforementioned content statistics unit comprises:
One form of tabling look-up in order to writing down the corresponding weights of power consumption of each pixel value, and then is exported its corresponding weights according to aforementioned video data;
One multiplier receives aforementioned video data and aforementioned weights, and then exports weights data;
One buffer; And
One adder, in order to receiving aforementioned weights data, and with the storing value addition of aforementioned buffer after, deposit and be back in the aforementioned buffer;
Wherein, this content statistics unit also receives a vertical synchronizing signal, and when this vertical synchronizing signal was enabled, the storing value of exporting aforementioned buffer was as aforementioned statistical value, and removes the storing value of this buffer.
4, the direct current with pulse-width modulation/pulse frequency modulated automatic switchover as claimed in claim 1 is characterized in that to commutator transformer aforementioned content statistics unit comprises:
One form of tabling look-up in order to writing down the corresponding numerical value of power consumption of each pixel value, and is exported its corresponding aforementioned numerical value according to aforementioned video data;
One buffer; And
One adder receives aforementioned numerical value, and with the storing value addition of aforementioned buffer after, deposit and be back in the aforementioned buffer;
Wherein, this content statistics unit also receives a vertical synchronizing signal, and when this vertical synchronizing signal was enabled, the storing value of exporting aforementioned buffer was as aforementioned statistical value, and removes the storing value of this buffer.
5, as claimed in claim 1 have the direct current of pulse-width modulation/pulse frequency modulated automatic switchover to commutator transformer, wherein aforementioned automatic switchover control unit comprises a comparator, it is characterized in that, when aforementioned statistical value is greater than or equal to a critical value, the previous mode control signal is set at first state, when aforementioned statistical value is lower than this critical value, the previous mode control signal is set at second state.
6, as claimed in claim 1 have the direct current of pulse-width modulation/pulse frequency modulated automatic switchover to commutator transformer, it is characterized in that, when aforementioned automatic switchover control unit when the previous mode control signal is set at first state and aforementioned statistical value and is lower than one first critical value, the previous mode control signal is set at second state, when aforementioned mode control signal is set at this second state and aforementioned statistical value and is higher than one second critical value, the previous mode control signal is set at this first state.
7, a kind of built-in direct current comprises the OLED display of commutator transformer:
One sequential converter in order to the reception video data, and is exported an aforementioned video data and a control signal after adjusting sequential;
One display driver element is connected with aforementioned sequential transducer, in order to output drive signal;
One OLED array is connected with the aforementioned display driver element, in order to according to this drive signal display frame; And
One has the direct current of pulse-width modulation/pulse frequency modulated automatic switchover to commutator transformer, in order to provide a supply voltage to aforementioned OLED array;
Wherein, aforementioned direct current with pulse-width modulation/pulse frequency modulated automatic switchover more comprises commutator transformer:
One content statistics unit receives and adds up aforementioned video data, and then exports a statistical value;
One automatic switchover control unit is exported a mode control signal according to this statistical value, and wherein, this mode control signal is first state or second state;
One PDM keyer receives the previous mode control signal, when this mode control signal is first state, exports one first power supply;
One pulse frequency modulated controller receives the previous mode control signal, and when this mode control signal is second state, exports a second source; And
One power supply generation unit receives aforementioned first power supply or second source, and then output is as aforementioned driving voltage.
8, a kind of built-in direct current comprises the OLED display of commutator transformer:
One memory receives and the storage video data;
One sequential converter is connected with aforementioned memory, and exports an aforementioned video data and a control signal;
One display driver element is connected with aforementioned sequential transducer, and then exports a drive signal;
One OLED array is connected with the aforementioned display driver element, in order to according to this drive signal display frame; And
One has direct current that pulse-width modulation/pulse frequency modulated automaticallyes switch to commutator transformer, and provides a supply voltage to aforementioned OLED array;
Wherein, aforementioned direct current with pulse-width modulation/pulse frequency modulated automatic switchover more comprises commutator transformer:
One content statistics unit receives the video data of aforementioned OLED display, and will export a statistical value after the video data statistics that be received;
One automatic switchover control unit, receive aforementioned statistical value after, and export a mode control signal according to this statistical value, wherein, this mode control signal is first state or second state;
One PDM keyer receives the previous mode control signal, when this mode control signal is first state, exports one first power supply;
One pulse frequency modulated controller receives the previous mode control signal, when this mode control signal is second state, exports a second source; And
One power supply generation unit receives aforementioned first power supply or second source, and then output is as aforementioned driving voltage.
9, a kind of built-in direct current comprises the OLED display of commutator transformer:
One memory receives and the storage video data, and exports aforementioned video data according to a control signal;
One sequential converter is exported the aforementioned aforementioned memory that controls signal to, and exports a driver element control signal;
One display driver element, the aforementioned video data and the aforementioned driver element control signal of reception aforementioned memory are in order to export a drive signal;
One OLED array is connected with the aforementioned display driver element, in order to according to this drive signal display frame; And
One has direct current that pulse-width modulation/pulse frequency modulated automaticallyes switch to commutator transformer, and provides a supply voltage to aforementioned OLED array;
Wherein, aforementioned direct current with pulse-width modulation/pulse frequency modulated automatic switchover comprises commutator transformer:
One content statistics unit receives the video data of aforementioned OLED display, and will export a statistical value after the video data statistics that be received;
One automatic switchover control unit, receive aforementioned statistical value after, and export a mode control signal according to this statistical value, wherein, this mode control signal is first state or second state;
One PDM keyer receives the previous mode control signal, when this mode control signal is first state, exports one first power supply;
One pulse frequency modulated controller receives the previous mode control signal, when this mode control signal is second state, exports a second source; And
One power supply generation unit receives aforementioned first power supply or second source, and then output is as aforementioned driving voltage.
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