CN100559449C - The method of the liquid crystal indicator of dynamic switch drive mode and reduction power consumption - Google Patents
The method of the liquid crystal indicator of dynamic switch drive mode and reduction power consumption Download PDFInfo
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- CN100559449C CN100559449C CNB2007101953457A CN200710195345A CN100559449C CN 100559449 C CN100559449 C CN 100559449C CN B2007101953457 A CNB2007101953457 A CN B2007101953457A CN 200710195345 A CN200710195345 A CN 200710195345A CN 100559449 C CN100559449 C CN 100559449C
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Abstract
The invention discloses a kind of liquid crystal indicator of dynamic switch drive mode and reduce the method for its power consumption, this liquid crystal indicator comprises a display panels, an input interface, an oscillator, a controller and a driver.This display panels comprises a plurality of liquid crystal capacitances, is used for producing an image.This input interface is used for producing the one scan control signal.This oscillator is used for producing a predeterminated frequency.This controller is electrically connected on this oscillator, is used for exporting first current controling signal when the frequency of this scan control signal is lower than this predeterminated frequency.This actuator electrical is connected in this controller and is used for exporting one first bias current according to this current controling signal and gives this display panels, to be used for to these a plurality of liquid crystal capacitances chargings.
Description
Technical field
The present invention relates to a kind of liquid crystal indicator, but relate in particular to a kind of liquid crystal indicator of dynamic switch drive mode and reduce the method for its power consumption.
Background technology
Function advanced person's display gradually becomes the valuable feature of consumption electronic product now, and wherein liquid crystal indicator has become the display that various electronic equipments such as mobile phone, PDA(Personal Digital Assistant), digital camera, computer screen or the widespread use of mobile computer screen institute have the high-resolution color screen gradually.
See also Fig. 1, Fig. 1 is the synoptic diagram of the liquid crystal indicator of prior art.Liquid crystal indicator 10 comprises time schedule controller 14, source electrode driver (source driver) 16, gate drivers (gatedriver) 18 and display panels 20.When the frequency signal pulse that time schedule controller 14 produces is sent to gate drivers 18, gate drivers 18 can produce sweep signal to display panels 20, at the same time, 14 of time schedule controllers can send the frequency signal pulse to source electrode driver 16, and source electrode driver 16 will receive the digital data signal that time schedule controller 14 is transmitted, and output driving current is to the pixel 22 of display panels 20.
See also Fig. 2, Fig. 2 is the pixel of display panels shown in Figure 1 and the equivalent circuit diagram of source electrode driver.Each pixel 22 of display panels 20 can equivalence be the combination of circuits of resistance R and capacitor C (being considered as liquid crystal capacitance).Source electrode driver 18 can be exported a bias current according to digital data signal makes capacitor C charge to the voltage quasi position of wanting so that capacitor C between liquid crystal molecule show different GTGs according to the voltage quasi position rotation.Yet for display panels or the different data line load (data line loading) of satisfying the different size size, the driving force of source electrode driver 18 also should appropriate adjustment.The driving force of source electrode driver 18 depends on the output resistance and bias current (biascurrent) size of output stage, and the two is a fixed value usually.Therefore source electrode driver is installed on after the liquid crystal indicator, the bias current of its output also becomes definite value.
Partly the source electrode driver of prior art comprises electric charge and shares (charge sharing)/electric charge recovery (charge recycling) technology, can help to save output current and power consumption, but, these technology of use increase because will making source electrode driver export the data line required time to, therefore and can't use on the LCD higher in resolution, that the duration of charging is short, otherwise will cause the phenomenon of data line and liquid crystal capacitance undercharge.
In order to reduce power consumption, under battery saving mode, liquid crystal indicator can lower picture sweep frequency (frame rate).For instance, liquid crystal indicator its picture sweep frequency under normal operation can be 60 hertz (Hz), once enter battery saving mode, then the picture sweep frequency can be reduced to 30Hz.But, actual power consumption is not as expectedly reducing with picture sweep frequency equal proportion, even reason is the picture sweep frequency and reduces, but the bias current that source electrode driver is exported still is definite value, and driving so bias current power influences is not descended.But do not need so big bias current and driving force this moment in fact,, or start the type of drive that electric charge reclaims (chargerecycling), can more effectively save power consumption if can appropriateness reduce the bias current of source electrode driver output stage.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of liquid crystal indicator of dynamic switch drive mode and the method that reduces the liquid crystal indicator power consumption, when picture sweep frequency (frame rate) descends, the dynamic bias current of Controlling Source driver, or the type of drive of change setting, for example electric charge reclaims (charge recycling), to reduce the display panels power consumption.Because the liquid crystal duration of charging is elongated, thus fan-out capability reduced, or increased the time that electric charge reclaims, source electrode driver also has the enough time to data line and liquid crystal capacitance charging.
For achieving the above object, the invention provides the liquid crystal indicator that a kind of cpable of lowering power consumes, it comprises a display panels, an input interface, an oscillator, a controller and a driver.This display panels comprises a plurality of liquid crystal capacitances, is used for producing an image.This input interface is with importing picture element data and signal, and controller is used for producing gate drivers (gate driver) and source electrode driver (sourcedriver) control signal and picture element data.This oscillator is used for producing a predeterminated frequency.The built-in comparer of this controller also is connected in this oscillator, is used for the relatively frequency of this specific scan control signal, and the output control signal is given this driver.This actuator electrical is connected in this controller and is used for according to this current controling signal output gray scale voltage and according to this display panels, to be used for to these a plurality of liquid crystal capacitance chargings.
And, for achieving the above object, the invention provides a kind of method that reduces the liquid crystal indicator power consumption, this liquid crystal indicator comprises a display panels, this display panels comprises a plurality of liquid crystal capacitances, and this method comprises: select a picture sweep frequency; Produce the one scan control signal according to this picture sweep frequency; And export first bias current or second bias current gives this display panels according to this scan control signal, to be used for to these a plurality of liquid crystal capacitances chargings.
And, for achieving the above object, the invention provides a kind of method that reduces the liquid crystal indicator power consumption, this liquid crystal indicator comprises a display panels, this display panels comprises a plurality of liquid crystal capacitances, and this method comprises: (a) produce the one scan control signal; (b) provide a predeterminated frequency; (c) export a current controling signal according to frequency and this predeterminated frequency of this scan control signal; And (d) export a bias current according to this current controling signal and give this display panels, to be used for to these a plurality of liquid crystal capacitance chargings.
The invention provides and a kind ofly can dynamically adjust the bias current of source electrode driver and the liquid crystal indicator of type of drive.Source electrode driver can selectively be exported different bias currents and enable/cancel technology such as electric charge recovery according to different picture sweep frequencies, therefore reduces the display panels power consumption.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
The synoptic diagram of the liquid crystal indicator of Fig. 1 prior art;
Fig. 2 is the pixel of display panels of Fig. 1 and the equivalent circuit diagram of source electrode driver;
Fig. 3 is the synoptic diagram of liquid crystal indicator first embodiment of the present invention;
When Fig. 4 reclaims running for electric charge, the variation synoptic diagram of pixel voltage;
Fig. 5 A and Fig. 5 B be pixel when the picture sweep frequency of 60Hz and 30Hz, different bias currents are to the synoptic diagram of liquid crystal capacitance charging;
Fig. 6 is the liquid crystal indicator of a prior art and liquid crystal indicator of the present invention graph of a relation at different pictures sweep frequency and power;
Fig. 7 can reduce the method flow diagram of liquid crystal indicator power consumption for the present invention;
Fig. 8 is the calcspar of liquid crystal indicator second embodiment of the present invention;
Fig. 9 can reduce the other method process flow diagram of liquid crystal indicator power consumption for the present invention.
Wherein, Reference numeral:
10,100: liquid crystal indicator 14,104,204 time schedule controllers
16,106: source electrode driver 18,108: gate drivers
120,22: pixel cell 20,110: display panels
101,201: processing unit 102,202: input interface
122: transistor 124: liquid crystal capacitance
206: comparer 208: oscillator
210: controller 200: liquid crystal indicator
Embodiment
See also Fig. 3, Fig. 3 is the synoptic diagram of liquid crystal indicator first embodiment of the present invention.Liquid crystal indicator 100 can be personal computer or mobile computer.Liquid crystal indicator 100 comprises processing unit 101, input interface 102, time schedule controller (timing controller) 104, source electrode driver 106, gate drivers 108 and display panels 110.Processing unit 101 is used for controlling the running of liquid crystal indicator 100.(Chip onfilm COF), or is arranged on the glass substrate that (Chip of glass COG), and then is electrically connected with circuit board by flexible circuit board to source electrode driver 106 to be arranged on the flexible circuit board with gate driver 108.Time schedule controller 104 be coupled to source electrode driver 106 with gate driver 108.Display panels 110 comprises a plurality of pixel cells (pixel) 120, and each pixel cell 120 comprises transistor 122 and liquid crystal capacitance 124, is used for show image.When the frequency signal pulse that time schedule controller 104 produces was sent to gate drivers 108, gate drivers 108 can produce sweep signals to display panels 110, made the transistor 122 of pixel cell 120 of display panels 110 each row open; At the same time, 104 of time schedule controllers can send the frequency signal pulse to source electrode driver 106, and source electrode driver 106 will receive the voltage data signal that time schedule controller 104 is transmitted.Source electrode driver 106 can make the liquid crystal capacitance 124 of a pixel cell 120 that is listed as be charged to the accurate position of voltage data signal by the output bias electric current, to show different GTGs.Because gate drivers 108 can connect a mode that is listed as with row and scan display panels 110, traditional picture sweep frequency (frame rate) is 60Hz.Source electrode driver 106 is designed to can be has different bias currents and fan-out capability, also can cancel, or enable special electricity-saving function, reclaims (charge recycling) as electric charge.See also Fig. 4, when Fig. 4 electric charge reclaims running, the variation synoptic diagram of pixel voltage.In Fig. 4, period a-d remarked pixel voltage is converted to the variation of positive polarity by negative polarity.Period a represents to utilize outside low-voltage electric capacity to be the data line charging earlier.Period b represents that the data line of output negative pole does electric charge with the data line of output cathode and share.Period c represents to use external high voltage electric capacity to charge as data line.Period d represents that the accurate position of source electrode driver 106 output cathode voltage data signals is to data line.Relatively, period e-h remarked pixel voltage is converted to the variation of negative polarity by positive polarity.Period e represents that the data line of positive polarity is charged to external high voltage electric capacity with voltage.Period f represents that the data line of positive polarity does electric charge with the data line of negative polarity and share.Period g represents to use external capacitive that data line voltage is dragged down again.Period h represents that the accurate position of source electrode driver 106 output negative pole voltage data signals is to data line.
In the present embodiment, enter battery saving mode after a period of time is left unused in system, then processing unit 101 can control picture sweep frequencies descend.For example reduce system's predominant frequency, or increase signal-free picture (blanking) time.Input interface 102 meetings this moment produce the one scan control signal and give time schedule controller 104, and time schedule controller 104 can be according to the frequency of scan control signal, produce a current controling signal, source electrode driver 106 promptly decides the bias current of output according to current controling signal.For instance, the normal pictures sweep frequency is 60Hz, and source electrode driver 106 is set the output first bias current I.The picture sweep frequency is reduced to 30Hz under battery saving mode, and input interface 102 produces the one scan control signals and makes source electrode driver 106 outputs second bias current 0.6 * I, and (or) start electricity-saving function such as electric charge recovery.When being returned to normal pictures sweep frequency 60Hz, input interface 102 notification source drivers 106 return back to the first bias current I, and the cancellation electric charge reclaims function.The bias plasma flow valuve of source electrode driver 106 outputs can be adjusted according to the picture sweep frequency, for example, when the picture sweep frequency is 60Hz, then setting source electrode driver 106 is the first bias current I, when the picture sweep frequency is 50Hz, then be set at second bias current, 0.6 * I,, then set the 3rd bias current 0.2 * I when the picture sweep frequency is 30Hz.
In one embodiment, input interface 102 is that (Low VoltageDifferential Signaling, LVDS) controller, this scan control signal are a low-voltage differential signal to a low-voltage differential signal.
In another embodiment, input interface 102 can directly produce a control signal and give source electrode driver 106, and does not need by the time schedule controller 104 direct bias current size exported of Controlling Source driver 106 just.
See also Fig. 3, Fig. 5 A and Fig. 5 B.Fig. 5 A and Fig. 5 B pixel are when the picture sweep frequency of 60Hz and 30Hz, and different bias currents are to the synoptic diagram of liquid crystal capacitance charging.In Fig. 5 A, display panels 110 is when normal pictures sweep frequency 60Hz, and the sweep interval that is to say each row pixel cell is 20us.If it is 2us that the bias current I of source electrode driver 106 output charges to the time that voltage data signal Vd spent to the liquid crystal capacitance of pixel cell, then remaining 18us then shows the demonstration time of corresponding GTG according to voltage data signal Vd for liquid crystal capacitance.In Fig. 5 B, when the picture sweep frequency is reduced to 30Hz, the sweep interval that is to say each row pixel cell is 40us.The bias current I of source electrode driver 106 output this moment charges to the time that voltage data signal Vd spends to the liquid crystal capacitance of pixel cell and still is 2us, and then the demonstration time of remaining 38us is obviously too tediously long.If being reduced to bias current 0.2 * I and starting electric charge, source electrode driver 106 reclaims function, though the duration of charging can be elongated, cause the demonstration time to shorten, but the demonstration time of liquid crystal capacitance too much influence can't visually be arranged, power consumption approximately can reduce by 40% on the contrary.See also Fig. 6, Fig. 6 is a traditional liquid crystal indicator and liquid crystal indicator of the present invention graph of a relation at different pictures sweep frequency and power.Can find that from Fig. 6 when the picture sweep frequency reduces 30Hz, reduce bias current simultaneously, power also can reduce 40%.That is to say that under power saving (low sweep frequency) pattern, display panels 100 of the present invention can be saved the power consumption that bias current produced of source electrode driver 106 outputs again.
See also Fig. 7 and Fig. 3, Fig. 7 is the method flow diagram that reduces liquid crystal indicator 100 power consumptions of the present invention.This method comprises following steps:
Step 600: select a picture sweep frequency.
Step 602: produce the one scan control signal according to this picture sweep frequency.
Step 604: according to this scan control signal frequency, do one relatively with oscillator, produce the control signal of a drive current, export first bias current or second bias current to set driver, enable or cancel special electricity-saving function, to be used for these a plurality of liquid crystal capacitances chargings.
See also Fig. 8, Fig. 8 is the calcspar of liquid crystal indicator second embodiment of the present invention.Liquid crystal indicator 200 comprises processing unit 201, input interface 202, time schedule controller (timingcontroller) 204, source electrode driver 106, gate drivers 108 and display panels 110.Processing unit 101 is used for controlling the running of liquid crystal indicator 200.Source electrode driver 106 be arranged on the flexible circuit board with gate driver 108 (Chip on film, COF), or be arranged on the glass substrate (Chip of glass, COG) again by flexible circuit board to be electrically connected with circuit board.Liquid crystal indicator 200 can be personal computer or mobile computer.Be simplified illustration, Fig. 7 and liquid crystal indicator shown in Figure 3, the identical person of element numbers wherein, its function is identical or similar, does not give unnecessary details in addition at this.Enter battery saving mode after a period of time is left unused in system, then processing unit 201 can control picture sweep frequencies descend.Input interface 202 meetings this moment produce the one scan control signal and give time schedule controller 204, and source electrode driver 106 can decide the bias current of output according to scan control signal.In the present embodiment, input interface 202 can be a low-voltage differential signal (scan control signal of its generation is a low-voltage differential signal for Low Voltage Differential Signaling, LVDS) controller.In another embodiment, scan control signal is one scan line frequency signal (YCLK).Time schedule controller 204 comprises controller 210 and oscillator 208.Oscillator 208 is used for producing a predeterminated frequency.The comparer 206 of controller 210 can compare the frequency of scan control signal and the predeterminated frequency that oscillator 208 produces.If the frequency of scan control signal is greater than this predeterminated frequency, then expression system is in normal mode, and at this moment, controller Controlling Source driver 106 is set at first bias current.Relatively, if the frequency of scan control signal is less than this predeterminated frequency, then expression system is in battery saving mode, this moment, controller 210 output current control signals were given source electrode driver 106, make source electrode driver 106 be set at second bias current, and enable the electricity-saving function that electric charge reclaims, wherein this first bias current is greater than this second bias current.
See also Fig. 8 and Fig. 9, Fig. 9 can reduce the method flow diagram of the power consumption of liquid crystal indicator for the present invention.This method comprises following steps:
Step 800: produce the one scan control signal.
Step 802 a: predeterminated frequency is provided.
Step 804: relatively whether the frequency of this scan control signal is greater than this predeterminated frequency, if carry out.
Step 806, if not, execution in step 808.
Step 806: when the frequency of this scan control signal greater than this predeterminated frequency, then source electrode driver is set at first bias current, and cancel special electricity-saving function (for example electric charge recovery function), provide higher fan-out capability to this display panels, to be used for to these a plurality of liquid crystal capacitances chargings.
Step 808: when the frequency of this scan control signal less than this predeterminated frequency, then produce a current controling signal and give source electrode driver, make source electrode driver be set at output second bias current, and enable special electricity-saving function, be set at lower fan-out capability to this display panels, being used for to this a plurality of liquid crystal capacitances charging, wherein this first bias current is greater than this second bias current.
In another embodiment, scan control signal is the picture sweep frequency of this display panels, also is that step 806 produces current controling signal according to this picture sweep frequency and this predeterminated frequency.
Compared to prior art, the invention provides and a kind ofly can dynamically adjust the bias current of source electrode driver and the liquid crystal indicator of type of drive.Source electrode driver can selectively be exported different bias currents and enable/cancel technology such as electric charge recovery according to different picture sweep frequencies, therefore reduces the display panels power consumption.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (14)
1. the liquid crystal indicator of a dynamic switch drive mode is characterized in that, comprises:
One display panels comprises a plurality of liquid crystal capacitances, is used for producing an image;
One input interface is used for producing the one scan control signal;
One oscillator is used for producing a predeterminated frequency;
One controller is electrically connected on this oscillator, is used for when the frequency of this scan control signal is lower than this predeterminated frequency, exports one first current controling signal; When the frequency of this scan control signal is higher than this predeterminated frequency, export one second current controling signal; And
One driver is electrically connected on this controller, is used for giving this display panels according to one first bias current or second bias current that this first current controling signal or the output of this second current controling signal are set, to enable or to cancel the battery saving mode of electric charge recovery.
2. liquid crystal indicator according to claim 1 is characterized in that other comprises time schedule controller, and wherein this oscillator and this controller are integrated among this time schedule controller.
3. liquid crystal indicator according to claim 1 is characterized in that this controller comprises a comparer.
4. liquid crystal indicator according to claim 1 is characterized in that, this driver is the one source pole driver.
5. liquid crystal indicator according to claim 1 is characterized in that, this scan control signal is the one scan line frequency signal, when the frequency of this scan control signal is lower than this predeterminated frequency, exports this first current controling signal.
6. liquid crystal indicator according to claim 1 is characterized in that, this input interface is a low-voltage differential signal controller, and this scan control signal is a low-voltage differential signal.
7. liquid crystal indicator according to claim 6 is characterized in that, this second bias current is greater than this first bias current.
8. method that can reduce the liquid crystal indicator power consumption, this liquid crystal indicator comprises a display panels, and this display panels comprises a plurality of liquid crystal capacitances, and this method comprises:
Select a picture sweep frequency;
Produce the one scan control signal according to this picture sweep frequency; And
Compare according to the frequency of this scan control signal and the predeterminated frequency of oscillator generation, when the frequency of this scan control signal during less than this predeterminated frequency, export one first bias current, export one second bias current when the frequency of this scan control signal during greater than this predeterminated frequency and give this display panels, to enable or to cancel the battery saving mode that electric charge reclaims.
9. method according to claim 8 is characterized in that, this scan control signal is a low-voltage differential signal.
10. method that can reduce the liquid crystal indicator power consumption, this liquid crystal indicator comprises a display panels, and this display panels comprises a plurality of liquid crystal capacitances, and this method comprises:
(a) produce the one scan control signal;
(b) provide a predeterminated frequency;
(c) frequency and this predeterminated frequency according to this scan control signal compares, when the frequency of this scan control signal greater than this predeterminated frequency, export one first current controling signal; When the frequency of this scan control signal less than this predeterminated frequency, export one second current controling signal; And
(d) export one first bias current according to this first current controling signal or this second current controling signal or one second bias current gives this display panels, to enable or to cancel the battery saving mode that electric charge reclaims.
11. method according to claim 10 is characterized in that, this first bias current is greater than this second bias current.
12. method according to claim 10 is characterized in that, comprises the picture sweep frequency that detects this display panels, and compares according to this picture sweep frequency and this predeterminated frequency.
13. method according to claim 12 is characterized in that, this scan control signal is the one scan line frequency signal.
14. method according to claim 12 is characterized in that, this scan control signal is a low-voltage differential signal.
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| CNB2007101953457A CN100559449C (en) | 2007-12-13 | 2007-12-13 | The method of the liquid crystal indicator of dynamic switch drive mode and reduction power consumption |
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| CNB2007101953457A CN100559449C (en) | 2007-12-13 | 2007-12-13 | The method of the liquid crystal indicator of dynamic switch drive mode and reduction power consumption |
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| CN102654990A (en) * | 2012-05-09 | 2012-09-05 | 深圳市华星光电技术有限公司 | Backlight module for changing oscillation frequency in stereo mode and liquid crystal display with backlight module |
| US9058781B2 (en) | 2012-05-09 | 2015-06-16 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Backlight unit with changing oscillation frequency in stereoscopic mode and liquid crystal display using the same |
| US10403224B2 (en) | 2016-08-10 | 2019-09-03 | Novatek Microelectronics Corp. | Control method and control device for charging time sharing |
| CN107068097A (en) * | 2017-05-12 | 2017-08-18 | 惠科股份有限公司 | Display device and its electricity saving method |
| TWI662538B (en) * | 2017-05-19 | 2019-06-11 | 友達光電股份有限公司 | Display apparatus and driving method thereof |
| CN108093135B (en) * | 2017-12-15 | 2019-08-30 | Oppo广东移动通信有限公司 | The anti-interference method and Related product of electronic equipment |
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