CN109036286A - The method for managing power supply and device of display screen and its pixel circuit unit - Google Patents
The method for managing power supply and device of display screen and its pixel circuit unit Download PDFInfo
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- CN109036286A CN109036286A CN201811095038.6A CN201811095038A CN109036286A CN 109036286 A CN109036286 A CN 109036286A CN 201811095038 A CN201811095038 A CN 201811095038A CN 109036286 A CN109036286 A CN 109036286A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Electroluminescent Light Sources (AREA)
- Control Of El Displays (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
本发明公开了一种显示屏及其像素电路单元的电源管理方法和装置，所述方法包括：调整像素电路单元的OLED器件阴极电压VELVSS，并实时检测所述像素电路单元的有机发光二极管OLED器件电流ID；根据ID处于稳定区间内的VELVSS的最大值，为所述像素电路单元的OLED器件阴极供电。应用本发明可以降低OLED器件的功耗，从而降低基于OLED器件的显示屏整体功耗。
The invention discloses a power management method and device for a display screen and a pixel circuit unit thereof. The method includes: adjusting the cathode voltage V ELVSS of an OLED device of the pixel circuit unit, and detecting the organic light-emitting diode (OLED) of the pixel circuit unit in real time Device current ID; according to the maximum value of V ELVSS where ID is in a stable range, power is supplied to the cathode of the OLED device of the pixel circuit unit. The application of the invention can reduce the power consumption of the OLED device, thereby reducing the overall power consumption of the display screen based on the OLED device.
Description
Technical field
The present invention relates to field of display technology, the power management side of a kind of display screen and its pixel circuit unit is particularly related to
Method and device.
Background technique
AMOLED (Active-matrix organic light-emitting diode, active matrix organic light-emitting two
Pole pipe) it is used as selfluminous element, it is provided simultaneously with fast response time, it is the advantages that color is true to nature and bent, positive at present to be widely applied
In display fields such as mobile phone, plate, TVs.
In pixel circuit unit currently based on the display screen of AMOLED, determine that the current formula of OLED device brightness is ID
=K (VELVDD-Vdata)2；Wherein K is DTFT (Driver Thin Film Transistor drives thin film transistor (TFT)) technique ginseng
Number, VELVDDIt exports for Power Management Unit to the voltage of the DTFT source electrode in pixel circuit unit, takes fixed value；VdataFor device
Dimming control voltage determines the specific brightness value under a certain grayscale.Due to the V of TFT between each pixelthBetween pixel caused by deviation
Brightness has differences, so, current pixel circuit unit uses compensation circuit structure, eliminates the V of multiple TFTthDifference is to picture
The influence of plain brightness.
However, available circuit has the shortcomings that power consumption is higher, the power consumption of OLED device need to be further decreased.
Summary of the invention
In view of this, it is an object of the invention to propose the method for managing power supply of a kind of display screen and its pixel circuit unit
And device, to reduce the power consumption of OLED device, to reduce the display screen overall power based on OLED device.
A kind of method for managing power supply of pixel circuit unit is provided based on the above-mentioned purpose present invention, comprising:
Adjust Organic Light Emitting Diode OLED device cathode voltage VELVSS, and pixel circuit unit described in real-time detection has
Machine light-emitting OLED device electric current ID；
According to IDV in stable regionELVSSMaximum value, for the machine light-emitting OLED device cathode supply
Electricity.
Wherein, the adjustment Organic Light Emitting Diode OLED device cathode voltage VELVSS, it specifically includes:
Voltage value is set as V with oneELVSSInitial value, increase V in primary adjustment to set step-lengthELVSSValue.
Wherein, the IDV in stable regionELVSSMaximum value be determining according to the following method:
By the I of current detectionDWith target current ID' value be compared；
If the two difference exceeds threshold value, I is judgedDIt has been not in stable region, V when last time is adjustedELVSSValue
As the IDV in stable regionELVSSMaximum value；
Wherein, target current value is the voltage V according to the DTFT source electrode of the pixel circuit unitELVDDWith device brightness control
Voltage V processeddataIt calculates.
The present invention also provides a kind of electric power controllers of pixel circuit unit, comprising:
Current detecting unit, the OLED device electric current I of real-time detection pixel circuit unitD；
Electric current stable region judging unit, for judging the I of detectionDWhether in stable region, and export judgement knot
Fruit；
Power supply output control unit, for adjusting the OLED device cathode voltage V of the pixel circuit unitELVSS, and
According to the judging result, I is determinedDV in stable regionELVSSMaximum value after, be institute according to determining maximum value
State the OLED device cathode power supply of pixel circuit unit.
Wherein, the power supply output control unit specifically includes:
Subelement is adjusted, for adjusting the Organic Light Emitting Diode OLED device cathode voltage VELVSSValue；
Power supply subelement, for the V according to adjustment subelement adjustmentELVSSValue be the pixel circuit unit
The power supply of OLED device cathode；And according to the judging result, determine IDV in stable regionELVSSMaximum value
It afterwards, is that OLED device cathode is powered in the pixel circuit unit according to determining maximum value.
Wherein, the electric current stable region judging unit specifically includes:
The preset subelement of electric current is used for preset target electric current ID′；Wherein, target current ID' value be according to the pixel
The DTFT source voltage V of circuit unitELVDDVoltage V is controlled with device brightnessdataIt calculates；
Judgment sub-unit, for by the I of real-time detectionDWith target current value ID' be compared；If the two difference exceeds threshold
Value, then export IDIt is not at the judging result of stable region.
Preferably, the judgment sub-unit is specially comparator；And
Two inputs of the comparator are respectively connected to the OLED device electric current I of the current detecting unit outputDAnd electricity
Flow the preset I of preset subelementD′；The output of the comparator is fed back to the power supply output control unit.
The present invention also provides a kind of display screens, comprising: pixel circuit unit, and further include: above-mentioned pixel electricity
The electric power controller of road unit.
In main technical schemes of the invention, the Organic Light Emitting Diode OLED device cathode electricity of pixel circuit unit is adjusted
Press VELVSS, and the OLED device electric current I of real-time detection pixel circuit unitD；According to IDV in stable regionELVSSMost
Big value is that the OLED device cathode of the pixel circuit unit is powered.In this way, the I in stable regionDIt can guarantee pixel
The brightness of the OLED device of circuit unit, meanwhile, IDMaximum V in stable regionELVSSOLED device can be effectively reduced
Part power consumption, to reduce the display screen overall power based on OLED device.
Detailed description of the invention
Fig. 1 is the drain current I of DTFT in the pixel circuit unit of the prior artDWith drain-source voltage VDSChange curve
Figure；
Fig. 2 a is the circuit diagram that DTFT drives OLED device in the pixel circuit unit of the prior art；
Fig. 2 b is a kind of method for managing power supply flow chart of pixel circuit unit provided in an embodiment of the present invention；
Fig. 3 is a kind of electric power controller internal structure block diagram of pixel circuit unit provided in an embodiment of the present invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in more detail.
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and for explaining only the invention, and is not construed as limiting the claims.
Those skilled in the art of the present technique are appreciated that unless expressly stated, singular " one " used herein, " one
It is a ", " described " and "the" may also comprise plural form.It is to be further understood that when we claim element to be " connected " or " coupling
Connect " to another element when, it can be directly connected or coupled to other elements, or there may also be intermediary elements.In addition, this
In " connection " or " coupling " that uses may include being wirelessly connected or wireless coupling.Wording "and/or" used herein includes one
A or more associated whole for listing item or any cell and all combination.
It should be noted that all statements for using " first " and " second " are for differentiation two in the embodiment of the present invention
The non-equal entity of a same names or non-equal parameter, it is seen that " first " " second " only for the convenience of statement, does not answer
It is interpreted as the restriction to the embodiment of the present invention, subsequent embodiment no longer illustrates this one by one.
The present inventor carries out analysis to existing pixel circuit unit and finds, the drain electrode of DTFT in pixel circuit unit
Electric current IDWith drain-source voltage VDSChange curve it is as shown in Figure 1.Usually determine DTFT (the driving crystal of OLED device electric current
Pipe) constant current area of the work in saturation zone state, that is, Fig. 1, I at this timeDClose to a certain stationary value, when in a kind of constant brightness
Under, i.e., a certain VdataUnder value, and the gate source voltage V of DTFTGSWhen for a certain fixed value, if the DTFT in saturation region does not consider ditch
Road width mudulation effect, the electric current I of OLED deviceDValue and the DTFT source-drain voltage V for determining device currentDSIt is unrelated.Such as Fig. 2 a institute
In the circuit shown, the power calculation of OLED device consumption is Poled=(VELVDD-VELVSS)×ID.Wherein, VELVSSFor power management
Unit is exported to the Organic Light Emitting Diode OLED device cathode voltage of pixel circuit unit, VELVDDFor Power Management Unit output
To the source voltage of DTFT.The present inventor increases V it is considered that taking as a result,ELVSSThe method of voltage value can effectively drop
Low OLED device power consumption.
Based on above-mentioned analysis, main thought of the invention is the Organic Light Emitting Diode OLED for adjusting pixel circuit unit
Device cathodes voltage VELVSS, and the OLED device electric current I of real-time detection pixel circuit unitD；According to IDIn stable region
VELVSSMaximum value, be the pixel circuit unit OLED device cathode power.In this way, the I in stable regionDIt can
To guarantee the brightness of OLED device, meanwhile, maximum VELVSSOLED device power consumption can be effectively reduced, be based on OLED to reduce
The display screen overall power of device.
The technical solution for embodiment that the invention will now be described in detail with reference to the accompanying drawings.
Power supply based on pixel circuit unit in above-mentioned analysis and thinking a kind of display screen provided in an embodiment of the present invention
Management method, process is as shown in Figure 2 b, includes the following steps:
Step S201: the Organic Light Emitting Diode OLED device cathode voltage V of pixel circuit unit of adjustmentELVSS。
Specifically, OLED device cathode voltage V can be provided for pixel circuit unit all in display screenELVSS, and with
One sets voltage value as VELVSSInitial value, in VELVSSIt is primary adjustment during with set step-length increase VELVSSValue；Also
It is to say, it, will be in last V when executing this step every time on the basis of a setting voltage valueELVSSValue on the basis of increase and set
Fixed step size obtains this V adjustedELVSSValue.And above-mentioned setting voltage value can be a lesser voltage value, by this
Field technical staff is rule of thumb arranged.
Step S202: the OLED device electric current I of detection pixel circuit unitD。
Specifically, it can detecte the OLED device electric current I of any pixel circuit unit in display screenD。
Step S203: judge the I of current detectionDWhether stable region is in；Continue to adjust if so, jumping to step S201
Whole VELVSSValue；Otherwise, judge IDIt has been not at stable region, has executed following steps S204.
It specifically, can be by the I of current detectionDValue and target current ID' value be compared；
If the two difference exceeds threshold value, I is judgedDIt has been not at stable region, then had executed following steps S204 for last time
V when adjustmentELVSSValue as IDV in stable regionELVSSMaximum value；
Otherwise, judge IDStill in stable region, VELVSSAlso there is the space improved, then jump to above-mentioned steps S201,
Continue to further increase VELVSSAdjustment attempt.
Above-mentioned target current ID' value can be the DTFT source voltage V according to pixel circuit unitELVDDIt is bright with device
Degree control voltage VdataIt precalculates: ID'=K (VELVDD-Vdata)2；Wherein, K is the TFT technique of pixel circuit unit
Parameter.
Above-mentioned threshold value can be rule of thumb arranged, for example, according to the change curve of such as Fig. 1 it may determine that I outDStabilization
The range in section, so that a reasonable threshold value be arranged according to this.
Step S204: according to IDV in stable regionELVSSMaximum value, be pixel circuit unit OLED device
Cathode power supply.
Specifically, for VELVSSThe adjustment of value be the case where incrementally increasing, then by IDIt is last in stable region
The V once adjustedELVSSValue, i.e., last time adjust when VELVSSValue, as IDV in stable regionELVSSMaximum
Value；Later, according to IDV in stable regionELVSSMaximum value, be the OLED of all pixel circuit unit in display screen
Device cathodes power supply.In this way, even if the OLED device cathode of pixel circuit unit is increased, due to ensure that IDIn stable region
In, therefore can guarantee the brightness of OLED device, meanwhile, higher OLED device cathode voltage VELVSSOLED can be effectively reduced again
Device power consumption.
Based on above-mentioned method, one kind provided in an embodiment of the present invention is set in display screen, is the pixel electricity of display screen
Road unit provides the electric power controller of power supply, and internal structure is as shown in Figure 3, comprising: current detecting unit 301, electric current are stablized
Interval judgement unit 302, power supply output control unit 303, electric current preset unit 304.
Wherein, the OLED device electric current I of 301 real-time detection pixel circuit unit of current detecting unitD；Specifically, electric current
Detection unit 301 can be with the OLED device electric current I of some pixel circuit unit in real-time detection display screenD。
Electric current stable region judging unit 302 is used to judge the I of detectionDWhether in stable region, and export judgement
As a result.It specifically, can be by the I of 301 real-time detection of current detecting unitDWith preset target current ID' be compared；If two
Person's difference exceeds threshold value, then exports IDIt is not at the judging result of stable region.Electric current stable region judging unit 302 as a result,
It may include: the preset subelement 321 of electric current, judgment sub-unit 322.
Wherein, the preset subelement 321 of electric current is used for preset target electric current ID′；Wherein, the value of target current is according to
The DTFT source voltage V of pixel circuit unitELVDDVoltage V is controlled with device brightnessdataIt precalculates: ID'=K (VELVDD-
Vdata)2；Wherein, K is the TFT technological parameter of pixel circuit unit.
Judgment sub-unit 322 is used for the I for detecting current detecting unit 301DThe preset mesh with the preset subelement 321 of electric current
Mark electric current ID' be compared；If the two difference exceeds threshold value, I is exportedDIt is not at the judging result of stable region.
In fact, the function of judgment sub-unit 322 can be realized by single-chip microcontroller or processor, it can also be by more simple
Single device --- comparator is realized.I.e. above-mentioned judgment sub-unit 322 specifically can be comparator；Wherein, comparator
Two inputs are respectively connected to the OLED device electric current I that the current detecting unit 301 exportsDIt is pre- with the preset subelement 321 of electric current
The I setD′；Comparator can export the I of real-time detectionDWith target current value ID' comparison result；The output of comparator can be anti-
It is fed to power supply output control unit 303.
Power supply output control unit 303 is used to adjust the OLED device cathode voltage V of pixel circuit unitELVSS, Yi Jigen
According to the judging result that electric current stable region judging unit 302 exports, I is determinedDV in stable regionELVSSMaximum value
Afterwards, it is powered according to the OLED device cathode that determining maximum value is pixel circuit unit.
Further, the DTFT source voltage V of the also exportable pixel circuit unit of power supply output control unit 303ELVDD, and
Device brightness controls voltage Vdata。
Specifically, above-mentioned power supply output control unit 303 may include: adjustment subelement 311, power supply subelement
312。
Wherein, adjustment subelement 311 is used to adjust the OLED device cathode voltage V of the pixel circuit unitELVSS；Specifically
Ground adjusts subelement 311 with one and sets voltage value as VELVSSInitial value, every time adjustment when with set step-length increase VELVSS's
Value, and to the V of 312 output adjustment of power supply subelementELVSSValue.
The V of adjustment of the power supply subelement 312 for being exported during adjustment according to adjustment subelement 311ELVSSValue
It powers for the OLED device cathode of pixel circuit unit pixel circuit unit each in display screen；And according to electric current stable region
The judging result that judging unit 302 exports, determines IDThe V that subelement 311 is adjusted to is adjusted in stable regionELVSS's
After maximum value, exiting adjustment period enters the stable power-supplying phase；In the stable power-supplying phase then according to determining IDIn stable region
VELVSSMaximum value be display screen in each pixel circuit unit OLED device cathode power supply.Power supply subelement 312 has
Body is used for the I exported according to the electric current stable region judging unitDIt is not at the judging result of stable region, will be adjusted last time
When VELVSSValue be determined as maximum value after, according to determining maximum value be display screen in each pixel circuit unit pixel circuit list
The OLED device cathode power supply of member.
Further, the DTFT source voltage V of the also exportable pixel circuit unit of power supply subelement 312ELVDD, Yi Jiqi
Part dimming control voltage Vdata。
In main technical schemes of the invention, the OLED device cathode voltage V of pixel circuit unit is adjustedELVSS, and in real time
The OLED device electric current I of detection pixel circuit unitD；According to IDV in stable regionELVSSMaximum value, be the picture
The OLED device cathode of plain circuit unit is powered.In this way, the I in stable regionDIt can guarantee pixel circuit unit
The brightness of OLED device, meanwhile, IDMaximum V in stable regionELVSSOLED device power consumption can be effectively reduced, thus
Reduce the display screen overall power based on OLED device.
Those skilled in the art of the present technique are appreciated that the present invention includes being related to for executing in operation described herein
One or more equipment.These equipment can specially design and manufacture for required purpose, or also may include general
Known device in computer.These equipment have the computer program being stored in it, these computer programs are selectively
Activation or reconstruct.Such computer program can be stored in equipment (for example, computer) readable medium or be stored in
It e-command and is coupled in any kind of medium of bus respectively suitable for storage, the computer-readable medium includes but not
Be limited to any kind of disk (including floppy disk, hard disk, CD, CD-ROM and magneto-optic disk), ROM (Read-Only Memory, only
Read memory), RAM (Random Access Memory, immediately memory), EPROM (Erasable Programmable
Read-Only Memory, Erarable Programmable Read only Memory), EEPROM (Electrically Erasable
Programmable Read-Only Memory, Electrically Erasable Programmable Read-Only Memory), flash memory, magnetic card or light card
Piece.It is, readable medium includes by equipment (for example, computer) with any Jie for the form storage or transmission information that can be read
Matter.
Those skilled in the art of the present technique be appreciated that can be realized with computer program instructions these structure charts and/or
The combination of each frame and these structure charts and/or the frame in block diagram and/or flow graph in block diagram and/or flow graph.This technology neck
Field technique personnel be appreciated that these computer program instructions can be supplied to general purpose computer, special purpose computer or other
The processor of programmable data processing method is realized, to pass through the processing of computer or other programmable data processing methods
The scheme specified in frame or multiple frames of the device to execute structure chart and/or block diagram and/or flow graph disclosed by the invention.
Those skilled in the art of the present technique have been appreciated that in the present invention the various operations crossed by discussion, method, in process
Steps, measures, and schemes can be replaced, changed, combined or be deleted.Further, each with having been crossed by discussion in the present invention
Kind of operation, method, other steps, measures, and schemes in process may also be alternated, changed, rearranged, decomposed, combined or deleted.
Further, in the prior art to have and the step in various operations, method disclosed in the present invention, process, measure, scheme
It may also be alternated, changed, rearranged, decomposed, combined or deleted.
It should be understood by those ordinary skilled in the art that: the discussion of any of the above embodiment is exemplary only, not
It is intended to imply that the scope of the present disclosure (including claim) is limited to these examples；Under thinking of the invention, above embodiments
Or can also be combined between the technical characteristic in different embodiments, step can be realized with random order, and be existed such as
Many other variations of the upper different aspect of the invention, for simplicity, they are not provided in details.Therefore, it is all
Within the spirit and principles in the present invention, any omission, modification, equivalent replacement, improvement for being made etc. be should be included in of the invention
Within protection scope.
Claims (10)
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Cited By (5)
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| CN110767170A (en) * | 2019-11-05 | 2020-02-07 | 深圳市华星光电半导体显示技术有限公司 | Picture display method and picture display device |
| CN111341268A (en) * | 2020-04-13 | 2020-06-26 | 京东方科技集团股份有限公司 | Display driving circuit, display driving method and device |
| CN112086067A (en) * | 2019-06-14 | 2020-12-15 | 华为技术有限公司 | A voltage adjustment method and electronic device |
| WO2021232225A1 (en) * | 2020-05-19 | 2021-11-25 | 京东方科技集团股份有限公司 | Power supply management apparatus and display device |
| CN113781943A (en) * | 2021-08-06 | 2021-12-10 | 武汉天马微电子有限公司 | Display substrate, display panel, display device and voltage adjusting method |
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Application publication date: 20181218 |