CN104332151B - Display device, display device circuit and method for operating display device - Google Patents
Display device, display device circuit and method for operating display device Download PDFInfo
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- CN104332151B CN104332151B CN201410599375.4A CN201410599375A CN104332151B CN 104332151 B CN104332151 B CN 104332151B CN 201410599375 A CN201410599375 A CN 201410599375A CN 104332151 B CN104332151 B CN 104332151B
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- 238000005259 measurement Methods 0.000 description 11
- 230000008859 change Effects 0.000 description 7
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- 101100408453 Arabidopsis thaliana PLC5 gene Proteins 0.000 description 5
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- 102100026205 1-phosphatidylinositol 4,5-bisphosphate phosphodiesterase gamma-1 Human genes 0.000 description 4
- 101100190617 Arabidopsis thaliana PLC2 gene Proteins 0.000 description 4
- 101100190621 Arabidopsis thaliana PLC4 gene Proteins 0.000 description 4
- 101100408456 Arabidopsis thaliana PLC8 gene Proteins 0.000 description 4
- 101100464304 Caenorhabditis elegans plk-3 gene Proteins 0.000 description 4
- 101000691599 Homo sapiens 1-phosphatidylinositol 4,5-bisphosphate phosphodiesterase gamma-1 Proteins 0.000 description 4
- 101100093534 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) RPS1B gene Proteins 0.000 description 4
- 101100190618 Arabidopsis thaliana PLC3 gene Proteins 0.000 description 3
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- 230000002035 prolonged effect Effects 0.000 description 2
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- 101100315945 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) UBS1 gene Proteins 0.000 description 1
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- 239000011230 binding agent Substances 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
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- 230000003068 static effect Effects 0.000 description 1
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Abstract
The invention discloses a display device which can have display device pixel arrays used for image display. A digital-to-analog converter can be used for receiving digital display data. The digital-to-analog converter can convert the digital display data into analog display data used as display device pixels. Control signals such as reference voltages received by the digital-to-analog converter can be used for controlling the magnitudes of analog display data signals provided by the digital-to-analog converter to the display device pixels. A brightness control can be provided with a plurality of peak brightness control characteristic patterns. A lookup table is used for processing brightness arrangement and therefore information for identifying one peak brightness control characteristic pattern chosen from the peak brightness control characteristic patterns can be generated. The brightness controller can be used for generating the reference voltage used for controlling the digital-to-analog controller through use of the peak brightness control characteristic pattern and an average frame brightness, wherein the peak brightness control characteristic pattern is chosen according to the digital display data.
Description
U.S. Patent application 14 ,/329,197 that patent application claims were submitted on July 11st, 2014 and in 2013
The priority of the temporary patent application 61/900,890 that on November 6, in submits to, the patent application is incorporated by reference accordingly
It is expressly incorporated herein.
Background technology
Present invention relates generally to electronic equipment, and relate more specifically to the electronic equipment with display.
Electronic equipment generally often includes display.The overall brightness level of multiple display is adjustable.For example, show
Device can have the brightness that can be manually increased by user or be reduced to arrange.Display can also have in response to ambient light measurement
And the brightness for automatically adjusting is arranged.Controlled using such auto brightness level, can be certainly when environmental lighting conditions brighten
It is dynamic to make display brighter to assist in ensuring that display keeps visible to user.
In order to ensure display does not consume excessive power and helps improve display life, electronic equipment is frequently used peak value
Brilliance control algorithm (sometimes referred to as automatic current limiting).
When peak brightness control function is enabled, the content for no matter when just showing presents the average frame luminance of big value,
It is reduced by the peak brightness of shown image.The magnitude of current is which ensure that, therefore the quantity of power that display is drawn is limited.
In addition to limiting power consumption, this also assists in the temperature limited in display and rises, so as to the display in prolonged display
The life-span of pixel.
When the mean flow rate of the frame of view data is low, it is allowed to which display carrys out display content with big peak brightness.At this
In the case of kind, the display with the several icons in sparse content such as black background can brightly show the content.
Arrange with adjustable display brightness and while setting with the peak brightness control algolithm for activating when using
When standby, challenge is occurred in that.For example, it is average when detecting under dim illumination condition or in the case of brightness arranges low other
Brightness can further be reduced using peak brightness control algolithm during the high Frame of brightness, this may excessively reduce brightness and cause
It is difficult or impossible to the content checked on display.
It is desirable to the improvement side of a kind of brightness setting in processing display and peak brightness control operation can be provided
Formula.
The content of the invention
Electronic equipment may include the display with display pixel array.Display pixel array may include to show for user
The row and column of the organic light emitting diode display pixel of diagram picture.
Digital Image Data can be provided to digital to analog converter.Digital displaying data can be converted to offer by digital to analog converter
The analog information data of the display picture element row into array.The benchmark that such as can be received by analog-digital converter by control signal
Voltage is controlling the value of the analog information data signal that digital to analog converter is provided to display picture element.
Brightness controller can keep multiple peak brightness controlling feature figures, each characteristic pattern to correspond to a corresponding peak value
Brilliance control algorithm.Peak brightness controlling feature figure can be used to subtract in the case of the mean flow rate height of the frame of digital displaying data
The value (therefore reducing the value and display brightness for showing signal) of little reference voltage, so as to save power and prolonged display picture
The life-span of element.Each peak brightness controlling feature figure can be optimized and arranged for different brightness.
User can provide display brightness and arrange using input/output unit for electronic equipment.Electronic equipment can also be based on
Ambient light sensor reading come obtain brightness arrange.Can be processed by circuit such as look-up table user offer or based on sensor
Display brightness arrange.Look-up table can have output, and the output provides information such as characteristic pattern numbering or other identifiers, should
Other identifiers recognize the selected peak brightness the peak brightness controlling feature figure suitable for giving brightness setting
Controlling feature figure.It is that the selected peak brightness controlling feature figure of Digital Image Data and average frame are bright that brightness controller can be used
Angle value controls the reference voltage of Mathematical model control device to produce.
Description of the drawings
Fig. 1 is the diagram of the example electronic device with display according to one embodiment.
Fig. 2 is the diagram of the example electronic device according to one embodiment.
Fig. 3 is illustrated according to one embodiment for different display operation conditions, the amount of analog information data signal
The diagram how value changes with the function of digital data value (gray level).
Fig. 4 is the multiple peak brightnesss depicted for different respective display brightness settings according to one embodiment
The diagram of controlling feature figure.
How Fig. 5 can select be used to control display according to one embodiment using brightness setting if being showed
The diagram of which the peak brightness controlling feature figure in multiple peak brightness controlling feature figures of Fig. 4.
Fig. 6 is the diagram for being related to the control circuit of display image over the display according to one embodiment.
Fig. 7 is the circuit diagram of the exemplary display with calibration circuit according to an embodiment of the invention.
Fig. 8 is the flow chart of the illustrative steps for being related to operate the calibration circuit of Fig. 7 according to one embodiment.
Specific embodiment
Fig. 1 shows the example electronic device of the type can with organic light emitting diode display.As shown in figure 1,
Electronic equipment 10 can have control circuit 16.Control circuit 16 may include the storage for the operation of holding equipment 10 and process electricity
Road.Storage and process circuit may include storage device such as hard disk drive storage devices, nonvolatile memory (for example, quilt
Be configured to form the flash memories of solid-state drive or other EPROMs), volatile memory (for example,
Either statically or dynamically random access memory), etc..Process circuit in control circuit 16 can be used for the operation of control device 10.
Process circuit can be based on one or more microprocessors, microcontroller, digital signal processor, baseband processor, power management
Unit, audio coding decoding chip, special IC etc..Runs software on device 10 can be carried out using control circuit 16, such as
Operating system code and application program.
Input-output circuit in equipment 10 such as input/output unit 12 can be used to allow to provide data to equipment
10 and allow data from device 10 is provided to external equipment.Input/output unit 12 may include button, stick, click wheel,
Roller, Trackpad, keypad, keyboard, mike, speaker, audio-frequency generator, vibrator, camera, sensor (for example,
Or multiple ambient light sensors), light emitting diode and other positioning indicators, FPDP, and other input-output units
15.User can provide order come the operation of control device 10 by input/output unit 12, and can be set using input-output
Standby 12 output resource is come from the receiving status information of equipment 10 and other outputs.
Input/output unit 12 may include one or more display such as display 14.Display 14 can be touched
Panel type display, the touch-screen display includes touch sensor for adopting from user or to touching insensitive display 14
Collection touch input.Touch sensor for display 14 can be based on capacitive touch sensor electrode, acoustic touch sensor
Structure, resistive touch part, based on the touch sensor arrangement of power, the touch sensor based on light or other appropriate touches
The array of transducer arrangements.Display 14 can have form display control circuit 8 (for example, timing controller integrated circuit, grid
Driver circuit, column driver circuit etc.) one or more integrated circuits.Display control circuit 8 can be used for display
Display picture element row in device pel array 6 provide data signal D.Display control circuit 8 may also provide for display
The control signal (sometimes referred to as gate line signal or scanning signal) that display picture element row in pel array 6 is addressed.When
On display 14 during the frame of video data, display control circuit 8 can for example be to display picture element on corresponding data line
While each column in array 6 provides analog data signal D, the grid in often going in display pixel array 6 is asserted in succession
Line signal.Display pixel array 6 may include organic light emitting diode display pixel, the display based on LCD Technology
Device pixel or the display picture element formed using other display technologies.Herein is sometimes organic light emission by display 14
The configuration of diode display is described as example.This is only exemplary.Display 14 can be the aobvious of any appropriate type
Show device.
As shown in the schematic diagram of Fig. 2, display 14 can have the rectangular array of display picture element 22 for showing for user
Diagram picture.The array of display picture element 22 (for example, can be formed by display picture element structure by the such as substrate 24 of the structure on display layer
Display picture element) row and column formed.There can be any an appropriate number of row and column in the array of display picture element 22 (for example,
Ten or more, 100 or more or 1,000 or more).
Display control circuit 8 (for example, display driving circuit) can such as be shown using solder or electroconductive binder
Driver IC 28 is couple to the metal trace on conductive path such as substrate 24.Display-driver Ics 28 (have
When be referred to as timing controller chip) telecommunication circuit that may include for being communicated with system, control circuit by path 26.
Path 26 can be formed by the trace on flexible print circuit or other cables.System, control circuit may include microprocessor, special
In integrated circuit and other resources and the main logic board in can be located at the electronic equipment that display 14 is being used.In the operation phase
Between, the control circuit (for example, the control circuit 16 of Fig. 1) on logic card can be the such as display driver of display control circuit 8
Integrated circuit 28 provides the information of the relevant image to show on display 14.
For the display image on display picture element 22, display-driver Ics 28 can provide correspondence to data wire D
Simulated image data, while to display driving circuit such as gate driver circuit 18 and demultiplexing and row driver electricity
Road 20 sends clock signal and other control signals.
Gate driver circuit 18 (sometimes referred to as scan line driver circuit) can be formed on substrate 24 (for example, aobvious
Show on the left hand edge and right hand edge of device 14, only on the single edge of display 14, or the other places in display 14).Can make
To be demultiplexed on multiple corresponding data wire D from the data signal of display-driver Ics 28 with circuit 20.Utilize
The exemplary arrangement of Fig. 2, data wire D extends perpendicular through display 14.Per data line D all with the phase of display picture element 22
Should arrange associated.Gate lines G (sometimes referred to as scan line) level is extended by display 14.Every gate lines G all with display
The corresponding line of device pixel 22 is associated.If desired, there may be the often row phase of a plurality of gate line (scan line) and display picture element
Association.Gate driver circuit 18 can be located at the left side of display 14, the right side of display 14 or the left side and the right side of display 14
Side, as shown in Figure 2.
Gate driver circuit 18 can assert that the signal in the gate lines G in display 14 (sometimes referred to as scans letter
Number).For example, gate driver circuit 18 can receive clock signal and other control signals from display-driver Ics 28,
And received signal is may be in response to, from the beginning of the gate line signal G in the first row display picture element 22, gate line is asserted successively
Signal on G.When every gate line is asserted, by from the corresponding row of the data locking of data wire D to display picture element
In.In this way, the display control circuit 28,20,18 and other display control circuits 8 in equipment 10 can be display
Device pixel 22 provides indication display pixel 22 and produces signal of the light for target image on display 14.
During the operation of equipment 10, run on the software in control circuit 16 can be by carrying to display control circuit 8
Carry out display image on display 14 for digital displaying data.Digital Image Data can be shown by display control circuit 8
In frame in display pixel array 6.Each frame of data may include and the display picture element 22 in display pixel array 6
The corresponding data bit of row and column row and column.
Each position of view data can have one of some possible number values.For example, each position can represent and have from G0
(for black picture element) arrives the digital level of one of 256 gray-scale values of G255 (for white pixel) scope (sometimes referred to as
Digital grayscale).Position with intermediate value may correspond to gray pixels output.It is (such as red using the colour element in array 6
Color, green and blue-display pixel) to provide the ability for showing coloured image for display 14.
Digital to analog converter, sometimes referred to as γ reference blocks, can be used to be converted to digital displaying data (for example, gray-scale value)
Analog information data D (for example, corresponding to the voltage signal for expecting brightness value).Fig. 3 is showed for two kinds of different digital-to-analogues
Converters operation condition, digital displaying data (i.e. gray level) and analog information data (are driven on the data wire D of Fig. 2
Analog data signal) between exemplary relation diagram.The curve of Fig. 3 shows digital displaying data and analog information data
Relation between D, and sometimes referred to as gamma curve.
During the operation of display 14, digital displaying data (gray-scale data) is received as the input of γ reference blocks,
And corresponding analog information data D are provided as output.The control signal that control signal sometimes referred to as may act as γ reference blocks is defeated
Reference voltage V ref for entering.The value of signal Vref controls the data produced as the function of the gray level input of γ reference blocks
The size of signal D.For example, if Vref is set to into the value of Vref1, output data D will comply with gamma curve GC1.If will
Vref is set to the value of Vref2, then output data D will comply with gamma curve GC2.In this example, curve GC2 be less than curve
Output valve D of GC2 is associated, therefore when according to curve GC2 rather than curve GC1 to drive its display picture element, display 14
Lower light output and less high-high brightness will be presented.
Can by brightness controller be dynamically determined given point in time be applied to digital to analog converter Vref value.Can use
Special intednsity circuit come implement brightness controller and/or using control circuit resource such as microprocessor and memorizer come
Implement brilliance control algorithm.Brightness controller can receive the first input such as average frame luminance input or with will be in display picture element
The other information of the numerical data brightness correlation shown on array 6, and the second input such as peak brightness controlling feature can be received
Figure numbering or recognize will using any bar peak brightness controlling feature figure come the video data in display pixel array 6 other are defeated
Enter.
During operation, brightness controller can select the appropriate peak brightness control to be used in response to the second input
Characteristic pattern processed.It is input into based on first and based on selected peak brightness controlling feature figure, brightness controller can be produced is used for
The value of the Vref of modulus controller (i.e. γ reference blocks).
Fig. 4 shows the diagram of the exemplary peak brilliance control characteristic pattern that can be used by brightness controller：PLC1、
PLC2, PLC3, PLC4 and PLC5.Generally, any an appropriate number of peak brightness controlling feature figure can is to use display control
Circuit processed 8 is implementing.The example scenario of Fig. 4 is directed to use with five characteristic patterns.Each peak brightness controlling feature can be optimized
Figure is operated with arranging with reference to different corresponding brights.
Display control circuit 8 can be manually entered and/or can be based on from user's reception is related to desired brightness setting
The ambient light measurement obtained using ambient light sensor is arranged for display 14 to automatically determine using which kind of brightness.For example,
User can provide desired user's brightness and arrange using touch screen or other input-output units 15 to equipment 10.Can also
The current environment illumination condition for equipment 10 and display 14 is determined using the reading from ambient light sensor.In environment
In the case that illumination is bright, equipment 10 can automatically select high brightness and arrange so that image can be visible on display 14.
In the case where ambient lighting is dark, equipment 10 can automatically select low brightness and arrange.Manual and/or automatic control program
Combination can also be used for selecting desired display brightness to arrange (sometimes referred to as user's brightness is arranged).
In conventional display, when the frame of high average frame luminance is shown, even if brightness arranges very dark, peak value is bright
Degree control algolithm can also make display grow dark.Both are arranged by peak brightness control algolithm and dark brightness to enter display
The light modulation of row combination type can make display excessively dimmed.
Brightness controller in display control circuit 8 arranges to be preferably chosen the peak brightness to be used based on brightness
Controlling feature figure.For example, under the conditions of bright light photograph (that is, brightness arranges high situation), peak brightness controlling feature can be used
Figure such as Fig. 4 characteristic pattern PLC1 (that is, dim quite actively under the brightness value for improving because under high brightness facilities,
The risk of excessively light modulation is low).Under dim illumination condition (that is, in the case where user's brightness setting is low), can be bright using peak value
Degree controlling feature figure such as Fig. 4 characteristic pattern PLC5 (that is, characteristic pattern less aggressively is dimmed under the average brightness value for improving,
To avoid excessively light modulation).(that is, when expecting that corresponding medium user brightness is arranged), peak can used under the conditions of intermediate light is shone
Value brilliance control characteristic pattern such as characteristic pattern PLC2, PLC3 and PLC4.
For example consider characteristic pattern PLC5.When ambient lighting is dark, it is desirable to which restriction is implemented by peak brightness controlling feature figure
Display picture element brightness reduce amount, so as to avoid making display excessively dimmed.As shown in the shape of characteristic pattern PLC5, this leads to
Cross and the Vref value of high (reduction) is maintained under the average frame luminance AL of relatively high value and is realized.When ambient light illumination is dark, can
Using the characteristic pattern being more suitable for such as one of characteristic pattern PLC1, PLC2, PLC3 or PLC4.The example feature diagram shape of Fig. 4 has
Help the unexpected brightness increase for avoiding declining and otherwise occurring in response to the average frame luminance of numerical data.
Fig. 5 shows and can be used to user's brightness is arranged (for example, from 0 to 210Scope or the numeral with other appropriate values
Brightness is arranged) it is mapped to the exemplary of peak brightness controlling feature figure (for example, the characteristic pattern PLC1 ... PLC5 in this example)
Curve.The curve of Fig. 5 can be realized using circuit such as look-up table, the circuit receives brightness and is provided as being input into and producing peak value
It is right that brilliance control feature graph identifier such as characteristic pattern numbering or identification will be provided as the brightness using which bar characteristic pattern
The other information that should be exported.
Fig. 6 is the schematic diagram of the exemplary circuit that can be used to realize the display 14 of equipment 10.As shown in Figure 6, show
Device 14 can have for the display control circuit 8 of the display image in display pixel array 6.Input 58 can be used for from control
The receive user brightness of circuit 16 is arranged.Control circuit 16 can for example from input/output unit such as touch sensor, button or its
His input-output unit 15 is receiving and process user input.User input may specify desired brightness arrange (for example it is, high,
In, it is low).Alternatively, or with combination with receiving and processing user's brightness setting input from user, control circuit
16 can be from the collection input such as ambient light sensor reading of the ambient light sensor in input-output unit 15.Can use environment
Photo measure is that display 14 automatically determines appropriate user's brightness setting.
User's brightness arranges UBS and can be received by control circuit such as look-up table 54.Look-up table 54 can be used to implement mapping
The curve of such as Fig. 5, user's brightness set value is mapped to peak brightness controlling feature figure by it.For example, if the value of UBS is figure
5 UBS1, then the output of look-up table 54 will be PLC4 (feature Fig. 4), and if the value of UBS is the UBS2 of Fig. 5, then look-up table 54
Output will be PLC2.
Can receive what is shown on display 14 from the system controller (control circuit 16) at numerical data input 26
Digital displaying data.Mean flow rate computer 50 receives numerical data (that is, the digital data frames that show on display 14),
And mean flow rate AL of each frame of computable number evidence or other monochrome informations can be extracted from Frame.
Mean flow rate AL may act as the first input of brightness controller 52.Peak brightness controlling feature figure numbering PN or identification
Select any bar characteristic pattern other information may act as brightness controller 52 second input.Brightness controller 52 can be in memorizer
It is middle to keep multiple available peak brightness controlling feature figure PL1, PL2, PL3, PL4 and PL5.In response to receiving given feature
Figure numbering PN, brightness controller 52 may be selected which bar peak brightness controlling feature figure activated.Then selected peak brightness
Controlling feature figure can be used to being calculated based on the value in the AL to the first input of controller 52 Vref output valve (such as referring to
Fig. 4).
γ reference blocks 56 are digital to analog converters.γ reference blocks 56 are converted to the numerical data being input on 60 at output 62
Corresponding analog data signal on corresponding data line D.Data wire D is to the respective display pixel in display pixel array 6
22 row provide the analog information data from γ reference blocks 56 (such as referring to Fig. 2).
The value of reference voltage V ref by produced by brightness controller 52 is used as the control input of γ reference blocks 56, such as ties
Close described in Fig. 3.In this way, display 14 implements the peak brightness control program that change is arranged in response to brightness.Use
The change that brightness is arranged (therefore is mapped to video data D to adjust for average brightness value AL to be mapped to into reference voltage V ref
Value) peak brightness controlling curve shape.Therefore, display pixel array 6 will not draw overcurrent and (or excessively subtract
Few display life), while avoiding such situation：Due to simultaneously using peak brightness control and independent dark brightness setting
So as to cause display 14 excessively dimmed.
Display 14 can present the performance change between pixel.For example, the threshold of the thin film transistor (TFT) in display picture element 22
Threshold voltage and other specification may change between the pixels.Measurement and the pixel performance change of compensation compensation scheme can be used
To prevent these changes from producing visible artifact on display 14.As shown in Figure 7, can provide for display control circuit 8
Storage device such as storage device 70.Storage device 70 can be for example static RAM or other memorizeies.Storage
Device 70 can be used to store the calibration data of the display picture element 22 in calibration display pixel array 6 to compensate performance change
Affect.During the operation of display 14, display control circuit 8 can be using the calibration data from storage device 70 (for example,
The frame of calibration data) so that compensate accordingly for each display picture element 22 in (calibration) array 6.
Can perform periodic measurement to obtain calibration data by the performance of the transistor arrangement to display picture element 22.Such as
Shown in the exemplary configuration of Fig. 7, display control circuit 8 can have the such as digital to analog converter of transistor performance measuring circuit 84
72nd, current source 74, digital to analog converter 82 and comparator 76.Transistor performance measuring circuit 84 can be using digital to analog converter 72 and electricity
Stream source 74 to the transistor in pel array 6 applies signal, and can be measured using Mathematical model control device 82 and comparator 76
Corresponding result.The transistor that can be come in characterization array 6 by the performance measurement of control circuit 8 and thereby acquisition transistor parameter
Threshold voltage etc..These results can calculate the calibration of the display 14 being stored in storage device 70 by control circuit 8
Used in the case of data.
Display picture element 22 can have the thin film for applying electric current to light emitting diode such as light emitting diode 78 for control
Transistor.As shown in Figure 7, for example, each display picture element 22 can have driving transistor TD, and driving transistor is in positive supply
With the coupled in series of corresponding light emitting diode 78 between the source electrode of voltage Vdd and ground connection 80.Driving transistor TD has drain electrode, grid
Pole and source electrode.Can pass through to open scan transistor TS in given row, from associated data wire D to the transistor TD in the row
Grid provide signal.Specifically, display control circuit 8 can by asserting given row in scanning (gate line) signal
SCANA to open the row in transistor TS.When transistor TS is opened in display picture element, by associated data wire D
On data signal the grid G of the transistor TD into the display picture element is provided, flow through transistor TD and luminous so as to adjust
The magnitude of current of diode 78.Transistor TC1 and TC2 are probably in the normal operation period what is closed.
When wishing that characterizing transistor TD enables display control circuit 8 to produce display picture element calibration data
Frame to be stored in storage device 70 in when, display control circuit 8 can optionally apply measurement signal and use circuit 84
To monitor the signal of the gained from transistor TD.
Fig. 8 shows the flow process using the illustrative steps for being related to operate display 14 of the circuit of type shown in Fig. 7
Figure.At step 82, deassert signal SCANA of control circuit 8 (that is, SCANA takes high level) is closing transistor TS.Control
Circuit 8 also asserts control signal CNT (that is, CNT takes low level) to open transistor TC1.When transistor TC1 is opened, by crystalline substance
The grid G and source S of body pipe TD is shorted together and transistor TD is placed in into saturation.Control circuit 8 asserts signal SCANB
(that is, SCANB takes high level) is opening transistor TC2.Then control electric current source 74 is come using digital to analog converter 72 so that (logical
Cross transistor TC2) apply known electric current I to transistor TD.When transistor TD is in saturation and transmits electric current I,
Circuit 8 produces a series of different output voltage received in one of the input place of comparator 76 using digital to analog converter 82
Vref.Voltage (that is, the voltage on transistor TD) in another input receiving circuit 86 of comparator 76.In comparator 76
When output TRIGGER changes state, control circuit 8 is able to conclude that the voltage on circuit 86 is equal to reference voltage V ref.Therefore, this
The scheme of kind allows control circuit 8 to measure the electric current I and voltage V of transistor TD simultaneously, while transistor TD is placed in into saturation.
At step 84, it is determined whether to gather other measured value and (that is, apply the measurement under the different value of electric current I
Value).If gathering other measured value, the operation of display control circuit 8 is looped back to step 82, as illustrated by line 86.If
The executed all desired measurement of display picture element, then process and can continue to step 88.In being preferably for array 6
Each display picture element 22 come execution step 82 measurement (that is, two or more or three or more it is corresponding not
Under with levels of current I, perform two or more times for each display picture element 22 or measure three times or more).Control
Circuit 8 preferably has sufficient amount of current source and voltage detector with once for full line display picture element 22 being surveyed
Amount (for example, uses display picture element 22 to display for a user another a period of time of view data during vertical banking interval or not
Period).
Equation 1 elaborates measured (known) electric current I (measuring using current source 74), measured transistor electricity
Pressure Vg (voltage and known voltage Vdd measured by from path 86 is obtained) and transistor parameter such as threshold voltage vt, mistake
Relation between journey mutual conductance K and channel length index of modulation λ.
I=Κ (Vgs-Vt)2+λ(Vgs-Vt) (1)
The number of times for performing measurement determines the quantity of information that can be gathered by the control circuit 8 on display picture element 22.For example,
Measured twice by performing on given display picture element under two different levels of current, threshold value electricity can be solved from equation 1
Pressure Vt (that is, the threshold voltage of transistor TD).From the given value of Vt, transistor parameter such as mobility can be derived.Given aobvious
In showing the situation that three measurements are carried out in device pixel, also channel length index of modulation λ can be solved from equation 1, be further facilitated
Accurately compensation.
After the transistor parameter of driving transistor TD is calculated at step 88, can correspondingly update and be stored in storage device
The calibration data (offset data) of the display 14 in 70.
At step 92, control circuit 8 can use stored calibration data and just show on display 14 to calibrate
Data frame (that is, when to display 14 provide data frame when, it is contemplated that the known features of each display picture element cause mend
Repay the change between pixel).In the normal operation period, control circuit 8 closes transistor TC1 and TC2.Using transistor TS to every
Loading data in individual pixel, and the electric current for flowing through light emitting diode 78 is correspondingly controlled using driving transistor TD.
According to one embodiment, there is provided including the display circuit of display pixel array, and in display picture element
The display control circuit of display image on array, the display control circuit includes digital to analog converter and brightness controller.
The digital to analog converter has the input for receiving the numerical data for image, and the image had to showing in display pixel array
Show that device pixel column provides the output of the corresponding analog data signal for image, and turned with controlling digital-to-analogue with reference voltage is received
The reference voltage input of parallel operation；The brightness controller receives the first input and the second input, selects to give based on the second input
Peak brightness controlling feature figure, and using selected peak brightness controlling feature figure and using first input come to digital-to-analogue
Transducer provides reference voltage.
According to another embodiment, display control circuit includes mean flow rate computer, and the mean flow rate computer connects
Receive numerical data and produce the first input, first input includes the average frame luminance for numerical data.
According to another embodiment, display control circuit includes that receiving display brightness arranges and produce corresponding informance
Circuit, using described information, the brightness controller selects given peak brightness controlling feature figure.
According to another embodiment, circuit includes look-up table.
According to another embodiment, look-up table has and receives input that display brightness arranges and with its place's offer of institute
The output of the information of the given peak brightness controlling feature figure of identification.
According to another embodiment, the second input includes recognizing the information of given peak brightness controlling feature figure, and bright
Degree controller is configured to receive the information of the given peak brightness controlling feature figure of identification.
According to another embodiment, brightness controller is configured to keep multiple different peak brightness controlling feature figures simultaneously
And be configured to based on the information for recognizing given peak brightness controlling feature figure from multiple different peak brightness controlling feature figures
It is middle to select given peak brightness controlling feature figure, and recognize that the information for giving peak brightness controlling feature figure is from lookup
The peak brightness controlling feature figure numbering of table.
According to another embodiment, display pixel array includes organic light emitting diode display pel array.
According to one embodiment, there is provided a kind of method of operation display, the display has in display picture element battle array
The display control circuit of display image on row, the method include using display control circuit based on display brightness arrange come
Peak brightness controlling feature figure is selected, using display control circuit, using selected peak brightness controlling feature figure next life
Into control signal, and digital displaying data is converted to into analog information number using the digital to analog converter controlled by control signal
According to.
According to another embodiment, the method includes that providing simulation to the display picture element row in display pixel array shows
The registration display image in display pixel array according to this.
According to another embodiment, the method includes being calculated for digital displaying data using display control circuit
Average frame luminance.
According to another embodiment, generating control signal includes using selected peak brightness controlling feature figure based on flat
Frame brightness is generating control signal.
According to another embodiment, the method includes use environment optical sensor to obtain display brightness setting.
According to another embodiment, the method includes that obtaining display brightness from user using input/output unit sets
Put.
According to another embodiment, the control signal includes reference voltage and changes digital displaying data including based on base
Digital displaying data is converted to analog information data by quasi- voltage.
According to one embodiment, there is provided a kind of display, the display includes display pixel array, digital-to-analogue conversion
Device, brightness controller, and produce the circuit of output.The display pixel array has the row and column of display picture element；The number
Weighted-voltage D/A converter receive digital displaying data and based on the reference voltage received at the control input of digital to analog converter come to show
Show that device pixel column provides corresponding analog information data signal；The brightness controller has multiple peak brightness controlling feature figures；
The circuit of the generation output selects being used for by brightness controller in multiple peak brightness controlling feature figures to produce reference voltage
One peak brightness controlling feature figure.
According to another embodiment, the display includes mean flow rate computer, and the mean flow rate computer receives numeral
Video data simultaneously calculates mean flow rate based on digital displaying data.
According to another embodiment, brightness controller is configured with selected in multiple peak brightness controlling feature figures
A peak brightness controlling feature figure selecting simultaneously produces reference voltage using mean flow rate.
According to another embodiment, the circuit is configured to arrange to produce based on the display brightness of display pixel array
Raw output.
According to another embodiment, the circuit includes that receiving display brightness is arranged and produced based on display brightness setting
The look-up table of raw output.
Above content is merely exemplary and those skilled in the art can in the scope without departing from the present embodiment and
Various modifications are made in the case of essence.Above-described embodiment can individually be implemented or can implement in any combination.
Claims (20)
1. display circuit, including：
Display pixel array；With
Display control circuit, display control circuit display image in the display pixel array, wherein described
Display control circuit includes：
Digital to analog converter, the digital to analog converter has the input for receiving the numerical data for described image, with to described
Display picture element row in display pixel array provide the output of the corresponding analog data signal for described image, and have
There is the reference voltage for receiving reference voltage to control the digital to analog converter to be input into；With
Brightness controller, the brightness controller receives the first input and the second input, and is selected based on the described second input
Given peak brightness controlling feature figure, and come using selected peak brightness controlling feature figure and using the described first input
The reference voltage is provided to the digital to analog converter.
2. display circuit according to claim 1, wherein the display control circuit includes mean flow rate computer,
The mean flow rate computer receives the numerical data and produces first input, wherein first input includes being directed to
The average frame luminance of the numerical data.
3. display circuit according to claim 2, wherein the display control circuit also includes receiving display bright
Degree is arranged and produces the circuit of corresponding informance, and the brightness controller selects the given peak value bright using the corresponding informance
Degree controlling feature figure.
4. display circuit according to claim 3, wherein the circuit includes look-up table.
5. display circuit according to claim 4, wherein the look-up table has and receives the display brightness and arrange
Input and with the output of the described information for providing the identification given peak brightness controlling feature figure at which.
6. display circuit according to claim 5, wherein second input includes recognizing the given peak brightness
The described information of controlling feature figure, and wherein described brightness controller is configured to the reception identification given peak brightness control
The described information of characteristic pattern processed.
7. display circuit according to claim 6, wherein the brightness controller is configured to keep multiple different
Peak brightness controlling feature figure and be configured to described information based on the identification given peak brightness controlling feature figure come
The given peak brightness controlling feature figure is selected from the plurality of different peak brightness controlling feature figures, and is wherein recognized
The described information of the given peak brightness controlling feature figure is the peak brightness controlling feature figure numbering from the look-up table.
8. display circuit according to claim 1, wherein the display pixel array includes Organic Light Emitting Diode
Display pixel array.
9. it is a kind of operation display method, the display have in display pixel array display image display control
Circuit processed, methods described includes：
Arrange to select peak brightness controlling feature figure based on display brightness using the display control circuit；
Using the display control circuit, using selected peak brightness controlling feature figure control signal is generated；And
Digital displaying data is converted to into analog information data using the digital to analog converter controlled by the control signal.
10. method according to claim 9, also includes being provided to the display picture element row in the display pixel array
The analog information data in the display pixel array showing described image.
11. methods according to claim 10, also include：
Using the display control circuit, the average frame luminance for the digital displaying data is calculated.
12. methods according to claim 11, wherein generate the control signal to include using selected peak brightness
Controlling feature figure generates the control signal based on the average frame luminance.
13. methods according to claim 12, also include：
Use environment optical sensor is arranged obtaining the display brightness.
14. methods according to claim 12, also include：
The display brightness is obtained using input/output unit from user to arrange.
15. methods according to claim 12, wherein the control signal includes reference voltage and wherein changes described
Digital displaying data includes the digital displaying data is converted to into the analog information data based on the reference voltage.
A kind of 16. display, including：
Display pixel array, the display pixel array has display picture element row and display picture element row；
Digital to analog converter, the digital to analog converter receives digital displaying data and based on the control input in the digital to analog converter
The reference voltage that place receives to provide corresponding analog information data signal to display picture element row；
Brightness controller, the brightness controller has multiple peak brightness controlling feature figures；With
Produce the circuit of output, the output select in the plurality of peak brightness controlling feature figure by the brightness controller
For producing a peak brightness controlling feature figure of the reference voltage.
17. display according to claim 16, also including mean flow rate computer, the mean flow rate computer is received
The digital displaying data simultaneously calculates mean flow rate based on the digital displaying data.
18. display according to claim 17, wherein the brightness controller is configured with the plurality of peak value
A selected peak brightness controlling feature figure in brilliance control characteristic pattern is simultaneously produced described using the mean flow rate
Reference voltage.
19. display according to claim 18, wherein the circuit is configured to based on for the display picture element
The display brightness of array arranges to produce the output.
20. display according to claim 19, wherein the circuit includes look-up table, the look-up table receives described aobvious
Show that device brightness arranges and arranges to produce the output based on the display brightness.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201361900890P | 2013-11-06 | 2013-11-06 | |
| US61/900,890 | 2013-11-06 | ||
| US14/329,197 US9396684B2 (en) | 2013-11-06 | 2014-07-11 | Display with peak luminance control sensitive to brightness setting |
| US14/329,197 | 2014-07-11 |
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| CN104332151A CN104332151A (en) | 2015-02-04 |
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| KR101884233B1 (en) * | 2016-08-26 | 2018-08-01 | 삼성전자주식회사 | Display apparatus and driving method thereof |
| CN106484354B (en) * | 2016-10-31 | 2019-12-20 | 维沃移动通信有限公司 | Display brightness adjusting method and mobile terminal |
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| WO2021142099A1 (en) * | 2020-01-07 | 2021-07-15 | Compound Photonics U.S. Corporation | Systems and methods of driving a display with high bit depth |
| CN112908273A (en) * | 2021-02-02 | 2021-06-04 | 海信视像科技股份有限公司 | Display device and backlight adjusting method |
| US11967264B2 (en) | 2021-02-22 | 2024-04-23 | Chengdu Boe Optoelectronics Technology Co., Ltd. | Method and apparatus for obtaining correspondences between grayscales and grayscale voltages, and display apparatus |
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