CN105280139B - AMOLED luminance compensation methods and AMOLED drive systems - Google Patents
AMOLED luminance compensation methods and AMOLED drive systems Download PDFInfo
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Abstract
The present invention provides a kind of AMOLED luminance compensation methods and AMOLED drive systems,Have additional including first,Second,And the 3rd luminance sensor (42,43,44) and compensation IC (41) compensating unit (4),And including red,Green,And blue test pixel (51,52,53) test pixel unit (5),Pass through first,Second,And the 3rd luminance sensor (42,43,44) sensing is red respectively,Green,And blue test pixel (51,52,53) in the brightness at initial moment and compensation moment,And then red can be calculated by compensating IC (41),Green,And the offset voltage that blue Organic Light Emitting Diode is respectively necessary for,Again to red,Green,And blue Organic Light Emitting Diode carries out luminance compensation respectively,Display brightness decline and colour cast caused by the oled luminance rate of decay difference of different colours caused by the brightness decay of Organic Light Emitting Diode can be improved,Keep the luminosity and colour gamut of AMOLED.
Description
Technical field
The present invention relates to display technology field, more particularly to a kind of AMOLED luminance compensation methods and AMOLED drivetrains
System.
Background technology
Flat-panel display device has many merits such as thin fuselage, power saving, radiationless, is widely used.It is existing
Flat-panel display device mainly includes liquid crystal display device (Liquid Crystal Display, LCD) and Organic Light Emitting Diode
Display device (Organic Light Emitting Display, OLED).
Organic LED display device has self-luminous, driving voltage is low, luminous efficiency is high, the response time is short, clear
Clear degree and contrast are high, nearly 180 ° of visual angles, use temperature range is wide, it can be achieved that Flexible Displays and large area total colouring etc. are many
Advantage, it is the display device for most having development potentiality to be known as by industry.OLED display can be divided into nothing according to type of drive
Source matrix type OLED (Passive Matrix OLED, PMOLED) and active array type OLED (Active Matrix OLED,
AMOLED two class of) two major class, i.e. direct addressin and thin film transistor (TFT) (Thin Film Transistor, TFT) matrix addressing.Its
In, AMOLED has the pixel in array arrangement, belongs to active display type, luminous efficacy is high, is typically used as fine definition
Large scale display device.
Organic Light Emitting Diode generally includes：Substrate, the anode on substrate, the organic luminous layer on anode,
Electron transfer layer on organic luminous layer and the cathode on electron transfer layer.Launch during work to organic luminous layer
These electronics and hole combination are produced excitability electron-hole pair by the hole from anode and the electronics from cathode, and will
Excitability electron-hole pair is converted to ground state realization from excited state and shines.
AMOLED is current driving apparatus, when there is electric current to flow through Organic Light Emitting Diode, organic light-emitting diode,
And luminosity is determined by the electric current for flowing through Organic Light Emitting Diode itself, the electric current flowed through is bigger, Organic Light Emitting Diode
Brightness is also bigger.Most of existing integrated circuit (Integrated Circuit, IC) all only transmits voltage signal, therefore
The drive system of AMOLED needs to complete the task that voltage signal is changed into current signal.However, due to working long hours
Under Dc bias, the brightness of Organic Light Emitting Diode can gradually decay, therefore prolong with the usage time of Organic Light Emitting Diode
Long, the brightness of AMOLED display device can be more and more lower.Further, the rate of decay of the Organic Light Emitting Diode of different colours
Also differ, as shown in Figure 1, red (Red, R), green (Green, G), blue (Blue, B) three kinds of colors organic light emission
In diode, Blue OLED decay is the most obvious, this can cause AMOLED display device to produce colour cast, and during with using
Between extension colour cast can be increasingly severe.
The content of the invention
It is an object of the invention to provide a kind of AMOLED luminance compensation methods, can improve because of Organic Light Emitting Diode
Caused by display brightness caused by brightness decay declines the oled luminance rate of decay difference with different colours
Colour cast.
The present invention also aims to provide a kind of AMOLED drive systems, different colours organic light-emitting diodes are can compensate for
The brightness decay of pipe, keeps the luminosity and colour gamut of AMOLED.
To achieve the above object, the present invention provides a kind of AMOLED luminance compensation methods, include the following steps：
Step 1, provide an AMOLED drive systems, including：Display unit, the source electrode being electrically connected with the display unit
Driving unit, the drive element of the grid being electrically connected with the display unit, the benefit being electrically connected with the source drive unit
Repay unit and the test pixel unit being electrically connected with source drive unit and drive element of the grid；
The test pixel unit is arranged on outside the display unit, including：One red test pixel, a green test picture
Element and a blue test pixel；
The compensating unit includes first, second for compensating IC and being electrically connected with the compensation IC and the 3rd brightness passes
Sensor, described first, second and the 3rd luminance sensor correspond to red test pixel, green test pixel and blueness respectively and survey
Pixel is tried to set；
Step 2, into the initial moment, the source drive unit and drive element of the grid are to display unit and test pixel
Unit provides data-signal and scanning signal, lights the display unit, red test pixel, green test pixel and blueness
Test pixel, described first, second and the 3rd luminance sensor gather the initial moment under default canonical reference grayscale respectively
Red test pixel, green test pixel and blue test pixel brightness, and send monochrome information to compensation IC, institute
State compensation IC according to red, green in the red test pixel at initial moment, green test pixel and blue test pixel and
The brightness of blue organic light emitting diode and the relation curve of electric current calculate the red, green and blueness at initial moment respectively
The driving current of test pixel；
Step 3, into the compensation moment, described first, second and the 3rd luminance sensor gather mended under a certain grayscale respectively
The brightness of the red test pixel at moment, green test pixel and blue test pixel is repaid, and sends monochrome information to compensation
IC, the compensation IC are calculated according to gamma curve and are obtained the red test pixel that the moment is compensated under canonical reference grayscale, green is surveyed
Try the brightness of pixel and blue test pixel；
Step 4, the compensation IC are according to the red test pixel at initial moment, green test picture under canonical reference grayscale
The brightness of element and blue test pixel tests picture with the red test pixel at compensation moment, green under canonical reference grayscale respectively
The relation of the brightness of element and blue test pixel, the red, green and blue test pixel for obtaining the compensation moment are joined in standard
Grayscale is examined to be issued to and the driving current needed for the initial moment same brightness and red at initial moment, green and blueness test
The relation of the driving current of pixel, and then the red, green and blue test pixel at compensation moment is calculated in canonical reference
Grayscale is issued to the driving current needed for initial moment same brightness；
Step 5, the compensation IC are thin according to being driven in red test pixel, green test pixel and blue test pixel
The electric current of film transistor and the characteristic curve of voltage, are calculated under canonical reference grayscale red, green and blue test pixel
Reach the driving voltage needed for same brightness at initial moment, compensation moment respectively, it is red, green then to calculate the compensation moment respectively
Driving voltage and the driving voltage of red, green and blue test pixel of initial moment needed for color and blue test pixel
Difference, i.e., red, green and blue offset voltage；
Source drive unit, is supplied to red in display unit, green and blue Organic Light Emitting Diode by step 6
The voltage of data-signal be modified to respectively the sum of the voltage of former data-signal and red offset voltage, former data-signal voltage with
The sum of voltage and blue offset voltage of the sum of green offset voltage and former data-signal, complete AMOLED luminance compensations.
The canonical reference grayscale is 255 grayscale.
The AMOLED drive systems further include：Signal interface unit, timing control unit and power supply unit；
The signal interface unit is electrically connected with the timing control unit and power supply unit；
The timing control unit and the signal interface unit, power supply unit, drive element of the grid and source drive list
Member is electrically connected；
The power supply unit and the signal interface unit, timing control unit, drive element of the grid, source drive list
Member, compensation IC, display unit and test pixel unit are electrically connected.
It is supplied to the red test pixel, the scanning signal of green test pixel and blue test pixel and data letter
Number set with reference to any pixel in display unit.
The compensation IC is built-in with the red test pixel, green test pixel and blue test pixel at initial moment
Red, green and the blue brightness of organic light emitting diode and relation curve, gamma curve and the red test picture of electric current
The electric current of driving thin film transistor (TFT) and the characteristic curve of voltage in element, green test pixel and blue test pixel.
The present invention also provides a kind of AMOLED drive systems, including：What display unit and the display unit were electrically connected
Source drive unit, the drive element of the grid being electrically connected with the display unit and the source drive unit are electrically connected
Compensating unit and the test pixel unit that is electrically connected with source drive unit and drive element of the grid；
The test pixel unit is arranged on outside the display unit, including：One red test pixel, a green test picture
Element and a blue test pixel；
The compensating unit includes first, second for compensating IC and being electrically connected with the compensation IC and the 3rd brightness passes
Sensor, described first, second and the 3rd luminance sensor correspond to red test pixel, green test pixel and blueness respectively and survey
Pixel is tried to set；
Described first, second and the 3rd luminance sensor be respectively used to collection red test pixel, green test pixel,
And the brightness of blue test pixel, and monochrome information is passed into compensation IC；
The compensation IC be used for according to first, second and the 3rd initial moment for collecting of luminance sensor with compensation when
The brightness of the red test pixel at quarter, green test pixel and blue test pixel, is calculated red, green and blueness is surveyed
Try pixel and reach the driving current needed for same brightness at initial moment, compensation moment respectively under canonical reference grayscale, then divide
The red, green of driving voltage needed for the compensation red at moment, green and blue test pixel and initial moment is not calculated
The difference of color and the driving voltage of blue test pixel, i.e. red, green and blue offset voltage, by red, green and indigo plant
Colorimetric compensation voltage passes to source drive unit；
The source drive unit is used to that red test pixel in display unit, green test pixel and indigo plant will to be supplied to
The voltage of the data-signal of red in color test pixel, green and blue Organic Light Emitting Diode is modified to former data letter respectively
Number the sum of voltage and red offset voltage, the sum of voltage and the green offset voltage of former data-signal and former data-signal
The sum of voltage and blue offset voltage.
The canonical reference grayscale is 255 grayscale.
The AMOLED drive systems further include：Signal interface unit, timing control unit and power supply unit；
The signal interface unit is electrically connected with the timing control unit and power supply unit；
The timing control unit and the signal interface unit, power supply unit, drive element of the grid and source drive list
Member is electrically connected；
The power supply unit and the signal interface unit, timing control unit, drive element of the grid, source drive list
Member, compensation IC, display unit and test pixel unit are electrically connected.
It is supplied to the red test pixel, the scanning signal of green test pixel and blue test pixel and data letter
Number set with reference to any pixel in display unit.
The compensation IC is built-in with the red test pixel, green test pixel and blue test pixel at initial moment
Red, green and the blue brightness of organic light emitting diode and relation curve, gamma curve and the red test picture of electric current
The electric current of driving thin film transistor (TFT) and the characteristic curve of voltage in element, green test pixel and blue test pixel.
Beneficial effects of the present invention：A kind of AMOLED luminance compensation methods provided by the invention and AMOLED drive systems,
Have additional and luminance sensor and compensate the compensating unit of IC and including red, green and blue including first, second and the 3rd
The test pixel unit of color test pixel, by first, second and the 3rd luminance sensor sense red, green and blue respectively
Brightness of the color test pixel at initial moment and compensation moment, and then red, green and blueness can be calculated by compensating IC
The offset voltage that Organic Light Emitting Diode is respectively necessary for, then red, green and blue Organic Light Emitting Diode are carried out respectively bright
Degree compensation, can improve caused by the brightness decay of Organic Light Emitting Diode display brightness decline it is organic with different colours
Colour cast caused by light-emitting diode luminance rate of decay difference, keeps the luminosity and colour gamut of AMOLED.
Brief description of the drawings
In order to be further understood that the feature of the present invention and technology contents, refer to below in connection with the detailed of the present invention
Illustrate and attached drawing, however attached drawing only provide with reference to and explanation use, be not used for being any limitation as the present invention.
In attached drawing,
Fig. 1 is brightness decay curve's figure of red, green and blue Organic Light Emitting Diode；
Fig. 2 is the flow chart of the AMOLED luminance compensation methods of the present invention；
Fig. 3 is the block diagram of the AMOLED drive systems of the present invention；
Fig. 4 is that test pixel and the position of the luminance sensor in compensating unit show in AMOLED drive systems of the invention
It is intended to.
Embodiment
Further to illustrate the technological means and its effect of the invention taken, below in conjunction with being preferable to carry out for the present invention
Example and its attached drawing are described in detail.
Referring to Fig. 2, present invention firstly provides a kind of AMOLED luminance compensation methods, include the following steps：
Step 1, provide an AMOLED drive systems.
Please refer to Fig. 3 and Fig. 4, the AMOLED drive systems include：Display unit 1 and the electricity of the display unit 1
Property connection source drive unit 2, with the display unit 1 be electrically connected drive element of the grid 3, with the source drive list
The compensating unit 4 that member 2 is electrically connected and the test pixel unit being electrically connected with source drive unit 2 and drive element of the grid 3
5。
Further, the test pixel unit 5 is arranged on outside the display unit 1, i.e., arranged on AMOLED display device
Non-display area, including：Red test pixel 51, green test pixel 52 and blue test pixel 53.
The compensating unit 4 includes compensation IC41 and be electrically connected with the compensation IC41 first, second and the 3rd
Luminance sensor 42,43,44, described first, second and the 3rd luminance sensor 42,43,44 correspond to red test pixel respectively
51st, green test pixel 52 and blue test pixel 53 are set.
The AMOLE drive systems further include：Signal interface unit 6, timing control unit 7 and power supply unit 8.It is described
Signal interface unit 6 is electrically connected with the timing control unit 7 and power supply unit 8；The timing control unit 7 with it is described
Signal interface unit 6, power supply unit 8, drive element of the grid 3 and source drive unit 2 are electrically connected；The power supply unit 8 with
The signal interface unit 6, timing control unit 7, drive element of the grid 3 and source drive unit 2, compensation IC41, display are single
Member 1 and test pixel unit 5 are electrically connected.Power supply signal is distributed to power supply unit 8 by the signal interface unit 6, by LVDS
The display signal of pattern distributes to timing control unit 7.Timing control unit 7 handles signal, by source drive unit 2
The display signal for the Mini-LVDS patterns that can be identified passes to source drive unit 2, and drive element of the grid 3 can be identified
Clock signal and control signal pass to drive element of the grid 3.The power supply unit 8 is the power supply of other each units, as to institute
State display unit 1 and test pixel unit 5 provides supply voltage Vdd.
The display unit 1 includes multiple pixels in matrix form arrangement, the red test pixel 51, green test picture
The pixel-driving circuit of each pixel is traditional 2T1C structures in element 52, blue test pixel 53 and display unit 1, that is, is wrapped
A switching thin-film transistor, a driving thin film transistor (TFT) and a storage capacitance are included, this is the prior art, is not unfolded to describe herein.
Step 2, into the initial moment, the source drive unit 2 and drive element of the grid 3 are to display unit 1 and test
Pixel unit 5 provides data-signal Data and scanning signal Gate, lights the display unit 1, red test pixel 51, green
Test pixel 52 and blue test pixel 53, described first, second and the 3rd luminance sensor 42,43,44 gather respectively
The red test pixel 51 at initial moment, green test pixel 52 and blue test pixel 53 under default canonical reference grayscale
Brightness, and send monochrome information to compensation IC41, the compensation IC41 according to the red test pixel 51 at initial moment, green
Red, green and the blue brightness of organic light emitting diode and the pass of electric current in color test pixel 52 and blue test pixel 53
It is the driving current that curve calculates the red at initial moment, green and blue test pixel 51,52,53 respectively.
Specifically, there is provided the scanning to the red test pixel 51, green test pixel 52 and blue test pixel 53
Any pixel that signal Gate and data-signal Data is referred in display unit 1 is set.
It is red, green in the initially red test pixel 51 at moment, green test pixel 52 and blue test pixel 53
Color and the blue brightness of organic light emitting diode and the relation curve of electric current are built in compensation IC41, itself and organic light emission two
The material of pole pipe is related, can be obtained by actual measurement.255 grayscale may be selected in the canonical reference grayscale, but are not intended to be limited to
255 grayscale, other grey decision-makings can also be used as canonical reference grayscale.
Step 3, into compensation the moment, described first, second and the 3rd luminance sensor 42,43,44 gather respectively it is a certain
Compensate the brightness of the red test pixel 51 at moment, green test pixel 52 and blue test pixel 53 under grayscale, and by brightness
Information sends compensation IC41, the compensation IC41 to and compensates the red of moment according under gamma curve calculating acquisition canonical reference grayscale
The brightness of color test pixel 51, green test pixel 52 and blue test pixel 53.
Specifically, the gamma curve is built in compensation IC41.
Step 4, the compensation IC41 are tested according to the red test pixel 51 at initial moment, green under canonical reference grayscale
The brightness of pixel 52 and blue test pixel 53 is respectively with compensating the red test pixel 51, green at moment under canonical reference grayscale
The relation of the brightness of color test pixel 52 and blue test pixel 53, obtains the red, green and blueness test at compensation moment
Pixel 51,52,53 is issued to and the driving current needed for initial moment same brightness and initial moment in canonical reference grayscale
The relation of the driving current of red, green and blue test pixel 51,52,53, so be calculated the compensation moment red,
Green and blue test pixel 51,52,53 are issued to and the driving electricity needed for initial moment same brightness in canonical reference grayscale
Stream.
Illustrate：If compensation the moment, brightness of the red test pixel 51 under 255 grayscale is a, and it is initial when
Brightness of the red test pixel 51 at quarter under 255 grayscale is 2a, then compensates the moment, and the red test pixel 51 is to reach 2a
The required driving current of brightness should be 2 times of driving current of the initial moment, the driving current at even initial moment is I,
The moment then is being compensated, which is 2I in the driving current that 255 grayscale are issued to needed for the brightness of 2a.
Step 5, the compensation IC41 are according to red test pixel 51, green test pixel 52 and blue test pixel 53
The electric current of interior driving thin film transistor (TFT) and the characteristic curve of voltage, are calculated under canonical reference grayscale red, green and blueness
Test pixel 51,52,53 reaches the driving voltage needed for same brightness at initial moment, compensation moment respectively, then counts respectively
Calculate driving voltage needed for compensation moment red, green and blue test pixel 51,52,53 with the initial moment red, green,
And the difference of the driving voltage of blue test pixel 51,52,53, i.e., red, green and blue offset voltage.
Specifically, driving film is brilliant in the red test pixel 51, green test pixel 52 and blue test pixel 53
The electric current of body pipe and the characteristic curve of voltage are built in compensation IC41.
Accept the citing in step 4：If under 255 grayscale, red test pixel 51 is equal at initial moment and compensation moment
Reach the brightness of 2a, the driving current at initial moment is I, and the driving current for compensating the moment is 2I, according to red test pixel 51
The electric current of interior driving thin film transistor (TFT) and the characteristic curve of voltage, calculate driving electricity of the red test pixel 51 at the initial moment
Press as V0, be V in compensation moment required driving voltage, then red offset voltage is V-V0.It can be counted according to same method
Calculate green and blue offset voltage.
Source drive unit 2, is supplied in display unit 1 red, green and blue Organic Light Emitting Diode by step 6
Data-signal Data voltage be modified to the sum of the voltage of former data-signal Data and red offset voltage respectively, former data are believed
The sum of the voltage of the sum of the voltage of number Data and green offset voltage and former data-signal Data and blue offset voltage, are completed
AMOLED luminance compensations.
Above-mentioned AMOLED luminance compensation methods, have additional including first, second and 42,43,44 and of the 3rd luminance sensor
The compensating unit 4 of IC41 and the test pixel unit 5 including red, green and blue test pixel 51,52,53 are compensated,
By first, second and the 3rd luminance sensor 42,43,44 sense respectively red, green and blue test pixel 51,52,
53 brightness at initial moment and compensation moment, and then red, green and the organic hair of blueness can be calculated by compensating IC41
The offset voltage that optical diode is respectively necessary for, then brightness benefit is carried out respectively to red, green and blue Organic Light Emitting Diode
Repay, display brightness decline and the organic light emission of different colours caused by the brightness decay of Organic Light Emitting Diode can be improved
Colour cast caused by LED lightness rate of decay difference, keeps the luminosity and colour gamut of AMOLED.
Refer to Fig. 3 and combine Fig. 4, the present invention also provides a kind of AMOLED drive systems, including：Display unit 1 and institute
State display unit 1 electric connection source drive unit 2, with the display unit 1 be electrically connected drive element of the grid 3, with
The compensating unit 4 and be electrically connected with source drive unit 2 and drive element of the grid 3 that the source drive unit 2 is electrically connected
Test pixel unit 5.
Further, the test pixel unit 5 is arranged on outside the display unit 1, i.e., arranged on AMOLED display device
Non-display area, including：Red test pixel 51, green test pixel 52 and blue test pixel 53.
The compensating unit 4 includes compensation IC41 and be electrically connected with the compensation IC41 first, second and the 3rd
Luminance sensor 42,43,44, described first, second and the 3rd luminance sensor 42,43,44 correspond to red test pixel respectively
51st, green test pixel 52 and blue test pixel 53 are set.
The AMOLED drive systems further include：Signal interface unit 6, timing control unit 7 and power supply unit 8.It is described
Signal interface unit 6 is electrically connected with the timing control unit 7 and power supply unit 8；The timing control unit 7 with it is described
Signal interface unit 6, power supply unit 8, drive element of the grid 3 and source drive unit 2 are electrically connected；The power supply unit 8 with
The signal interface unit 6, timing control unit 7, drive element of the grid 3 and source drive unit 2, compensation IC41, display are single
Member 1 and test pixel unit 5 are electrically connected.Power supply signal is distributed to power supply unit 8 by the signal interface unit 6, by LVDS
The display signal of pattern distributes to timing control unit 7.Timing control unit 7 handles signal, by source drive unit 2
The display signal for the Mini-LVDS patterns that can be identified passes to source drive unit 2, and drive element of the grid 3 can be identified
Clock signal and control signal pass to drive element of the grid 3.The power supply unit 8 is the power supply of other each units, as to institute
State display unit 1 and test pixel unit 5 provides supply voltage Vdd.
The display unit 1 includes multiple pixels in matrix form arrangement, the red test pixel 51, green test picture
The pixel-driving circuit of each pixel is traditional 2T1C structures in element 52, blue test pixel 53 and display unit 1, that is, is wrapped
A switching thin-film transistor, a driving thin film transistor (TFT) and a storage capacitance are included, this is the prior art, is not unfolded to describe herein.
Described first, second and the 3rd luminance sensor 42,43,44 be respectively used to collection red test pixel 51, green
The brightness of test pixel 52 and blue test pixel 53, and monochrome information is passed into compensation IC41.
The compensation IC41 be used for according to first, second and the 3rd luminance sensor 42,43,44 collect it is initial when
The brightness with the red test pixel 51 at compensation moment, green test pixel 52 and blue test pixel 53 is carved, is calculated red
Color, green and blue test pixel 51,52,53 reach identical at initial moment, compensation moment respectively under canonical reference grayscale
Driving current needed for brightness, then the red, green and blue 51,52,53 institute of test pixel at compensation moment are calculated respectively
The difference of the driving voltage of the driving voltage and the red at initial moment, green and the blue test pixel 51,52,53 that need, i.e., it is red
Color, green and blue offset voltage, source drive unit 2 is passed to by red, green and blue offset voltage.
The source drive unit 2 is used to that red test pixel 51 in display unit 1, green test pixel will to be supplied to
52 and blue test pixel 53 in the voltage of the data-signal Data of red, green and blue Organic Light Emitting Diode repair respectively
Just it is the sum of the voltage of former data-signal Data and red offset voltage, voltage and the green offset voltage of former data-signal Data
The sum of and former data-signal Data the sum of voltage and blue offset voltage, with to red, green and blue organic light emission two
Pole pipe carries out luminance compensation respectively, can improve caused by the brightness decay of Organic Light Emitting Diode display brightness decline with
Colour cast caused by the oled luminance rate of decay difference of different colours, keeps the luminosity and color of AMOLED
Domain.
Specifically, red test pixel 51, green of the drive element of the grid 3 into test pixel unit 5 test picture
Element 52 and blue test pixel 53 provide scanning signal Gate, and the source drive unit 2 is red into test pixel unit 5
Color test pixel 51, green test pixel 52 and blue test pixel 53 provide data-signal Data；It is supplied to the red survey
The scanning signal Gate and data-signal Data of pixel 51, green test pixel 52 and blue test pixel 53 are tried with reference to display
Any pixel in unit 1 is set.
255 grayscale may be selected in the canonical reference grayscale, but are not intended to be limited to 255 grayscale, other grey decision-makings can also be made
For canonical reference grayscale.
The compensation IC41 is built-in with the red test pixel 51, green test pixel 52 and blueness test at initial moment
Red in pixel 53, green and the blue brightness of organic light emitting diode and relation curve, gamma curve, the Yi Jihong of electric current
The electric current of driving thin film transistor (TFT) and the spy of voltage in color test pixel 51, green test pixel 52 and blue test pixel 53
Linearity curve.
The specific implementation process that the AMOLED drive systems carry out luminance compensation is as follows：If at the compensation moment, according to gal
It is a that horse curve, which obtains brightness of the red test pixel 51 under 255 grayscale, and initially the red test pixel 51 at moment exists
Brightness under 255 grayscale is 2a, then compensates the moment, the required driving electricity of brightness of the red test pixel 51 to reach 2a
Flow the driving current for the initial moment 2 times, even according to red organic light emission two in the red test pixel 51 at initial moment
It is I that the driving current at initial moment, which is calculated, in the level brightness of pipe and the relation curve of electric current, then is surveyed in compensation moment, the red
It is 2I that pixel 51, which is tried, in the driving current that 255 grayscale are issued to needed for the brightness of 2a, further according to driving in red test pixel 51
The driving voltage that the electric current of thin film transistor (TFT) and the characteristic curve of voltage can calculate the initial moment is V0, in compensation moment institute
The driving voltage needed is V, then red offset voltage is V-V0.Green and blueness compensation can be calculated according to same method
Voltage.
In conclusion the AMOLED luminance compensation methods and AMOLED drive systems of the present invention, have additional including first, the
Two and the 3rd luminance sensor and compensate the compensating unit of IC and include the test of red, green and blue test pixel
Pixel unit, by first, second and the 3rd luminance sensor sense red, green and blue test pixel respectively initial
The brightness at moment and compensation moment, and then red, green and blue Organic Light Emitting Diode point can be calculated by compensating IC
The offset voltage not needed, then luminance compensation is carried out respectively to red, green and blue Organic Light Emitting Diode, it can improve
Display brightness declines the oled luminance with different colours caused by the brightness decay of Organic Light Emitting Diode
Colour cast caused by rate of decay difference, keeps the luminosity and colour gamut of AMOLED.
The above, for those of ordinary skill in the art, can be with technique according to the invention scheme and technology
Other various corresponding changes and deformation are made in design, and all these changes and deformation should all belong to the claims in the present invention
Protection domain.
Claims (10)
1. a kind of AMOLED luminance compensation methods, it is characterised in that include the following steps：
Step 1, provide an AMOLED drive systems, including：Display unit (1), the source being electrically connected with the display unit (1)
Pole driving unit (2), the drive element of the grid (3) being electrically connected with the display unit (1) and the source drive unit
(2) compensating unit (4) being electrically connected and the test picture being electrically connected with source drive unit (2) and drive element of the grid (3)
Plain unit (5)；
The test pixel unit (5) is arranged on the display unit (1) outside, including：One red test pixel (51), a green are surveyed
Try pixel (52) and a blue test pixel (53)；
The compensating unit (4) include compensation IC (41) and with the compensation IC (41) electric connection first, second and the
Three luminance sensors (42,43,44), described first, second and the 3rd luminance sensor (42,43,44) corresponding red respectively survey
Pixel (51), green test pixel (52) and blue test pixel (53) is tried to set；
Step 2, into initial moment, the source drive unit (2) and drive element of the grid (3) to display unit (1) and survey
Try pixel unit (5) and data-signal (Data) and scanning signal (Gate) are provided, light the display unit (1), red test
Pixel (51), green test pixel (52) and blue test pixel (53), described first, second and the 3rd luminance sensor
(42,43,44) gather the red test pixel (51) at initial moment, green test picture under default canonical reference grayscale respectively
Plain (52) and the brightness of blue test pixel (53), and send monochrome information to compensation IC (41), compensation IC (41) root
According to red, green in the red test pixel (51) at initial moment, green test pixel (52) and blue test pixel (53),
And the blue brightness of organic light emitting diode and the relation curve of electric current calculate the red, green and indigo plant at initial moment respectively
The driving current of color test pixel (51,52,53)；
Step 3, into compensation the moment, described first, second and the 3rd luminance sensor (42,43,44) gather a certain ash respectively
Red test pixel (51), green test pixel (52) and the brightness of blue test pixel (53) at moment are compensated under rank, and will
Monochrome information sends compensation IC (41) to, and the compensation IC (41) calculates to obtain according to gamma curve and compensated under canonical reference grayscale
The brightness of the red test pixel (51) at moment, green test pixel (52) and blue test pixel (53)；
Step 4, the compensation IC (41) are tested according to the red test pixel (51) at initial moment, green under canonical reference grayscale
The brightness of pixel (52) and blue test pixel (53) is respectively with compensating the red test pixel at moment under canonical reference grayscale
(51), the relation of the brightness of green test pixel (52) and blue test pixel (53), obtain the red at compensation moment, green,
And blue test pixel (51,52,53) be issued in canonical reference grayscale with initial moment same brightness needed for driving current
The relation of the driving current of red, green and blue test pixel (51,52,53) with the initial moment, and then benefit is calculated
Repay the red at moment, green and blue test pixel (51,52,53) be issued in canonical reference grayscale it is identical with the initial moment
Driving current needed for brightness；
Step 5, the compensation IC (41) are according to red test pixel (51), green test pixel (52) and blue test pixel
(53) characteristic curve of the electric current of driving thin film transistor (TFT) and voltage in, be calculated under canonical reference grayscale red, green and
Blue test pixel (51,52,53) reaches the driving voltage needed for same brightness at initial moment, compensation moment respectively, then
The driving voltage needed for calculating compensation moment red, green and blue test pixel (51,52,53) and initial moment are red respectively
The difference of the driving voltage of color, green and blue test pixel (51,52,53), i.e., red, green and blue offset voltage；
Source drive unit (2), is supplied in display unit (1) red, green and blue Organic Light Emitting Diode by step 6
The voltage of data-signal (Data) be modified to the sum of the voltage of former data-signal (Data) and red offset voltage, former number respectively
It is believed that the voltage and blue offset voltage of the sum of the voltage of number (Data) and green offset voltage and former data-signal (Data) it
With completion AMOLED luminance compensations.
2. AMOLED luminance compensation methods as claimed in claim 1, it is characterised in that the canonical reference grayscale is 255 ashes
Rank.
3. AMOLED luminance compensation methods as claimed in claim 1, it is characterised in that the AMOLED drive systems are also wrapped
Include：Signal interface unit (6), timing control unit (7) and power supply unit (8)；
The signal interface unit (6) is electrically connected with the timing control unit (7) and power supply unit (8)；
The timing control unit (7) and the signal interface unit (6), power supply unit (8), drive element of the grid (3) and source
Pole driving unit (2) is electrically connected；
The power supply unit (8) and the signal interface unit (6), timing control unit (7), drive element of the grid (3), source electrode
Driving unit (2), compensation IC (41), display unit (1) and test pixel unit (5) are electrically connected.
4. AMOLED luminance compensation methods as claimed in claim 1, it is characterised in that be supplied to the red test pixel
(51), the scanning signal (Gate) and data-signal (Data) reference of green test pixel (52) and blue test pixel (53)
Any pixel in display unit (1) is set.
5. AMOLED luminance compensation methods as claimed in claim 1, it is characterised in that the compensation IC (41) is built-in with initially
Red, green and blueness in the red test pixel (51) at moment, green test pixel (52) and blue test pixel (53)
The brightness of the organic light emitting diode and relation curve of electric current, gamma curve and red test pixel (51), green test picture
The electric current of driving thin film transistor (TFT) and the characteristic curve of voltage in plain (52) and blue test pixel (53).
6. a kind of AMOLED drive systems applied to AMOLED luminance compensation methods as claimed in claim 1, its feature exists
In, including：Display unit (1), the source drive unit (2) being electrically connected with the display unit (1) and the display unit
(1) be electrically connected drive element of the grid (3), with the source drive unit (2) be electrically connected compensating unit (4) and with
The test pixel unit (5) that source drive unit (2) and drive element of the grid (3) are electrically connected；
The test pixel unit (5) is arranged on the display unit (1) outside, including：One red test pixel (51), a green are surveyed
Try pixel (52) and a blue test pixel (53)；
The compensating unit (4) include compensation IC (41) and with the compensation IC (41) electric connection first, second and the
Three luminance sensors (42,43,44), described first, second and the 3rd luminance sensor (42,43,44) corresponding red respectively survey
Pixel (51), green test pixel (52) and blue test pixel (53) is tried to set；
Described first, second and the 3rd luminance sensor (42,43,44) be respectively used to collection red test pixel (51), green
Test pixel (52) and the brightness of blue test pixel (53), and monochrome information is passed into compensation IC (41)；
The compensation IC (41) be used for according to first, second and the 3rd luminance sensor (42,43,44) collect it is initial when
The brightness with the red test pixel (51) at compensation moment, green test pixel (52) and blue test pixel (53) is carved, is calculated
Red, green and blue test pixel (51,52,53) are obtained under canonical reference grayscale respectively at initial moment, compensation moment
Reach the driving current needed for same brightness, then the red, green and blue test pixel at compensation moment are calculated respectively
Driving voltage and the red, green and the driving of blue test pixel (51,52,53) at initial moment needed for (51,52,53)
The difference of voltage, i.e., red, green and blue offset voltage, pass to source electrode by red, green and blue offset voltage and drive
Moving cell (2)；
The source drive unit (2) is used to that the interior red test pixel (51) of display unit (1), green test pixel will to be supplied to
(52) voltage of the data-signal (Data) of red, green and blue Organic Light Emitting Diode and in blue test pixel (53)
Be modified to respectively the sum of the voltage of former data-signal (Data) and red offset voltage, former data-signal (Data) voltage with it is green
The sum of voltage and blue offset voltage of the sum of colorimetric compensation voltage and former data-signal (Data).
7. AMOLED drive systems as claimed in claim 6, it is characterised in that the canonical reference grayscale is 255 grayscale.
8. AMOLED drive systems as claimed in claim 6, it is characterised in that the AMOLED drive systems further include：Letter
Number interface unit (6), timing control unit (7) and power supply unit (8)；
The signal interface unit (6) is electrically connected with the timing control unit (7) and power supply unit (8)；
The timing control unit (7) and the signal interface unit (6), power supply unit (8), drive element of the grid (3) and source
Pole driving unit (2) is electrically connected；
The power supply unit (8) and the signal interface unit (6), timing control unit (7), drive element of the grid (3), source electrode
Driving unit (2), compensation IC (41), display unit (1) and test pixel unit (5) are electrically connected.
9. AMOLED drive systems as claimed in claim 6, it is characterised in that the drive element of the grid (3) to test picture
Red test pixel (51), green test pixel (52) and blue test pixel (53) in plain unit (5) provide scanning signal
(Gate), red test pixel (51), green test pixel of the source drive unit (2) into test pixel unit (5)
(52) and blue test pixel (53) provides data-signal (Data)；It is supplied to the red test pixel (51), green test
The scanning signal (Gate) and data-signal (Data) of pixel (52) and blue test pixel (53) are referred in display unit (1)
Any pixel set.
10. AMOLED drive systems as claimed in claim 6, it is characterised in that when the compensation IC (41) is built-in with initial
Red, green and blueness have in the red test pixel (51) at quarter, green test pixel (52) and blue test pixel (53)
The brightness of the machine Light-Emitting Diode and relation curve of electric current, gamma curve and red test pixel (51), green test pixel
(52) and in blue test pixel (53) electric current of thin film transistor (TFT) and the characteristic curve of voltage are driven.
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