CN103021335B - OLED (organic light emitting diode) driving circuit, OLED display device and brightness adjusting method for OLED display device - Google Patents
OLED (organic light emitting diode) driving circuit, OLED display device and brightness adjusting method for OLED display device Download PDFInfo
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Abstract
The invention belongs to the field of display technology, and particularly relates to an OLED (organic light emitting diode) driving circuit, an OLED display device and a brightness adjusting method for the OLED display device. The OLED driving circuit comprises a control unit and a driving unit, the control unit is used for calculating the average brightness of a frame image according to all sub-image data of the frame image to be displayed, reversely adjusting brightness control signals for displaying sub-images of the frame image by taking the average brightness as reference brightness and transmitting the adjusted brightness control signals to the driving unit, and the driving unit is used for receiving the adjusted brightness control signals and driving an OLED according to the adjusted brightness control signals, so that the frame image is displayed according to the adjusted brightness. The OLED driving circuit has the advantages that overall power consumption of an OLED display panel is low, and image quality is improved.
Description
Technical field
The invention belongs to display technique field, be specifically related to a kind of OLED driving circuit, OLED display, and OLED display regulates the method for brightness.
Background technology
OLED(Organic Light-Emitting Diode, Organic Light Emitting Diode) display device is a kind of emerging panel display apparatus, compare liquid crystal display (LiquidCrystal Display:LCD), OLED can autoluminescence and do not need backlight unit, therefore, think that OLED display is lower relative to power consumption LCD in general sense.
Pixel cell in OLED display comprises the multiple pixel cells arranged in the matrix form.Pixel cell is divided into passive matrix (Passive Matrix is called for short PM) type of drive and active matrix (Active Matrix is called for short AM) type of drive two kinds according to type of drive.Because AM-OLED has obvious advantage in the reductibility, power consumption and response time etc. of visible angle, color, be therefore widely used.
From expulsion mechanism, AM-OLED is a kind of circuit structure of Matrix addressing, and this circuit structure comprises thin film transistor (TFT) (Thin Film Transistor is called for short TFT), and described TFT is connected with described sub-pixel unit (i.e. OLED).Drive singal comprises the data-signal (with display information) for pixel cell provides the sweep signal of row gating, provides column selection logical, sweep signal and data-signal act on TFT simultaneously, by controlling the break-make of TFT, realize the control to the electric current of the OLED be attached thereto, thus make OLED can both be luminous in a controlled frame time, to show image to be displayed.
The task of driving circuit comprises: provide controlled current flow with driving OLED, and continues to provide electric current luminous to ensure that each sub-pixel unit continues after address period.As shown in Figure 1, the 2T1C driving circuit that in prior art, single OLED is general comprises switching tube (switching) T1(hereinafter referred to as T1), driving tube (driving) T2(is hereinafter referred to as T2) and store (storing) electric capacity Cs(hereinafter referred to as Cs).When sweep trace is selected, row gating signal Vsel makes T1 open, and data voltage Vdata is charged to Cs by T1, the drain current of the Control of Voltage T2 of Cs, and along with the grid potential of T2 improves gradually, T2 starts conducting, and steady operation is in saturation region; When sweep trace is not selected, T1 ends, and be stored in the grid voltage that electric charge on Cs continues to maintain T2, T2 keeps conducting state, therefore can maintain OLED within a frame period and be in current constant control, and needed for OLED, drive current is little, low in energy consumption.
But, in actual use, when finding the picture of the different brightness of display, there is very large difference in OLED display panel power consumption, such as: when black picture or low darkness image, do not work due to all OLED or only have a small amount of OLED in work, therefore OLED display panel consumed power hardly; And when display white picture or high-brghtness picture images, because whole OLED or most of OLED opens, and the electric current flowing through OLED is all very large, therefore OLED display panel power consumption aggravation.Have statistics to show, when OLED display and LCD show same white picture or high-brghtness picture images, the power consumption of OLED display panel is up to 4 times of power consumption of LCD.
For solving the high power problems of AM-OLED when white picture or high-brghtness picture images, application number is propose a solution in the Chinese patent application of 200610079980.4, the program is when white picture or high-brghtness picture images, the width of gated sweep signal is carried out according to the quantity of gray-scale value of display image or external environment condition brightness, adjustment OLED opens and shuts off the time, to reach the object reducing power consumption.But, because the program is by adjusting the unlatching of TFT and turning off the object reaching and reduce power consumption, and the unexpected unlatching of TFT and shutoff, image display is unstable to be easy to cause OLED display panel to occur because driving voltage is unstable, and even generation display frame shake etc. are bad.Therefore, how can make OLED display panel lower power consumption, can ensure again that image shows stable be current problem demanding prompt solution.
Summary of the invention
Technical matters to be solved by this invention is for above shortcomings in prior art, a kind of OLED driving circuit, OLED display are provided, and the method for this display device brightness regulation, this OLED display has less power consumption, and display frame is more stable.
The technical scheme that solution the technology of the present invention problem adopts is this OLED driving circuit, comprises control module and driver element, wherein:
Described control module, according to all sub-image data of a two field picture to be shown, calculate the mean flow rate of this two field picture, and using this mean flow rate as Benchmark brightness, reverse adjustment is for showing the brightness control signal of each subimage of this two field picture, and the brightness control signal after adjustment is sent to described driver element;
Described driver element, receives the brightness control signal after described adjustment, and according to the brightness control signal driving OLED after described adjustment, this two field picture is shown according to the brightness after adjustment.
Preferably, described Benchmark brightness carries out statistics by the gray-scale value of each subimage to this two field picture and draws.
Preferably, when the brightness of described subimage is greater than Benchmark brightness the first preset range, brightness control signal corresponding reduction first setting range that described control module will be used for the OLED showing this subimage.
Further preferably, described first preset range is 30%-50%, and described first setting range is 20%-40%.
Preferably, when the brightness of described subimage is less than Benchmark brightness the second preset range, brightness control signal corresponding increase second setting range that described control module will be used for the OLED showing this subimage.
Further preferably, described second preset range is 30%-50%, and described second setting range is 20%-40%.
Preferably, described driver element comprises the first driver element and the second driver element, and described first driver element and/or described second driver element are to the brightness control signal after described OLED transmission adjustment.
Wherein, the gamma grey scale curve of multiple different brackets is provided with in described first driver element, described first driver element calls corresponding gamma grey scale curve according to the brightness control signal after adjustment, and gamma electric voltage corresponding to described gray-scale value is searched in this gamma grey scale curve, this gamma electric voltage is for driving described OLED.
Include DC/DC converter in described second driver element, described second driver element adjusts the output voltage of described DC/DC converter according to the brightness control signal after adjustment, and this output voltage is for driving described OLED.
Preferably, the mode that described control module sends brightness control signal to described second driver element is pulse width modulation, and described pulse width modulation changes the output voltage of DC/DC converter by the dutycycle of regulating impulse width.
It is also preferred that, the mode that described control module sends brightness control signal to described second driver element is Serial Control mode, be provided with rheostat in described DC/DC converter, described Serial Control mode changes the output voltage of DC/DC converter by changing described rheostatic resistance.
A kind of OLED display, comprises above-mentioned driving circuit, also comprises multiple pixel cell, included OLED in each pixel cell, and the brightness control signal after described OLED receives the adjustment of described driver element output also realizes display.
A method for OLED display brightness regulation, comprising:
Step S1): according to all sub-image data of a two field picture to be shown, calculate the mean flow rate of this two field picture, and using this mean flow rate as Benchmark brightness, oppositely adjustment is for showing the brightness control signal of each subimage of this two field picture;
Step S2): according to the brightness control signal after adjustment, show this two field picture with the brightness after adjusting.
Preferably, described Benchmark brightness carries out statistics by the gray-scale value of each subimage to this two field picture and draws.
Preferably, when the brightness of described subimage is greater than Benchmark brightness the first preset range, by corresponding for the brightness control signal of this subimage reduction first setting range.
Further preferably, described first preset range is 30%-50%, and described first setting range is 20%-40%.
Preferably, when the brightness of described subimage is less than Benchmark brightness the second preset range, by corresponding for the brightness control signal of this subimage increase second setting range.
Further preferably, described second preset range is 30%-50%, and described second setting range is 20%-40%.
The invention has the beneficial effects as follows: OLED display panel overall power reduces, and image quality improves.
Accompanying drawing explanation
Figure 1 shows that OLED pixel cell general in prior art;
Figure 2 shows that gamma curve schematic diagram;
Figure 3 shows that the structural representation of OLED display in the embodiment of the present invention 1;
Fig. 4 A is depicted as the method for the brightness control signal after utilizing pulse width modulation to be adjusted in the embodiment of the present invention 1;
Fig. 4 B is depicted as PWM square-wave signal schematic diagram;
Figure 5 shows that in the embodiment of the present invention 2 method of the brightness control signal after utilizing Serial Control mode to be adjusted.
In figure: 1-pixel cell; 2-control module; 3-first driver element; 4-second driver element.
Embodiment
For making those skilled in the art understand technical scheme of the present invention better, below in conjunction with the drawings and specific embodiments to a kind of OLED driving circuit of the present invention, OLED display, and the method for OLED display brightness regulation is described in further detail.
As shown in Figure 1, in the driving circuit of OLED, because steady operation during T2 conducting is in saturation region, namely saturation current now flows through the electric current I of OLED
eL, according to the source-drain current formula of TFT saturation region, obtain the electric current I by OLED
eLfor:
I
EL=1/2*K×(Vdata-Vdd-Vth)
2…………（1）
In formula (1), K is the constant relevant with T2 structure, and Vdata is the voltage from the first driver element, and Vdd is the voltage from the second driver element, and Vth is the threshold voltage of T2.
From formula (1), by the electric current I of OLED
eLaffect by Vdata, Vdd simultaneously.Wherein, the with it corresponding voltage signal (simulating signal) of Vdata for being determined by image to be displayed (digital signal), the voltage of Vdd for being provided by DC/DC converter, and the electric current I flowing through OLED
eLdetermine its luminous intensity and its power consumption.
Here will be appreciated that, because human eye is not linear for the identification capability of light luminance, therefore vision signal frequency electronic standard association (Video Electronics StandardsAssociation, be called for short VESA) for this phenomenon, gamma value (gamma value) curve is made according to human eye characteristic, to allow the designer being engaged in display technique work can according to this brightness contrast, and the grey menu that display panel is presented becomes the display frame of the most applicable human eye viewing.But, because the gamma curve that VESA formulates is made under the environment of darkroom (darkroom) fixing, so when display panel be in surrounding environment brightness very dark time, GTG (gray level) picture identical shown by it, human eye clearly can be told and know and stratified GTG, but when display panel be in surrounding environment brightness very bright time, many close grey menu shown by it, human eye just clearly cannot tell different GTG, the chroma-luminance precision of display panel is inadequate to cause user to feel thus, and the picture shown by it can become the shortcoming such as comparatively fuzzy continues and be derived.
In view of the foregoing, technical conceive of the present invention is just, according to formula (1), changes by the size changing Vdata and/or Vdd the electric current I flowing through OLED
eLsize, namely by suitably reducing the value of Vdata and/or Vdd, reduce the display brightness of display panel entirety, thus reach the object reducing display panel power consumption.And when actual displayed, when image to be displayed is highlighted, because human eye is insensitive to brightness of image, suitably reducing brightness of image can't produce very large visual impact to observer, the impact on display effect also can not be caused.
A kind of OLED driving circuit, comprises control module and driver element, wherein:
Described control module, according to all sub-image data of a two field picture to be shown, calculate the mean flow rate of this two field picture, and using this mean flow rate as Benchmark brightness, reverse adjustment is for showing the brightness control signal of each subimage of this two field picture, and the brightness control signal after adjustment is sent to described driver element;
Described driver element, receives the brightness control signal after described adjustment, and according to the brightness control signal driving OLED after described adjustment, this two field picture is shown according to the brightness after adjustment.
A kind of OLED display, comprises above-mentioned driving circuit, also comprises multiple pixel cell, included OLED in each pixel cell, and the brightness control signal after described OLED receives the adjustment of described driver element output also realizes display.
A method for OLED display brightness regulation, comprising:
Step S1): according to all sub-image data of a two field picture to be shown, calculate the mean flow rate of this two field picture, and using this mean flow rate as Benchmark brightness, oppositely adjustment is for showing the brightness control signal of each subimage of this two field picture;
Step S2): according to the brightness control signal after adjustment, show this two field picture with the brightness after adjusting.
Embodiment 1:
In the present embodiment, OLED display comprises OLED driving circuit and multiple pixel cell, has included OLED in each pixel cell, and the brightness control signal after described OLED receives the adjustment of described driver element output also realizes display.As shown in Figure 3, OLED driving circuit comprises control module 2 and driver element, and wherein, driver element comprises the first driver element 3 and the second driver element 4, first driver element 3 is connected with OLED respectively with the second driver element 4.In OLED display, the view data of image to be displayed comprises real time video data, the image of pre-stored, graph data or other display information.
A method for OLED display brightness regulation, comprising:
Step S1): according to all sub-image data of a two field picture to be shown, calculate the mean flow rate of this two field picture, and using this mean flow rate as Benchmark brightness, oppositely adjustment is for showing the brightness control signal of each subimage of this two field picture;
Step S2): according to the brightness control signal after adjustment, show this two field picture with the brightness after adjusting.
Control module 2 is according to all sub-image data of a two field picture to be shown, calculate the mean flow rate of this two field picture, and using this mean flow rate as Benchmark brightness, reverse adjustment is for showing the brightness control signal of each subimage of this two field picture, and the brightness control signal after adjustment is sent to described driver element.Described image to be displayed comprises multiple subimage, described Benchmark brightness carries out statistics by the gray-scale value of each subimage to this two field picture and draws, for 6 position digital signals, have 64 gray-scale values, the gray-scale value of subimage is " 111111 " is maximum brightness, the gray-scale value of subimage is " 000000 " is minimum brightness, by asking for arithmetic average to the gray-scale value of each subimage, namely obtains Benchmark brightness.Certainly, Benchmark brightness also can adopt other statistical methods to calculate, such as, ask for the method for weighted mean value, in the method asking for weighted mean value, artificially can set the weight of high brightness gray-scale value and low-luminance grayscale level value, not repeat them here.
When the brightness of described subimage is greater than Benchmark brightness the first preset range, brightness control signal corresponding reduction first setting range that described control module will be used for the OLED showing this subimage; Exemplarily: described first preset range is 30%-50%, described first setting range is 20%-40%.
Further, in order to not lose the details of dark portion while reducing image display brightness, do not affect display effect, when the brightness of described subimage is less than Benchmark brightness the second preset range, brightness control signal corresponding increase second setting range that described control module will be used for the OLED showing this subimage; Exemplarily, described second preset range is 30%-50%, and described second setting range is 20%-40%.Concrete, the higher limit of the brightness range after adjustment and/or lower limit can be arranged according to actual needs flexibly.In the present embodiment, control module adopts CPU or MCU or FPGA.
Described driver element, receives the brightness control signal after described adjustment, and drives described OLED according to the brightness control signal after described adjustment, and this two field picture is shown according to the brightness after adjustment.Described driver element comprises the first driver element and second and drives, described first driver element and/or described second driver element correspond to the signal of the brightness after adjustment to described OLED transmission, with the subimage making described OLED show the brightness after correspond to adjustment.
Alternatively, the gamma grey scale curve of multiple different brackets is provided with in described first driver element, described first driver element calls corresponding gamma grey scale curve according to the brightness control signal after adjustment, and gamma electric voltage corresponding to described gray-scale value is searched in this gamma grey scale curve, described gamma electric voltage is sent to described OLED.
Wherein, the first driver element adopts driving chip (driver IC), is previously provided with the gamma grey scale curve of multiple different brackets in described driving chip.Gamma curve is a kind of special tint ramp, and image digital signal is converted to the simulating signal Vdata needed for display panel by it.The fundamental formular of gamma transformation is:
s=c(r/max?gray(num))
γ…………（2）
In formula (2), c is constant, and r is gray-scale value (r>=0), and num is the figure place (such as 2 of gray-scale value
5position, 2
6position or 2
8position), γ is gamma value, and s is light values.
As shown in Figure 2, in gamma curve figure, its longitudinal axis is the gray scale of image, and transverse axis is gray-scale value, and when gamma value equals 1 time, gamma curve is straight line, represents input gray grade value and output brightness linear correlation; And according to the apperceive characteristic of human eye to brightness, for the gamma value of display system higher than 1.
In the present embodiment, the brightness control signal after the adjustment that driving chip sends according to control module, transfer with adjust after gamma curve corresponding to brightness control signal.Exemplarily, as shown in Figure 2, during according to the gamma curve of γ=2.2 as datum curve, if the brightness control signal after adjustment is brightness reduce signal, then transfer the curve A making output darkening, if the brightness control signal after adjustment is brightness strengthen signal, then transfer the curve B making output brightening, realize gamma transformation in this way, produce different data voltage Vdata values.Such as, in fig. 2, when the gamma curve of corresponding γ=2.2 of the gamma grade preset in this driver element, be the brightness of a point of 32 for gray-scale value in Fig. 2, correspondingly the brightness control signal of its correspondence can be adjusted to the brightness of the b point on the gamma curve of corresponding γ=3.0 of gamma grade, to reduce the display brightness of image.
Alternatively, be provided with a gamma grey scale curve in described first driver element, described first driver element directly searches corresponding gamma electric voltage according to the brightness control signal after adjustment, and described gamma electric voltage is sent to described OLED.Exemplarily, as shown in Figure 2, be the brightness of a point of 32 for gray-scale value, the brightness control signal of its correspondence be adjusted to the brightness of the c point of same gamma grade.
Include DC/DC converter in described second driver element, described second driver element adjusts the output voltage of described DC/DC converter according to the brightness control signal after adjustment, generates corresponding Vdd, Vss voltage signal.PMOS TFT, Vdd are sent to the source electrode of OLED driving transistors T2, the drain electrode of T2 is connected with the positive pole of OLED, and Vss is sent to the negative pole of OLED.That is, when this two field picture is brighter, the Vdd value before making the Vdd value after adjustment be less than adjustment relatively; Such as, when the brightness of described subimage is greater than Benchmark brightness the first preset range, brightness control signal corresponding reduction first setting range that described control module will be used for the OLED showing this subimage; Exemplarily: described first preset range is 30%-50%, described first setting range is 20%-40%.
Further, in order to not lose the details of dark portion while reducing image display brightness, do not affect display effect, when this two field picture is darker, the Vdd value before making the Vdd value after adjustment be greater than adjustment relatively.Such as, when the brightness of described subimage is less than Benchmark brightness the second preset range, brightness control signal corresponding increase second setting range that described control module will be used for the OLED showing this subimage; Exemplarily, described second preset range is 30%-50%, and described second setting range is 20%-40%.
In the present embodiment, the mode that described control module sends brightness control signal to described second driver element is pulse-length modulation (Pulse Width Modulation:PWM) mode, namely described pulse width modulation is by the dutycycle D(duty ratio of regulating impulse width) change the output voltage Vout of DC/DC converter, thus the size of Vdd voltage in change OLED display panel on T2, as shown in Figure 4 A, PWM square-wave signal as shown in Figure 4 B for concrete circuit diagram.In figure 4b, the ratio of the cycle of PWM square-wave signal is T, dutycycle D to be signal be high level time T 0 and cycle T.The output voltage Vout of DC/DC converter is directly proportional to the dutycycle D of PWM square wave, and formula is as follows:
Vdd=Vout=D×Vin…………（3）
In formula (3), Vin is the Vdd value corresponding to the brightness before can showing the adjustment of this two field picture, changes D and can reach the object changing Vdd.
Keep Vdata constant when white picture or high-brghtness picture images, and reduce Vdd value, the size being namely equivalent to aperture during the T2 conducting of OLED driving transistors is constant, but can make the electric current I flowing through each OLED
eldiminish accordingly, thus picture brightness is reduced relatively, and the lower power consumption of single OLED, and then reach the object of the lower power consumption making whole OLED display panel; Keep Vdata constant when black picture or low darkness image, and increase Vdd value, the size being namely equivalent to aperture during the T2 conducting of OLED driving transistors is constant, but can make the electric current I flowing through each OLED
eLcorresponding increase, thus picture brightness is improved relatively, the display effect of OLED display panel is improved.
In the present embodiment, the brightness of mode to image to the first driver element and the second driver element adjust simultaneously is adopted to adjust.Because the power consumption of OLED is mainly by the electric current I flowing through OLED
eLsize determine, according to formula (1), when (Vdata-Vdd) changes, cause the electric current I flowing through OLED accordingly
eLsize change.But, (Vdata-Vdd) entirety after ensureing adjustment for reduce trend time, when showing this two field picture, overall brightness is larger even by obtaining.Above-mentioned Vdd, Vdata and row gating signal Vsel(and prior art control signal with) make OLED continue to light in a frame time, and show this two field picture according to the brightness after adjustment, thus reach the overall power reducing AM-OLED display panel, the object improving image quality.
Embodiment 2:
The difference of the present embodiment and embodiment 1 is, mode for Vdd adjustment in the present embodiment is different from embodiment 1, in the present embodiment, the mode that described control module sends brightness control signal to described second driver element is Serial Control mode, rheostat is provided with in described DC/DC converter, described Serial Control mode changes the output voltage of DC/DC converter by changing described rheostatic resistance, concrete circuit diagram as shown in Figure 5.
In Fig. 5, DC/DC converter comprises rheostat, and rheostatic output is Vdd.Control module is sent in the brightness regulated signal of DC/DC converter and includes rheostat resistance information (being such as ratio information), second driver element obtains different dividing potential drops according to this rheostat information to rheostatic resistance adjustment, and this dividing potential drop is sent to the source electrode of T2.In the present embodiment, changed the size of Vdd voltage by the resistance changing resistance R1, described rheostatic output voltage Vdd is directly proportional to described intrinsic standoff ratio, and concrete relational expression is:
Vdd=Vout × intrinsic standoff ratio=Vout × [R2/(R1+R2)] ... (4)
In formula (4), R1, R2 can obtain suitable ratio by voltage according to actual needs, and intrinsic standoff ratio is determined by the brightness control signal of control module.
In the present embodiment, the structure of OLED display is identical with embodiment 1, repeats no more here.
Embodiment 3:
The difference of the present embodiment and embodiment 1 is, the present embodiment only adopts the mode of the Vdata size exported in adjustment first driver element to regulate the brightness of image.
In the present embodiment, the adjustment mode of Vdata is identical with embodiment 1, that is, when this two field picture is brighter, and the Vdata value before making the Vdata value after adjustment be less than adjustment relatively; When this two field picture is darker, the Vdata value before making the Vdata value after adjustment be greater than adjustment relatively.Like this, according to formula (1), when Vdata changes, flow through the electric current I of OLED
eLsize and Vdata there is the change of same trend.That is, when Vdata reduces, corresponding I
eLreduce, then image frame brightness reduces, and the overall power of OLED display panel reduces; When Vdata increases, image frame brightness increases, and image quality improves.
In the present embodiment, the structure of OLED display is identical with embodiment 1, repeats no more here.
Embodiment 4:
The difference of the present embodiment and embodiment 1 is, the present embodiment only adopts the mode of the Vdd size exported in adjustment second driver element to regulate the brightness of image.Under this control mode, will there is same variation tendency in the brightness of the same two field picture after adjustment.
In the present embodiment, for the adjustment mode of Vdd, any one mode of the pulse width modulation in embodiment 1 or the Serial Control mode in embodiment 2 can be adopted.In the present embodiment, keep Vdata constant, and reduce Vdd value when white picture or high-brghtness picture images, the size being namely equivalent to aperture during T2 conducting is constant, but can make the electric current I flowing through each OLED
eldiminish accordingly, thus picture brightness is reduced relatively, and the lower power consumption of single OLED, and then reach the object of the lower power consumption making whole OLED display panel; Keep Vdata constant when black picture or low darkness image, and increase Vdd value, the size being namely equivalent to aperture during T2 conducting is constant, but can make the electric current I flowing through each OLED
eLcorresponding increase, thus picture brightness is improved relatively, the display quality of OLED display panel is improved.
In the present embodiment, the structure of OLED display is identical with embodiment 1, repeats no more here.
Embodiment 1-4 is according to the statistics of the gray-scale value data of image to be displayed, adjustment driving chip and/or DC/DC converter output to the voltage of T2, by the unlatching of control TFT or turn off and reduce power consumption and the mode that causes display frame to be shaken compared to existing technology, embodiments of the invention do not need to repeat to open or turn off TFT, but the brightness by regulating the mode of Vdata and/or the Vdd size put on TFT to regulate image, the shake of display frame is avoided while regulating brightness of image, both display panel power consumption had been reduced, the display quality of OLED display panel can also be improved.
It should be understood that the brightness adjusting method of OLED display of the present invention is not only suitable for the OLED pixel cell of the 2T1C structure analyzed in each embodiment simultaneously, be also applicable to the OLED pixel cell improved in 2T1C structure simultaneously.
Be understandable that, the illustrative embodiments that above embodiment is only used to principle of the present invention is described and adopts, but the present invention is not limited thereto.For those skilled in the art, without departing from the spirit and substance in the present invention, can make various modification and improvement, these modification and improvement are also considered as protection scope of the present invention.
Claims (17)
1. an OLED driving circuit, comprises control module and driver element, it is characterized in that,
Described control module, according to all sub-image data of a two field picture to be shown, calculate the mean flow rate of this two field picture, and using this mean flow rate as Benchmark brightness, reverse adjustment is for showing the brightness control signal of each subimage of this two field picture, and the brightness control signal after adjustment is sent to described driver element;
Described driver element, receives the brightness control signal after described adjustment, and according to the brightness control signal driving OLED after described adjustment;
Described driver element comprises the first driver element and the second driver element, and described second driver element transmits Vdd signal according to the brightness control signal after described adjustment to described OLED; Or,
Described second driver element transmits Vdd signal according to the brightness control signal after described adjustment to described OLED, described first driver element also transmits Vdata signal according to the brightness control signal after described adjustment to described OLED simultaneously, and this two field picture is shown according to the brightness after adjustment.
2. driving circuit according to claim 1, is characterized in that, described Benchmark brightness carries out statistics by the gray-scale value of each subimage to this two field picture and draws.
3. driving circuit according to claim 2, is characterized in that, when the brightness of described subimage is greater than Benchmark brightness the first preset range, and brightness control signal corresponding reduction first setting range that described control module will be used for the OLED showing this subimage.
4. driving circuit according to claim 3, is characterized in that, described first preset range is 30%-50%, and described first setting range is 20%-40%.
5. driving circuit according to claim 2, is characterized in that, when the brightness of described subimage is less than Benchmark brightness the second preset range, and brightness control signal corresponding increase second setting range that described control module will be used for the OLED showing this subimage.
6. driving circuit according to claim 5, is characterized in that, described second preset range is 30%-50%, and described second setting range is 20%-40%.
7. driving circuit according to claim 1, it is characterized in that, the gamma grey scale curve of multiple different brackets is provided with in described first driver element, described first driver element calls corresponding gamma grey scale curve according to the brightness control signal after adjustment, and gamma electric voltage corresponding to described gray-scale value is searched in this gamma grey scale curve, this gamma electric voltage is for driving described OLED.
8. driving circuit according to claim 7, it is characterized in that, include DC/DC converter in described second driver element, described second driver element adjusts the output voltage of described DC/DC converter according to the brightness control signal after adjustment, and this output voltage is for driving described OLED.
9. driving circuit according to claim 8, it is characterized in that, the mode that described control module sends brightness control signal to described second driver element is pulse width modulation, and described pulse width modulation changes the output voltage of DC/DC converter by the dutycycle of regulating impulse width.
10. driving circuit according to claim 8, it is characterized in that, the mode that described control module sends brightness control signal to described second driver element is Serial Control mode, be provided with rheostat in described DC/DC converter, described Serial Control mode changes the output voltage of DC/DC converter by changing described rheostatic resistance.
11. 1 kinds of OLED display, comprise the arbitrary described driving circuit of claim 1-10, it is characterized in that, also comprise multiple pixel cell, included OLED in each pixel cell, the brightness control signal after described OLED receives the adjustment of described driver element output also realizes display.
The method of 12. 1 kinds of OLED display brightness regulation, is characterized in that, comprising:
Step S1): according to all sub-image data of a two field picture to be shown, calculate the mean flow rate of this two field picture, and using this mean flow rate as Benchmark brightness, oppositely adjustment is for showing the brightness control signal of each subimage of this two field picture;
Step S2): receive the brightness control signal after described adjustment, and according to the brightness control signal after adjustment, transmit Vdd signal according to the brightness control signal after described adjustment to described OLED; Or, transmit Vdd signal according to the brightness control signal after described adjustment to described OLED, also transmit Vdata signal according to the brightness control signal after described adjustment to described OLED simultaneously, show this two field picture with the brightness after adjusting.
13. methods according to claim 12, is characterized in that, described Benchmark brightness carries out statistics by the gray-scale value of each subimage to this two field picture and draws.
14. methods according to claim 13, is characterized in that, when the brightness of described subimage is greater than Benchmark brightness the first preset range, by corresponding for the brightness control signal of this subimage reduction first setting range.
15. methods according to claim 14, is characterized in that, described first preset range is 30%-50%, and described first setting range is 20%-40%.
16. methods according to claim 13, is characterized in that, when the brightness of described subimage is less than Benchmark brightness the second preset range, by corresponding for the brightness control signal of this subimage increase second setting range.
17. methods according to claim 16, is characterized in that, described second preset range is 30%-50%, and described second setting range is 20%-40%.
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