CN103280188B - OLED compensation of ageing system and method - Google Patents

OLED compensation of ageing system and method Download PDF

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Publication number
CN103280188B
CN103280188B CN201310236318.5A CN201310236318A CN103280188B CN 103280188 B CN103280188 B CN 103280188B CN 201310236318 A CN201310236318 A CN 201310236318A CN 103280188 B CN103280188 B CN 103280188B
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oled
film transistor
tft
voltage
thin film
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CN103280188A (en
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于奇
颜义民
童振霄
李鹏
宁宁
王海
王超
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University of Electronic Science and Technology of China
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Abstract

The present invention relates to the technology of display panel.The invention solves in existing OLED compensation of ageing system needs processor to carry out calculating the problem just carrying out compensation of ageing, provide a kind of OLED compensation of ageing system and method, its technical scheme can be summarized as: OLED compensation of ageing system, by the first power supply, second source and reference power source input end connect respectively at OLED pixel circuit, analog to digital converter is connected with OLED pixel circuit, controller is connected with analog to digital converter, storer is connected with controller, GAMMA correction module is connected with storer, picture signal input end is connected with GAMMA correction module, source drive module is connected with GAMMA correction module, source drive module and OLED pixel circuit connect to form.The invention has the beneficial effects as follows, no longer take processor resource, be applicable to OLED compensation of ageing.

Description

OLED compensation of ageing system and method
Technical field
The present invention relates to the technology of display panel, particularly the technology of OLED compensation of ageing in AMOLED display panel.
Background technology
At present, TFT-LCD is the main product of flat display field, but displayer has lower power consumption, faster refresh rate compared with LCD display, larger visual angle, low temperature tolerance characteristics are good, screen body is frivolous and do not need the advantages such as backlight, thus displayer most development potentiality in New flat panel display.
General, displayer needs numerical monitor information processor or external interface sent here by display driver chip to be converted to simulating signal to come image element circuit on control panel and then display image.The nonlinear photoelectric characteristic of OLED can cause bad impact to display effect, therefore GAMMA voltage generating module is integrated with in driving chip, produce corrected GAMMA voltage, eliminate the impact of OLED nonlinear optical electrical characteristics with this, real image is shown as far as possible really.
The brightness of OLED increases with the current density flow through and increases, the main technology adopted controls the electric current by OLED by the voltage of the driving tube in the pixel-driving circuit be made up of thin film transistor (TFT) in coding AMOLED display panel thus controls the display brightness of sub-pix point at present, even if but the aging rear electric current flowing through formed objects of OLED, the brightness of OLED luminescence also can decline compared with new pixel, so the curve response that aging rear OLED corresponds to pixel-driving circuit changes.
Therefore uneven except needing the display that causes because TFT does not mate display panel, and beyond the aging display effect caused of TFT is deteriorated and compensates, also need the compensation of ageing of OLED own.
And in the system of the compensation of ageing of OLED own in prior art, general employing detected parameters, buffer memory detected parameters also calculates corresponding compensation of ageing parameter by processor, the compensation of ageing of OLED is carried out again according to the compensation of ageing parameter calculated, but calculate compensation of ageing parameter by processor relatively to bother, and owing to all detected parameters being calculated by processor at every turn, extremely take processor resource.
Summary of the invention
The object of the invention is will overcome in current OLED compensation of ageing system needs processor to carry out calculating the shortcoming just carrying out compensation of ageing, provides a kind of OLED compensation of ageing system and method.
The present invention solves its technical matters, the technical scheme adopted is, OLED compensation of ageing system, comprise reference power source input end, OLED pixel circuit, first power supply and second source, described first power supply, second source and reference power source input end connect respectively at OLED pixel circuit, OLED pixel circuit comprises OLED, it is characterized in that, also comprise analog to digital converter, controller, storer, GAMMA correction module, picture signal input end and source drive module, described analog to digital converter is connected with OLED pixel circuit, controller is connected with analog to digital converter, storer is connected with controller, GAMMA correction module is connected with storer, picture signal input end is connected with GAMMA correction module, source drive module is connected with GAMMA correction module, source drive module is connected with OLED pixel circuit,
It is be transferred to controller after numerical code by the Section Point voltage transitions detected that described analog to digital converter is used for, and described Section Point voltage is the anode voltage of OLED when detection-phase provides electric current by reference power source input end;
Described controller is used for according to the data reading in the numerical code control store of the next Section Point voltage of analog to digital converter transmission to GAMMA correction module;
Store each reference voltage dot information of GAMMA curve under different degree of aging in described storer, select corresponding reference voltage dot information to export to GAMMA correction module according to the control of controller;
Described picture signal input end is used for GAMMA correction module received image signal;
The different reference voltage dot informations that described GAMMA correction module is used for coming according to memory transfer produce some grayscale voltages corresponding with received image signal as the image data information being converted to simulating signal, and are transferred to source drive module;
The image data information of the simulating signal that the transmission of GAMMA correction module comes is pushed to OLED pixel circuit by described source drive module, and then driving OLED device is luminous.
Concrete, described OLED pixel circuit comprises the first film transistor, second thin film transistor (TFT), 3rd thin film transistor (TFT), 4th thin film transistor (TFT), 5th thin film transistor (TFT), 6th thin film transistor (TFT), OLED, electric capacity, first control signal input end, second control signal input end, 3rd control signal input end, 4th control signal input end and the 5th control signal input end, the grid of described the first film transistor is connected with the first control signal input end, source electrode is connected with source drive module, drain electrode is connected by the drain electrode of electric capacity with the second thin film transistor (TFT), and be connected with the grid of the 3rd thin film transistor (TFT), the grid of the second thin film transistor (TFT) is connected with the second control signal input end, the source electrode of the second thin film transistor (TFT) is connected with the drain electrode of the 3rd thin film transistor (TFT), the source electrode of the 3rd thin film transistor (TFT) is connected with the first power supply, the grid of the 4th thin film transistor (TFT) is connected with the 3rd control signal input end, its source electrode is connected with the drain electrode of the 3rd thin film transistor (TFT), drain electrode is connected with the anode of OLED, the grid of the 5th thin film transistor (TFT) is connected with the 5th control signal input end, its source electrode is connected with the anode of OLED, drain electrode is connected with analog to digital converter, the grid of the 6th thin film transistor (TFT) is connected with the 4th control signal input end, its source electrode is connected with reference power source input end, drain electrode is connected with the anode of OLED, the negative electrode of OLED is connected with second source.
Further, store in described storer under different degree of aging in each reference voltage dot information of GAMMA curve, each reference voltage dot information of described GAMMA curve comprises the highest reference voltage of GAMMA.
OLED aging compensation approach, is characterized in that, comprises the steps:
Step 1, store the GAMMA curve reference voltage dot information adapted under different degree of aging in memory;
Step 2, detect the anode voltage of OLED when providing electric current by reference power source input end, and be that numerical code is transferred to controller by the voltage transitions of detection;
Data in step 3, controller control store, GAMMA curve reference voltage dot information corresponding in selection memory reads to GAMMA correction module;
Step 4, GAMMA correction module adjustment GAMMA curve with make the gray scale of signal voltage adapt to aging after the brightness change of OLED.
Concrete, in step 1, the acquisition methods of the GAMMA curve reference voltage dot information adapted under described different degree of aging is:
Step 101, screen production firm provide the different voltage corresponding to degree of aging of OLED under constant current conditions and brightness;
Step 102, by the ratio of calculating current density with brightness, obtain the value of corresponding each reference voltage point according to this ratio calculation.
The invention has the beneficial effects as follows, in the present invention program, by above-mentioned OLED compensation of ageing system and method, system is not needed to be connected the compensation of ageing that can realize OLED with processor, no longer take processor resource, improve the operational efficiency of total system.
Accompanying drawing explanation
Fig. 1 is the system chart of OLED compensation of ageing system of the present invention.
Fig. 2 is the sequential chart of embodiment of the present invention OLED compensation of ageing system sub-pixel one-period.
The equivalent circuit diagram of OLED compensation of ageing system of the present invention when Fig. 3 is T1 stage in Fig. 2.
The equivalent circuit diagram of OLED compensation of ageing system of the present invention when Fig. 4 is T2 stage in Fig. 2.
The equivalent circuit diagram of OLED compensation of ageing system of the present invention when Fig. 5 is T3 stage in Fig. 2.
Wherein, C is electric capacity, ELVDD is the first power supply, ELVSS is second source, and OLED is OLED, and N1 is first node, N2 is Section Point, M1 is the first film transistor, and M2 is the second thin film transistor (TFT), and M3 is the 3rd thin film transistor (TFT), M4 is the 4th thin film transistor (TFT), M5 is the 5th thin film transistor (TFT), and M6 is the 6th thin film transistor (TFT), and S1 is the first control signal input end, S2 is the second control signal input end, S3 is the 3rd control signal input end, and S4 is the 4th control signal input end, and S5 is the 5th control signal input end.
Embodiment
Below in conjunction with embodiment and accompanying drawing, describe technical scheme of the present invention in detail.
The system chart of OLED compensation of ageing system of the present invention is as Fig. 1.OLED compensation of ageing system of the present invention, comprise reference power source input end, OLED pixel circuit, first power supply ELVDD, second source ELVSS, analog to digital converter, controller, storer, GAMMA correction module, picture signal input end and source drive module, first power supply ELVDD, second source and reference power source input end connect respectively at OLED pixel circuit, OLED pixel circuit comprises OLED, analog to digital converter is connected with OLED pixel circuit, controller is connected with analog to digital converter, storer is connected with controller, GAMMA correction module is connected with storer, picture signal input end is connected with GAMMA correction module, source drive module is connected with GAMMA correction module, source drive module is connected with OLED pixel circuit, wherein, it is be transferred to controller after numerical code that analog to digital converter is used for the Section Point voltage transitions detected, described Section Point N2 voltage is the anode voltage of OLED when detection-phase provides electric current by reference power source input end, controller is used for according to the data reading in the numerical code control store of the next Section Point N2 voltage of analog to digital converter transmission to GAMMA correction module, store each reference voltage dot information of GAMMA curve under different degree of aging in storer, select corresponding reference voltage dot information to export to GAMMA correction module according to the control of controller, picture signal input end is used for GAMMA correction module received image signal, the different reference voltage dot informations that GAMMA correction module is used for coming according to memory transfer produce some grayscale voltages corresponding with received image signal as the image data information being converted to simulating signal, and are transferred to source drive module, the image data information of the simulating signal that the transmission of GAMMA correction module comes is pushed to OLED pixel circuit by source drive module, and then driving OLED device is luminous.
In OLED aging compensation approach of the present invention, first the GAMMA curve reference voltage dot information adapted under storing in memory different degree of aging, during detection, detect the anode voltage of OLED when providing electric current by reference power source input end, and be that numerical code is transferred to controller by the voltage transitions of detection, the data of controller again in control store, GAMMA curve reference voltage dot information corresponding in selection memory reads to GAMMA correction module, finally by GAMMA correction module adjust GAMMA curve with make the gray scale of signal voltage adapt to aging after the brightness of OLED change.
Embodiment
The system chart of the OLED compensation of ageing system of the embodiment of the present invention is as Fig. 1.OLED compensation of ageing system of the present invention, comprise reference power source input end, OLED pixel circuit, first power supply ELVDD, second source ELVSS, analog to digital converter, controller, storer, GAMMA correction module, picture signal input end and source drive module, first power supply ELVDD, second source ELVSS and reference power source input end connect respectively at OLED pixel circuit, OLED pixel circuit comprises OLED, analog to digital converter is connected with OLED pixel circuit, controller is connected with analog to digital converter, storer is connected with controller, GAMMA correction module is connected with storer, picture signal input end is connected with GAMMA correction module, source drive module is connected with GAMMA correction module, source drive module is connected with OLED pixel circuit, wherein, it is be transferred to controller after numerical code that analog to digital converter is used for the Section Point N2 voltage transitions detected, described Section Point N2 voltage is the anode voltage of OLED when detection-phase provides electric current by reference power source input end, controller is used for according to the data reading in the numerical code control store of the next Section Point voltage of analog to digital converter transmission to GAMMA correction module, each reference voltage dot information of GAMMA curve under different degree of aging is stored in storer, select corresponding reference voltage dot information to export to GAMMA correction module according to the control of controller, each reference voltage dot information of this GAMMA curve comprises the highest reference voltage of GAMMA, picture signal input end is used for GAMMA correction module received image signal, the different reference voltage dot informations that GAMMA correction module is used for coming according to memory transfer produce some grayscale voltages corresponding with received image signal as the image data information being converted to simulating signal, and are transferred to source drive module, the image data information of the simulating signal that the transmission of GAMMA correction module comes is pushed to OLED pixel circuit by source drive module, and then driving OLED device is luminous.
In this example, OLED pixel circuit comprises the first film transistor M1, second thin film transistor (TFT) M2, 3rd thin film transistor (TFT) M3, 4th thin film transistor (TFT) M4, 5th thin film transistor (TFT) M5, 6th thin film transistor (TFT) M6, OLED, electric capacity C, first control signal input end S1, second control signal input end S2, 3rd control signal input end S3, 4th control signal input end S4 and the 5th control signal input end S5, the grid of described the first film transistor M1 is connected with the first control signal input end S1, source electrode is connected with source drive module, drain electrode is connected with the drain electrode of the second thin film transistor (TFT) M2 by electric capacity C, and be connected with the grid of the 3rd thin film transistor (TFT) M3, the grid of the second thin film transistor (TFT) M2 is connected with the second control signal input end S2, the source electrode of the second thin film transistor (TFT) M2 is connected with the drain electrode of the 3rd thin film transistor (TFT) M3, the source electrode of the 3rd thin film transistor (TFT) M3 is connected with the first power supply ELVDD, the grid of the 4th thin film transistor (TFT) M4 is connected with the 3rd control signal input end S3, its source electrode is connected with the drain electrode of the 3rd thin film transistor (TFT) M3, drain electrode is connected with the anode of OLED, the grid of the 5th thin film transistor (TFT) M5 is connected with the 5th control signal input end S5, its source electrode is connected with the anode of OLED, drain electrode is connected with analog to digital converter, the grid of the 6th thin film transistor (TFT) M6 is connected with the 4th control signal input end S4, its source electrode is connected with reference power source input end, drain electrode is connected with the anode of OLED, the negative electrode of OLED is connected with second source ELVSS.
During use, first the GAMMA curve reference voltage dot information adapted under storing in memory different degree of aging, the acquisition methods of the GAMMA curve reference voltage dot information adapted under this different degree of aging for: first provide voltage corresponding to the different degree of aging of OLED under constant current conditions and brightness by screen production firm, again by calculating current density and the ratio of brightness, obtain the value of corresponding each reference voltage point according to this ratio calculation; During detection, detect the anode voltage of OLED when providing electric current by reference power source input end, and be that numerical code is transferred to controller by the voltage transitions of detection, the data of controller again in control store, GAMMA curve reference voltage dot information corresponding in selection memory reads to GAMMA correction module, finally by GAMMA correction module adjust GAMMA curve with make the gray scale of signal voltage adapt to aging after the brightness of OLED change.
Be exemplified below during carrying out practically: in this example, as shown in Figure 2, this example is divided into T1, T2 and T3 three phases to the sequential chart of OLED compensation of ageing system sub-pixel one-period in the one-period of sub-pixel.First stage is ageing management and the compensation that the compensated stage of the 3rd film crystal pipe threshold in OLED pixel circuit carries out OLED simultaneously; Subordinate phase, picture signal produces signal imitation signal voltage by the GAMMA curve after adjustment and is pushed to panel (OLED pixel circuit), is stored in electric capacity C; Namely phase III is luminescence display stage of OLED.The working condition of three phases circuit will be introduced in detail below.
Be T1 stage equivalent circuit diagram as shown in Figure 3, this stage detects Section Point N2 voltage and adjustment to GAMMA curve, simultaneously OLED pixel circuit partial-compensation the 3rd thin film transistor (TFT) M3 threshold value.Now, the second, the 4th and the 5th control signal is low level, the 2nd M2, the 5th M5 and the 6th thin film transistor (TFT) M6 conducting; First and the 3rd control signal be high level, a M1 and the 4th thin film transistor (TFT) M4 ends; Therefore, the T1 stage does not have picture signal to input GAMMA correction module, the 3rd thin film transistor (TFT) M3 conducting but leakage current is zero, deducts the 3rd thin film transistor (TFT) M3 threshold value (ELVDD-V so the 3rd thin film transistor (TFT) M3 grid potential is the first power supply ELVDD th_M3); Simultaneously, the electric current that reference power source input end provides passes through OLED, the Section Point N2 voltage transitions detected is binary digital code by analog to digital converter, output to controller, then controller OPADD information, from storer, read the information corresponding to GAMMA reference voltage point under the aging condition be detected, by GAMMA correction module adjustment GAMMA curve, and wait for the input of view data.
T2 stage circuit isoboles as shown in Figure 4, this is the stage to the 3rd thin film transistor (TFT) M3 grid received image signal voltage, as shown in Figure 2, first control signal is low level, the first film transistor M1 conducting, image signal voltage Vdata after adjustment is input to panel (OLED pixel circuit), makes the voltage of electric capacity C be ELVDD-V th_M3-Vdata, then Vdata becomes low level, because the voltage of electric capacity C can not suddenly change, so the current potential of the 3rd thin film transistor (TFT) M3 grid becomes ELVDD-V th_M3-Vdata; Second control signal, the 3rd control signal, the 4th control signal and the 5th control signal are high level, 2nd M2, the 4th M4, the 5th M5 and the 6th thin film transistor (TFT) M6 end, there is no electric current by OLED, completed the aging detection of OLED and the adjustment to GAMMA curve in the T1 stage.
The T3 stage as shown in Figure 5, this stage is the glow phase of OLED, as shown in Figure 2, first, second, the 4th and the 5th control signal is high level, one M1, the 2nd M2, the 5th M5 and the 6th thin film transistor (TFT) M6 end, 3rd control signal is low level, the 4th thin film transistor (TFT) M4 conducting, and now electric capacity C makes the current potential of the 3rd thin film transistor (TFT) M3 grid (i.e. first node N1) remain ELVDD-V th_M3-Vdata, what the 3rd thin film transistor (TFT) M3 produced drives current through OLED, and OLED keeps luminous.
The compensation method that the present invention adopts, by being stored in storer by the GAMMA curve reference voltage dot information corresponding to each aging for OLED degree, regulates whole GAMMA curve to cause its luminance deviation to compensate because OLED is aging after tested.The information of voltage detected all need not be input in processor at every turn calculate by this compensation way, simplifies the process of compensation.
Those of ordinary skill in the art will appreciate that, example described here is to help reader understanding's principle of the present invention, should be understood to that protection scope of the present invention is not limited to and so special statement and example.Above embodiment is only in order to illustrate technical scheme of the present invention.Those of ordinary skill in the art should be appreciated that and can modify to the technical scheme in this direction or equivalent replacement, and does not depart from the spirit and scope of our surface technology scheme, all should be encompassed in the middle of the scope of the present invention.

Claims (5)

1.OLED device aging bucking-out system, comprise reference power source input end, OLED pixel circuit, first power supply and second source, described first power supply, second source and reference power source input end are connected with OLED pixel circuit respectively, OLED pixel circuit comprises OLED, it is characterized in that, also comprise analog to digital converter, controller, storer, GAMMA correction module, picture signal input end and source drive module, described analog to digital converter is connected with OLED pixel circuit, controller is connected with analog to digital converter, storer is connected with controller, GAMMA correction module is connected with storer, picture signal input end is connected with GAMMA correction module, source drive module is connected with GAMMA correction module, source drive module is connected with OLED pixel circuit,
It is be transferred to controller after numerical code by the Section Point voltage transitions detected that described analog to digital converter is used for, and described Section Point voltage is the anode voltage of OLED when detection-phase provides electric current by reference power source input end;
Described controller is used for according to the data reading in the numerical code control store of the next Section Point voltage of analog to digital converter transmission to GAMMA correction module;
Store each reference voltage dot information of GAMMA curve under different degree of aging in described storer, select corresponding reference voltage dot information to export to GAMMA correction module according to the control of controller;
Described picture signal input end is used for GAMMA correction module received image signal;
The different reference voltage dot informations that described GAMMA correction module is used for coming according to memory transfer produce some grayscale voltages corresponding with received image signal as the image data information being converted to simulating signal, and are transferred to source drive module;
The image data information of the simulating signal that the transmission of GAMMA correction module comes is pushed to OLED pixel circuit by described source drive module, and then driving OLED device is luminous.
2. OLED compensation of ageing system as claimed in claim 1, it is characterized in that, described OLED pixel circuit comprises the first film transistor, second thin film transistor (TFT), 3rd thin film transistor (TFT), 4th thin film transistor (TFT), 5th thin film transistor (TFT), 6th thin film transistor (TFT), OLED, electric capacity, first control signal input end, second control signal input end, 3rd control signal input end, 4th control signal input end and the 5th control signal input end, the grid of described the first film transistor is connected with the first control signal input end, source electrode is connected with source drive module, drain electrode is connected by the drain electrode of electric capacity with the second thin film transistor (TFT), and be connected with the grid of the 3rd thin film transistor (TFT), the grid of the second thin film transistor (TFT) is connected with the second control signal input end, the source electrode of the second thin film transistor (TFT) is connected with the drain electrode of the 3rd thin film transistor (TFT), the source electrode of the 3rd thin film transistor (TFT) is connected with the first power supply, the grid of the 4th thin film transistor (TFT) is connected with the 3rd control signal input end, its source electrode is connected with the drain electrode of the 3rd thin film transistor (TFT), drain electrode is connected with the anode of OLED, the grid of the 5th thin film transistor (TFT) is connected with the 5th control signal input end, its source electrode is connected with the anode of OLED, drain electrode is connected with analog to digital converter, the grid of the 6th thin film transistor (TFT) is connected with the 4th control signal input end, its source electrode is connected with reference power source input end, drain electrode is connected with the anode of OLED, the negative electrode of OLED is connected with second source.
3. OLED compensation of ageing system as claimed in claim 1 or 2, it is characterized in that, store in described storer under different degree of aging in each reference voltage dot information of GAMMA curve, each reference voltage dot information of described GAMMA curve comprises the highest reference voltage of GAMMA.
The compensation method of 4.OLED device aging, is characterized in that, comprise the steps:
Step 1, store the GAMMA curve reference voltage dot information adapted under different degree of aging in memory;
Step 2, detect the anode voltage of OLED when providing electric current by reference power source input end, and be that numerical code is transferred to controller by the voltage transitions of detection;
Data in step 3, controller control store, GAMMA curve reference voltage dot information corresponding in selection memory reads to GAMMA correction module;
Step 4, GAMMA correction module adjustment GAMMA curve with make the gray scale of signal voltage adapt to aging after the brightness change of OLED.
5. OLED aging compensation approach as claimed in claim 4, it is characterized in that, in step 1, the acquisition methods of the GAMMA curve reference voltage dot information adapted under described different degree of aging is:
Step 101, screen production firm provide the different voltage corresponding to degree of aging of OLED under constant current conditions and brightness;
Step 102, by the ratio of calculating current density with brightness, obtain the value of corresponding each reference voltage point according to this ratio calculation.
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