CN103730090A - Circuit and method for digital compensation correction of OLED luminous efficiency attenuation - Google Patents
Circuit and method for digital compensation correction of OLED luminous efficiency attenuation Download PDFInfo
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- CN103730090A CN103730090A CN201410015034.8A CN201410015034A CN103730090A CN 103730090 A CN103730090 A CN 103730090A CN 201410015034 A CN201410015034 A CN 201410015034A CN 103730090 A CN103730090 A CN 103730090A
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Abstract
The invention discloses a method for digital compensation correction of OLED luminous efficiency attenuation. The method is used for solving the technical problem of complexity in achieving an existing OLED luminous attenuation compensation method. The technical scheme is that luminous efficiency attenuation curves of red, green and blue three-primary-color organic light-emitting materials are respectively subject to fitting and mathematical modeling, and an external system mainframe writes recorded OLED panel working time parameters in a register of an OLED driving chip according to determined time intervals. The OLED driving chip performs sampling and quantization on the luminous efficiency attenuation curves of the red, green and blue three-primary-color organic light-emitting materials at specific time points, and finally independent compensation is performed on digital gamma-curves of the red, green and blue three-primary-color organic light-emitting materials. Compared with the prior art, according to the method, no modification needs to be performed on an OLED panel, work can be performed by utilizing a timer of the external system mainframe, and the method is simple to achieve.
Description
Technical field
The present invention relates to a kind of compensating circuit of OLED decay of luminescence, particularly a kind of OLED luminescence efficiency is through the digital compensation correcting circuit of time decay.Also relate to the digital compensation bearing calibration through the digital compensation correcting circuit of time decay based on above-mentioned OLED luminescence efficiency.
Background technology
OLED(Organ Light Emitting Diode, Organic Light Emitting Diode) be called as the third generation display technique after CRT, liquid crystal.With liquid crystal phase ratio, OLED has all solid state (without fluent meterial), active illuminating, high-contrast, ultra-thin, low-power consumption, wide without angle limitations, fast response time, operating temperature range, be easy to realize flexible demonstration and the plurality of advantages such as 3D shows, cost is low, manufacturing process is simple, be known as in the world the optimal selection of flat panel display of future generation after liquid crystal.
In the independent luminous OLED display panel of red, green, blue three primary colours luminous organic material, each pixel by three of red, green, blues independently sub-pixel form, they consist of red, green, blue three primary colours luminous organic material respectively, under the effect of drive current, send respectively red, green, blue three primary colours light, its luminosity is directly proportional to drive current size.According to display pixel data, independently control the drive current size (controlling their luminosity) of three sub-pixels of red, green, blue, can realize various colored demonstrations.But, present stage is owing to being subject to the restriction of luminous organic material characteristic, the photoelectric characteristic (luminescence efficiency) of red, green, blue three primary colours luminous organic material decays in time, and their attenuation degree differences in time (blue light material decay is at present the fastest, half life period only has an appointment 7000 hours), along with the increase of service time, oled panel produces serious colour cast and cross-color phenomenon, cause showing image quality decay, have a strong impact on the serviceable life of OLED product.
Document " Kuei-Yu Lee, Yen-Ping Hsu, A New Compensation Method for Emission Degradation in an AMOLED Display via an External Algorithm, New Pixel Circuit, and Models of Prior Measurements, Journal of Display Technology, 2013 " a kind of compensation method that shows decay of luminescence for OLED is disclosed, but the method need to be revised the image element circuit (increasing additional detections device) of oled panel, therefore the method can only be for specific oled panel, versatility is poor, and implementation method complexity, cost is high.
Summary of the invention
In order to overcome the compensation method of existing OLED decay of luminescence, realize complicated deficiency, the invention provides digital compensation correcting circuit and the method for a kind of OLED luminescence efficiency through time decay.The method by the light efficiency of red, green, blue three primary colours luminous organic material through time die-away curve carry out respectively matching and mathematical modeling, and the light efficiency attenuation characteristic parameter of the red, green, blue three primary colours luminous organic material that mathematical modeling is obtained is pre-stored in the register of OLED driving chip, external system main frame writes the oled panel working time parameter of record in the register of OLED driving chip according to definite time interval simultaneously.OLED drives the light efficiency die-away curve of chip red, green, blue three primary colours luminous organic material to particular point in time according to above-mentioned mathematical model sample and quantize, finally according to the damping capacity of calculating, the digital gamma-curve of red, green, blue three primary colours luminous organic material is carried out to independent compensation, OLED drives chip to produce driving voltage or the current-driven pixel unit after compensation, to eliminate due to different colour cast and the cross-color phenomenons that cause of red, green, blue three primary colours luminous organic material light efficiency attenuation characteristic.Compared with prior art, the present invention does not need oled panel to make any modification, only need drive chip internal to increase compensation correction circuit and correlation parameter register, utilize the timer of external system main frame just can work, method realizes simply, cost is low, compensating parameter changes flexibly, oled panel highly versatile.
The technical solution adopted for the present invention to solve the technical problems: a kind of OLED luminescence efficiency is through the digital compensation correcting circuit of time decay, be characterized in comprising graphic memory 201, column drive circuit 202, row drive control 203, digital interface and sequential control circuit 204, time parameter register 205, attenuation characteristic parameter register 206, digital compensation correcting circuit 207, red gamma-curvature correction circuit 208, green γ-curvature correction circuit 209 and blue γ-curvature correction circuit 210.Described digital interface and sequential control circuit 204 are for receiving steering order and the display image data of external system main frame, external system main frame is by digital interface and sequential control circuit 204, adopt the mode of register addressing to come access time parameter register 205 and attenuation characteristic parameter register 206, to change attenuation characteristic parameter and the time used of oled panel.Digital compensation correcting circuit 207 goes out required compensation rate according to the attenuation characteristic parameter of oled panel and time used calculation of parameter, and compensation rate is sent to respectively to red gamma-curvature correction circuit 208, green γ-curvature correction circuit 209 and blue γ-curvature correction circuit 210, driving voltage or electric current after column drive circuit 202 produces compensation, be loaded into the pixel cell of oled panel.
A digital compensation bearing calibration based on above-mentioned OLED luminescence efficiency through the digital compensation correcting circuit of time decay, is characterized in comprising the following steps:
S101, in the Design and manufacture stage of oled panel, by the method for accelerated deterioration, the light efficiency die-away curve in time of oled panel red, green, blue three primary colours luminous organic material is obtained in actual measurement.
S102, adopts the light efficiency attenuation characteristic of the red, green, blue three primary colours luminous organic material of cubic polynomial function to actual measurement to carry out curve fitting and mathematical modeling, asks for respectively their attenuation characteristic parameter.
S103, while driving chip power work, is driven the light efficiency attenuation characteristic parameter one-time write OLED of red, green, blue three primary colours material in the attenuation characteristic parameter register of chip by driver by external system main frame.
S104, system host is used inner timing circuit, records the running time of OLED screen, and is kept in nonvolatile memory recording result.
S105, system, when start or in operational process, writes the recorded OLED screen work time in the time parameter register of OLED driving chip according to the specific time interval.
S106, the attenuation characteristic parameter and the time parameter that drive the digital compensation correcting circuit foundation in chip to obtain, according to the calculated with mathematical model obtaining in S102, go out compensation rate, and red, green, blue digital gamma-curve is carried out respectively to independent compensation, finally by driving chip to produce driving voltage or the drive current after compensation.
S107, the driving voltage after compensation or drive current are loaded into the pixel cell of oled panel.
The invention has the beneficial effects as follows: the method by the light efficiency of red, green, blue three primary colours luminous organic material through time die-away curve carry out respectively matching and mathematical modeling, and the light efficiency attenuation characteristic parameter of the red, green, blue three primary colours luminous organic material that mathematical modeling is obtained is pre-stored in the register of OLED driving chip, external system main frame writes the oled panel working time parameter of record in the register of OLED driving chip according to definite time interval simultaneously.OLED drives the light efficiency die-away curve of chip red, green, blue three primary colours luminous organic material to particular point in time according to above-mentioned mathematical model sample and quantize, finally according to the damping capacity of calculating, the digital gamma-curve of red, green, blue three primary colours luminous organic material is carried out to independent compensation, OLED drives chip to produce driving voltage or the current-driven pixel unit after compensation, to eliminate due to different colour cast and the cross-color phenomenons that cause of red, green, blue three primary colours luminous organic material light efficiency attenuation characteristic.Compared with prior art, the present invention does not need oled panel to make any modification, only need drive chip internal to increase compensation correction circuit and correlation parameter register, utilize the timer of external system main frame just can work, method realizes simply, cost is low, compensating parameter changes flexibly, oled panel highly versatile.
Below in conjunction with the drawings and specific embodiments, the present invention is elaborated.
Accompanying drawing explanation
Fig. 1 be OLED luminescence efficiency of the present invention through time decay the process flow diagram of digital compensation bearing calibration.
Fig. 2 be the inventive method with OLED luminescence efficiency through time decay digital compensation correcting circuit.
Embodiment
With reference to Fig. 1-2, describe the present invention in detail.
In the Design and manufacture stage of oled panel, by the method for accelerated deterioration, actual measurement is obtained red, green, the light efficiency of blue three primary colours luminous organic material through time die-away curve, then by red, green, the light efficiency of blue three primary colours luminous organic material through time die-away curve carry out curve fitting respectively and mathematical modeling, and mathematical modeling is obtained red, green, the light efficiency attenuation characteristic parameter of blue three primary colours luminous organic material is pre-stored in the register of OLED driving chip, external system main frame writes the oled panel working time parameter of record in the register of OLED driving chip according to definite time interval timing simultaneously.OLED drives chip according to above-mentioned mathematical model, the light efficiency die-away curve of the red, green, blue three primary colours luminous organic material to particular point in time samples and quantizes, finally according to the damping capacity of calculating, the digital gamma-curve of red, green, blue three primary colours luminous organic material is carried out to independent compensation, and by driving chip to produce driving voltage and the current-driven pixel unit after compensation, to eliminate due to the inconsistent colour cast causing of red, green, blue three primary colours luminous organic material light efficiency attenuation characteristic and cross-color phenomenon.
The light efficiency attenuation characteristic of red, green, blue three primary colours luminous organic material respectively available following mathematical model is approximate: red light efficiency damping capacity Δ L
r=k
1Rt+k
2Rt
2+ k
3Rt
3, green light efficiency damping capacity Δ L
g=k
1Gt+k
2Gt
2+ k
3Gt
3, blue light efficiency damping capacity Δ L
b=k
1Bt+k
2Bt
2+ k
3Bt
3, wherein k
1R, k
2Rand k
3Rfor red light efficiency attenuation characteristic parameter, k
1G, k
2Gand k
3Gfor green light efficiency attenuation characteristic parameter, k
1B, k
2Band k
3Bfor blue light efficiency attenuation characteristic parameter, t is the OLED working time.Light efficiency attenuation characteristic parameter is directly related with the performance of oled panel luminous organic material used, the size of its parameter value needs to determine according to the concrete oled panel using, when driving chip power work, by external host, by driver, these light efficiency attenuation characteristic parameter one-time writes OLED is driven in the register of chip.By the oled panel working time parametric t of external system host record, also can regularly be write in the register that drives chip simultaneously, drive chip according to panel working time t and light efficiency attenuation characteristic parameter k
1, k
2and k
3can calculate respectively the light efficiency damping capacity of red, green, blue three primary colours luminous organic material.Then drive chip, according to the light efficiency damping capacity of calculating, the digital gamma-curve of red, green, blue three primary colours is carried out to independent compensation, driving voltage after being finally compensated or electric current, be loaded into pixel unit circuit and can be produced the drive current after compensation, thereby compensation pixel luminosity, reaches the object of eliminating colour cast and cross-color.
OLED luminescence efficiency is as follows through the digital compensation bearing calibration concrete steps of time decay:
S101, in the Design and manufacture stage of oled panel, by the method for accelerated deterioration, the light efficiency die-away curve in time of oled panel red, green, blue three primary colours luminous organic material is obtained in actual measurement.
S102, adopts the light efficiency attenuation characteristic of the red, green, blue three primary colours luminous organic material of cubic polynomial function to actual measurement to carry out curve fitting and mathematical modeling, asks for respectively their attenuation characteristic parameter.
S103, while driving chip power work, is driven the light efficiency attenuation characteristic parameter one-time write OLED of red, green, blue three primary colours material in the attenuation characteristic parameter register of chip by driver by external system main frame.
S104, system host is used inner timing circuit, records the running time of OLED screen, and is kept in nonvolatile memory recording result.
S105, system, when start or in operational process, writes the recorded OLED screen work time in the time parameter register of OLED driving chip according to the specific time interval.
S106, the attenuation characteristic parameter and the time parameter that drive the digital compensation correcting circuit foundation in chip to obtain, according to the calculated with mathematical model obtaining in S102, go out compensation rate, and red, green, blue digital gamma-curve is carried out respectively to independent compensation, finally by driving chip to produce driving voltage or the drive current after compensation.
S107, the driving voltage after compensation or drive current are loaded into the pixel cell of oled panel.
In the present invention, OLED luminescence efficiency is built in OLED through the digital compensation correcting circuit of time decay and drives in chip, and its physical circuit comprises: graphic memory 201, column drive circuit 202, row drives controls 203, digital interface and sequential control circuit 204, time parameter register 205, attenuation characteristic parameter register 206, digital compensation correcting circuit 207, red gamma-curvature correction circuit 208, green γ-curvature correction circuit 209, blue γ-curvature correction circuit 210.Wherein, digital interface and sequential control circuit 204 are for receiving steering order and the display image data of external system main frame, external system main frame is by this interface circuit, adopt the mode of register addressing to come access time parameter register 205 and attenuation characteristic parameter register 206, to change attenuation characteristic parameter and the time used of oled panel.Digital compensation correcting circuit 207 goes out required compensation rate according to the attenuation characteristic parameter of oled panel and time used calculation of parameter, and compensation rate is sent to respectively to red, green, blue digital gamma-curvature correction circuit, finally by column drive circuit, produce driving voltage or the electric current after compensation, be loaded into the pixel cell of oled panel.
Claims (2)
1. OLED luminescence efficiency, through a digital compensation correcting circuit for time decay, is characterized in that: comprising that graphic memory (201), column drive circuit (202), row drive controls (203), digital interface and sequential control circuit (204), time parameter register (205), attenuation characteristic parameter register (206), digital compensation correcting circuit (207), red gamma-curvature correction circuit (208), green γ-curvature correction circuit (209) and blue γ-curvature correction circuit (210); Described digital interface and sequential control circuit (204) are for receiving steering order and the display image data of external system main frame, external system main frame is by digital interface and sequential control circuit (204), adopt the mode of register addressing to come access time parameter register (205) and attenuation characteristic parameter register (206), to change attenuation characteristic parameter and the time used of oled panel; Digital compensation correcting circuit (207) goes out required compensation rate according to the attenuation characteristic parameter of oled panel and time used calculation of parameter, and compensation rate is sent to respectively to red gamma-curvature correction circuit (208), green γ-curvature correction circuit (209) and blue γ-curvature correction circuit (210), through column drive circuit (202), produce driving voltage or the electric current after compensating, be loaded into the pixel cell of oled panel.
2. the digital compensation bearing calibration through the digital compensation correcting circuit of time decay based on OLED luminescence efficiency described in claim 1, is characterized in that comprising the following steps:
S101, in the Design and manufacture stage of oled panel, by the method for accelerated deterioration, the light efficiency die-away curve in time of oled panel red, green, blue three primary colours luminous organic material is obtained in actual measurement;
S102, adopts the light efficiency attenuation characteristic of the red, green, blue three primary colours luminous organic material of cubic polynomial function to actual measurement to carry out curve fitting and mathematical modeling, asks for respectively their attenuation characteristic parameter;
S103, while driving chip power work, is driven the light efficiency attenuation characteristic parameter one-time write OLED of red, green, blue three primary colours material in the attenuation characteristic parameter register of chip by driver by external system main frame;
S104, system host is used inner timing circuit, records the running time of OLED screen, and is kept in nonvolatile memory recording result;
S105, system, when start or in operational process, writes the recorded OLED screen work time in the time parameter register of OLED driving chip according to the specific time interval;
S106, the attenuation characteristic parameter and the time parameter that drive the digital compensation correcting circuit foundation in chip to obtain, according to the calculated with mathematical model obtaining in S102, go out compensation rate, and red, green, blue digital gamma-curve is carried out respectively to independent compensation, finally by driving chip to produce driving voltage or the drive current after compensation;
S107, the driving voltage after compensation or drive current are loaded into the pixel cell of oled panel.
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