CN110767178B - Voltage compensation method of organic light emitting diode - Google Patents
Voltage compensation method of organic light emitting diode Download PDFInfo
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- CN110767178B CN110767178B CN201911086997.6A CN201911086997A CN110767178B CN 110767178 B CN110767178 B CN 110767178B CN 201911086997 A CN201911086997 A CN 201911086997A CN 110767178 B CN110767178 B CN 110767178B
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- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3275—Details of drivers for data electrodes
- G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
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Abstract
The invention provides a voltage compensation method of an organic light emitting diode, which improves the display uniformity and the picture quality of a display. Calculating a voltage drop from a power voltage of a pixel farthest from a power input to a power voltage of a power input start terminal; sequentially calculating the voltage drop from the power supply voltage of each pixel to the power supply voltage of the power supply input starting end according to the voltage drop from the power supply voltage of the pixel farthest from the power supply input to the power supply voltage of the power supply input starting end; and acquiring a corresponding compensation value from voltage compensation data bound with the voltage drop according to the voltage drop from the power supply voltage of each pixel to the power supply voltage of the power supply input starting end.
Description
Technical Field
The invention relates to the technical field of pixel driving circuits of displays, in particular to a voltage compensation method of an organic light emitting diode.
Background
Organic Light-Emitting displays (abbreviated as OLEDs), which are one of the hotspots in the field of flat panel Display research, have advantages of low energy consumption, low production cost, self-luminescence, wide viewing angle, and fast response speed, compared with conventional Liquid Crystal displays (abbreviated as LCDs). At present, the OLED has gradually replaced the conventional lcd screen in the display fields of mobile phones, handheld computers (PAD), Digital cameras, etc.
As shown in fig. 1, a conventional sub-pixel driving circuit of the bit OLED of fig. 1 is composed of a driving transistor T1, a switching TFT T2, a capacitor C1, a data line data, a scan line G1, an anode power supply VDD, a cathode power supply VSS, and an OLED device. The current flowing through the driving transistor T1 can be represented by the following formula:
ids is N W/L (Vgs-Vth)2(1+ λ Vds), where N is the mobility and gate-oxide capacitance related coefficient of the driving transistor T1, and W/L is the width-to-length ratio of the driving transistor T1. Vgs is the voltage difference between the gate and the source of the driving transistor T1, Vth is the threshold voltage of the driving transistor T1, Vds is the voltage difference between the drain and the source of the driving transistor T1, and λ is a constant. From the above equation, as Vgs and Vds increase, the Ids current also increases; similarly, as Vgs and Vds decrease, the Ids current also decreases.
Assuming that Voled is a voltage difference between two ends of the OLED device, Vgs ═ Vdata- (VSS + Voled), and Vds ═ VDD-VSS-Voled, where Vdata is a voltage of a data line signal source, since VDD and VSS are both connected by metal lines in the OLED display panel and power is supplied from the outside of the display panel, VDD and VSS are metal lines, and thus when a current of each pixel flows through VDD and VSS, VDD and VSS consume a part of the voltage, a voltage at the end of VDD near the driving transistor T1 is reduced, and a voltage at the end of VSS far from the OLED is raised, which is called a voltage Drop (IR Drop), i.e., a voltage actually applied to the end of each pixel VDD near the driving transistor T1 is lower than an ideal voltage, and a voltage actually applied to the end of VSS far from the OLED is higher than an ideal voltage, according to the formula: vgs ═ Vdata- (VSS + Voled), Vds ═ VDD-VSS-Voled, so that Vgs and Vds of the driving transistor T1 decrease, decreasing the Ids current of the driving transistor T1. And the farther the pixel is from the voltage input, the higher the current reduction because the electrode resistance is larger and the voltage drop is larger.
As shown in fig. 2, when one OLED display panel VDD and VSS is supplied from a lower portion, and the resistance between each row of pixels of the metal electrodes connected to the inside of the panel is R, VDD and VSS of the pixel closest to the power input end at the bottom end of the panel are closest to the ideal voltage, and VDD and VSS of the pixel farthest from the power input end at the top end of the panel are the most different from the ideal voltage due to IR Drop, so that the luminance at the upper portion of the panel is low, the luminance at the lower portion is dark, the display uniformity is affected, and the image quality is reduced.
Disclosure of Invention
The embodiment of the invention provides a voltage compensation method of an organic light emitting diode, which improves the display uniformity and the picture quality of a display after compensating the voltage of a pixel.
In a first aspect, the present invention provides a voltage compensation method for an organic light emitting diode, the method comprising:
calculating the voltage drop from the power voltage of the pixel farthest from the power input to the power voltage of the power input starting end;
according to the voltage drop from the power voltage of the pixel farthest from the power input to the power voltage of the power input starting end, sequentially reducing the voltage drop from the power voltage of each pixel to the power voltage of the power input starting end;
acquiring a corresponding compensation value from voltage compensation data bound with the voltage drop according to the voltage drop from the power supply voltage of each pixel to the power supply voltage of the power supply input starting end;
and adjusting the voltage of the data signal input to each pixel according to the acquired compensation value.
By the method, the voltage drop from the power supply voltage of each pixel to the power supply voltage of the power supply input starting end is calculated in sequence, then each voltage drop is obtained according to the calculation, the corresponding compensation value is obtained from the voltage compensation data bound by the voltage drop, and the voltage of the data signal input to each pixel is adjusted according to the compensation value, so that the voltage for driving each pixel reaches the ideal voltage. For example, the voltage drop from the 5 th pixel of the power voltage at the power input start end to the power voltage at the power input start end is calculated to be 0.5V, and a corresponding compensation value is obtained from the voltage compensation data bound by the voltage drop according to the voltage drop of 0.5V, wherein the compensation value may be 0.3V, or may be a coefficient of 1.2, or may be 0.3V and a coefficient of 1.2. If the obtained compensation value is 0.3V, the voltage of the data signal input to the pixel is increased by 0.3V, whereas if the obtained compensation value is a coefficient 1.2, the voltage of the data signal input to the pixel is 0.5V × 1.2 to 0.6V, and if the obtained compensation value is 0.3V and a coefficient 1.2, the voltage of the data signal input to the pixel is 0.5V × 1.2+0.3V to 0.9V. Therefore, the voltage for driving the pixels reaches the ideal voltage, and the partial bright area and the partial dark area of the display are avoided when the voltages of the pixels at different positions are inconsistent.
In an alternative implementation, calculating a voltage drop from a power supply voltage of a pixel farthest from a power supply input to a power supply voltage of a start terminal of the power supply input includes:
continuously scanning two frames, and respectively calculating the voltage drop from the power voltage of the pixel farthest from the power input to the power voltage of the power input starting end;
if Δ Vi-1-ΔVi-2|<At a preset value, will Δ Vi-1As a voltage drop from the power supply voltage of the pixel farthest from the power supply input in the next frame to the power supply voltage of the power supply input start terminal;
if Δ Vi-1-ΔVi-2When | is larger than the preset value, continuously scanning two frames again until | delta Vi-1-ΔVi-2|<Presetting a value;
wherein, is Δ Vi-1Represents a voltage drop, Δ V, from a power supply voltage of a pixel farthest from a power supply input to a power supply voltage of a power supply input start terminal in a second frame of two framesi-2Which represents a voltage drop from a power supply voltage of a pixel farthest from a power supply input to a power supply voltage of a power supply input start terminal in a first frame of two frames continuously scanned.
In an alternative implementation, sequentially calculating a voltage drop of the power supply voltage of each pixel to the power supply voltage of the power supply input starting end according to a voltage drop of the power supply voltage of the pixel farthest from the power supply input to the power supply voltage of the power supply input starting end includes:
calculating a voltage drop of a power supply voltage between adjacent pixels;
and sequentially calculating the voltage drop from the power supply voltage of each pixel to the power supply voltage of the power supply input starting end according to the voltage drop of the power supply voltage between the adjacent pixels and the voltage drop from the power supply voltage of the pixel farthest from the power supply input to the power supply voltage of the power supply input starting end.
In an alternative implementation, calculating a voltage drop of a power supply voltage between adjacent pixels includes:
according to the formula:
wherein，dVjIndicating a voltage drop from a power supply voltage of a pixel j at a power supply voltage position near a power supply input start terminal to a power supply voltage of a pixel j +1 at a power supply voltage position near the power supply input start terminal, InRepresenting the current flowing into the nth pixel at the position farthest from the power supply input, Rj+1Represents a resistance encountered in a pixel at the j +1 th pixel from the power supply voltage position at which a current flows from the j-1 th pixel near the power supply input start terminal to the power supply voltage position at which the power supply input start terminal, and n represents a total of a plurality of pixels.
In an alternative implementation, sequentially calculating a voltage drop of the power supply voltage of each pixel to the power supply voltage of the power supply input starting end according to a voltage drop of the power supply voltage between the adjacent pixels and a voltage drop of the power supply voltage of the pixel farthest from the power supply input to the power supply voltage of the power supply input starting end includes:
according to the formula: Δ Vj＝ΔVj+1-dVj
Wherein, is Δ VjDenotes a voltage drop, Δ V, from the power supply voltage of the jth pixel at a power supply voltage position near the power supply input start terminal to the power supply voltage at the power supply input start terminalj+1Indicating a voltage drop from the power supply voltage of the (j + 1) th pixel at the power supply voltage position near the power supply input start terminal to the power supply voltage at the power supply input start terminal.
In an alternative implementation, scanning two frames consecutively and calculating voltage drops of power supply voltages from pixels farthest from a power supply input to a start terminal of the power supply input, respectively, includes:
according to the formula: v total _ i-2 ═ n × L i-2+ (n-1) × L2 i-2+ … + Ln i-2;
V total_i-1＝n*L1 i-1+1+(n-1)*L2 i-1+1+…+Ln_i-1；
Ln＝In×Rn；
wherein V total _ i-2 and V total _ i-1 represent voltage drops of a power supply voltage of a pixel farthest from a power supply input to a power supply voltage of a power supply input start terminal In a first frame and a second frame of two consecutive scans, respectively, n represents an nth pixel of the power supply voltage of the power supply input start terminal, Ln represents a voltage drop between the nth pixel of the power supply voltage of the power supply input start terminal and an nth-1 pixel of the power supply voltage of the power supply input start terminal, i-2 represents the first frame of the two consecutive scans, i-1 represents the second frame of the two consecutive scans, In represents a current flowing to the nth pixel of the power supply voltage of the power supply input start terminal, and Rn represents a resistance encountered by a current flowing from the nth-1 pixel of the power supply voltage of the power supply input start terminal to the nth pixel of the power supply voltage of the power supply input start terminal.
In an alternative implementation, the voltage drop from the power supply voltage of each pixel to the power supply voltage of the power supply input starting end is calculated in turn, and then the method further comprises:
calculating the voltage drop from the power voltage of the pixel farthest from the power input to the power voltage of the power input starting end;
judging the relation between the voltage drop from the power voltage of the pixel farthest from the power input to the power voltage of the power input starting end and the voltage drop from the pixel farthest from the power input to the power voltage of the power input starting end in the previous frame;
if the | Vtotal _ i-Vtotal _ i-1| < a preset value, taking the Δ Vtotal _ i as the voltage drop from the power voltage of the pixel farthest from the power input to the power voltage of the power input starting end in the next frame;
if the | Vtotal _ i-Vtotal _ i-1| is larger than the preset value, two frames are continuously scanned again, and the voltage drop from the power voltage of the pixel farthest from the power input to the power voltage of the power input starting end in each frame of the two frames is calculated respectively until the | delta Vi-1-ΔVi-2|<Presetting a value;
wherein Vtotal _ i-1 represents a voltage drop from the power supply voltage of the pixel farthest from the power supply input to the power supply voltage of the power supply input start terminal in the previous frame, and Vtotal _ i represents a voltage drop from the power supply voltage of the pixel farthest from the power supply input to the power supply voltage of the power supply input start terminal in the current frame.
In an alternative implementation, calculating a voltage drop from a power supply voltage of a pixel farthest from a power supply input to a power supply voltage of a start terminal of the power supply input includes:
according to the formula:
where Vtotal _ i represents the voltage drop from the power supply voltage of the pixel farthest from the power supply input to the power supply voltage of the power supply input start terminal in the current frame, n represents how many pixels in total, and dVjIndicating a voltage drop from the power voltage of the jth pixel at the power voltage position near the power input start terminal to the power voltage of the j +1 th pixel at the power voltage position at the power input start terminal.
In an alternative implementation, calculating a voltage drop from a power supply voltage of a pixel farthest from a power supply input to a power supply voltage of a start terminal of the power supply input further includes:
a voltage compensation data table is created that binds to the voltage drop.
In an alternative implementation, adjusting a voltage of a data signal input to each pixel according to the obtained compensation value includes:
if the obtained compensation value is a voltage value, adjusting the voltage of the data signal input to each pixel according to the obtained voltage value;
and if the obtained compensation value is a coefficient corresponding to the voltage drop, adjusting the voltage of the data signal input to each pixel according to the obtained coefficient.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a schematic diagram of a pixel circuit of an OLED display panel in the prior art;
FIG. 2 is a schematic structural diagram of an OLED display device in the prior art;
FIG. 3 is a flowchart illustrating a voltage compensation method for an OLED according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart illustrating a voltage compensation method for an OLED according to an embodiment of the present invention;
FIG. 5 is a schematic flow chart illustrating a voltage compensation method for an OLED according to an embodiment of the present invention;
fig. 6 is a schematic flow chart illustrating a voltage compensation method for an organic light emitting diode according to another embodiment of the present invention.
Detailed Description
The technical solutions of the embodiments of the present invention are described in detail with reference to the drawings and the specific embodiments, and it should be understood that the specific features of the embodiments and the embodiments of the present invention are detailed descriptions of the technical solutions of the embodiments of the present invention, and are not limited to the technical solutions of the embodiments of the present invention, and the technical features of the embodiments and the embodiments of the present invention may be combined with each other without conflict.
In a first aspect, in order to improve the display uniformity and the image quality of the display panel, the present invention includes a voltage compensation method for an organic light emitting diode, as shown in fig. 3, the method comprising:
103, acquiring a corresponding compensation value from voltage compensation data bound with the voltage drop according to the voltage drop from the power voltage of each pixel to the power voltage of the power input starting end;
and 104, adjusting the voltage of the data signal input to each pixel according to the acquired compensation value.
Specifically, the power supply supplies a voltage to the organic light emitting diode through a Printed Circuit Board (PCB) in the display device, wherein the power supply voltage of the power input start terminal refers to a terminal closest to the organic light emitting diode.
More specifically, the OLED display panel includes a plurality of columns and a plurality of rows of organic light emitting diodes, and anode power sources driving each column of the organic light emitting diodes are independent from each other, and each of the organic light emitting diodes driven by the anode power sources is located in a different row. It is to be added that, for driving the light-emitting diodes, the light-emitting diodes are also connected at least to a data signal terminal, wherein the data signal terminal is used for inputting a data signal voltage to the light-emitting diodes.
By the method, the voltage drop from the power supply voltage of each pixel to the power supply voltage of the power supply input starting end is calculated in sequence, then each voltage drop is obtained according to the calculation, the corresponding compensation value is obtained from the voltage compensation data bound by the voltage drop, and the voltage of the data signal input to each pixel is adjusted according to the compensation value, so that the voltage for driving each pixel reaches the ideal voltage. It should be added that once the voltage drop from the power voltage of the pixel at a certain position to the power voltage of the power input starting end is calculated, the corresponding compensation value can be obtained according to the voltage drop, so as to adjust the voltage of the data signal input to the pixel according to the obtained compensation value, and the voltage of the data signal of each pixel does not need to be adjusted after the voltage drop from the power voltage of each pixel to the power voltage of the power input starting end is calculated.
For example, the voltage drop from the 5 th pixel of the power voltage at the power input start end to the power voltage at the power input start end is calculated to be 0.5V, and according to the voltage drop of 0.5V, a corresponding compensation value is obtained from the voltage compensation data bound by the voltage drop, and the compensation value may be 0.3V or a coefficient of 1.2, or may be 0.3V and a coefficient of 1.2. If the obtained compensation value is 0.3V, the voltage of the data signal input to the pixel is increased by 0.3V, and if the obtained compensation value is a coefficient of 1.2, the voltage of the data signal input to the pixel is set to 0.5V × 1.2 to 0.6V, and if the obtained compensation value is 0.3V and a coefficient of 1.2, the voltage of the data signal input to the pixel is set to 0.5V × 1.2+0.3V × 0.9V, so that the voltage for driving the pixel reaches an ideal voltage, and thus, when the voltage for driving the pixel is insufficient, the display luminance is not sufficient, and the display uniformity and the picture quality are improved.
In an alternative implementation, the step 101 can be implemented by two possible implementations, where in a first possible implementation, the step 101 of calculating a voltage drop from a power supply voltage of a pixel farthest from a power supply input to a power supply voltage of a power supply input starting end includes:
wherein, is Δ Vi-1Represents a voltage drop, Δ V, from a power supply voltage of a pixel farthest from a power supply input to a power supply voltage of a power supply input start terminal in a second frame of two framesi-2Which represents a voltage drop from a power supply voltage of a pixel farthest from a power supply input to a power supply voltage of a power supply input start terminal in a first frame of two frames continuously scanned.
Specifically, the preset value may be a setting that the user considers to be when | Δ Vi-1-ΔVi-2|<When the value is preset, the picture load change is small and the picture quality is stable when two frames are continuously scanned.
By the method, the voltage drop from the power voltage of the pixel farthest from the power input to the power voltage of the power input starting end in the previous two continuous frames is calculated, and then whether the absolute value of the voltage drop difference from the power voltage of the pixel farthest from the power input to the power voltage of the power input starting end in the two continuous frames is smaller than a preset value or not is judged, so that the picture load change is obtained, if the picture load change is smaller, the picture quality is stable, and the voltage drop from the power voltage of the pixel farthest from the power input to the power voltage of the power input starting end in the last frame in the two continuous scanning frames can be used as the voltage drop from the power voltage of the pixel farthest from the power input to the power voltage of the power input starting end in the next frame.
Or by the method, if the absolute value of the voltage drop difference between the power voltage of the pixel farthest from the power input and the power voltage of the power input starting end in two continuous frames is larger than the preset value, the picture load change is larger, and the picture quality is poorer.
Specifically, in an alternative implementation, the step 201 of scanning two frames consecutively and calculating voltage drops of the power supply voltages from the pixels farthest from the power supply input to the start terminal of the power supply input respectively includes:
according to the formula: v total _ i-2 ═ n L1 i-2+ (n-1) × L2 i-2+ … + Ln i-2;
V total_i-1＝n*L1 i-1+1+(n-1)*L2 i-1+1+…+Ln_i-1；
Ln＝In×Rn；
wherein V total _ i-2 and V total _ i-1 represent voltage drops of a power supply voltage of a pixel farthest from a power supply input to a power supply voltage of a power supply input start terminal In a first frame and a second frame of two consecutive scans, respectively, n represents an nth pixel of the power supply voltage of the power supply input start terminal, Ln represents a voltage drop between the nth pixel of the power supply voltage of the power supply input start terminal and an nth-1 pixel of the power supply voltage of the power supply input start terminal, i-2 represents the first frame of the two consecutive scans, i-1 represents the second frame of the two consecutive scans, In represents a current flowing to the nth pixel of the power supply voltage of the power supply input start terminal, and Rn represents a resistance encountered by a current flowing from the nth-1 pixel of the power supply voltage of the power supply input start terminal to the nth pixel of the power supply voltage of the power supply input start terminal.
In a second possible implementation manner, the step 101 of calculating a voltage drop from a power supply voltage of a pixel farthest from a power supply input to a power supply voltage of a power supply input starting end includes:
according to the formula:
ΔV＝I1×R1+(I1+I2)×R2+(I1+I2+I3)×R3+…+(I1+I2+…In)×Rn
where Δ V denotes a voltage drop from a power supply voltage of a pixel farthest from a power supply input to a power supply voltage of a power supply input start terminal In a current frame, In denotes a current flowing to an nth pixel of the power supply voltage of the power supply input start terminal, I1 denotes a current of the nth pixel of the power supply voltage of the power supply input start terminal, and Rn denotes a resistance encountered when a current flows from an n-1 th pixel of the power supply voltage of the power supply input start terminal to the nth pixel of the power supply voltage of the power supply input start terminal.
By the above method, the voltage drop from the power supply voltage of the pixel farthest from the power supply input to the power supply voltage of the power supply input start terminal is calculated.
In an alternative implementation, step 102, calculating the voltage drop of the power voltage of each pixel to the power voltage of the power input starting end in turn according to the voltage drop of the power voltage of the pixel farthest from the power input to the power voltage of the power input starting end, as shown in fig. 5, includes:
Note that the pixel farthest from the power input is the nth pixel of the power supply voltage at the start of the power input. Then, by the above method, a voltage drop of the power voltage of the n-1 th pixel of the power voltage of the power input start terminal to the power voltage of the n-th pixel of the power voltage of the power input start terminal is calculated, and a voltage drop of the power voltage of the n-1 th pixel of the power voltage of the power input start terminal to the power voltage of the power input start terminal is calculated based on the result of the calculation and the voltage drop of the power voltage of the n-th pixel of the power voltage from the power input start terminal to the power voltage of the power input start terminal.
And repeating the steps, calculating the voltage drop from the power voltage of the (n-2) th pixel of the power voltage of the power input starting end to the power voltage of the (n-1) th pixel of the power voltage of the power input starting end, calculating the voltage drop from the power voltage of the (n-1) th pixel of the power voltage of the power input starting end to the power voltage of the power input starting end according to the calculation result and the voltage drop from the power voltage of the (n-1) th pixel of the power voltage of the power input starting end to the power voltage of the power input starting end, and calculating the voltage drop from the power voltage of the (n-2) th pixel of the power voltage of the power input starting end until the voltage drop from the power voltage of each pixel to the power voltage of.
In an alternative implementation, step 301 of calculating a voltage drop of a power supply voltage between adjacent pixels includes:
according to the formula:
wherein, dVjIndicating a voltage drop from a power supply voltage of a pixel j at a power supply voltage position near a power supply input start terminal to a power supply voltage of a pixel j +1 at a power supply voltage position near the power supply input start terminal, InRepresenting the current flowing into the nth pixel at the position farthest from the power supply input, Rj+1Represents a resistance encountered in a pixel at the j +1 th pixel from the power supply voltage position at which a current flows from the j-1 th pixel near the power supply input start terminal to the power supply voltage position at which the power supply input start terminal, and n represents a total of a plurality of pixels.
By the above method, the voltage drop from the power supply voltage of the (n-1) th pixel at the position next to the pixel farthest from the power supply input to the power supply voltage of the (n) th pixel at the position farthest from the power supply input is calculated
Then dVn-1＝RnInIt is actually calculated to be the farthest from the power inputThe difference between the power supply voltage of the (n-1) th pixel at the next position of the end pixel and the power supply voltage of the (n) th pixel at the position farthest from the power supply input is calculated, that is, the voltage consumed in flowing from the (n-1) th pixel at the next position close to the pixel at the farthest position from the power supply input to the (n) th pixel at the position farthest from the power supply input is calculated.
Calculating a voltage drop from a power voltage of a pixel (n-2) th from a power voltage position of a power input start terminal to a power voltage of a pixel (n-1) th from the power voltage position of the power input start terminal
Then dVn-2＝Rn-1*(In+In-1)。
Thus, the voltage drop from the power supply voltage of the (n-1) th pixel at the next position close to the pixel farthest from the power supply input to the power supply voltage of the power supply input starting terminal can be obtained based on the voltage drop from the power supply voltage of the (n) th pixel at the position farthest from the power supply input to the power supply voltage of the power supply input starting terminal and the voltage consumed by flowing from the (n-1) th pixel at the next position close to the pixel farthest from the power supply input to the (n) th pixel at the position farthest from the power supply input.
In an alternative implementation, step 302, calculating the voltage drop of the power supply voltage of each pixel to the power supply voltage of the power supply input starting end in turn according to the voltage drop of the power supply voltage between adjacent pixels and the voltage drop of the power supply voltage of the pixel farthest from the power supply input to the power supply voltage of the power supply input starting end, includes:
according to the formula: Δ Vj＝ΔVj+1-dVj
Wherein, is Δ VjDenotes a voltage drop, Δ V, from the power supply voltage of the jth pixel at a power supply voltage position near the power supply input start terminal to the power supply voltage at the power supply input start terminalj+1Indicating the power supply voltage of the j +1 th pixel at the power supply voltage position near the start of the power supply inputVoltage drop of the power supply voltage to the start of the power supply input.
By the above method, the voltage drop from the power supply voltage of the pixel farthest from the power supply input to the power supply voltage of the power supply input start terminal is Δ Vi-1The voltage drop from the power supply voltage of the n-1 th pixel at the power supply voltage position of the power supply input starting end to the power supply voltage of the n-th pixel at the position farthest from the power supply input can be calculated.
Then, according to the voltage drop from the power voltage of the (n-1) th pixel at the power voltage position of the power input starting end to the power voltage of the power input starting end, the voltage drop from the power voltage of the (n-2) th pixel at the power voltage position of the power input starting end to the power voltage of the (n-1) th pixel at the power voltage position of the power input starting end, the voltage drop from the power voltage of the (n-2) th pixel at the power voltage position of the power input starting end to the power voltage of the power input starting end can be calculated, and the voltage drop from the power voltage of each pixel to the power voltage of the power input starting end is calculated in sequence.
In an alternative implementation, step 302, calculating the voltage drop of the power supply voltage of each pixel to the power supply voltage of the power supply input starting end in turn, as shown in fig. 6, and then further includes:
wherein Vtotal _ i-1 represents a voltage drop from the power supply voltage of the pixel farthest from the power supply input to the power supply voltage of the power supply input start terminal in the previous frame, and Vtotal _ i represents a voltage drop from the power supply voltage of the pixel farthest from the power supply input to the power supply voltage of the power supply input start terminal in the current frame.
Specifically, wherein | Vtotal _ i-Vtotal _ i-1<A preset value, where the preset value is associated with | Δ Vi-1-ΔVi-2|<The default values are the same value when | Vtotal _ i-Vtotal _ i-1|, the Y-axis is perpendicular to the Y-axis<When the value is a preset value, it shows that the picture quality is relatively stable, and Vtotal _ i is used as the voltage drop from the power voltage of the pixel farthest from the power input to the power voltage of the power input starting end in the next frame, so that the voltage drop from the power voltage of the pixel farthest from the power input to the power voltage of the power input starting end in the next frame does not need to be additionally calculated.
When the | Vtotal _ i-Vtotal _ i-1| is greater than the default value, it indicates that the picture quality is unstable, and two frames need to be scanned again and continuously until the | Δ Vi-1-ΔVi-2|<A preset value.
In an alternative implementation, step 401, calculating a voltage drop from a power supply voltage of a pixel farthest from a power supply input to a power supply voltage of a power supply input starting end includes:
according to the formula:
where Vtotal _ i represents the voltage drop from the power supply voltage of the pixel farthest from the power supply input to the power supply voltage of the power supply input start terminal in the current frame, n represents how many pixels in total, and dVjIndicating the jth power supply voltage position near the beginning of the power supply inputVoltage drop of power supply voltage of pixel to power supply voltage position j +1 th pixel of power supply input starting end.
By the method, when the voltage drop from the power voltage of the jth pixel of the power voltage of the power input starting end to the power voltage of the power input starting end is calculated each time, the voltage drop from the power voltage of the jth pixel of the power voltage of the power input starting end to the power voltage of the (j + 1) th pixel of the power voltage of the power input starting end needs to be calculated, so that the voltage drop from the power voltage of the pixel farthest from the power input to the power voltage of the power input starting end in the current frame can be calculated only by accumulating the voltage drops between every two adjacent pixels.
In an alternative implementation, the step 101 of calculating a voltage drop from a power supply voltage of a pixel farthest from a power supply input to a power supply voltage of a power supply input starting end further includes:
a voltage compensation data table is created that binds to the voltage drop.
Specifically, the voltage drop and the current of the pixel drop caused by the voltage drop can be found through multiple simulations or tests, so as to create a voltage compensation data table bound with the voltage drop, wherein the voltage compensation data table can be used for finding the voltage value of the desired compensation according to the voltage drop, and can also be used for finding the coefficient of the desired compensation according to the voltage drop.
In an alternative implementation, adjusting a voltage of a data signal input to each pixel according to the obtained compensation value includes:
if the obtained compensation value is a voltage value, adjusting the voltage of the data signal input to each pixel according to the obtained voltage value;
with the above method, if the acquired compensation value is a coefficient corresponding to the voltage drop, the voltage of the data signal input to each pixel is adjusted according to the acquired coefficient. For example, the voltage drop from the 5 th pixel of the power voltage at the power input start end to the power voltage at the power input start end is calculated to be 0.5V, and a corresponding compensation value is obtained from the voltage compensation data bound by the voltage drop according to the voltage drop of 0.5V, wherein the compensation value may be 0.3V, or may be a coefficient of 1.2, or may be 0.3V and a coefficient of 1.2. If the obtained compensation value is 0.3V, the voltage of the data signal input to the pixel is increased by 0.3V, whereas if the obtained compensation value is a coefficient 1.2, the voltage of the data signal input to the pixel is 0.5V × 1.2 to 0.6V, and if the obtained compensation value is 0.3V and a coefficient 1.2, the voltage of the data signal input to the pixel is 0.5V 1.2+0.3V to 0.9V. Therefore, the voltage for driving the pixels reaches the ideal voltage, so that the display brightness is not enough when the voltage for driving the pixels is insufficient, and the display uniformity and the picture quality are improved.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (9)
1. A voltage compensation method of an Organic Light Emitting Diode (OLED) is characterized by comprising the following steps:
calculating the voltage drop from the power voltage of the pixel farthest from the power input to the power voltage of the power input starting end;
sequentially calculating the voltage drop from the power supply voltage of each pixel to the power supply voltage of the power supply input starting end according to the voltage drop from the power supply voltage of the pixel farthest from the power supply input to the power supply voltage of the power supply input starting end;
acquiring a corresponding compensation value from voltage compensation data bound with the voltage drop according to the voltage drop from the power supply voltage of each pixel to the power supply voltage of the power supply input starting end;
adjusting a voltage of a data signal input to each pixel according to the acquired compensation value;
wherein the calculating a voltage drop from a power voltage of a pixel farthest from a power input to a power voltage of a power input start terminal includes:
if Δ Vi-1-ΔVi-2|<At a preset value, will Δ Vi-1As a voltage drop from the power supply voltage of the pixel farthest from the power supply input in the next frame to the power supply voltage of the power supply input start terminal;
if Δ Vi-1-ΔVi-2When | is larger than the preset value, continuously scanning two frames again until | delta Vi-1-ΔVi-2|<Presetting a value;
wherein, is Δ Vi-1Represents a voltage drop, Δ V, from a power supply voltage of a pixel farthest from a power supply input to a power supply voltage of a power supply input start terminal in a second frame of two framesi-2Which represents a voltage drop from a power supply voltage of a pixel farthest from a power supply input to a power supply voltage of a power supply input start terminal in a first frame of two frames continuously scanned.
2. The method of claim 1, wherein calculating the voltage drop of the power supply voltage of each pixel to the power supply voltage of the power supply input start terminal in turn based on the voltage drop of the power supply voltage of the pixel farthest from the power supply input to the power supply voltage of the power supply input start terminal comprises:
calculating a voltage drop of a power supply voltage between adjacent pixels;
and sequentially calculating the voltage drop from the power supply voltage of each pixel to the power supply voltage of the power supply input starting end according to the voltage drop of the power supply voltage between the adjacent pixels and the voltage drop from the power supply voltage of the pixel farthest from the power supply input to the power supply voltage of the power supply input starting end.
3. The method of claim 2, wherein calculating a voltage drop of a power supply voltage between adjacent pixels comprises:
according to the formula:
wherein, dVjIndicating a voltage drop from a power supply voltage of a pixel j at a power supply voltage position near a power supply input start terminal to a power supply voltage of a pixel j +1 at a power supply voltage position near the power supply input start terminal, InRepresenting flowsCurrent into the nth pixel at the most distant position from the power supply input, Rj+1Represents a resistance encountered in a case where a current flows from the jth pixel at the power supply voltage position near the power supply input start terminal to the jth +1 th pixel at the power supply voltage position near the power supply input start terminal, and n represents a total of a plurality of pixels.
4. A method as claimed in claim 3, wherein the voltage drop of the power supply voltage of each pixel to the power supply voltage at the start of the power supply input in turn, based on the voltage drop of the power supply voltage between the adjacent pixels and the voltage drop of the power supply voltage of the pixel furthest from the power supply input to the power supply voltage at the start of the power supply input, comprises:
according to the formula: Δ Vj＝ΔVj+1-dVj
Wherein, is Δ VjDenotes a voltage drop, Δ V, from the power supply voltage of the jth pixel at a power supply voltage position near the power supply input start terminal to the power supply voltage at the power supply input start terminalj+1Indicating a voltage drop from the power supply voltage of the (j + 1) th pixel at the power supply voltage position near the power supply input start terminal to the power supply voltage at the power supply input start terminal.
5. The method of claim 1, wherein scanning two frames in succession and calculating voltage drops of power supply voltages from pixels farthest from a power supply input to a start of the power supply input, respectively, comprises:
according to the formula: v total _ i-2 ═ n L1 i-2+ (n-1) × L2 i-2+ … + Ln i-2;
V total_i-1＝n*L1 i-1+1+(n-1)*L2 i-1+1+…+Ln_i-1；
Ln＝In×Rn；
wherein V total _ i-2 and V total _ i-1 represent voltage drops of a power supply voltage of a pixel farthest from a power supply input to a power supply voltage of a power supply input start terminal In a first frame and a second frame of two consecutive scans, respectively, n represents an nth pixel of the power supply voltage of the power supply input start terminal, Ln represents a voltage drop between the nth pixel of the power supply voltage of the power supply input start terminal and an nth-1 pixel of the power supply voltage of the power supply input start terminal, i-2 represents the first frame of the two consecutive scans, i-1 represents the second frame of the two consecutive scans, In represents a current flowing to the nth pixel of the power supply voltage of the power supply input start terminal, and Rn represents a resistance encountered by a current flowing from the nth-1 pixel of the power supply voltage of the power supply input start terminal to the nth pixel of the power supply voltage of the power supply input start terminal.
6. The method of claim 4, wherein the voltage drop of the power supply voltage of each pixel to the power supply voltage of the power supply input starting terminal is calculated in turn, and thereafter further comprising:
calculating the voltage drop from the power voltage of the pixel farthest from the power input to the power voltage of the power input starting end;
judging the relation between the voltage drop from the power voltage of the pixel farthest from the power input to the power voltage of the power input starting end and the voltage drop from the pixel farthest from the power input to the power voltage of the power input starting end in the previous frame;
if the | Vtotal _ i-Vtotal _ i-1| < a preset value, taking the Δ Vtotal _ i as the voltage drop from the power voltage of the pixel farthest from the power input to the power voltage of the power input starting end in the next frame;
if the | Vtotal _ i-Vtotal _ i-1| is larger than the preset value, two frames are continuously scanned again, and the voltage drop from the power voltage of the pixel farthest from the power input to the power voltage of the power input starting end in each frame of the two frames is calculated respectively until the | delta Vi-1-ΔVi-2|<Presetting a value;
wherein Vtotal _ i-1 represents a voltage drop from the power supply voltage of the pixel farthest from the power supply input to the power supply voltage of the power supply input start terminal in the previous frame, and Vtotal _ i represents a voltage drop from the power supply voltage of the pixel farthest from the power supply input to the power supply voltage of the power supply input start terminal in the current frame.
7. The method of claim 6, wherein calculating a voltage drop from a power supply voltage of a pixel farthest from a power supply input to a power supply voltage of a start of the power supply input comprises:
according to the formula:
where Vtotal _ i represents the voltage drop from the power supply voltage of the pixel farthest from the power supply input to the power supply voltage of the power supply input start terminal in the current frame, n represents how many pixels in total, and dVjIndicating a voltage drop from the power voltage of the jth pixel at the power voltage position near the power input start terminal to the power voltage of the j +1 th pixel at the power voltage position at the power input start terminal.
8. The method of claim 1, wherein calculating a voltage drop from a power supply voltage of a pixel farthest from a power supply input to a power supply voltage of a start of the power supply input further comprises:
a voltage compensation data table is created that binds to the voltage drop.
9. The method of claim 1, wherein adjusting a voltage of a data signal input to each pixel according to the acquired compensation value comprises:
if the obtained compensation value is a voltage value, adjusting the voltage of the data signal input to each pixel according to the obtained voltage value;
and if the obtained compensation value is a coefficient corresponding to the voltage drop, adjusting the voltage of the data signal input to each pixel according to the obtained coefficient.
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