CN112309330B - Pixel unit driving compensation method and device, display panel and display device - Google Patents
Pixel unit driving compensation method and device, display panel and display device Download PDFInfo
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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]
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Abstract
A pixel unit driving compensation method and device, a display panel and a display device are disclosed. The pixel unit driving compensation method comprises the following steps: determining a target compensation voltage signal of a pixel unit; coarse compensation is performed by a first power supply signal of the pixel unit: determining a first compensation voltage signal, and superposing the first compensation voltage signal on the first power supply signal; the first power supply signal is a signal supplied to a cathode of the light emitting diode; converting the compensation effect of the first compensation voltage signal into the compensation effect of a second compensation voltage signal on the display data signal of the pixel unit according to the input-output relation of the driving circuit of the pixel unit; performing fine compensation through the display data signals of the pixel units: and superposing a voltage difference signal obtained by subtracting the second compensation voltage signal from the target compensation voltage signal on a display data signal. The signal compensation range of the pixel unit can be expanded.
Description
Technical Field
The present disclosure relates to, but not limited to, the field of display technologies, and in particular, to a pixel unit driving compensation method and device, a display panel, and a display device.
Background
With the pursuit of the display quality of an OLED (Organic Light-Emitting Diode) display product by a user, indexes of technical parameters such as resolution, refresh rate, PPI (pixel density) and the like of an OLED panel are higher and higher. It follows that the display problems of OLED pixels are becoming more apparent, and in order to solve these problems, various compensations, such as temperature compensation, OLED aging compensation, etc., are required for the OLED pixels.
One pixel driving compensation method is to superimpose a compensation voltage on the display data signal of the pixel unit. However, under the influence of factors such as process, manufacturing process, cost, etc., the driving compensation range of the OLED pixel is small and the compensation accuracy is low in this compensation mode, and the combination requirements of various compensations such as temperature compensation cannot be met.
Disclosure of Invention
The disclosed embodiment provides a pixel unit driving compensation method, including,
determining a target compensation voltage signal of a pixel unit;
performing coarse compensation by a first power supply signal of the pixel unit: determining a first compensation voltage signal, the first compensation voltage signal being superimposed on the first power supply signal; wherein the first power supply signal is a signal supplied to a cathode of a light emitting diode;
converting the compensation effect of the first compensation voltage signal into the compensation effect of a second compensation voltage signal on the display data signal of the pixel unit according to the input-output relation of the driving circuit of the pixel unit;
performing fine compensation through the display data signals of the pixel units: superposing a voltage difference signal obtained by subtracting the second compensation voltage signal from the target compensation voltage signal on a display data signal;
the pixel unit comprises a light emitting diode and a driving circuit; the display data signal is an input signal of the driving circuit, and the output end of the driving circuit is connected with the anode of the light emitting diode.
The disclosed embodiment provides a pixel unit driving compensation device, which comprises,
a display drive and compensation control module configured to determine a target compensation voltage signal for the pixel cell; performing coarse compensation by a first power supply signal of the pixel unit: determining a first compensation voltage signal, superimposing the first compensation voltage signal on the first power supply signal; wherein the first power supply signal is a signal supplied to a cathode of a light emitting diode; converting the compensation effect of the first compensation voltage signal into the compensation effect of a second compensation voltage signal on the display data signal of the pixel unit according to the input-output relation of the driving circuit of the pixel unit; performing fine compensation through the display data signals of the pixel units: superposing a voltage difference signal obtained by subtracting the second compensation voltage signal from the target compensation voltage signal on a display data signal; outputting the compensated display data signal to the anode driving module, and outputting the compensated first power supply signal to the cathode driving module;
the anode driving module is connected with the anode of the light-emitting diode and is configured to output a driving signal to the anode of the light-emitting diode under the control of the display driving and compensation control module;
the cathode driving module is connected with the cathode of the light-emitting diode and is configured to output the compensated first power supply signal to the cathode of the light-emitting diode under the control of the display driving and compensation control module;
the pixel unit comprises a light emitting diode and a driving circuit; the display data signal is an input signal of the driving circuit, and the output end of the driving circuit is connected with the anode of the light emitting diode.
An embodiment of the present disclosure provides a display panel, including: the pixel unit drives the compensation device.
An embodiment of the present disclosure provides a display device, including: the display panel is provided.
According to the pixel unit driving compensation method and device, the display panel and the display device provided by the embodiment of the disclosure, the signal coarse compensation is performed on the cathode of the light emitting diode (the coarse compensation is performed through the first power signal of the pixel unit), the signal fine compensation is performed on the anode of the light emitting diode (the fine compensation is performed through the display data signal of the pixel unit), and the limitation of the limited output voltage range of the display data signal on the signal compensation range of the pixel unit can be avoided, so that the signal compensation range of the pixel unit is expanded, and the accuracy of the signal compensation is improved.
Drawings
The accompanying drawings are included to provide an understanding of the disclosed embodiments and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the examples serve to explain the principles of the disclosure and not to limit the disclosure.
Fig. 1 is a schematic structural diagram of a pixel unit according to an embodiment of the disclosure;
fig. 2 is an equivalent circuit diagram of a pixel unit driving circuit according to an embodiment of the disclosure;
fig. 3 is a flowchart of a pixel unit driving compensation method according to an embodiment of the disclosure;
fig. 4 is a schematic structural diagram of a pixel unit driving compensation device according to an embodiment of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. Note that the embodiments may be implemented in a plurality of different forms. Those skilled in the art can readily appreciate the fact that the forms and details may be varied into a variety of forms without departing from the spirit and scope of the present disclosure. Therefore, the present disclosure should not be construed as being limited to the contents described in the following embodiments. The embodiments and features of the embodiments in the present disclosure may be arbitrarily combined with each other without conflict.
In the drawings, the size of each component, the thickness of layers, or regions may be exaggerated for clarity. Therefore, one aspect of the present disclosure is not necessarily limited to the dimensions, and the shapes and sizes of the respective components in the drawings do not reflect a true scale. Further, the drawings schematically show ideal examples, and one embodiment of the present disclosure is not limited to the shapes, numerical values, and the like shown in the drawings.
The ordinal numbers such as "first", "second", "third", and the like in the present specification are provided for avoiding confusion among the constituent elements, and are not limited in number.
In this specification, the terms "mounted," "connected," and "connected" are to be construed broadly unless otherwise specifically indicated and limited. For example, it may be a fixed connection, or a removable connection, or an integral connection; can be a mechanical connection, or an electrical connection; either directly or indirectly through intervening components, or both may be interconnected. The specific meaning of the above terms in the present disclosure can be understood in specific instances by those of ordinary skill in the art.
In this specification, a transistor refers to an element including at least three terminals, i.e., a gate electrode, a drain electrode, and a source electrode. The transistor has a channel region between a drain electrode (drain electrode terminal, drain region, or drain electrode) and a source electrode (source electrode terminal, source region, or source electrode), and current can flow through the drain electrode, the channel region, and the source electrode. Note that in this specification, a channel region refers to a region where current mainly flows.
In this specification, "electrically connected" includes a case where constituent elements are connected together by an element having some kind of electrical action. The "element having a certain electric function" is not particularly limited as long as it can transmit and receive an electric signal between connected components. Examples of the "element having some kind of electric function" include not only an electrode and a wiring but also a switching element such as a transistor, a resistor, an inductor, a capacitor, other elements having various functions, and the like.
In the present specification, "film" and "layer" may be interchanged with each other. For example, the "conductive layer" may be sometimes replaced with a "conductive film". Similarly, the "insulating film" may be replaced with an "insulating layer".
"about" in this disclosure means that the limits are not strictly defined, and that the numerical values are within the tolerances allowed for the process and measurement.
Further, in the description of the embodiments of the present disclosure, the terms "first level" and "second level" are used only to distinguish that the amplitudes of the two levels are different.
Fig. 1 shows a schematic structural diagram of a pixel unit including a light emitting diode D1 and a driving circuit. The light emitting diode includes a cathode and an anode. The driving circuit comprises at least three input ends and an output end; the cathode of the light emitting diode is connected with a first power supply signal VSS end, the anode of the light emitting diode is connected with the output end of the driving circuit, the first input end of the driving circuit is connected with a display DATA signal DATA end, the second input end of the driving circuit is connected with a GATE control signal GATE end, and the third input end of the driving circuit is connected with a second power supply signal VDD end. The display data signal terminal can provide a display data signal, and the gate control signal terminal can provide a row gate signal of a pixel row where the pixel unit is located. The first power signal terminal provides a first power signal, and the second power signal terminal provides a second power signal.
The driving circuit of the light emitting diode may include various combinations of transistors and capacitors. For example, 2T1C (two transistors and one storage capacitor), 3T1C (three transistors and one storage capacitor), 5T1C (five transistors and one storage capacitor), 7T1C (seven transistors and one storage capacitor), 7T2C (seven transistors and two storage capacitors), and the like.
Due to the diversity of the combination of transistors and capacitors, the number and types of input signals for the led driving circuit also vary. For example, the driving circuit of the light emitting diode can be connected to other input control signal terminals. Other input control signal terminals such as: an emission control signal EM terminal, a RESET signal RESET terminal, and the like. In some exemplary embodiments, the emission control signal provided by the emission control signal EM terminal is used to control the on/off of the light emitting diode, and the RESET signal provided by the RESET signal RESET terminal is used to RESET the gate voltage of the driving transistor.
Fig. 2 is a diagram showing an internal structure of a driving circuit of a light emitting diode, the driving circuit including: a first transistor T1, a second transistor T2, and a capacitor C1; a first electrode of the first transistor T1 is connected to the DATA terminal of the display DATA signal, a second electrode of T1 is connected to the first node N1, and a control electrode of T1 is connected to the GATE control signal GATE terminal; a first electrode of the second transistor T2 is connected to the second power signal VDD terminal, a second electrode of T2 is connected to the anode of the light emitting diode, and a control electrode of T2 is connected to the first node N1; a first pole of the capacitor C1 is connected to a first node N1, and a second pole of the capacitor C1 is connected to an anode of the light emitting diode.
As shown in fig. 3, an embodiment of the present disclosure provides a pixel cell driving compensation method, including,
step S10, determining a target compensation voltage signal of the pixel unit;
step S20, performing coarse compensation by the first power signal of the pixel unit: determining a first compensation voltage signal, the first compensation voltage signal being superimposed on the first power supply signal; wherein the first power supply signal is a signal supplied to a cathode of a light emitting diode;
step S30, converting the compensation effect of the first compensation voltage signal into the compensation effect of the second compensation voltage signal on the display data signal of the pixel unit according to the input-output relationship of the driving circuit of the pixel unit;
step S40, performing fine compensation by the display data signal of the pixel cell: superposing a voltage difference signal obtained by subtracting the second compensation voltage signal from the target compensation voltage signal on a display data signal;
the pixel unit comprises a light emitting diode and a driving circuit; the display data signal is an input signal of the driving circuit, and the output end of the driving circuit is connected with the anode of the light emitting diode.
In the above embodiments of the present disclosure, a target compensation voltage signal of a pixel unit is determined, a first compensation voltage signal is superimposed on the first power supply signal, a compensation effect of the first compensation voltage signal is converted into a compensation effect of a second compensation voltage signal on a display data signal of the pixel unit according to an input-output relationship of a driving circuit of the pixel unit, and a voltage difference signal obtained by subtracting the second compensation voltage signal from the target compensation voltage signal is superimposed on the display data signal. In the above embodiment, the signal coarse compensation is performed on the cathode of the light emitting diode (the coarse compensation is performed by the first power signal of the pixel unit), and the signal fine compensation is performed on the anode of the light emitting diode (the fine compensation is performed by the display data signal of the pixel unit), so that the limitation of the limited output voltage range of the display data signal on the signal compensation range of the pixel unit can be avoided, the signal compensation range of the pixel unit is expanded, and the accuracy of the signal compensation is improved.
For example, the maximum output range of the display data signal is 0 to 6V, and in general, the output range of the display data signal is 0 to 5V when the compensation signal is not added, and when the display data signal outputs 5V, only the compensation margin of 1V is provided. When the compensation signals are of various types, the combination of the compensation signals may cause the voltage value of the compensation signal to exceed 1V (for example, up to 3V), and in this case, if only the display data signal is used for single signal compensation, the compensation requirements of the compensation signals cannot be met. By adopting the dual-signal compensation mode, when the output of the display data signal is 5V, if the voltage value of the compensation signal reaches 3V, the voltage value of about 2V can be compensated at the cathode of the light emitting diode, and the voltage value of about 1V is reserved and can be compensated by the display data signal, so that the signal compensation range of the pixel unit is greatly expanded. Compared with the single signal compensation mode, the dual signal compensation mode can reduce the compensation voltage value range borne by the display data signal, so that the compensation precision can be improved.
In some exemplary embodiments, the target compensation voltage signal is a voltage signal that needs to be superimposed on the display data signal when compensation is performed only by the display data signal of the pixel unit. That is, the compensation signal superimposed on the display data signal is required when the compensation is performed only using the display data signal, instead of using the first power supply signal and the display data signal for simultaneous compensation.
In some exemplary embodiments, determining the first compensated voltage signal includes:
determining a voltage value interval corresponding to a voltage value delta U of a target compensation voltage signal, and determining the voltage value delta U of a first compensation voltage signal according to a preset voltage value corresponding to the voltage value interval1；
Wherein, each voltage value interval corresponds to a preset voltage value.
For example, when Δ U ≦ a1While, the first compensation voltage value DeltaU1＝b1(ii) a When a is1＜ΔU≤a2While, the first compensation voltage value DeltaU1＝b2(ii) a When a is2＜ΔU≤a3While, the first compensation voltage value DeltaU1＝b3(ii) a When a isi-1＜ΔU≤aiWhile, the first compensation voltage value DeltaU1＝bi。
In some exemplary embodiments, the first power signal before compensation may be a signal of a fixed voltage value.
In some exemplary embodiments, the cathode driving voltages (first power signals) of all the pixel units on the panel may be uniformly provided by the external power control chip, and the anode driving voltages of the respective pixel units on the panel may be controlled by the respectively required display data signals according to the row selection and column selection coordinate positions where the pixel units are located.
The coarse compensation is performed by the first power signal of the pixel unit, and all pixels can compensate the same first compensation voltage signal together. The external driving chip generates a voltage (U) required by the coarse adjustment compensation of the first power supply signal by the power control module according to the control data and the instruction of the compensation algorithm1+ΔU1) Performing coarse adjustment compensation on cathodes of all pixels on the panel; wherein, U1Is the voltage value, Δ U, of the first power supply signal before compensation1Is the voltage value of the first compensation voltage signal.
In some exemplary embodiments, converting the compensation effect of the first compensation voltage signal into the compensation effect of the second compensation voltage signal on the display data signal of the pixel unit according to the input-output relationship of the driving circuit of the pixel unit includes:
calculating a voltage value DeltaU of the second compensation voltage signal by the following formula (1)2：
ΔU2＝k*(-ΔU1)+a (1)
Wherein, Delta U1Is the voltage value of the first compensation voltage signal, (- Δ U)1) Is a voltage value of an inverted signal of the first compensation voltage signal, k is a coefficient, and a is a constant term. The inverted signal of the first compensation voltage signal is a signal that is the same magnitude but opposite direction as the first compensation voltage signal.
The values of the coefficient k and the constant term a are values that can be predetermined according to the input-output characteristics of the drive circuit. For example, the constant a and the coefficient k may be determined experimentally or calculated.
In some exemplary embodiments, for example, in the driving circuit shown in fig. 2, the gate of the driving transistor T2 is connected to the first node N1, the drain of T2 is connected to the second power signal VDD, and the source of T2 is connected to the anode of the light emitting diode. When the driving transistor operates in the source follower mode, the source voltage of the driving transistor changes following the change of the gate voltage, that is, the gate voltage (U) of the driving transistorG) And source voltage (U)S) Can satisfy the following linear relationship: u shapeG＝a0*US+a1. Wherein, a0Is a coefficient of1Is a constant term. Coefficient a0And constant term a1Is determined by the device characteristics of the drive transistor. It can be derived from the voltage relationship between the gate and the source of the driving transistor that the input-output relationship of the driving circuit satisfies the following formula (2):
ΔUi＝a0*ΔUo+a1 (2)
wherein, Delta UiIs the voltage variation, DeltaU, of the input terminal (display data signal terminal) of the driving circuitoIs the voltage variation at the output of the driver circuit. In combination with the connection relationship between the driving circuit and the light emitting diode, Δ U in formula (2)oIs the voltage value (-DeltaU) of the inverse signal of the first compensated voltage signal1) Δ U in formula (2)iIs the voltage value (Δ U) of the second compensation voltage signal2) The second compensation voltage signal is an equivalent incremental signal which is a function of the inverse of said first compensation voltage signal applied to the output of the driver circuit and which is a function of the input signal applied to the input of the driver circuit.
In other embodiments, the input and output of the driver circuit may be other functional relationships that may be predetermined by experimental measurement or calculation.
In some exemplary embodiments, superimposing a voltage difference signal obtained by subtracting the second compensation voltage signal from the target compensation voltage signal on a display data signal includes:
will display the present voltage value U of the data signalDATASubtracting the voltage value DeltaU of the second compensation voltage signal2And the voltage value obtained after adding the voltage value delta U of the target compensation voltage signal is used as the voltage value U after the display data signal is compensatedDATA'，UDATA'＝UDATA-ΔU2+ΔU；
The current voltage value of the display data signal is the voltage value of the luminance of the driving pixel unit calculated according to the image display signal output by the front-end system.
In some exemplary embodiments, any one pixel unit on the panel may independently calculate a compensation voltage value of a desired display data signal. The external driving chip provides the current voltage value U corresponding to a certain pixel unit on the panel according to the row selection and column selection coordinate position of the pixel unitDATAVoltage value delta U of compensation signal or combination of compensation signals and voltage value delta U of second compensation voltage signal2. Wherein the voltage value Δ U of the compensation signal or the combination of the compensation signals may be data pre-stored in a memory of the external driving chip, and the voltage value Δ U of the second compensation voltage signal2Is a voltage value (-DeltaU) of an inverted signal based on the first compensation voltage signal1) The calculated voltage value U finally outputted on the display data signal of the pixel unitDATA' is: u shapeDATA'＝UDATA-ΔU2+ΔU。
In some exemplary embodiments, the target compensation voltage signal comprises any one or combination of the following voltage signals:
a temperature compensation voltage signal, a transistor threshold compensation voltage signal, a transistor uniformity compensation voltage signal, and a light emitting diode aging compensation voltage signal. In other embodiments, the target compensation voltage signal may also include other compensation voltage signals.
For example, when the target compensation voltage signalWhen the signal includes combinations of M kinds of compensation signals, the voltage value Δ U of the target compensation voltage signal may be the voltage value Δ U of the M kinds of compensation signalsiThe sum of (1); Δ U ═ Δ U1+Δu2+...,+ΔuM. Wherein i is more than or equal to 1 and less than or equal to M.
In some exemplary embodiments, the light emitting diode is an organic light emitting diode OLED.
In some exemplary embodiments, the transistor includes: a TFT (Thin Film Transistor).
As shown in fig. 4, an embodiment of the present disclosure provides a pixel unit driving compensation apparatus, including,
a display driving and compensation control module 10 configured to determine a target compensation voltage signal of the pixel unit; performing coarse compensation by a first power supply signal of the pixel unit: determining a first compensation voltage signal, superimposing the first compensation voltage signal on the first power supply signal; wherein the first power supply signal is a signal supplied to a cathode of a light emitting diode; converting the compensation effect of the first compensation voltage signal into the compensation effect of a second compensation voltage signal on the display data signal of the pixel unit according to the input-output relation of the driving circuit of the pixel unit; performing fine compensation through the display data signals of the pixel units: superposing a voltage difference signal obtained by subtracting the second compensation voltage signal from the target compensation voltage signal on a display data signal; outputting the compensated display data signal to the anode driving module, and outputting the compensated first power supply signal to the cathode driving module;
an anode driving module 20 connected to the anode of the light emitting diode and configured to output a driving signal to the anode of the light emitting diode under the control of the display driving and compensation control module;
a cathode driving module 30 connected to the cathode of the light emitting diode and configured to output the compensated first power signal to the cathode of the light emitting diode under the control of the display driving and compensation control module;
the pixel unit comprises a light emitting diode and a driving circuit; the display data signal is an input signal of the driving circuit, and the output end of the driving circuit is connected with the anode of the light emitting diode.
In the above embodiments of the present disclosure, the pixel unit driving compensation apparatus includes a display driving and compensation control module, an anode driving module and a cathode driving module. The display driving and compensating control module determines a target compensating voltage signal of a pixel unit, superposes a first compensating voltage signal on the first power supply signal, converts the compensating action of the first compensating voltage signal into the compensating action of a second compensating voltage signal on a display data signal of the pixel unit according to the input-output relation of a driving circuit of the pixel unit, and superposes a voltage difference signal obtained by subtracting the second compensating voltage signal from the target compensating voltage signal on the display data signal; and outputting the compensated display data signal to the anode driving module, and outputting the compensated first power supply signal to the cathode driving module. And the anode driving module is connected with the anode of the light-emitting diode and is configured to output a driving signal to the anode of the light-emitting diode under the control of the display driving and compensation control module. And the cathode driving module is connected with the cathode of the light-emitting diode and is configured to output the compensated first power supply signal to the cathode of the light-emitting diode under the control of the display driving and compensation control module. The three modules are matched to perform signal coarse compensation on the cathode of the light-emitting diode (perform coarse compensation through the first power signal of the pixel unit), perform signal fine compensation on the anode of the light-emitting diode (perform fine compensation through the display data signal of the pixel unit), and avoid the limitation of the limited output voltage range of the display data signal on the signal compensation range of the pixel unit, so that the signal compensation range of the pixel unit is expanded, and the precision of the signal compensation is improved.
In some exemplary embodiments, the display driving and compensation control module is configured to determine the first compensation voltage signal in the following manner: determining a voltage value interval corresponding to a voltage value delta U of a target compensation voltage signal, and determining the voltage value delta U of a first compensation voltage signal according to a preset voltage value corresponding to the voltage value interval1(ii) a Wherein each electricityThe voltage value interval corresponds to a preset voltage value.
In some exemplary embodiments, the display driving and compensation control module is configured to convert the compensation effect of the first compensation voltage signal into the compensation effect of the second compensation voltage signal on the display data signal of the pixel unit according to the input-output relationship of the driving circuit of the pixel unit in the following manner:
calculating a voltage value DeltaU of the second compensation voltage signal by the following formula (1)2：
ΔU2＝k*(-ΔU1)+a (1)
Wherein, Delta U1Is the voltage value of the first compensation voltage signal, (- Δ U)1) Is a voltage value of an inverted signal of the first compensation voltage signal, k is a coefficient, and a is a constant term.
In some exemplary embodiments, the target compensation voltage signal comprises any one or combination of the following voltage signals: a temperature compensation voltage signal, a transistor threshold compensation voltage signal, a transistor uniformity compensation voltage signal, and a light emitting diode aging compensation voltage signal. In other embodiments, the target compensation voltage signal may also include other compensation voltage signals.
In some exemplary embodiments, the light emitting diode is an organic light emitting diode OLED.
The embodiment of the present disclosure further provides a display panel, which includes the pixel unit driving compensation device provided by the embodiment of the present disclosure.
In some exemplary embodiments, all pixel units of the display panel may share the same cathode driving module and the same display driving and compensation control module, and each pixel unit may independently have a respective anode driving module. The display driving and compensating control module can determine the display data signal of a certain pixel unit according to the row selection and column selection coordinate position of the pixel unit and output the display data signal to the anode driving module of the pixel unit.
The embodiment of the disclosure also provides a display device, which comprises the display panel provided by the embodiment of the disclosure. For a description of the display device, reference is made to the foregoing embodiments.
The display device provided by the embodiment of the present disclosure may be an organic light emitting display device. The display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Other essential components of the display device are understood by those skilled in the art, and are not described herein nor should they be construed as limiting the present disclosure.
Although the embodiments disclosed in the present disclosure are described above, the descriptions are only for the convenience of understanding the present disclosure, and are not intended to limit the present disclosure. It will be understood by those skilled in the art of the present disclosure that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure, and that the scope of the disclosure is to be limited only by the terms of the appended claims.
Claims (8)
1. A pixel cell drive compensation method includes,
determining a target compensation voltage signal of a pixel unit;
performing coarse compensation by a first power supply signal of the pixel unit: determining a first compensation voltage signal, the first compensation voltage signal being superimposed on the first power supply signal; wherein the first power supply signal is a signal supplied to a cathode of a light emitting diode;
converting the compensation effect of the first compensation voltage signal into the compensation effect of a second compensation voltage signal on the display data signal of the pixel unit according to the input-output relation of the driving circuit of the pixel unit;
performing fine compensation through the display data signals of the pixel units: superposing a voltage difference signal obtained by subtracting the second compensation voltage signal from the target compensation voltage signal on a display data signal;
the pixel unit comprises a light emitting diode and a driving circuit; the display data signal is an input signal of the driving circuit, and the output end of the driving circuit is connected with the anode of the light emitting diode;
the determining a first compensated voltage signal includes:
determining a voltage value interval corresponding to a voltage value delta U of a target compensation voltage signal, and determining the voltage value delta U of a first compensation voltage signal according to a preset voltage value corresponding to the voltage value interval1(ii) a Wherein, each voltage value interval corresponds to a preset voltage value.
2. The method of claim 1, wherein:
converting the compensation effect of the first compensation voltage signal into the compensation effect of a second compensation voltage signal on the display data signal of the pixel unit according to the input-output relationship of the driving circuit of the pixel unit, and the method comprises the following steps:
calculating a voltage value DeltaU of the second compensation voltage signal by the following formula (1)2：
ΔU2＝k*(-ΔU1)+a (1)
Wherein, (-. DELTA.U)1) Is a voltage value of an inverted signal of the first compensation voltage signal, k is a coefficient, and a is a constant term.
3. The method of claim 1, wherein:
the target compensation voltage signal comprises any one or combination of the following voltage signals:
a temperature compensation voltage signal, a transistor threshold compensation voltage signal, a transistor uniformity compensation voltage signal, and a light emitting diode aging compensation voltage signal.
4. The method of claim 1, wherein:
the light emitting diode is an Organic Light Emitting Diode (OLED).
5. A pixel cell drive compensation arrangement, comprising:
a display drive and compensation control module configured to determine a target compensation voltage signal for the pixel cell; performing coarse compensation by a first power supply signal of the pixel unit: determining a first compensation voltage signal, superimposing the first compensation voltage signal on the first power supply signal; wherein the first power supply signal is a signal supplied to a cathode of a light emitting diode; converting the compensation effect of the first compensation voltage signal into the compensation effect of a second compensation voltage signal on the display data signal of the pixel unit according to the input-output relation of the driving circuit of the pixel unit; performing fine compensation through the display data signals of the pixel units: superposing a voltage difference signal obtained by subtracting the second compensation voltage signal from the target compensation voltage signal on a display data signal; outputting the compensated display data signal to the anode driving module, and outputting the compensated first power supply signal to the cathode driving module;
the anode driving module is connected with the anode of the light-emitting diode and is configured to output a driving signal to the anode of the light-emitting diode under the control of the display driving and compensation control module;
the cathode driving module is connected with the cathode of the light-emitting diode and is configured to output the compensated first power supply signal to the cathode of the light-emitting diode under the control of the display driving and compensation control module;
the pixel unit comprises a light emitting diode and a driving circuit; the display data signal is an input signal of the driving circuit, and the output end of the driving circuit is connected with the anode of the light emitting diode;
the display driving and compensating control module is configured to determine the first compensating voltage signal in the following manner: determining a voltage value interval corresponding to a voltage value delta U of a target compensation voltage signal, and determining the voltage value delta U of a first compensation voltage signal according to a preset voltage value corresponding to the voltage value interval1(ii) a Wherein, each voltage value interval corresponds to a preset voltage value.
6. The apparatus of claim 5, wherein:
a display driving and compensation control module configured to convert the compensation effect of the first compensation voltage signal into the compensation effect of a second compensation voltage signal on the display data signal of the pixel unit according to the input-output relationship of the driving circuit of the pixel unit in the following manner:
calculating a voltage value DeltaU of the second compensation voltage signal by the following formula (1)2：
ΔU2＝k*(-ΔU1)+a (1)
Wherein, (-. DELTA.U)1) Is a voltage value of an inverted signal of the first compensation voltage signal, k is a coefficient, and a is a constant term.
7. A display panel, comprising: a pixel cell drive compensation arrangement according to claim 5 or 6.
8. A display device, comprising: the display panel of claim 7.
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| US10607542B2 (en) * | 2013-12-31 | 2020-03-31 | Kunshan New Flat Panel Display Technology Center Co., Ltd. | Pixel circuit, pixel, and AMOLED display device comprising pixel and driving method thereof |
| CN105047137B (en) * | 2015-09-09 | 2017-05-31 | 深圳市华星光电技术有限公司 | AMOLED real-time compensation systems |
| CN105931600A (en) * | 2016-07-08 | 2016-09-07 | 京东方科技集团股份有限公司 | AMOLED (active-matrix organic light emitting diode) display device and compensation method thereof |
| US10832627B2 (en) * | 2016-07-14 | 2020-11-10 | Novatek Microelectronics Corp. | Display apparatus and source driver thereof and operating method |
| CN106504706B (en) * | 2017-01-05 | 2019-01-22 | 上海天马有机发光显示技术有限公司 | Organic light emitting display panel and pixel compensation method |
| CN106652907B (en) * | 2017-01-05 | 2019-02-05 | 上海天马有机发光显示技术有限公司 | Organic light emitting display panel, organic light-emitting display device and pixel compensation method |
| CN107016965B (en) * | 2017-05-26 | 2019-04-30 | 深圳市华星光电半导体显示技术有限公司 | The compensation method of the OVSS voltage drop of OLED display and pixel-driving circuit |
| US20190019457A1 (en) * | 2017-07-11 | 2019-01-17 | Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Display device and method of driving the same |
| CN111445852A (en) * | 2020-05-06 | 2020-07-24 | Oppo广东移动通信有限公司 | Pixel compensation circuit, display device and compensation method |
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