CN107039001B - Gray scale compensation circuit and gray scale compensation method - Google Patents
Gray scale compensation circuit and gray scale compensation method Download PDFInfo
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- CN107039001B CN107039001B CN201710396707.2A CN201710396707A CN107039001B CN 107039001 B CN107039001 B CN 107039001B CN 201710396707 A CN201710396707 A CN 201710396707A CN 107039001 B CN107039001 B CN 107039001B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- 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]
- G09G3/3225—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] using an active matrix
- G09G3/3258—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] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
Abstract
The application discloses grey scale compensation circuit of organic light emitting display panel and be applied to grey scale compensation method of grey scale compensation circuit, grey scale compensation circuit includes: the signal acquisition unit is used for converting the acquired light-emitting current signals of the organic light-emitting diodes in each organic light-emitting diode array into data voltage signals; the voltage compensation unit generates a difference voltage based on the data voltage signal transmitted by the signal acquisition unit and provides the difference voltage as a compensation voltage to the gray scale generation unit; and a gray scale generation unit which generates a voltage value corresponding to a gray scale value of each organic light emitting diode based on the compensation voltage and supplies the voltage value to a pixel circuit of the organic light emitting display panel. The gray scale compensation circuit can more accurately compensate the display gray scale of the organic light emitting diode by arranging the signal acquisition unit, the voltage compensation unit and the gray scale generation unit, so that the compensation precision of the display gray scale is improved, and the display effect of the display panel is improved.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a gray scale compensation circuit of an organic light emitting display panel and a gray scale compensation method applied to the gray scale compensation circuit.
Background
With the development of display technology, the demand of people for display panels is gradually increasing. In order to improve the accuracy of the display gray scale of the organic light emitting display panel, a detection device is usually required to be disposed on the display surface to verify the display gray scale of each frame of picture. The existing display gray scale verification technology generally utilizes a gray scale verification device to verify the average gray scale brightness value and the color coordinate of a display frame.
However, in the case of low gray scale brightness, the existing detection device is influenced by the detection device itself, so that a certain error exists in the actually measured display gray scale value. In addition, the existing gray scale detection usually requires an external CCD (Charge-coupled Device) sensor to detect, and the accuracy of the gray scale value usually also needs to depend on the detection precision of the CCD sensor. Therefore, the accuracy of checking the display gray scale is reduced, and the display effect of the display panel is influenced.
Disclosure of Invention
In view of the above-mentioned defects or shortcomings in the prior art, it is desirable to provide a gray scale compensation circuit of an organic light emitting display panel and a gray scale compensation method applied to the gray scale compensation circuit, so as to solve the technical problems in the prior art.
In a first aspect, an embodiment of the present application provides a gray scale compensation circuit for an organic light emitting display panel, where the organic light emitting display panel includes an organic light emitting diode array, and the organic light emitting diode array is divided into a plurality of sub-arrays, and the gray scale compensation circuit includes: the signal acquisition unit comprises a plurality of input ends, each input end is used for acquiring a light-emitting current signal of an organic light-emitting diode in one sub-array of the organic light-emitting diode array and converting the light-emitting current signal into a data voltage signal corresponding to the light-emitting current signal one by one, and the display gray scales of the organic light-emitting diodes in any one sub-array are the same; the voltage compensation unit is electrically connected with the signal acquisition unit and used for comparing each data voltage signal with a target voltage value under the same gray scale in a pre-stored gray scale-voltage data table based on the data voltage signal transmitted by the signal acquisition unit and providing the compared difference voltage serving as compensation voltage to the gray scale generation unit; and the input end of the gray scale generation unit is electrically connected with the voltage compensation unit, the output end of the gray scale generation unit is connected to the pixel circuit of the organic light-emitting display panel, and the gray scale generation unit is used for generating a voltage value corresponding to the gray scale value of each organic light-emitting diode based on the compensation voltage and providing the voltage value to the pixel circuit of the organic light-emitting display panel.
In a second aspect, an embodiment of the present application provides a gray scale compensation method applied to a gray scale compensation circuit, where the gray scale compensation circuit is applied to an organic light emitting display panel, the organic light emitting display panel includes an organic light emitting diode array, and the organic light emitting diode array is divided into a plurality of sub-arrays, where the method includes: responding to the organic light emitting display panel entering a gray scale compensation mode, executing a gray scale compensation step: acquiring current signals of organic light emitting diodes in each sub array in the organic light emitting diode array; respectively converting the current signals of the organic light emitting diodes into data voltage signals; comparing the data voltage signals with target voltage values under the same gray scale in a pre-stored gray scale-voltage data table, and determining voltage difference values between the data voltage signals and the target voltage values; comparing each voltage difference value with a preset voltage difference threshold range, and detecting whether the voltage difference value exceeds the voltage difference threshold range; responding to the voltage difference value not exceeding the voltage difference threshold range, processing each voltage difference value as a feedback voltage through a gray scale generation unit, generating a voltage corresponding to the gray scale value of each organic light emitting diode, and providing the voltage to a pixel circuit of the organic light emitting display panel; and responding to the voltage difference value exceeding the voltage difference threshold range, processing each voltage difference value as a feedback voltage by the gray scale generation unit, generating a voltage corresponding to the gray scale value of each organic light emitting diode, providing the voltage to the pixel circuit of the organic light emitting display panel, and continuing to perform gray scale compensation.
According to the gray scale compensation circuit and the gray scale compensation method provided by the embodiment of the application, the signal acquisition unit is arranged to acquire the light-emitting current signal of the organic light-emitting diode, the voltage compensation unit is arranged to compare the actual voltage difference value with the preset target voltage value, the gray scale voltage of the organic light-emitting diode is compensated, the compensation voltage is provided to the gray scale generation unit, and the gray scale generation unit generates the voltage value corresponding to the gray scale value of the organic light-emitting diode based on the compensation voltage and provides the voltage value to the pixel circuit of the organic light-emitting display panel. Therefore, the display gray scale of the organic light emitting diode in the pixel circuit can be accurately compensated, and the display precision of the organic light emitting display panel is improved. In addition, the embodiment provided by the application does not need to arrange a CCD sensor to detect the gray-scale value, so that the error caused by the accuracy of external equipment is reduced.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram of an embodiment of a gray scale compensation circuit;
fig. 2 is a schematic diagram illustrating an application scenario corresponding to the embodiment shown in fig. 1 and provided by an embodiment of the present application;
FIG. 3 is a schematic diagram showing a structure of a gray scale compensation circuit according to another embodiment of the present application;
FIG. 4 illustrates a schematic diagram of a current-to-voltage conversion module of the present application;
FIG. 5 is a schematic diagram showing a structure of a gray scale compensation circuit according to still another embodiment of the present application;
FIG. 6 shows a schematic diagram of an application scenario corresponding to the embodiment shown in FIG. 5;
fig. 7 is a schematic flow chart illustrating a gray scale compensation method applied to the gray scale compensation circuit shown in fig. 1.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant application and are not limiting of the application. It should be noted that, for convenience of description, only the portions related to the present application are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1, a schematic structural diagram of an embodiment of a gray scale compensation circuit provided in the present application is shown.
The gray scale compensation circuit is applied to an organic light emitting display panel, and the organic light emitting display panel comprises an organic light emitting diode array which can be divided into a plurality of sub-arrays.
As shown in fig. 1, the gray scale compensation circuit 100 includes a signal acquisition unit 11, a voltage compensation unit 12, and a gray scale generation unit 13.
The signal acquisition unit 11 includes a plurality of input terminals 111, wherein each input terminal 111 is electrically connected to the organic light emitting diode in one of the sub-arrays. The signal collecting unit 11 is configured to collect light emitting current signals of the organic light emitting diodes in one sub-array of the organic light emitting diode array, and convert the light emitting current signals into data voltage signals corresponding to each of the light emitting current signals. In this embodiment, the display gray scales of the organic light emitting diodes in any one sub-array are the same. The signal collecting unit 11 may collect a light emitting current signal of one organic light emitting diode in the same sub-array, or collect a plurality of light emitting current signals corresponding to a plurality of different organic light emitting diodes in the same sub-array. The embodiment can perform gray scale compensation on the display gray scale of the organic light emitting diode by collecting the current value of the organic light emitting diode, and avoid the increase of measurement errors caused by directly detecting the brightness and color coordinates of a gray scale white picture, thereby improving the detection precision.
In this embodiment, the voltage compensation unit 12 is electrically connected to the signal acquisition unit 11. The voltage compensation unit 12 stores a plurality of gray scale-voltage data tables determined by testing in advance, and the gray scale-voltage data tables record the corresponding relationship between the gray scale values and the target voltage values, that is, the target voltage values to which the data voltages provided to the organic light emitting diodes are to reach at a certain gray scale value. Wherein different frames of display frames correspond to different gray scale-voltage data tables. When gray scale compensation is carried out on the light-emitting display panel, a gray scale-voltage data table which needs to be referred to can be determined according to a selected certain frame picture.
In this embodiment, the voltage compensation unit 12 compares the data voltage signal 12 provided by the signal acquisition unit 11 with a target voltage value in a pre-stored gray scale-voltage data table, which is the same as the acquired display gray scale of the organic light emitting diode, based on the data voltage signal transmitted by the signal acquisition unit 11, and simultaneously provides the compared difference voltage as a compensation voltage to the gray scale generation unit 13.
The input terminal of the gray scale generating unit 13 is electrically connected to the voltage compensating unit 12. The gray scale generating unit 13 generates a voltage value corresponding to a gray scale value of the organic light emitting diode based on the compensation voltage supplied from the voltage compensating unit 12 and supplies the voltage value to the pixel circuit of the organic light emitting display panel.
The gray scale compensation circuit converts the collected light-emitting current signals of the organic light-emitting diode into the data voltage signals by arranging the signal collection unit 11, the voltage compensation unit 12 and the gray scale generation unit 13, compares the voltage value of the data voltage signals with the target voltage value, and provides the compared voltage difference to the gray scale generation unit, so that the display gray scale of the organic light-emitting diode is compensated based on the light-emitting current signals of the organic light-emitting diode, and the compensation precision of the organic light-emitting diode is improved.
Please refer to fig. 2, which illustrates an application scenario diagram corresponding to the embodiment shown in fig. 1 provided in the present application.
In the application scenario as shown in fig. 2, the display panel 200 includes an organic light emitting diode array divided into sub-arrays 1-16, and the organic light emitting diodes in each sub-array 1-16 have the same display gray scale.
In the application scenario shown in fig. 2, the display gray scales of any two sub-arrays are different. Each sub-array has an organic light emitting diode electrically connected to the signal collecting unit 21, and the signal collecting unit 21 converts the collected light emitting current signal of each organic light emitting diode into a data voltage signal. In the process of collecting the light emitting current signals of the organic light emitting diodes in each sub-array 1-16, time division multiplexing collection can be adopted. For example, when collecting the light emitting current signal of the organic light emitting diode in the 4 th sub-array, the paths of the organic light emitting diodes electrically connected to the other organic light emitting diodes may be turned off, and thus, the number of signal transmission lines disposed on the display panel 200 may be reduced. The signal collecting unit 21 provides the converted data voltage signal to the voltage compensating unit 22, the voltage compensating unit 22 provides the determined compensating voltage of each organic light emitting diode to the gray scale generating unit 23, and the gray scale generating unit 23 generates a voltage value corresponding to the gray scale value of the organic light emitting diode and provides the voltage value to the pixel circuit of the organic light emitting display panel.
With continued reference to fig. 3, a schematic structural diagram of yet another embodiment of the gray scale compensation circuit provided by the present application is shown.
As shown in fig. 3, the gray scale compensation circuit 300 includes a signal acquisition unit 31, a voltage compensation unit 32, and a gray scale generation unit 33. Unlike the gray scale compensation circuit 100 shown in fig. 1, the gray scale compensation circuit 300 described in this embodiment further includes a data storage unit 34 and a timing control logic unit 35. The present embodiment further describes the structures of the signal acquisition unit 31 and the voltage compensation unit 32.
In this embodiment, the data storage unit 34 is connected between the signal acquisition unit 31 and the grayscale generation unit 32. The data storage unit stores the data voltage acquired by the signal acquisition unit 31.
In this embodiment, the signal acquisition unit 31 further includes a switch module 311, a current-voltage conversion module 312, and an analog-to-digital conversion module 313. The switch module 311 includes a plurality of input terminals, an output terminal, and a control terminal, wherein the input terminals of the switch module 311 are connected to the input terminals of the signal acquisition unit 31 in a one-to-one correspondence manner, and the switch module 311 is configured to control electrical connection between each organic light emitting diode and the signal acquisition unit 31 during a light emitting current signal acquisition period, so as to realize time-sharing acquisition of light emitting current of each organic light emitting diode. Therefore, signal transmission lines on the display panel can be saved, and meanwhile, the efficiency of collecting the luminous current of each organic light emitting diode can be improved. In this embodiment, the control terminal of the switch module 311 is electrically connected to the timing control logic unit 35, and under the control of the timing control logic unit 35, the switches in the switch module 311 are respectively turned on or off, and the current of the organic light emitting diodes in each sub-array is provided to the output terminal of the switch module 311 in a time-sharing manner. Here, the switch module may include a plurality of switches, each of which is connected between one organic light emitting diode and the circuit-voltage converting module 312, and each of the switches may be a MOS transistor, a bipolar transistor, or another electronic device having a switching function, which is not limited herein. When the switch is a MOS transistor, a gate of the MOS transistor may be connected to the timing control logic unit 35.
In this embodiment, the current-voltage conversion module 312 includes an input terminal and an output terminal, and the output terminal of the switch module 311 is electrically connected to the input terminal of the current-voltage conversion module 312. The current-voltage conversion module 312 is used for converting the received light emitting current value of each organic light emitting diode into a voltage value.
As shown in fig. 4, a schematic diagram of the current-voltage conversion module 312 is shown. The current-voltage conversion module 312 includes a resistor R and an integrated operational amplifier a, wherein the integrated operational amplifier a and the resistor R form a voltage parallel negative feedback circuit, a reverse input Vi of the integrated operational amplifier a is electrically connected to an input of the current-voltage conversion module 312, the reverse input Vi is configured to receive the collected light-emitting current signal, a forward input of the integrated operational amplifier a is configured to receive a reference voltage signal Vref, the reference voltage signal is generally a reference ground potential signal, an output out of the integrated operational amplifier a is electrically connected to an output of the current-voltage conversion module 312, the integrated operational amplifier a is configured to convert the received light-emitting current signal I into a voltage signal Vout, and provide the voltage signal Vout-I R to the output out.
In this embodiment, since the voltage signal output from the current-voltage conversion module 312 is an analog voltage signal, in order to facilitate the control and transmission of the signal, the voltage signal output from the current-voltage conversion module 312 is further provided to the analog-to-digital conversion module 313, and the analog voltage signal is converted into a data voltage signal by the analog-to-digital conversion module 313, and the data voltage signal is stored in the data storage unit.
In this embodiment, the voltage compensation unit 32 further includes a difference voltage processing module 321. The input terminal of the aforementioned difference voltage processing module 321 is electrically connected to the data storage unit 34, and the output terminal of the difference voltage processing module 321 is connected to the gray scale generating unit 33. The difference voltage processing module 321 is configured to obtain a data voltage signal of each oled from the data storage unit 34, compare the data voltage signal with a target voltage value in the same gray scale in the gray scale-voltage data table, and provide the compared difference voltage as a compensation voltage to the gray scale generating unit.
Since the positions of the organic light emitting diodes on the display panel are different, the lengths of the signal transmission lines for connecting the signal collecting unit 31 and the organic light emitting diodes are different, resulting in different resistance values generated by the signal transmission lines. Therefore, the attenuation degrees of the light-emitting current signals collected from the sub-arrays on the signal transmission line are different, that is, if the organic light-emitting diodes at different positions on the display panel obtain the same gray scale brightness, the gray scale voltage values for generating the display gray scale are not necessarily the same. Therefore, in some optional implementations of this embodiment, the gray scale-voltage data table may further store the collected position information of each organic light emitting diode in the display panel, and the target voltage values of the organic light emitting diodes located at different positions under the same display gray scale. The difference voltage processing module 321 may be further configured to compare the received data voltage signal corresponding to each organic light emitting diode in the same display gray scale with a target voltage value of the corresponding organic light emitting diode, and provide the compared difference voltage to the gray scale generating unit.
The gray scale-voltage data table can reduce the influence of the length difference of each signal transmission line on the display gray scale of the organic light emitting diode by increasing and recording the acquired positions of the organic light emitting diodes in the display panel and the target voltage values of the organic light emitting diodes at different positions under the same display gray scale, thereby further improving the gray scale compensation precision of each organic light emitting diode and further improving the display effect of the display panel.
Please refer to fig. 5, which shows a schematic structural diagram of a gray scale compensation circuit according to still another embodiment of the present application.
In the gray scale compensation circuit 500 shown in fig. 5, the gray scale compensation circuit 500 includes a signal acquisition unit 51, a voltage compensation unit 52, a gray scale generation unit 53, a data storage unit 54, and a timing control logic unit 55. The signal acquisition unit 51 includes a switch module 511, a circuit-voltage conversion module 512, and an analog-to-digital conversion module 513, and the voltage compensation unit 52 includes a difference voltage processing module 521. The functions of each unit and each module in the gray scale compensation circuit shown in the above embodiments are all applicable to this embodiment, and are not described herein again. Unlike the above embodiments, the voltage compensation unit 52 shown in the present embodiment further includes a data determination module 522. An input terminal of the data determination module 522 is electrically connected to an output terminal of the data storage unit, and an output terminal of the data determination module 522 is electrically connected to an input terminal of the differential voltage processing module 521.
In this embodiment, the signal collecting unit 51 may be electrically connected to the plurality of organic light emitting diodes in each sub-array, that is, for the same sub-array, collect the light emitting current signals of the plurality of organic light emitting diodes. The light emitting current signal passes through the circuit-voltage conversion module 512 and the analog-to-digital conversion module 513, and is converted into a data voltage signal and stored in the data storage unit 54. That is, the data voltage signals of a plurality of organic light emitting diodes having the same display gray scale are stored in the data storage unit 54. The data determining module 522 may perform an average calculation on the data voltage signals of the same gray scales, and transmit the calculated average data voltage signal to the delta voltage processing module 521.
In this embodiment, the organic light emitting diodes in the same sub-array have different light emitting current values under the same display gray scale due to individual differences caused by their own structural processes, and in this embodiment, the differences can be averaged by collecting light emitting current signals of the plurality of organic light emitting diodes in the sub-array, thereby improving the precision of the gray scale voltage.
Please refer to fig. 6, which illustrates an application scenario diagram corresponding to the embodiment shown in fig. 5 provided in the present application.
In the application scenario as shown in fig. 6, the display panel 600 includes an organic light emitting diode array, which is divided into sub-arrays 1-4, and the organic light emitting diodes in each sub-array 1-4 have the same display gray scale.
In the application scenario shown in fig. 6, 4 data signal transmission lines in each sub-array are electrically connected to the switch module 611, that is, the signal acquisition unit 61 acquires the light emitting currents of four organic light emitting diodes in the same sub-array. Under the control of the timing control logic unit 65, the switches in the switch module 611 are respectively turned on or off, and the current of the organic light emitting diodes in each sub-array is provided to the output terminal of the switch module 611 in a time-sharing manner. Under the control of the switch module 611, the signal acquisition unit 61 time-divisionally acquires the light emitting current signals of the organic light emitting diodes in each sub-array, and converts the acquired light emitting current signals into data voltage signals through the circuit-voltage conversion module 612 and the analog-to-digital conversion module 613 to be stored in the data storage unit 64. The voltage compensation unit 62 includes a data determination module 622 and a difference voltage processing module 621. The data determining module 622 performs average value calculation on the data voltage signals of the organic light emitting diodes having the same display gray scale in the data storage unit 64, and provides the calculated average data voltage signals to the difference voltage processing module 621, and the difference voltage processing module 621 compares each average data voltage signal with a target voltage value at the same display gray scale in a preset gray scale-voltage compensation table, and generates a difference voltage according to the comparison result and provides the difference voltage to the gray scale generating unit 63. The gray scale generating unit 63 generates a voltage value corresponding to a gray scale value of the organic light emitting diode and supplies it to the pixel circuit of the organic light emitting display panel. In the application scenario shown in fig. 6, the compensation accuracy of the gray scale voltage can be further improved by collecting a plurality of organic light emitting diodes with the same display gray scale at different positions.
It should be noted that the number of the sub-pixel arrays arranged in each application scenario and the number of the organic light emitting diodes in each selected sub-pixel array are illustrative, and are arranged according to the needs of the application scenario.
Please refer to fig. 7, which illustrates a gray scale compensation method applied to the gray scale compensation circuit provided in the above embodiments. The gray scale compensation circuit is applied to an organic light emitting display panel, the organic light emitting display panel comprises an organic light emitting diode array, the organic light emitting diode array is divided into a plurality of sub-arrays, and the gray scale compensation method 700 comprises the following steps:
s701, responding to the organic light-emitting display panel entering a gray scale compensation mode, executing a gray scale compensation step: acquiring current signals of organic light emitting diodes in each sub array in the organic light emitting diode array; respectively converting the current signals of the organic light emitting diodes into data voltage signals; comparing the data voltage signals with target voltage values under the same gray scale in a pre-stored gray scale-voltage data table, and determining voltage difference values between the data voltage signals and the target voltage values; comparing each voltage difference value with a preset voltage difference threshold range, and detecting whether the voltage difference value exceeds the voltage difference threshold range;
s702, in response to the voltage difference value not exceeding the voltage difference threshold range, processing each voltage difference value as a feedback voltage by the gray scale generation unit, generating a voltage corresponding to the gray scale value of each organic light emitting diode, and providing the voltage to the pixel circuit of the organic light emitting display panel;
and S703, responding to the voltage difference value exceeding the voltage difference threshold range, processing each voltage difference value as a feedback voltage by the gray scale generation unit, generating a voltage corresponding to the gray scale value of each organic light emitting diode, providing the voltage to the pixel circuit of the organic light emitting display panel, and continuing to perform the step of gray scale compensation.
According to the gray scale compensation method, the gray scale compensation step is set, the voltage difference value exceeding the voltage difference threshold range is detected in the gray scale step and is provided to the gray scale generation unit to generate the voltage corresponding to the gray scale value of the organic light-emitting diode, the voltage is provided to the pixel circuit of the organic light-emitting display panel, and then the gray scale compensation step is continuously executed, so that the voltage difference values are within the voltage difference threshold range, and the detection precision of the display panel is improved.
In some optional implementation manners of this embodiment, the step of converting the current signal of each organic light emitting diode into a voltage signal respectively may further include: acquiring current signals of all the organic light-emitting diodes in a time-sharing manner; and converting the acquired current signal of the organic light emitting diode into a data voltage signal through a current-voltage conversion module.
In some optional implementation manners of this embodiment, the current-voltage conversion module includes a resistor and an integrated operational amplifier, the integrated operational amplifier includes two input terminals and an output terminal, and the resistor is connected between the output terminal of the integrated operational amplifier and one of the input terminals.
In some optional implementations of this embodiment, the method further includes: acquiring current signals of a plurality of organic light emitting diodes in the same sub-array, and converting the current signals of the plurality of organic light emitting diodes in the same sub-array into data voltage signals in one-to-one correspondence; and after weighted averaging, converting a plurality of data voltage signals corresponding to the same sub-array into a data voltage signal, comparing the data voltage signal with a target voltage value in a pre-stored gray scale-voltage data table under the same gray scale, and determining a voltage difference value between each data voltage signal and the target voltage value.
The gray scale compensation circuit applied to the organic light emitting display panel and the gray scale compensation method applied to the gray scale compensation circuit have the advantages that the light emitting current signals of the organic light emitting diodes are collected, the light emitting current signals of the organic light emitting diodes are converted into voltage signals, then actual voltage difference values are compared with preset target voltage difference values, gray scale voltages of the organic light emitting diodes are compensated, voltage values corresponding to the gray scale values of the organic light emitting diodes are generated based on the compensation voltages, and the voltage values are provided for pixel circuits of the organic light emitting display panel. And performing gray scale compensation on the display panel for multiple times until the actual voltage difference value is smaller than the voltage difference threshold range, thereby improving the compensation precision of the display gray scale of the organic light-emitting diode. In addition, the embodiment provided by the application does not need to arrange a CCD sensor to detect the gray-scale value, so that the error caused by the accuracy of external equipment is reduced.
It will be appreciated by those skilled in the art that the scope of the claims referred to in this application is not limited to the particular combination of features described above, but also encompasses other embodiments in which any combination of the features described above or their equivalents is possible without departing from the spirit of the claims. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (8)
1. A gray scale compensation circuit of an organic light emitting display panel, the organic light emitting display panel comprising an organic light emitting diode array divided into a plurality of sub-arrays, the gray scale compensation circuit comprising:
the signal acquisition unit comprises a plurality of input ends, each input end is used for acquiring a light-emitting current signal of an organic light-emitting diode in one sub-array of the organic light-emitting diode array and converting the light-emitting current signal into a data voltage signal in one-to-one correspondence with the light-emitting current signal, and the display gray scales of the organic light-emitting diodes in any sub-array are the same;
the voltage compensation unit is electrically connected with the signal acquisition unit and used for comparing each data voltage signal with a target voltage value under the same gray scale in a pre-stored gray scale-voltage data table based on the data voltage signal transmitted by the signal acquisition unit and providing the compared difference voltage serving as compensation voltage to the gray scale generation unit;
the input end of the gray scale generation unit is electrically connected with the voltage compensation unit, and the gray scale generation unit is used for generating a voltage value corresponding to the gray scale value of each organic light-emitting diode based on the compensation voltage and providing the voltage value to the pixel circuit of the organic light-emitting display panel;
the gray scale compensation circuit also comprises a data storage unit, the data storage unit is connected between the signal acquisition unit and the voltage compensation unit, and the data storage unit stores the data voltage signal acquired by the signal acquisition unit;
the voltage compensation unit further comprises a difference voltage processing module; wherein the content of the first and second substances,
the input end of the differential voltage processing module is electrically connected with the data storage unit, and the output end of the differential voltage processing module is connected to the input end of the gray scale generation unit;
the difference voltage processing module is used for comparing the received data voltage signal stored by the data storage unit with a target voltage value under the same gray scale in the gray scale-voltage data table, and providing the compared difference voltage as a compensation voltage to the gray scale generation unit;
the gray scale-voltage data table also records the positions of all the organic light emitting diodes and target voltage values of the organic light emitting diodes at different positions under the same display gray scale;
the difference voltage processing module is further configured to compare the received multiple data voltage signals with target voltage values of the organic light emitting diodes corresponding to the data voltage signals at the same display gray scale, and provide the compared difference voltage to the gray scale generating unit.
2. The gray scale compensation circuit of claim 1, further comprising a timing control logic unit, wherein the signal acquisition unit further comprises a switch module, a current-voltage conversion module, and an analog-to-digital conversion module; wherein:
the input ends of the switch modules are connected with the input ends of the data acquisition units in a one-to-one correspondence manner, the output ends of the switch modules are electrically connected with the input ends of the current-voltage conversion modules, the control ends of the switch modules are electrically connected with the sequential control logic unit, and the switch modules supply the current of the organic light emitting diodes in each sub-array to the output ends of the switch modules in a time-sharing manner under the control of the sequential control logic unit;
the output end of the current-voltage conversion module is electrically connected with the analog-to-digital conversion module, and the output end of the analog-to-digital conversion module is electrically connected with the data storage unit;
the current-voltage conversion module converts the received current signal transmitted by the switch module into a voltage signal, converts the voltage signal into the data voltage signal after being converted by the analog-to-digital conversion module, and stores the data voltage signal in the data storage unit.
3. The gray scale compensation circuit of claim 2, wherein the current-to-voltage conversion module comprises a resistor and an integrated operational amplifier, the integrated operational amplifier comprises two input terminals and an output terminal, and the resistor is connected between one of the input terminals and the output terminal of the integrated operational amplifier.
4. The gray scale compensation circuit of claim 1, wherein the input terminal of the signal acquisition unit is electrically connected to the plurality of organic light emitting diodes in each of the sub-arrays, the gray scale compensation circuit further comprising a data determination module;
the data determining module is connected between the data storage unit and the difference voltage processing module, and is used for calculating an average value of data voltage signals of a plurality of organic light emitting diodes corresponding to the same sub-array stored in the data storage unit and transmitting the calculated data voltage signals to the difference voltage processing module.
5. A gray scale compensation method applied to the gray scale compensation circuit of claim 1, which is applied to an organic light emitting display panel comprising an organic light emitting diode array divided into a plurality of sub-arrays, the method comprising:
responding to the organic light-emitting display panel entering a gray scale compensation mode, and executing a gray scale compensation step: acquiring current signals of organic light emitting diodes in each sub array in the organic light emitting diode array; respectively converting the current signal of each organic light emitting diode into a data voltage signal; comparing the data voltage signals with target voltage values at the same gray scale in a pre-stored gray scale-voltage data table, and determining difference voltage between each data voltage signal and the target voltage value; comparing each difference voltage with a preset voltage difference threshold range, and detecting whether the difference voltage exceeds the voltage difference threshold range;
responding to the difference voltage not exceeding the voltage difference threshold range, processing each difference voltage as a feedback voltage by a gray scale generation unit, generating a voltage corresponding to a gray scale value of each organic light emitting diode, and providing the voltage to a pixel circuit of the organic light emitting display panel;
and responding to the difference voltage exceeding the voltage difference threshold range, processing each difference voltage as a feedback voltage by a gray scale generation unit, generating a voltage corresponding to the gray scale value of each organic light emitting diode, providing the voltage to a pixel circuit of the organic light emitting display panel, and then continuing to perform the gray scale compensation.
6. The gray scale compensation method of claim 5, wherein converting the current signal of each OLED into a data voltage signal comprises:
acquiring current signals of the organic light emitting diodes in a time-sharing manner;
and converting the acquired current signal of the organic light emitting diode into a data voltage signal through a current-voltage conversion module.
7. The gray scale compensation method of claim 6, wherein the current-to-voltage conversion module comprises a resistor and an integrated operational amplifier, the integrated operational amplifier comprises two input terminals and an output terminal, and the resistor is connected between one of the input terminals and the output terminal of the integrated operational amplifier.
8. The gray scale compensation method of claim 7, further comprising:
acquiring current signals of a plurality of organic light emitting diodes in the same sub-array, and converting the current signals of the plurality of organic light emitting diodes in the same sub-array into data voltage signals in one-to-one correspondence;
and after weighted averaging, converting a plurality of data voltage signals corresponding to the same sub-array into a data voltage signal, comparing the data voltage signal with a target voltage value in a pre-stored gray scale-voltage data table under the same gray scale, and determining the difference voltage between each data voltage signal and the target voltage value.
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| CN108877678A (en) * | 2018-09-10 | 2018-11-23 | 深圳创维－Rgb电子有限公司 | Image display method, device, display equipment and medium based on pixel compensation |
| CN109119022A (en) * | 2018-09-12 | 2019-01-01 | 武汉天马微电子有限公司 | The luminance compensation unit and method of OLED pixel, display panel and device |
| CN110060618A (en) * | 2019-04-02 | 2019-07-26 | 北海惠科光电技术有限公司 | The voltage adjusting method and display device of display panel |
| CN110570804B (en) * | 2019-09-12 | 2023-04-28 | 成都辰显光电有限公司 | Driving device and driving method of display panel and display device |
| CN110728953B (en) * | 2019-11-27 | 2021-11-05 | 京东方科技集团股份有限公司 | Gray scale voltage correction method, driving method, correction system and storage medium |
| CN112133257B (en) * | 2020-09-27 | 2022-06-03 | 合肥京东方显示技术有限公司 | Compensation method and device of display panel |
| CN112763784B (en) * | 2020-12-20 | 2022-05-20 | 复旦大学 | Current detection device and method |
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