CN110992894B - Display compensation circuit, method, display panel and display device - Google Patents
Display compensation circuit, method, display panel and display device Download PDFInfo
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- CN110992894B CN110992894B CN201911260563.3A CN201911260563A CN110992894B CN 110992894 B CN110992894 B CN 110992894B CN 201911260563 A CN201911260563 A CN 201911260563A CN 110992894 B CN110992894 B CN 110992894B
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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
- G09G3/3233—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 current through the light-emitting element
Abstract
The application provides a display compensation circuit, a display compensation method, a display panel and a display device, and relates to the technical field of display. The display compensation circuit is applied to a display panel, a feedback pixel and a display pixel are arranged in the display panel, the feedback pixel comprises a pixel driving circuit and a voltage dividing resistor, the display pixel comprises a pixel driving circuit and a light emitting element, and a signal acquisition point is arranged between the pixel driving circuit of the feedback pixel and the voltage dividing resistor; the display compensation circuit comprises a comparison module and a signal output module, wherein the comparison module is connected with the signal acquisition point and the signal output module and is used for acquiring the voltage of the signal acquisition point, comparing the voltage of the signal acquisition point with a preset reference voltage and outputting a voltage adjustment signal to the signal output module according to a comparison result; the signal output module is used for adjusting working signals which are output to display pixels of the display panel and used for driving the display pixels to work according to the voltage adjusting signals. The technical scheme of the application can improve the display effect of the display panel.
Description
Technical Field
The present application belongs to the field of display technologies, and in particular, to a display compensation circuit, a display compensation method, a display panel, and a display device.
Background
With the continuous development and improvement of display technology, at present, the application of Organic Light Emitting Diode (OLED) display panels is becoming more and more widespread.
In the process of displaying by the OLED display panel, it is found that the display panel displays a brightness different from a brightness expected by the display panel design under the current condition, and the display effect of the display panel is reduced.
Disclosure of Invention
The embodiment of the application provides a display compensation circuit, a display compensation method, a display panel and a display device, and the display effect of the display panel can be improved.
In a first aspect, an embodiment of the present application provides a display compensation circuit, which is applied to a display panel, where a feedback pixel and a display pixel are arranged in the display panel, the feedback pixel includes a pixel driving circuit and a voltage dividing resistor, the display pixel includes a pixel driving circuit and a light emitting element, and a signal acquisition point is arranged between the pixel driving circuit of the feedback pixel and the voltage dividing resistor;
the display compensation circuit comprises a comparison module and a signal output module, wherein the comparison module is connected with the signal acquisition point and the signal output module;
the comparison module is used for acquiring the voltage of the signal acquisition point, comparing the voltage of the signal acquisition point with a preset reference voltage, and outputting a voltage adjustment signal to the signal output module according to a comparison result;
the signal output module is used for adjusting working signals output to display pixels of the display panel according to the voltage adjusting signals, and the working signals are used for driving the display pixels to work.
In a second aspect, an embodiment of the present application provides a display compensation method, which is applied to the display compensation circuit in the technical solution of the first aspect, and the display compensation method includes:
acquiring the voltage of a signal acquisition point, and comparing the voltage of the signal acquisition point with a preset reference voltage to obtain a comparison result;
and adjusting working signals output to display pixels of the display panel according to the comparison result, wherein the working signals are used for driving the display pixels to work.
In a third aspect, an embodiment of the present application provides a display panel, where the display panel is provided with a feedback pixel and a display pixel, the feedback pixel includes a pixel driving circuit and a voltage dividing resistor, the display pixel includes a pixel driving circuit and a light emitting element, a signal collecting point is provided between the pixel driving circuit of the feedback pixel and the voltage dividing resistor,
the display panel further comprises the display compensation circuit in the technical scheme of the first aspect.
In a fourth aspect, an embodiment of the present application provides a display device, including the display panel in the technical solution of the third aspect.
The embodiment of the application provides a display compensation circuit, a display compensation method, a display panel and a display device, wherein a comparison module in the display compensation circuit can acquire the voltage of a signal acquisition point in a feedback pixel of the display panel, compare the voltage of the signal acquisition point with a preset reference voltage, and output a voltage adjustment signal to a signal output module in the display compensation circuit according to a comparison result. The working signal output by the signal output module is a signal for driving the display pixel to work. The signal output module adjusts the output working signal according to the voltage adjusting signal to realize the adjustment of the pixel current of the display pixels in the display panel, and alleviate or even solve the problems of overhigh and overlow brightness of the display pixels of the display panel, thereby improving the display effect of the display panel.
Drawings
The present invention will be better understood from the following description of specific embodiments thereof taken in conjunction with the accompanying drawings, in which like or similar reference characters designate like or similar features.
Fig. 1 is a circuit diagram of a feedback pixel according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram illustrating a position of a feedback pixel on a display panel according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram illustrating a position of another feedback pixel on a display panel according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram illustrating a position of another feedback pixel on a display panel according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram illustrating a position of another feedback pixel on a display panel according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of a display compensation circuit according to an embodiment of the present invention;
FIG. 7 is a schematic diagram illustrating an implementation manner of a display compensation circuit according to an embodiment of the present disclosure;
FIG. 8 is a schematic diagram illustrating another implementation manner of a display compensation circuit according to an embodiment of the present disclosure;
FIG. 9 is a schematic diagram illustrating a structure of another implementation manner of a display compensation circuit according to an embodiment of the present application;
FIG. 10 is a flowchart illustrating a display compensation method according to an embodiment of the present application;
fig. 11 is a schematic top view of a display device according to an embodiment of the present disclosure.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is in no way limited to any specific configuration and algorithm set forth below, but rather covers any modification, replacement or improvement of elements, components or algorithms without departing from the spirit of the invention. In the drawings and the following description, well-known structures and techniques are not shown in order to avoid unnecessarily obscuring the present invention.
In the display process of the display panel, due to the characteristics of various devices in the display panel, such as the attenuation of the functions of Thin Film Transistors (TFTs) in the display panel, the brightness of the display panel is attenuated. In some cases, the display panel may be rapidly attenuated in the initial stage of lighting, and the brightness may be attenuated by even 4% to 5%. However, by detecting the TFT characteristics, it is difficult to distinguish whether or not the TFT or the light emitting element is attenuated at the initial lighting stage from the characteristic curve of the TFT, and therefore, a corresponding compensation measure cannot be taken. Or the voltage drops generated by the working power lines in the display panel are different, so that the pixel currents in the display panel are different under the same gray scale condition, and the pixel brightness is different. All of the above conditions may adversely affect the display effect of the display panel. Therefore, a technique for compensating the display of the display panel is needed.
The embodiment of the application provides a display compensation circuit, a display compensation method, a display panel and a display device, which can compensate pixel current under the condition that the luminous brightness of a display pixel is higher or lower than the standard brightness of the current gray scale, so that the luminous brightness of the display pixel tends to the standard brightness of the current gray scale, and the display effect of the display device is improved. The display panel in the embodiment of the present application may be specifically an Organic Light Emitting Diode (OLED) display panel.
The display panel in the embodiment of the application is provided with a feedback pixel and a display pixel. The feedback pixel is a dummy pixel, and comprises a pixel driving circuit and a voltage dividing resistor. Display pixels in the display panel may emit light and include a pixel driving circuit and a light emitting element. Unlike the display pixels, the feedback pixels cannot emit light. The feedback pixel is different from the display pixel in that a voltage-dividing resistor is provided in the feedback pixel at a position corresponding to the position of the light-emitting element in the display pixel. For example, a pixel driving circuit in a feedback pixel is a 7T1C circuit (i.e., a circuit mainly including 7 switching tubes "T" and 1 capacitor "C"), and fig. 1 is a circuit schematic diagram of a feedback pixel provided in an embodiment of the present application. As shown in fig. 1, the feedback pixel includes switching tubes Ta1 to Ta7, a capacitor Ca, and a voltage dividing resistor R. The pixel driving circuit in the feedback pixel includes switching tubes Ta1 to Ta7, and a capacitor Ca.
As shown in fig. 1, a signal collecting point N is disposed between the pixel driving circuit and the voltage dividing resistor R in the feedback pixel, and the display compensation circuit in the embodiment of the present application is connected to the signal collecting point N through a switching tube Ta7, that is, an output control switching tube, so that the display compensation circuit can obtain a voltage of the signal collecting point. The current flowing through the voltage-dividing resistor in the feedback pixel is consistent with the pixel current, so that the display compensation circuit can judge whether the pixel current is higher than the standard of the current gray scale or lower than the standard of the current gray scale according to the voltage of the signal acquisition point.
In fig. 1, PVDD is a voltage terminal for providing an operating voltage signal. Vref is a voltage terminal that provides a reference voltage. Data1 is the signal terminal that provides the reference Data signal. The signal terminal Data1 to which the feedback pixel is connected is a signal terminal that is separately set up, and is different from the signal terminal of the Data signal corresponding to the display pixel in the display panel. The reference data signal is a signal which can enable the voltage of the signal acquisition point N to be the same as the preset reference voltage under the current gray scale under the condition that the switching tube is not attenuated. Assuming that the feedback pixels and the nth row of display pixels in the display panel are arranged in the same row, Scan [ n-1] is a signal end for providing a scanning signal for the nth row of display pixels, Scan [ n ] is a signal end for providing a scanning signal for the nth row of display pixels, Scan [ x ] is a signal end for providing a scanning signal for the xth row of display pixels, and the value of x is not limited herein. E [ n ] is a signal terminal for supplying a light emission control signal to the display pixels of the nth row.
The display panel provided by the embodiment of the application comprises a display compensation circuit, and the electrical connection relationship between the display compensation circuit and the feedback pixel is shown in fig. 1. The number of feedback pixels disposed on the display panel is at least one. That is, one feedback pixel may be provided on the display panel, or two or more feedback pixels may be provided. The setting of the feedback pixels does not influence the display effect of the display panel as much as possible or has little influence on the display effect of the display panel.
In some examples, the feedback pixels may be located in a display region of the display panel and disposed adjacent to a non-display region of the display panel. For example, the feedback pixels are disposed above the first row of display pixels and/or below the last row of display pixels in the display area, and the feedback pixels are arranged in rows. For example, fig. 2 is a schematic diagram illustrating a position of a feedback pixel on a display panel according to an embodiment of the present disclosure. As shown in fig. 2, the display area AA is provided with two rows of feedback pixels, the feedback pixels being indicated by hatched blocks, and the display pixels having light emitting elements. A row of feedback pixels is located above the first row of display pixels in the display area AA, adjacent to the non-display area NA. The other row of feedback pixels is located below the last row of display pixels in the display area AA and adjacent to the non-display area NA. The feedback pixels are arranged adjacent to the non-display area, so that the influence on the display effect can be reduced. Moreover, most signal ends required to be connected by the feedback pixels are the same as those connected by the display pixels, and the feedback pixels are arranged adjacent to the non-display area, so that wiring difficulty can be reduced, wiring is facilitated, and a wiring structure is simplified.
For another example, the feedback pixels may be arranged by display pixel spacing of the display area. Specifically, the feedback pixels are arranged by the display pixel interval at the edge of the display area. For example, fig. 3 is a schematic diagram of a position of another feedback pixel on a display panel according to an embodiment of the present disclosure. As shown in fig. 3, the display area AA is provided with a feedback pixel, which is indicated by a hatched block, and a display pixel having a light emitting element. The display area AA is a rectangular area, and the feedback pixel may be disposed at a vertex of the rectangular display area AA and adjacent to the non-display area NA. For another example, fig. 4 is a schematic diagram illustrating a position of another feedback pixel on a display panel according to an embodiment of the present application. As shown in fig. 4, the display area is provided with four feedback pixels, the feedback pixels being indicated by hatched blocks, and the display pixels having light emitting elements. The four feedback pixels are respectively positioned at four top corners of the rectangular display area AA and adjacent to the non-display area NA. The feedback pixels are arranged at intervals through the display pixels, the number of the arranged feedback pixels is reduced, and therefore the influence of the feedback pixels on the display effect is further reduced.
In other examples, the feedback pixels may be located in a non-display region of the display panel, adjacent to a display region of the display panel. For example, the feedback pixels are arranged in at least one column on at least one side of the display pixels in the display area, and each feedback pixel is arranged in the same row as one row of the display pixels in the display area. For example, fig. 5 is a schematic diagram illustrating a position of another feedback pixel on a display panel according to an embodiment of the present disclosure. As shown in fig. 5, the non-display area NA is provided with two columns of feedback pixels adjacent to the display area AA. The feedback pixels are indicated by hatched blocks, and the display pixels have light emitting elements. Each feedback pixel is arranged in the same row as a row of display pixels in the display area AA. Each feedback pixel in the same column of the non-display area NA may connect the lead of the feedback pixel signal acquisition point N to the same feedback line connected to the display compensation circuit in the embodiment of the present application. Most signal ends required to be connected by the feedback pixels are the same as the signal ends connected by the display pixels, and the feedback pixels are arranged adjacent to the display area, so that the wiring difficulty can be reduced, the wiring is convenient, and the wiring structure is simplified.
Moreover, in the embodiment of the application, the number of the feedback pixels is far less than that of the display pixels, the display compensation can be performed based on the voltage of the signal acquisition point in the feedback pixels which account for a small number in the display panel, each display pixel does not need to be monitored independently, the structure of the display panel is simplified, and the complexity of the display compensation is reduced.
In order to further improve the stability of the voltage provided by the signal acquisition point. An output control switch tube, such as the switch tube Ta7 in fig. 1, is arranged between the signal acquisition point N of the feedback pixel arranged in the same row as the nth row of display pixels in the display area and the display compensation circuit. The control end of the output control switch tube can receive the scanning signal of the display pixels in the n-m th row in the display area or the scanning signal of the display pixels in the n + m th row in the display area, that is, x ═ n-m or x ═ n + m in the signal end Scan [ x ] in fig. 1. If the control end of the output control switch tube receives the scanning signal of the display pixels of the (N-m) th row in the display area, the data control switch tube is started along with the scanning of the display pixels of the (N-m) th row in the previous frame of image to provide the voltage of the signal acquisition point N for the display compensation circuit so as to ensure the stability of the voltage of the signal acquisition point N. If the control end of the output control switch tube receives the scanning signal of the display pixels of the (N + m) th row in the display area, the output control switch tube is started when the display pixels of the (N + m) th row in the current frame image are scanned, and the voltage of the signal acquisition point N is provided for the display compensation circuit, so that the stability of the voltage of the signal acquisition point N is ensured. The stability of the voltage of the signal acquisition point N can further improve the accuracy of display compensation.
The display compensation circuit provided in the embodiments of the present application will be specifically described below. Fig. 6 is a schematic structural diagram of a display compensation circuit according to an embodiment of the disclosure. As shown in fig. 6, the display compensation circuit P10 includes a comparison module P11 and a signal output module P12. The comparison module P11 is connected with the signal acquisition point N and the signal output module P12. Specifically, the input terminal of the comparison module P11 is connected to the signal acquisition point N, and the output terminal of the comparison module P11 is connected to the input terminal of the signal output module P12.
The comparison module P11 is configured to obtain a voltage of the signal acquisition point, compare the voltage of the signal acquisition point with a preset reference voltage, and output a voltage adjustment signal to the signal output module P12 according to a comparison result.
The preset reference voltage may be a reference standard voltage corresponding to the current gray scale, and the reference standard voltage is a standard voltage without the influence of aging, drifting and the like on the switching tube in the feedback pixel. For example, when the current pixel displays the gray level 127, the predetermined reference voltage may be a reference standard voltage corresponding to the gray level 127.
The comparison result comprises that the voltage of the signal acquisition point is higher than the preset reference voltage or the voltage of the signal acquisition point is lower than the preset reference voltage. The comparison result comprises that the voltage of the signal acquisition point is higher than the preset reference voltage, namely, the current flowing through the voltage division resistor is higher than the current corresponding to the preset reference voltage. Since the change in the current flowing through the voltage-dividing resistor coincides with the change in the pixel current of the real pixel, the pixel current of the real pixel is also high, and the luminance of the display pixel is high, which needs to be compensated. The comparison result comprises that the voltage of the signal acquisition point is lower than the preset reference voltage, namely the current flowing through the voltage division resistor is lower than the current corresponding to the preset reference voltage. Since the change of the current flowing through the voltage-dividing resistor coincides with the change of the pixel current of the real pixel, the pixel current of the real pixel is low, the luminance of the display pixel is low, and compensation is required. The comparison result comprises that the voltage of the signal acquisition point is equal to the preset reference voltage, which indicates that the pixel current does not need to be adjusted and does not need to be compensated. The different comparison results correspond to different voltage adjustment signals, and the voltage adjustment signals represent the comparison results and can instruct the signal output module P12 to adjust the working signals output to the display pixels of the display panel according to the comparison results.
The signal output module P12 is used for adjusting the working signal output to the display pixels of the display panel according to the voltage adjustment signal.
The OUTPUT terminal OUTPUT of the signal OUTPUT module P12 OUTPUTs a working signal to the display pixels of the display panel. The working signal is used for driving the display pixel to work. In particular, the operating signal may include an operating voltage signal and/or a data signal. The operating voltage signal provides the operating voltage PVDD for the display pixels. All the display pixels in the display panel can share one working voltage signal. The Data signal is a signal for displaying the display content of the pixel.
In some examples, in the case that the operation signal includes an operation voltage signal, if the comparison result includes that the voltage of the signal acquisition point is higher than the preset reference voltage, the signal output module P12 decreases the voltage of the output operation voltage signal to decrease the pixel current of the display pixel; if the comparison result includes that the voltage of the signal acquisition point is lower than the preset reference voltage, the signal output module P12 increases the voltage of the output working voltage signal to increase the pixel current of the display pixel. The display pixels in the display panel share the same working voltage signal, the mode of adjusting the voltage of the working voltage signal is simpler and easier, and the display compensation is easier to realize.
In other examples, the operating signals include data signals, and the pixel currents of the display pixels decrease as the voltages of the data signals increase. Under the condition that the working signal comprises a data signal, if the comparison result comprises that the voltage of the signal acquisition point is higher than the preset reference voltage, the signal output module P12 raises the voltage of the output data signal so as to reduce the pixel current of the display pixel; if the comparison result includes that the voltage of the signal acquisition point is lower than the preset reference voltage, the signal output module P12 decreases the voltage of the output data signal to increase the pixel current of the display pixel. According to the difference of the display content of the display panel, the data signals can be different, and different degrees of display compensation can be performed aiming at different data signals, so that the accuracy of the display compensation is further improved.
In the embodiment of the present application, the comparing module P11 in the display compensation circuit P10 may obtain the voltage of the signal acquisition point disposed in the feedback pixel of the display panel, compare the voltage of the signal acquisition point with a preset reference voltage, and output a voltage adjustment signal to the signal output module P12 in the display compensation circuit P10 according to the comparison result. The operation signal output by the signal output module P12 is a signal for driving the display pixel to operate. The signal output module P12 adjusts the output working signal according to the voltage adjustment signal to adjust the pixel current of the display pixels in the display panel, and alleviate or even solve the problem that the luminance of the display pixels of the display panel is too high or too low, thereby improving the display effect of the display panel.
Moreover, in the embodiment of the present application, the voltage of the signal acquisition point and the current flowing through the voltage-dividing resistor in the feedback pixel have a positive correlation, and the change of the current flowing through the voltage-dividing resistor in the feedback pixel is consistent with the change of the pixel current in the real pixel. Therefore, no matter the pixel brightness of the real pixel is affected by one or more of function attenuation of the switching tube, electric parameter drift of the switching tube, voltage drop of a working voltage signal line, namely a working power line, or other factors, the pixel brightness can be reflected by the voltage of the signal acquisition point.
The specific structures of the comparison module and the signal output module in the above embodiments will be exemplified below.
In some embodiments, the operating signal comprises an operating voltage signal for the display pixel. Fig. 7 is a schematic structural diagram of an implementation manner of a display compensation circuit in an embodiment of the present application. The display compensation circuit can be realized by a Power unit in the display panel, such as a Power integrated circuit (Power IC), and specifically can be a charge pump circuit consisting of a switch tube, a capacitor and an inductor. As shown in fig. 7, the comparing module P11 may include a comparator M1, and the signal output module P12 may include a first pulse signal generator P121, a first switching tube T1, a second switching tube T2, a first capacitor C1, and a first inductor C2.
A first input terminal of the comparator M1 is connected to a reference voltage terminal VREF for providing a predetermined reference voltage. A second input of the comparator M1 is connected to the signal acquisition point. The output end of the comparator M1 is connected with the signal output module P12. An input terminal of the first pulse signal generator P121 is connected to an output terminal of the comparator M1. The output end of the first pulse signal generator P121 is connected to the control end of the first switch transistor T1 and the control end of the second switch transistor T2. The first terminal of the first switch transistor T1 is connected to the first terminal of the second switch transistor T2 and one terminal of the first inductor L1. The second terminal of the first switch transistor T1 is connected to one terminal of the first capacitor C1 and the OUTPUT terminal OUTPUT of the signal OUTPUT module P12. A first terminal of the second switch transistor T2 is connected to one terminal of the first inductor C1. A second end of the second switching tube T2 is connected to ground. The other end of the first inductor L1 is connected to a first voltage input terminal V1 that provides an input voltage. The other end of the first capacitor V1 is electrically connected to the ground signal terminal.
The first switch transistor T1 may be an N-type switch transistor, and the second switch transistor T2 may be a P-type switch transistor.
The first Pulse signal generator P121 is configured to generate and output a Pulse signal, and specifically, may generate a Pulse Width Modulation (PWM) signal to control the first switch transistor T1 to be turned on and off. The first pulse signal generator P121 adjusts a pulse parameter of the output pulse signal according to the voltage adjustment signal. The pulse parameters may determine the waveform of the pulse signal. For example, the pulse parameters include frequency and/or amplitude. In the case where the pulse parameter includes a frequency, the frequency of the pulse signal generated and output by the first pulse signal generator P121 increases as the voltage of the voltage adjustment signal increases. In the case where the pulse parameter includes an amplitude, the amplitude of the pulse signal generated and output by the first pulse signal generator P121 increases as the voltage of the voltage adjustment signal decreases.
The voltage adjustment signal may include a first voltage adjustment signal or a second voltage adjustment signal. If the comparison result includes that the voltage at the signal acquisition point is higher than the preset reference voltage, the comparator M1 outputs a first voltage adjustment signal. The first voltage adjustment signal may be a low level signal. On the one hand, the first pulse signal generator P121 decreases the frequency of the output pulse signal according to the low level signal. The smaller the frequency of the pulse signal is, the lower the voltage of the working voltage signal OUTPUT by the OUTPUT terminal OUTPUT of the signal OUTPUT module P12 is, so that the pixel current of the display pixel in the display panel can be reduced, and the display compensation can be realized. On the other hand, the first pulse signal generator P121 increases the amplitude of the OUTPUT pulse signal according to the low level signal, reduces the inductance of the signal OUTPUT module P12 and increases the on-resistance of the second switching tube T2, thereby increasing the time constant of the inductance network of the signal OUTPUT module P12, reducing the charging efficiency, and reducing the voltage of the working voltage signal OUTPUT by the OUTPUT terminal OUTPUT of the signal OUTPUT module P12, so as to reduce the pixel current of the display pixels in the display panel, and further implement the display compensation.
The comparison result comprises that the voltage of the signal acquisition point is lower than the preset reference voltage, and the comparator M1 outputs a second voltage adjustment signal. The second voltage adjustment signal may be a high level signal. On the other hand, the first pulse signal generator P121 increases the frequency of the output pulse signal according to the high level signal. The higher the frequency of the pulse signal is, the higher the voltage of the working voltage signal OUTPUT by the OUTPUT terminal OUTPUT of the signal OUTPUT module P12 is, so that the pixel current of the display pixels in the display panel can be increased, and the display compensation can be further realized. On the other hand, according to the high level signal, the first pulse signal generator P121 decreases the amplitude of the OUTPUT pulse signal, increases the inductance of the signal OUTPUT module P12, decreases the on-resistance of the second switching tube T2, decreases the time constant of the inductance network of the signal OUTPUT module P12, improves the charging efficiency, and increases the voltage of the working voltage signal OUTPUT by the OUTPUT terminal OUTPUT of the signal OUTPUT module P12, so that the pixel current of the display pixels in the display panel can be increased, thereby implementing the display compensation.
In other embodiments, the operating signal comprises an operating voltage signal for the display pixel. Fig. 8 is a schematic structural diagram of another implementation manner of a display compensation circuit in an embodiment of the present application. The display compensation circuit can be realized by a Power unit in the display panel, such as a Power integrated circuit (Power IC), and specifically can be a charge pump circuit consisting of a switch tube, a capacitor and an inductor. As shown in FIG. 8, the comparison module P11 may include a comparator M2. The signal output module P12 includes a second pulse signal generator P122, a third switching tube T3, a fourth switching tube T4, a fifth switching tube T5, a second capacitor C2 and a second inductor L2.
A first input terminal of the comparator M2 is connected to a reference voltage terminal VREF for providing a predetermined reference voltage. A second input of the comparator M2 is connected to the signal acquisition point. The output end of the comparator M2 is connected with the signal output module P12. The control terminal of the third switch transistor T3 is connected to the output terminal of the comparator M2. The first terminal of the third switching tube T3 is connected to the first terminal of the fourth switching tube T4. A second terminal of the third switch transistor T3 is connected to one terminal of the second capacitor C2 and the output terminal of the signal output module P12. The output end of the second pulse signal generator P122 is connected to the control end of the fourth switching tube T4 and the control end of the fifth switching tube T5. The second terminal of the fourth switching transistor T4 is connected to the first terminal of the fifth switching transistor T5 and one terminal of the second inductor L2. A first terminal of the fifth switch transistor T5 is connected to one terminal of the second inductor C2, and a second terminal of the fifth switch transistor T5 is connected to ground. The other end of the second inductor L2 is connected to a first voltage input terminal V1 that provides an input voltage. The other end of the second capacitor C2 is electrically connected to the ground signal terminal.
The third switch tube is an N-type switch tube. The fourth switch tube is an N-type switch tube. The fifth switch tube is a P-type switch tube.
The second pulse signal generator P122 is configured to generate and output a pulse signal, and in particular, may generate a PWM signal to control the fourth switching tube T4 to be turned on and off.
The voltage adjustment signal may include a first voltage adjustment signal or a second voltage adjustment signal. If the comparison result includes that the voltage at the signal acquisition point is higher than the preset reference voltage, the comparator M2 outputs a first voltage adjustment signal. The first voltage adjustment signal may be a low level signal. The third switching tube T3 is turned off or turned on to a low degree, which reduces the voltage of the working voltage signal OUTPUT by the OUTPUT terminal OUTPUT of the signal OUTPUT module P12, thereby reducing the pixel current of the display pixels in the display panel, and further realizing the display compensation.
If the comparison result includes that the voltage of the signal acquisition point is lower than the preset reference voltage, the comparator M2 outputs a second voltage adjustment signal. The second voltage adjustment signal may be a high level signal. The third switching tube T3 is turned on and has a higher conduction degree, and the voltage of the working voltage signal OUTPUT by the OUTPUT terminal OUTPUT of the signal OUTPUT module P12 is increased, so that the pixel current of the display pixels in the display panel is increased, and the display compensation is realized.
In the above two embodiments, the operating signal includes the operating voltage signal of the display pixel, and when all the display pixels in the display panel share the operating voltage signal, the display compensation can be realized by providing as few feedback pixels as possible on the display panel. The display panel has simple results, and has little display influence on the display panel and can be ignored.
In still other examples, the operating signals include data signals for display pixels. Fig. 9 is a schematic structural diagram of another implementation manner of a display compensation circuit in an embodiment of the present application. The display compensation circuit can be implemented by a driving unit in the display panel, such as a driving integrated circuit (Driver IC). As shown in FIG. 9, the comparison module P11 may include a comparator M3. The signal output module P12 may include a second voltage terminal V2, a third voltage terminal V3, a voltage dividing resistor network P123, a switch matrix P124, and a regulating unit P125.
The voltage dividing resistor network P123 is connected to the second voltage terminal V2, the third voltage terminal V3, and the switch matrix P124, and is located between the second voltage terminal V2 and the third voltage terminal V3. The switch matrix P124 is connected to the OUTPUT terminal OUTPUT of the signal OUTPUT module P12. The regulating unit P125 is connected to the output of the comparator M3.
The second voltage terminal V2 is used to provide a high input voltage to the voltage divider resistor network P123. The third voltage terminal V3 is used to provide a low input voltage to the voltage divider resistor network P123. The voltage dividing resistor network P123 may input the voltage of the data signal of each display pixel in the display panel according to the high input voltage provided by the second voltage terminal V2 and the low input voltage provided by the third voltage terminal. I.e. a high input voltage and a low input voltage may control the voltage of the data signal of the display pixel.
The adjusting unit P125 is used for adjusting the low input voltage provided by the third voltage terminal V3 according to the voltage adjusting signal. For example, the voltage adjustment signal may include a first voltage adjustment signal or a second voltage adjustment signal. If the comparison result includes that the voltage at the signal acquisition point is higher than the preset reference voltage, the comparator M3 outputs a first voltage adjustment signal. The adjusting unit P125 increases the low input voltage provided from the third voltage terminal V3 according to the first voltage adjustment signal to increase the voltage of the data signal and reduce the pixel current of the display pixel, thereby implementing the display compensation. If the comparison result includes that the voltage of the signal acquisition point is lower than the preset reference voltage, the comparator M3 outputs a second voltage adjustment signal. The adjusting unit P125 reduces the low input voltage provided from the third voltage terminal V3 according to the second voltage adjustment signal to reduce the voltage of the data signal and increase the pixel current of the display pixel, thereby implementing the display compensation.
Alternatively, the adjusting unit P125 is used for adjusting the high input voltage provided by the second voltage terminal V2 and the low input voltage provided by the third voltage terminal V3 according to the voltage adjusting signal. For example, the voltage adjustment signal may include a first voltage adjustment signal or a second voltage adjustment signal. If the comparison result includes that the voltage at the signal acquisition point is higher than the preset reference voltage, the comparator M3 outputs a first voltage adjustment signal. The adjusting unit P125 boosts the high input voltage provided from the second voltage terminal V2 and the low input voltage provided from the third voltage terminal V3 according to the first voltage adjusting signal to boost the voltage of the data signal, and reduces the pixel current of the display pixel, thereby implementing display compensation. If the comparison result includes that the voltage of the signal acquisition point is lower than the preset reference voltage, the comparator M3 outputs a second voltage adjustment signal. The adjusting unit P125 decreases the high input voltage provided from the second voltage terminal V2 and the low input voltage provided from the third voltage terminal V3 according to the second voltage adjustment signal to decrease the voltage of the data signal and increase the pixel current of the display pixel, thereby implementing display compensation.
With reference to fig. 1 and 9, the relationship between the voltage of the data signal, the voltage of the signal acquisition point, the pixel current, and the voltage of the operating voltage signal in the above embodiments is shown in equations (1) to (5):
I＝k×(VDD-VDATA)2 (1)
Vn＝I×R+VSS＝R×k×(VDD-VDATA)2+VSS (2)
wherein, VDATAIs the voltage of the data signal, I is the pixel current, VDDIs the voltage of the working voltage signal, R is the resistance value of the divider resistor, VSSIs a common voltage of a common voltage terminal, VnIs the voltage of the signal acquisition point, k is the characteristic parameter of the switching tube, V2Is the voltage of the second voltage terminal, V3Is the voltage of the third voltage terminal, a1、b1、a2And b2Is a constant parameter.
The switching tube in the above embodiments may be a Thin Film Transistor (TFT), but is not limited thereto.
Corresponding to the display compensation circuit in the above embodiment, an embodiment of the present application further provides a display compensation method, which is used for the display compensation circuit in the above embodiment. Fig. 10 is a flowchart illustrating a display compensation method according to an embodiment of the present disclosure. As shown in fig. 10, the display compensation method may include step S201 and step S202.
In step S201, a voltage of the signal acquisition point is obtained, and the voltage of the signal acquisition point is compared with a preset reference voltage to obtain a comparison result.
In step S202, the operation signal output to the display pixel of the display panel is adjusted according to the comparison result.
The working signal is used for driving the display pixel to work.
The relevant content of step S201 and step S202 can refer to the relevant description in the above embodiments, and is not repeated herein.
In the embodiment of the application, the voltage of a signal acquisition point in a feedback pixel of a display panel can be acquired, the voltage of the signal acquisition point is compared with a preset reference voltage, and a voltage adjustment signal is output to a signal output module in a display compensation circuit according to a comparison result. The operation signal is a signal for driving the display pixel to operate. And adjusting the output working signal according to the comparison result to realize the adjustment of the pixel current of the display pixels in the display panel, and relieving or even solving the problems of overhigh and overlow brightness of the display pixels of the display panel, thereby improving the display effect of the display panel.
In some examples, the operating signal may include an operating voltage signal of the display pixel. Specifically, if the comparison result indicates that the voltage of the signal acquisition point is lower than the preset reference voltage, the voltage of the output working voltage signal is increased. And if the comparison result represents that the voltage of the signal acquisition point is higher than the preset reference voltage, reducing the voltage of the output working voltage signal.
In other examples, the operating signals include data signals for display pixels. Specifically, if the voltage of the signal acquisition point represented by the comparison result is lower than the preset reference voltage, the low input voltage for generating the data signal is reduced, or the low input voltage and the high input voltage for generating the data signal are reduced to reduce the voltage of the data signal. And if the comparison result indicates that the voltage of the signal acquisition point is higher than the preset reference voltage, raising the low input voltage for generating the data signal, or raising the low input voltage and the high input voltage for generating the data signal so as to raise the voltage of the data signal.
The embodiment of the application also provides a display device. Fig. 11 is a schematic top view of a display device according to an embodiment of the present disclosure. As shown in fig. 11, the display device 200 includes the display panel in the above-described embodiment. The display panel has a display area AA and a non-display area NA. The display device may be, but is not limited to, a device with a display function, such as a mobile phone, a computer, a tablet computer, a television, and electronic paper.
It should be clear that the embodiments in this specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. For the display compensation method embodiment and the display device embodiment, the relevant points can be referred to the description part of the display panel embodiment and the display compensation circuit embodiment. The present application is not limited to the particular steps and structures described above and shown in the drawings. Those skilled in the art may make various changes, modifications and additions or change the order between the steps after appreciating the spirit of the invention. Also, a detailed description of known process techniques is omitted herein for the sake of brevity.
It will be appreciated by persons skilled in the art that the above embodiments are illustrative and not restrictive. Different features which are present in different embodiments may be combined to advantage. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art upon studying the drawings, the specification, and the claims. In the claims, the term "comprising" does not exclude other means or steps; the indefinite article "a" does not exclude a plurality; the terms "first" and "second" are used to denote a name and not to denote any particular order. Any reference signs in the claims shall not be construed as limiting the scope. The functions of the various parts appearing in the claims may be implemented by a single hardware or software module. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
Claims (18)
1. The display compensation circuit is characterized by being applied to a display panel, wherein a feedback pixel and a display pixel are arranged in the display panel, the feedback pixel comprises a pixel driving circuit and a voltage dividing resistor, the display pixel comprises the pixel driving circuit and a light emitting element, and a signal acquisition point is arranged between the pixel driving circuit of the feedback pixel and the voltage dividing resistor;
the feedback pixel does not emit light, and the position of the voltage division resistor in the feedback pixel corresponds to the position of the light emitting element in the display pixel; the display compensation circuit comprises a comparison module and a signal output module, and the comparison module is connected with the signal acquisition point and the signal output module;
the comparison module is used for acquiring the voltage of the signal acquisition point, comparing the voltage of the signal acquisition point with a preset reference voltage, and outputting a voltage adjustment signal to the signal output module according to a comparison result;
the signal output module is used for adjusting working signals output to the display pixels of the display panel according to the voltage adjusting signals, and the working signals are used for driving the display pixels to work;
the feedback pixel is connected with a signal end for providing a reference data signal, the signal end for providing the reference data signal is different from a signal end of a data signal corresponding to the display pixel, and the reference data signal is used for enabling the voltage of the signal acquisition point to be the same as the preset reference voltage under the current gray scale under the condition that a switching tube is not attenuated.
2. The display compensation circuit of claim 1, wherein the comparison module comprises:
the first input end of the comparator is connected with a reference voltage end used for providing a preset reference voltage, the second input end of the comparator is connected with the signal acquisition point, and the output end of the comparator is connected with the signal output module.
3. The display compensation circuit of claim 2, wherein the signal output module comprises a first pulse signal generator, a first switch tube, a second switch tube, a first capacitor and a first inductor, and the working signal comprises a working voltage signal of the display pixel;
the input end of the first pulse signal generator is connected with the output end of the comparator, and the output end of the first pulse signal generator is connected with the control end of the first switch tube and the control end of the second switch tube and used for adjusting pulse parameters of the output pulse signals according to the voltage adjusting signals;
the first end of the first switch tube is connected with the first end of the second switch tube and one end of the first inductor, and the second end of the first switch tube is connected with one end of the first capacitor and the output end of the signal output module;
the first end of the second switch tube is connected with one end of the first inductor, and the second end of the second switch tube is electrically connected with the grounding signal end;
the other end of the first inductor is connected with a first voltage input end for providing input voltage;
the other end of the first capacitor is electrically connected with the grounding signal end.
4. The display compensation circuit of claim 3, wherein the pulse parameters include a frequency and/or an amplitude,
wherein the frequency of the pulse signal increases as the voltage of the voltage adjustment signal increases, and the amplitude of the pulse signal increases as the voltage of the voltage adjustment signal decreases.
5. The display compensation circuit of claim 3, wherein the first switch transistor is an N-type switch transistor and the second switch transistor is a P-type switch transistor.
6. The display compensation circuit of claim 2, wherein the signal output module comprises a second pulse signal generator, a third switch tube, a fourth switch tube, a fifth switch tube, a second capacitor and a second inductor, and the working signal comprises a working voltage signal of the display pixel;
the control end of the third switching tube is connected with the output end of the comparator, the first end of the third switching tube is connected with the first end of the fourth switching tube, and the second end of the third switching tube is connected with one end of the second capacitor and the output end of the signal output module;
the output end of the second pulse signal generator is connected with the control end of the fourth switching tube and the control end of the fifth switching tube;
the second end of the fourth switching tube is connected with the first end of the fifth switching tube and one end of the second inductor;
the first end of the fifth switching tube is connected with one end of the second inductor, and the second end of the fifth switching tube is electrically connected with the grounding signal end;
the other end of the second inductor is connected with a first voltage input end for providing input voltage;
the other end of the second capacitor is electrically connected with the grounding signal terminal.
7. The display compensation circuit of claim 6, wherein the third switch tube is an N-type switch tube, the fourth switch tube is an N-type switch tube, and the fifth switch tube is a P-type switch tube.
8. The display compensation circuit of claim 1, wherein the signal output module comprises a second voltage terminal, a third voltage terminal, a voltage dividing resistor network, a switch matrix and an adjusting unit, and the working signal comprises a data signal of the display pixel;
the second voltage end is used for providing a high input voltage acting on the voltage-dividing resistor network;
the third voltage end is used for providing a low input voltage acting on the voltage-dividing resistor network;
the voltage dividing resistor network is connected with the second voltage end, the third voltage end and the switch matrix and is positioned between the second voltage end and the third voltage end;
the switch matrix is connected with the output end of the signal output module;
the adjusting unit is connected to an output end of the comparing module, and is configured to adjust the low input voltage provided by the third voltage end according to the voltage adjusting signal, or adjust the high input voltage provided by the second voltage end and the low input voltage provided by the third voltage end.
9. A display compensation method applied to the display compensation circuit according to any one of claims 1 to 8, the method comprising:
acquiring the voltage of the signal acquisition point, and comparing the voltage of the signal acquisition point with a preset reference voltage to obtain a comparison result;
and adjusting working signals output to display pixels of the display panel according to the comparison result, wherein the working signals are used for driving the display pixels to work.
10. The method of claim 9, wherein the operating signal comprises an operating voltage signal for the display pixel,
the adjusting the working signal output to the display pixel of the display panel according to the comparison result comprises:
if the comparison result represents that the voltage of the signal acquisition point is lower than the preset reference voltage, increasing the voltage of the output working voltage signal;
and if the comparison result represents that the voltage of the signal acquisition point is higher than the preset reference voltage, reducing the voltage of the output working voltage signal.
11. The method of claim 9, wherein the operating signals comprise data signals of the display pixels,
the adjusting the working signal output to the display pixel of the display panel according to the comparison result comprises:
if the comparison result represents that the voltage of the signal acquisition point is lower than the preset reference voltage, reducing a low input voltage for generating the data signal, or reducing a low input voltage and a high input voltage for generating the data signal so as to reduce the voltage of the data signal;
and if the comparison result indicates that the voltage of the signal acquisition point is higher than the preset reference voltage, raising a low input voltage for generating the data signal, or raising the low input voltage and the high input voltage for generating the data signal so as to raise the voltage of the data signal.
12. A display panel is provided with a feedback pixel and a display pixel, wherein the feedback pixel comprises a pixel driving circuit and a voltage dividing resistor, the display pixel comprises the pixel driving circuit and a light emitting element, a signal collecting point is arranged between the pixel driving circuit and the voltage dividing resistor of the feedback pixel,
the display panel further comprising a display compensation circuit according to any one of claims 1 to 8.
13. The display panel of claim 12, wherein the feedback pixels are located in a display area of the display panel and are disposed adjacent to a non-display area of the display panel.
14. The display panel of claim 13, wherein the feedback pixels are spaced apart by the display pixels of the display area.
15. The display panel of claim 12, wherein the feedback pixel is located in a non-display region of the display panel and is disposed adjacent to a display region of the display panel.
16. The display panel of claim 15, wherein the feedback pixels are arranged in at least one column on at least one side of the display area, and each of the feedback pixels is arranged in a row with one of the display pixels in the display area.
17. The display panel of claim 16, wherein an output control switch is disposed between the signal collecting point of the feedback pixel arranged in the same row as the nth row of display pixels in the display region and the display compensation circuit,
the control end of the output control switch tube is used for receiving the scanning signals of the display pixels of the n-m th row in the display area or the scanning signals of the display pixels of the n + m th row in the display area,
wherein n and m are positive integers.
18. A display device characterized by comprising the display panel according to any one of claims 12 to 17.
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| CN112216235B (en) * | 2020-09-28 | 2022-06-17 | 北京大学深圳研究生院 | Feedback signal detection method and display system |
| CN112164358B (en) * | 2020-09-28 | 2022-07-08 | 北京大学深圳研究生院 | Feedback signal detection method and pixel external analog domain compensation display system |
| CN112599078B (en) * | 2020-12-17 | 2022-03-01 | 北京大学深圳研究生院 | Pixel unit and pixel external analog domain compensation display system |
| CN112908254A (en) * | 2021-01-28 | 2021-06-04 | 上海天马有机发光显示技术有限公司 | Display panel, brightness compensation method of display panel and display device |
| CN112908248A (en) * | 2021-03-02 | 2021-06-04 | 深圳市华星光电半导体显示技术有限公司 | Pixel driving circuit and display panel |
| CN114373417A (en) * | 2022-01-17 | 2022-04-19 | 武汉华星光电半导体显示技术有限公司 | Display device and electronic apparatus |
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| JP4036184B2 (en) * | 2003-11-28 | 2008-01-23 | セイコーエプソン株式会社 | Display device and driving method of display device |
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