CN113674692B - Voltage drop compensation method and device and electronic equipment - Google Patents
Voltage drop compensation method and device and electronic equipment Download PDFInfo
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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]
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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
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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
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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]
- G09G3/3275—Details of drivers for data electrodes
- G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
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- 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
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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Abstract
The disclosure provides a voltage drop compensation method and device and an electronic device. The voltage drop compensation method is used for a display panel, the display panel comprises a plurality of pixel units, and the pixel units share a cathode film layer, and the method comprises the following steps: dividing a display area of a display panel into a plurality of display partitions, each display partition including a plurality of pixel units; calculating impedance data of the cathode film layer corresponding to each display partition; calculating current data flowing through each display partition at the loaded target display data voltage; calculating the voltage drop generated by the cathode film layer corresponding to each display subarea according to the impedance data and the current data; and compensating the display brightness of each display subarea based on the voltage drop generated by the cathode film layer corresponding to each display subarea. By adopting the technical scheme provided by the disclosure, the influence of the voltage drop generated by the cathode film layer on the brightness uniformity of the display device can be eliminated.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a voltage drop compensation method and apparatus for a display panel, and an electronic device.
Background
With the rapid development of internet technology and mobile communication technology, the world enters a brand-new 'information era', information contents become increasingly rich and colorful, and as an important constituent part of information industry, a display technology plays an important role all the time in the development process of the information technology. Nowadays, various display devices are present in various fields of daily life and work, and AMOLED (Active Matrix Organic Light Emitting Diode) is considered as a new generation display technology following LCD (liquid crystal display) devices due to its characteristics of high contrast, high color gamut, wide viewing angle, etc.
The AMOLED is classified into two light emitting modes of top emission and bottom emission, in which the top emission mode has a characteristic of high aperture ratio. Aiming at the problem of short service life of the conventional OLED, the display degradation caused by the short service life can be effectively relieved by the high aperture ratio. However, since the top emission mode requires the light emitted from the OLED to pass through the cathode, the thickness of the cathode needs to be very thin to ensure the transmittance of the light. However, the reduction of the thickness of the cathode film layer increases the sheet resistance of the cathode, and further causes inconsistent voltage drop generated at different positions of the cathode film layer, thereby affecting the voltage difference between the anode and the cathode of the OLED and finally affecting the brightness uniformity of the display device.
Disclosure of Invention
The disclosure provides a voltage drop compensation method, a voltage drop compensation device and an electronic device, which can eliminate the influence of voltage drop generated by a cathode film layer on the brightness uniformity of a display device.
In one aspect, the present disclosure provides a voltage drop compensation method for a display panel, where the display panel includes a plurality of pixel units, and the plurality of pixel units share a cathode film layer. The voltage drop compensation method includes:
dividing a display area of the display panel into a plurality of display partitions, each of the display partitions including a plurality of pixel units;
calculating impedance data of the cathode film layer corresponding to each display partition;
calculating current data flowing through each of the display sections at the loaded target display data voltage;
calculating voltage drop generated by the cathode film layer corresponding to each display subarea according to the impedance data and the current data;
and compensating the display brightness of each display subarea based on the voltage drop generated by the cathode film layer corresponding to each display subarea.
In some embodiments of the present disclosure, the step of calculating the impedance data of the cathode film layer corresponding to each of the display sections includes:
acquiring the length and the width of each display subarea and the sheet resistance of the cathode film layer;
and calculating the impedance of the cathode film layer corresponding to each display partition according to the length and the width of each display partition and the square resistance of the cathode film layer.
In some embodiments of the present disclosure, each of the pixel units in the display panel includes a plurality of light emitting devices, and the calculating of the current data flowing through each of the display partitions under the loading of the target display data voltage includes:
calculating the light emitting current of each light emitting device contained in each pixel unit under the condition that the target display data voltage is loaded, and summing the light emitting currents of all the light emitting devices contained in the pixel unit to obtain the light emitting current of the pixel unit;
for each display partition, the light emitting currents of all pixel units included in the display partition are summed to obtain current data flowing through the display partition under the loading of the target display data voltage.
In some embodiments of the present disclosure, the step of calculating, for each pixel unit, a light emitting current of each light emitting device included in the pixel unit under the loading of the target display data voltage includes:
carrying out simulation test on each pixel unit of the display panel to obtain a voltage-current fitting equation of each pixel unit;
calculating a light emitting current of each of the light emitting devices based on the voltage-current fitting equation and the target display data voltage.
In some embodiments of the present disclosure, the step of calculating a voltage drop generated by the cathode film layer corresponding to each of the display regions according to the impedance data and the current data includes:
calculating the voltage drop generated by the cathode film layer corresponding to each column of the display subarea according to the following formula:
ΔV 1，n ＝R 1，n ×(I 1，n +I 2，n +……+I max-1，n +I max，n )；
ΔV m，n ＝ΔV m-1，n +R 1，n ×(I 1，n +……+I max-m，n +I max-m+1，n )；
wherein m represents the m-th row, n represents the n-th column, Δ V m，n Voltage drop, R, of the display partition representing the m-th row and n-th column m，n Impedance data, I, representing the display sub-area of the m-th row and n-th column m，n Current data of the display section of the mth row and nth column are indicated, and max indicates the maximum number of rows.
In some embodiments of the present disclosure, the display panel further includes a pixel driving unit corresponding to each pixel unit, each pixel driving unit includes a plurality of sub-pixel driving circuits respectively configured to drive the plurality of light emitting devices in the corresponding pixel unit to emit light, each sub-pixel driving circuit includes a capacitor configured to keep a voltage difference between a gate and a source of the first driving switch tube in the sub-pixel driving circuit stable, and the step of compensating the display luminance of each display partition based on the voltage drop generated by the cathode film layer corresponding to each display partition includes:
acquiring a coupling loss rate of a capacitor in each sub-pixel driving circuit;
and compensating the data voltage of each light-emitting device based on the voltage drop generated by the cathode film layer corresponding to each display partition and the coupling loss rate of the capacitor in each sub-pixel driving circuit.
In another aspect, the present disclosure further provides a voltage drop compensation device for a display panel, where the display panel includes a plurality of pixel units, and the plurality of pixel units share a cathode film layer. The voltage drop compensation device includes:
a partition dividing unit for dividing a display area of the display panel into a plurality of display partitions each including a plurality of pixel units;
the impedance calculation unit is used for calculating the impedance data of the cathode film layer corresponding to each display partition;
a current calculating unit for calculating current data flowing through each of the display sections under the loading of a target display data voltage;
the voltage drop calculating unit is used for calculating voltage drops generated by the cathode film layer corresponding to each display subarea according to the impedance data and the current data;
and the compensation unit is used for compensating the display brightness of each display partition based on the voltage drop generated by the cathode film layer corresponding to each display partition.
In some embodiments of the present disclosure, the impedance calculating unit calculates the impedance data of the cathode film layer corresponding to each of the display sections as follows:
acquiring the length and the width of each display subarea and the sheet resistance of the cathode film layer;
and calculating the impedance of the cathode film layer corresponding to each display partition according to the length and the width of each display partition and the square resistance of the cathode film layer.
In some embodiments of the present disclosure, each of the pixel units in the display panel includes a plurality of light emitting devices, and the current calculating unit calculates current data flowing through each of the display partitions under the loading of the target display data voltage in the following manner:
calculating the light emitting current of each light emitting device contained in each pixel unit under the condition that the target display data voltage is loaded, and summing the light emitting currents of all the light emitting devices contained in the pixel unit to obtain the light emitting current of the pixel unit;
for each display partition, the light emitting currents of all pixel units included in the display partition are summed to obtain current data flowing through the display partition under the loading of the target display data voltage.
In some embodiments of the present disclosure, the current calculating unit calculates, for each pixel unit, a light emitting current of each light emitting device included in the pixel unit under the load of the target display data voltage in the following manner:
calculating a light emission current of each of the light emitting devices based on a voltage-current fitting equation of each pixel unit previously obtained through a simulation test and the target display data voltage.
In some embodiments of the present disclosure, the voltage drop calculating unit calculates the voltage drop generated by the cathode film layer corresponding to each column of the display partition according to the following formula:
ΔV 1，n ＝R 1，n ×(I 1，n +I 2，n +……+I max-1，n +I max，n )；
ΔV m，n ＝ΔV m-1，n +R 1，n ×(I 1，n +……+I max-m，n +I max-m+1，n )；
where m denotes the m-th row, n denotes the n-th column, Δ V m，n Voltage drop of display partition representing mth row and nth column, R m，n Impedance data, I, representing the display sub-area of the m-th row and n-th column m，n Current data of the display section of the mth row and nth column are indicated, and max indicates the maximum number of rows.
In some embodiments of the present disclosure, the display panel further includes a pixel driving unit corresponding to each of the pixel units, each of the pixel driving units includes a plurality of sub-pixel driving circuits, respectively configured to drive the plurality of light emitting devices in the corresponding pixel unit to emit light, each of the sub-pixel driving circuits includes a capacitor, and is configured to keep a voltage difference between a gate and a source of the first driving switch tube in the sub-pixel driving circuit stable, wherein the compensation unit compensates the display luminance of each of the display partitions based on a voltage drop generated by a cathode film layer corresponding to each of the display partitions in the following manner:
acquiring a coupling loss rate of a capacitor in each sub-pixel driving circuit;
and compensating the data voltage of each light-emitting device based on the voltage drop generated by the cathode film layer corresponding to each display partition and the coupling loss rate of the capacitor in each sub-pixel driving circuit.
In yet another aspect, the present disclosure provides an electronic device comprising the voltage drop compensation apparatus of any one of the above.
The voltage drop compensation method, the voltage drop compensation device and the electronic equipment can solve the problem of poor brightness uniformity of a display device caused by voltage drop generated by the cathode film layer. In the technical solution provided by the embodiment of the present disclosure, a display area of the display device is first divided into a plurality of display partitions, impedance data of a cathode film layer in each display partition is then acquired, current data flowing through each display partition is obtained under a target display data voltage, and a voltage drop generated by the cathode film layer in each display partition is obtained according to the acquired impedance data and current data. And then, compensating the data voltage of each OLED in each display subarea by combining the coupling loss rate of the capacitor in the sub-pixel driving circuit, so that the voltage difference value between the anode and the cathode of each OLED can accord with the respective theoretical working voltage difference value, and the requirement of the brightness uniformity of a display picture is met.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other embodiments based on the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a sub-pixel driving circuit according to an embodiment of the disclosure;
fig. 3 is a schematic structural diagram of a light emitting device provided in an embodiment of the present disclosure;
FIG. 4 is a schematic flow chart diagram illustrating a voltage drop compensation method according to an embodiment of the disclosure;
FIG. 5 is a display area division diagram provided by an embodiment of the present disclosure;
FIG. 6 is a diagram illustrating a relationship between a data voltage and a light emitting current according to an embodiment of the disclosure;
fig. 7 is a schematic structural diagram of a voltage drop compensation device according to an embodiment of the disclosure.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without inventive step, are intended to be within the scope of the present disclosure. Furthermore, it should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, and are not intended to limit the present disclosure. In the present disclosure, unless otherwise specified, use of the directional terms "upper" and "lower" generally refer to upper and lower, and specifically to the orientation of the drawing figures in the drawings, in the actual use or operating condition of the device; while "inner" and "outer" are with respect to the outline of the device.
The present disclosure provides a voltage drop compensation method, which can be applied to at least an Active Matrix Organic Light Emitting Diode (AMOLED) display panel. Therefore, before describing the voltage drop compensation method provided by the present disclosure, the structure and the operation principle of the display device to which the compensation method is applied will be described first.
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present disclosure, in which the display device is an AMOLED display device.
Specifically, the illustrated AMOLED display device includes a timing controller 100, a data driver 110, an emission control driver 120, a scan control driver 130, and a display panel 140.
The timing controller 100 is configured to provide working driving signals to the data driver 110, the emission control driver 120, the scan control driver 130, and the display panel 140, so that the data driver 110 provides a data writing signal to the display panel 140, the emission control driver 120 provides an emission control signal to the display panel 140, and the scan control driver 130 provides a scan driving signal to the display panel 140.
Further, the display panel 140 includes an array substrate and an organic light emitting layer (not shown), and the display panel 140 may be divided into a display region and a non-display region (not shown). The part of the array substrate corresponding to the display area comprises a plurality of pixel driving units distributed in an array mode, and each pixel driving unit comprises a plurality of sub-pixel driving circuits.
In general, for the AMOLED, each pixel driving unit includes a first sub-pixel driving circuit, a second sub-pixel driving circuit, and a third sub-pixel driving circuit, which are respectively used for driving a red light emitting diode, a green light emitting diode, and a blue light emitting diode to emit light. The red light emitting diode, the green light emitting diode and the blue light emitting diode jointly form a pixel unit. The pixel units are arranged in the organic light-emitting layer and correspond to the pixel driving units in the array substrate one to one.
Fig. 2 is a schematic structural diagram of a sub-pixel driving circuit according to an embodiment of the disclosure.
In the sub-pixel driving circuit, T1 represents a first driving switching tube, T2 represents a second auxiliary switching tube, T3 represents a third auxiliary switching tube, C represents a capacitor, OLED represents an organic light emitting device, VDD represents a first power voltage, VSS represents a second power voltage, WR and RD represent a first scanning signal and a second scanning signal, respectively, V DATA Representing data voltage, monitor representing an external detection module.
Specifically, the gate of T1 is connected to a first node G, a first terminal is connected to a second node S, and a second terminal is connected to a first power source terminal to receive VDD, wherein the first terminal is the source of T1.
The gate of T2 is connected to the first scan signal terminal for receiving WR, the first terminal is connected to the first node G, the second terminal is connected to the data signal terminal for receiving V DATA 。
The grid of T3 is connected with the second scanning signal end to receive RD, the first end is connected with the second node S, and the second end is connected with the external detection module.
The capacitor C has a first terminal connected to the first node G and a second terminal connected to the second node S.
Note that T1, T2, and T3 shown in fig. 2 are all N-type thin film transistors. It is understood that, for an N-type thin film transistor, applying a high level to its gate can control its source and drain to be on, and applying a low level to its gate can control the channel between its source and drain to be off. And the source electrode and the drain electrode of the thin film transistor are symmetrically arranged, and can be interchanged according to the change of actual conditions.
Illustratively, the operation of the sub-pixel driving circuit shown in fig. 2 includes a data voltage writing phase and a display phase.
In the data voltage writing phase, T2 is turned on, and the first node G is written with the data voltage.
In the display period, T2 and T3 are turned off, T1 is turned on, and under the action of VDD, the voltage of the second node S is increased,
when the difference between the voltage of the second node S and VSS satisfies a preset threshold, the light emitting device corresponding to the sub-pixel circuit emits light, and the light emitting brightness is related to the data voltage written to the first node G. At this moment, the capacitor C has the function of maintaining the voltage difference V between the gate and the source of the T1 GS And (4) stabilizing.
It will be appreciated that an OLED starts to emit light when there is a voltage difference between its anode and cathode, and that by adjusting the voltage difference between its anode and cathode, the OLED can be controlled to emit light of different brightness.
In the AMOLED display device, VDD and VSS respectively provide an anode voltage and a cathode voltage for the OLED, and VSS is directly applied to a cathode terminal (e.g., a whole surface of a cathode film layer) of the OLED through a conductive structure in the display device, and VDD outputs a voltage value meeting a display requirement to an anode terminal (a second node S) of the OLED through a driving switch in the sub-pixel driving circuit.
Referring to fig. 3, when the voltage of the anode of the OLED is equal to the voltage of the second node S, the OLED can emit light with a corresponding brightness when the voltage difference between VSS applied to the cathode of the OLED and the second node S satisfies the theoretical operating voltage difference of the OLED. Specifically, when a voltage difference is formed between an anode and a cathode of an OLED, holes and electrons are injected into a light emitting layer of the OLED from the anode and the cathode, respectively, and then the holes and the electrons are combined to generate excitons, and finally, excited state energy of the excitons is inactivated by radiation to generate photons, thereby releasing energy.
Ideally, when the display device loads the target display data voltage, the voltage difference between the anode and the cathode of the OLED should be constantly equal to the respective theoretical operating voltage difference, so as to satisfy the brightness requirement of the display screen.
However, for the OLED device of the top emission mode, in order to secure light transmittance, it is generally necessary to thin the cathode layer in the organic light emitting layer. With the decrease of the film thickness, the impedance of the cathode film layer gradually increases, VSS generates a voltage drop in the transmission process, and since the plurality of OLEDs are distributed in the display area of the whole display device in an array manner, the transmission paths between VSS and the OLEDs are different, so that the voltage drops generated at different positions of the cathode film layer during VSS transmission are inconsistent, and the voltage difference variation between the anode and the cathode of each OLED is different, which finally affects the brightness uniformity of the display device.
In order to solve the above problem, the present disclosure proposes a voltage drop compensation method.
Please refer to fig. 4, which is a flowchart illustrating a voltage drop compensation method according to an embodiment of the present disclosure.
Step 1: a display area of a display panel is divided into a plurality of display sections.
In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the following technical solutions are exemplarily described below by taking the AMOLED display device with a display resolution of 3840 × 2160 (4K) as an example.
According to step 1, the display area of the 4K display device is divided to form a plurality of display partitions, and each display partition contains a plurality of pixel units.
Illustratively, the entire display area is divided into 40 × 40 display areas, as shown in fig. 5, it can be understood that the number of pixel units in each display area is 96 × 54 for a 4K display device.
Step 2: and calculating the impedance data of the cathode film layer corresponding to each display partition.
Specifically, the area of each display section is calculated according to the size of the entire display area, or the size of a single pixel unit. It is understood that the size of the display area in the display device, or the size of the pixel unit, as well as the resolution, are intrinsic parameters of the display device, which are determined before the design and production of the display device, and therefore, the source of the parameters is not described in the embodiments of the present disclosure.
The impedance data of the cathode film layer can be calculated according to formula one.
Wherein L and W respectively represent the length and width of the display region, and R s The sheet resistance of the cathode film layer is shown.
It is understood that the specific value of the sheet resistance needs to be determined according to the material of the cathode film layer, and the embodiment does not limit the specific value.
And 3, step 3: current data flowing through each display partition at the loaded target display data voltage is calculated.
In one embodiment provided by the present disclosure, each pixel cell includes one red light emitting diode, one green light emitting diode, and one blue light emitting diode. Each led is independently controlled by a sub-pixel drive circuit (fig. 2) capable of adjusting the voltage at its anode. Therefore, the red light-emitting diode, the green light-emitting diode and the blue light-emitting diode in one pixel unit are in parallel connection, each pixel unit is also in parallel connection, and the current flowing through each pixel unit is finally converged on the whole cathode film layer.
When the display device loads the target display data voltage to display the target picture, the current data in one display subarea can be obtained according to the current value generated by each pixel unit in the display subarea, and the current value generated by each pixel unit can be obtained by the current value generated by each light-emitting diode in the display subarea.
Specifically, for each pixel unit, the light emitting current of each light emitting device included in the pixel unit under the target display data voltage is calculated, the light emitting currents of all the light emitting devices included in the pixel unit are summed to obtain the light emitting current of the pixel unit, and then the light emitting currents of all the pixel units included in one display partition are summed to obtain the current data flowing through the display partition under the target display data voltage.
For example, for a display partition containing 96 × 54 pixel cells, the corresponding current data is: 96X 54 (I) OLED_R +I OLED_G +I OLED_B ) Wherein, I OLED_R 、I OLED_G 、I OLED_B Respectively representing the light emitting current of the red light emitting diode, the green light emitting diode and the blue light emitting diode under the condition that the display device loads the target display data voltage.
Further, as can be seen from the foregoing, the light emission of each OLED is controlled by a separate sub-pixel driving circuit, and the data voltage refers to the data voltage written to the gate of T1 after T2 and T3 are turned on before the OLED emits light. Subsequently, T2 and T3 are turned off, the gate of T1 is floating, and V of T1 is under the action of the capacitor C GS It is stabilized, T1 remains on, VDD gradually charges the anode (node S) of the OLED, and the OLED starts to emit light when the voltage difference between the anode and the cathode meets its operating voltage difference.
Therefore, when the display device is loaded with the target display data voltage, the I can be calculated according to the target display data voltage OLED_R 、I OLED_G 、I OLED_B The value of (c). Specifically, the display current has a relationship with the data voltage as shown in fig. 6.
Specifically, the data voltage (V) may be applied to the display device in advance before it is shipped from a factory DATA ) -luminous current (I) OLED ) And (5) simulating and testing to obtain constants a, b and c in a voltage-current fitting equation (formula II) of the OLED according to the simulation data. Furthermore, when the display apparatus is loaded with the target display data voltage, the data voltage (V) corresponding to each light emitting device at that time can be used DATA_R 、V DATA_G 、V DATA_B ) Fitting out the corresponding luminescence current (I) OLED_R 、I OLED_G 、I OLED_B )。
I OLED ＝a×(V DATA -b) c (formula two)
And 4, step 4: and calculating the voltage drop generated by the cathode film layer corresponding to each display subarea according to the impedance data and the current data.
Specifically, according to the current data I generated in the display section (m, n) m，n And impedance data R of cathode film layer in the display region m，n Calculating the voltage drop DeltaV generated by the cathode film layer in the display subarea (m, n) m，n Where m denotes the m-th row and n denotes the n-th column. Referring to FIG. 5, in one embodiment of the present disclosure, VSS is supplied from the bottom of the display device into the display area, and therefore, the voltage drop generated by the cathode film layer in each display region can be calculated by column addition.
Specifically, the voltage drop generated by the cathode film layer corresponding to each column of display partition can be calculated according to the following formula:
ΔV 1，n ＝R 1，n ×(I 1，n +I 2，n +……+I max-1，n +I max，n )；
ΔV m，n ＝ΔV m-1，n +R 1，n ×(I 1，n +……+I max-m，n +I max-m+1，n )；
where m denotes the m-th row, n denotes the n-th column, Δ V m，n Voltage drop, R, of the display partition representing the m-th row and n-th column m，n Impedance data, I, representing the display sub-area of the m-th row and n-th column m，n Current data of the display section of the mth row and nth column are indicated, and max indicates the maximum number of rows.
By way of example:
for the display sub-area (1, 1), Δ V 1，1 ＝R 1，1 ×(I 1，1 +I 2，1 +……+I 39，1 +I 40，1 )。
For the display sub-area (2, 1), Δ V 2，1 ＝ΔV 1，1 +R 2，1 ×(I 2，1 +……+I 39，1 +I 40，1 )。
For the display sub-area (39, 1), Δ V 39，1 ＝ΔV 38，1 +R 39，1 ×(I 39，1 +I 40，1 )。
For a display partition (40, 1), Δ V 40，1 ＝ΔV 39，1 +R 40，1 ×I 40，1 。
And 5: and compensating the display brightness of each display subarea based on the voltage drop generated by the cathode film layer corresponding to each display subarea.
For AMOLED, the cathode film layer is a whole-surface structure, and theoretically the cathode voltage should be the same and constant everywhere.
Therefore, even if a voltage drop occurs at the cathode, since the voltage at the cathode of the OLED cannot be independently adjusted, it is generally ensured that the voltage difference between the anode and the cathode is kept stable by adjusting the voltage at the anode of the OLED.
The anode voltage of the OLED and V of T1 in the sub-pixel driving circuit GS And (6) correlating.
As can be seen from the foregoing, each OLED is controlled by a separate sub-pixel drive circuit (fig. 2). When the driving thin film transistor T1 in the sub-pixel driving circuit is turned on, the first node G of the gate of the T1 is in a floating state, and V is at the moment G ＝V DATA ，V GS ＝V DATA -V S 。
Under the action of VDD, V S The voltage at the first node G gradually rises due to the coupling of the capacitor C, so as to ensure that V is increased GS And (4) stabilizing.
However, since the capacitor C has a coupling loss, in practice, V G Is less than V S The amount of change in (c).
Luminous current and V of OLED GS The relationship of (c) is shown in formula three.
I OLED ＝K×(V GS -V th ) 2 (formula three)
Wherein, V th Denotes a threshold voltage of T1, and K denotes a parameter relating to carrier mobility, gate insulating layer capacitance per unit area, channel width-to-length ratio, and the like of T1.
As can be seen, the V gradually increases S Although capable of functioning to maintain the voltage difference between the anode and cathode of the OLED, the coupling loss is such that V GS Decrease, and then cause I OLED And decreases.
Therefore, when compensating for a voltage drop generated in a cathode film layer of an OLED by a data voltage, V should be considered G And V S The rate of coupling loss therebetween.
Taking the display partition (m, n) as an example, the voltage drop generated by the cathode film layer in the display partition is assumed to be 0.2V.
If V G And V S There is no coupling loss between them, so the data voltage V corresponding to OLED is not needed DATA_0 And (6) compensating. Because of V GS Unchanged, T1 remains open, V S The voltage of the cathode film layer is continuously increased under the charging action of VDD, so that the reduction of the display brightness caused by the voltage drop of the cathode film layer is compensated.
If V G And V S There is a coupling loss between them, and the coupling loss rate is A%, it is necessary to combine the coupling loss rate with the data voltage V of the OLED DATA_0 And (6) compensating.
This is due to the presence of coupling losses which cause V GS Is gradually decreased, and according to the third formula, I OLED Will follow V GS And decreases. And, as one possible scenario, when V GS Reduced to V equal to T1 th (threshold voltage), the T1 is turned off, and VDD stops charging the second node S, and at this moment, it cannot be guaranteed that the voltage of the anode of the OLED can compensate the voltage drop generated by the cathode film layer. Therefore, it is necessary to compensate the data voltage of the OLED in combination with the coupling loss rate of the capacitor C, and in particular, the compensated data voltage V DATA ＝V DATA_0 +0.2V×A％。
The display device and the voltage drop compensation method thereof can solve the problem of poor brightness uniformity of the display device caused by voltage drop generated by the cathode film layer. Specifically, the voltage drop compensation method can be used in at least an AMOLED display device, and in the technical solution provided in the embodiment of the present disclosure, a display area of the display device is first divided into a plurality of display partitions, impedance data of a cathode film layer in each display partition is then obtained, and when a target display data voltage is loaded on the display device, current data flowing through each display partition is obtained, and a voltage drop generated by the cathode film layer in each display partition is obtained according to the obtained impedance data and current data. And finally, compensating the data voltage of each OLED in each display subarea by combining the coupling loss rate of the capacitor in the sub-pixel driving circuit, so that the voltage difference value between the anode and the cathode of each OLED can accord with the respective theoretical working voltage difference value, the brightness requirement of a display picture is met, and the uniformity of the display brightness of the display picture is ensured.
The present disclosure also provides a voltage drop compensation device for a display panel, and the display panel includes a plurality of pixel units sharing a cathode film layer.
Specifically, please refer to fig. 7, which is a schematic structural diagram of a voltage drop compensation apparatus according to an embodiment of the present disclosure.
As shown in fig. 7, the voltage drop compensation device 700 includes: a partition dividing unit 710, an impedance calculating unit 720, a current calculating unit 730, a voltage drop calculating unit 740, and a compensating unit 750.
The partition dividing unit 710 is configured to divide a display area of the display panel into a plurality of display partitions, each of the display partitions including a plurality of pixel units; the impedance calculating unit 720 is used for calculating the impedance data of the cathode film layer corresponding to each display partition; the current calculating unit 730 is used for calculating current data flowing through each display partition under the loading of the target display data voltage; the voltage drop calculating unit 740 is configured to calculate a voltage drop generated by the cathode film layer corresponding to each display partition according to the impedance data and the current data; the compensation unit 750 is configured to compensate the display brightness of each display partition based on the voltage drop generated by the cathode film layer corresponding to each display partition.
In some embodiments of the disclosure, the impedance calculating unit 720 calculates the impedance data of the cathode film layer corresponding to each of the display regions as follows:
acquiring the length and the width of each display subarea and the sheet resistance of the cathode film layer;
and calculating the impedance of the cathode film layer corresponding to each display partition according to the length and the width of each display partition and the square resistance of the cathode film layer.
In some embodiments of the present disclosure, each of the pixel units in the display panel includes a plurality of light emitting devices, and the current calculating unit 730 calculates current data flowing through each of the display partitions under the loading of the target display data voltage in the following manner:
calculating the light emitting current of each light emitting device contained in each pixel unit under the condition that the target display data voltage is loaded, and summing the light emitting currents of all the light emitting devices contained in the pixel unit to obtain the light emitting current of the pixel unit;
and summing the luminous currents of all the pixel units contained in each display subarea to obtain current data flowing through the display subarea under the condition of loading the target display data voltage.
In some embodiments of the present disclosure, the current calculating unit 730 calculates, for each pixel unit, a light emitting current of each light emitting device included in the pixel unit under the loading of the target display data voltage in the following manner:
calculating a light emission current of each of the light emitting devices based on a voltage-current fitting equation of each pixel unit previously obtained through a simulation test and the target display data voltage.
In some embodiments of the present disclosure, the voltage drop calculating unit 740 calculates the voltage drop generated by the cathode film layer corresponding to each column of the display area according to the following formula:
ΔV 1，n ＝R 1，n ×(I 1，n +I 2，n +……+I max-1，n +I max，n )；
ΔV m，n ＝ΔV m-1，n +R 1，n ×(I 1，n +……+I max-m，n +I max-m+1，n )；
where m denotes the m-th row, n denotes the n-th column, Δ V m，n Voltage drop of display partition representing mth row and nth column, R m，n RepresentImpedance data of display partition of mth row and nth column, I m，n Current data of the display section of the mth row and nth column are indicated, and max indicates the maximum number of rows.
In some embodiments of the present disclosure, the display panel further includes a pixel driving unit corresponding to each of the pixel units, each of the pixel driving units includes a plurality of sub-pixel driving circuits respectively configured to drive the plurality of light emitting devices in the corresponding pixel unit to emit light, and each of the sub-pixel driving circuits includes a capacitor configured to keep a voltage difference between a gate and a source of the first driving switch tube in the sub-pixel driving circuit stable. The compensation unit 750 compensates the display brightness of each display partition based on the voltage drop generated by the cathode film layer corresponding to each display partition as follows:
acquiring a coupling loss rate of a capacitor in each sub-pixel driving circuit;
and compensating the data voltage of each light-emitting device based on the voltage drop generated by the cathode film layer corresponding to each display partition and the coupling loss rate of the capacitor in each sub-pixel driving circuit.
It should be noted that some aspects of the voltage drop compensation device provided in the present disclosure are the same as or similar to the voltage drop compensation method described above, and are not described herein again.
The present disclosure also provides an electronic device including the voltage drop compensation apparatus 700 described in any of the above embodiments.
The voltage drop compensation method, device and electronic device provided by the embodiments of the present disclosure are described in detail above, and specific examples are applied herein to illustrate the principles and embodiments of the present disclosure, and the description of the embodiments above is only used to help understand the method and core ideas of the present disclosure; meanwhile, for those skilled in the art, according to the idea of the present disclosure, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present description should not be construed as a limitation to the present disclosure.
Claims (9)
1. A voltage drop compensation method for a display panel, the display panel including a plurality of pixel units, the plurality of pixel units sharing a cathode film layer, the method comprising:
dividing a display area of the display panel into a plurality of display partitions, each of the display partitions including a plurality of pixel units;
calculating impedance data of the cathode film layer corresponding to each display partition;
calculating current data flowing through each of the display sections at the loaded target display data voltage;
calculating voltage drop generated by the cathode film layer corresponding to each display subarea according to the impedance data and the current data;
compensating the display brightness of each display subarea based on the voltage drop generated by the cathode film layer corresponding to each display subarea;
the display panel further comprises pixel driving units which are in one-to-one correspondence with the pixel units, each pixel driving unit comprises a plurality of sub-pixel driving circuits which are respectively used for driving a plurality of light emitting devices in the corresponding pixel unit to emit light, and each sub-pixel driving circuit comprises a capacitor which is used for keeping the voltage difference between the grid electrode and the source electrode of a first driving switch tube in the sub-pixel driving circuit stable; the step of compensating the display brightness of each display subarea based on the voltage drop generated by the cathode film layer corresponding to each display subarea comprises the following steps:
acquiring a coupling loss rate of a capacitor in each sub-pixel driving circuit;
and compensating the data voltage of each light-emitting device based on the voltage drop generated by the cathode film layer corresponding to each display partition and the coupling loss rate of the capacitor in each sub-pixel driving circuit.
2. The method of claim 1, wherein the step of calculating the impedance data of the cathode film layer corresponding to each of the display sections comprises:
acquiring the length and the width of each display subarea and the square resistance of the cathode film layer;
and calculating the impedance of the cathode film layer corresponding to each display partition according to the length and the width of each display partition and the square resistance of the cathode film layer.
3. The method of claim 2, wherein each of the pixel cells in the display panel comprises a plurality of light emitting devices, and the step of calculating current data flowing through each of the display segments at the loaded target display data voltage comprises:
calculating the light emitting current of each light emitting device contained in each pixel unit under the condition that the target display data voltage is loaded, and summing the light emitting currents of all the light emitting devices contained in the pixel unit to obtain the light emitting current of the pixel unit;
for each display partition, the light emitting currents of all pixel units included in the display partition are summed to obtain current data flowing through the display partition under the loading of the target display data voltage.
4. The method of claim 3, wherein the step of calculating, for each pixel cell, the light emitting current of each light emitting device included in the pixel cell under the loading of the target display data voltage comprises:
carrying out simulation test on each pixel unit of the display panel to obtain a voltage-current fitting equation of each pixel unit;
calculating a light emitting current of each of the light emitting devices based on the voltage-current fitting equation and the target display data voltage.
5. A voltage drop compensation device for a display panel, the display panel including a plurality of pixel units, the plurality of pixel units sharing a cathode film layer, the device comprising:
a partition dividing unit for dividing a display area of the display panel into a plurality of display partitions each including a plurality of pixel units;
the impedance calculation unit is used for calculating the impedance data of the cathode film layer corresponding to each display partition;
a current calculating unit for calculating current data flowing through each of the display sections under the loading of a target display data voltage;
the voltage drop calculating unit is used for calculating voltage drops generated by the cathode film layer corresponding to each display subarea according to the impedance data and the current data;
the compensation unit is used for compensating the display brightness of each display partition based on the voltage drop generated by the cathode film layer corresponding to each display partition;
the display panel further comprises pixel driving units which are in one-to-one correspondence with the pixel units, each pixel driving unit comprises a plurality of sub-pixel driving circuits which are respectively used for driving a plurality of light emitting devices in the corresponding pixel unit to emit light, and each sub-pixel driving circuit comprises a capacitor which is used for keeping the voltage difference between the grid electrode and the source electrode of a first driving switch tube in the sub-pixel driving circuit stable; the compensation unit compensates the display brightness of each display partition on the basis of the voltage drop generated by the cathode film layer corresponding to each display partition in the following manner:
acquiring a coupling loss rate of a capacitor in each sub-pixel driving circuit;
and compensating the data voltage of each light-emitting device based on the voltage drop generated by the cathode film layer corresponding to each display partition and the coupling loss rate of the capacitor in each sub-pixel driving circuit.
6. The apparatus of claim 5, wherein the impedance calculating unit calculates the impedance data of the cathode film layer corresponding to each of the display sections as follows:
acquiring the length and the width of each display subarea and the sheet resistance of the cathode film layer;
and calculating the impedance of the cathode film layer corresponding to each display partition according to the length and the width of each display partition and the square resistance of the cathode film layer.
7. The apparatus according to claim 6, wherein each of the pixel units in the display panel includes a plurality of light emitting devices, and the current calculating unit calculates the current data flowing through each of the display sections at the loaded target display data voltage in such a manner that:
calculating the light emitting current of each light emitting device contained in each pixel unit under the condition that the target display data voltage is loaded, and summing the light emitting currents of all the light emitting devices contained in the pixel unit to obtain the light emitting current of the pixel unit;
for each display partition, the light emitting currents of all pixel units included in the display partition are summed to obtain current data flowing through the display partition under the loading of the target display data voltage.
8. The apparatus according to claim 7, wherein the current calculating unit calculates, for each pixel unit, a light emitting current of each light emitting device included in the pixel unit under the application of the target display data voltage, in the following manner:
calculating a light emitting current of each of the light emitting devices based on a voltage-current fitting equation of each pixel unit previously obtained through a simulation test and the target display data voltage.
9. An electronic device, characterized in that the electronic device comprises a voltage drop compensation device according to any one of claims 5-8.
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