CN114613318B - Display module, driving method thereof and display device - Google Patents

Display module, driving method thereof and display device Download PDF

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Publication number
CN114613318B
CN114613318B CN202210245264.8A CN202210245264A CN114613318B CN 114613318 B CN114613318 B CN 114613318B CN 202210245264 A CN202210245264 A CN 202210245264A CN 114613318 B CN114613318 B CN 114613318B
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China
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voltage
compensation
data
display
coupled
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CN114613318A (en
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曾怡洋
陆利丰
黄建才
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Xiamen Tianma Microelectronics Co Ltd
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Xiamen Tianma Microelectronics Co Ltd
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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]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3258—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The embodiment of the invention provides a display module, a driving method thereof and a display device. The display module comprises a display area and a non-display area; the non-display area comprises a first non-display area which is positioned on one side of the display area in a first direction, the first non-display area comprises a plurality of voltage terminals, and the voltage terminals comprise a data voltage terminal and a power supply voltage terminal; the display module comprises a data line and a power line, wherein one end of the data line is coupled with a data voltage terminal; one end of the power line is coupled to the power voltage terminal. In some embodiments, a data voltage compensation module is provided for generating a compensation voltage for compensating for a voltage drop of at least a portion of the data voltage as it is transmitted on the data line. In other embodiments, a supply voltage compensation module is provided for compensating for a voltage drop in a supply voltage signal transmitted across at least a portion of a segment of a supply line. The invention can improve the problem of uneven display and improve the display uniformity.

Description

Display module, driving method thereof and display device
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display module, a driving method thereof, and a display device.
Background
In the prior art, a light-emitting diode (LED) is widely used as a light-emitting device in the field of display technology. In the display field, light emitting diodes generally include organic light emitting diodes and inorganic light emitting diodes divided by a light emitting layer material, and Mini LEDs, micro LEDs, and the like are divided by a size. However, the conventional display panel having the display pixels formed of light emitting diodes has a problem of uneven display.
Disclosure of Invention
The embodiment of the invention provides a display module, a driving method thereof and a display device, which are used for solving the problem of uneven display in the prior art and improving the display uniformity.
In a first aspect, an embodiment of the present invention provides a display module, where the display module includes a display area and a non-display area; the non-display area comprises a first non-display area which is positioned on one side of the display area in a first direction, the first non-display area comprises a plurality of voltage terminals, and the voltage terminals comprise data voltage terminals;
the display module comprises a plurality of data lines extending in a first direction, and one ends of the data lines are coupled with data voltage terminals; the data line comprises a first data line, the first data line comprises a first locus and a second locus, and the distance between the first locus and the data voltage terminal is smaller than that between the second locus and the data voltage terminal;
The display module comprises a data voltage compensation module, wherein the data voltage compensation module is used for generating a compensation voltage, and the compensation voltage is used for compensating voltage drop when at least part of the data voltage is transmitted on a data line; wherein,,
the data voltage compensation module comprises at least one subtracter, wherein a first input end of the subtracter is coupled with the first locus, a second input end of the subtracter is coupled with the second locus, and an output end of the subtracter is used for outputting a voltage difference between the first locus and the second locus.
In a second aspect, an embodiment of the present invention provides a driving method of a display module, where the display module includes a display area and a non-display area; the non-display area comprises a first non-display area, the first non-display area comprises a plurality of voltage terminals, and the voltage terminals comprise data voltage terminals; the display area comprises a plurality of data lines extending in a first direction, and one ends of the data lines are coupled with data voltage terminals; the data line comprises a first data line, the first data line comprises a first locus and a second locus, and the distance between the first locus and the data voltage terminal is smaller than that between the second locus and the data voltage terminal;
the display module comprises a data voltage compensation module, wherein the data voltage compensation module is used for generating compensation voltage; the data voltage compensation module comprises at least one subtracter, wherein a first input end of the subtracter is coupled with a first locus, and a second input end of the subtracter is coupled with a second locus; the output end of the subtracter is used for outputting the voltage difference between the first position point and the second position point;
The driving method comprises the following steps:
dividing at least part of the display area defined by the first locus and the second locus into n compensation areas arranged in the first direction, wherein n is a positive integer, and n is more than or equal to 1;
in the display stage, compensation voltages are adopted to compensate voltage drops when data voltages corresponding to the n compensation areas are transmitted on the data lines respectively.
In a third aspect, an embodiment of the present invention provides another display module, where the display module includes a display area and a non-display area; the non-display area comprises a first non-display area, the first non-display area comprises a plurality of voltage terminals, and the voltage terminals comprise power supply voltage terminals;
the display panel comprises a power line extending in a first direction, and one end of the power line is coupled with a power voltage terminal; the power line comprises a first power line, the first power line comprises a third locus and a fourth locus, and the distance from the third locus to the power voltage terminal is smaller than the distance from the fourth locus to the power voltage terminal;
the display module comprises a power supply voltage compensation module, wherein the power supply circuit compensation module is used for compensating voltage drop of a power supply voltage signal transmitted on at least part of a line segment of a power supply line; wherein,,
the power supply voltage compensation module comprises at least one feedback circuit, the feedback circuit comprises a first input end, a second input end and an output end, the output end of the feedback circuit is coupled with the second input end of the feedback circuit, and the feedback circuit is used for controlling the voltage of the second input end of the feedback circuit to be equal to the voltage of the first input end of the feedback circuit; the feedback circuit comprises a first feedback circuit, a first input end of the first feedback circuit is coupled with the third locus, and a second input end of the first feedback circuit is coupled with the fourth locus.
In a fourth aspect, an embodiment of the present invention further provides a display apparatus, including a display module provided by any embodiment of the present invention.
The display module, the driving method thereof and the display device provided by the embodiment of the invention have the following beneficial effects:
in some embodiments, a data voltage compensation module is provided, the data voltage compensation module comprising a subtractor capable of detecting a voltage difference between a first location and a second location on a first data line, the voltage difference between the first location and the second location being indicative of a voltage drop generated during data voltage transfer. The data voltage compensation module can generate compensation voltage according to the voltage difference between the first position point and the second position point, and compensates the data voltage corresponding to the display area defined by the first position point and the second position point by using the compensation voltage, so that the voltage drop when at least part of the data voltage is transmitted on the data line is compensated by using the compensation voltage, the influence of the voltage drop of the data voltage on the luminous current is reduced, the brightness difference between all the luminous devices in the display area defined by the first position point and the second position point is reduced, the display non-uniformity problem is improved, and the whole display effect is improved.
In other embodiments, a supply voltage compensation module is provided, the supply voltage compensation module including a feedback circuit having a first input and a second input coupled to two sites on a first power line, respectively, and an output coupled to a second input of the feedback circuit. The feedback circuit is capable of controlling the voltage at its second input to be equal to the voltage at its first input, thereby enabling the voltages at the two sites on the first power line to be identical, thereby compensating for the voltage drop across the first power line with the feedback circuit. The power supply voltage received by the pixel circuit at the position far from the power supply voltage terminal is consistent with the power supply voltage received by the pixel circuit at the position close to the power supply voltage terminal, so that the influence of the voltage drop of the power supply voltage on the luminous current can be reduced, and the display uniformity is improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are some embodiments of the invention and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic diagram of a pixel circuit in a display module according to an embodiment of the invention;
fig. 2 is a schematic diagram of a display module according to an embodiment of the invention;
FIG. 3 is a flowchart of a driving method of a display module according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating a display module according to another embodiment of the present invention;
FIG. 5 is a schematic diagram of a voltage difference library according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a compensation voltage library table according to an embodiment of the present invention;
FIG. 7 is a block diagram of another display module according to an embodiment of the present invention;
FIG. 8 is a block diagram of another display module according to an embodiment of the present invention;
FIG. 9 is a block diagram of another display module according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of another display module according to an embodiment of the present invention;
FIG. 11 is a schematic diagram of another display module according to an embodiment of the present invention;
FIG. 12 is a schematic diagram of another display module according to an embodiment of the present invention;
FIG. 13 is a schematic diagram of another display module according to an embodiment of the present invention;
FIG. 14 is a schematic diagram of another display module according to an embodiment of the present invention;
FIG. 15 is a schematic diagram of another display module according to an embodiment of the present invention;
FIG. 16 is a schematic diagram of another display module according to an embodiment of the present invention;
FIG. 17 is a schematic diagram of another display module according to an embodiment of the present invention;
fig. 18 is a schematic diagram of a display device according to an embodiment of the invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
In the prior art, a driving chip is generally bound on a display panel, the driving chip is located at one side of a display area, and signals are provided to signal lines in the display area through the driving chip so as to drive the display area to display images. The current display area far from the driving chip has the problem of low brightness, namely the brightness of the display area near to the driving chip and the brightness of the display area far from the driving chip are different, so that uneven display is caused, and the display effect is affected. And such a problem of display unevenness becomes more remarkable as the size of the display panel increases.
In the display panel, a pixel circuit is provided, which supplies a light emitting current Id to the light emitting diode to drive the light emitting diode to emit light, and the magnitude of the light emitting current Id affects the light emitting luminance of the light emitting diode. Wherein the emission current id=k (Pvdd-Vdata) 2 K is a constant, pvdd is a power supply voltage, vdata is a data voltage, and the magnitude of the light emission current Id is related to Pvdd and Vdata. The display panel is provided therein with a power supply voltage line for supplying a power supply voltage to the pixel circuit and a data line for supplying a data voltage to the pixel circuit. And the power voltage line and the data line are coupled to the driving chip, that is, the data voltage and the power voltage are supplied from the driving chip, respectively. Because impedance exists on the power voltage line and the data line, voltage drop exists when the power voltage is transmitted from one end close to the driving chip to one end far away from the driving chip, and voltage drop also exists when the data voltage is transmitted from one end close to the driving chip to one end far away from the driving chip. The voltage drop of the power supply voltage and the voltage drop of the data voltage both affect the magnitude of the light emitting current Id, which results in the actual brightness of the light emitting device being lower than the expected brightness, which also results in the approach drivingThe reason why there is a difference in the luminance of the display area at the position of the driver chip and the luminance of the display area at the position away from the driver chip.
In order to solve the problems of the prior art, the present inventors contemplate compensating for the voltage drop of the data voltage and/or the power supply voltage to improve the problem of display unevenness.
The display module provided by the embodiment of the invention comprises a plurality of light emitting devices, wherein the light emitting devices are organic light emitting diodes or inorganic light emitting diodes. The embodiment of the invention does not limit the size of the light emitting device. The display module further comprises a plurality of pixel circuits, and the pixel circuits are used for driving the light emitting devices to emit light. Fig. 1 is a schematic diagram of a pixel circuit in a display module according to an embodiment of the invention, where, as shown in fig. 1, the pixel circuit includes a driving transistor Tm, a gate reset transistor T1, an electrode reset transistor T2, a data writing transistor T3, a threshold compensation transistor T4, a first light emitting control transistor T5, a second light emitting control transistor T6, and a storage capacitor Cst. The gate reset transistor T1 is coupled to the first node N1, the gate of the driving transistor Tm is coupled to the first node N1, the first pole of the driving transistor Tm is coupled to the second node N2, and the second pole of the driving transistor Tm is coupled to the third node N3. The driving transistor Tm is connected in series between the first light emission control transistor T5 and the second light emission control transistor T6. The data writing transistor T3 is coupled to the second node N2, and the threshold compensating transistor T4 is connected in series between the gate of the driving transistor Tm and the second pole of the driving transistor Tm. The electrode reset transistor T2 is coupled to the fourth node N4, the first electrode of the light emitting device 10 is coupled to the fourth node N4, and the second electrode of the light emitting device 10 is coupled to the negative power voltage line Pe. The first plate of the storage capacitor Cst and the first electrode of the first light emitting control transistor T5 are coupled to the positive power supply voltage line Pd. The first pole of the gate reset transistor T1 and the first pole of the electrode reset transistor T2 are both coupled to the reset signal line Ref, and the gate of the gate reset transistor T1 and the gate of the electrode reset transistor T2 are both coupled to the second scan line S2. The first pole of the Data writing transistor T3 is coupled to the Data line Data, and the gate of the Data writing transistor T3 and the gate of the threshold compensation transistor T4 are both coupled to the first scan line S1. The gate of the first light emitting control transistor T5 and the gate of the second light emitting control transistor T6 are both coupled to the light emitting control line E.
The pixel circuit in fig. 1 is only schematically shown, and is not intended to limit the present invention. The light emitting device 10 includes a stacked first electrode, a light emitting layer, and a second electrode. For the pixel circuit illustrated in fig. 1, the first electrode of the light emitting device 10 is an anode, the second electrode is a cathode, and the light emitting current id=k (Pvdd-Vdata) 2 Wherein Pvdd is a power supply voltage signal supplied from the positive power supply voltage line Pd, and Vdata is a Data voltage supplied from the Data line Data.
In an embodiment, fig. 2 is a schematic diagram of a display module according to an embodiment of the invention. As shown in fig. 2, the display module includes a display area AA and a non-display area BA; a light emitting device (not shown in fig. 2) is located in the display area AA. The non-display area BA includes a first non-display area BA1 located at a side of the display area AA in the first direction x, the first non-display area BA1 including a plurality of voltage terminals 20, the voltage terminals 20 including a data voltage terminal 21. The data voltage terminal 21 is an output port for the data voltage. The non-display area BA further includes a second non-display area BA2, and the second non-display area BA2 and the first non-display area BA1 are respectively located at both sides of the display area AA in the first direction x.
The display module includes a plurality of data lines 30 extending in a first direction x, and one ends of the data lines 30 are coupled to the data voltage terminals 21. The data line 30 is schematically shown in fig. 2 as being coupled to the data voltage terminal 21 through a connection lead located in the first non-display area BA 1. In some embodiments, a demultiplexer is disposed in the first non-display area BA1, an input terminal of the demultiplexer is coupled to one data voltage terminal 21, and an output terminal of the demultiplexer is coupled to at least two data lines 30, so that the number of the voltage terminals 20 can be reduced.
In addition, the display module includes a driving chip, and the driving chip is used for driving the display area AA to display. In some embodiments, the driving chip is connected to the voltage terminal 20 in a binding manner, i.e., the driving chip is bound to the first non-display area BA1. In other embodiments, the voltage terminals 20 are tied to a flexible circuit board on which the driver chip is mounted.
As shown in fig. 2, the data line 30 includes a first data line 31, the first data line 31 includes a first site W1 and a second site W2, and the first site W1 is spaced from the data voltage terminal 21 by a distance smaller than the second site W2 is spaced from the data voltage terminal 21. That is, the first and second sites W1 and W2 are two sites on the same data line 30 at different distances from the data voltage terminal 21. In other words, the distance of the first site W1 from the first non-display area BA1 is smaller than the distance of the second site W2 from the first non-display area BA1 in the first direction x.
The display module comprises a data voltage compensation module 40, wherein the data voltage compensation module 40 is used for generating a compensation voltage, and the compensation voltage is used for compensating voltage drop when at least part of the data voltage is transmitted on the data line 30; the data voltage compensation module 40 includes at least one subtractor 41, a first input terminal of the subtractor 41 is coupled to the first location W1, a second input terminal of the subtractor 41 is coupled to the second location W2, and an output terminal of the subtractor 41 is configured to output a voltage difference between the first location W1 and the second location W2. The number and specific structure of the subtracter 41 are not limited in the embodiment of the present invention, and the subtracter 41 may be any circuit capable of performing a difference operation on the voltage between the first input terminal and the second input terminal.
The second point W2 on the first data line 31 is located at an end of the first point W1 away from the data voltage terminal 21, so that when a data voltage corresponding to a gray level is transmitted on the first data line 30, the subtractor 41 can be used to detect a voltage difference between the first point W1 and the second point W2, that is, a voltage drop generated between the first point W1 and the second point W2 during the data voltage transmission can be obtained. The first data line 31 is used to collect voltage drop data of data voltages corresponding to different gray scales between the first site W1 and the second site W2, and the voltage drop data of the data voltages can be used to perform targeted compensation on the data voltages transmitted by each data line 30.
The display module provided in the embodiment of the invention is provided with a data voltage compensation module 40, the data voltage compensation module 40 includes a subtracter 41, when the data voltage is transmitted on the first data line 31, the subtracter 41 can detect the voltage difference between the first site W1 and the second site W2, and the voltage difference between the first site W1 and the second site W2 can represent the voltage drop generated during the data voltage transmission. The data voltage compensation module 40 can generate a compensation voltage according to the voltage difference between the first site W1 and the second site W2, and compensate the data voltage corresponding to the display area defined by the first site W1 and the second site W2 by using the compensation voltage, so as to compensate the voltage drop of at least part of the data voltage when the data voltage is transmitted on the data line 30 by using the compensation voltage, and reduce the influence of the voltage drop of the data voltage on the light-emitting current. After the data voltage is compensated by the compensation voltage, the actual brightness of the light emitting device 10 at a position far from the data voltage terminal 21 relative to the first locus W1 can also be close to the brightness of the light emitting device 10 near the first locus W1, and the brightness difference between the light emitting devices 10 in the display area defined by the first locus W1 and the second locus W2 is reduced, so that the problem of uneven display is improved, and the overall display effect is improved.
Among them, the display area defined for the first and second sites W1 and W2 can be understood as follows. As shown in fig. 2, taking the first direction x as a longitudinal direction and the second direction y as a transverse direction, the second direction y is perpendicular to the first direction x, and the display area AA has a certain width in both the first direction x and the second direction y. The display area defined by the first locus W1 and the second locus W2 includes at least a display area between a first virtual straight line X1 passing through the first locus X1 and a second virtual straight line X2 passing through the second locus W2, and the first virtual straight line X1 and the second virtual straight line X2 are parallel to the second direction y. In some embodiments, the light emitting device 10 is not included in a portion of the display area between the first virtual straight line X1 and the first non-display area BA1, and the portion of the display area between the first virtual straight line X1 and the first non-display area BA1 may be divided into the display area defined by the first and second sites W1 and W2. In other embodiments, the light emitting device 10 is included in a portion of the display area between the second virtual straight line X2 and the second non-display area BA2, and the display area defined by the first site W1 and the second site W2 may further include a portion of the display area between the second virtual straight line X2 and the second non-display area BA 2.
Note that, in fig. 2, the position of the subtractor 41 in the non-display area BA is only schematically shown. In some embodiments, the subtractor 41 is located in a non-display region on one side of the display region AA in the second direction y. In other embodiments, the subtracter 41 is located in the first non-display area BA1, so that the subtracter 41 does not occupy the space of the non-display area on both sides of the display area AA in the second direction y.
The embodiment of the invention also provides a driving method of a display module, which is used for driving the display module provided by any embodiment of the invention, and fig. 3 is a flowchart of a driving method of a display module provided by the embodiment of the invention, as shown in fig. 3, the driving method includes:
step S101: at least part of the display area defined by the first site W1 and the second site W2 is divided into n compensation areas arranged in the first direction x, n is a positive integer, and n is more than or equal to 1. The driving method provided by the embodiment of the present invention is understood in conjunction with the manner of dividing the display area AA in fig. 2. In the embodiment of fig. 2, the light emitting device 10 is not included between the first site W1 and the first non-display area BA1, the light emitting device 10 is not included between the second virtual straight line X2 and the second non-display area BA2, and the display areas between the first virtual straight line X1 and the second non-display area BA2 are all compensation areas. That is, in the embodiment of FIG. 2, the display area AA is divided into the compensation area Z by illustrating that the area defined by the first site W1 and the second site W2 is substantially the whole display area AA 1 Compensation zone Z 2 Compensation zone Z 3 To compensation zone Z n-1 Compensation zone Z n N compensation regions in total. The arrangement direction of the compensation regions is the same as the extending direction of the data lines 30.
Step S102: in the display stage, the voltage drops of the data voltages corresponding to the n compensation regions are respectively compensated for by using the compensation voltages when the data voltages are transmitted on the data lines 30.
In the embodiment of the present invention, a voltage drop occurs between the first location W1 and the second location W2 when the data voltage is transmitted on the first data line 31, and the subtractor 41 can detect the voltage difference between the first location W1 and the second location W2, so that the voltage drop between the first location W1 and the second location W2 can be obtained. The data voltage compensation module 40 generates a corresponding compensation voltage according to the voltage difference between the first site W1 and the second site W2, then uses the compensation voltage to conduct targeted compensation on the voltage drop of the data voltage corresponding to each divided compensation area, and reduces the brightness difference between the light emitting devices 10 in the display area defined by the first site W1 and the second site W2 after the data voltage is compensated by using the compensation voltage, thereby improving the uneven display problem and the overall display effect.
In some embodiments, step S102 compensates for a voltage drop of the data voltages corresponding to the n compensation regions during transmission on the data line 30 by using the compensation voltages, including: and controlling the compensation voltage gradient increase corresponding to the n compensation areas respectively in the direction from the first site W1 to the second site W2. I.e. compensating zone Z in the order of arrangement as shown in FIG. 2 1 Compensation zone Z 2 Compensation zone Z 3 … to compensation zone Z n-1 Compensation zone Z n Their respective compensation voltage gradients increase. With the driving method provided in this embodiment, the compensation zone Z is set 2 The corresponding compensation voltage is greater than the compensation zone Z 1 Corresponding compensation voltage, compensation zone Z 3 The corresponding compensation voltage is larger than the compensation zone Z 2 The corresponding compensation voltages are similarly set for the compensation voltages corresponding to the compensation areas.
To compensate zone Z 1 And compensation zone Z 2 For example, compared to compensation zone Z 1 Compensation zone Z 2 Further from the first non-display area BA1, i.e. the compensation area Z 2 Further from the data voltage terminal 21, and the further the data voltage is transmitted on the data line 30, the greater the voltage drop is generated. Then for the same data voltage the compensation zone Z 2 The voltage drop of the data voltage received by the pixel circuit in the pixel circuit is larger than the compensation zone Z 1 Voltage drop of data voltages received by the pixel circuits within. Thereby setting the compensation zone Z 2 The corresponding compensation voltage is greater than the compensation zone Z 1 The corresponding compensation voltage realizes the targeted setting of the compensation voltage corresponding to the compensation area according to the distance between the compensation area and the data voltage terminal 21. In the data circuit using compensation voltageAfter the compensation is performed, the actual brightness of the light emitting device in each compensation zone is made substantially close to the desired brightness. The brightness difference of each light emitting device 10 in the display area defined by the first site W1 and the second site W2 can be reduced, so that the brightness of each light emitting device is basically the same, the problem of uneven display is solved, and the overall display effect is improved.
In some embodiments, fig. 4 is a schematic diagram of another display module according to an embodiment of the present invention, as shown in fig. 4, the data voltage compensation module 40 further includes a compensation analysis module 42; the compensation analysis module 42 is coupled to the output of the subtractor 41, and the compensation analysis module 42 is configured to collect the voltage difference fed back by the output of the subtractor 41 and generate a compensation voltage according to the voltage difference using a compensation rule. Optionally, the maximum value of the compensation voltage is equal to the voltage difference between the first site W1 and the second site W2; wherein the compensation rule includes: dividing at least part of the display area defined by the first locus W1 and the second locus W2 into n compensation areas arranged in the first direction x, wherein n is a positive integer, and n is more than or equal to 1; in the direction from the first site W1 to the second site W2, n compensation regions are provided, respectively corresponding to the compensation voltage gradient increases.
An alternative compensation rule employed by the present invention is illustrated below. In one embodiment, the first data line 31 transmits a data voltage corresponding to a gray level, and the subtractor 41 detects that the voltage difference between the first location W1 and the second location W2 is Δv. When dividing the display area defined by the first site W1 and the second site W2, equal length division of each compensation area in the first direction x is performed, that is, the lengths of n compensation areas in the first direction x are set to be substantially equal. According to the rule that the compensation voltage gradients corresponding to the n compensation areas respectively increase in the direction from the first site W1 to the second site W2, optionally, the compensation voltages corresponding to the n compensation areas are increased in equal proportion. Then set the compensation zone Z 1 The corresponding compensation voltage isCompensation zone Z 2 The corresponding compensation voltage is +.>It will be appreciated that the compensation zone Z n The corresponding compensation voltage is DeltaV. In the embodiment of the invention, the larger the value of n is, the finer the division of the compensation areas is, the finer the compensation voltage corresponding to each compensation area is, and the better the effect of improving the display unevenness is.
In the embodiment of the invention, the compensation rule is related to the division rule of the compensation area, and the compensation voltage corresponding to each compensation area is set according to the division rule of the compensation area. In some embodiments, the display area defined by the first site W1 and the second site W2 may also be divided into non-equal length in the first direction x.
In some embodiments, the display module includes a substrate on which both the subtractor 41 and the compensation analysis module 42 are fabricated.
In other embodiments, the subtractor 41 is fabricated on the substrate, the output end of the subtractor 41 is coupled to a voltage terminal 20, and the compensation analysis module 42 is integrated in the driving chip, and the subtractor 41 is coupled to the compensation analysis module 42 integrated in the driving chip through the voltage terminal 20.
In some implementations, the driving method provided by the embodiment of the present invention further includes step S200: the control data voltage compensation module 40 operates to generate a compensation voltage; the step S200 specifically includes:
step S201: collecting voltage differences between the first site W1 and the second site W2 when the first data line 31 transmits different gray scale voltages, and generating a voltage difference library table according to the voltage differences; the gray scale voltages are preset data voltages corresponding to the gray scales, and the gray scales and the voltage differences are in one-to-one correspondence in a voltage difference library table. FIG. 5 is a schematic diagram showing the voltage difference library according to the embodiment of the present invention, wherein the gray levels in the voltage difference library table correspond to the voltage differences delta one by one, and the voltage differences corresponding to the gray levels in the table are only shown by symbols, for example, when the voltage difference between the first site W1 and the second site W2 is C when the voltage difference is 0 gray level 0 。
Step S202: generating a compensation voltage library table according to the voltage difference library table, wherein each gray scale in the compensation voltage library table corresponds to n respectivelyThe n compensation voltages are in one-to-one correspondence with the n compensation areas. FIG. 6 is a schematic diagram of a compensation voltage library according to an embodiment of the present invention, wherein the compensation voltages corresponding to the compensation regions in FIG. 6 are only shown with symbols. Such as for a 0 gray scale: compensation zone Z 1 The corresponding compensation voltage is D 0-1 Compensation zone Z 2 The corresponding compensation voltage is D 0-2 Compensation zone Z n The corresponding compensation voltage is D 0-n . And for compensation zone Z 1 : the compensation voltage corresponding to 1 gray scale is D 1-1 The compensation voltage corresponding to the 254 gray level is D 254-1 The compensation voltage corresponding to 255 gray scales is D 255-1 。
In order to meet the color display requirements of the display module, each light emitting device 10 needs to be capable of multi-gray scale display. For example, the conventional light emitting device 10 in the prior art can display 0 to 255 gray scales, and each gray scale corresponds to a respective preset data voltage. By adopting the driving method provided by the embodiment of the invention, the preset data voltage corresponding to the 0 gray scale is provided on the first data line 31, and then the subtracter 41 is utilized to collect the voltage difference between the first site W1 and the second site W2 corresponding to the 0 gray scale; providing a preset data voltage corresponding to 1 gray scale on the first data line 31, and then using the subtracter 41 to collect a voltage difference between the first site W1 and the second site W2 corresponding to 1 gray scale; that is, the subtracter 41 can collect the voltage differences between the first and second sites W1 and W2 corresponding to the gray scales of 0 to 255, respectively, to obtain the voltage difference library table. Then, according to a rule of dividing a display area defined by the first locus W1 and the second locus W2, n compensation voltages respectively corresponding to the n compensation voltages in the direction from the first locus W1 to the second locus W2 are set. And for one gray level, each compensation voltage is respectively corresponding to each compensation voltage, so as to generate a compensation voltage library table. The embodiment of the invention provides a generation method of compensation voltage, which can compensate the corresponding data voltage when each compensation area displays different gray scales according to the requirements.
Further, the compensation voltage is used to compensate the voltage drop of the data voltages corresponding to the n compensation areas when the data voltages are transmitted on the data line 30, and the method includes: searching a corresponding compensation voltage in the data voltage compensation module 40 according to the preset data voltage to generate a compensated data voltage, wherein the preset data voltage corresponds to gray scale information and position information, and the compensated data voltage is the sum of the preset data voltage and the compensation voltage; control provides the compensated data voltage to the data line 30.
For a frame of the picture to be displayed, it includes display data information, and the display data information includes gray-scale information of each light emitting device 10 in the display area AA, and position information of the light emitting device 10 in the display area AA. The preset data voltage according to the embodiment of the present invention may be understood as a data voltage before compensation, that is, a data voltage included in display data information. The preset data voltage corresponds to gray scale information; the preset data voltages are in one-to-one correspondence with the light emitting devices 10, and the preset data voltages also correspond to position information of the positions of the light emitting devices 10. In the embodiment of the present invention, the display area defined by the first site W1 and the second site W2 is divided, and then it can be determined whether the light emitting device 10 is located in the compensation area, and in particular, which compensation area, according to the position information of the light emitting device 10. It is thus possible to select a corresponding compensation voltage according to the gray scale of the light emitting device 10 and the position thereof, and to generate a compensated data voltage. The compensated data voltage is supplied to the data line 30 to drive the corresponding light emitting device 10 to emit light using the compensated data voltage. Compensating for the voltage drop of at least part of the data voltages on the data lines 30 with the compensation voltage is achieved to improve the display non-uniformity problem.
In some embodiments, fig. 7 is a block diagram of another display module according to an embodiment of the present disclosure. As shown in fig. 7, the compensation analysis module 42 in the data voltage compensation module 40 includes an acquisition module 421 and an operation module 422. The collection module 421 is coupled to the output end of the subtractor 41, and the collection module 421 is configured to collect the voltage differences between the first site W1 and the second site W2 when the first data line 31 transmits different gray voltages, and generate a voltage difference library table according to the voltage differences; the gray scale voltages are preset data voltages corresponding to the gray scales, and the gray scales and the voltage differences in the voltage difference library table are in one-to-one correspondence. The operation module 422 is coupled to the collection module 421, and the operation module 422 is configured to generate a compensation voltage library table according to the voltage difference library table by using a compensation rule, where each gray level in the compensation voltage library table corresponds to n compensation voltages, and the n compensation voltages are in one-to-one correspondence with the n compensation regions. The display module provided by the embodiment of the invention can compensate the data voltage corresponding to each compensation area when displaying different gray scales according to the requirement, and reduces the brightness difference of the light emitting devices 10 in the display area defined by the first site W1 and the second site W2 in the display stage, thereby improving the problem of uneven display and enhancing the overall display effect.
In some embodiments, the compensation voltage library table is burned into the data voltage compensation module 40 before the display module leaves the factory. And directly calling a compensation voltage library table to compensate the data voltage in a display stage in a subsequent application.
In one embodiment, fig. 8 is a block diagram of another display module according to an embodiment of the present invention. As shown in fig. 8, the display module further includes a data control module 50; the data control module 50 is coupled to the data voltage compensation module 40, and the data control module 50 is configured to search a corresponding compensation voltage in the data voltage compensation module 40 according to a preset data voltage to generate a compensated data voltage, and provide the compensated data voltage to the data line 30 in a display stage; the preset data voltage corresponds to gray level information and position information, and the compensated data voltage is the sum of the preset data voltage and the compensated voltage. The data control module 50 is coupled to the data voltage terminals, and the data control module 50 provides the compensated data voltage to each data line 30 through the data voltage terminals.
In some embodiments, fig. 9 is a block diagram of another display module according to an embodiment of the present invention. As shown in fig. 9, the display module further includes a calibration module 60, the calibration module 60 is coupled to the data voltage compensation module 40, and the calibration module 60 is configured to send a calibration command to the data voltage compensation module 40; the data voltage compensation module 40 operates in response to the calibration command to generate a current compensation voltage and replaces the historical compensation voltage with the current compensation voltage to compensate for a voltage drop of at least a portion of the data voltage as it is transmitted over the data line.
The calibration module 60 is used to control the data voltage compensation module 40 to update the compensation voltage in this embodiment. The data voltage compensation module 40 works under the control of the calibration module 60 to provide gray scale voltages to the first data line 31, and the control subtracter 41 obtains the voltage differences between the first site W1 and the second site W2, so that voltage differences corresponding to 0-255 gray scales can be obtained respectively, and a voltage difference library table is obtained after summarizing, wherein the gray scales and the voltage differences correspond to each other one by one. And then, generating a compensation voltage library table by using the voltage difference library table according to a compensation rule, wherein each gray scale in the compensation voltage library table corresponds to n compensation voltages, and the n compensation voltages correspond to the n compensation areas one by one. And replacing the history compensation voltage library table with the newly generated compensation voltage library table, thereby realizing the replacement of the current compensation voltage with the history compensation voltage. In a subsequent display phase, the voltage drop of at least part of the data voltage as it is transmitted over the data line is compensated for using the present compensation voltage. According to the embodiment, the compensation voltage can be calibrated after the display module is applied for a period of time, so that the effect of improving the display unevenness can be achieved after the display module is used for a period of time.
In some embodiments, as shown in fig. 2, a first input of the subtractor 41 is coupled to the first location W1 through a first connection line L1, and a second input of the subtractor 41 is coupled to the second location W2 through a second connection line L2; wherein the impedance of the first connection line L1 is the same as the impedance of the second connection line L2. The subtracter 41 detects the voltage difference between the first input terminal and the second input terminal thereof, and the voltage difference between the first input terminal and the second input terminal can represent the voltage difference between the first site W1 and the second site W2, and setting the impedance of the first connecting line L1 to be the same as the impedance of the second connecting line L2 can ensure the accuracy of the voltage difference between the first site W1 and the second site W2 detected by the subtracter 41.
In some embodiments, fig. 10 is a schematic diagram of another display module according to an embodiment of the invention, as shown in fig. 10, a display area AA includes a plurality of light emitting devices 10, and one data line 30 is coupled to the plurality of light emitting devices 10. In the first direction x, the number of light emitting devices 10 spaced between the first site W1 and the first non-display area BA1 is n1, n1=0. In the first direction x, the number of light emitting devices 10 spaced between the second dot W2 and the second non-display area BA2 is n2, n2=0. In this embodiment, the display area defined by the first site W1 and the second site W2 is substantially the entire display area AA. When the data voltage is transmitted on the first data line 31, the subtractor 41 can detect the voltage difference between the first point W1 and the second point W2, and the voltage difference between the first point W1 and the second point W2 is a voltage drop generated between the first point W1 and the second point W2. And generating n compensation voltages respectively corresponding to the compensation points according to the compensation rule by utilizing the voltage difference between the first position point W1 and the second position point W2. In the display stage, the voltage drop of the data voltages corresponding to the n compensation areas during transmission on the data line 30 is compensated by using the compensation voltages, so that the brightness difference of each light emitting device 10 in the whole display area AA can be reduced, and the display non-uniformity problem can be improved.
In other embodiments, fig. 11 is a schematic diagram of another display module according to an embodiment of the present invention, as shown in fig. 11, in a first direction x, 10 light emitting devices spaced between a first site W1 and a first non-display area BA1 are n1, n1 is an integer, and n1>0. In the first direction x, the number of light emitting devices 10 spaced between the second dot W2 and the second non-display area BA2 is n2, n2=0. This embodiment can compensate for the display area portion of the first virtual straight line X1 on the side away from the first non-display area BA 1.
In other embodiments, fig. 12 is a schematic diagram of another display module according to an embodiment of the present invention, as shown in fig. 12, in a first direction x, 10 light emitting devices spaced between a first site W1 and a first non-display area BA1 are n1, where n1=0. In the first direction x, the number of light emitting devices 10 spaced between the second bit W2 and the second non-display area BA2 is n2, n2 is an integer, and n2>0. The embodiment of fig. 12 enables compensation of the entire display area by setting the display area defined by the first and second sites W1 and W2 to include the display area between the second virtual straight line X2 and the second non-display area BA 2. The embodiment of fig. 12 enables compensation of a portion of the display area between the second virtual straight line X2 and the first non-display area BA1 by setting the display area defined by the first locus W1 and the second locus W2 to not include the display area between the second virtual straight line X2 and the second non-display area BA 2.
In other embodiments, the number of light emitting devices 10 spaced between the first site W1 and the first non-display area BA1 in the first direction x is n1, n1 is an integer, and n1>0. In the first direction x, the number of light emitting devices 10 spaced between the second bit W2 and the second non-display area BA2 is n2, n2 is an integer, and n2>0. Compensation of the local display area can be achieved.
In other embodiments, fig. 13 is a schematic diagram of another display module according to an embodiment of the present invention, where, as shown in fig. 13, the display module includes a display area AA and a non-display area BA; the non-display area BA includes a first non-display area BA1, the first non-display area BA1 including a plurality of voltage terminals 20, the voltage terminals 20 including a power supply voltage terminal 22. The display panel comprises a power line 70 extending in a first direction x, and one end of the power line 70 is coupled to the power voltage terminal 22; the power line includes a first power line 71, the first power line 71 including a third locus W3 and a fourth locus W4, the third locus W3 being a distance from the power voltage terminal 22 less than a distance of the fourth locus W4 from the power voltage terminal 22. Wherein the power line 70 is a positive power voltage line, and the power line 70 is used for providing a light emitting current id=k (Pvdd-Vdata) 2 In (2) a Pvdd signal.
The display module comprises a power supply voltage compensation module 08, wherein the power supply circuit compensation module 08 is used for compensating voltage drop of a transmission power supply voltage signal on at least part of a line segment of the power supply line 70; the power supply voltage compensation module 08 includes at least one feedback circuit 80, where the feedback circuit 80 includes a first input terminal, a second input terminal, and an output terminal, the output terminal of the feedback circuit 80 is coupled to the second input terminal, and the feedback circuit 80 is configured to control the voltage at the second input terminal and the voltage at the first input terminal to be equal. In the embodiment of the present invention, the specific structure of the feedback circuit 80 is not limited, the feedback circuit 80 can be used for comparing the magnitudes of the signals of the two input ends and controlling the output ends, and when the voltages of the first input end and the second input end are unequal, the feedback circuit 80 is started to control the voltages of the second input end and the first input end to be equal.
As shown in fig. 13, the feedback circuit 80 includes a first feedback circuit 81, a first input terminal of the first feedback circuit 81 is coupled to the third site W3, a second input terminal of the first feedback circuit 81 is coupled to the fourth site W4, and an output terminal of the first feedback circuit 81 is coupled to the second input terminal thereof.
The first power line 71 transmits the power voltage, and the fourth site W4 is farther from the power voltage terminal 22 than the third site W3, there is a voltage drop between the fourth site W4 and the third site W3. When the voltage at the fourth site W4 is different from the voltage at the third site W3, the first feedback circuit 81 can detect that the voltages at the first input terminal and the second input terminal are different, and make feedback control to equalize the voltages at the first input terminal and the second input terminal, thereby equalizing the voltage at the fourth site W4 and the voltage at the third site W3, and realizing that the voltage drop of the power supply voltage on the power supply line is compensated by the feedback circuit 80. It is possible to make the power supply voltage received by the pixel circuit at a position farther from the power supply voltage terminal 22 and the power supply voltage received by the pixel circuit at a position closer to the power supply voltage terminal 22 coincide. In view of combining a luminous current formula, the embodiment of the invention can reduce the influence of the difference of the power supply voltage Pvdd on the luminous current Id and improve the display uniformity.
In some embodiments, as shown in fig. 13, a power bus 07 is provided in the first non-display area BA1, and the power bus 07 is coupled to the power voltage terminal 22, that is, the power line 70 is coupled to the power voltage terminal 22 through the power bus 07.
In some embodiments, as shown in fig. 13, the first input terminal of the first feedback circuit 81 is coupled to the third site W3 through the third connection line L3, and the second input terminal of the first feedback circuit 81 is coupled to the fourth site W4 through the fourth connection line L4; the impedance of the third connection line L3 is equal to the impedance of the fourth connection line L4. This arrangement ensures that the voltage difference between the first input terminal and the second input terminal of the first feedback circuit 81 can accurately reflect the voltage difference between the third site W3 and the fourth site W4.
In some embodiments, fig. 14 is a schematic diagram of another display module according to an embodiment of the present invention, as shown in fig. 14, the display module further includes a plurality of second power lines 90, where the second power lines 90 extend in a second direction y, and the second direction y intersects the first direction x. The second power line 90 and the power line 70 are cross-coupled to form a grid structure, and the second power line 90 can reduce the voltage drop of the transmission power voltage, thereby reducing the overall power consumption.
In other embodiments, fig. 15 is a schematic diagram of another display module provided in the embodiment of the present invention, as shown in fig. 15, the first power line 71 further includes a fifth location W5, and a distance between the fifth location W5 and the power voltage terminal 22 is greater than a distance between the fourth location W4 and the power voltage terminal 22; the feedback circuit 80 includes a second feedback circuit 82, a first input terminal of the second feedback circuit 82 is coupled to the third site W3, and a second input terminal of the second feedback circuit 82 is coupled to the fifth site W5. In this embodiment, the second feedback circuit 82 is provided, and when the voltages at the fifth locus W5 and the third locus W3 are different, the second feedback circuit 82 can detect that the voltages at the first input terminal and the second input terminal thereof are different, and make feedback control such that the voltages at the first input terminal and the second input terminal thereof are equal, whereby the voltage at the fifth locus W5 and the voltage at the third locus W3 can be made equal. The voltages at the third site W3, the fourth site W4 and the fifth site W5 on the first power line 71 can be substantially the same, so that voltage drops at a plurality of sites on the power line can be compensated by using the two feedback circuits 80, so that the power supply voltage received by the pixel circuit at a position far from the power supply voltage terminal 22 and the power supply voltage received by the pixel circuit at a position near to the power supply voltage terminal 22 can be kept consistent, and the display uniformity is improved.
In fig. 15, two feedback circuits 80 are illustrated for the first power line 71, and in some embodiments, one first power line 71 may correspond to three or more feedback circuits 80, with a first input terminal of each feedback circuit 80 coupled to a third location W3, and a second input terminal of each feedback circuit 80 coupled to a different location further from the power voltage terminal 22. The figures are not illustrated here.
In other embodiments, fig. 16 is a schematic diagram of another display module provided in the embodiment of the present invention, as shown in fig. 16, the first power line 71 further includes a sixth site W6 and a seventh site W7, and a distance between the sixth site W6 and the power voltage terminal 22 is smaller than a distance between the seventh site W7 and the power voltage terminal 22; the feedback circuit 80 includes a third feedback circuit 83, a first input terminal of the third feedback circuit 83 is coupled to the sixth point W6, and a second input terminal of the third feedback circuit 83 is coupled to the seventh point W7. In this embodiment, the third feedback circuit 83 is provided, and when the voltages at the sixth site W6 and the seventh site W7 are different, the third feedback circuit 83 can detect that the voltages at the first input terminal and the second input terminal thereof are different, and make feedback control such that the voltages at the first input terminal and the second input terminal thereof are equal, whereby the voltage at the sixth site W6 and the voltage at the seventh site W7 can be made equal. In this embodiment, the voltages at the third site W3 and the fourth site W4 on the first power line 71 are substantially the same through the feedback control of the first feedback circuit 81, and the voltages at the sixth site W6 and the seventh site W7 are substantially the same through the control of the third feedback circuit 83, so that the voltage drops at different line segment positions on the power line are respectively compensated by using the two feedback circuits 80. The power supply voltage received by the pixel circuit at a position farther from the power supply voltage terminal 22 and the power supply voltage received by the pixel circuit at a position closer to the power supply voltage terminal 22 can be kept identical, and the display uniformity can be improved.
In some embodiments, the fourth site W4 is multiplexed to the sixth site W6, that is, the fourth site W4 and the sixth site W6 are the same position point on the first power line 71. In other embodiments, the fourth site W4 and the sixth site W6 are different sites at different locations on the first power line 71.
In fig. 16, two feedback circuits 80 are illustrated for the first power line 71, in some embodiments, one first power line 71 may correspond to three or more feedback circuits 80, each feedback circuit 80 corresponds to a different line segment on the first power line 71, and each feedback circuit 80 compensates for a voltage drop on its corresponding line segment. The figures are not illustrated here.
In other embodiments, fig. 17 is a schematic diagram of another display module according to an embodiment of the invention, as shown in fig. 17, the display module further includes a second power line 90 extending in the second direction y, and the first power line 71 is coupled to the second power line 90. The second power line 90 includes an eighth site W8 and a ninth site W9. The feedback circuit 80 includes a fourth feedback circuit 84, a first input terminal of the fourth feedback circuit 84 is coupled to the eighth site W8, and a second input terminal of the fourth feedback circuit 84 is coupled to the ninth site W9. In this embodiment, the extending direction of the second power line 90 is different from the extending direction of the first power line 71, and a certain voltage drop occurs when the power voltage is transmitted through the second power line 90. The voltage at the eighth site W8 and the voltage at the ninth site W9 can be kept consistent by the arrangement of the fourth feedback circuit 84, so as to compensate the voltage drop on the second power line 90, and further improve the display uniformity.
Fig. 18 is a schematic diagram of a display device according to an embodiment of the present invention, and as shown in fig. 18, the display device includes a display module 100 according to any embodiment of the present invention. The structure of the display module 100 is already described in the above embodiments, and will not be described herein. The display device provided by the embodiment of the invention is any device with a display function, such as a mobile phone, a tablet computer, a notebook computer, an electronic paper book, a television, a smart watch and the like.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the invention.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims (18)

1. The display module is characterized by comprising a display area and a non-display area; the non-display area comprises a first non-display area which is positioned on one side of the display area in a first direction, the first non-display area comprises a plurality of voltage terminals, and the voltage terminals comprise data voltage terminals;
the display module comprises a plurality of data lines extending in the first direction, and one ends of the data lines are coupled with the data voltage terminals; the data line comprises a first data line, the first data line comprises a first locus and a second locus, and the distance from the first locus to the data voltage terminal is smaller than the distance from the second locus to the data voltage terminal;
the display module comprises a data voltage compensation module, wherein the data voltage compensation module is used for generating a compensation voltage, and the compensation voltage is used for compensating voltage drop when at least part of data voltage is transmitted on the data line; wherein,,
the data voltage compensation module comprises at least one subtracter, wherein a first input end of the subtracter is coupled with the first locus, a second input end of the subtracter is coupled with the second locus, and an output end of the subtracter is used for outputting a voltage difference between the first locus and the second locus.
2. The display module assembly of claim 1, wherein the display module assembly comprises,
the data voltage compensation module further comprises a compensation analysis module;
the compensation analysis module is coupled with the output end of the subtracter and is used for collecting the voltage difference fed back by the output end of the subtracter and generating the compensation voltage by adopting a compensation rule according to the voltage difference; wherein,,
the compensation rule includes: dividing at least part of the display area defined by the first locus and the second locus into n compensation areas arranged in the first direction, wherein n is a positive integer, and n is more than or equal to 1; and setting n compensation voltage gradient increases corresponding to the compensation areas respectively in the direction from the first locus to the second locus.
3. The display module assembly of claim 2, wherein the display module assembly comprises,
the compensation analysis module comprises an acquisition module and an operation module;
the acquisition module is coupled with the output end of the subtracter and is used for acquiring the voltage difference between the first position point and the second position point when the first data line transmits different gray scale voltages and generating a voltage difference library table according to the voltage difference; the gray scale voltages are preset data voltages corresponding to gray scales, and the gray scales and the voltage differences in the voltage difference library table correspond to each other one by one;
The operation module is coupled with the acquisition module and is used for generating a compensation voltage library table according to the voltage difference library table by adopting the compensation rule, each gray level in the compensation voltage library table corresponds to n compensation voltages respectively, and the n compensation voltages correspond to the n compensation areas one by one.
4. The display module assembly of claim 1, wherein the display module assembly comprises,
the display module further comprises a data control module;
the data control module is coupled with the data voltage compensation module, and is used for searching the corresponding compensation voltage in the data voltage compensation module according to the preset data voltage to generate a compensated data voltage, and providing the compensated data voltage for the data line in a display stage; the preset data voltage corresponds to gray level information and position information, and the compensated data voltage is the sum of the preset data voltage and the compensation voltage.
5. The display module assembly of claim 1, wherein the display module assembly comprises,
the display module further comprises a calibration module, wherein the calibration module is coupled with the data voltage compensation module and is used for sending a calibration instruction to the data voltage compensation module;
The data voltage compensation module responds to the calibration command to work to generate a current compensation voltage, and replaces the historical compensation voltage with the current compensation voltage so as to compensate the voltage drop of at least part of the data voltage when the data voltage is transmitted on the data line by using the current compensation voltage.
6. The display module assembly of claim 1, wherein the display module assembly comprises,
the first input end of the subtracter is coupled with the first site through a first connecting wire, and the second input end of the subtracter is coupled with the second site through a second connecting wire;
the impedance of the first connection line is the same as the impedance of the second connection line.
7. The display module assembly of claim 1, wherein the display module assembly comprises,
the display area comprises a plurality of light emitting devices, and one data line is coupled with the plurality of light emitting devices;
in the first direction, the number of the light emitting devices at intervals between the first sites and the first non-display area is n1, wherein n1 is more than or equal to 0, and n1 is an integer.
8. The display module assembly of claim 1, wherein the display module assembly comprises,
the display area comprises a plurality of light emitting devices, and one data line is coupled with the plurality of light emitting devices;
the non-display area comprises a second non-display area, and the second non-display area and the first non-display area are respectively positioned at two sides of the display area in the first direction;
In the first direction, the number of the light emitting devices at intervals between the second sites and the second non-display area is n2, wherein n2 is more than or equal to 0, and n2 is an integer.
9. The driving method of the display module is characterized in that the display module comprises a display area and a non-display area; the non-display region includes a first non-display region including a plurality of voltage terminals including a data voltage terminal; the display area comprises a plurality of data lines extending in a first direction, and one ends of the data lines are coupled with the data voltage terminals; the data line comprises a first data line, the first data line comprises a first locus and a second locus, and the distance from the first locus to the data voltage terminal is smaller than the distance from the second locus to the data voltage terminal;
the display module comprises a data voltage compensation module, wherein the data voltage compensation module is used for generating compensation voltage; the data voltage compensation module comprises at least one subtracter, wherein a first input end of the subtracter is coupled with the first locus, and a second input end of the subtracter is coupled with the second locus; the output end of the subtracter is used for outputting the voltage difference between the first position point and the second position point;
The driving method includes:
dividing at least part of the display area defined by the first locus and the second locus into n compensation areas arranged in the first direction, wherein n is a positive integer, and n is more than or equal to 1;
and in the display stage, adopting the compensation voltages to compensate the voltage drops of the data voltages corresponding to the n compensation areas when the data voltages are transmitted on the data lines.
10. The driving method according to claim 9, wherein,
and respectively compensating voltage drops of the data voltages corresponding to the n compensation areas when the data voltages are transmitted on the data lines by adopting the compensation voltages, wherein the method comprises the following steps:
and controlling the compensation voltage gradient increase corresponding to the n compensation areas respectively in the direction from the first locus to the second locus.
11. The driving method according to claim 9, further comprising controlling the data voltage compensation module to operate to generate the compensation voltage; wherein, include:
collecting voltage differences between the first position point and the second position point when the first data line transmits different gray scale voltages, and generating a voltage difference library table according to the voltage differences; the gray scale voltages are preset data voltages corresponding to gray scales, and the gray scales and the voltage differences in the voltage difference library table correspond to each other one by one;
Generating a compensation voltage library table according to the voltage difference library table, wherein each gray scale in the compensation voltage library table corresponds to n compensation voltages, and the n compensation voltages correspond to the n compensation areas one by one.
12. The driving method according to claim 9, wherein,
and respectively compensating voltage drops of the data voltages corresponding to the n compensation areas when the data voltages are transmitted on the data lines by adopting the compensation voltages, wherein the method comprises the following steps:
searching the corresponding compensation voltage in the data voltage compensation module according to a preset data voltage to generate a compensated data voltage, wherein the preset data voltage corresponds to gray scale information and position information, and the compensated data voltage is the sum of the preset data voltage and the compensation voltage;
and controlling to provide the compensated data voltage to the data line.
13. The display module is characterized by comprising a display area and a non-display area; the non-display region includes a first non-display region including a plurality of voltage terminals including a power supply voltage terminal;
the display module comprises a power line extending in a first direction, and one end of the power line is coupled with the power voltage terminal; the power line comprises a first power line, the first power line comprises a third locus and a fourth locus, and the distance from the third locus to the power voltage terminal is smaller than the distance from the fourth locus to the power voltage terminal;
The display module comprises a power supply voltage compensation module, wherein the power supply voltage compensation module is used for compensating voltage drop of a transmission power supply voltage signal on at least part of a line segment of the power supply line; wherein,,
the power supply voltage compensation module comprises at least one feedback circuit, wherein the feedback circuit comprises a first input end, a second input end and an output end, the output end of the feedback circuit is coupled with the second input end of the feedback circuit, and the feedback circuit is used for controlling the voltage of the second input end of the feedback circuit to be equal to the voltage of the first input end of the feedback circuit; the feedback circuit comprises a first feedback circuit, wherein a first input end of the first feedback circuit is coupled with the third site, and a second input end of the first feedback circuit is coupled with the fourth site.
14. The display module assembly of claim 13, wherein the display module assembly comprises,
the first input end of the first feedback circuit is coupled with the third site through a third connecting wire, and the second input end of the first feedback circuit is coupled with the fourth site through a fourth connecting wire;
the impedance of the third connecting wire is equal to the impedance of the fourth connecting wire.
15. The display module assembly of claim 13, wherein the display module assembly comprises,
The first power line further includes a fifth location having a distance from the power supply voltage terminal that is greater than a distance from the fourth location to the power supply voltage terminal;
the feedback circuit comprises a second feedback circuit, wherein a first input end of the second feedback circuit is coupled with the third site, and a second input end of the second feedback circuit is coupled with the fifth site.
16. The display module assembly of claim 13, wherein the display module assembly comprises,
the first power line further comprises a sixth position and a seventh position, wherein the distance from the sixth position to the power voltage terminal is smaller than the distance from the seventh position to the power voltage terminal;
the feedback circuit comprises a third feedback circuit, wherein a first input end of the third feedback circuit is coupled with the sixth site, and a second input end of the third feedback circuit is coupled with the seventh site.
17. The display module assembly of claim 13, wherein the display module assembly comprises,
the display module further comprises a second power line extending in a second direction, and the second direction is intersected with the first direction; the second power line comprises an eighth site and a ninth site;
the feedback circuit comprises a fourth feedback circuit, wherein a first input end of the fourth feedback circuit is coupled with the eighth site, and a second input end of the fourth feedback circuit is coupled with the ninth site.
18. A display device comprising the display module of any one of claims 1 to 8, 13 to 17.
CN202210245264.8A 2022-03-14 2022-03-14 Display module, driving method thereof and display device Active CN114613318B (en)

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