CN111028777B - Display device and control method thereof - Google Patents
Display device and control method thereof Download PDFInfo
- Publication number
- CN111028777B CN111028777B CN201911411393.4A CN201911411393A CN111028777B CN 111028777 B CN111028777 B CN 111028777B CN 201911411393 A CN201911411393 A CN 201911411393A CN 111028777 B CN111028777 B CN 111028777B
- Authority
- CN
- China
- Prior art keywords
- detection
- power supply
- voltage
- sub
- supply voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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]
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/12—Test circuits or failure detection circuits included in a display system, as permanent part thereof
Abstract
The invention provides a display device and a control method thereof.A plurality of detection points are arranged on a power supply voltage wiring, each detection point is electrically connected to a detection module through a voltage detection circuit, and further, when a switch unit in the voltage detection circuit is started, the power supply voltage at the detection point can be transmitted to the detection module through the voltage detection line, thereby achieving the purpose of detecting the power supply voltage at the detection point. Meanwhile, the voltage detection circuit provided by the invention can carry out cyclic detection on the power supply voltage of the power supply voltage wiring at all detection points, and the pre-charging voltage circuit carries out pre-charging voltage on the voltage detection line before cyclic detection every time, so that the condition that the voltage of the detection line is reduced along with the time change in the initial time of cyclic detection every time, the power supply voltage at a plurality of detection points which are detected firstly cannot be timely and accurately transmitted to the detection module can be avoided, and the purpose of accurately detecting the power supply voltage at each detection point is achieved.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display device and a control method thereof.
Background
With the development of display technology, organic light emitting display devices have been widely used in various electronic apparatuses. The organic light emitting display device has many advantages of self-luminescence, low driving voltage, high luminous efficiency, short response time, high definition and contrast, wide temperature range of use, and capability of realizing flexible display and large-area full color display, and is considered as the display device having the most potential for development nowadays.
Organic light emitting display devices can be classified into two broad categories, passive driving and active driving, according to driving methods. Among them, the organic light emitting display device of the active driving type is also called an active matrix organic light emitting display device, and light emission of the display device needs to include two power supply signals, which are a power supply voltage signal and a low potential signal. Wherein a power supply voltage wiring for supplying a power supply voltage signal is electrically connected to the plurality of pixel circuits so as to supply the power supply voltage signal to the pixel circuits of the display region. However, the power voltage wiring is affected by voltage drop, crosstalk, and other factors, so that the power voltages output by the power voltage wiring in different regions are different, and the pixel display effect is affected, and therefore, the detection of the power voltage on the power voltage wiring is particularly important.
Disclosure of Invention
In view of this, the present invention provides a display device and a control method thereof, which effectively solve the technical problems in the prior art and can accurately detect the power voltage at each detection point.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a display device, comprising:
the pixel array comprises a power supply voltage wiring, a plurality of scanning control lines and a plurality of data lines, wherein the scanning control lines and the data lines are crossed to limit a pixel unit array;
the voltage detection circuit comprises a voltage detection line and a plurality of switch units, wherein the voltage detection line is electrically connected with a power supply voltage wiring at a detection point through one switch unit;
the pre-charging circuit is electrically connected with the voltage detection line and is used for controlling the voltage detection line to be connected with reference voltage;
and the detection module is electrically connected with the voltage detection line and is used for detecting the power supply voltage of the access detection point of the voltage detection line.
Optionally, each of the detection points includes a first sub-detection point and a second sub-detection point, wherein each of the voltage detection lines includes a first sub-voltage detection line and a second sub-voltage detection line, and each of the switch units includes a first sub-switch unit and a second sub-switch unit;
the first sub-detection line is connected with a power supply voltage wiring at a first sub-detection point through the first sub-switch unit, and the second sub-detection line is connected with a power supply voltage wiring at a second sub-detection point through the second sub-switch unit.
Optionally, on the wiring surface of the power voltage wiring, the connection ends of the first and second sub-switch units of the switch unit and the power voltage wiring are respectively located at the edge end portions of two opposite sides of the power voltage wiring.
Optionally, in the extending direction of the scanning control line, the first sub-switch unit and the second sub-switch unit of the switch unit are respectively located at two sides of the pixel unit array;
and/or, in the extending direction of the scanning control line, the first sub-voltage detection line and the second sub-voltage detection line are respectively located at two sides of the pixel unit array.
Optionally, each of the voltage detection lines includes a first sub-voltage detection line and a second sub-voltage detection line, and all the switch units are alternately divided into a first switch unit group and a second switch unit group;
the first sub-detection line is connected with the power supply voltage wiring at the corresponding detection point through the switch unit of the first switch unit group, and the second sub-detection line is connected with the power supply voltage wiring at the corresponding detection point through the switch unit of the second switch unit group.
Optionally, on the wiring surface of the power supply voltage wiring, the connection end between the switch unit of the first switch unit group and the power supply voltage wiring and the connection end between the switch unit of the second switch unit group and the power supply voltage wiring are respectively located at the edge end portions of two opposite sides of the power supply voltage wiring.
Optionally, in an extending direction of the scanning control line, the first switch unit group and the second switch unit group are respectively located at two sides of the pixel unit array;
and/or, in the extending direction of the scanning control line, the first sub-voltage detection line and the second sub-voltage detection line are respectively located at two sides of the pixel unit array.
Optionally, the display device includes:
the driving circuit comprises cascaded multi-stage scanning control circuits, the output end of each stage of scanning control circuit is connected with a corresponding scanning control line, and the multi-stage scanning control circuits are used for sequentially outputting scanning control signals;
the control end of each switch unit is respectively connected with the output end of a scanning control circuit, and all the switch units are sequentially controlled through the multistage scanning control circuit.
Optionally, the driving circuit further includes: the multistage first virtual stage scanning control circuit that cascades, and multistage first virtual stage scanning control circuit cascades with multistage scanning control circuit in proper order, wherein, pre-charge circuit includes:
the voltage detection line is connected with power supply voltage wiring through the first pre-charging switch units, the control end of each first pre-charging switch unit is respectively connected with the output end of a first virtual-level scanning control circuit, and all the first pre-charging switch units are sequentially controlled through the multi-level first virtual-level scanning control circuit.
Optionally, the last-stage first virtual-stage scanning control circuit in the multi-stage first virtual-stage scanning control circuit is connected to a control end of a first pre-charge switch unit.
Optionally, the driving circuit further includes: cascaded multistage second virtual level scan control circuit, and multistage scan control circuit and multistage second virtual level scan control circuit cascade in proper order, wherein, pre-charge circuit still includes:
and the voltage detection line is connected with the power supply voltage wiring through the second pre-charging switch units, the control end of each second pre-charging switch unit is respectively connected with the output end of a second virtual-level scanning control circuit, and all the second pre-charging switch units are sequentially controlled through the multi-level second virtual-level scanning control circuit.
Optionally, the voltage access end of the power voltage wiring is located at one side end of the power voltage wiring in the extending direction of the data line, and at least one row of pixel units is included between two adjacent detection points.
Optionally, the display device further includes:
the compensation circuit is connected with the detection module, the detection module is also used for comparing the power supply voltage at the current detection point with the reference power supply voltage, and the compensation circuit is used for performing corresponding data voltage compensation on the pixel units from the current detection point to the position in front of the next detection point according to the detection result of the detection module.
Correspondingly, the invention also provides a control method of the display device, wherein the display device is the display device, and the control method comprises the following steps:
the voltage detection circuit detects the power supply voltage circulation of the power supply voltage wiring at all detection points, and the pre-charging voltage circuit performs pre-charging voltage on the voltage detection line before each circulation detection.
Compared with the prior art, the technical scheme provided by the invention at least has the following advantages:
the invention provides a display device and a control method thereof, comprising the following steps: the pixel array comprises a power supply voltage wiring, a plurality of scanning control lines and a plurality of data lines, wherein the scanning control lines and the data lines are crossed to limit a pixel unit array; the voltage detection circuit comprises a voltage detection line and a plurality of switch units, wherein the voltage detection line is electrically connected with a power supply voltage wiring at a detection point through one switch unit; the pre-charging circuit is electrically connected with the voltage detection line and is used for controlling the voltage detection line to be connected with reference voltage; and the detection module is electrically connected with the voltage detection line and is used for detecting the power supply voltage of the access detection point of the voltage detection line.
In view of the above, according to the technical scheme provided by the present invention, the plurality of detection points are disposed on the power voltage wiring, and each of the detection points is electrically connected to the detection module through the voltage detection circuit, so that when the switch unit in the voltage detection circuit is turned on, the power voltage at the detection point can be transmitted to the detection module through the voltage detection line, thereby achieving the purpose of detecting the power voltage at the detection point. Meanwhile, the voltage detection circuit provided by the invention circularly detects the power supply voltage of the power supply voltage wiring at all detection points, and the pre-charging voltage circuit performs pre-charging voltage on the voltage detection line before each circular detection, so that the condition that the power supply voltage at a plurality of detection points which are firstly detected cannot be timely transmitted to the detection module in the initial time of each circular detection can be avoided, and the purpose of accurately detecting the power supply voltage at each detection point is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another display device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another display device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another display device according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another display device according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another display device according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another display device according to an embodiment of the invention;
fig. 8 is a schematic structural diagram of another display device according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of another display device according to an embodiment of the invention;
fig. 10 is a schematic structural diagram of another display device according to an embodiment of the invention;
fig. 11 is a schematic structural diagram of another display device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As described in the background art, a power supply voltage wiring for supplying a power supply voltage signal is generally electrically connected to a plurality of pixel circuits in order to supply the power supply voltage signal to the pixel circuits of the display area. However, the power voltage wiring is affected by voltage drop, crosstalk and other factors, so that the power voltages output by the power voltage wiring in different regions are different, and the value of the power voltage affects the current value I of the pixel for emitting light. For example, the power supply voltages provided by the power supply voltage wiring in different regions are different, so that the power supply voltages transmitted to the pixel circuits in different regions are different, which causes uneven display brightness of the whole panel of the display device and reduces the display effect of the display device.
Based on the above, the invention provides a display device and a control method thereof, which effectively solve the technical problems in the prior art and can accurately detect the power supply voltage at each detection point.
In order to achieve the above object, the technical solutions provided by the present invention are described in detail below, specifically with reference to fig. 1 to 11.
Referring to fig. 1, a schematic structural diagram of a display device according to an embodiment of the present invention is shown, where the display device includes:
the pixel structure comprises a power supply voltage wiring 100, a plurality of scanning control lines Scan and a plurality of Data lines Data, wherein the scanning control lines Scan and the Data lines Data are crossed to limit a pixel unit array, the power supply voltage wiring 100 is used for providing power supply voltage for all pixel units, and a plurality of detection points 110 are arranged on the power supply voltage wiring 100;
a voltage detection circuit including a voltage detection line 210 and a plurality of switch units 220, the voltage detection line 210 being electrically connected to the power supply voltage wiring 100 at one detection point 110 through one switch unit 220;
the pre-charging voltage circuit 300, the pre-charging voltage circuit 300 is electrically connected with the voltage detection line 210, and is used for controlling the voltage detection line 210 to access a reference voltage;
and the detection module 400, the voltage detection line 210 is electrically connected with the detection module 400, and detects the power voltage of the voltage detection line 210 connected to the detection point 110.
Correspondingly, the invention also provides a control method of the display device, wherein the display device is the display device, and the control method comprises the following steps:
the voltage detection circuit sequentially and circularly detects the power supply voltages of the power supply voltage wiring at all detection points according to the sequence of lightening the pixel rows, and the pre-charging voltage circuit performs pre-charging voltage on the voltage detection lines before each circular detection.
It can be understood that, according to the technical scheme provided by the invention, a plurality of detection points are arranged on the power voltage wiring, and each detection point is electrically connected to the detection module through the voltage detection circuit, so that when the switch unit in the voltage detection circuit is turned on, the power voltage at the detection point can be transmitted to the detection module through the voltage detection line, and the purpose of detecting the power voltage at the detection point is further achieved.
And, because the voltage detection line is in a floating state before the detection is started when the power supply voltage at the first detection point or even the first detection points is detected in the initial time of each cycle detection, the voltage value on the voltage detection line is seriously reduced along with the time, and the power supply voltage values detected at the first detection points cannot be transmitted to the detection module in time, namely, the detected power supply voltage values are inaccurate, and finally the detection precision is low. Therefore, the voltage detection circuit provided by the invention circularly detects the power supply voltage of the power supply voltage wiring at all detection points, and the pre-charging voltage circuit performs pre-charging voltage on the voltage detection line before each circular detection, so that the condition that the power supply voltage at a plurality of detection points which are firstly detected cannot be timely transmitted to the detection module in the initial time of each circular detection can be avoided, and the purpose of accurately detecting the power supply voltage at each detection point is achieved.
Alternatively, the detection module provided by the present invention may be integrated in a driving IC of the display device, or it may also be an independent detection structure, and the present invention is not limited in particular.
As shown in fig. 1, the power voltage wiring 100 according to the embodiment of the present invention may include a plurality of first power lines 101 parallel to the extending direction of the Data lines Data, and at one end of the extending direction of the first power lines 101, the power voltage wiring 100 is connected to a second power line 102 parallel to the extending direction of the scanning control line Scan, so as to obtain a power voltage wiring 100 in a comb shape as a whole; the second power line 102 may be disposed on a side of the first power line 101 close to the driving IC. In addition, the power voltage wiring provided in the embodiment of the present invention may also be of other types, such as a grid shape, and the present invention is not particularly limited.
As shown in fig. 1, in the extending direction of the Data line Data, the power voltage wiring 100 provided by the embodiment of the invention is provided with at least one voltage access port at the side close to the driving IC, and the voltage access port can be electrically connected to the control main board of the display device through the flexible circuit board FPC.
Optionally, the switch unit provided by the present invention may include a thin film transistor, wherein one end of the transistor is electrically connected to the detection point, and the other end of the transistor is electrically connected to the voltage detection line, so that when the thin film transistor is turned on, the detection line can detect the power voltage at the corresponding detection point. Optionally, the transistor of the switch unit provided in the embodiment of the present invention may be an N-type transistor, and may also be a P-type transistor, which is not specifically limited in the present invention and needs to be determined according to an effective level signal output by a control terminal connected to the transistor; if the effective level signal output by the control end is a high level signal, the transistor is an N-type transistor; if the active level signal output by the control terminal is a low level signal, the transistor is a P-type transistor.
Further, as shown in fig. 2, compared with the power voltage wiring of the display device shown in fig. 1, the power voltage wiring 100 provided in the embodiment of the present invention may further include a third power line 103, and the third power line 103 and the second power line 102 are respectively located at two ends of the first power line 101, so as to obtain the power voltage wiring 100 in a grid shape as a whole, and further connect all the first power lines 101 in parallel through the second power line 102 and the third power line 103, so as to reduce the impedance of the power voltage wiring 100 and improve the voltage drop problem thereof. The technical solutions provided by the embodiments of the present invention are described in more detail below with reference to the accompanying drawings. In the following description, parameters such as the shape and voltage access of the power supply voltage wiring shown in fig. 2 are taken as examples, and the present invention is not particularly limited.
In one embodiment of the present invention, the control structure of the switch unit provided by the present invention can multiplex the scan control circuit of the display device. Referring to fig. 3, a schematic structural diagram of another display device according to an embodiment of the present invention is shown, where the display device includes:
the driving circuit comprises cascaded multistage scanning control circuits SR, the output end of each stage of scanning control circuit SR is connected with the corresponding scanning control line, and the multistage scanning control circuits SR are used for outputting scanning control signals in sequence;
the control end of each switch unit 220 is connected to the output end of a scan control circuit SR, and all the switch units 220 are sequentially controlled by the multi-stage scan control circuit SR.
It should be noted that the type of the transistor of the switch unit provided in the embodiment of the present invention needs to be determined according to the active level signal of the scan control signal output by the scan control circuit, where the active level signal is a high level signal, and the transistor is an N-type transistor; if the active level signal output by the control terminal is a low level signal, the transistor is a P-type transistor.
It can be understood that all the detection points provided by the embodiment of the present invention may be sequentially arranged along the extending direction of the data line, and all the switch units may be sequentially turned on according to the sequentially arranged sequence, so as to complete one detection in the cyclic detection process. Therefore, the control end of the switch unit can be electrically connected with the output end of the scanning control circuit, and the aim of circularly detecting the detection point of the power voltage wiring is fulfilled by the function of gradually outputting the scanning control signal in the process of displaying the picture by any frame of the multi-stage scanning control circuit, and simultaneously, the aim of sequentially starting all the switch units during one-time detection in the circularly detecting process is fulfilled.
It should be noted that the number of the switch units provided by the embodiment of the present invention may be the same as the number of the scan control circuits, and at this time, the switch units are electrically connected to the scan control circuits in a one-to-one correspondence; or, the number of the switch units can be smaller than that of the scanning control circuits, at this time, the scanning control circuits are selectively and electrically connected with the switch units according to the scanning sequence of the scanning control signals output by the multi-stage scanning control circuits step by step, and the invention does not limit the selection of the electrically connected switch units and the scanning control circuits, and only needs to achieve the purpose of sequentially starting the switch units on the arrangement sequence.
When the switching unit provided by the embodiment of the invention is controlled by the scanning control circuit, the pre-charging voltage circuit can be controlled by combining with the virtual scanning control circuit arranged at the front end of the multi-stage scanning control circuit. Specifically referring to fig. 4, a schematic structural diagram of another display device provided in an embodiment of the present invention is shown, where the driving circuit provided in the embodiment of the present invention further includes:
a cascaded multi-stage first Dummy stage scan control circuit Dummy1, and the multi-stage first Dummy stage scan control circuit Dummy1 is cascaded with the multi-stage scan control circuit SR in sequence, wherein the pre-charge circuit includes:
at least one first pre-charge switch unit 310, the voltage detection line 210 is connected to the power voltage wiring 100 through the first pre-charge switch unit 310, a control terminal of each first pre-charge switch unit 310 is respectively connected to an output terminal of a first Dummy scan control circuit Dummy1, and all the first pre-charge switch units 310 are sequentially controlled through the multi-stage first Dummy scan control circuit Dummy 1.
It can be understood that the multi-stage first virtual-stage scanning control circuit provided in the embodiment of the present invention is cascaded to the front end of the multi-stage scanning control circuit, that is, after the multi-stage first virtual-stage scanning control circuit outputs the scanning control signal stage by stage, the multi-stage scanning control circuit outputs the scanning control signal stage by stage. Therefore, before the multi-stage scanning control circuit controls all the switch units to start and detect the power supply voltage at the detection points each time, the first pre-charging switch unit can be started to control the voltage detection line to be connected with the power supply voltage output by the power supply voltage wiring, so that the serious voltage drop condition in the voltage detection line can be improved, the condition that the power supply voltage at a plurality of detection points detected firstly cannot be transmitted to the detection module in time in the initial time of each cycle detection is avoided, and the purpose of accurately detecting the power supply voltage at each detection point is achieved.
Optionally, the last-stage first virtual-stage scan control circuit in the multi-stage first virtual-stage scan control circuit provided in the embodiment of the present invention is connected to a control terminal of a first pre-charge switch unit, so as to avoid an over-long suspension time of the voltage detection line.
Furthermore, when the switch unit provided in the embodiment of the present invention is controlled by the scan control circuit, the precharge voltage circuit may further be controlled by combining with a dummy stage scan control circuit located at the end of the multi-stage scan control circuit. Referring to fig. 5, a schematic structural diagram of another display device provided in an embodiment of the present invention is shown, where the driving circuit provided in the embodiment of the present application further includes: a cascaded multi-stage second Dummy stage scan control circuit Dummy2, and the multi-stage scan control circuit SR is cascaded with the multi-stage second Dummy stage scan control circuit Dummy2 in sequence, wherein the pre-charge circuit further includes:
at least one second pre-charge switch unit 320, the voltage detection line 210 is connected to the power voltage wiring 100 through the second pre-charge switch unit 320, a control terminal of each second pre-charge switch unit 320 is respectively connected to an output terminal of a second Dummy scan control circuit Dummy2, and all the second pre-charge switch units 320 are sequentially controlled through the multi-stage second Dummy scan control circuit Dummy 2.
It can be understood that the multi-stage second virtual-stage scan control circuit provided in the embodiment of the present invention is cascaded to the end of the multi-stage scan control circuit, that is, after the multi-stage scan control circuit outputs the scan control signal stage by stage, the multi-stage second virtual-stage scan control circuit outputs the scan control signal stage by stage. Therefore, before the multi-stage scanning control circuit controls all the switch units to start and detect the power supply voltage at the detection points each time, the second pre-charging switch unit can be started to control the voltage detection line to be connected with the power supply voltage output by the power supply voltage wiring, so that the serious voltage drop condition in the voltage detection line can be further improved, the condition that the power supply voltage at a plurality of detection points detected firstly cannot be transmitted to the detection module in time in the initial time of each cycle detection is avoided, and the purpose of accurately detecting the power supply voltage at each detection point is achieved.
It should be noted that, the first precharge switch and the second precharge switch provided in the embodiments of the present invention may each include a transistor, i.e., a gate of the transistor is electrically connected to the dummy stage scan control circuit, one end of the transistor is electrically connected to the power supply voltage wiring, and the other end of the transistor is electrically connected to the voltage detection line. In this regard, the present invention does not specifically limit the type of the transistor, and it needs to be determined according to the active level signal of the scan control signal outputted from the dummy stage scan control circuit.
Referring to fig. 6, a schematic structural diagram of another display device according to an embodiment of the present invention is shown, wherein each of the detection points provided in the embodiment of the present invention includes a first sub-detection point 111 and a second sub-detection point 112, each of the voltage detection lines includes a first sub-voltage detection line 211 and a second sub-voltage detection line 212, and each of the switch units includes a first sub-switch unit 221 and a second sub-switch unit 222;
the first sub-detection line 211 is electrically connected to the power supply voltage wiring 100 at the first sub-detection point 111 through the first sub-switching unit 221, and the second sub-detection line 212 is electrically connected to the power supply voltage wiring 100 at the second sub-detection point 112 through the second sub-switching unit 222.
It can be understood that, in the embodiment of the present invention, the detection point at the voltage drop value area of the power voltage wiring is divided into the first sub detection point and the second sub detection point, the power voltage at the same voltage drop value area on the power voltage wiring is detected simultaneously by the first sub detection point and the second sub detection point, and the first sub voltage detection line and the second sub voltage detection line are electrically connected to the same detection end of the detection module, so as to further improve the accuracy of the actual power voltage on the power voltage wiring.
As shown in fig. 7, a schematic structural diagram of another display device according to an embodiment of the present invention is provided, in which the scan control circuit according to an embodiment of the present invention may include a first sub-scan control circuit SR1 and a second sub-scan control circuit SR 2. When the control terminal of the switch unit is electrically connected to the scan control circuit, the first sub-scan control circuit SR1 is electrically connected to the control terminal of the first sub-switch unit 221, and the second sub-scan control circuit SR2 is electrically connected to the control terminal of the second sub-switch unit 222; the first sub-scan control circuit SR1 and the second sub-scan control circuit SR2 of the same scan control circuit output scan control signals at the same time, so as to turn on the first sub-switch unit 221 and the second sub-switch unit 222 of the same switch unit at the same time.
It can be understood that, when the scan control circuit provided in the embodiment of the present invention includes the first sub-scan control circuit and the second sub-scan control circuit, the first sub-scan control circuit and the second sub-scan control circuit of the same scan control circuit are electrically connected to the same scan control signal line, so as to improve the driving capability of the scan control signal transmitted by the scan control signal line, achieve the purpose of simultaneously driving and displaying two sides of the display device, and improve the display effect.
Optionally, the first sub-scanning control circuit and the second sub-scanning control circuit provided by the invention are respectively located at two sides of the pixel unit array in the extending direction of the scanning control signal line, and compared with a mode that the first sub-scanning control circuit and the second sub-scanning control circuit are arranged at the same side, the difficulty of wiring the circuits can be reduced, and the situation that all the scanning control circuits are arranged at one side of the display device to cause an excessively wide frame at one side of the display device can be avoided.
In order to facilitate connection of the sub-switch units to the power supply voltage wiring, according to an embodiment of the present invention, on the wiring surface of the power supply voltage wiring, connection ends of the first sub-switch unit and the second sub-switch unit of the switch unit to the power supply voltage wiring are respectively located at edge ends of two opposite sides of the power supply voltage wiring. As shown in fig. 5, the first sub-detection point 111 and the second sub-detection point 112 provided in the embodiment of the present invention are respectively located at both side ends of the power voltage wiring 100 in the extending direction of the scan signal line.
In order to avoid the situation that the single side of the display device is too wide, in the technical solution provided in the embodiment of the present invention, in the extending direction of the scan control line, the first sub-switch unit 221 and the second sub-switch unit 222 of the switch unit are respectively located at two sides of the pixel unit array;
and/or, in the extending direction of the scan control line, the first sub-voltage detecting line 211 and the second sub-voltage detecting line 212 are respectively located at two sides of the pixel unit array.
Referring to fig. 8, a schematic structural diagram of another display device according to an embodiment of the present invention is shown, wherein each of the voltage detection lines provided in the embodiment of the present invention includes a first sub-voltage detection line 211 and a second sub-voltage detection line 212, and all the switch units are alternately divided into a first switch unit group 2201 and a second switch unit group 2202;
the first sub-detection line 211 is connected to the power supply voltage wiring 100 at the corresponding detection point 110 through the switch cell 220 of the first switch cell group 2201, and the second sub-detection line 212 is connected to the power supply voltage wiring 100 at the corresponding detection point 110 through the switch cell 220 of the second switch cell group 2202.
In order to facilitate connection of the switch cells to the power supply voltage wiring, as shown in fig. 8, on the wiring surface of the power supply voltage wiring, the connection terminals of the switch cells 220 of the first switch cell group 2201 and the power supply voltage wiring 100 and the connection terminals of the switch cells 220 of the second switch cell group 2202 and the power supply voltage wiring 100 are respectively located at the edge end portions on opposite sides of the power supply voltage wiring 100.
In order to avoid the situation that the single-side frame of the display device is too wide, as shown in fig. 8, in the technical solution provided in the embodiment of the present invention, in the extending direction of the scanning control line, the first switch cell group 2201 and the second switch cell group 2202 are respectively located at two sides of the pixel cell array;
and/or, in the extending direction of the scan control line, the first sub-voltage detecting line 211 and the second sub-voltage detecting line 212 are respectively located at two sides of the pixel unit array.
Optionally, when the switch unit provided by the embodiment of the invention is divided into the first switch unit group and the second switch unit group which are respectively arranged at two sides of the pixel unit array, and the switch unit is controlled by the multi-stage scanning driving circuit, the display device provided by the embodiment of the invention can also realize bilateral stage-by-stage driving display scanning. Specifically, referring to fig. 9, a schematic structural diagram of another display device according to an embodiment of the present invention is shown, wherein the multi-stage scan control circuit SR is divided into two groups of scan control circuits step by step alternately, one group of scan control circuits is electrically connected to the switch unit 220 of the first switch unit group 2201, the other group of scan control circuits is electrically connected to the switch unit 220 of the second switch unit group 2202, and each scan control circuit is electrically connected to a corresponding scan control signal line. The two groups of scanning control circuits are respectively positioned on two sides of the pixel unit array in the extending direction of the scanning control signal line, so that the detection of the detection line to the power supply voltage of the corresponding detection point can be realized while the bilateral step-by-step driving display scanning is realized, and the condition that all the scanning control circuits are arranged on one side of the display device to cause the one side of the display device to be too wide can be avoided.
The invention can arrange the detection points between the adjacent rows of pixel units, thereby avoiding the influence of the detection point connecting circuit on the aperture opening ratio of the display device; in addition, the number of rows of pixel units between two adjacent detection points is not limited, and as shown in fig. 10, in an embodiment of the present invention, the voltage access end of the power voltage wiring 100 is located at the same side end of the power voltage wiring 100 in the data line extending direction X, and at least one row of pixel units Pi is included between two adjacent detection points 110.
Optionally, in all pixel unit rows provided by the present invention, a detection point is disposed between any two adjacent rows of pixel units, and more detection points are disposed on the power voltage wiring to improve the power voltage detection effect on the power voltage wiring.
The current passing through the light emitting diode in the pixel circuit is I-k (V)pvdd-Vdata-Vth)2Calculated, I is current, k is constant, VpvddIs the supply voltage, VdataIs a data voltage, VthIs the threshold voltage of the drive transistor of the pixel circuit, and thus the supply voltage VpvddWhen the change occurs, the current flowing through the light emitting diode is influenced, and the light emitting of the light emitting diode in the pixel circuit is influenced. The invention can achieve the purpose of improving the display effect of the display device by comparing the power supply voltage of the detected power supply voltage wiring with the reference voltage and then compensating the data voltage of the pixel circuit according to the comparison result. Fig. 11 is a schematic structural diagram of another display device according to an embodiment of the present invention, wherein the schematic structural diagram of the display device is provided in the embodiment of the present inventionThe display device further comprises:
the compensation circuit 500 is connected to the detection module, the detection module 400 is further configured to compare the power voltage at the current detection point 100 with a reference power voltage, and the compensation circuit 500 is configured to perform corresponding data voltage compensation on the pixel unit Pi from the current detection point 110 to the next detection point 110 according to the detection result of the detection module 400.
It can be understood that, in the display device provided by the embodiment of the present invention, at least one row of pixel units is included between adjacent detection points, and in the cyclic detection direction of all the detection points, the data voltages of all the pixel units between the previous detection point and the next detection point are compensated according to the detection result of the previous detection point on the power voltage of the power voltage wiring. After comparing the difference between the power supply voltage at the current detection point and the reference power supply voltage, the detection module sends a corresponding comparison result to the compensation circuit; the compensation circuit determines the compensation amount of the data voltage according to the comparison result, and then the compensation amount is applied to the pixel unit corresponding to the current detection point through the data line by the driving IC, so that the current flowing through the light emitting diode in the pixel circuit is expected current, and the display effect of the display device is improved.
The invention provides a display device and a control method thereof, comprising the following steps: the pixel array comprises a power supply voltage wiring, a plurality of scanning control lines and a plurality of data lines, wherein the scanning control lines and the data lines are crossed to limit a pixel unit array; the voltage detection circuit comprises a voltage detection line and a plurality of switch units, wherein the voltage detection line is electrically connected with a power supply voltage wiring at a detection point through one switch unit; the pre-charging circuit is electrically connected with the voltage detection line and is used for controlling the voltage detection line to be connected with reference voltage; and the detection module is electrically connected with the voltage detection line and is used for detecting the power supply voltage of the access detection point of the voltage detection line.
In view of the above, according to the technical scheme provided by the present invention, the plurality of detection points are disposed on the power voltage wiring, and each of the detection points is electrically connected to the detection module through the voltage detection circuit, so that when the switch unit in the voltage detection circuit is turned on, the power voltage at the detection point can be transmitted to the detection module through the voltage detection line, thereby achieving the purpose of detecting the power voltage at the detection point. Meanwhile, the voltage detection circuit provided by the invention circularly detects the power supply voltage of the power supply voltage wiring at all detection points, and the pre-charging voltage circuit performs pre-charging voltage on the voltage detection line before each circular detection, so that the condition that the power supply voltage at a plurality of detection points which are firstly detected cannot be timely transmitted to the detection module in the initial time of each circular detection can be avoided, and the purpose of accurately detecting the power supply voltage at each detection point is achieved.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (12)
1. A display device, comprising:
the pixel array comprises a power supply voltage wiring, a plurality of scanning control lines and a plurality of data lines, wherein the scanning control lines and the data lines are crossed to limit a pixel unit array;
the voltage detection circuit comprises a voltage detection line and a plurality of switch units, wherein the voltage detection line is electrically connected with a power supply voltage wiring at a detection point through one switch unit;
the pre-charging circuit is electrically connected with the voltage detection line and is used for controlling the voltage detection line to be connected with reference voltage;
the voltage detection line is electrically connected with the detection module and used for detecting the power supply voltage of the voltage detection line at the access detection point;
the display device includes: the driving circuit comprises cascaded multi-stage scanning control circuits, the output end of each stage of scanning control circuit is connected with a corresponding scanning control line, and the multi-stage scanning control circuits are used for sequentially outputting scanning control signals; the control end of each switch unit is respectively connected with the output end of a scanning control circuit, and all the switch units are sequentially controlled by the multistage scanning control circuit;
the drive circuit further includes: the multistage first virtual stage scanning control circuit that cascades, and multistage first virtual stage scanning control circuit cascades with multistage scanning control circuit in proper order, wherein, pre-charge circuit includes: the voltage detection line is connected with power supply voltage wiring through the first pre-charging switch units, the control end of each first pre-charging switch unit is respectively connected with the output end of a first virtual-level scanning control circuit, and all the first pre-charging switch units are sequentially controlled through the multi-level first virtual-level scanning control circuit.
2. The display device according to claim 1, wherein each of the detection points comprises a first sub-detection point and a second sub-detection point, wherein each of the voltage detection lines comprises a first sub-voltage detection line and a second sub-voltage detection line, and each of the switch units comprises a first sub-switch unit and a second sub-switch unit;
the first sub-voltage detection line is connected with a power supply voltage wiring at a first sub-detection point through the first sub-switch unit, and the second sub-voltage detection line is connected with a power supply voltage wiring at a second sub-detection point through the second sub-switch unit.
3. The display device according to claim 2, wherein connection terminals of the first and second sub-switch cells of the switch cells to the power supply voltage wiring are respectively located at edge ends of opposite sides of the power supply voltage wiring on a wiring surface of the power supply voltage wiring.
4. The display device according to claim 2, wherein the first sub-switching unit and the second sub-switching unit of the switching unit are respectively located on both sides of the pixel unit array in an extending direction of the scanning control line;
and/or, in the extending direction of the scanning control line, the first sub-voltage detection line and the second sub-voltage detection line are respectively located at two sides of the pixel unit array.
5. The display device according to claim 1, wherein each of the voltage detection lines includes a first sub-voltage detection line and a second sub-voltage detection line, and all the switching cells are alternately divided into a first switching cell group and a second switching cell group;
the first sub-detection line is connected with the power supply voltage wiring at the corresponding detection point through the switch unit of the first switch unit group, and the second sub-detection line is connected with the power supply voltage wiring at the corresponding detection point through the switch unit of the second switch unit group.
6. The display device according to claim 5, wherein connection terminals of the switch cells of the first switch cell group and the power supply voltage wiring and connection terminals of the switch cells of the second switch cell group and the power supply voltage wiring are respectively located at edge ends of opposite sides of the power supply voltage wiring on a wiring surface of the power supply voltage wiring.
7. The display device according to claim 5, wherein the first and second switching cell groups are respectively located on both sides of the pixel cell array in an extending direction of the scanning control line;
and/or, in the extending direction of the scanning control line, the first sub-voltage detection line and the second sub-voltage detection line are respectively located at two sides of the pixel unit array.
8. The display device according to claim 1, wherein the last stage first dummy stage scan control circuit in the multi-stage first dummy stage scan control circuit is connected to a control terminal of a first precharge switch unit.
9. The display device according to claim 1, wherein the driving circuit further comprises: cascaded multistage second virtual level scan control circuit, and multistage scan control circuit and multistage second virtual level scan control circuit cascade in proper order, wherein, pre-charge circuit still includes:
and the voltage detection line is connected with the power supply voltage wiring through the second pre-charging switch units, the control end of each second pre-charging switch unit is respectively connected with the output end of a second virtual-level scanning control circuit, and all the second pre-charging switch units are sequentially controlled through the multi-level second virtual-level scanning control circuit.
10. The display device according to any one of claims 1 to 9, wherein the voltage input terminal of the power supply voltage wiring is located at one side end portion of the power supply voltage wiring in the extending direction of the data line, and at least one row of pixel cells is included between two adjacent detection points.
11. The display device according to claim 10, further comprising:
the compensation circuit is connected with the detection module, the detection module is also used for comparing the power supply voltage at the current detection point with the reference power supply voltage, and the compensation circuit is used for performing corresponding data voltage compensation on the pixel units from the current detection point to the position in front of the next detection point according to the detection result of the detection module.
12. A control method of a display device according to any one of claims 1 to 11, wherein the control method comprises:
the voltage detection circuit detects the power supply voltage circulation of the power supply voltage wiring at all detection points, and the pre-charging voltage circuit performs pre-charging voltage on the voltage detection line before each circulation detection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911411393.4A CN111028777B (en) | 2019-12-31 | 2019-12-31 | Display device and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911411393.4A CN111028777B (en) | 2019-12-31 | 2019-12-31 | Display device and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111028777A CN111028777A (en) | 2020-04-17 |
| CN111028777B true CN111028777B (en) | 2021-12-07 |
Family
ID=70197618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911411393.4A Active CN111028777B (en) | 2019-12-31 | 2019-12-31 | Display device and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111028777B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111402812B (en) * | 2020-04-27 | 2021-11-16 | 京东方科技集团股份有限公司 | Adjusting module, testing method and display device |
| CN112255847B (en) | 2020-11-02 | 2022-06-28 | 武汉天马微电子有限公司 | Display module, display device and driving method of display module |
| CN112397564B (en) * | 2020-11-17 | 2023-04-07 | 武汉华星光电半导体显示技术有限公司 | Organic light emitting display panel and organic light emitting display device |
| CN112700745B (en) * | 2021-01-19 | 2023-05-05 | Tcl华星光电技术有限公司 | Display panel driving method and display panel |
| CN113808538B (en) * | 2021-09-22 | 2023-06-06 | 昆山国显光电有限公司 | Display panel, driving method and driving device thereof and display device |
| CN114360454B (en) * | 2021-12-29 | 2022-10-21 | 长沙惠科光电有限公司 | Light-emitting unit control circuit, method, array substrate and display panel |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6100865A (en) * | 1996-06-10 | 2000-08-08 | Kabushiki Kaisha Toshiba | Display apparatus with an inspection circuit |
| CN101976546A (en) * | 2010-10-19 | 2011-02-16 | 友达光电股份有限公司 | Pixel circuits with power voltage drop compensation functions and luminous panel |
| CN205680029U (en) * | 2016-01-04 | 2016-11-09 | 京东方科技集团股份有限公司 | Source voltage control circuit, drive integrated circult and display device |
| CN106128359A (en) * | 2016-09-06 | 2016-11-16 | 昆山国显光电有限公司 | OLED display device and luminance compensation method thereof |
| CN106297665A (en) * | 2016-10-31 | 2017-01-04 | 昆山国显光电有限公司 | A kind of system and method compensating AMOLED display floater internal electric source pressure drop |
| CN109243374A (en) * | 2018-11-29 | 2019-01-18 | 昆山国显光电有限公司 | The voltage-drop compensation system and method for display panel internal electric source |
| CN109637444A (en) * | 2019-01-10 | 2019-04-16 | 昆山国显光电有限公司 | A kind of display device and its driving method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5109684B2 (en) * | 2007-06-22 | 2012-12-26 | セイコーエプソン株式会社 | Detection device and electronic device |
| KR102016391B1 (en) * | 2012-12-03 | 2019-08-30 | 엘지디스플레이 주식회사 | Organic Light Emitting Display Device and Method for Operating The Same |
| CN109243367B (en) * | 2018-09-19 | 2020-10-09 | 昆山国显光电有限公司 | Threshold voltage detection circuit and detection method |
-
2019
- 2019-12-31 CN CN201911411393.4A patent/CN111028777B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6100865A (en) * | 1996-06-10 | 2000-08-08 | Kabushiki Kaisha Toshiba | Display apparatus with an inspection circuit |
| CN101976546A (en) * | 2010-10-19 | 2011-02-16 | 友达光电股份有限公司 | Pixel circuits with power voltage drop compensation functions and luminous panel |
| CN205680029U (en) * | 2016-01-04 | 2016-11-09 | 京东方科技集团股份有限公司 | Source voltage control circuit, drive integrated circult and display device |
| CN106128359A (en) * | 2016-09-06 | 2016-11-16 | 昆山国显光电有限公司 | OLED display device and luminance compensation method thereof |
| CN106297665A (en) * | 2016-10-31 | 2017-01-04 | 昆山国显光电有限公司 | A kind of system and method compensating AMOLED display floater internal electric source pressure drop |
| CN109243374A (en) * | 2018-11-29 | 2019-01-18 | 昆山国显光电有限公司 | The voltage-drop compensation system and method for display panel internal electric source |
| CN109637444A (en) * | 2019-01-10 | 2019-04-16 | 昆山国显光电有限公司 | A kind of display device and its driving method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111028777A (en) | 2020-04-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111028777B (en) | Display device and control method thereof | |
| US11049441B2 (en) | LED display device and method for driving the same | |
| US8018402B2 (en) | Organic light emitting display device and testing method thereof | |
| US8816942B2 (en) | Luminous display and method for controlling the same | |
| CN111833801B (en) | Display system and common driving circuit thereof | |
| CN110021261B (en) | Array substrate, driving method thereof and display panel | |
| CN108806567B (en) | Display panel, detection method and detection module thereof, and display device | |
| CN113593470B (en) | Light emitting device driving circuit, backlight module and display panel | |
| CN211654192U (en) | Array substrate and splicing display panel | |
| US11741888B2 (en) | LED display device, driving method and chip thereof | |
| US20230402011A1 (en) | Display panel, method for driving the same, and display apparatus | |
| CN110930937B (en) | Display panel and driving method | |
| CN115424578B (en) | Display driving circuit and display device | |
| US20230386391A1 (en) | Display panel, driving circuit and driving method | |
| CN107680534B (en) | Display device | |
| CN110992884B (en) | Display panel, display device and detection compensation method of display panel | |
| CN115223491A (en) | Light emitting display device and driving apparatus thereof | |
| CN116030763B (en) | Display panel and display device | |
| CN113179662B (en) | Display substrate and display device | |
| CN114724515B (en) | Display panel, driving method thereof and display device | |
| CN114822394B (en) | Dimming method, device and equipment of display panel and computer readable storage medium | |
| US11900868B2 (en) | Display panel and display device | |
| US20240038170A1 (en) | Pixel driving circuit, display panel and driving method thereof, and display device | |
| CN116171072A (en) | Display panel and display device | |
| CN115547243A (en) | Light-emitting panel, driving method thereof and display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |