CN106920510B - Organic light emitting display and its driving method - Google Patents
Organic light emitting display and its driving method Download PDFInfo
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- CN106920510B CN106920510B CN201510990653.3A CN201510990653A CN106920510B CN 106920510 B CN106920510 B CN 106920510B CN 201510990653 A CN201510990653 A CN 201510990653A CN 106920510 B CN106920510 B CN 106920510B
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- 239000004973 liquid crystal related substance Substances 0.000 description 2
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3258—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
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- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
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Abstract
The present invention provides a kind of organic light emitting display and its driving methods, wherein the organic light emitting display includes: multiple pixel unit and at least one compensation circuit in matrix arrangement；The multiple pixel unit shares at least one described compensation circuit, and the compensation circuit is used to compensate the drive transistor threshold voltage of the pixel unit.In organic light emitting display provided by the invention and its driving method, in such a way that multiple pixel units share a compensation circuit, it is not only able to realize the compensation of drive transistor threshold voltage, brightness disproportionation caused by avoiding because of threshold voltage deviation, and the quantity of the transistor in the pixel unit can be reduced, to realize higher pixel density, and then improve the resolution ratio of the organic light emitting display.
Description
Technical Field
The invention relates to the technical field of flat panel display, in particular to an organic light emitting display and a driving method thereof.
Background
The Organic light emitting display displays images by using Organic Light Emitting Diodes (OLEDs), is an active light emitting display, has a display mode different from that of a conventional Thin Film Transistor liquid crystal display (TFT-LCD), does not need a backlight, and has advantages of high contrast, fast response speed, light weight, and the like. Therefore, the organic light emitting display is known as a new generation display that can replace the thin film transistor liquid crystal display.
The organic light emitting display includes a plurality of pixels for displaying an image, the plurality of pixels being arranged in a matrix pattern, each pixel including an organic light emitting diode and a pixel circuit to drive the organic light emitting diode. The simplest 2T1C type pixel circuit is composed of two transistors and a storage capacitor, and has the characteristics of simple circuit and small number of transistors, but does not have the function of threshold compensation. The organic light emitting display using the 2T1C type pixel circuit has a display effect completely affected by the difference in uniformity of transistors, and the luminance uniformity is very poor.
The pixel circuit of 6T2C type, which is widely used, is composed of six transistors and two storage capacitors, and has good threshold compensation capability. The adoption of the pixel circuit of the 6T2C type can improve the brightness uniformity of the organic light emitting display, but the area of a single pixel is affected due to the excessive number of transistors adopted by the pixel circuit, thereby being not beneficial to improving the resolution of the organic light emitting display.
Therefore, how to solve the problem that the conventional organic light emitting display cannot simultaneously improve the brightness uniformity and the resolution becomes a technical problem to be solved urgently by the technical personnel in the field.
Disclosure of Invention
The present invention is directed to an organic light emitting display and a driving method thereof, so as to solve the problem that the conventional organic light emitting display cannot simultaneously improve the luminance uniformity and the resolution.
To solve the above problems, the present invention provides an organic light emitting display including: the pixel circuit comprises a plurality of pixel units arranged in a matrix and at least one compensation circuit; the plurality of pixel units share the at least one compensation circuit, and the compensation circuit is used for compensating the threshold voltage of the driving transistor of the pixel unit.
Optionally, in the organic light emitting display, the pixel unit includes an organic light emitting diode and a pixel circuit for driving the organic light emitting diode;
the organic light emitting diode is connected between a first power supply and a second power supply;
the pixel circuit includes a switching transistor, a driving transistor, and a storage capacitor; the switch transistor is connected between a first node and a second node, and the grid electrode of the switch transistor is connected to the scanning line; the driving transistor is connected between a first power supply and an anode of the organic light emitting diode, and a gate thereof is connected to a first node; the storage capacitor is connected between a first power supply and a first node.
Optionally, in the organic light emitting display, the compensation circuit includes: a third transistor, a fourth transistor, and a fifth transistor; the third transistor is connected between the data line and the source electrode of the fourth transistor, and the grid electrode of the third transistor is connected to the second control line; the fourth transistor is connected between the second node and the drain of the third transistor, and the grid electrode of the fourth transistor is connected to the second node; the fifth transistor is connected between a third power supply and a second node, and a gate thereof is connected to a first control line.
Optionally, in the organic light emitting display, the fourth transistor and the driving transistor have the same threshold voltage.
Optionally, in the organic light emitting display, the third power source is a low-level voltage source for providing an initialization voltage.
Optionally, in the organic light emitting display, the current provided by the driving transistor to the organic light emitting diode is determined by a data voltage provided by the data line and a first power voltage provided by the first power supply, independently of a second power voltage provided by the second power supply and a threshold voltage of the driving transistor.
Optionally, in the organic light emitting display, the pixel units connected to the same data line share the same compensation circuit.
Optionally, in the organic light emitting display, all the pixel units share the same compensation circuit.
Accordingly, the present invention also provides a driving method of an organic light emitting display including a first period, a second period, and a third period, wherein,
initializing a pixel unit of an organic light emitting display in a first time period, wherein a plurality of pixel units of the organic light emitting display share at least one compensation circuit;
writing a data signal into the pixel unit in a second time period, and simultaneously sampling the threshold voltage of the driving transistor of the pixel unit;
in a third period, the pixel unit displays an image by emitting light having a luminance corresponding to the data signal.
Optionally, in the driving method of the organic light emitting display, in a first period, a scan signal provided by a scan line is at a low level, a control signal provided by a first control line is changed from a high level to a low level, a control signal provided by a second control line is at a high level, and a data signal provided by a data line is at a high level;
in a second time period, the scanning signal provided by the scanning line keeps low level, the control signal provided by the second control line changes from high level to low level, the control signal provided by the first control line is high level, and the data signal provided by the data line is low level;
in the third time period, the scanning signal provided by the scanning line is changed from low level to high level, the control signals provided by the first control line and the second control line are kept at high level, and the data signal provided by the data line is at high level.
In the organic light emitting display and the driving method thereof provided by the invention, a mode that a plurality of pixel units share one compensation circuit is adopted, so that the compensation of the threshold voltage of the driving transistor can be realized, the brightness unevenness caused by threshold voltage deviation is avoided, and the number of the transistors in the pixel units can be reduced, thereby realizing higher pixel density and further improving the resolution of the organic light emitting display.
Drawings
Fig. 1 is a schematic partial structure diagram of an organic light emitting display according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a pixel unit and a compensation circuit according to a first embodiment of the invention;
FIG. 3 is a timing diagram illustrating a driving method of an organic light emitting display according to a first embodiment of the present invention;
fig. 4 is a schematic view of a partial structure of an organic light emitting display according to a second embodiment of the present invention.
Detailed Description
An organic light emitting display and a driving method thereof according to the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
[ EXAMPLES one ]
Fig. 1 is a schematic view of a partial structure of an organic light emitting display according to a first embodiment of the invention. As shown in fig. 1, the organic light emitting display 100 includes: a plurality of pixel units 110 arranged in a matrix and at least one compensation circuit 120; the plurality of pixel units 110 share the at least one compensation circuit 120, and the compensation circuit 120 is used for compensating the threshold voltage of the driving transistor of the pixel unit 110.
Specifically, the organic light emitting display 100 includes a display region and a non-display region (not shown), the display region includes scan lines (not shown) and data lines (Di, Di +1) that are arranged to intersect, the data lines extend along a row direction and are sequentially arranged along a column direction, and the scan lines extend along the column direction and are sequentially arranged along the row direction. The plurality of pixel units 110 are arranged in a matrix form in the crossing regions defined by the scan lines and the data lines, and each pixel unit 110 is connected to its corresponding scan line and data line for displaying an image. The compensation circuit 120 is electrically connected to the plurality of pixel units 110, and is configured to compensate for the threshold voltage of the driving transistor of the pixel unit 110 sharing the compensation circuit 120. The compensation circuit 120 may be disposed in the display area or the non-display area, and the specific position may be set according to actual needs, which is not limited herein.
Please refer to fig. 2, which is a schematic structural diagram illustrating a connection between a pixel unit and a compensation circuit according to a first embodiment of the present invention. As shown in fig. 2, the pixel unit 110 is connected to an external first power source, which is a high potential pixel power source for supplying a first power source voltage Vdd, and a second power source, which is a low potential pixel power source for supplying a second power source voltage Vss, and the first power source and the second power source serve as a driving power source of the organic light emitting diode OLED. It should be understood that the high potential pixel power supply herein is relative to the low potential pixel power supply herein, i.e., the first power supply is at a higher potential relative to the second power supply, which is at a lower potential relative to the first power supply.
With continued reference to fig. 2, the pixel unit 110 includes an organic light emitting diode OLED and a pixel circuit for driving the organic light emitting diode OLED, and the organic light emitting diode OLED is connected between a first power source and a second power source. The pixel circuit includes a switching transistor M1, a driving transistor M2, and a storage capacitor Cs; the switch transistor M1 is connected between a first node N1 and a second node N2, and the gate of the switch transistor M1 is connected to the scanning line Sn; the driving transistor M2 is connected between the first power source and the anode of the organic light emitting diode OLED, and its gate is connected to the first node N1; the storage capacitor Cs is connected between the first power source and the first node N1.
With continued reference to fig. 2, the compensation circuit 120 is connected to an external third power source for providing an initialization voltage Vref, and the compensation circuit 120 includes: a third transistor M3, a fourth transistor M4, and a fifth transistor M5; the third transistor M3 is connected between the data line and the source of the fourth transistor M4, and its gate is connected to the second control line Sa 2; the fourth transistor M4 is connected between the second node N2 and the drain of the third transistor M3, and its gate is connected to the second node N2; the fifth transistor M5 is connected between the third power supply and the second node N2, and its gate is connected to the first control line Sa 1.
In this embodiment, the first power supply, the second power supply, and the third power supply are dc voltage sources, and the voltage value of the initialization voltage Vref is close to the voltage value of the second power supply voltage Vss.
In this embodiment, the switch transistor M1, the driving transistor M2, and the third transistor M3 to the fifth transistor M5 are all thin film transistors. Preferably, the switching transistor M1, the driving transistor M2, and the third transistor M3 to the fifth transistor M5 are all P-type thin film transistors.
As shown in fig. 2, when the third transistor M3, the fourth transistor M4 and the switching transistor M1 are turned on, the data signal Vdata provided from the data line is provided to the first node N1 via the third transistor M3, the fourth transistor M4 and the switching transistor M1 in sequence, and since the drain of the fourth transistor M4 is shorted with the gate, the fourth transistor M4 is turned off from on when the voltage of the first node N1 rises to Vdata- | Vth |. Where Vth is the threshold voltage of the fourth transistor M4. Thereby, the data signal Vdata and the voltage reflecting the threshold voltage of the fourth transistor M4 are stored in the storage capacitor Cs.
Since the fourth transistor M4 has the same structure and the same position as the driving transistor M2, and the fourth transistor M4 and the driving transistor M2 have the same threshold voltage as a mirror transistor, the driving transistor threshold voltage can be compensated by the fourth transistor M4 during the light emitting phase of the OLED.
In this embodiment, the compensation circuit 120 is electrically connected to the pixel unit 110, and by driving the compensation circuit 120 and the pixel circuits of the pixel unit 110 to operate, the organic light emitting diode OLED in the pixel unit 110 can emit light with brightness corresponding to a data signal in response to a scan signal, so as to display an image, and uneven brightness caused by a threshold voltage deviation of a driving transistor can be avoided, thereby improving display quality. Meanwhile, since each pixel unit 110 has only 2 transistors and 1 capacitor, the number of transistors of the pixel unit in the display area is small, and thus higher pixel density can be achieved, thereby improving resolution. The organic light emitting display 100 has good luminance uniformity and higher resolution than the existing organic light emitting display.
Preferably, the pixel units 110 connected to the same data line share the same compensation circuit 120.
In this embodiment, the positions of the compensation circuits 120 correspond to the positions of the data lines one to one, and the pixel units 110 connected to each data line, that is, a plurality of pixel units 110 in each column share one compensation circuit 120.
Correspondingly, the invention also provides a driving method of the organic light emitting display. Referring to fig. 2 and fig. 3 in combination, the driving method of the organic light emitting display includes:
the scan cycle includes a first period T1, a second period T2, and a third period T3; wherein,
initializing a pixel unit 110 of an organic light emitting display in a first period T1, the plurality of pixel units 110 of the organic light emitting display sharing at least one compensation circuit;
writing a data signal to the pixel cell 110 while sampling a drive transistor threshold voltage for the pixel cell 110 for a second time period T2;
in the third period T3, the pixel unit 110 displays an image by emitting light having a luminance corresponding to the data signal.
Specifically, the scan cycle of the organic light emitting display 100 includes a first period T1, a second period T2, and a third period T3 in this order.
With continued reference to fig. 3, during the first time period T1, the scan signal provided by the scan line Sn is at a low level, the control signal provided by the first control line Sa1 changes from a high level to a low level, the control signal provided by the second control line Sa2 is at a high level, and the data signal Vdata provided by the data line remains at a high level. Since the scan signal supplied from the scan line Sn is at a low level, the switching transistor M1 controlled by the scan line Sn is in an on state, and since the control signal supplied from the first control line Sa1 is changed from a high level to a low level, the fifth transistor M5 controlled by the first control line Sa1 is changed from an off state to an on state, the initialization voltage Vref supplied from the third power supply is supplied to the first node N1 via the fifth transistor M5 and the switching transistor M1, so that the pixel cell 110 is initialized by the third power supply.
The first period T1 is an initialization period during which the pixel unit 110 of the organic light emitting display in which the at least one compensation circuit 120 is shared by a plurality of pixel units 110 is initialized using the third power source. After the initialization, the voltage of the first node N1 of the pixel unit 110 is Vref, i.e., the voltage of the lower substrate of the storage capacitor Cs is Vref.
With continued reference to fig. 3, during the second period T2, the scan signal supplied by the scan line Sn is kept at a low level, the control signal supplied by the second control line Sa2 is changed from a high level to a low level, the control signal supplied by the first control line Sa1 is kept at a high level, and the data signal Vdata supplied by the data line is kept at a low level. Since the control signal supplied from the first control line Sa1 maintains the high level and the fifth transistor M5 is in an off state, the initialization voltage Vref supplied from the third power source cannot be supplied to the first node N1 via the fifth transistor M5 and the switching transistor M1.
At this time, since the scan signal supplied from the scan line Sn is maintained at a low level, the switch transistor M1 controlled by the scan line Sn is still in an on state, since the control signal supplied from the second control line Sa2 is changed from a high level to a low level, the third transistor M3 controlled by the second control line Sa2 is changed from off to on, the data signal Vdata supplied from the data line starts to be written into the pixel via the third transistor M3, since the switch transistor M1, the third transistor M3 and the fourth transistor M4 are all turned on at this time, the data signal Vdata supplied from the data line is supplied to the first node N1 via the third transistor M3, the fourth transistor M4 and the switch transistor M1 in sequence, the voltage of the first node N1 starts to rise from Vref, and the fourth transistor M4 is changed to on when the voltage of the first node N1 rises to Vdata- | Vth |.
The second period T2 is a programming period during which the data signal Vdata supplied from the data line and the voltage reflecting the threshold voltage of the mirror transistor M4 are stored in the storage capacitor Cs, thereby completing sampling of the mirror transistor threshold voltage while the data signal is written. At this time, the voltage of the first node N1, i.e., the lower substrate voltage of the storage capacitor Cs, is equal to Vdata- | Vth |.
With continued reference to fig. 3, during the third period T3, the scan signal supplied by the scan line Sn changes from low level to high level, the control signals supplied by the first control line Sa1 and the second control line Sa2 both maintain high level, and the data signal Vdata supplied by the data line maintains high level. Since the scan signal supplied from the scan line Sn is changed from a low level to a high level and the switching transistor M1 controlled by the scan line Sn is changed from on to off, the fifth transistor M5 controlled by the first control line Sa1 and the third transistor M3 controlled by the second control line Sa2 are both in an off state since the control signals supplied from the first control line Sa1 and the second control line Sa2 are both kept at a high level. At this time, the voltage of the first node N1 is maintained at Vdata | Vth |.
The third period T3 is a light emitting period, since the driving transistor M2 is turned on, the driving current Ion output by the driving transistor M2 flows to the second power source along the path of the first power source through the driving transistor M2 and the organic light emitting diode OLED, causing the organic light emitting diode OLED to light up to emit light, and the pixel unit 110 displays an image by emitting light having a luminance corresponding to the data signal.
The current Ion flowing through the organic light emitting diode OLED is related to a first power voltage Vdd and a data voltage Vdata provided by a first power source, and is unrelated to a second power voltage Vss and a threshold voltage of the driving transistor provided by a second power source.
In this embodiment, the threshold voltage of the mirror transistor M4 is utilized to compensate the threshold voltage of the driving transistor, so that even if the threshold voltage of the driving transistor deviates, the threshold voltage of the mirror transistor M4 is compensated, and the current Ion flowing through the organic light emitting diode OLED is not affected.
The working processes of the first period T1, the second period T2 and the third period T3 are repeated to complete the image display function.
[ example two ]
Fig. 4 is a schematic partial structure view of an organic light emitting display according to a second embodiment of the present invention. As shown in fig. 4, the organic light emitting display 100 includes: a plurality of pixel units 110 arranged in a matrix and at least one compensation circuit 120; the plurality of pixel units 110 share the at least one compensation circuit 120, and the compensation circuit 120 is used for compensating the threshold voltage of the driving transistor of the pixel unit 110.
Specifically, as shown in fig. 4, two columns of pixel units 110 connected to two adjacent data lines share the same compensation circuit 120. That is, the first column of pixel units 110 and the second column of pixel units 110 share the first compensation circuit 120, the third column of pixel units 110 and the fourth column of pixel units 110 share the second compensation circuit 120, and so on.
The difference between this embodiment and the first embodiment is that two columns of pixel units 110 connected to two adjacent data lines share the same compensation circuit 120, instead of sharing one compensation circuit 120 for the pixel units 110 connected to each data line, the number of compensation circuits 120 in the organic light emitting display 100 is smaller.
In other embodiments, three, four, or even more pixel units 110 connected to data lines share the same compensation circuit 120, or a pixel unit 110 connected to one data line may share the same compensation circuit 120 with a pixel unit 110 connected to another data line. When all the pixel units 110 share the same compensation circuit 120, that is, the pixel units 110 in the first column to the pixel units 110 in the mth column (the last column) share the same compensation circuit 120, the number of the compensation circuits 120 is the minimum.
Preferably, adjacent pixel units 110 share the same compensation circuit 120. Thus, long-range unevenness of the threshold voltage is eliminated.
For the sake of simplicity, fig. 1 and 4 show only two data lines (Di and Di +1) and six pixel units. Those skilled in the art will appreciate that the above examples are also applicable to more data lines and more pixel cells.
It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
In summary, in the organic light emitting display and the driving method thereof provided by the present invention, a plurality of pixel units share one compensation circuit, so that not only can compensation of the threshold voltage of the driving transistor be achieved, and uneven brightness caused by threshold voltage deviation be avoided, but also the number of transistors in the pixel units can be reduced, thereby achieving higher pixel density and further improving the resolution of the organic light emitting display.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (10)
1. An organic light emitting display, comprising: the pixel circuit comprises a plurality of pixel units arranged in a matrix and at least one compensation circuit; the plurality of pixel units share the at least one compensation circuit, and the compensation circuit is used for compensating the threshold voltage of the driving transistor of the pixel unit;
the pixel unit comprises an organic light emitting diode and a pixel circuit for driving the organic light emitting diode, the pixel circuit comprises a switching transistor, a driving transistor and a storage capacitor, a grid electrode of the driving transistor and the storage capacitor are connected to a first node, and the compensation circuit comprises a fourth transistor; wherein a drain and a gate of the fourth transistor are short-circuited, a data signal supplied from a data line is supplied to the first node via the fourth transistor and the switching transistor in sequence, and the data signal and a voltage reflecting a threshold voltage of the fourth transistor are stored in the storage capacitor.
2. The organic light emitting display of claim 1, wherein the organic light emitting diode is connected between a first power source and a second power source;
the switch transistor is connected between a first node and a second node, and the grid electrode of the switch transistor is connected to the scanning line; the driving transistor is connected between a first power supply and an anode of the organic light emitting diode, and a gate thereof is connected to a first node; the storage capacitor is connected between a first power supply and a first node.
3. The organic light emitting display of claim 2, wherein the compensation circuit further comprises: a third transistor and a fifth transistor; the third transistor is connected between the data line and the source electrode of the fourth transistor, and the grid electrode of the third transistor is connected to the second control line; the fourth transistor is connected between the second node and the drain of the third transistor, and the grid electrode of the fourth transistor is connected to the second node; the fifth transistor is connected between a third power supply and a second node, and a gate thereof is connected to a first control line.
4. The organic light emitting display of claim 3, wherein the fourth transistor has the same threshold voltage as the driving transistor.
5. The organic light emitting display of claim 3, wherein the third power source is a low level voltage source for providing an initialization voltage.
6. The organic light emitting display of claim 3, wherein the current supplied to the organic light emitting diode by the driving transistor is determined by a data voltage supplied by the data line and a first power voltage supplied by the first power supply, independently of a second power voltage supplied by the second power supply and a driving transistor threshold voltage.
7. The organic light emitting display of claim 1, wherein the pixel units connected to the same data line share the same compensation circuit.
8. The organic light emitting display of claim 1, wherein all pixel cells share the same compensation circuit.
9. A method of driving an organic light emitting display according to any one of claims 1 to 8, wherein the scanning period comprises a first period, a second period and a third period, wherein,
initializing a pixel unit of an organic light emitting display in a first time period, wherein a plurality of pixel units of the organic light emitting display share at least one compensation circuit;
writing a data signal into the pixel unit in a second time period, and simultaneously sampling the threshold voltage of the driving transistor of the pixel unit;
in a third period, the pixel unit displays an image by emitting light having a luminance corresponding to the data signal.
10. The driving method of an organic light emitting display according to claim 9,
in a first time period, a scanning signal provided by a scanning line is at a low level, a control signal provided by a first control line is changed from a high level to a low level, a control signal provided by a second control line is at a high level, and a data signal provided by a data line is at a high level;
in a second time period, the scanning signal provided by the scanning line keeps low level, the control signal provided by the second control line changes from high level to low level, the control signal provided by the first control line is high level, and the data signal provided by the data line is low level;
in the third time period, the scanning signal provided by the scanning line is changed from low level to high level, the control signals provided by the first control line and the second control line are kept at high level, and the data signal provided by the data line is at high level.
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| TWI662533B (en) * | 2018-05-04 | 2019-06-11 | 友達光電股份有限公司 | Display panel |
| CN108806612B (en) * | 2018-06-13 | 2020-01-10 | 京东方科技集团股份有限公司 | Pixel circuit, driving method thereof and display device |
| TWI683296B (en) * | 2018-11-19 | 2020-01-21 | 友達光電股份有限公司 | Display panel |
| TWI708230B (en) * | 2018-11-20 | 2020-10-21 | 友達光電股份有限公司 | Display panel |
| WO2020133240A1 (en) * | 2018-12-28 | 2020-07-02 | 深圳市柔宇科技有限公司 | Display screen and display device |
| CN113140183B (en) * | 2020-01-19 | 2022-06-10 | 北京小米移动软件有限公司 | OLED display screen display control method and device and storage medium |
| TWI725768B (en) * | 2020-03-12 | 2021-04-21 | 友達光電股份有限公司 | Light emitting element driving circuit and related display panel |
| CN111564140B (en) * | 2020-06-12 | 2021-03-26 | 京东方科技集团股份有限公司 | Display substrate and display device |
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