CN106205489A - OLED and driving method thereof - Google Patents
OLED and driving method thereof Download PDFInfo
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- CN106205489A CN106205489A CN201610866371.7A CN201610866371A CN106205489A CN 106205489 A CN106205489 A CN 106205489A CN 201610866371 A CN201610866371 A CN 201610866371A CN 106205489 A CN106205489 A CN 106205489A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- Control Of El Displays (AREA)
- Electroluminescent Light Sources (AREA)
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Abstract
The invention provides a kind of OLED and driving method thereof, wherein, described OLED includes scan line, data wire and multiple pixel cell arranged in matrix, and each pixel cell is connected with scan line and data wire；Wherein, described data wire is for providing data signal and initializing signal respectively.In the OLED and driving method thereof of present invention offer, data wire is utilized to provide initializing signal and data signal respectively, therefore without being provided for transmitting the reference power source cabling of initializing signal, thus avoid reference power source cabling to take the area of image element circuit, which thereby enhance the pixel resolution of OLED.
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
In recent years, with the rapid development and application of information technology, wireless mobile communication and information appliances, people have increasingly depended on electronic products, and various display technologies and display devices have been developed. Among them, the flat panel display device has advantages of complete planarization, lightness, thinness, power saving, etc., and thus is widely used in various consumer electronic products such as mobile phones, televisions, personal digital assistants, digital cameras, notebook computers, desktop computers, etc., and becomes the mainstream of the display device.
An Organic light Emitting display is a flat panel display device that displays images by controlling Organic Light Emitting Diodes (OLEDs) using Thin Film Transistors (TFTs), and has a display mode that is different from a display mode of Thin Film Transistor liquid crystal displays (TFTs-LCDs), does not require a backlight, and has advantages of high contrast, fast response speed, light weight, and the like. Accordingly, the organic light emitting display is known as a new generation of flat panel display device that can replace the thin film transistor liquid crystal display.
An existing organic light emitting display generally includes a plurality of scan lines for supplying scan signals, a plurality of data lines for supplying video data signals, and a plurality of pixels arranged to cross the plurality of scan lines and the plurality of data lines, the plurality of pixels being arranged in a matrix form in crossing regions of the plurality of scan lines and the plurality of data lines, each pixel being connected to the scan lines and the data lines, and a pixel unit including an organic light emitting diode OLED and a pixel circuit for driving the organic light emitting diode OLED.
During operation of an organic light emitting display, it is generally necessary to initialize the pixel circuits. Therefore, a reference power trace is generally disposed in an existing pixel circuit, the pixel circuit is connected to an external reference power via the reference power trace, and an initialization signal provided by the reference power is used to initialize the pixel circuit.
With the development of flat panel display technology, the market demands for large-sized and high-resolution flat panel display devices are increasing. Also, large-sized, high-resolution organic light emitting displays are becoming increasingly popular in the market. However, in the conventional pixel circuit, the reference power trace occupies a large area, and thus, the improvement of the pixel resolution is adversely affected.
Therefore, how to solve the problem that the resolution of the conventional organic light emitting display is affected by the fact that the reference power supply wire occupies the area of the pixel circuit 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 resolution of the conventional organic light emitting display is affected due to the fact that the reference power trace occupies the area of the pixel circuit.
To solve the above problems, the present invention provides an organic light emitting display including: the pixel unit comprises a scanning line, a data line and a plurality of pixel units arranged in a matrix manner, wherein each pixel unit is connected with the scanning line and the data line;
the data lines are used for respectively providing data signals and initialization signals.
Alternatively, in the organic light emitting display, the data signal and the initialization signal are present in an alternating pattern.
Optionally, in the organic light emitting display, the pixel unit includes an organic light emitting diode and a pixel circuit; the pixel circuit is connected to the organic light emitting diode for controlling a driving current supplied to the organic light emitting diode.
Optionally, in the organic light emitting display, the pixel circuit includes a first transistor and a second transistor, and the data line is connected to sources of the first transistor and the second transistor, and is configured to provide a data signal and an initialization signal, respectively.
Optionally, in the organic light emitting display, the scan lines include a first scan signal line and a second scan signal line;
the first scanning signal line is connected with the grid electrode of the first transistor and is used for controlling initialization;
the second scanning signal line is connected with the grid electrode of the second transistor and used for controlling the writing of data signals.
Optionally, in the organic light emitting display, the first scanning signal line and the second scanning signal line are arranged in parallel.
Accordingly, the present invention also provides a driving method of an organic light emitting display, the driving method of the organic light emitting display including: the drive cycle includes a first period of time and a second period of time, wherein,
in a first time period, a first scanning signal provided by a first scanning signal line is at a low level, a second scanning signal provided by a second scanning signal line is at a high level, and an initialization signal is written into the pixel circuit through the data line;
in the second period, the first scanning signal supplied from the first scanning signal line is at a high level, the second scanning signal supplied from the second scanning signal line is at a low level, and the data signal is written into the pixel circuit through the data line.
Optionally, in the driving method of the organic light emitting display, the driving cycle further includes a third period, and the third period is between the first period and the second period;
in a third period, the first scanning signal supplied from the first scanning signal line and the second scanning signal supplied from the second scanning signal line are both at a high level, and writing of the initialization signal into the pixel circuit is stopped.
Optionally, in the driving method of the organic light emitting display, voltages of the initialization signals applied to each row of pixel units are not equal.
Optionally, in the driving method of the organic light emitting display, a voltage difference between the data signal and the initialization signal is greater than a threshold voltage of any one transistor.
In the organic light emitting display and the driving method thereof provided by the invention, the data lines are used for respectively providing the initialization signal and the data signal, so that a reference power supply wire for transmitting the initialization signal is not required to be arranged, the reference power supply wire is prevented from occupying the area of a pixel circuit, and the pixel resolution of the organic light emitting display is improved.
Drawings
Fig. 1 is a schematic view of a partial structure of an organic light emitting display according to an embodiment of the present invention;
fig. 2 is a timing diagram of a driving method of an organic light emitting display according to an embodiment of the present invention;
fig. 3 is a timing diagram of a driving method of an organic light emitting display according to another 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.
Please refer to fig. 1, which is a schematic diagram of a partial structure of an organic light emitting display according to an embodiment of the present invention. As shown in fig. 1, the organic light emitting display 100 includes: scanning lines (Scan1, Scan2), Data lines Data and a plurality of pixel units 20 arranged in a matrix, wherein each pixel unit 20 is connected with the scanning lines (Scan1, Scan2) and the Data lines Data; the Data lines Data are used for respectively providing Data signals and initialization signals.
Specifically, each pixel unit includes an organic light emitting diode OLED and a pixel circuit, the pixel circuit is connected to an anode of the organic light emitting diode OLED, a cathode of the organic light emitting diode OLED is grounded, and the pixel circuit is configured to control a driving current supplied to the organic light emitting diode OLED. With continued reference to fig. 1, the pixel circuit includes a first transistor T1 and a second transistor T2, the first Scan signal line Scan1 is connected to the gate of the first transistor T1 for controlling initialization of the anode voltage of the organic light emitting diode OLED, the second Scan signal line Scan2 is connected to the gate of the second transistor T2 for controlling writing of a Data signal, the first Scan signal line and the second Scan signal line are disposed in parallel, and the Data line Data is connected to the sources of the first transistor T1 and the second transistor T2 for respectively providing a Data signal and an initialization signal.
In this embodiment, the pixel circuit is a 6T1C type circuit structure, and includes 6 transistors and 1 capacitor, where one transistor is a driving transistor. However, the circuit structure of the pixel circuit is not limited to this, and the pixel circuit may be a circuit structure of 6T2C type, a circuit structure of 7T1C type, or other types of circuit structures in other embodiments.
The transistors of the pixel circuit are all thin film transistors, and the thin film transistors can be P-type thin film transistors or N-type thin film transistors. As is known, the P-type tft is turned on when the gate signal is at a low level, and the N-type tft is turned on when the gate signal is at a high level. Therefore, it is sufficient to match the selected transistor type with the on potential. In this embodiment, the transistors of the pixel circuit are all P-type thin film transistors. In this embodiment, the signal Vdata supplied from the Data line Data includes an initialization signal and a Data signal, which occur in an alternating manner. Wherein a voltage difference between the data signal and the initialization signal is required to be greater than a threshold voltage of a transistor.
Since the first transistor T1 controlled by the first Scan signal line Scan1 and the second transistor T2 controlled by the second Scan signal line Scan2 are both connected to the Data line Data, when the first transistor T1 controlled by the first Scan signal line Scan1 is turned on, an initialization signal supplied from the Data line Data is supplied to the pixel circuit via the first transistor T1, and when the second transistor T2 controlled by the second Scan signal line Scan2 is turned on, a Data signal supplied from the Data line Data is supplied to the pixel circuit via the second transistor T2.
In the organic light emitting display 100, since the Data line Data can provide an initialization signal, the pixel circuit does not need to receive an initialization signal from an external reference power source, and a reference power source trace does not need to be provided in the pixel circuit. Thereby, the pixel resolution of the organic light emitting display 100 is improved.
Correspondingly, the invention also provides a driving method of the organic light emitting display. Referring to fig. 1 and fig. 2 in combination, the driving method of the organic light emitting display includes: the driving period includes a first period t1 and a second period t 2; wherein,
in the first period t1, the first Scan signal supplied from the first Scan signal line Scan1 is at a low level, the second Scan signal supplied from the second Scan signal line Scan2 is at a high level, and the initialization signal is written into the pixel circuit through the Data line Data;
in the second period t2, the first Scan signal supplied from the first Scan signal line Scan1 is at a high level, the second Scan signal supplied from the second Scan signal line Scan2 is at a low level, and the Data signal is written in the pixel circuit through the Data line Data.
Specifically, the following describes a driving method of the organic light emitting display in detail by taking a driving process of the first row of pixel units as an example.
In the first period T1, since the first Scan signal provided by the first Scan signal line Scan1-1 of the first row of pixel cells is at a low level, the first transistor T1 controlled by the first Scan signal is in a conducting state, and thus the initialization signal provided by the Data line Data is written into the pixel circuit through the first transistor T1. Therefore, the first period t1 is an initialization signal writing time. The signal supplied by the Data line Data at this time is an initialization signal.
In the second period T2, since the second Scan signal supplied from the second Scan signal line Scan2-1 of the pixel cells in the first row is at a low level, the second transistor T2 controlled by the second Scan signal is in a turned-on state, and thus a signal supplied from the Data line Data is written into the pixel circuit via the second transistor T2. Therefore, the second time period t2 is a data signal writing time. At this time, the signal provided by the Data line Data is a Data signal.
As shown in fig. 2, the voltage of the data signal is relatively high, the voltage of the initialization signal is relatively low, and the voltage difference between the data signal and the initialization signal is greater than the threshold voltage of any transistor.
The driving cycle further includes a third time period t3, the third time period t3 being disposed between the first time period t1 and the second time period t 2. In the third period T3, the first Scan signal supplied from the first Scan signal line Scan1-1 changes from low level to high level, the second Scan signal supplied from the second Scan signal line Scan2-1 is high level, and both the first transistor T1 controlled by the first Scan signal and the second transistor T2 controlled by the second Scan signal are in an off state. Accordingly, the writing of the initialization signal is stopped for the third time period t 3. At this time, the signal supplied from the Data line Data is at a low level.
The working processes of the first time period t1, the third time period t3 and the second time period t2 are repeated to complete the image display function.
The driving process of the second row of pixel cells is similar to the driving process of the first row of pixel cells. As shown in fig. 2, at the time of writing the initialization signal of the pixel units in the second row, the first Scan signal supplied from the first Scan signal line Scan1-2 of the pixel units in the second row is at a low level, while the second Scan signal supplied from the second Scan signal line Scan2-2 of the pixel units in the second row is at a high level, at the time of writing the data signal of the pixel units in the second row, the first Scan signal supplied from the first Scan signal line Scan1-2 of the pixel units in the second row is at a high level, and the second Scan signal supplied from the second Scan signal line Scan2-2 of the pixel units in the second row is at a low level.
In this embodiment, the initialization signal is a fixed voltage signal, that is, the voltages of the initialization signals applied to each row of pixels are all equal. As shown in fig. 2, the voltage of the initialization signal of the first row of pixel units is equal to the voltage of the initialization signal of the second row of pixel units.
In other embodiments, the initialization signal may not be a fixed voltage signal, i.e., the voltages of the initialization signals applied to each row of pixel units are not equal. As shown in fig. 3, the voltage of the initialization signal of the first row of pixel units is greater than the voltage of the initialization signal of the second row of pixel units.
The data voltages of the pixel units in each row are set according to actual needs, and may be equal or unequal. The driving processes of the pixel units in other rows are similar to the driving process of the pixel units in the first row, and are not described herein again.
In summary, in the organic light emitting display and the driving method thereof provided by the present invention, the data lines are used for providing the initialization signal and the data signal, respectively, so that a reference power trace for transmitting the initialization signal is not required to be provided, thereby avoiding the reference power trace occupying the area of the pixel circuit, and thus improving the pixel 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 array comprises a scanning line, a data line and a plurality of pixel units arranged in a matrix manner, wherein each pixel unit is connected with the scanning line and the data line;
the data lines are used for respectively providing data signals and initialization signals.
2. The organic light emitting display of claim 1, wherein the data signal and the initialization signal occur in an alternating fashion.
3. The organic light emitting display of claim 1, wherein the pixel unit includes an organic light emitting diode and a pixel circuit; the pixel circuit is connected to the organic light emitting diode for controlling a driving current supplied to the organic light emitting diode.
4. The organic light emitting display of claim 3, wherein the pixel circuit comprises a first transistor and a second transistor, and the data line is connected to sources of the first transistor and the second transistor for providing a data signal and an initialization signal, respectively.
5. The organic light emitting display according to claim 4, wherein the scan line includes a first scan signal line and a second scan signal line;
the first scanning signal line is connected with the grid electrode of the first transistor and is used for controlling initialization;
the second scanning signal line is connected with the grid electrode of the second transistor and used for controlling the writing of data signals.
6. The organic light emitting display of claim 5, wherein the first scan signal line and the second scan signal line are disposed in parallel.
7. A method of driving an organic light emitting display according to any one of claims 1 to 6, wherein the driving period comprises a first period and a second period, wherein,
in a first time period, a first scanning signal provided by a first scanning signal line is at a low level, a second scanning signal provided by a second scanning signal line is at a high level, and an initialization signal is written into the pixel circuit through the data line;
in the second period, the first scanning signal supplied from the first scanning signal line is at a high level, the second scanning signal supplied from the second scanning signal line is at a low level, and the data signal is written into the pixel circuit through the data line.
8. The method of driving an organic light emitting display according to claim 7, wherein the driving period further includes a third period of time, the third period of time being provided between the first period of time and the second period of time;
in a third period, the first scanning signal supplied from the first scanning signal line and the second scanning signal supplied from the second scanning signal line are both at a high level, and writing of the initialization signal into the pixel circuit is stopped.
9. The method of driving the organic light emitting display of claim 7, wherein voltages of the initialization signals applied to each row of pixel cells are not equal.
10. The method of claim 7, wherein a voltage difference between the data signal and the initialization signal is greater than a threshold voltage of any one of the transistors.
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| CN201610866371.7A CN106205489A (en) | 2016-09-30 | 2016-09-30 | OLED and driving method thereof |
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| CN201610866371.7A CN106205489A (en) | 2016-09-30 | 2016-09-30 | OLED and driving method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024187829A1 (en) * | 2023-03-15 | 2024-09-19 | 合肥维信诺科技有限公司 | Pixel circuits, drive method therefor and display panel |
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Application publication date: 20161207 |