CN103268753A - AMOLED drive circuit sharing scanning lines and driving method thereof - Google Patents
AMOLED drive circuit sharing scanning lines and driving method thereof Download PDFInfo
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Abstract
The invention provides an AMOLED drive circuit sharing scanning lines and a driving method thereof. The drive circuit at least comprises a two-dimensional pixel matrix, a scan driver, a data driver, a select driver and a control circuit. The two-dimensional pixel matrix is composed of pixel units with the number of M*N; the scan driver outputs at least one scanning line, and every two lines of pixel units in the two-dimensional pixel matrix share one scanning line; the data driver outputs at least one data line, and each data line is connected with a corresponding line of pixel units; the select driver outputs a first select line and a second select line, the first select line is connected with odd-numbered line pixel units in the two-dimensional pixel matrix, and the second select line is connected with even-numbered line pixel units in the two-dimensional pixel matrix; the control unit is connected with the scan driver, the data driver and the select driver respectively. According to the AMOLED drive circuit sharing the scanning lines, every two lines of pixel units share one scanning line, the scale of the scanning lines is changed to be half of an original scale, and the number of driving ICs is obviously reduced.
Description
Technical field
The present invention relates to display technique field, plane, particularly relate to AMOLED driving circuit and driving method thereof that a kind of sweep trace shares.
Background technology
Than liquid crystal display (LCD), Organic Light Emitting Diode (OLED) is because its thickness is little, and quality is light, and pliability is good, and is no backlight, response soon, characteristics such as energy consumption is low become the developing direction of following display technique gradually.
The OLED display is formed by many light emitting members, and each pixel comprises the electronic circuit for the control light emitting diode.Pixel cell constitutes display system with the form of row and column, and the data value that utilizes renewal to represent monochrome information comes each pixel of array is programmed.
In the 2-TFT of prior art type active matrix organic light-emitting diode (AMOLED) pixel, adopt voltage form that the data value of determining light intensity is provided from the outside.Described voltage is transformed to electric current by OLED by image element circuit, and size of current determines the size of luminous intensity.When OLED was programmed, thin film transistor (TFT) (TFT) sent to another transistorized grid with data value voltage from line program, and described transistor is used for regulating the electric current that flow to OLED from power supply.
Accompanying drawing l is depicted as the driving circuit of the AMOELD of 2-TFT structure, and pixel cell is connected to sweep trace Scan, data line Data and power lead VDD.This pixel comprises switching thin-film transistor Nl, drives thin film transistor (TFT) N2, capacitor Cs and Organic Light Emitting Diode OLED.The grid of switching thin-film transistor Nl is connected to sweep trace Scan, and the source electrode of switching thin-film transistor Nl is connected to data line Data.The electrode of capacitor Cs is connected to the drain electrode of switching thin-film transistor Nl, and another electrode of capacitor Cs is connected to GND.The drain electrode that drives thin film transistor (TFT) N2 is connected to the negative electrode of Organic Light Emitting Diode OLED, and the grid that drives thin film transistor (TFT) N2 is connected to the drain electrode of switching thin-film transistor Nl, and the source electrode of driving thin film transistor (TFT) N2 is connected to GND.
Be the entire block diagram of the AMOLED driving circuit of prior art as Fig. 3, as can be seen from the figure, each row pixel cell only shares a sweep trace in this driving circuit, and each row pixel cell shares a data line.At present, OLED shows that the direction of using towards big face battle array, high resolving power and small size develops.Along with the expansion of pixel scale, the quantity of needed signal wire and drive IC also can sharply increase, and this has brought very big burden for the control of total system.Therefore, the present invention proposes AMOLED driving circuit and driving method thereof that a kind of sweep trace shares, further reduce the quantity of sweep trace.
Summary of the invention
The shortcoming of prior art the object of the present invention is to provide a kind of sweep trace shared AMOLED driving circuit and driving method thereof in view of the above, is used for solving the many problems of prior art AMOLED driving circuit sweep trace.
Reach other relevant purposes for achieving the above object, the invention provides the AMOLED driving circuit that a kind of sweep trace shares, described driving circuit comprises at least:
Two-dimensional pixel matrix is made of M * N pixel cell, and M represents the line number of two-dimensional matrix, and N represents the columns of two-dimensional matrix;
Scanner driver is exported at least one sweep trace, and per two row pixel cells share a sweep trace in the described two-dimensional pixel matrix;
Data driver is exported at least one data line, and every data line connects with a corresponding row pixel cell;
Select driver, output first selects line and second to select line, and described first selects line to be connected with odd-numbered line pixel cell in the described two-dimensional pixel matrix, and described second selects line to be connected with even number line pixel cell in the described two-dimensional pixel matrix;
Control module links to each other respectively with described scanner driver, data driver and selection driver, is used for the described scanner driver of control, data driver and selects the sequential of driver to export.
Preferably, described driving circuit also comprises power supply, exports at least one power lead, and every power lead connects with a corresponding row pixel cell.
Preferably, described each pixel cell comprises: light emitting diode, drive thin film transistor (TFT), switching thin-film transistor, gating thin film transistor (TFT), and capacitor;
The positive pole of described light emitting diode links to each other with power lead, and the negative pole of light emitting diode links to each other with the drain electrode of described driving thin film transistor (TFT);
The grid of described driving thin film transistor (TFT) links to each other with the drain electrode of described switching thin-film transistor;
The source electrode of described switching thin-film transistor links to each other with described data line, and the grid of described switching thin-film transistor links to each other with the source electrode of described gating thin film transistor (TFT);
The grid of described gating thin film transistor (TFT) links to each other with described selection line, and the drain electrode of described gating thin film transistor (TFT) links to each other with sweep trace;
One end of described capacitor links to each other with the grid of described driving thin film transistor (TFT), and the other end links to each other and ground connection with the source electrode that drives thin film transistor (TFT).
Preferably, described light emitting diode is Organic Light Emitting Diode.
Preferably, described driving thin film transistor (TFT) is that N-type drives thin film transistor (TFT), and described switching thin-film transistor is the N-type switching thin-film transistor, and described gating thin film transistor (TFT) is N-type gating thin film transistor (TFT).
The present invention also provides the driving method of the shared AMOLED driving circuit of a kind of sweep trace, and described driving method comprises step at least:
Under the control of control module, the sweep trace of gated sweep driver output;
If gating selects first of driver to select line, then an odd-numbered line pixel cell corresponding in the two-dimensional pixel matrix is programmed, the data line information of data driver output is saved in the odd-numbered line pixel cell of described correspondence, makes the odd-numbered line pixel cell luminous;
If gating selects second of driver to select line, then an even number line pixel cell corresponding in the two-dimensional pixel matrix is programmed, the data line information of data driver output is saved in the even number line pixel cell of described correspondence, makes the even number line pixel cell luminous.
Preferably, the data line information of data driver output is saved in the capacitor of described every capable pixel cell.
Preferably, described pixel cell is luminous is to be finished by the light emitting diode in the pixel cell.
Preferably, described light emitting diode is Organic Light Emitting Diode.
As mentioned above, AMOLED driving circuit and driving method thereof that sweep trace of the present invention shares, has following beneficial effect: adopt per two row pixel cells to share a sweep trace, make the sum of sweep trace reduce half, also reduced simultaneously scale and the area of drive IC, this driving circuit can be applied in large tracts of land, high resolving power and the undersized display system better.
Description of drawings
Fig. 1 is the AMOLED driving circuit synoptic diagram of prior art.
Fig. 2 is the sequential chart that is applied to sweep signal, data-signal and power supply signal on the pixel cell of Fig. 1.
Fig. 3 is the driving circuit entire block diagram that each row pixel cell shares a sweep trace in the prior art.
Fig. 4 is the entire block diagram of AMOLED driving circuit of the present invention.
Fig. 5 is the electrical block diagram of AMOLED driving circuit of the present invention.
Fig. 6 is selection signal, sweep signal and the data-signal sequential chart that is applied on the pixel cell of Fig. 5.
The element numbers explanation
Embodiment
Below by specific instantiation explanation embodiments of the present invention, those skilled in the art can understand other advantages of the present invention and effect easily by the disclosed content of this instructions.The present invention can also be implemented or be used by other different embodiment, and the every details in this instructions also can be based on different viewpoints and application, carries out various modifications or change under the spirit of the present invention not deviating from.
See also accompanying drawing.Need to prove, the diagram that provides in the present embodiment only illustrates basic conception of the present invention in a schematic way, satisfy only show in graphic with the present invention in relevant assembly but not component count, shape and size drafting when implementing according to reality, kenel, quantity and the ratio of each assembly can be a kind of random change during its actual enforcement, and its assembly layout kenel also may be more complicated.
Embodiment one
As shown in Figure 4, the invention provides the AMOLED driving circuit that a kind of sweep trace shares, this driving circuit comprises at least: two-dimensional pixel matrix 1, scanner driver 2, data driver 3, selection driver 4 and control module 5.
Described two-dimensional pixel matrix 1 is to be made of M * N pixel cell, and wherein, M represents the line number of two-dimensional matrix, and N represents the columns of two-dimensional matrix.
As a kind of optimizing structure of the present invention, in the described two-dimensional pixel matrix 1 each pixel cell by light emitting diode 11, drive thin film transistor (TFT) 12, switching thin-film transistor 13, gating thin film transistor (TFT) 14, and capacitor 15 form, be illustrated in figure 5 as the driving circuit figure with four lines one row matrix of pixel cells.
Wherein, the negative pole of described light emitting diode 11 links to each other with the drain electrode of described driving thin film transistor (TFT) 12, the grid of described driving thin film transistor (TFT) 12 links to each other with the drain electrode of described switching thin-film transistor 13, the grid of described switching thin-film transistor 13 links to each other with the source electrode of described gating thin film transistor (TFT) 14, one end of described capacitor 15 links to each other with the grid of described driving thin film transistor (TFT) 12, and the other end links to each other and ground connection with the source electrode that drives thin film transistor (TFT) 12.
In the present embodiment, described light emitting diode 11 is Organic Light Emitting Diode, certainly, in other embodiments, also can be the light emitting diode of other types.
In the present embodiment, described driving thin film transistor (TFT) 12 drives thin film transistor (TFT) for N-type, and described switching thin-film transistor 13 is the N-type switching thin-film transistor, and described gating thin film transistor (TFT) 14 is N-type gating thin film transistor (TFT).Certainly, in other embodiments, drive thin film transistor (TFT) 12, switching thin-film transistor 13 and gating thin film transistor (TFT) 14 and also can be corresponding P type thin film transistor (TFT).
Described scanner driver 2 is used for output at least one sweep trace 21, and per two row pixel cells share a sweep trace 21 in the described two-dimensional pixel matrix 1.Particularly, the drain electrode of the gating thin film transistor (TFT) 14 in described sweep trace 21 and each pixel cell links to each other.
Described data driver 3 is used for output at least one data line 31, every data line 31 and corresponding row pixel cell connection.Particularly, the source electrode of the switching thin-film transistor 13 in described data line 31 and the pixel cell links to each other.
Described selection driver 4 is used for output first and selects line 41 and second to select line 42, described first selects line 41 to be connected with odd-numbered line pixel cell in the described two-dimensional pixel matrix 1, and described second selects line 42 to be connected with even number line pixel cell in the described two-dimensional pixel matrix 1.Particularly, the grid of the gating thin film transistor (TFT) 14 in described selection line and each pixel cell links to each other.Further, described first selects line 41 to link to each other with the grid of gating thin film transistor (TFT) 14 in the odd-numbered line pixel cell, and described second selects line 42 to link to each other with the grid of gating thin film transistor (TFT) 14 in the even number line pixel cell.
Described control module 5 is with described scanner driver 2, data driver 3 and select driver 4 to link to each other respectively, is used for the described scanner driver 2 of control, data driver 3 and selects the sequential of driver 4 to export.
In addition, described driving circuit also comprises power supply, and this power supply is used for output at least one power lead, and power lead provides DC voltage VDD to described pixel cell, as shown in Figure 5, and every power lead and corresponding row pixel cell connection.Concrete, described power lead links to each other with the positive pole of light emitting diode 11 in each pixel cell.
Embodiment two
The invention provides the driving method of the shared AMOLED driving circuit of a kind of sweep trace, be used for driving the driving circuit of embodiment one, this driving method comprises step at least:
Under the control of control module 5, the sweep trace 21 of gated sweep driver 2 outputs;
If gating selects first of driver 4 to select line 41, then an odd-numbered line pixel cell corresponding in the two-dimensional pixel matrix 1 is programmed, the data line information of data driver 3 outputs is saved in the odd-numbered line pixel cell of described correspondence, makes the odd-numbered line pixel cell luminous;
If gating selects second of driver 4 to select line 42, then an even number line pixel cell corresponding in the two-dimensional pixel matrix 1 is programmed, the data line information of data driver 3 outputs is saved in the even number line pixel cell of described correspondence, makes the even number line pixel cell luminous.
In the present embodiment, be selection signal, sweep signal and the data-signal sequential chart that is applied on the pixel cell of Fig. 5 as Fig. 6, driving as shown in Figure 5, the driving method of circuit comprises step:
At first, as the H1 time period among Fig. 6, sweep trace SCAN (n) gating with scanner driver output, namely export high level, first select line SEL1 gating simultaneously, second selects line SEL2 to disconnect, and the first pixel cell P1 is programmed, and the data line information D 1 of described data driver output is stored among the first pixel cell P1;
Then, as the H2 time period among Fig. 6, sweep trace SCAN (n) is constant, first selects line SEL1 to disconnect, second selects line SEL2 gating, and the second pixel cell P2 is programmed, and the data line information D 2 of described data driver output is stored among the second pixel cell P2;
Then, as the H3 time period among Fig. 6, sweep trace SCAN (n+1) gating with scanner driver output, namely export high level, first select line SEL1 gating simultaneously, second selects line SEL2 to disconnect, and the 3rd pixel cell P3 is programmed, and the data line D3 information of described data driver output is stored among the 3rd pixel cell P3;
At last, as the H4 time period among Fig. 6, sweep trace SCAN (n+1) is constant, first selects line SEL1 to disconnect, second selects line SEL2 gating, and the 4th pixel cell P4 is programmed, and the data line D4 information of described data driver output is stored among the 4th pixel cell P4.
Concrete, the data line information of described data driver output is stored in the capacitor 15 of every capable pixel cell, and afterwards, corresponding pixel cell begins luminous immediately, and described pixel cell is luminous to be to be finished by the light emitting diode 11 in the pixel cell.In the present embodiment, described light emitting diode 11 is Organic Light Emitting Diode.
Need to prove that the pixel cell of present embodiment is four lines one row, certainly, if the capable pixel cell of M is arranged, then by above-mentioned steps, the capable pixel cell of M in described two-dimensional pixel matrix is luminous.
In sum, the invention provides AMOLED driving circuit and driving method thereof that a kind of sweep trace shares, this driving circuit is to adopt per two row pixel cells to share a sweep trace, make the sum of sweep trace reduce half, also reduced simultaneously scale and the area of drive IC, this driving circuit can be applied in large tracts of land, high resolving power and the undersized display system better.
So the present invention has effectively overcome various shortcoming of the prior art and the tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not is used for restriction the present invention.Any person skilled in the art scholar all can be under spirit of the present invention and category, and above-described embodiment is modified or changed.Therefore, have in the technical field under such as and know that usually the knowledgeable modifies or changes not breaking away from all equivalences of finishing under disclosed spirit and the technological thought, must be contained by claim of the present invention.
Claims (9)
1. the AMOLED driving circuit that shares of a sweep trace is characterized in that described driving circuit comprises at least:
Two-dimensional pixel matrix is made of M * N pixel cell, and M represents the line number of two-dimensional matrix, and N represents the columns of two-dimensional matrix;
Scanner driver is exported at least one sweep trace, and per two row pixel cells share a sweep trace in the described two-dimensional pixel matrix;
Data driver is exported at least one data line, and every data line connects with a corresponding row pixel cell;
Select driver, output first selects line and second to select line, and described first selects line to be connected with odd-numbered line pixel cell in the described two-dimensional pixel matrix, and described second selects line to be connected with even number line pixel cell in the described two-dimensional pixel matrix;
Control module links to each other respectively with described scanner driver, data driver and selection driver, is used for the described scanner driver of control, data driver and selects the sequential of driver to export.
2. the AMOLED driving circuit that shares of sweep trace according to claim 1, it is characterized in that: described driving circuit also comprises power supply, exports at least one power lead, every power lead and corresponding row pixel cell connection.
3. the AMOLED driving circuit that shares of sweep trace according to claim 1, it is characterized in that: described each pixel cell comprises: light emitting diode, drive thin film transistor (TFT), switching thin-film transistor, gating thin film transistor (TFT), and capacitor;
The positive pole of described light emitting diode links to each other with power lead, and the negative pole of light emitting diode links to each other with the drain electrode of described driving thin film transistor (TFT);
The grid of described driving thin film transistor (TFT) links to each other with the drain electrode of described switching thin-film transistor;
The source electrode of described switching thin-film transistor links to each other with described data line, and the grid of described switching thin-film transistor links to each other with the source electrode of described gating thin film transistor (TFT);
The grid of described gating thin film transistor (TFT) links to each other with described selection line, and the drain electrode of described gating thin film transistor (TFT) links to each other with sweep trace;
One end of described capacitor links to each other with the grid of described driving thin film transistor (TFT), and the other end links to each other and ground connection with the source electrode that drives thin film transistor (TFT).
4. the AMOLED driving circuit that shares of sweep trace according to claim 3, it is characterized in that: described light emitting diode is Organic Light Emitting Diode.
5. the AMOLED driving circuit that shares of sweep trace according to claim 3, it is characterized in that: described driving thin film transistor (TFT) is that N-type drives thin film transistor (TFT), described switching thin-film transistor is the N-type switching thin-film transistor, and described gating thin film transistor (TFT) is N-type gating thin film transistor (TFT).
6. the driving method of the AMOLED driving circuit that shares of a sweep trace is characterized in that described driving method comprises step at least:
Under the control of control module, the sweep trace of gated sweep driver output;
If gating selects first of driver to select line, then an odd-numbered line pixel cell corresponding in the two-dimensional pixel matrix is programmed, the data line information of data driver output is saved in the odd-numbered line pixel cell of described correspondence, makes the odd-numbered line pixel cell luminous;
If gating selects second of driver to select line, then an even number line pixel cell corresponding in the two-dimensional pixel matrix is programmed, the data line information of data driver output is saved in the even number line pixel cell of described correspondence, makes the even number line pixel cell luminous.
7. the driving method of the AMOLED driving circuit that shares of sweep trace according to claim 6, it is characterized in that: the data line information of data driver output is saved in the capacitor of described every capable pixel cell.
8. the driving method of the AMOLED driving circuit that shares of sweep trace according to claim 6, it is characterized in that: described pixel cell is luminous to be to be finished by the light emitting diode in the pixel cell.
9. the driving method of the AMOLED driving circuit that shares of sweep trace according to claim 8, it is characterized in that: described light emitting diode is Organic Light Emitting Diode.
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