CN104934459A - Organic light-emitting diode display device and driving method thereof - Google Patents
Organic light-emitting diode display device and driving method thereof Download PDFInfo
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Abstract
The invention provides an organic light-emitting diode display device and a driving method thereof. The display device comprises a display panel, m scanning lines, n first control lines, n second control lines and a compensation driving circuit. The display panel is provided with a plurality of pixel units. Each pixel unit is provided with a compensating circuit. The pixel units are arranged in m lines, and furthermore the pixel units of the lines are divided into n groups. The scanning lines are arranged correspondingly with the pixel units of the lines and are electrically connected with the pixel units. The first control lines and the second control lines are arranged correspondingly with the groups, and are electrically connected with the pixel units of the corresponding groups; wherein (m/n) is a positive integer and 2<=(m/n)<m. The compensation driving circuit is electrically connected with the pixel units through the scanning lines, the first control lines and the second control lines. The organic light-emitting diode display device and the driving method can reduce usage amount of scanning signal lines and driving ICs thereof and furthermore prevent display picture flashing.
Description
Technical field
The present invention about a kind of display unit and driving method thereof, especially in regard to a kind of organic LED display device and driving method thereof.
Background technology
The advantages such as flat display apparatus (flat display apparatus) is low with its power consumption, caloric value is few, lightweight and non-radiation type, be used in electronic product miscellaneous, and little by little replace traditional cathode ray tube (cathode ray tube, CRT) display unit.Flat display apparatus generally can divide into passive matrix type (passive matrix) and active matrix (active matrix) etc. two kinds according to its type of drive.Passive matrix type display unit is limited to drive pattern, therefore have the life-span shorter with cannot the shortcoming such as large area.And although active matrix display unit cost costly and the shortcoming such as technique is more complicated, be applicable to the true color display of high information capacity of large scale, high-res, therefore, become the main flow of flat display apparatus.Wherein, be one of product of main development in recent years with active organic light-emitting diode (Organic Light-Emitting Diode, OLED) display unit again.
But, be applied in the thin-film transistor making active organic light-emitting diode display unit, because driving the driving transistors possibility of Organic Light Emitting Diode because technique, material ... or the equal factor of element characteristic and cause its critical voltage (threshold voltage, Vth) skew (shift), under indirectly making identical data voltage drive, the drive current of the Organic Light Emitting Diode of each pixel has narrow difference and causes the phenomenon (such as Mura phenomenon) of display frame brightness irregularities.
Therefore, in the prior art, by a kind of pixel compensation circuit, the picture brightness uneven phenomenon caused with the skew of the critical voltage of compensation for drive transistor.In existing pixel compensation, one is called compensation technique in proper order, and compensation technique is in the sequential operation of the thin-film transistor circuit of reality in proper order, and the scanning sequency according to scan line carries out the compensation of pixel item by item to same one-row pixels., this compensation way can cause the signal line of scanning direction to increase, and relatively, the quantity of its drive IC (i.e. Gate Driver) also can increase.
In order to the use amount of the signal line and corresponding drive IC that reduce scanning, another kind of compensation technique all links together compensating desired signal circuit, to carry out disposable compensation to all pixels of whole panel.But this disposable compensation technology can make the time of display frame reduce, and the mean flow rate of display frame is declined, and display frame also easily produce the phenomenon of flicker (Flick).
Therefore, how to provide a kind of organic LED display device and driving method thereof, the use amount of sweep signal circuit and drive IC thereof can be reduced, the flicker of display frame can not be caused again, become one of important topic.
Summary of the invention
The object of this invention is to provide a kind of organic LED display device and driving method thereof, to reduce the use amount of sweep signal circuit and drive IC thereof, also can not cause the flicker of display frame.
Technical scheme of the present invention is to provide a kind of organic LED display device, and it comprises a display floater, m bar scan line, n bar first control line, n bar second control line and a compensation drive circuit.Display floater have multiple pixel cell be configured to by row with row form rectangular, each pixel cell has a compensating circuit, and it is capable that these pixel cells have m, and the pixel cell of these row is divided into n group.These scan lines are corresponding with the pixel cell of these row to be arranged and is electrically connected.These first control lines and these the second control lines are corresponding with these groups respectively arranges, and these first control lines and these the second control lines are electrically connected with these pixel cells of corresponding group respectively, wherein (m/n) is positive integer, and 2≤(m/n) < m.Compensation drive circuit is electrically connected with these pixel cells by these scan lines, these first control lines and these the second control lines.
The present invention also provides a kind of driving method of organic LED display device, organic LED display device comprises a display floater, m bar scan line, n bar first control line, n bar second control line and a compensation drive circuit, these pixel cells be configured to by row with row form rectangular, each pixel cell has a compensating circuit, and compensation drive circuit is electrically connected with these pixel cells by these scan lines, these first control lines and these the second control lines.Driving method comprises: by compensation drive circuit sequentially by these first control lines, these second control lines and these pixel cells of these scanning line driving, wherein to have m capable for these pixel cells, and the pixel cell of these row is divided into n group, these scan lines are corresponding with the pixel cell of these row respectively to be arranged and is electrically connected, these first control lines and these the second control lines are corresponding with these groups respectively arranges, and these first control lines and these the second control lines are electrically connected with these pixel cells of corresponding group respectively, wherein (m/n) is positive integer, and 2≤(m/n) < m.
From the above, because of in organic LED display device of the present invention and driving method thereof, it is capable that these pixel cells have m, and the pixel cell of these row is divided into n group.In addition, these scan lines are corresponding with the pixel cell of these row to be arranged and is electrically connected, and these first control lines and these the second control lines are corresponding with these groups respectively arranges, and these first control lines and these the second control lines are electrically connected with these pixel cells of corresponding group respectively, wherein (m/n) is positive integer, and 2≤(m/n) < m.Whereby, compare with existing compensation technique in proper order and disposable compensation technology, organic LED display device of the present invention and driving method thereof, not only can reduce the use amount of sweep signal circuit and drive IC thereof, more can not cause the phenomenon that display frame is glimmered.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of a kind of organic LED display device of present pre-ferred embodiments.
Fig. 2 is the schematic diagram of the organic LED display device of another enforcement aspect of present pre-ferred embodiments.
Fig. 3 is the schematic diagram of the organic LED display device driving method of present pre-ferred embodiments.
Fig. 4 A is in existing compensation technique in proper order, the different phase schematic diagram of the pixel cell in a picture frame time.
Fig. 4 B is in driving method of the present invention, the different phase schematic diagram of the group in a picture frame time.
Main element symbol description
1,1a: organic LED display device
11: display floater
111: pixel cell
12: compensation drive circuit
13: data drive circuit
14: sequential control circuit
CL11 ~ CL1n: the first control line
CL21 ~ CL2n: the second control line
CL31 ~ CL3n: the three control line
D1 ~ Dp: data wire
G1 ~ Gn: group
S1 ~ Sm: scan line
S01: step
Embodiment
Hereinafter with reference to correlative type, the organic LED display device according to present pre-ferred embodiments and driving method thereof are described, wherein identical element is illustrated with identical reference marks.
Please refer to shown in Fig. 1, it is the schematic diagram of a kind of organic LED display device 1 of present pre-ferred embodiments.
Organic LED display device 1 comprises a display floater 11, m bar scan line S1 ~ Sm, p bar data wire D1 ~ Dp, n bar first control line CL11 ~ CL1n, n bar second control line CL21 ~ CL2n and a compensation drive circuit 12.Wherein, (m/n) is positive integer, and 2≤(m/n) < m.In addition, organic LED display device 1 also can comprise data drive circuit 13 and a sequential control circuit 14.
Display floater 11 has multiple pixel cell 111, and these pixel cells 111 be configured to by column direction and line direction form rectangular.Wherein, above-mentioned column direction is such as the vertical direction of Fig. 1, and line direction is such as the horizontal direction of Fig. 1.In addition, each pixel cell 111 has a compensating circuit (figure does not show) respectively.The compensation of pixel can be carried out by the pixel cell 111 with compensating circuit, the driving transistors that can improve Organic Light Emitting Diode whereby causes the skew of critical voltage because of the equal factor of technique, material or element characteristic, and then improves the phenomenon of display frame brightness irregularities.The present invention does not limit the combination that pixel cell 111 is how many thin-film transistors or how many electric capacity.In various embodiments, pixel cell 111 can be a 3T2C(3 transistor AND gate 2 electric capacity) circuit or be the circuit of a 4T2C, or be the thin-film transistor of other quantity and the combinational circuit of electric capacity, the present invention is not particularly limited the combinational circuit of the TFT transistor AND gate electric capacity being used in other quantity.Due to actual circuit structure and the mechanism how to compensate the not emphasis of the present invention of pixel cell 111, and the technical staff knowing this skill can by the running understanding its circuit and compensation in prior art, and the present invention no longer more to be explained.
It is capable that these pixel cells 111 have m, and the pixel cell 111 of these row is divided into n group G1 ~ Gn.Wherein, each group has the row of equal number, therefore has the pixel cell 111 of equal number.In other words, with behavior unit, the pixel cell 111 of all row is on average divided into n group G1 ~ Gn along column direction, makes each group have the pixel cell 111 of equal number.In addition, compensation drive circuit 12 is electrically connected with these pixel cells 111 of display floater 11 respectively by these scan lines S1 ~ Sm, these the first control line CL11 ~ CL1n and these second control lines CL21 ~ CL2n.In the present embodiment, pixel cell 111 is such as the circuit structure of a 3T2C, therefore compensation drive circuit 12 is electrically connected by all pixel cells 111 of a scan line with corresponding same a line, and be electrically connected with all pixel cells 111 of corresponding same group by first control line (such as compensating signal line) and second control line (being such as the holding wire of the luminescence of control OLED).It should be noted that, the present invention does not limit the quantity of control line, control line will according to compensation drive circuit use the quantity of element and change, in this, for two groups of control lines, i.e. n bar first control line CL11 ~ CL1n and n bar second control line CL21 ~ CL2n.
These the first control line CL11 ~ CL1n and these second control lines CL21 ~ CL2n are corresponding with these groups G1 ~ Gn respectively to be arranged, and is electrically connected with these pixel cells 111 of corresponding group respectively.In the present embodiment, there is the pixel cell 111 of three row in each group, and therefore, the quantity of the pixel cell 111 of each group is 3 × p(because of total p row).But, in other enforcement aspect, also the row of varying number can be divided into a group, such as 2 row, 4 row or other, all pixel cells 111 to be divided into the group of varying number.Wherein, these scan lines S1 ~ Sm is corresponding with the pixel cell 111 of these row respectively arranges and is electrically connected.In this, as shown in Figure 1, scan line S1 is connected with these pixel cells 111 of the first row, and scan line S2 is connected with these pixel cells 111 of the second row ..., these pixel cells 111 that scan line Sm is capable with m are connected.Therefore, specifically, the scan line of the present embodiment has m bar, and it is capable that pixel cell 111 has m, and the pixel cell 111 of 3 row is divided into a group (total n group), therefore (m/n)=3.
In addition, data drive circuit 13 is electrically connected with these pixel cells 111 of display floater 11 by these data wires D1 ~ Dp, and sequential control circuit 14 is electrically connected with compensation drive circuit 12 and data drive circuit 13 respectively.Wherein, sequential control circuit 14 can transmit vertical clock signal and vertical synchronizing signal to compensation drive circuit 12, and convert the picture signal received from external interface to data drive circuit 13 data-signal used, and data signal, horizontal clock signal and horizontal-drive signal are to data drive circuit 13.In addition, compensation drive circuit 12 sequentially drives these pixel cells 111 by these first control lines CL11 ~ CL1n, these the second control line CL21 ~ CL2n and these scan lines S1 ~ Sm.In this, compensation drive circuit 12 is according to these scan lines of vertical synchronizing signal turn in order S1 ~ Sm, and when compensation drive circuit 12 by before these pixel cells 111 of a certain its corresponding row of bar scan line conducting time, compensation drive circuit 12 also drives these pixel cells 111 corresponding with this scan line, to carry out the action of pixel compensation and control OLED luminescence by these the first control line CL11 ~ CL1n and these second control lines CL21 ~ CL2n.Wherein, compensation drive circuit 12 carries out the compensation of critical voltage skew to the thin-film transistor of these pixel cells 111 by these the first control line CL11 ~ CL1n or these second control lines CL21 ~ CL2n.When the conducting of these scan lines S1 ~ Sm difference, pixel voltage signal by the data-signal of the pixel cell 111 of every for correspondence a line, can be sent to each pixel cell 111 by these data wires D1 ~ Dp by data drive circuit 13, to make display unit 1 show image.
In addition, please refer to shown in Fig. 2, it is the schematic diagram of the organic LED display device 1a of another enforcement aspect of present pre-ferred embodiments.
Be from main different of organic LED display device 1, organic LED display device 1a also can comprise n article of the 3rd control line CL31 ~ CL3n, these the 3rd control line CL31 ~ CL3n are corresponding with these groups G1 ~ Gn respectively to be arranged, and these the 3rd control line CL31 ~ CL3n are electrically connected with these pixel cells 111 of corresponding group G1 ~ Gn respectively.In this, the pixel cell 111 of organic LED display device 1a is such as the circuit structure of a 4T2C, therefore compensation drive circuit 12 is electrically connected by all pixel cells 111 of a scan line with corresponding same a line, and be electrically connected with all pixel cells 111 of corresponding same group by one article of first control line (being such as compensating signal line), one article of second control line (being such as the holding wire of the illuminated switch of control OLED) and one article of the 3rd control line (being such as a reset signal line).
In addition, organic LED display device 1a drives process and other technical characteristic to can refer to organic LED display device 1, repeats no more.
Below, please refer to shown in Fig. 1 and Fig. 3, so that the driving method of organic LED display device 1 of the present invention to be described.Wherein, Fig. 3 is the schematic diagram of the organic LED display device driving method of present pre-ferred embodiments.In this, much more no longer the technical characteristic of organic LED display device 1, in above-mentioned middle detailed description, explains.
The driving method of organic LED display device 1 comprises step S01: by compensation drive circuit 12 sequentially by these first control lines CL11 ~ CL1n, these the second control line CL21 ~ CL2n and these scan lines S1 ~ Sm drive these pixel cells 111, wherein to have m capable for these pixel cells 111, and the pixel cell 111 of these row is divided into n group G1 ~ Gn, these scan lines S1 ~ Sm is corresponding with the pixel cell 111 of these row respectively to be arranged and is electrically connected, these the first control line CL11 ~ CL1n and these second control lines CL21 ~ CL2n are corresponding with these groups G1 ~ Gn respectively to be arranged, and these the first control line CL11 ~ CL1n and these second control lines CL21 ~ CL2n are electrically connected with these pixel cells 111 of corresponding group G1 ~ Gn respectively, wherein (m/n) is positive integer, and 2≤(m/n) < m.
Before these pixel cells 111 by a certain bar scan line conducting corresponding row of compensation drive circuit 12, also by these the first control line CL11 ~ CL1n or these second control lines CL21 ~ CL2n, the thin-film transistor to these pixel cells 111 of corresponding group carries out the compensation of critical voltage skew to compensation drive circuit 12.For Article 1 scan line S1, before the pixel cell 111 of the first row corresponding to scan line S1 conducting, compensation drive circuit 12 is also by the first control line CL11(or the second control line CL21) three row are had to first group G1() the thin-film transistor of all pixel cells 111 carry out the compensation of critical voltage skew.Then, before the pixel cell 111 of the second row corresponding to scan line S2 conducting, compensation drive circuit 12 is same by the first control line CL11(or the second control line CL21) three row are had to second group G2() the thin-film transistor of all pixel cells 111 carry out the compensation of critical voltage skew, by that analogy.
In addition, when these scan lines S1 ~ Sm is switched on respectively, pixel voltage signal by the data-signal of the pixel cell 111 of every for correspondence a line, can be sent to each pixel cell 111 by these data wires D1 ~ Dp by data drive circuit 13, to make display unit 1 show image.
Please refer to shown in Fig. 4 A and Fig. 4 B, wherein, Fig. 4 A is in existing compensation technique in proper order, the different phase schematic diagram of the pixel cell in a picture frame time, and Fig. 4 B is in driving method of the present invention, the different phase schematic diagram of the group in a picture frame time.
Due in a picture frame time (frame time), these pixel cells 111 have three phases: the write phase of compensated stage, pixel voltage and the display stage of picture.Comparison diagram 4A and Fig. 4 B can find, in the technology of the P-SCAN of Fig. 4 A, the make-up time of pixel can be limited in the ON time of a scan line.Review in the embodiments of the invention of Fig. 1, it is capable that these pixel cells 111 have m, and the pixel cell 111 of these row is divided into n group G1 ~ Gn, these the first control line CL11 ~ CL1n and these second control lines CL21 ~ CL2n are corresponding with these groups G1 ~ Gn respectively to be arranged, and these the first control line CL11 ~ CL1n and these second control lines CL21 ~ CL2n are electrically connected with these pixel cells 111 of corresponding group G1 ~ Gn respectively, in other words, each first control line and each second control line are electrically connected with the pixel cell 111 of a group (three row) respectively, therefore, a group can be had, the ON time of totally three scan lines can carry out the compensation of pixel.Whereby, compare with the existing technology compensated in proper order, as shown in Figure 4 B, the make-up time of the present invention can be greater than the make-up time compensated in proper order.When panel size is larger, because the load (loading) of RC is comparatively large, the therefore more pixel compensation time can make the waveform of signal more not yielding, therefore can improve display quality.In addition, the display unit of the present embodiment and driving method thereof also can reduce the quantity of sweep signal circuit (comprising scan line, the first holding wire and secondary signal line) whereby, and then the usage quantity of the drive IC of reduction compensation drive circuit 12.In addition, the displaying time of Fig. 4 B is more or less the same with the displaying time compensated in proper order, therefore, and also can not the film flicker phenomenon of once property compensation technique.It is worth mentioning that, if with GOP(gate on panel) technology and by compensation drive circuit 12 with shift registor (shift register, SR), when electrical combination is made on display floater 11, the complexity in circuits of compensation drive circuit 12 can also be reduced again.
Lift specific embodiment, when organic LED display device 1 has 480 scan lines (m=480), if 3 behavior one groups (i.e. (m/n)=3), then have 160 groups (n=160), therefore the signal line of scanning, namely scan line+the first control line+the second control line only has 480+(480/3)+(480/3) totally 800.But, if the technology of P-SCAN, then total 480(scan line)+480(first control line)+480(second control line) circuit of sweep signal of totally 1440, therefore, the present invention can reduce by the signal line of 640.
In other embodiments, if 4 behavior one groups (i.e. (m/n)=4), then have 120 groups (n=120), therefore the present invention only has 480+(480/4)+(480/4) sweep signal circuit of totally 720, fewer than P-SCAN signal line of 720.
In addition, with the structure of the organic LED display device 1a of Fig. 2, these the 3rd control line CL31 ~ CL3n are corresponding with these groups G1 ~ Gn respectively to be arranged, and these the 3rd control line CL3 are electrically connected with these pixel cells 111 of corresponding group G1 ~ Gn respectively.Therefore, when by compensation drive circuit 12 by a certain bar scanning line driving before these pixel cells 111 of conducting corresponding row, driving method also can drive these corresponding pixel cells 111 by compensation drive circuit 12 by the 3rd control line.
In addition, other technical characteristic of the driving method of organic LED display device, in above-mentioned middle detailed description, repeats no more.
In sum, because of in organic LED display device of the present invention and driving method thereof, it is capable that these pixel cells have m, and the pixel cell of these row is divided into n group.In addition, these scan lines are corresponding with the pixel cell of these row to be arranged and is electrically connected, and these first control lines and these the second control lines are corresponding with these groups respectively arranges, and these first control lines and these the second control lines are electrically connected with these pixel cells of corresponding group respectively, wherein (m/n) is positive integer, and 2≤(m/n) < m.Whereby, compare with existing compensation technique in proper order and disposable compensation technology, organic LED display device of the present invention and driving method thereof, not only can reduce the use amount of sweep signal circuit and drive IC thereof, more can not cause the phenomenon that display frame is glimmered.
The foregoing is only illustrative, but not be restricted person.Anyly do not depart from spirit of the present invention and category, and to its equivalent modifications of carrying out or change, all should be contained in claim.
Claims (10)
1. an organic LED display device, is characterized in that, described organic LED display device comprises:
One display floater, have multiple pixel cell be configured to by row with row form rectangular, each pixel cell has a compensating circuit, and it is capable that described pixel cell has m, and the pixel cell of described row is divided into n group;
M bar scan line, correspondingly with the pixel cell of described row arranges and is electrically connected;
N bar first control line and n bar second control line, correspondingly with described group respectively to arrange, and described first control line and described second control line are electrically connected with the described pixel cell of corresponding group respectively, wherein (m/n) is positive integer, and 2≤(m/n) < m; And
One compensation drive circuit, is electrically connected with described pixel cell by described scan line, described first control line and described second control line.
2. organic LED display device as claimed in claim 1, it is characterized in that, each group has the pixel cell of the row of equal number.
3. organic LED display device as claimed in claim 1, it is characterized in that, this compensation drive circuit is sequentially by pixel cell described in described first control line, described second control line and described scanning line driving.
4. organic LED display device as claimed in claim 1, is characterized in that, this compensation drive circuit is electrically connected with all pixel cells of corresponding same group by first control line and second control line.
5. organic LED display device as claimed in claim 1, it is characterized in that, described organic LED display device also comprises:
N article of the 3rd control line, correspondingly with described group is respectively arranged, and described 3rd control line is electrically connected with the described pixel cell of corresponding group respectively.
6. the driving method of an organic LED display device, it is characterized in that, this organic LED display device comprises a display floater, m bar scan line, n bar first control line, n bar second control line and a compensation drive circuit, described pixel cell be configured to by row with row form rectangular, each pixel cell has a compensating circuit, this compensation drive circuit is electrically connected with described pixel cell by described scan line, described first control line and described second control line, and this driving method comprises:
By this compensation drive circuit sequentially by described first control line, pixel cell described in described second control line and described scanning line driving, it is capable that wherein said pixel cell has m, and the pixel cell of described row is divided into n group, described scan line is corresponding with the pixel cell of described row respectively to be arranged and is electrically connected, described first control line and described second control line is corresponding with described group respectively arranges, and described first control line and described second control line are electrically connected with the described pixel cell of corresponding group respectively, wherein (m/n) is positive integer, and 2≤(m/n) < m.
7. driving method as claimed in claim 6, it is characterized in that, each group has the pixel cell of the row of equal number.
8. driving method as claimed in claim 6, it is characterized in that, when by this compensation drive circuit by before the described pixel cell of scan line conducting corresponding row, this compensation drive circuit also carries out the compensation of critical voltage skew by the thin-film transistor of the described pixel cell of described first control line or the described second corresponding group of control pair.
9. driving method as claimed in claim 8, it is characterized in that, this organic LED display device also has n article of the 3rd control line, and described 3rd control line is corresponding with described group respectively to be arranged, and described 3rd control line is electrically connected with the described pixel cell of corresponding group respectively.
10. driving method as claimed in claim 9, is characterized in that, before the described pixel cell being passed through scan line conducting corresponding row by this compensation drive circuit, this driving method also comprises:
Corresponding described pixel cell is driven by described 3rd control line by this compensation drive circuit.
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| CN201410100064.9A CN104934459A (en) | 2014-03-18 | 2014-03-18 | Organic light-emitting diode display device and driving method thereof |
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| CN108364608A (en) * | 2018-05-25 | 2018-08-03 | 京东方科技集团股份有限公司 | Oled panel and its driving method, display device |
| WO2020215305A1 (en) * | 2019-04-26 | 2020-10-29 | 深圳市柔宇科技有限公司 | Display panel and compensation method therefor |
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