CN103021332A - Driving system for display - Google Patents
Driving system for display Download PDFInfo
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- CN103021332A CN103021332A CN2012105126952A CN201210512695A CN103021332A CN 103021332 A CN103021332 A CN 103021332A CN 2012105126952 A CN2012105126952 A CN 2012105126952A CN 201210512695 A CN201210512695 A CN 201210512695A CN 103021332 A CN103021332 A CN 103021332A
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Abstract
The invention provides a driving system for a display. The system comprises a pixel circuit, and the pixel circuit is provided with an organic light-emitting element, a storage capacitor, a transistor and a control line for controlling the pixel circuit. When the pixel circuit is stylized and driven, compensation to brightness decay of an organic light-emitting diode can be achieved through the circuit, and high-accuracy and high-stability current can be generated.
Description
Technical field
The present invention relates to display of organic electroluminescence, more specifically, relate to the drive system for the decay of compensation organic electroluminescent diode display brightness.
Background technology
Display of organic electroluminescence has been widely used on the various display devices, the advantage such as particularly have amorphous silicon (a-Si), polysilicon (P-Si), low temperature polycrystalline silicon (LTPS), organic or other the active light-emittingdiode of active matrix drive (AMOLED) display that drives backboard has widely attractive force, and reason is that it is frivolous, active illuminating, wide visual angle, high-res, high color saturation, fast response speed, low manufacturing cost, serviceability temperature scope are wide.
The AMOLED display is arranged with matrix form by numerous pixels, and each pixel consists of by organic light emitting diode, memory capacitance, electric crystal.Because AMOLED is current driving element, be necessary so the accurate and stable drive current of AMOLED pixel unit circuit is provided, and along with the increase of service time, the cross-pressure at the two ends of OLED can increase thereupon, that is to say that the electric current that flows through OLED can reduce.
Summary of the invention
The object of the present invention is to provide a kind of drive system for display, this drive system can produce the electric current of pinpoint accuracy, high stability.
For arriving above-mentioned purpose, the present invention has adopted following technical scheme:
This drive system comprises turntable driving module, data-driven module, power supply and several pixel unit circuits, and described pixel unit circuit comprises luminescent device, has the memory capacitance of first end and the second end, has gate terminal, the first electric crystal, the second electric crystal, the 3rd electric crystal, the 4th electric crystal and the 5th electric crystal of first end and the second end;
The gate terminal of the first electric crystal links to each other with the turntable driving module, and the first end of the first electric crystal links to each other with the data-driven module, and the second end of the first electric crystal links to each other with the first end of the first end of memory capacitance and the second electric crystal;
The gate terminal of the second electric crystal links to each other with the turntable driving module, and the first end of the second electric crystal links to each other with the first end of memory capacitance, and the second end of the second electric crystal links to each other with the first end of the 4th electric crystal;
The gate terminal of the 3rd electric crystal links to each other with the turntable driving module, the first end of the 3rd electric crystal links to each other with the second end of memory capacitance and the gate terminal of the 4th electric crystal, and the second end of the 3rd electric crystal links to each other with the first end of the second end of the 4th electric crystal and the 5th electric crystal;
The gate terminal of the 4th electric crystal links to each other with the second end of memory capacitance, and the second end of the 4th electric crystal links to each other with the first end of the 5th electric crystal;
The gate terminal of the 5th electric crystal links to each other with the turntable driving module, and the second end of the 5th electric crystal links to each other with the cold end of power supply;
One end of luminescent device links to each other with the first end of the second end of the second electric crystal and the 4th electric crystal, and the other end links to each other with the hot end of power supply.
Described turntable driving module leads to first and selects line, second to select line and the 3rd to select line, the gate terminal of the gate terminal of the first electric crystal and the 3rd electric crystal and first selects line to link to each other, the gate terminal of the 5th electric crystal and second selects line to link to each other, and the gate terminal of the second electric crystal and the 3rd selects line to link to each other.
Described turntable driving module is selected line, second to select line and the 3rd to select line to drive pixel unit circuit by first and is formed successively the cycle of stylizing and drive cycle, and the cycle of stylizing comprises precharge cycle, compensation cycle and gap periods successively.
Described memory capacitance is charged during precharge cycle, in compensation cycle discharge, keeps the compensation cycle reserved value in gap periods, and the storing value of memory capacitance puts between the grid of the first end of the 4th electric crystal and the 4th electric crystal during the drive cycle.
During the described compensation cycle, the storing value of memory capacitance depends on the threshold voltage of the 4th electric crystal, cross-pressure and the gray scale voltage of luminescent device.
Described display is display of organic electroluminescence or active-matrix active display.
Described luminescent device is organic light emitting diode.
At least one adopts amorphous, nanocrystalline, crystallite, polycrystalline, organic material, n type material, P-type material or CMOS silicon in described the first to the 5th electric crystal.
Drive system for display of the present invention is when stylizing to pixel unit circuit and driving this circuit, and circuit can be realized the compensation to luminescent device brightness decay, can produce the electric current of pinpoint accuracy, high stability.
Description of drawings
Fig. 1 shows the structural representation of pixel unit circuit of the present invention;
The sequential chart that provides according to pixel unit circuit among Fig. 1 is provided Fig. 2;
Fig. 3 shows the driving system structure that is made of Fig. 1 pixel unit circuit;
Among the figure: turntable driving module SD, data-driven module DD, pixel unit circuit 100, memory capacitance 112, luminescent device 114, the first electric crystals 102, the second electric crystal 104, the three electric crystals 106, the four electric crystals 108, the 5th electric crystal 110, the first selects line S1, second to select line S2, and the 3rd selects line S3, stylize the cycle 120 drive cycle 122, precharge cycle X11, compensation cycle X12, gap periods X13.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
Present embodiment is to describe by the image element circuit of the luminescent device that utilizes organic light emitting diode and a plurality of electric crystals.Yet image element circuit can comprise different classes of OLED device, electric crystal in the image element circuit can be N-shaped, p-type or its combination, and the electric crystal in the image element circuit can utilize amorphous silicon (a-Si), polysilicon (P-Si), low temperature polycrystalline silicon (LTPS), NMOS/PMOS technology or CMOS technology to make.Display with pixel unit circuit can be monochrome, polychrome or full-color display, and can comprise one or more light-emitting components.Display can be used in DVD, PDA, computing machine, notebook computer, the TV.
In following description, " image element circuit " and " pixel " is used interchangeably.In following description, " connection " and " coupling " is used interchangeably.In following description, " control line " and " selection line " " address wire " is used interchangeably.
Fig. 1 shows the pixel unit circuit 100 with 5 electric crystals (5T).Pixel unit circuit 100 among Fig. 1 comprises electric crystal, a memory capacitance 112 and an OLED luminescent device 114.Pixel unit circuit 100 is connected to three and selects line S1, S2, S3, a data line Vdata, a pressure-wire VDD and a ground wire VSS.
Electric crystal is P type TFT, yet electric crystal also can be N-type TFT.Electric crystal can utilize amorphous silicon (a-Si), polysilicon (P-Si), low temperature polycrystalline silicon (LTPS), NMOS/PMOS technology or CMOS technology to make, and a plurality of pixel unit circuits are arranged with matrix form and then formed the AMOLED display.
The 4th electric crystal 108 is a driving electric crystal.The source electrode of the 4th electric crystal 108 is connected respectively to the negative electrode of OLED luminescent device 114 and the source electrode of the 5th electric crystal 110 with drain electrode.The grid of the 4th electric crystal 108 sees through memory capacitance 112, the first electric crystal 102 is connected to data line Vdata, and links to each other with the source electrode of the 3rd electric crystal 106.
The drain electrode of the 3rd electric crystal 106 is connected to the source electrode of the 5th electric crystal 110, the drain electrode of the 4th electric crystal 108, and the source electrode of the 3rd electric crystal 106 links to each other with the grid of the 4th electric crystal 108, and the grid of the 3rd electric crystal 106 and first selects line S1 to link to each other.
The drain electrode of the second electric crystal 104 is connected to the negative electrode of OLED luminescent device 114, and the source electrode of the second electric crystal 104 is connected to the drain electrode of the first electric crystal 102, and the grid of the second electric crystal 104 and the 3rd selects line S3 to link to each other.
The first electric crystal 102 is a switch electric crystal, the source electrode of the first electric crystal 102 links to each other with the end of data line Vdata, the other end of data line Vdata links to each other with data-driven module DD, the drain electrode of the first electric crystal 102 links to each other with the source electrode of the second electric crystal 104, and the grid of the first electric crystal 102 and first selects line S1 to link to each other.
The 5th electric crystal 110 is a light emitting control electric crystal, the source electrode of the 5th electric crystal 110 links to each other with the drain electrode of the 4th electric crystal 108, the drain electrode of the 5th electric crystal 110 links to each other with the end of ground wire VSS, the other end of ground wire VSS links to each other with the cold end of power supply, and the grid of the 5th electric crystal 110 and second selects line S2 to link to each other.
The first electric crystal 102, the second electric crystal 104 link to each other at node A place with memory capacitance 112.The 3rd electric crystal 106, the 4th electric crystal 108 link to each other at the Node B place with memory capacitance 112.
The anode of OLED luminescent device 114 links to each other with the hot end of power supply by pressure-wire VDD.
Fig. 2 is a kind of waveform synoptic diagram that applies to the embodiment of Fig. 1, does not certainly get rid of other waveform synoptic diagram and also is applicable to Fig. 1.
With reference to Fig. 1, Fig. 2, the manner of execution of pixel unit circuit 100 comprises two operation periods: cycle 120 and drive cycle 122 stylize.At the cycles of stylizing 120 end, node A is charged to V
P, V wherein
PIt is a gray scale voltage; Node B is charged to V
DD-V
OLED_0+ V
TH, V
THBe the threshold voltage of the 4th electric crystal 108, V
DDBe the voltage of the hot end of power supply, V
OLED_0Initial voltage for OLED luminescent device 114 cathode terminals.Memory capacitance then is charged to V
A-V
B=V
P-(V
DD-V
OLED_0+ V
TH), wherein, V
TH＜0.
Cycle 120 of stylizing comprises three subcycles: precharge cycle X11, compensation cycle X12, gap periods X13.At precharge cycle X11, it is low that the first selection line S1, second selects line S2 and the 3rd selection line S3 is high, make respectively the first electric crystal 102, the 3rd electric crystal 106,110 conductings of the 5th electric crystal, and the second electric crystal 104 is closed.The voltage of data line Vdata is made as V
P, V
PIt is a gray scale voltage.Terminal at precharge cycle X11, node A is charged to V
P, Node B is charged to VSS, and then the size of memory capacitance 112 is V
P-V
SS, V
SSBe the voltage of the cold end of power supply, V
SSCan be 0, also can be negative voltage.
In compensation cycle X12, first selects line S1 to continue low and second to select line S2, the 3rd to select line S3 be height, so that the first electric crystal 102,106 conductings of the 3rd electric crystal, the second electric crystal 104, the five electric crystals 110 are closed.As a result, memory capacitance 112 sees through the 3rd electric crystal 106, the 4th electric crystal 108,114 discharges of OLED luminescent device, until the 4th electric crystal 108 is closed, the electric current that flows through the OLED luminescent device approaches till zero.Terminal at compensation cycle X12, through the discharge of memory capacitance 112, Node B voltage is V
B=V
DD-V
OLED_0+ V
TH, then the value of memory capacitance 112 is V
A-V
B=V
P-(V
DD-V
OLED_0+ V
TH), wherein, V
THBe the threshold voltage of the 4th electric crystal 108, and V
TH＜0.
In gap periods X13, it is high entirely that the first selection line S1, second selects line S2, the 3rd to select line S3, the electric crystal contract fully, and the effect in this stage is the interval as the driving stage, to improve contrast.In this stage, the value of memory capacitance 112 maintains V
P-(V
DD-V
OLED_0+ V
TH).
In drive cycle 122, the first selection line S1 is high, and it is low that the second selection line S2, the 3rd selects line S3, and the first electric crystal 102, the 3rd electric crystal 106 are closed, and the second electric crystal electric crystal 104, the 5th electric crystal 110 are opened.As a result, the cross-pressure information of node A record OLED luminescent device, i.e. V
A=V
DD-V
OLED, at drive cycle, V
OLED_0Increase to V
OLED, Node B is in floating, and the voltage of Node B will be done equivalent with node A and jump, and this phenomenon is called as from rising effect, Δ V
A=V
DD-V
OLED-V
P, V then
B=(V
DD-V
OLED_0+ V
TH)+(VDD-V
OLED-V
P), the value of memory capacitance 112 is:
V
A-V
B=(V
DD-V
OLED)-[(V
DD-V
OLED_0+V
TH)+(V
DD-V
OLED-V
P)]
=-V
DD+V
OLED_0+V
P-V
TH
When the 4th electric crystal 108 bodies entered the saturation region, the size of current that flows through OLED luminescent device 114 was:
i＝β[V
sg+V
TH]
2
=β[-V
DD+V
OLED_0+V
P-V
TH+V
TH]
2
=β[V
DD-V
OLED_0-V
P]
2
Wherein,
Be the mutual conductance coefficient of the 4th electric crystal 108, V
SGRepresent the voltage between the 4th electric crystal 108 source electrodes and grid.
According to above analysis as can be known, flow through the electric current of OLED luminescent device 114, final and gray scale voltage V
P, OLED initial cross-pressure V
DD-V
OLED_0Relevant, namely along with the increase of service time, electric current and the cross-pressure variation of flowing through the OLED luminescent device are irrelevant, compensate in this way the brightness decay phenomenon that the OLED luminescent device occurs because service time is long.
The driving system structure of Fig. 3 for being consisted of by Fig. 1 pixel unit circuit.System comprise have a plurality of pixel unit circuits shown in Figure 1 100, turntable driving module SD and data-driven module DD, in Fig. 3, pixel is arranged in the mode of two row and two row, yet, the number of pixel can be different according to system, and are not limited to 4.Pel array is an active array active display, and can form an AMOLED display.
Claims (8)
1. drive system that is used for display, this drive system comprises turntable driving module (SD), data-driven module (DD), power supply and several pixel unit circuits (100), it is characterized in that: described pixel unit circuit (100) comprises luminescent device (114), have the memory capacitance (112) of first end and the second end, have the first electric crystal (102), the second electric crystal (104), the 3rd electric crystal (106), the 4th electric crystal (108) and the 5th electric crystal (110) of gate terminal, first end and the second end;
The gate terminal of the first electric crystal (102) links to each other with turntable driving module (SD), the first end of the first electric crystal (102) links to each other with data-driven module (DD), and the second end of the first electric crystal (102) links to each other with the first end of memory capacitance (112) and the first end of the second electric crystal (104);
The gate terminal of the second electric crystal (104) links to each other with turntable driving module (SD), the first end of the second electric crystal (104) links to each other with the first end of memory capacitance (112), and the second end of the second electric crystal (104) links to each other with the first end of the 4th electric crystal (108);
The gate terminal of the 3rd electric crystal (106) links to each other with turntable driving module (SD), the first end of the 3rd electric crystal (106) links to each other with the second end of memory capacitance (112) and the gate terminal of the 4th electric crystal (108), and the second end of the 3rd electric crystal (106) links to each other with the second end of the 4th electric crystal (108) and the first end of the 5th electric crystal (110);
The gate terminal of the 4th electric crystal (108) links to each other with the second end of memory capacitance (112), and the second end of the 4th electric crystal (108) links to each other with the first end of the 5th electric crystal (110);
The gate terminal of the 5th electric crystal (110) links to each other with turntable driving module (SD), and the second end of the 5th electric crystal (110) links to each other with the cold end of power supply;
One end of luminescent device (114) links to each other with the second end of the second electric crystal (104) and the first end of the 4th electric crystal (108), and the other end links to each other with the hot end of power supply.
2. described a kind of drive system for display according to claim 1, it is characterized in that: described turntable driving module (SD) leads to first and selects line (S1), second to select line (S2) and the 3rd to select line (S3), the gate terminal of the gate terminal of the first electric crystal (102) and the 3rd electric crystal (106) and first selects line (S1) to link to each other, the gate terminal of the 5th electric crystal (110) and second selects line (S2) to link to each other, and the gate terminal of the second electric crystal (104) and the 3rd selects line (S3) to link to each other.
3. described a kind of drive system for display according to claim 2, it is characterized in that: described turntable driving module (SD) forms successively by the first selection line (S1), the second selection line (S2) and the 3rd selection line (S3) driving pixel unit circuit (100) and stylizes the cycle (120) and drive cycle (122), and stylize the cycle (120) comprise precharge cycle (X11), compensation cycle (X12) and gap periods (X13) successively.
4. described a kind of drive system for display according to claim 3, it is characterized in that: described memory capacitance (112) is charged during precharge cycle (X11), discharge at compensation cycle (X12), (X13) keeps the compensation cycle reserved value in gap periods, and the storing value of memory capacitance (112) puts between the grid of the first end of the 4th electric crystal (108) and the 4th electric crystal (108) during the drive cycle (122).
5. described a kind of drive system for display according to claim 3, it is characterized in that: during the described compensation cycle (X12), the storing value of memory capacitance (112) depends on cross-pressure and the gray scale voltage of the threshold voltage of the 4th electric crystal (108), luminescent device (114).
6. according to claim 1,2,3,4 or 5 described a kind of drive systems for display, it is characterized in that: described display is display of organic electroluminescence or active-matrix active display.
7. according to claim 1,2,3,4 or 5 described a kind of drive systems for display, it is characterized in that: described luminescent device (114) is organic light emitting diode.
8. according to claim 1,2,3,4 or 5 described a kind of drive systems for display, it is characterized in that: at least one adopts amorphous, nanocrystalline, crystallite, polycrystalline, organic material, n type material, P-type material or CMOS silicon in described the first to the 5th electric crystal.
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| CN2012105126952A CN103021332A (en) | 2012-12-04 | 2012-12-04 | Driving system for display |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105126952A CN103021332A (en) | 2012-12-04 | 2012-12-04 | Driving system for display |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103440841A (en) * | 2013-07-23 | 2013-12-11 | 深圳典邦科技有限公司 | Pixel circuit of organic light-emitting display and control method thereof |
| CN103578428A (en) * | 2013-10-25 | 2014-02-12 | 华南理工大学 | Method for driving pixel circuit of active organic electroluminescence displayer |
| CN103839520A (en) * | 2014-02-28 | 2014-06-04 | 京东方科技集团股份有限公司 | Pixel circuit, method for driving pixel circuit, display panel and display device |
| CN104575378A (en) * | 2014-12-23 | 2015-04-29 | 北京大学深圳研究生院 | Pixel circuit, display device and display driving method |
| CN106340268A (en) * | 2016-11-11 | 2017-01-18 | 京东方科技集团股份有限公司 | Pixel driving circuit and driving method thereof, and display device |
| CN110301000A (en) * | 2019-01-04 | 2019-10-01 | 京东方科技集团股份有限公司 | The method and corresponding display device that brightness disproportionation for display device compensates |
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| CN104575378A (en) * | 2014-12-23 | 2015-04-29 | 北京大学深圳研究生院 | Pixel circuit, display device and display driving method |
| CN106340268A (en) * | 2016-11-11 | 2017-01-18 | 京东方科技集团股份有限公司 | Pixel driving circuit and driving method thereof, and display device |
| CN106340268B (en) * | 2016-11-11 | 2017-11-28 | 京东方科技集团股份有限公司 | A kind of pixel-driving circuit and its driving method, display device |
| CN110301000A (en) * | 2019-01-04 | 2019-10-01 | 京东方科技集团股份有限公司 | The method and corresponding display device that brightness disproportionation for display device compensates |
| CN110301000B (en) * | 2019-01-04 | 2022-03-04 | 京东方科技集团股份有限公司 | Method for compensating brightness unevenness of display device and corresponding display device |
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