CN1332370C - Digital drive method and apparatus for active organic light-emitting diode display - Google Patents
Digital drive method and apparatus for active organic light-emitting diode display Download PDFInfo
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- CN1332370C CN1332370C CNB031018971A CN03101897A CN1332370C CN 1332370 C CN1332370 C CN 1332370C CN B031018971 A CNB031018971 A CN B031018971A CN 03101897 A CN03101897 A CN 03101897A CN 1332370 C CN1332370 C CN 1332370C
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Abstract
The present invention relates to a digital driving method and a device for an active organic light emitting diode display. The device is mainly composed of a plurality of groups of pixel devices, an organic light emitting diode (OLED) of each pixel device adopts a common cathode grounding mode, and the magnitude of the electric potential of a power cord is controlled to realize a digital driving frame with separated program and display. When image data is input, the electric potential of the power cord is connected to a zero potential, and the organic light emitting diode can not emit light. When the image data is output, the electric potential of the power cord is connected to a positive electric potential, and the organic light emitting diode emits the light.
Description
Technical field
The present invention is the digital drive method and the device of relevant a kind of positive type organic light emitting diode display, refers to a kind of height that utilizes control power lead current potential especially, to realize writing the digital drive framework of shinny separation.
Background technology
Known, the present technology of TFT is divided into amorphous silicon (a-Si TFT) and two kinds of polysilicons (Poly-SiTFT), and general alleged TFT-LCD is meant amorphous silicon (a-Si TFT), and technology maturation is the main product of LCD at present.And the difference of low temperature polycrystalline silicon (LTPS TFT) and a-SiTFT maximum is that the transistor of LTPS need further accept the fabrication steps of laser tempering, change the film of amorphous silicon into layer polysilicon film, make LTPS orderly than the arrangement that a-Si TFT comes on the silicon wafer structure, therefore can improve electronic conduction speed reaches 200cm2/V-sec.The LTPS technology can make element do forr a short time, and whole TFT element area is dwindled more than 50%; And promote aperture opening ratio (aperture ratio), under same size, can produce higher resolution compared to a-Si TFT, and reduce the consumption of power; Can be integrated directly into (System on Glass) on the glass substrate with driving module in design, part Driver IC can be integrated in the glass substrate, help reducing the line between the required area of circuit board and number of elements and drive IC and the panel electrode, to reduce material cost, simultaneously more can be in the root module assembling process of back, avoid assembling the product infringement that is caused, and then promote yield to reduce manufacturing cost; In addition, because the use of integrated part Driver IC except reducing the weight of IC, more can reduce other required material of back segment assembling, whole weight will significantly reduce.Because low temperature polycrystalline silicon (LTPS TFT) still possesses power saving, brightness height, picture is meticulous, frivolous and the few advantages such as (less than 200 contacts, help yield and promote, a-Si TFT are greater than 3842 contacts) of contact.
Yet, because the thin film transistor (TFT) of low temperature polycrystalline silicon (LTPS) processing procedure manufacturing is variation to some extent on characteristic, so, when drive system is used simulation (ANALOG), during GTG, Chang Yinwei thin film transistor (TFT) (TFT) has different qualities to the modulation mode after the fabrication steps of accepting the laser tempering, even write identical voltage signal with performance, but the Organic Light Emitting Diode of different pixels produces different electric currents, and sends the brightness of different sizes.This phenomenon can make organic LED panel demonstrate the image of GTG mistake, havoc image uniformity (Image Uniformity).
Summary of the invention
So fundamental purpose of the present invention is to solve above-mentioned traditional disappearance, avoid disappearance to exist, the present invention utilizes control power lead current potential height, to realize writing the digital drive framework of shinny separation.
For achieving the above object, the digital drive method and the device of positive type organic light emitting diode display of the present invention, mainly formed by many groups pixel (pixel) device, and the Organic Light Emitting Diode (OLED) of each pixel arrangement adopted the common cathode earthing mode, utilize control power lead current potential height, to realize writing the digital drive framework of shinny separation (Program DisplaySeparated), when the input image data, the power lead current potential is connected to zero potential (GND), make the Organic Light Emitting Diode can't be shinny, when the image output data, then the current potential with power lead is connected to positive potential, makes Organic Light Emitting Diode shinny.
Description of drawings
Relevant detailed content of the present invention and technical descriptioon, existing conjunction with figs. is described as follows:
Fig. 1-the 1st, the single pixel arrangement synoptic diagram of first embodiment of the present invention positive type organic light emitting diode display.
Fig. 1-2 is the driving voltage waveform sequential chart of Fig. 1-1.
Fig. 2-the 1st, second embodiment of the present invention synoptic diagram.
Fig. 2-the 2nd, the driving voltage waveform sequential chart of Fig. 2-1.
Fig. 3-the 1st, third embodiment of the present invention synoptic diagram.
Fig. 3-the 2nd, the driving voltage waveform sequential chart of Fig. 3-1.
Embodiment
Seeing also shown in Fig. 1-1, the 1-2, is the single pixel arrangement synoptic diagram of first embodiment of the present invention positive type organic light emitting diode display and the driving voltage waveform sequential chart of Fig. 1-1.As shown in the figure: the digital drive method and the device of positive type organic light emitting diode display of the present invention, mainly form by 10 in many groups pixel (pixel) device, and the Organic Light Emitting Diode (OLED) 4 of each pixel arrangement 10 adopted the common cathode earthing mode, utilize control power lead 7 current potentials height, to realize writing the digital drive framework of shinny separation (Program DisplaySeparated), when the input image data, power lead 7 current potentials are connected to zero potential (GND), make the Organic Light Emitting Diode 4 can't be shinny, when the image output data, then the current potential with power lead 7 is connected to positive potential VH, makes Organic Light Emitting Diode 4 shinny.
For realizing said method, pixel that the present invention adopts (pixel) device 10 comprises: a switch element 1, a driver element 2, a storage element 3 and an Organic Light Emitting Diode (OLED) 4; Wherein,
Above-mentioned switch element 1 can be the thin film transistor (TFT) (TFT) of P channel, and 1 liang of input end of this switch element 11,12 respectively is connected with one scan line (Scan Line) 5 and one data line (Data Line) 6 respectively and connects;
This driver element 2 can be the thin film transistor (TFT) (TFT) of P channel, and the input end 21 of this driver element 2 connects power leads (SUPPLY LINE) 7, and other end input end 22 is connected with the output terminal 13 of above-mentioned switch element 1;
This storage element 3 is made of capacitor, an end ground connection, and the other end is connected in input end 22 junctions of output terminal 13 with the driver element 2 of switch element 1;
The input end 41 of this Organic Light Emitting Diode (OLED) 4 is connected with the output terminal 23 of above-mentioned driver element 2, and output terminal 42 ground connection of Organic Light Emitting Diode (OLED) 4;
When this installs in the scan-image data, the current potential of power lead 7 is connected to zero potential GND, make the Organic Light Emitting Diode 4 can't be shinny, this switch element 1 presents conducting state, this moment, image data entered into 1 li of switch element by data line 6, after sweep trace 5 scannings, and be stored in (also being after the switch element conducting) in the storage element 3 to the storage element charging, if image data is shinny, then store no-voltage GND in storage element 3, if image data for not shinny, then stores positive voltage VH in storage element 3; Sweep trace current potential in carrying out scanning process is zero potential GND, the current potential of other sweep trace then is positive potential VH, after waiting to finish all scanning motions, the current potential of power lead 7 is connected to positive potential VH, and makes storage no-voltage GND shinny in the Organic Light Emitting Diode 4 of the pixel arrangement 10 of storage element 3.
Seeing also shown in Fig. 2-1, the 2-2, is the driving voltage waveform sequential chart of second embodiment of the present invention synoptic diagram and Fig. 2-1.As shown in the figure: the digital drive method and the device of positive type organic light emitting diode display of the present invention, mainly form by 20 in many groups pixel (pixel) device, and the Organic Light Emitting Diode (OLED) 4 of each pixel arrangement 20 adopted the common cathode earthing mode, utilize control power lead 7 current potentials height, to realize writing the digital drive framework of shinny separation (Program Display Separated), when the input image data, power lead 7 current potentials are connected to zero potential (GND), make the Organic Light Emitting Diode 4 can't be shinny, when the image output data, then the current potential with power lead 7 is connected to positive potential VH, makes Organic Light Emitting Diode 4 shinny.
For realizing said method, pixel that the present invention adopts (pixel) device 20 comprises: a switch element 1, a driver element 2, a storage element 3 and an Organic Light Emitting Diode (OLED) 4; Wherein,
Above-mentioned switch element 1 can be the thin film transistor (TFT) (TFT) of P channel, and 1 liang of input end of this switch element 11,12 respectively is connected with one scan line (Scan Line) 5 and one data line (Data Line) 6 respectively and connects;
This driver element 2 can be the thin film transistor (TFT) (TFT) of P channel, and the input end of this driver element 2 connects 21 and connects power leads (SUPPLY LINE) 7, and other end input end 22 is connected with the output terminal 13 of above-mentioned switch element 1;
This storage element 3 is made of capacitor, and an end is connected in power lead 7, and the other end is connected in input end 22 junctions of output terminal 13 with the driver element 2 of switch element 1;
The input end 41 of this Organic Light Emitting Diode (OLED) 4 is connected with the output terminal 23 of above-mentioned driver element 2, and output terminal 42 ground connection of Organic Light Emitting Diode (OLED) 4;
When this installs in the scan-image data, the current potential of power lead 7 is connected to zero potential GND, make the Organic Light Emitting Diode 4 can't be shinny, this switch element 1 presents conducting state, this moment, image data was entered in 1 li of switch element by data line 6, after sweep trace 5 scannings, and be stored in (also being after the switch element conducting) in the storage element 3 to the storage element charging, if image data is shinny, then store negative voltage VL in storage element 3, if image data for not shinny, then stores no-voltage GND in storage element 3; Sweep trace current potential in carrying out scanning process is negative potential VL, the current potential of other sweep trace then is positive potential VH, after waiting to finish all scanning motions, the current potential of power lead 7 is connected to positive potential VH, and makes storage negative voltage VL shinny in the Organic Light Emitting Diode 4 of the pixel arrangement 20 of storage element 3.
Seeing also shown in Fig. 3-1, the 3-2, is the single pixel arrangement synoptic diagram of third embodiment of the present invention positive type organic light emitting diode display and the driving voltage waveform sequential chart of Fig. 3-1.As shown in the figure: the digital drive method and the device of positive type organic light emitting diode display of the present invention, mainly by many groups pixel (pixel) device 30,40 form, and with each pixel arrangement 30,40 Organic Light Emitting Diode (OLED) 4 is adopted the common cathode earthing mode, utilize control power lead 7 current potentials height, to realize writing the digital drive framework of shinny separation (ProgramDisplay Separated), when the input image data, power lead 7 current potentials are connected to zero potential (GND), make the Organic Light Emitting Diode 4 can't be shinny, when the image output data, then the current potential with power lead 7 is connected to positive potential VH, makes Organic Light Emitting Diode 4 shinny.
For realizing said method, pixel that the present invention adopts (pixel) device 30 comprises: a switch element 1, a driver element 2, a storage element 3 and an Organic Light Emitting Diode (OLED) 4; Wherein,
Above-mentioned switch element 1 can be the thin film transistor (TFT) (TFT) of P channel, and 1 liang of input end of this switch element 11,12 respectively is connected with one scan line (Scan Line) 5 and one data line (Data Line) 6 respectively and connects;
This driver element 2 can be the thin film transistor (TFT) (TFT) of P channel, and the input end of this driver element 2 connects 21 and connects power leads (SUPPLY LINE) 7, and other end input end 22 is connected with the output terminal 13 of above-mentioned switch element 1;
This storage element 3 is made of capacitor, and an end is connected in input end 22 junctions of output terminal 13 with the driver element 2 of switch element 1, and the other end then is connected in the sweep trace 8 of neighbor device 40;
The input end 41 of this Organic Light Emitting Diode (OLED) 4 is connected with the output terminal 23 of above-mentioned driver element 2, and output terminal 42 ground connection of Organic Light Emitting Diode (OLED) 4;
When this installs in the scan-image data, the current potential of power lead 7 is connected to zero potential GND, make the Organic Light Emitting Diode 4 can't be shinny, this switch element 1 presents conducting state, this moment, image data was entered in 1 li of switch element by data line 6, after sweep trace 5 scannings, and be stored in (also being after the switch element conducting) in the storage element 3 to the storage element charging, if image data is shinny, then store no-voltage GND in storage element 3, if image data for not shinny, then stores positive voltage VH in storage element 3; Sweep trace current potential in carrying out scanning process is zero potential GND, the current potential of other sweep trace then is positive potential VH, after waiting to finish all scanning motions, the current potential of power lead 7 is connected to positive potential VH, and makes storage no-voltage GND shinny in the Organic Light Emitting Diode 4 of the pixel arrangement 30 of storage element 3.
Above-mentioned is preferred embodiment of the present invention only, is not to be used for limiting scope of the invention process.Be that all equalizations of being done according to the present patent application claim change and modification, be all claim of the present invention and contain.
Claims (10)
1. the digital drive device of a positive type organic light emitting diode display, this display is made of a plurality of pixel arrangements (10), it is characterized in that each pixel arrangement (10) comprising:
One switch element (1) has two input ends (11), (12) and an output terminal (13) on it, this two input end (11), (12) connect data line (6) and sweep trace (5) respectively;
One driver element (2) has two input ends (21), (22) and an output terminal (23) on it, this two input end (21), (22) are connected with the output terminal (13) of said power (7) and above-mentioned switch element (1) respectively;
One storage element (3), an end ground connection on it, the other end then is connected in the output terminal (13) and driver element (2) input end (22) junction of above-mentioned switch element (1);
One Organic Light Emitting Diode (4) has an input end (41) and output terminal (42) on it, this input end (41) is connected with the output terminal (23) of this driver element (2), and output terminal (42) ground connection;
When this pixel arrangement (10) during in the scan-image data, the current potential of power lead (7) is connected to zero potential, make the Organic Light Emitting Diode (4) can't be shinny, this switch element (1) presents conducting state, this moment, image data was entered in switch element (1) lining by data line, after sweep trace (5) scanning, and be stored in the storage element (3), if image data is shinny, then store no-voltage in storage element (3), if image data is not for shinny, then storing positive electricity is pressed in the storage element (3), after waiting to finish all scanning motions, the current potential of power lead (7) is connected to positive potential, stores no-voltage in the Organic Light Emitting Diode shinny (4) of the pixel arrangement (10) of storage element (3) and make.
2. the digital drive device of positive type organic light emitting diode display according to claim 1, sweep trace (5) current potential that it is characterized in that carrying out in the scanning process is a zero potential, the current potential of other sweep trace (5) then is a positive potential.
3. the digital drive device of positive type organic light emitting diode display according to claim 1 is characterized in that this switch element (1) and driver element (2) can be the thin film transistor (TFT) (TFT) of P channel.
4. the digital drive device of positive type organic light emitting diode display according to claim 1 is characterized in that this storage element (3) is constituted by capacitor.
5. the digital drive method of a positive type organic light emitting diode display, this display is made of a plurality of pixel arrangements (20), and wherein each pixel arrangement (20) comprising:
One switch element (1) has two input ends (11), (12) and an output terminal (13) on it, this two input end (11), (12) connect data line (6) and sweep trace (5) respectively;
One driver element (2) has two input ends (11), (12) and an output terminal (13) on it, this two input end (11), (12) are connected with the output terminal (13) of said power (7) and above-mentioned switch element (1) respectively;
One storage element (3), end is connected in power lead (7) on it, and the other end then is connected in the output terminal (13) and driver element (2) input end (22) junction of above-mentioned switch element (1);
One Organic Light Emitting Diode (4) has an input end (41) and output terminal (42) on it, this input end (41) is connected with the output terminal (23) of this driver element (2), and output terminal (42) ground connection;
It is characterized in that: when this pixel arrangement (20) during in the scan-image data, the current potential of power lead (7) is connected to zero potential, make the Organic Light Emitting Diode (4) can't be shinny, this switch element (1) presents conducting state, this moment, image data was entered in switch element (1) lining by data line (6), after sweep trace (5) scanning, and be stored in the storage element (3), if image data is shinny, then storing negative electricity is pressed in the storage element (3), if image data is not for shinny, then store no-voltage in storage element (3), after waiting to finish all scanning motions, the current potential of power lead (7) is connected to positive potential, stores negative electricity to be pressed on the Organic Light Emitting Diode (4) of pixel arrangement (20) of storage element (3) shinny and make.
6. the digital drive method of positive type organic light emitting diode display according to claim 5 is characterized in that sweep trace (5) current potential in carrying out scanning process is a negative potential, and the current potential of other sweep trace (5) then is a positive potential.
7. the digital drive device of a positive type organic light emitting diode display, this display is made of a plurality of pixel arrangements (30), (40), it is characterized in that each pixel arrangement (30), (40) comprising:
One switch element (1) has two input ends (11), (12) and an output terminal (13) on it, this two input end (11), (12) connect data line (6) and sweep trace (5) respectively;
One driver element (2) has two input ends (21), (22) and an output terminal (23) on it, this two input end (21), (22) are connected with the output terminal (13) of said power (7) and above-mentioned switch element (1) respectively;
One storage element (3), end is connected in the output terminal (13) and driver element (2) input end (22) junction of above-mentioned switch element (1) on it, and the other end then is connected in the sweep trace (8) of neighbor device (40);
One Organic Light Emitting Diode (4) has an input end (41) and output terminal (13) on it, this input end (41) is connected with the output terminal (23) of this driver element (2), and output terminal (42) ground connection;
When this pixel arrangement (30), (40) when the scan-image data, the current potential of power lead (7) is connected to zero potential, make the Organic Light Emitting Diode (4) can't be shinny, this switch element (1) presents conducting state, this moment, image data was entered in switch element (1) lining by data line (6), after sweep trace (5) scanning, and be stored in the storage element (3), if image data is shinny, then store no-voltage in storage element (3), if image data is not for shinny, then storing positive electricity is pressed in the storage element (3), after waiting to finish all scanning motions, the current potential of power lead (7) is connected to positive potential, to store no-voltage shinny in the Organic Light Emitting Diode (4) of the pixel arrangement (30) of storage element (3) and make.
8. the digital drive device of positive type organic light emitting diode display according to claim 7, sweep trace (5) current potential that it is characterized in that carrying out in the scanning process is a zero potential, the current potential of other sweep trace (5) then is a positive potential.
9. the digital drive method of a positive type organic light emitting diode display, mainly formed by many groups pixel arrangement (30), (40), when it is characterized in that each pixel arrangement (30), (40) input image data, power lead (7) current potential is connected to zero potential, make the Organic Light Emitting Diode (4) can't be shinny, when the image output data, then the current potential with power lead (7) is connected to positive potential, makes Organic Light Emitting Diode (4) shinny.
10. the digital drive method of positive type organic light emitting diode display according to claim 7 is characterized in that and the Organic Light Emitting Diode (OLED) (4) of each pixel arrangement (30), (40) can be adopted the common cathode earthing mode.
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| CNB031018971A CN1332370C (en) | 2003-01-29 | 2003-01-29 | Digital drive method and apparatus for active organic light-emitting diode display |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB031018971A CN1332370C (en) | 2003-01-29 | 2003-01-29 | Digital drive method and apparatus for active organic light-emitting diode display |
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| CN1332370C true CN1332370C (en) | 2007-08-15 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2430069A (en) * | 2005-09-12 | 2007-03-14 | Cambridge Display Tech Ltd | Active matrix display drive control systems |
| JP5146090B2 (en) * | 2008-05-08 | 2013-02-20 | ソニー株式会社 | EL display panel, electronic device, and driving method of EL display panel |
| CN101605416B (en) * | 2008-06-13 | 2013-02-27 | 登丰微电子股份有限公司 | LED driving circuit and controller thereof |
| CN103268755B (en) * | 2013-05-28 | 2015-01-14 | 中国科学院上海高等研究院 | Active organic light emitting array driving system and driving method |
| CN105489158B (en) * | 2014-09-19 | 2018-06-01 | 深圳Tcl新技术有限公司 | OLED pixel driving circuit and television set |
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| JP2775040B2 (en) * | 1991-10-29 | 1998-07-09 | 株式会社 半導体エネルギー研究所 | Electro-optical display device and driving method thereof |
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