CN1828708A - Method and circuit for operating passive matrix type organic light-emitting diode display panel - Google Patents

Method and circuit for operating passive matrix type organic light-emitting diode display panel Download PDF

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Publication number
CN1828708A
CN1828708A CNA2005100514097A CN200510051409A CN1828708A CN 1828708 A CN1828708 A CN 1828708A CN A2005100514097 A CNA2005100514097 A CN A2005100514097A CN 200510051409 A CN200510051409 A CN 200510051409A CN 1828708 A CN1828708 A CN 1828708A
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current
emitting diode
organic light
passive matrix
matrix type
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CN100419839C (en
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林显峰
杨世杰
杨证咏
陈健忠
蔡键贤
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Richtek Technology Corp
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Richtek Technology Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

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Abstract

Wherein, the method comprises: scanning column, and/or reducing drive current and period to local picture or selected area. This invention can prolongs lifetime of PMOLED (passive matrix-type LED) display.

Description

The method of operating passive matrix type organic light-emitting diode display panel and circuit
Technical field
The invention relates to a kind of passive matrix type organic light-emitting diode (PMOLED) display pannel, particularly about a kind of method of operating passive matrix type organic light-emitting diode display panel.
Background technology
Organic Light Emitting Diode (OLED) display has many advantages that surmount other flat-panel screens (FPD), comprise that consumed power is low, high brightness reaches manufacturing easily etc., therefore but can't reach the level of other flat-panel screens its serviceable life, improving the OLED display pannel life-span becomes a main problem always.The OLED display can be divided into active-matrix formula Organic Light Emitting Diode (AMOLED) display pannel and passive matrix type organic light-emitting diode (PMOLED) display pannel two classes according to the structure of its array of pixels, at United States Patent (USP) the 6th, 023, disclose a kind of driving method that improves the AMOLED life-span in No. 259, but never be suggested at improving PMOLED display pannel method of life.As shown in Figure 1, the method for known driving PMOLED display pannel comprises that panel 106 comprises WL with row driver block 102 and column driver block 104 drivings one PMOLED display pannel 106 0To WL mM is listed as altogether, and each row all has n pixel (Cell 0_ WL iTo Cell n_ WL i), mode by continuous sweep provides drive current to the pixel in the panel 106, as shown in Figure 2, each row in the panel 106, constantly driven sequentially by voltage source V DD and adjacent two row between have a time interval, the drive current I when requiring specifications to set normal the demonstration according to display pannel 106 commercial pictures OrgWith its drive cycle T OrgTo reach the purpose of demonstration.This method causes the power consumption of PMOLED display pannel to reduce and the life-span can't promote, because counter plate 106 is done constantly to drive in proper order and scan, make power consumption to reduce, and the luminosity of PMOLED is directly proportional with drive current, as shown in Figure 3, raising drive current and drive cycle can obtain better display quality in permissible range, but the product of the life-span of PMOLED with drive current and service time becomes negative correlation, therefore often sacrificed the life-span of PMOLED and made power consumption to reduce for obtaining better display quality.
Therefore, a kind of PMOLED of increasing display pannel life-span, reducing consumed power and do not cause the method for display quality deterioration, is to be the institute Ji.
Summary of the invention
One of purpose of the present invention is to provide a kind of method of operating passive matrix type organic light-emitting diode display panel.
According to the present invention, a kind of method of operating passive matrix type organic light-emitting diode display panel, comprise that the row in one or the multizone of choosing in the picture to this passive matrix type organic light-emitting diode display panel only scan, and/or at this one or multizone in pixel reduce its drive current and shorten the two one at least of its drive cycle.
The present invention also provides a kind of circuit of operating passive matrix type organic light-emitting diode display panel, comprising: a current source, in order to determine the normal drive current of a pixel in this passive matrix type organic light-emitting diode display panel; And a current mirror, from this normal drive current mirror one mirror electric current to drive this pixel.
According to the present invention, can increase the PMOLED display pannel life-span, reduce consumed power and not cause the display quality deterioration.
Description of drawings
Fig. 1 is the synoptic diagram of the method for the existing PMOLED of driving display pannel;
Fig. 2 is the synoptic diagram of existing scanning PMOLED display pannel and drive current and its drive cycle;
Fig. 3 is the graph of a relation of PMOLED luminosity and drive current;
Fig. 4 is the synoptic diagram that drives the method for PMOLED display pannel according to the present invention;
Fig. 5 is the synoptic diagram according to the control circuit of PMOLED display pannel of the present invention;
Fig. 6 is a synoptic diagram according to an embodiment of the invention;
Fig. 7 is a synoptic diagram according to another embodiment of the present invention; And
Fig. 8 is the synoptic diagram according to further embodiment of this invention.
Symbol description:
102 row driver block
104 column driver block
106 PMOLED display pannels
402 row driver block
404 column driver block
406 PMOLED display pannels
408 zones of choosing
500 control circuits
502 voltage sources
503 transistors
504 transistors
505 transistors
506 current-controlled switches
508 time control switchs
510 PMOLED display pannels
512 current sources
Embodiment
As shown in Figure 4, according to the present invention, a kind of method of operating passive matrix type organic light-emitting diode display panel comprises uses two Drive Modules, for example row driver block 402 and column driver block 404, with current drives PMOLED display pannel 406, panel 406 comprises WL 0To WL mM is listed as altogether, and each row all has n pixel (Cell 0_ WL iTo Cell n_ WL i); when PMOLED display pannel 406 at some specific states; when for example holding state, screen protection, demonstration tableaux or picture change at a slow speed; choose the zone 408 in whole PMOLED panel 406 pictures; image panel 406 each row in the scanning panel 406 and drive pixel in each row when normal the demonstration not; only by the specific row of scanning panel 406, the row (WL in the zone 408 for example jTo WL h), and the pixel during each is listed as in the drive area 408, for example Cell kTo Cell iCan reach picture shows, this moment is by the drive current and the drive cycle thereof of these pixels in the adjustment region 408, brightness, sharpness that makes this picture etc. reaches the visually cognizable minimum standard of user, to increase the life-span of panel 406, in addition, because voltage source V DD does not constantly scan the row in the whole front panel 406, only the row in the zone 408 are scanned, also reach the purpose that reduces power consumption.
As shown in Figure 5, according to the present invention, a kind of control circuit 500 of PMOLED display pannel comprises that a voltage source V DD502 is in order to scan a PMOLED display pannel 510, several transistors 503 with different length breadth ratios, 504,505 current mirrors of forming are as the driver of pixel in the panel 510, transistor 503,504 and 505 length breadth ratio is respectively m (W/L), n (W/L) reaches (W/L), an one current-controlled switch SW_I506 and a time gauge tap SW_T508 pass through the size of the drive current of pixel in the panel 510 and the length of drive cycle thereof in order to adjustment, and the drive current I_ of a pixel when normal demonstration of a current source 512 decision panels 510 OrgWhen the SW_I506 conducting, transistor 503,504 is state in parallel and forms a current mirror with transistor 505 that this moment is from this normal drive current mirror one mirror electric current
Figure A20051005140900071
By the pixel in the panel 510, when SW_I506 when opening circuit, transistor 503 is formed a current mirror with transistor 505, this moment is from this normal drive current mirror one mirror electric current
Figure A20051005140900073
By the pixel in the panel 510, can adjust size by the drive current of pixel in the panel 510 via the switch of control SW_I506.In addition, can adjust the length of its drive cycle by the time of control SW_T508 conducting, reach the purpose that prolongs 510 life-spans of panel.
Fig. 6 is according to one embodiment of the invention synoptic diagram, cooperates Fig. 4 to be described as follows.With the row (WL in the from top to bottom continuous scanning area 408 sequentially of a voltage source V DD jTo WL h), then do not scan for the row beyond the zone 408, and right by a left side to the pixel (Cell in each row in the zone 408 kTo Cell i) supply with drive current and drive cycle thereof, with pixel (Cell in the supply area 408 kTo Cell i) the drive cycle of drive current by normal T OrgShorten to T Mod, T wherein ModKeep picture quality more than the visually cognizable minimum standard of user, to reach the purpose that prolongs 406 life-spans of panel but do not influence picture quality, in addition, the row (WL in voltage source V DD scanning area 408 in the present embodiment jTo WL h), but not all row in the scanning whole front panel 406 are also reached the purpose that reduces power consumption.
Fig. 7 is according to another embodiment of the present invention synoptic diagram, cooperates Fig. 4 to be described as follows.With the row (WL in the from top to bottom continuous scanning area 408 sequentially of a voltage source V DD jTo WL h), then do not scan for the row beyond the zone 408, and right by a left side to the pixel (Cell in each row in the zone 408 kTo Cell i) supply with drive current and drive cycle thereof, with pixel (Cell in the supply area 408 kTo Cell i) drive current by normal I OrgBe reduced to I Mod, I wherein ModKeep picture quality more than the visually cognizable minimum standard of user, to reach the purpose that prolongs 406 life-spans of panel but do not influence picture quality, in addition, the row (WL in voltage source V DD scanning area 408 in the present embodiment jTo WL h), also reach the purpose that reduces power consumption.
Fig. 8 is according to further embodiment of this invention synoptic diagram, cooperates Fig. 4 to be described as follows.With the row (WL in the from top to bottom continuous scanning area 408 sequentially of a voltage source V DD jTo WL h), then do not scan for the row beyond the zone 408, and right by a left side to the pixel (Cell in each row in the zone 408 kTo Cell i) supply with drive current and drive cycle thereof, with pixel (Cell in the supply area 408 kTo Cell i) the drive cycle of drive current by normal T OrgShorten to T ModAnd with drive current by normal I OrgBe reduced to I Mod, T wherein ModAnd I ModKeep picture quality more than the visually cognizable minimum standard of user, to reach the purpose that prolongs 406 life-spans of panel but do not influence picture quality, in addition, the row (WL in voltage source V DD scanning area 408 in the present embodiment jTo WL h), also reach the purpose that reduces power consumption.
The present invention dwindles drive current and drive cycle thereof to the pixel of partial picture, thereby reach the purpose that prolongs the PMOLED display pannel life-span but do not influence picture quality, in addition, voltage source only scans the purpose that the minimizing consumed power is also reached in the zone of choosing in the picture.

Claims (8)

1. the method for an operating passive matrix type organic light-emitting diode display panel comprises the following steps:
From the picture of this passive matrix type organic light-emitting diode display panel, choose one or multizone; And
Only to this one or multizone in row scan.
2. method according to claim 1, more comprise shorten this one or multizone in the drive cycle of one or many pixels.
3. method according to claim 1, more comprise reduce this one or multizone in the drive current of one or many pixels.
4. method according to claim 1, more comprise shorten and reduce this one or multizone in the drive cycle and the drive current of one or many pixels.
5. the circuit of an operating passive matrix type organic light-emitting diode display panel comprises:
One current source is in order to determine the normal drive current of a pixel in this passive matrix type organic light-emitting diode display panel; And
One current mirror, from this normal drive current mirror one mirror electric current to drive this pixel.
6. circuit according to claim 5, wherein this current mirror comprises a current-controlled switch, to adjust the size of this mirror electric current.
7. circuit according to claim 5 more comprises a time gauge tap between this current mirror and this passive matrix type organic light-emitting diode display panel, to adjust the drive cycle of this pixel.
8. circuit according to claim 5, wherein this current mirror comprises that a current-controlled switch is to adjust the size of this mirror electric current, and one the time gauge tap between this current mirror and this passive matrix type organic light-emitting diode display panel, to adjust the drive cycle of this pixel.
CNB2005100514097A 2005-03-02 2005-03-02 Method and circuit for operating passive matrix type organic light-emitting diode display panel Expired - Fee Related CN100419839C (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102184708A (en) * 2011-05-11 2011-09-14 冠捷显示科技（厦门）有限公司 Novel passive matrix driving device for local backlight regulation

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EP0474231B1 (en) * 1990-09-06 1996-12-04 Canon Kabushiki Kaisha Electronic device
US5867140A (en) * 1996-11-27 1999-02-02 Motorola, Inc. Display system and circuit therefor
US6023259A (en) * 1997-07-11 2000-02-08 Fed Corporation OLED active matrix using a single transistor current mode pixel design
JP2001147659A (en) * 1999-11-18 2001-05-29 Sony Corp Display device
CN1555548A (en) * 2001-09-20 2004-12-15 先锋株式会社 Drive circuit for light emitting elements
KR100442257B1 (en) * 2002-01-09 2004-07-30 엘지전자 주식회사 Data Derive Circuit of Active Matrix Organic Electroluminescence of Current Writing Type
JP3707680B2 (en) * 2002-01-25 2005-10-19 松下電器産業株式会社 Drive voltage control device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102184708A (en) * 2011-05-11 2011-09-14 冠捷显示科技（厦门）有限公司 Novel passive matrix driving device for local backlight regulation

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