CN101923829A - Organic luminous display of active matrix - Google Patents
Organic luminous display of active matrix Download PDFInfo
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- CN101923829A CN101923829A CN2010102136065A CN201010213606A CN101923829A CN 101923829 A CN101923829 A CN 101923829A CN 2010102136065 A CN2010102136065 A CN 2010102136065A CN 201010213606 A CN201010213606 A CN 201010213606A CN 101923829 A CN101923829 A CN 101923829A
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- active matrix
- light emitting
- organic light
- emitting display
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Abstract
The invention relates to an organic luminous display of an active matrix, in particular to an organic luminous display of an active matrix, which is provided with a driving circuit capable of inhibiting the characteristic drift of a thin film transistor and prolonging the service life of the display. A current meter and a corresponding controller are configured in the driving output position of each pixel unit array in the organic luminous display of the active matrix so as to detect and correct the current of corresponding pixel units and solve the problem of the characteristic drift of the thin film transistor in a display panel, therefore, the service life of the display is improved.
Description
Technical field
The present invention relates to a kind of active matrix/organic light emitting display, relate in particular to a kind of active matrix/organic light emitting display that can suppress the tft characteristics drift, prolong the driving circuit of display life that has.
Background technology
In recent years, because in light weight, advantage such as volume is little, flat-panel monitor especially LCD (LCD) and organic light emitting display (OLED) is widely used in display terminals such as cell phone, digital camera, notebook computer and flat panel TV.Owing to have brightness, viewing angle properties, response speed and the display effect that is better than LCD, OLED is acknowledged as flat-panel monitor of future generation, and particularly the advantage of active-matrix organic light emitting display (AMOLED) is more outstanding.AMOLED realizes luminous Presentation Function by form the OLED pixel device on thin film transistor (TFT) (TFT) array base palte.Usually on glass substrate, prepare tft array substrate, have polytype device to be attempted at present, comprise amorphous silicon (a-Si) TFT, low temperature polycrystalline silicon (LTPS) TFT and microcrystal silicon (u-Si) TFT etc.Because the TFT grid of driving OLED device places the forward bias state for a long time, raceway groove has electric current to flow through, and causes electric charge to be captured in the gate insulation layer, and produces defect state in the channel semiconductor layer, and the TFT threshold voltage is drifted about.For above-mentioned a-Si TFT, LTPS TFT and u-Si TFT all can the generating device characteristic drift, wherein serious with a-Si TFT especially.Eliminate this drift if do not take measures, the electric current of the TFT driving OLED of occurrence features drift can descend, and causes that display device brightness reduces, and will cause the device premature failure.Therefore suppressing the TFT characteristic drift is to guarantee the AMOLED image quality, the important measures that prolong device lifetime.
Summary of the invention
At the problems referred to above, the purpose of this invention is to provide a kind of active matrix/organic light emitting display, to solve the problem of TFT characteristic drift, display life reduction.
The objective of the invention is to be achieved by following technical solution:
The invention provides a kind of active matrix/organic light emitting display, comprise being disposed at a plurality of pixel cells that are arranged on the substrate; Act on the driving circuit of each pixel cell, comprise being disposed at the current measurement meter that drives output place, be used to realize to the real-time detection of the required electric current of each pixel of respective column and produce detection signal; With controller, be used to calculate the data input signal that acts on each pixel cell and this data input signal is applied to the data line end that is used to drive each pixel cell, thereby compensate the variation of the output of each pixel cell in response to this detection signal.
Above-mentioned controller further comprises the comparer that is used for more described detection signal and reference current, and produces correction signal; Also comprise question blank in response to described correction signal, be used to handle this correction signal and produce act on each pixel cell and with the data input signal of the corresponding GTG of input video data.
Technical solution of the present invention can effectively solve the problem of TFT characteristic drift, improves display life, adopts the design of simplifying simultaneously, reduces the driving circuit improvement cost.
Description of drawings
Fig. 1 is the pixel-driving circuit structural drawing of prior art;
Fig. 2 is a driving circuit schematic diagram of the present invention;
Fig. 3 is a pixel-driving circuit structural drawing shown in Figure 2.
Embodiment
For allowing foregoing of the present invention become apparent, preferred embodiment cited below particularly, and be described in detail below in conjunction with the accompanying drawings.
Fig. 1 is the pixel-driving circuit structural drawing of prior art, and as shown in the figure, this dot structure comprises, one scan line (V
Sel) 101, one data lines (VSD), 102, one drive wires (VDD), 103, one switching thin-film transistors (T1) 104, a drive thin film transistors (T2) 105, a storage capacitors (Cs) 106 and an OLED luminescent device 107.Dashed region shown in the figure is a pixel region, each pixel receives the data-signal of VSD, and by the VDD driven for emitting lights, but after characteristic drift appears in drive thin film transistors T2, this pixel-driving circuit can not be made any reaction to this, therefore display brightness can reduce, and the display device life-span will shorten.
Embodiment
Fig. 2 is a driving circuit schematic diagram of the present invention.As shown in Figure 2, the present invention increases a current measurement meter 202 in driving output place of VDD 201, image element circuit is by Vsel gate driver circuit 203, open the grid of certain row on pixel successively according to sequential, provide pixel required data voltage signal by VSD 204, provide drive current for pixel cell 205 by VDD 201.The present invention can realize the real-time detection to the required electric current of respective column pixel by being arranged on the current measurement meter 202 of VDD 201 all or part of driving outputs place that list.Further as shown in Figure 3, Fig. 3 is a pixel-driving circuit structural drawing shown in Figure 2, the pixel peripheral circuit has comparer 302, is used for the variation of the detection signal of comparison current measurement meter 301 outputs with respect to reference current, and comparer 302 output signals feed back to question blank (LUT) 303; Video data 304 is used to import the shows signal of different GTGs, with comparer 302 output signals be used to jointly produce with the data input signal of importing the corresponding GTG of video data to data line (VSD) 305.
When certain pixel cell 306 since in its pixel element off-design value or decay serious, its current value can depart from, the current measurement meter 301 that VDD 307 drives outputs place can detect the variation of current value in real time and produce relevant detection signal S
1,, can calculate the deviation of actual current and reference current and produce corresponding correction signal S by the detection of comparer 302 to its departure degree
2, and this correction signal fed back to question blank 303, question blank 303 is proofreaied and correct the input signal of video data 304 according to this correction signal, and the data input signal S after will proofreading and correct
3Be input to data line (VSD) 305, show to realize correct GTG.
The present invention can drive output place configuration current measurement meter at the VDD of whole pixel cell row, so that all pixels are detected and proofread and correct; Can also drive output place configuration current measurement meter at the VDD of partial pixel cell columns, so that the pixel fragment that occurs device decay drift is easily detected and proofreaies and correct.After the correction signal of comparer output enters LUT, can only proofread and correct, also can proofread and correct a plurality of GTGs to the maximum gray of input data.
Adopt technical solution of the present invention, can effectively solve the problem of active matrix/organic light emitting display TFT characteristic drift, improve the serviceable life of display panels such as mobile communication equipment, video playback apparatus, display device.
Though the present invention is to disclose as above than preferable embodiment; yet it is not in order to limit the present invention; anyly be familiar with this technology personage; without departing from the spirit and scope of the present invention; when being used for a variety of modifications and variations; therefore, protection scope of the present invention is as the criterion when the claim with application defines.
Claims (10)
1. active matrix/organic light emitting display comprises:
A) be disposed at a plurality of pixel cells that are arranged on the substrate;
B) act on the driving circuit of each pixel cell, comprise being disposed at the current measurement meter that drives output place, be used to realize to the real-time detection of the required electric current of each pixel of respective column and produce detection signal; With
C), be used to calculate the data input signal that acts on each pixel cell and this data input signal is applied to the data line that is used to drive each pixel cell, thereby compensate the variation of the output of each pixel cell in response to the controller of this detection signal.
2. active matrix/organic light emitting display as claimed in claim 1, described controller further comprises the comparer that is used for more described detection signal and reference current, and produces correction signal.
3. active matrix/organic light emitting display as claimed in claim 2, described controller further comprises the question blank in response to described correction signal, be used to handle this correction signal and produce act on each pixel cell and with the data input signal of the corresponding GTG of input video data.
4. active matrix/organic light emitting display as claimed in claim 3, described question blank are only proofreaied and correct the maximum gray of input data.
5. active matrix/organic light emitting display as claimed in claim 3, described question blank are only proofreaied and correct input section data GTG.
6. active matrix/organic light emitting display as claimed in claim 3, described current measurement meter are disposed at driving output place of whole pixel cell row, are used for all pixel cells are detected.
7. active matrix/organic light emitting display as claimed in claim 3, described current measurement meter is disposed at driving output place of partial pixel cell columns, is used for the pixel cell that is prone to the device decay is detected.
8. mobile communication equipment, described mobile communication equipment comprises active matrix/organic light emitting display as claimed in claim 1.
9. video playback apparatus, described video playback apparatus comprises active matrix/organic light emitting display as claimed in claim 1.
10. display device, described display device comprises active matrix/organic light emitting display as claimed in claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102136065A CN101923829A (en) | 2010-06-30 | 2010-06-30 | Organic luminous display of active matrix |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102136065A CN101923829A (en) | 2010-06-30 | 2010-06-30 | Organic luminous display of active matrix |
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| CN101923829A true CN101923829A (en) | 2010-12-22 |
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| CN2010102136065A Pending CN101923829A (en) | 2010-06-30 | 2010-06-30 | Organic luminous display of active matrix |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104537969A (en) * | 2014-12-26 | 2015-04-22 | 深圳创维－Rgb电子有限公司 | Method and device for recovering performance of OLED |
| WO2019144669A1 (en) * | 2018-01-29 | 2019-08-01 | 京东方科技集团股份有限公司 | Detection method for pixel circuit, driving method for display panel, and display device |
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| US20050259054A1 (en) * | 2003-04-14 | 2005-11-24 | Jie-Farn Wu | Method of driving organic light emitting diode |
| WO2006097329A1 (en) * | 2005-03-18 | 2006-09-21 | Austriamicrosystems Ag | Arrangement provided with a voltage converter for supplying voltage to an electrical charge and associated method |
| CN101038727A (en) * | 2006-03-15 | 2007-09-19 | 精工爱普生株式会社 | Light-emitting device, method for driving the same, and electronic apparatus |
| CN101226412A (en) * | 2007-01-18 | 2008-07-23 | 株式会社理光 | Constant-current circuit and light-emitting diode drive device therewith |
| CN101661706A (en) * | 2003-08-06 | 2010-03-03 | 日本电气株式会社 | Display driving circuit and display device using the same |
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- 2010-06-30 CN CN2010102136065A patent/CN101923829A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10116040A (en) * | 1996-10-11 | 1998-05-06 | Nippon Signal Co Ltd:The | Led display device with state detective function |
| US20050259054A1 (en) * | 2003-04-14 | 2005-11-24 | Jie-Farn Wu | Method of driving organic light emitting diode |
| CN101661706A (en) * | 2003-08-06 | 2010-03-03 | 日本电气株式会社 | Display driving circuit and display device using the same |
| WO2006097329A1 (en) * | 2005-03-18 | 2006-09-21 | Austriamicrosystems Ag | Arrangement provided with a voltage converter for supplying voltage to an electrical charge and associated method |
| CN101038727A (en) * | 2006-03-15 | 2007-09-19 | 精工爱普生株式会社 | Light-emitting device, method for driving the same, and electronic apparatus |
| CN101226412A (en) * | 2007-01-18 | 2008-07-23 | 株式会社理光 | Constant-current circuit and light-emitting diode drive device therewith |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104537969A (en) * | 2014-12-26 | 2015-04-22 | 深圳创维－Rgb电子有限公司 | Method and device for recovering performance of OLED |
| WO2019144669A1 (en) * | 2018-01-29 | 2019-08-01 | 京东方科技集团股份有限公司 | Detection method for pixel circuit, driving method for display panel, and display device |
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Application publication date: 20101222 |