CN103700343A - AMOLED (Active Matrix/Organic Light Emitting Diode) pixel drive circuit and AMOLED pixel drive method - Google Patents
AMOLED (Active Matrix/Organic Light Emitting Diode) pixel drive circuit and AMOLED pixel drive method Download PDFInfo
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- CN103700343A CN103700343A CN201310705602.2A CN201310705602A CN103700343A CN 103700343 A CN103700343 A CN 103700343A CN 201310705602 A CN201310705602 A CN 201310705602A CN 103700343 A CN103700343 A CN 103700343A
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Abstract
An AMOLED (Active Matrix/Organic Light Emitting Diode) pixel drive circuit disclosed by the invention comprises a storage capacitor for a pixel unit, a digital-to-analog conversion unit, a data line and a Vavg power supply, the digital-to-analog conversion unit is used for converting digital signals into data voltage Vdata, the data line is connected with the digital-to-analog conversion unit and the storage capacitor, and the Vavg power supply is connected between the digital-to-analog conversion unit and the data line and used for precharging. The invention has the advantage that by arranging the Vavg power supply (generator) between the digital-to-analog conversion unit (DAC) of the conventional circuit and the data line for charging the storage capacitor and utilizing the Vavg power supply to store the data signal of the next cycle in advance, the AMOLED pixel drive circuit achieves the purpose of shortening the time of writing the data signal of the next cycle and reducing power consumption.
Description
Technical field
The invention belongs to technical field of flat panel display, relate to the pixel driver of active light emitting diode flat-panel monitor, particularly a kind of AMOLED pixel-driving circuit and driving method.
Background technology
In flat panel display, many merits such as display is frivolous with it for Organic Light Emitting Diode (Organic Light-Emitting Diode, OLED), active illuminating, fast-response speed, wide viewing angle, rich color and high brightness, low-power consumption, high-low temperature resistant and to be known as by industry be the third generation display technique after liquid crystal display (LCD).Active OLED(Active Matrix OLED, AMOLED) also referred to as active matrix OLED, AMOLED is because driving by integrated thin-film transistor (TFT) and capacitor in each pixel and by the method that capacitor maintains driving voltage, thereby can realize large scale, resolution panels, be the emphasis of current research and the developing direction of following display technique.
Figure 1 shows that the driving method of existing AMOLED pixel, to image element circuit, transmit data voltage, data voltage represents with data voltage or Vdata, and to energy-storage capacitor (storage capacitor, Cst) charging, holding capacitor Cst is constant for maintain this data voltage within the frame period, but the data voltage of charging only can maintain for 1 frame time like this.As can be seen from Figure 1, the duration of charging of this method reality is partially long, and the voltage differences that conversion obtains is bigger than normal, cause having there is higher Switching Power Supply power consumption, thereby cause the data voltage charge and discharge process of energy-storage capacitor (Cst) to there is the shortcoming that switch power consumption is higher and the required duration of charging is longer.
Summary of the invention
The object of the invention is in order to solve in existing AMOLED image element driving method/circuit, for maintaining the deficiency that holding capacitor charge and discharge process switch power consumption is high and the time that discharges and recharges is grown of pixel drive voltage, a kind of circuit and corresponding driving method of the AMOLED of being applicable to pixel driver proposed.
Technical scheme of the present invention is: AMOLED pixel-driving circuit, the holding capacitor that comprises pixel cell, digital signal is converted to the D/A conversion unit of data voltage Vdata, the data line that connects D/A conversion unit and holding capacitor, it is characterized in that, also comprise the Vavg power supply being connected between D/A conversion unit and data line for precharge.
Further, above-mentioned pixel-driving circuit also comprises for controlling the switch control unit of the charge and discharge process of Vavg power supply.
Further, the output voltage V avg of above-mentioned Vavg power supply be pixel data voltage Vdata peak value up and down and half.
Apply the image element driving method of the AMOLED of above-mentioned driving circuit, n the frame period that represents AMOLED by positive integer n, it is characterized in that, comprise step: at the n of AMOLED pixel cell, in the scan period, complete this pixel cell n cycle data signal and write with Vavg power supply n+1 periodic signal and write.
Further, half of the upper and lower peak value of data voltage that the output voltage of Vavg power supply is the n time.
Beneficial effect of the present invention: AMOLED pixel-driving circuit of the present invention is by the D/A conversion unit DAC at available circuit and for Vavg power supply (generator) being set between the data line that holding capacitor is charged, and utilize the data-signal in pre-stored next cycle of Vavg power supply, reached and shortened time that next cycle data signal writes and the object of power consumption.
Accompanying drawing explanation
Fig. 1 is the holding capacitor charge and discharge process schematic diagram of existing driving circuit;
Fig. 2 is pixel-driving circuit structure principle chart of the present invention;
Fig. 3 is that pixel-driving circuit of the present invention is to holding capacitor charge and discharge process schematic diagram;
Fig. 4 is the present invention and existing pixel-driving circuit charge and discharge process Contrast on effect diagram.
Embodiment
Following specific embodiment is that principle according to the present invention designs; object is technical scheme of the present invention to illustrate; its disclosed technical scheme scope is contained in the protection domain of technical scheme of the present invention but can not be equal to protection scope of the present invention, and below in conjunction with accompanying drawing and specific embodiment, the invention will be further elaborated.
As shown in Figure 2, Figure 3 and Figure 4, the AMOLED pixel-driving circuit of the present embodiment comprises the holding capacitor of pixel cell, digital signal is converted to the D/A conversion unit of data voltage Vdata, the data line that connects D/A conversion unit and holding capacitor, also comprises the Vavg power supply being connected between D/A conversion unit and data line for precharge.The Main Function of Vavg power supply is by storing in advance the data voltage in next cycle of this pixel cell, main advantage is pre-charged before being to charge to holding capacitor in next cycle, reaches and shortens time and the power consumption of independent data voltage to holding capacitor charging.
For the ease of the logic control of charging process, the present embodiment has further increased for controlling the switch control unit of the charge and discharge process of Vavg power supply in above-mentioned pixel-driving circuit.In order to optimize the time of discharging and recharging, reduce control system Vavg power-supply system complexity, as preferred version, the output voltage V avg of above-mentioned Vavg power supply adopt pixel data voltage Vdata peak value up and down and half.This voltage is generated according to data voltage by Vavg power supply.
Apply the image element driving method of the AMOLED of above-mentioned driving circuit, n the frame period that represents AMOLED by positive integer n, it is characterized in that, comprise step: at the n of AMOLED pixel cell, in the scan period, complete this pixel cell n cycle data signal and write with Vavg power supply n+1 periodic signal and write.
Based on the same consideration of Vavg electric power output voltage in foregoing circuit scheme, the output voltage of Vavg power supply is preferably half of the upper and lower peak value of data voltage of the n time.
Compared with prior art, the AMOLED pixel-driving circuit of the present embodiment is by the D/A conversion unit DAC at available circuit and for Vavg power supply (generator) being set between the data line that holding capacitor is charged, and utilize the data-signal in pre-stored next cycle of Vavg power supply, reached and shortened time that next cycle data signal writes and the object of power consumption.
Those of ordinary skill in the art will appreciate that, embodiment described here is in order to help reader understanding's principle of the present invention, should be understood to that protection scope of the present invention is not limited to such special statement and embodiment.Those of ordinary skill in the art can make various other various concrete distortion and combinations that do not depart from essence of the present invention according to these technology enlightenments disclosed by the invention, and these distortion and combination are still in protection scope of the present invention.
Claims (5)
1.AMOLED pixel-driving circuit, the holding capacitor that comprises pixel cell, digital signal is converted to the D/A conversion unit of data voltage Vdata, the data line that connects D/A conversion unit and holding capacitor, it is characterized in that, also comprise the Vavg power supply being connected between D/A conversion unit and data line for precharge.
2. pixel-driving circuit according to claim 1, is characterized in that, circuit also comprises for controlling the switch control unit of the charge and discharge process of Vavg power supply.
3. pixel-driving circuit according to claim 1 and 2, is characterized in that, the output voltage V avg of Vavg power supply be pixel data voltage Vdata peak value up and down and half.
4. application rights requires the image element driving method of AMOLED of driving circuit of any one claim of 1-3, n the frame period that represents AMOLED by positive integer n, it is characterized in that, comprise step: at the n of AMOLED pixel cell, in the scan period, complete this pixel cell n cycle data signal and write with Vavg power supply n+1 periodic signal and write.
5. method according to claim 4, is characterized in that, half of the upper and lower peak value of data voltage that the output voltage of Vavg power supply is the n time.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310705602.2A CN103700343B (en) | 2013-12-20 | 2013-12-20 | AMOLED pixel-driving circuit and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310705602.2A CN103700343B (en) | 2013-12-20 | 2013-12-20 | AMOLED pixel-driving circuit and method |
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| CN103700343A true CN103700343A (en) | 2014-04-02 |
| CN103700343B CN103700343B (en) | 2017-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310705602.2A Expired - Fee Related CN103700343B (en) | 2013-12-20 | 2013-12-20 | AMOLED pixel-driving circuit and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106057129A (en) * | 2016-08-24 | 2016-10-26 | 中国科学院上海高等研究院 | AMOLED display driving circuit and driving method thereof |
| CN112289258A (en) * | 2020-11-06 | 2021-01-29 | 昆山工研院新型平板显示技术中心有限公司 | Driving method of pixel circuit, pixel circuit and display panel |
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| US20060071928A1 (en) * | 2004-10-06 | 2006-04-06 | Seiko Epson Corporation | Power source circuit, display driver, electro-optic device and electronic apparatus |
| US7286071B1 (en) * | 2006-08-14 | 2007-10-23 | Ipo Displays Corp | System for displaying images |
| CN102063885A (en) * | 2010-07-20 | 2011-05-18 | 矽创电子股份有限公司 | Drive circuit of display panel |
| CN202003648U (en) * | 2011-01-28 | 2011-10-05 | 深圳华映显示科技有限公司 | Pixel structure with precharge function |
| CN202975544U (en) * | 2012-07-18 | 2013-06-05 | 京东方科技集团股份有限公司 | Pixel structure and TFT-LCD array substrate |
-
2013
- 2013-12-20 CN CN201310705602.2A patent/CN103700343B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060071928A1 (en) * | 2004-10-06 | 2006-04-06 | Seiko Epson Corporation | Power source circuit, display driver, electro-optic device and electronic apparatus |
| US7286071B1 (en) * | 2006-08-14 | 2007-10-23 | Ipo Displays Corp | System for displaying images |
| CN102063885A (en) * | 2010-07-20 | 2011-05-18 | 矽创电子股份有限公司 | Drive circuit of display panel |
| CN202003648U (en) * | 2011-01-28 | 2011-10-05 | 深圳华映显示科技有限公司 | Pixel structure with precharge function |
| CN202975544U (en) * | 2012-07-18 | 2013-06-05 | 京东方科技集团股份有限公司 | Pixel structure and TFT-LCD array substrate |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106057129A (en) * | 2016-08-24 | 2016-10-26 | 中国科学院上海高等研究院 | AMOLED display driving circuit and driving method thereof |
| CN112289258A (en) * | 2020-11-06 | 2021-01-29 | 昆山工研院新型平板显示技术中心有限公司 | Driving method of pixel circuit, pixel circuit and display panel |
| CN112289258B (en) * | 2020-11-06 | 2021-12-14 | 昆山工研院新型平板显示技术中心有限公司 | Driving method of pixel circuit, pixel circuit and display panel |
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| CN103700343B (en) | 2017-01-04 |
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