CN103700343B - AMOLED pixel-driving circuit and method - Google Patents
AMOLED pixel-driving circuit and method Download PDFInfo
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- CN103700343B CN103700343B CN201310705602.2A CN201310705602A CN103700343B CN 103700343 B CN103700343 B CN 103700343B CN 201310705602 A CN201310705602 A CN 201310705602A CN 103700343 B CN103700343 B CN 103700343B
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Abstract
The AMOLED pixel-driving circuit of the present invention, storage capacitor including pixel cell, convert digital signals into the D/A conversion unit of data voltage Vdata, connect D/A conversion unit and the data wire of storage capacitor, also include being connected between D/A conversion unit and data wire the Vavg power supply for precharge.Have the beneficial effects that, the AMOLED pixel-driving circuit of the present invention is by arranging Vavg power supply (electromotor) at the D/A conversion unit DAC of available circuit and between to the data wire of storage capacitor charging, and utilize Vavg power supply to prestore the data signal in next cycle, reach to shorten time and the purpose of power consumption of the write of next periodic data signals.
Description
Technical field
The invention belongs to technical field of flat panel display, relate to the pixel driver of active light emitting diode flat faced display, especially
Relate to a kind of AMOLED pixel-driving circuit and driving method.
Background technology
In flat panel display, Organic Light Emitting Diode (Organic Light-Emitting Diode, OLED) display with
It is frivolous, active illuminating, fast-response speed, wide viewing angle, rich color and high brightness, low-power consumption, high-low temperature resistant etc. numerous
Advantage and be known as being the third generation Display Technique after liquid crystal display (LCD) by industry.Active OLED(Active
Matrix OLED, AMOLED) it is also referred to as Activematric OLED, AMOLED is because of by the most integrated thin
Film transistor (TFT) and capacitor are also maintained the method for driving voltage to be driven by capacitor, thus can realize large scale,
Resolution panels, is emphasis and the developing direction of following Display Technique of current research.
Fig. 1 show the driving method of existing AMOLED pixel, transmits data voltage, data voltage to image element circuit
Represent with data voltage or Vdata, and charge to energy-storage capacitor (storage capacitor, Cst), store electric capacity
Device Cst is for maintaining this data voltage constant within the frame period, but the data voltage of so charging is only capable of maintaining for 1 frame time.
It will be seen from figure 1 that this method actual charging interval is the longest, and the voltage differences that conversion obtains is bigger than normal, causes having
Higher Switching Power Supply power consumption, thus cause the data voltage charge and discharge process of energy-storage capacitor (Cst) to have switching power loss relatively
The shortcoming that high and required charging interval is longer.
Summary of the invention
The invention aims to solve, in existing AMOLED image element driving method/circuit, to be used for maintaining pixel driver
The storage capacitor charging/discharging process switching power loss height of voltage and the deficiency of discharge and recharge time length, it is proposed that one is applicable to
The circuit of AMOLED pixel driver and corresponding driving method.
The technical scheme is that AMOLED pixel-driving circuit, including the storage capacitor of pixel cell, numeral is believed
Number be converted to the D/A conversion unit of data voltage Vdata, connect D/A conversion unit and the data wire of storage capacitor, its
It is characterised by, also includes being connected between D/A conversion unit and data wire the Vavg power supply for precharge.
Further, above-mentioned pixel-driving circuit also includes the switch control unit of the charge and discharge process for controlling Vavg power supply.
Further, the output voltage Vavg of above-mentioned Vavg power supply be pixel data voltage Vdata the sum of peak value up and down one
Half.
Apply the image element driving method of the AMOLED of above-mentioned drive circuit, represent the n-th frame week of AMOLED by positive integer n
Phase, it is characterised in that include step: complete this pixel cell within the n-th scan period of AMOLED pixel cell n-th week
The write of phase data signal and Vavg power supply the (n+1)th periodic signal write.
Further, the output voltage of Vavg power supply is the half of the upper and lower peak value of data voltage of n-th.
Beneficial effects of the present invention: the AMOLED pixel-driving circuit of the present invention is by the D/A conversion unit DAC at available circuit
And for arranging Vavg power supply (electromotor) between the data wire of storage capacitor charging, and Vavg power supply is utilized to deposit in advance
Store up the data signal in next cycle, reach to shorten time and the purpose of power consumption of the write of next periodic data signals.
Accompanying drawing explanation
Fig. 1 is the storage capacitor charging/discharging process schematic of existing drive circuit；
Fig. 2 is the pixel-driving circuit structure principle chart of the present invention；
Fig. 3 is that the pixel-driving circuit of the present invention is to storage capacitor charging/discharging process schematic；
Fig. 4 is that the present invention illustrates with existing pixel-driving circuit charge and discharge process Contrast on effect.
Detailed description of the invention
Specific examples below is to design according to the principle of the present invention, it is therefore intended that does technical scheme and illustrates
Bright, technical scheme scope disclosed in it is contained in the protection domain of technical scheme but can not be equal to the present invention
Protection domain, the invention will be further elaborated with specific embodiment below in conjunction with the accompanying drawings.
Shown in as shown in Figure 2, Figure 3 and Figure 4, the AMOLED pixel-driving circuit of the present embodiment includes the storage electric capacity of pixel cell
Device, converts digital signals into the D/A conversion unit of data voltage Vdata, connects D/A conversion unit and storage capacitor
Data wire, also include being connected between D/A conversion unit and data wire the Vavg power supply for precharge.Vavg power supply
Main Function is the data voltage by storing next cycle of this pixel cell in advance, and main advantage is can be in next week
Phase, to precharge before storage capacitor charging, reaches time and the merit shortening single data voltage to storing capacitor charging
Consumption.
For the ease of the logic control of charging process, the present embodiment adds for controlling further in above-mentioned pixel-driving circuit
The switch control unit of the charge and discharge process of Vavg power supply processed.In order to optimize the discharge and recharge time, reduce control system Vavg electricity
Origin system complexity, preferably, the output voltage Vavg of above-mentioned Vavg power supply uses pixel data voltage Vdata
The half of the sum of peak value up and down.This voltage is generated according to data voltage by Vavg power supply.
Apply the image element driving method of the AMOLED of above-mentioned drive circuit, represent the n-th frame week of AMOLED by positive integer n
Phase, it is characterised in that include step: complete this pixel cell within the n-th scan period of AMOLED pixel cell n-th week
The write of phase data signal and Vavg power supply the (n+1)th periodic signal write.
Based on Vavg electric power output voltage same consideration in foregoing circuit scheme, the output voltage of Vavg power supply is preferably n-th
The half of the upper and lower peak value of secondary data voltage.
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 arranging Vavg power supply (electromotor) between the data wire of storage capacitor charging, and Vavg power supply is utilized to deposit in advance
Store up the data signal in next cycle, reach to shorten time and the purpose of power consumption of the write of next periodic data signals.
Those of ordinary skill in the art is it will be appreciated that embodiment described here is to aid in the reader understanding present invention's
Principle, it should be understood that protection scope of the present invention is not limited to such special statement and embodiment.This area common
It is various specifically that technical staff can make various other without departing from essence of the present invention according to these technology disclosed by the invention enlightenment
Deformation and combination, these deformation and combination are the most within the scope of the present invention.
Claims (2)
1. apply the image element driving method of AMOLED pixel-driving circuit, represent the n-th of AMOLED by positive integer n
The individual frame period；Described AMOLED pixel-driving circuit includes the storage capacitor of pixel cell, converts digital signals into number
According to the D/A conversion unit of voltage Vdata, connect D/A conversion unit and the data wire of storage capacitor and be connected to digital-to-analogue
For the Vavg power supply of precharge between converting unit and data wire；The output voltage Vavg of described Vavg power supply is pixel count
Half according to the sum of peak value up and down of voltage Vdata；The Main Function of described Vavg power supply is to store in advance under this pixel cell
The data voltage in one cycle；
It is characterized in that, including step: within the n-th scan period of AMOLED pixel cell, complete this pixel cell n-th
Periodic data signals write and Vavg power supply the (n+1)th periodic signal write；The output voltage Vavg of described Vavg power supply is
The half of the data voltage Vdata upper and lower peak value sum of n time.
Image element driving method the most according to claim 1, it is characterised in that described AMOLED pixel-driving circuit
Also include the switch control unit of charge and discharge process for controlling Vavg power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310705602.2A CN103700343B (en) | 2013-12-20 | 2013-12-20 | AMOLED pixel-driving circuit and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310705602.2A CN103700343B (en) | 2013-12-20 | 2013-12-20 | AMOLED pixel-driving circuit and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103700343A CN103700343A (en) | 2014-04-02 |
| CN103700343B true 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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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106057129B (en) * | 2016-08-24 | 2018-07-20 | 中国科学院上海高等研究院 | A kind of AMOLED display driver circuits and its driving method |
| 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 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4400403B2 (en) * | 2004-10-06 | 2010-01-20 | セイコーエプソン株式会社 | Power supply circuit, display driver, electro-optical device, and electronic device |
-
2013
- 2013-12-20 CN CN201310705602.2A patent/CN103700343B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| CN103700343A (en) | 2014-04-02 |
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Granted publication date: 20170104 Termination date: 20201220 |