CN104252834B - The low gamma characteristic compensation drive circuits of AMOLED - Google Patents
The low gamma characteristic compensation drive circuits of AMOLED Download PDFInfo
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- CN104252834B CN104252834B CN201410226197.0A CN201410226197A CN104252834B CN 104252834 B CN104252834 B CN 104252834B CN 201410226197 A CN201410226197 A CN 201410226197A CN 104252834 B CN104252834 B CN 104252834B
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- 229920001621 AMOLED Polymers 0.000 title claims abstract description 43
- 238000012937 correction Methods 0.000 claims description 23
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 4
- 241001269238 Data Species 0.000 description 3
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- 230000005540 biological transmission Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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- 239000004973 liquid crystal related substance Substances 0.000 description 1
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Abstract
The low gamma characteristic compensation drive circuits of AMOLED of the present invention, the low gamma characteristic compensation drive circuit is also input into select unit and DAC output select units including multiple DAC, DAC, and the DAC is parallel between DAC input select units and DAC output select units；DAC is input into select unit and is connected with the outfan for driving IC, DAC output select units connection voltage output end；DAC is input into select unit for selecting connection DAC to be connected with the outfan for driving IC according to driving data, and DAC output select units are connected with voltage output end for the DAC that work at present is selected according to driving data.Beneficial effect is and existing brightness curve of output that perfect a sequence of brightness improving that can be linear is interval, using the data value of the big GTG of the data value with the GTG for starting lower than image quality.
Description
Technical field
The invention belongs to technical field of AMOLED display, is related to the low gray value display defect compensation of existing AMOLED devices
Technology, the low gamma characteristic compensation drive circuit of more particularly to a kind of AMOLED.
Background technology
Organic Light Emitting Diode (OLED) display is so which is frivolous, actively luminous, fast-response speed, wide viewing angle, color are rich
The many merits such as richness, high brightness, low-power consumption and high-low temperature resistant and be known as being after liquid crystal display (LCD) by industry
Third generation Display Technique, has been increasingly used in the portable products such as smart mobile phone, digital camera, panel computer at present
In, with boundless market prospect.
Existing AMOLED drive systems substantially composition and working principle is as follows：As shown in figure 1, being produced by driving IC first
The driving data of m positions (m-bit), in driving data input DAC (digital to analog converter) of m positions, then becomes the data value with input
The driving voltage output for matching.The driving voltage of output completes to drive in being delivered to the data wire of AMOLED.AMOLED has
GTG is particularly brightness output characteristics.It is appropriate to adjust brightness output characteristics, just can be bent with the brightness curve of output and gamma wanted
Line matches.But according to the characteristic and panel characteristics of OLED material, low gray scale interval cannot generally be lit, so as to cause picture
The low problem of matter.The difference of type, output voltage is driven to be slightly different according to AMOLED, (a), (b) are respectively and are directed in such as Fig. 1
The output voltage of the driving AMOLED of nMOS and the relation of driving data and the output voltage for the driving AMOLED of pMOS with
The relation of driving data.Fig. 1 is the general driving method for driving AMOLED.If input obtains m-bit information, will be defeated
Go out and in DAC, be input into the driving voltage that the data value that obtains matches.The driving voltage of output is sent to the data wire of AMOLED
Complete to drive.Fig. 1 (a), in (b) being DAC, is input into the information for obtaining respectively according to nMOS, pMOS type AMOLED driving sides
The output voltage of formula display output.C () is the light characteristic changed with the change of output GTG in AMOLED.
If DAC inputs obtain m-bit data, n=(2 is hadm- 1) output voltage of unit.For example, if defeated
If having entered 8bit data, 256 voltages of V (0)～V (255) will be exported.When driving AMOLED, as the brightness of (c) is exported
Curve is the same, and adjustment light characteristic and gamma value complete to drive.During this as (d) interval of #1 curves, due to low
Normally can not light so as to there is a problem of that image quality is low in gray scale interval.
The content of the invention
The invention aims to solve AMOLED low problems of image quality in low gray scale interval in background technology, propose
A kind of AMOLED low gamma characteristic compensation drive circuits.
The technical scheme is that：The low gamma characteristic compensation drive circuits of AMOLED, including for generating m positions driving number
According to driving IC, the voltage output end being connected with AMOLED data wires, it is characterised in that the low gamma characteristic compensation drives
Circuit is also input into select unit and DAC output select units including multiple DAC, DAC, and the DAC is parallel to DAC inputs and selects single
Between unit and DAC output select units；DAC is input into select unit and is connected with the outfan for driving IC, DAC output select units
Connection voltage output end；DAC is input into select unit for selecting connection DAC to be connected with the outfan for driving IC according to driving data
Connect, DAC output select units are connected with voltage output end for the DAC that work at present is selected according to driving data.
Further, the DAC is respectively used to the driving data for changing different intervals.
Further, the low gamma characteristic compensation drive circuits of AMOLED include two DAC, are respectively used to change high gray area
Between driving data and low gray scale interval driving data, the driving data of high and low gray scale interval is for changing high gray area
Between driving data DAC can light AMOLED pixels driving data value be separation.
Beneficial effects of the present invention：The AMOLED low gamma characteristic compensation drive circuit uses of the present invention can switch brightness
The data selector for improving the data value of interval and input and output voltage and low gray-level correction that existing DAC can be switched
The voltage selector of the output voltage exported in DAC.Have the advantages that：1st, and existing brightness curve of output, can
Linear perfect a sequence of brightness improving is interval, using the number of the big GTG of the data value with the GTG for starting lower than image quality
According to value；2nd, the gray scale output characteristics to image quality improving interval (0-G (y)) has a linear characteristic, and with image quality improving after
Interval gray scale output characteristic curve is connected；3rd, to brightness improving interval (0-G (y)), using can be defeated in a linear fashion
Go out the low gray-level correction DAC of brightness；4th, multiple low gray-level correction DAC can be used, and coordinates the low gray-level correction for being used
The number of DAC, can adjust low gray scale interval.7th, RED, the m-bit output datas of GREEN, BLUE can independently be used.
Description of the drawings
Fig. 1 is existing AMOLED drive systems and the photovoltaic conversion characteristic curve according to different drive circuits；
Fig. 2 is the voltage output characteristics of the system for contrasting prior art and the present invention；
Fig. 3 is the AMOLED drive system principal diagrams of a specific embodiment of the present invention；
Fig. 4 is the AMOLED drive system principal diagrams of the another specific embodiment of the present invention；
Output voltage schematic diagrams of the Fig. 5 for drive system shown in Fig. 4.
Specific embodiment
Embodiments of the invention are principle of the invention and design, below in conjunction with the accompanying drawings with specific embodiment to this
Invention is further elaborated.
Embodiment 1：
As shown in figure 4, the low gamma characteristic compensation drive circuits of the AMOLED of the present embodiment, including for generating the driving of m positions
The driving IC of data, the voltage output end being connected with AMOLED data wires, the low gamma characteristic compensation drive circuit are also wrapped
Multiple DAC, DAC input select units and DAC output select units are included, the DAC is parallel to DAC input select units and DAC
Between output select unit；DAC is input into select unit and is connected with the outfan for driving IC, DAC output select units connection electricity
Pressure outfan；DAC is input into select unit for selecting connection DAC to be connected with the outfan for driving IC according to driving data, DAC
Output select unit is connected with voltage output end for the DAC that work at present is selected according to driving data.Wherein DAC is used respectively
In the different interval driving datas of conversion.
Embodiment 2：
As shown in figure 3, the low gamma characteristic compensation drive circuits of the AMOLED of the present embodiment include two DAC, it is respectively used to
Change the driving data of the driving data and low gray scale interval of high gray scale interval, the driving data of high and low gray scale interval for
The DAC for changing high gray scale interval driving data can light the driving data value of AMOLED pixels into separation.In low gray area
Between in, with the addition of to carry out the low gray-level correction DAC (Low Gray correction DAC) of gamma correction.
By solving AMOLED low problems of image quality in low gray scale interval using such scheme.Such as (d) area of Fig. 2
Between, due to being lit under low gray scale condition and low GTG G (x) for occurring of caused image quality and m- corresponding with G (x)
Bit data values x can be obtained by actual measurement.As Fig. 2 (e), from 0-G (y) it is interval till, it is as shown in #2 curve charts, bright
While degree output characteristics is exported in linear form, start to provide output as the brightness of existing #1 curves from G (y+1) intervals.
The overall output characteristic of observation Fig. 2, improves the interval brightness output characteristics of 0- (e), occurs in (d) interval low ash
Cannot light when spending so as to cause the problem of the low phenomenon of image quality to be addressed.
Low gray-level correction DAC (Low Gray correction DAC) is that brightness can in low gray scale interval 0-G (y)
The DAC for exporting in linear form.Export low gray scale interval 0-G (y) to match V (0)～V (y) interval driving including data value y
Voltage, and be delivered in the data wire of AMOLED.From the beginning of data values y+1, V (the y+1)～V's (n) exported in existing DAC
Driving voltage is delivered in the data wire of AMOLED.Low gray-level correction DAC (Low Gray correction DAC) with it is existing
The selection and transmission of the driving voltage of DAC can be by switching D (y), and V (y) selector are selected, its breaker in middle D (y), V
Y () selector is DAC input select units and DAC output select units.
Normal voltage V (y) of the low gray-level correction DAC (Low Gray correction DAC) adopted in the present embodiment
With other voltages are not needed, only using the advantage of the driving voltage exported in existing DAC.
From the point of view of overall flow, if having input m-bit data, by D (y) selectores, in low gray scale, with linear
Data value G (y) corresponding to the G (y) of brightness output characteristics is interval is transferred to low gray-level correction DAC.D0～D that transmission is obtained
While the data voltage of data output V0 of (y)～V (n), by V (y) selectores, it is transferred in the data wire of AMOLED.G
Behind (y) interval, start data transfer to D (n) into existing DAC from D (y+1), start to V (n) from V (y+1) be
Driving voltage only is transferred in AMOLED data wires.So, with the brightness curve of output of Fig. 2, improving ground gray scale interval
While liaison is exported, can also solve the problems, such as that image quality is low.
If luminance compensation need not be carried out in low gray scale interval, existing DAC is only used, can be used from the beginning of V (0)
Output voltage to V (n), with the advantage that flexibly can be used.Therefore, in order to the display for increasing AMOLED may be selected
Property, can select in actual applications to retain existing DAC, existing DAC is in parallel with the DAC used in the present invention.
Fig. 4 is the driving method using 3 low gray-level correction DAC.When Fig. 5 is 3 low gray-level correction DAC that Fig. 4 is used,
The enlarged drawing of low gray portion brightness output characteristic curve.Can improve many using the mode of this multiple low gray-level correction DAC
The low problem of image quality in individual interval.
The low gamma characteristic compensation drive circuits of AMOLED of the present embodiment, being capable of line compared with existing brightness curve of output
Property perfect a sequence of brightness improving it is interval, using the data of the big GTG of the data value with the GTG for starting lower than image quality
Value.Gray scale output characteristics to image quality improving interval (0-G (y)) has a linear characteristic, and with image quality improving after interval
Gray scale output characteristic curve be connected.To brightness improving interval (0-G (y)), using brightness can be exported in a linear fashion
Low gray-level correction DAC.Can use multiple low gray-level correction DAC, and coordinate the low gray-level correction DAC for being used
Number, can adjust low gray scale interval, and can use RED, the m-bit output datas of GREEN, BLUE.
One of ordinary skill in the art will be appreciated that embodiment described here is to aid in reader and understands this
Bright principle, it should be understood that protection scope of the present invention is not limited to such especially statement and embodiment.This area
It is each that those of ordinary skill can make various other without departing from essence of the invention according to these technologies enlightenment disclosed by the invention
Plant concrete deformation and combine, these deformations and combination are still within the scope of the present invention.
Claims (2)
- The low gamma characteristic compensation drive circuits of 1.AMOLED, including for generating the driving IC of m positions driving data, with AMOLED numbers The voltage output end being connected according to line, it is characterised in that the low gamma characteristic compensation drive circuit also includes multiple DAC, DAC Input select unit and DAC output select units, the DAC be parallel to DAC input select units and DAC output select units it Between；DAC is input into select unit and is connected with the outfan for driving IC, DAC output select units connection voltage output end；DAC is defeated Enter select unit for selecting connection DAC to be connected with the outfan for driving IC according to driving data, DAC output select units are used It is connected with voltage output end in the DAC of work at present is selected according to driving data；The low gamma characteristic compensation drive circuits of AMOLED include two DAC, are respectively used to change the driving data of high gray scale interval With the driving data of low gray scale interval, the driving data of high and low gray scale interval is for the high gray scale interval driving data of conversion It is separation that DAC can light the driving data value of AMOLED pixels；In low gray scale interval, with the addition of to carry out the low gray-level correction DAC of gamma correction, and low gray-level correction DAC is low In gray scale interval, the DAC that brightness can be exported in linear form.
- 2. low gamma characteristic compensation drive circuits of AMOLED according to claim 1, it is characterised in that the DAC difference For changing the driving data in different intervals.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410226197.0A CN104252834B (en) | 2014-05-27 | 2014-05-27 | The low gamma characteristic compensation drive circuits of AMOLED |
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| CN201410226197.0A CN104252834B (en) | 2014-05-27 | 2014-05-27 | The low gamma characteristic compensation drive circuits of AMOLED |
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| CN104252834A CN104252834A (en) | 2014-12-31 |
| CN104252834B true CN104252834B (en) | 2017-03-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106782307B (en) * | 2017-01-25 | 2019-07-05 | 上海天马有机发光显示技术有限公司 | A kind of gray level compensation method and gray scale compensation system of OLED display panel |
| CN107424572A (en) * | 2017-06-12 | 2017-12-01 | 青岛海信电器股份有限公司 | A kind of display drive method, device and display |
| CN107492348B (en) * | 2017-09-20 | 2020-03-10 | 深圳市华星光电半导体显示技术有限公司 | Method for improving display effect of display panel and display panel |
| CN110033735B (en) * | 2019-04-25 | 2021-01-26 | 京东方科技集团股份有限公司 | Drive IC, OLED display panel and display device |
| CN111862887A (en) * | 2020-08-13 | 2020-10-30 | 深圳市奥拓电子股份有限公司 | Correction data control method and device for self-adaptive gray scale and LED display screen |
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| JP3637911B2 (en) * | 2002-04-24 | 2005-04-13 | セイコーエプソン株式会社 | Electronic device, electronic apparatus, and driving method of electronic device |
| JP2005157203A (en) * | 2003-11-28 | 2005-06-16 | Tohoku Pioneer Corp | Driving device and method of light emitting display panel |
| KR20080012419A (en) * | 2006-08-03 | 2008-02-12 | 삼성전자주식회사 | Source driving chip and display device having same |
| CA2637343A1 (en) * | 2008-07-29 | 2010-01-29 | Ignis Innovation Inc. | Improving the display source driver |
| CN103177422A (en) * | 2011-12-20 | 2013-06-26 | 富士通株式会社 | Backlight compensation method and system |
| CN103617780B (en) * | 2013-12-06 | 2016-05-04 | 北京航空航天大学 | AMOLED display drive circuit and non-linear interpolation building method |
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