CN104252834A - AMOLED (Active Matrix/Organic Light Emitting Diode) low-gray characteristic compensation driving circuit - Google Patents
AMOLED (Active Matrix/Organic Light Emitting Diode) low-gray characteristic compensation driving circuit Download PDFInfo
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- CN104252834A CN104252834A CN201410226197.0A CN201410226197A CN104252834A CN 104252834 A CN104252834 A CN 104252834A CN 201410226197 A CN201410226197 A CN 201410226197A CN 104252834 A CN104252834 A CN 104252834A
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Abstract
The invention relates to an AMOLED (Active Matrix/Organic Light Emitting Diode) low-gray characteristic compensation driving circuit. The low-gray characteristic compensation driving circuit comprises a plurality of DACs (Digital-to-Analog Converters), a DAC input selection unit and a DAC output selection unit, wherein the DACs are connected in parallel between the DAC input selection unit and the DAC output selection unit; the DAC input selection unit is connected with an output end of a driving IC (Integrated Circuit) and the DAC output selection unit is connected with a voltage output end; the DAC input selection unit is used for selecting a DAC to be connected with the output end of the driving IC according to driving data, and the DAC output selection unit is used for selecting the current working DAC to be connected with the voltage output end according to the driving data. The AMOLED low-gray characteristic compensation driving circuit has the beneficial effects that compared with the existing brightness output curve, the connected brightness improvement range can be linearly perfected and data values of gray scales which are larger than the data valve of a gray scale which is started from a low image quality level can be used.
Description
Technical field
The invention belongs to technical field of AMOLED display, relate to the low gray-scale value display defect compensation technique of existing AMOLED device, particularly the low gamma characteristic compensation drive circuit of a kind of AMOLED.
Background technology
Organic Light Emitting Diode (OLED) display is frivolous with it, active illuminating, fast-response speed, wide viewing angle, rich color, high brightness, the many merits such as low-power consumption and high-low temperature resistant and to be known as by industry be third generation display technique after liquid crystal display (LCD), be applied in more and more in the portable products such as smart mobile phone, digital camera, panel computer at present, there are boundless market outlook.
Roughly composition and working principle is as follows for existing AMOLED drive system: as shown in Figure 1, first the driving data of m position (m-bit) is produced by drive IC, in driving data input DAC (digital to analog converter) of m position, then become the driving voltage matched with the data value of input and export.The driving voltage exported is delivered in the data line of AMOLED and completes driving.AMOLED has GTG particularly brightness output characteristics.Suitable adjustment brightness output characteristics, just can match with the brightness curve of output wanted and gamma curve.But the characteristic of foundation OLED material and panel characteristics, usually cannot be lit between low gray area, thus cause the low problem of image quality.The difference of type is driven according to AMOLED, output voltage is slightly different, as (a) in Fig. 1, (b) are respectively for the output voltage of the driving AMOLED of nMOS and the relation of driving data with for the output voltage of the driving AMOLED of pMOS and the relation of driving data.Fig. 1 is the general driving method for driving AMOLED.If input obtains m-bit information, will export with DAC in input the driving voltage that the data value that obtains matches.The data line that the driving voltage exported is sent to AMOLED completes driving.Fig. 1 (a), (b) is in DAC, and the information that input obtains is respectively according to the output voltage of nMOS, pMOS type AMOLED type of drive display translation.C () is the light characteristic changed along with the change of output GTG in AMOLED.
If DAC input obtains m-bit data, then have n=(2
m-1) output voltage of unit.For example, if having input 8bit data, 256 voltages of V (0) ~ V (255) will be exported.When driving AMOLED, as the brightness curve of output of (c), adjustment light characteristic and gamma value complete driving.In this process as (d) of #1 curve is interval, owing to normally can not lighting between low gray area thus there is the low problem of image quality.
Summary of the invention
The object of the invention is, in order to solve AMOLED middle low problem of image quality between low gray area in background technology, to propose the low gamma characteristic compensation drive circuit of a kind of AMOLED.
Technical scheme of the present invention is: the low gamma characteristic compensation drive circuit of AMOLED, comprise the drive IC for generating m position driving data, the voltage output end be connected with AMOLED data line, it is characterized in that, described low gamma characteristic compensation drive circuit also comprises multiple DAC, DAC input selection unit and DAC output select unit, and described DAC is parallel between DAC input selection unit and DAC output select unit; DAC input selection unit is connected with the output terminal of drive IC, and DAC output select unit connects voltage output end; DAC input selection unit is used for selecting to connect DAC according to driving data and is connected with the output terminal of drive IC, and DAC output select unit is used for selecting the DAC of work at present to be connected with voltage output end according to driving data.
Further, described DAC is respectively used to change different interval driving data.
Further, the low gamma characteristic compensation drive circuit of AMOLED comprises two DAC, be respectively used to change the driving data between high gray area and the driving data between low gray area, the driving data value that the driving data between high and low gray area can light AMOLED pixel for the DAC changing driving data between high gray area is separation.
Beneficial effect of the present invention: AMOLED of the present invention low gamma characteristic compensation drive circuit uses can the data selector of data value of the interval and input of switch brightness improving and the voltage selector of output voltage that can export in the output voltage of the existing DAC of switch and low grey level compensation DAC.Have following beneficial effect: 1, with existing brightness curve of output, perfection that can be linear brightness improving is in succession interval, the data value of the GTG using the data value with the GTG that start lower in image quality large; 2, the gray scale output characteristics to image quality improving interval (0-G (y)) has linear characteristic, and is connected with the gray scale output characteristic curve in the interval after image quality improving; 3, to brightness improving interval (0-G (y)), using can the low grey level compensation DAC of output brightness in a linear fashion; 4, multiple low grey level compensation DAC can be used, and coordinates the number of the low grey level compensation DAC used, can adjust between low gray area.7, independently can use RED, the m-bit of GREEN, BLUE exports data.
Accompanying drawing explanation
Fig. 1 is existing AMOLED drive system and the photovoltaic conversion family curve according to different driving circuits;
Fig. 2 is the voltage output characteristics of contrast prior art and system of the present invention;
Fig. 3 is the AMOLED drive system principal diagram of a specific embodiment of the present invention;
Fig. 4 is the AMOLED drive system principal diagram of another specific embodiment of the present invention;
The output voltage schematic diagram that Fig. 5 is drive system shown in Fig. 4.
Embodiment
Embodiments of the invention design according to principle of the present invention, and below in conjunction with accompanying drawing and specific embodiment, the invention will be further elaborated.
Embodiment 1:
As shown in Figure 4, the low gamma characteristic compensation drive circuit of AMOLED of the present embodiment, comprise the drive IC for generating m position driving data, the voltage output end be connected with AMOLED data line, described low gamma characteristic compensation drive circuit also comprises multiple DAC, DAC input selection unit and DAC output select unit, and described DAC is parallel between DAC input selection unit and DAC output select unit; DAC input selection unit is connected with the output terminal of drive IC, and DAC output select unit connects voltage output end; DAC input selection unit is used for selecting to connect DAC according to driving data and is connected with the output terminal of drive IC, and DAC output select unit is used for selecting the DAC of work at present to be connected with voltage output end according to driving data.Wherein DAC is respectively used to change different interval driving data.
Embodiment 2:
As shown in Figure 3, the low gamma characteristic compensation drive circuit of AMOLED of the present embodiment comprises two DAC, be respectively used to change the driving data between high gray area and the driving data between low gray area, the driving data value that the driving data between high and low gray area can light AMOLED pixel for the DAC changing driving data between high gray area is separation.In between low gray area, with the addition of the low gray correction DAC (Low Gray correction DAC) that can carry out gamma correction.
AMOLED middle low problem of image quality between low gray area is solved by adopting such scheme.(d) as Fig. 2 is interval, and GTG G (x) that the image quality caused owing to can not be lit under low gray scale condition lowly occurs and the m-bit data value x corresponding with G (x) can be obtained by actual measurement.As (e) of Fig. 2, till 0-G (y) interval, as shown in #2 curve map, while brightness output characteristics exports in linear form, from G (y+1) interval, provide the brightness exported as existing #1 curve.
Observe the overall output characteristics of Fig. 2, improve the brightness output characteristics that 0-(e) is interval, cannot light thus cause the problem of the low phenomenon of image quality to be solved when occurring in the low gray scale in (d) interval.
Low grey level compensation DAC (Low Gray correction DAC) is between low gray area in 0-G (y), the DAC that brightness can export in linear form.Export 0-G (y) between low gray area to comprise data value y and to match the interval driving voltage of V (0) ~ V (y), and be delivered in the data line of AMOLED.From data value y+1, the driving voltage of V (the y+1) ~ V (n) exported in existing DAC is delivered in the data line of AMOLED.The selection of the driving voltage of low grey level compensation DAC (Low Gray correction DAC) and existing DAC and transmit and can pass through switch D (y), V (y) selector selects, its breaker in middle D (y), V (y) selector is DAC input selection unit and DAC output select unit.
The normal voltage V (y) of the low grey level compensation DAC (Low Gray correction DAC) adopted in the present embodiment has does not need other voltage, only uses the advantage of the driving voltage exported in existing DAC.
From overall flow, if having input m-bit data, by D (y) selector switch, in low gray scale, data value G (y) corresponding to G (y) interval with linear luminance output characteristics is passed to low grey level compensation DAC.While transmitting the data voltage of data output V0 ~ V (n) of the D0 ~ D (y) obtained, by V (y) selector switch, be passed in the data line of AMOLED.Behind G (y) interval, the data from D (y+1) to D (n) are passed in existing DAC, and the driving voltage from V (y+1) to V (n) is passed in AMOLED data line.Like this, with the brightness curve of output of Fig. 2, while improving the liaison output between gray area, ground, the low problem of image quality also can be solved.
If do not need to carry out luminance compensation between low gray area, only use existing DAC, the output voltage to V (n) from V (0) can be used, there is the advantage that can use flexibly.Therefore, in order to the display increasing AMOLED is alternative, can select in actual applications to retain existing DAC, existing DAC is in parallel with the DAC used in the present invention, and input selection unit can manual switch connected mode be connected as existing DAC with output select unit.
Fig. 4 is the driving method of the low grey level compensation DAC of use 3.Fig. 5 be Fig. 4 use 3 low grey level compensation DAC time, the enlarged drawing of low gray portion brightness output characteristic curve.Use the mode of this multiple low grey level compensation DAC can improve the low problem of image quality in multiple interval.
The AMOLED low gamma characteristic compensation drive circuit of the present embodiment is compared with existing brightness curve of output, and perfection that can be linear brightness improving is in succession interval, the data value of the GTG using the data value with the GTG that start lower in image quality large.Gray scale output characteristics to image quality improving interval (0-G (y)) has linear characteristic, and is connected with the gray scale output characteristic curve in the interval after image quality improving.To brightness improving interval (0-G (y)), using can the low grey level compensation DAC of output brightness in a linear fashion.Can use multiple low grey level compensation DAC, and coordinate the number of the low grey level compensation DAC used, can adjust between low gray area, and can use RED, the m-bit of GREEN, BLUE exports data.
Those of ordinary skill in the art will appreciate that, embodiment described here is 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 so special statement and embodiment.Those of ordinary skill in the art can make various other various concrete distortion and combination of not departing from essence of the present invention according to these technology enlightenment disclosed by the invention, and these distortion and combination are still in protection scope of the present invention.
Claims (3)
- The low gamma characteristic compensation drive circuit of 1.AMOLED, comprise the drive IC for generating m position driving data, the voltage output end be connected with AMOLED data line, it is characterized in that, described low gamma characteristic compensation drive circuit also comprises multiple DAC, DAC input selection unit and DAC output select unit, and described DAC is parallel between DAC input selection unit and DAC output select unit; DAC input selection unit is connected with the output terminal of drive IC, and DAC output select unit connects voltage output end; DAC input selection unit is used for selecting to connect DAC according to driving data and is connected with the output terminal of drive IC, and DAC output select unit is used for selecting the DAC of work at present to be connected with voltage output end according to driving data.
- 2. the low gamma characteristic compensation drive circuit of AMOLED according to claim 1, is characterized in that, described DAC is respectively used to change different interval driving data.
- 3. the low gamma characteristic compensation drive circuit of AMOLED according to claim 1, it is characterized in that, the low gamma characteristic compensation drive circuit of AMOLED comprises two DAC, be respectively used to change the driving data between high gray area and the driving data between low gray area, the driving data value that the driving data between high and low gray area can light AMOLED pixel for the DAC changing driving data between high gray area is separation.
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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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| CN106782307A (en) * | 2017-01-25 | 2017-05-31 | 上海天马有机发光显示技术有限公司 | The gray level compensation method and gray scale compensation system of a kind 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 |
| CN107492348A (en) * | 2017-09-20 | 2017-12-19 | 深圳市华星光电半导体显示技术有限公司 | Improve the method and display panel of display panel display effect |
| CN110033735A (en) * | 2019-04-25 | 2019-07-19 | 京东方科技集团股份有限公司 | A kind of driving 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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| 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 |
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| 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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| CN104252834B (en) | 2017-03-29 |
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Granted publication date: 20170329 Termination date: 20210527 |