CN100395806C - Drive controlling circuit of active matrix organic light emitting diodes and adjusting white balancing method - Google Patents
Drive controlling circuit of active matrix organic light emitting diodes and adjusting white balancing method Download PDFInfo
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Abstract
The present invention relates to a drive control circuit and a regulating method for dynamically regulating the white balance for an active array organic light emitting diode. A programmable voltage generator is used for supplying a plurality of programmable voltage sources which are respectively used as a red pixel power supply, a green pixel power supply and a blue pixel power supply of a display panel of the active array organic light emitting diode. A white balance regulating circuit is used for dynamically regulating the voltage value of the programmable voltage source according to the use condition, namely the consumption condition of materials, of the display panel of the active array organic light emitting diode, and the purpose of the regulation of the white balance of the display panel of the active array organic light emitting diode is realized.
Description
Technical field
The invention relates to a kind of active-matrix Organic Light Emitting Diode (Active Matrix OrganicLight Emitting Diode, be called for short AMOLED) Drive and Control Circuit, and particularly relevant for a kind of active-matrix Organic Light Emitting Diode Drive and Control Circuit and the method for adjustment that can dynamically adjust white balance.
Background technology
Along with the prosperity of Information technology, of all kinds as information equipments such as computer, mobile phone, personal digital assistant (PDA) and digital cameras, all constantly weed out the old and bring forth the new.In these information equipments, display is being played the part of critical role all the time, and flat-panel screens (Flat Panel Display) is little by little to receive an acclaim owing to have slim, the light characteristic that reaches power saving of amount.
In various flat-panel screens, the visual angle is wide, color contrast is effective because of having, response speed reaches low cost and other advantages soon for the active-matrix organic light emitting diode display, so be very suitable for the application as small-size displays such as electronic clock, mobile phone, personal digital assistant and digital cameras.
Yet because the Organic Light Emitting Diode that the active-matrix organic LED display panel uses, the material behavior of its red (R), green (G), blue (B) three looks also inequality, therefore, after having long-time operation, make luminosity inconsistent, cause the not good situation of white balance.Please referring to shown in Figure 1, its (a) and (b), (c) are respectively red, green, blue three look high-molecular luminous material brightness-life characteristic figure, and among the figure, the curve of paler colour is the brightness attenuation curve of red, green, blue three look high-molecular luminous materials.Significantly, the brightness attenuation characteristic of red, green, blue three look high-molecular luminous materials is also inequality, so after the active-matrix organic LED display panel was through long operation, it was inconsistent to have luminosity, causes the not good problem of white balance.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of active-matrix Organic Light Emitting Diode Drive and Control Circuit and the method for adjustment that can dynamically adjust white balance, it can dynamically adjust white balance along with the brightness attenuation situation of active-matrix organic LED display panel.
For reaching above-mentioned and other purpose, the invention provides a kind of active-matrix Organic Light Emitting Diode Drive and Control Circuit that can dynamically adjust white balance, applicable to driving an active-matrix organic LED display panel.This active-matrix Organic Light Emitting Diode Drive and Control Circuit that can dynamically adjust white balance comprises: gate driver circuit, source electrode drive circuit, programmable voltage generator and sequential control circuit.Wherein, gate driver circuit is in order to producing a horizontal time-base, with the demonstration of the sweep trace of control active-matrix organic LED display panel.Source electrode drive circuit is in order to cooperate horizontal time-base, and the video data that will desire scan lines displayed is urged to the active-matrix organic LED display panel.The a plurality of programmable voltage sources of programmable voltage generator for generating are with respectively as the power supply of the red, green, blue pixel of active-matrix organic LED display panel.Sequential control circuit then couples gate driver circuit, source electrode drive circuit and programmable voltage generator, drive the sequential of video data in order to control gate driver circuit and source electrode drive circuit, this sequential control circuit is according to the brightness attenuation situation of active-matrix organic LED display panel, dynamically adjust the magnitude of voltage of programmable voltage source, and then realize the purpose of the white balance of adjustment active-matrix organic LED display panel.
In one embodiment, its sequential control circuit comprises: source electrode and grid time series data control circuit, interface treatment circuit and wwhite balance control circuit.Wherein, source electrode and grid time series data control circuit drive the sequential of video data in order to control gate driver circuit and source electrode drive circuit.The interface of interface treatment circuit in order to transmit as signal, wwhite balance control circuit then couples source electrode and grid time series data control circuit and interface treatment circuit, in order to brightness attenuation situation according to the active-matrix organic LED display panel, to adjust the adjustment parameter of the magnitude of voltage of programmable voltage source, transmit by the interface treatment circuit.
In one embodiment, the use situation of active-matrix organic LED display panel, count it in a setting-up time, it for example is the number of 255 data setting value that the demonstration GTG of video data is not less than, with the attenuation situation of detecting material, and the adjustment parameter of the magnitude of voltage of programmable voltage source is adjusted in generation according to this.Therefore, its wwhite balance control circuit comprises at least: first comparer, counter, second comparer, and arithmetic logic and parameter setting unit.
Wherein, first comparer produces first comparison signal in order to video data and data setting value are made comparisons, and the demonstration GTG of the video data of first comparison signal representative input is not less than the signal of data setting value.Counter couples first comparer, in order to according to first comparison signal, counts a count value of counter, and its method of counting for example is that count value is added one.Second comparer couples counter, in order to the count value of counter and a counting setting value are made comparisons, produces second comparison signal, and just the demonstration GTG of the video data number that is not less than the data setting value has reached the signal of counting setting value.Reach arithmetic logic and couple second comparer,,, produce one and adjust signal according to second comparison signal in order to when a setting-up time arrives.The parameter setting unit then couples and arithmetic logic, in order to according to adjusting signal, sets the adjustment parameter of the magnitude of voltage that can adjust programmable voltage source, and transmits by aforesaid interface treatment circuit.
It for example is in ROM (read-only memory), electronics EPROM or the flash memory that aforementioned data setting value, counting setting value and setting-up time can be stored in, and it for example is the tandem transmission interface of IIC that the aforementioned interface treatment circuit then can provide.
The present invention provides a kind of white balance adjustment method of active-matrix Organic Light Emitting Diode Drive and Control Circuit in addition, applicable to the white balance of dynamically adjusting an active-matrix organic LED display panel.The method comprises the following steps: to provide a plurality of programmable voltage sources, with respectively as the power supply of the red, green, blue pixel of active-matrix organic LED display panel; And, dynamically adjust the magnitude of voltage of programmable voltage source according to the brightness attenuation situation of active-matrix organic LED display panel.
Wherein, according to the brightness attenuation situation of active-matrix organic LED display panel, the step of dynamically adjusting programmable voltage source can comprise: receive a video data; A video data and a data setting value are made comparisons; When video data is not less than the data setting value, just the demonstration GTG of video data is not less than when for example being 255 data setting value, carry one count value; A count value and the counting setting value counted are made comparisons; And the count value that arrives and count when a setting-up time is not less than the counting setting value, when just the attenuation of detecting material reaches the degree of setting, adjust the magnitude of voltage of programmable voltage source, so that the preferable white balance of active-matrix organic LED display panel to be provided.
By in the above-mentioned explanation as can be known, use a kind of active-matrix Organic Light Emitting Diode Drive and Control Circuit and the method for adjustment that can dynamically adjust white balance provided by the present invention, then can be along with the attenuation situation of active-matrix organic LED display panel because of it, dynamically adjust white balance, so the preferable white balance of active-matrix organic LED display panel can be provided.
For above-mentioned and other purposes of the present invention, feature and advantage can be become apparent, hereinafter special with preferred embodiment, and cooperate appended graphicly, be described in detail below:
Description of drawings
Fig. 1 (a) and (b), (c) show the brightness-life characteristic figure of red, green, blue three look high-molecular luminous materials respectively.
Fig. 2 shows a kind of active-matrix organic light-emitting diode pixel circuit figure.
Characteristics of transistor curve map in Fig. 3 displayed map 2.
Fig. 4 shows a kind of active-matrix Organic Light Emitting Diode Drive and Control Circuit synoptic diagram that can dynamically adjust white balance of the preferred embodiment according to the present invention.
Fig. 5 shows a kind of sequential control circuit block schematic diagram of the preferred embodiment according to the present invention.
Fig. 6 shows the synoptic diagram of the display panel of resolution 1024*768 being divided into 16 zones.
Fig. 7 shows a kind of wwhite balance control circuit synoptic diagram of the preferred embodiment according to the present invention.
Fig. 8 shows the white balance adjustment method schematic flow sheet of a kind of active-matrix Organic Light Emitting Diode Drive and Control Circuit of preferred embodiment according to the present invention.
Embodiment
Figure 2 shows that a kind of active-matrix organic light-emitting diode pixel circuit figure.Show among the figure that this active-matrix Organic Light Emitting Diode (Active Matrix Organic Light Emitting Diode is called for short AMOLED) pixel comprises: transistor 210, transistor 220, electric capacity 230 and Organic Light Emitting Diode 240.Wherein, the grid of transistor 210 connects sweep trace, drain electrode connects data line, an end of source electrode connection electric capacity 230 and the grid of transistor 220, the anode tap that the drain electrode connection power supply Vdd of transistor 220, source electrode are connected with OLED 240.
Its mode of operation is, when a horizontal time-base that receives when sweep trace scans so far pixel, can turn-on transistor 210, and be sent to the grid of transistor 220 with voltage with data line, obtain grid voltage Vg.Generally speaking, the display brightness of Organic Light Emitting Diode 240 is directly proportional with the electric current I d of the Organic Light Emitting Diode 240 of flowing through, and therefore, can control the demonstration GTG of Organic Light Emitting Diode 240 by representing the magnitude of voltage of video data on the data line.
As preceding in Fig. 1 as described in, when the active-matrix organic LED display panel through after the long-time operation, can be because the difference of red, green, blue three look high-molecular luminous material attenuation characteristics, so that have luminosity inconsistent, cause the not good problem of white balance.Therefore, the present invention adjusts the size of the electric current I d of the Organic Light Emitting Diode 240 of flowing through by adjusting the magnitude of voltage of the power supply Vdd of pixel among Fig. 2, and then changes the actual displayed brightness of Organic Light Emitting Diode 240.The effect of this kind method of adjustment can obtain with reference to characteristics of transistor curve map among the figure 3 to confirm.
Figure 4 shows that a kind of active-matrix Organic Light Emitting Diode Drive and Control Circuit synoptic diagram that can dynamically adjust white balance of preferred embodiment according to the present invention.Show among the figure, this the active-matrix Organic Light Emitting Diode Drive and Control Circuit that can dynamically adjust white balance comprises: gate driver circuit 410, source electrode drive circuit 420, programmable voltage generator 430 and sequential control circuit 440, it is used for driving pel array R, the G that comprises figure, the active-matrix organic LED display panel 450 of B.
Wherein, gate driver circuit 410 is in order to producing a horizontal time-base, with the demonstration of the sweep trace of control active-matrix organic LED display panel 450.Source electrode drive circuit 420 is in order to cooperate horizontal time-base, and the video data that will desire scan lines displayed is urged to active-matrix organic LED display panel 450.Programmable voltage generator 430 is in order to producing a plurality of programmable voltage source Vdd_r and Vss_r, Vdd_g and Vss_g and Vdd_b and Vss_b etc., with respectively as red (R), green (G) of active-matrix organic LED display panel 450, the power supply of blue (B) pixel.Sequential control circuit 440 then couples gate driver circuit 410, source electrode drive circuit 420 and programmable voltage generator 430, drive the sequential of video data in order to control gate driver circuit 410 and source electrode drive circuit 420, and according to the use situation of active-matrix organic LED display panel 450, for example be its demonstration time and the number that shows the pixel of GTG more than certain value etc., dynamically adjust programmable voltage source Vdd_r and Vss_r, the magnitude of voltage of Vdd_g and Vss_g and Vdd_b and Vss_b etc., and then the purpose of the white balance of active-matrix organic LED display panel 450 is adjusted in realization.
Please refer to shown in Figure 5ly, be a kind of sequential control circuit block schematic diagram of preferred embodiment according to the present invention.Show among the figure that sequential control circuit 440 comprises: source electrode and grid time series data control circuit 510, interface treatment circuit 530 and wwhite balance control circuit 520.Wherein, source electrode and grid time series data control circuit 510 drive the sequential of video data in order to control gate driver circuit 410 and source electrode drive circuit 420.Interface treatment circuit 530 for example is the tandem transmission interface of IIC in order to provide, with the interface that transmits as signal.Wwhite balance control circuit 520 then couples source electrode and grid time series data control circuit 510 and interface treatment circuit 530, in order to use situation according to the active-matrix organic LED display panel, for example be its demonstration time and the number that shows the pixel of GTG more than certain value etc., to adjust the adjustment parameter of the magnitude of voltage of programmable voltage source, the interface that is provided by interface treatment circuit 530 transmits.
Please refer to shown in Figure 6ly, it is for dividing into the display panel of resolution 1024*768 the synoptic diagram in 16 zones.Explanation according to the circuit of Fig. 4 and Fig. 5, a kind of active-matrix Organic Light Emitting Diode Drive and Control Circuit that can dynamically adjust white balance of preferred embodiment according to the present invention, for example to be the demonstration time of active-matrix organic LED display panel and the number that shows the pixel of GTG more than certain value etc., adjust the magnitude of voltage of programmable voltage source.And in order to detect the driving demonstration situation of active-matrix organic LED display panel more accurately, the decline situation of its material just, so that wwhite balance control circuit 520 can be adjusted for the purpose of the magnitude of voltage of programmable voltage source more accurately, the active-matrix organic LED display panel is divided into again 16 zones herein, to count within a certain period of time respectively, each regional active-matrix Organic Light Emitting Diode bears the number that the above GTG of certain value shows, as the basis of judging its material decline situation.Certainly, as is known to the person skilled in the art, the number of the distinguishable region of active-matrix organic LED display panel can change according to different demands.
Therefore, a kind of wwhite balance control circuit synoptic diagram of preferred embodiment can be as shown in Figure 7 according to the present invention.Among the figure, wwhite balance control circuit comprises at least: first comparer 710, counter 720, second comparer 730, and arithmetic logic 740 and parameter setting unit 750.Certainly, as is known to the person skilled in the art, first comparer 710 herein, counter 720, second comparer 730, and arithmetic logic 740 etc., in a zone surveying the active-matrix organic LED display panel, a plurality of setting-up times and the situation of counting the sub-one of setting value, when for the situation of more setting-up times of surveying multizone more and counting setting value, the quantity of its comparer and counter etc. also needs synchronously increase.
Among Fig. 7, first comparer 710 is made comparisons in order to video data that desire is shown and the data setting value that for example is 255, produces the first comparison signal C1, and the demonstration GTG of the video data of first comparison signal C1 representative input is not less than the signal of data setting value.When coming comparison herein as with the data setting value of GTG 255, in the video data of 8 bytes, with the detectable display video data that goes out material attenuation maximum.
In addition, counter 720 couples first comparer 710, in order to according to the first comparison signal C1, counts a count value of counter 720, and its method of counting for example is when receiving comparison signal C1, and count value is added one.Second comparer 730 couples counter 720, in order to the count value and a counting setting value of counter 720 are made comparisons, produce the second comparison signal C2, just relatively whether the demonstration GTG of the video data number that is not less than the data setting value has reached the counting setting value.Reach arithmetic logic 740 and couple second comparer 730,,, produce one and adjust signal ADJ according to the second comparison signal C2 in order to when a setting-up time arrives.Parameter setting unit 750 then couples and arithmetic logic 740, in order to according to adjusting signal ADJ, sets the adjustment parameter of the magnitude of voltage of adjusting programmable voltage source, and is sent to programmable voltage generator 430 by the interface treatment circuit 530 of Fig. 5.
Wherein, it for example is in ROM (read-only memory) (ROM), electronics EPROM (EEPROM) or the flash memory (flash memory) that the data setting value of using, counting setting value and setting-up time etc. can be stored in, and when each startup active-matrix organic LED display panel shows, read in data as a comparison.
Please refer to shown in Figure 8ly, it is the white balance adjustment method schematic flow sheet of a kind of active-matrix Organic Light Emitting Diode Drive and Control Circuit of the preferred embodiment according to the present invention.The method is applicable to the white balance of dynamically adjusting an active-matrix organic LED display panel, it at first must provide a plurality of programmable voltage sources, with respectively as the power supply of the red, green, blue pixel of active-matrix organic LED display panel, and then, dynamically adjust the magnitude of voltage of programmable voltage source according to the use situation of active-matrix organic LED display panel.As previously mentioned, it for example is 16 zones that the active-matrix organic LED display panel of desire adjustment can be divided into, but because of the detailed method of adjustment flow process in each zone is all identical with the first area, therefore, only at length draw the flow process of first area among Fig. 8, be described as follows.
In step 810, at first receive a video data, and in step 820, judge that the video data that is received belongs to which zone of active-matrix organic LED display panel, just enters the detailed process in that zone then from outside.For example when judging that the video data that is received belongs to the first area of active-matrix organic LED display panel, then shown in step 830, with video data and for example is that the data setting value of GTG 255 is made comparisons, when video data is not less than the data setting value, enter 840 steps, with carry one count value, just video data is not less than the number of the data setting value of GTG 255, then in 850 steps, a count value and the counting setting value counted are made comparisons, and judge whether the count value of its counting has been not less than the counting setting value when a setting-up time arrives.The count value that arrives and count when setting-up time is not less than the counting setting value, when just representing the attenuation of detecting material to reach the degree of setting, enter 860 steps, adjust the magnitude of voltage of programmable voltage source, so that the preferable white balance of active-matrix organic LED display panel to be provided.Certainly, aforementioned setting-up time as a comparison and counting setting value can be adjusted on demand, and therefore, its number will be not limited to only have a setting-up time and counting setting value, and can be to use the setting-up time and counting setting value of many groups.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention; when can doing various changes and retouching, so protection scope of the present invention is as the criterion when looking accompanying the application protection domain person of defining.
Claims (9)
1. the active-matrix Organic Light Emitting Diode Drive and Control Circuit that can dynamically adjust white balance is used for driving-active-matrix organic LED display panel, comprising:
One gate driver circuit is in order to producing a horizontal time-base, with the demonstration of the sweep trace of controlling this active-matrix organic LED display panel;
The one source pole driving circuit in order to cooperating this horizontal time-base, is urged to this active-matrix organic LED display panel with a video data of sweep trace;
One programmable voltage generator is in order to producing a plurality of programmable voltage sources, with respectively as the power supply of the red, green, blue pixel of this active-matrix organic LED display panel; And
One sequential control circuit, couple this gate driver circuit, this source electrode drive circuit and this programmable voltage generator, in order to control the sequential that this gate driver circuit and this source electrode drive circuit drive this video data, this sequential control circuit is dynamically adjusted the magnitude of voltage of those programmable voltage sources according to the brightness attenuation situation of this active-matrix organic LED display panel.
2. the active-matrix Organic Light Emitting Diode Drive and Control Circuit that can dynamically adjust white balance as claimed in claim 1, wherein this sequential control circuit comprises:
One source pole and grid time series data control circuit are in order to control the sequential that this gate driver circuit and this source electrode drive circuit drive this video data;
One interface treatment circuit is in order to the interface that transmits as signal; And
One wwhite balance control circuit, couple this source electrode and grid time series data control circuit and this interface treatment circuit, in order to brightness attenuation situation according to this active-matrix organic LED display panel, can adjust the adjustment parameter of the magnitude of voltage of those programmable voltage sources, transmit by this interface treatment circuit.
3. the active-matrix Organic Light Emitting Diode Drive and Control Circuit that can dynamically adjust white balance as claimed in claim 2, wherein this wwhite balance control circuit comprises at least:
One first comparer in order to this video data and a data setting value are made comparisons, produces one first comparison signal;
One counter couples this first comparer, in order to according to this first comparison signal, counts a count value of this counter;
One second comparer couples this counter, in order to this count value and a counting setting value are made comparisons, produces one second comparison signal;
One and arithmetic logic, couple this second comparer, in order to when a setting-up time arrives,, produce one and adjust signal according to this second comparison signal; And
One parameter setting unit couples this and arithmetic logic, in order to adjust signal according to this, sets the adjustment parameter of the magnitude of voltage of adjusting those programmable voltage sources, and transmits by this interface treatment circuit.
4. the active-matrix Organic Light Emitting Diode Drive and Control Circuit that can dynamically adjust white balance as claimed in claim 3, wherein this data setting value, this counting setting value and this setting-up time are stored in the ROM (read-only memory).
5. the active-matrix Organic Light Emitting Diode Drive and Control Circuit that can dynamically adjust white balance as claimed in claim 3, wherein this data setting value, this counting setting value and this setting-up time are stored in the electronics EPROM.
6. the active-matrix Organic Light Emitting Diode Drive and Control Circuit that can dynamically adjust white balance as claimed in claim 3, wherein this data setting value, this counting setting value and this setting-up time are stored in the flash memory.
7. the active-matrix Organic Light Emitting Diode Drive and Control Circuit that can dynamically adjust white balance as claimed in claim 2, wherein this interface treatment circuit provides a tandem transmission interface.
8. the white balance adjustment method of an active-matrix Organic Light Emitting Diode Drive and Control Circuit is applicable to the white balance of dynamically adjusting an active-matrix organic LED display panel, comprises the following steps:
Provide a plurality of programmable voltage sources, with respectively as the power supply of the red, green, blue pixel of this active-matrix organic LED display panel; And
According to the brightness attenuation situation of this active-matrix organic LED display panel, dynamically adjust the magnitude of voltage of those programmable voltage sources.
9. the white balance adjustment method of active-matrix Organic Light Emitting Diode Drive and Control Circuit as claimed in claim 8, wherein according to the brightness attenuation situation of this active-matrix organic LED display panel, the step of dynamically adjusting those programmable voltage sources comprises:
Receive a video data;
This video data and a data setting value are made comparisons;
When this video data is not less than this data setting value, carry one count value;
This count value and a counting setting value are made comparisons; And
When a setting-up time arrives and this count value when being not less than this counting setting value, adjust the magnitude of voltage of those programmable voltage sources.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8084780B2 (en) * | 2009-08-13 | 2011-12-27 | Semileds Optoelectronics Co. | Smart integrated semiconductor light emitting system including light emitting diodes and application specific integrated circuits (ASIC) |
| CN103559860B (en) * | 2013-08-16 | 2015-07-22 | 京东方科技集团股份有限公司 | Pixel circuit driving voltage adjusting method, pixel circuit driving voltage adjusting device, and display apparatus |
| US9620057B2 (en) | 2013-08-16 | 2017-04-11 | Boe Technology Group Co., Ltd. | Method and apparatus for adjusting driving voltage for pixel circuit, and display device |
| CN105405398B (en) * | 2015-08-28 | 2019-08-02 | 北京航空航天大学 | A kind of adjustable AMOLED display driving of white balance |
| CN107316608B (en) * | 2017-08-17 | 2019-11-26 | 深圳市华星光电半导体显示技术有限公司 | A kind of driving method and device of organic light emitting diode display |
| US10535307B2 (en) | 2017-08-17 | 2020-01-14 | Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Method and device for driving organic light emitting diode display device that includes acquiring each current flowing through each organic light emitting diode according to a video signal |
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| US20040102340A1 (en) * | 2002-11-22 | 2004-05-27 | Ho Kim Sang | Method for marking hydrocarbons with anthraquinone imines |
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| CN1336629A (en) * | 2000-07-28 | 2002-02-20 | Lg电子株式会社 | Driving circuit used for organic electroluminescent device |
| CN1393843A (en) * | 2001-06-22 | 2003-01-29 | Lg.飞利浦Lcd有限公司 | Driving circuit for active matrix organic LED |
| CN1409404A (en) * | 2001-09-28 | 2003-04-09 | 株式会社半导体能源研究所 | Light-emitting device and electromic equipment using said device |
| US20040102340A1 (en) * | 2002-11-22 | 2004-05-27 | Ho Kim Sang | Method for marking hydrocarbons with anthraquinone imines |
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