CN203311819U - Pixel driving current extraction device - Google Patents
Pixel driving current extraction device Download PDFInfo
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- CN203311819U CN203311819U CN2013204134171U CN201320413417U CN203311819U CN 203311819 U CN203311819 U CN 203311819U CN 2013204134171 U CN2013204134171 U CN 2013204134171U CN 201320413417 U CN201320413417 U CN 201320413417U CN 203311819 U CN203311819 U CN 203311819U
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Abstract
The utility model relates to the organic emitting display technology field, and especially relates to a pixel driving current extraction device. The pixel driving current extraction device comprises driving current extraction circuits respectively corresponding to pixel driving circuits of different colors; each driving current extraction circuit comprises a driving current amplifying/converting unit and a driving current calculating unit; each driving current amplifying/converting unit is connected with one pixel driving circuit and used for amplifying the driving current of the pixel driving circuit and converting the driving current to a voltage signal; each driving current calculating unit is connected with the corresponding driving current amplifying/converting unit and used for calculating the pixel driving current according to the voltage signal; and an amplification time of each driving current amplifying/converting unit in the corresponding driving current extraction circuit corresponding to one pixel driving circuit of a color is inversely proportional to a value of the pixel driving current of the color.
Description
Technical field
The utility model relates to the organic light emitting display technical field, particularly a kind of pixel driving current extraction element.
Background technology
Compare traditional liquid crystal panel, AMOLED(Active Matrix/Organic Light Emitting Diode, active matrix organic light-emitting diode) display panel has the characteristics such as reaction velocity is faster, contrast is higher, visual angle is wider, therefore, AMOLED has obtained the increasingly extensive concern of display technique developer.
Why the AMOLED display panel can luminously be by driving Thin Film Transistor (TFT) (Thin Film Transistor, TFT) electric current produced when state of saturation drives, because while inputting identical gray scale voltage, different critical voltages can produce different drive currents, cause the inconsistency of electric current, cause the unevenness of screen display.In order to obtain the information of above-mentioned inconsistency, can extract the drive current of each pixel, after obtaining the drive current of each pixel, can revise the driving voltage of each pixel, and then improve the unevenness of screen display.
Luminescence efficiency difference due to red, green, blue three color pixels of AMOLED display panel, therefore the drive current size in each color pixel is also variant, like this, when extracting drive current, if adopt the operational amplifier of identical enlargement factor, the drive current of each color pixel can be inconsistent to the duration of charging of memory capacitance, for example, the duration of charging that larger drive current needs is shorter, and the duration of charging that less drive current needs is longer, thereby causes the data that finally obtain inhomogeneous.
The utility model content
The technical matters that (one) will solve
The technical problems to be solved in the utility model is for the deficiencies in the prior art, to provide a kind of pixel driving current extraction element that can obtain even data, for the follow-up signal processing provides good Data support.
(2) technical scheme
Technical solutions of the utility model are as follows:
A kind of pixel driving current extraction element, comprise that the drive current of corresponding pixel-driving circuit of all kinds extracts circuit respectively; Each drive current extract circuit include drive current amplify converting unit and with the drive current computing unit;
Described drive current amplifies converting unit and is connected with pixel-driving circuit, amplifies and is converted to voltage signal for the drive current by pixel-driving circuit;
Described drive current computing unit amplifies converting unit with described drive current and is connected, for according to described voltage signal calculating pixel drive current;
The drive current of corresponding pixel-driving circuit of all kinds extracts the enlargement factor of the drive current amplification converting unit in circuit and the size of this color pixel drive current is inversely proportional to.
Preferably, described drive current amplification converting unit comprises the first amplifier and the first electric capacity;
The first input end of described the first amplifier is respectively with an end of the first electric capacity and should extract the pixel-driving circuit that circuit is corresponding and connect, and the second input end connects reference voltage;
The output terminal of described the first amplifier is connected with the other end and the drive current computing unit of the first electric capacity respectively;
The drive current of corresponding pixel-driving circuit of all kinds extracts the enlargement factor of the first amplifier in circuit and the size of this color pixel drive current is inversely proportional to.
Preferably, described drive current amplifies converting unit and also comprises the first switch with described the first Capacitance parallel connection.
Preferably, described pixel driving current extraction element comprises that the drive current of corresponding red, green, blue three color pixel driving circuits extracts circuit respectively; In the drive current of described red, green, blue three color pixel driving circuits extracts circuit, the drive current of corresponding green pixel driving circuit extracts the enlargement factor maximum of the first amplifier in circuit, and the drive current of corresponding blue pixel driving circuit extracts the enlargement factor minimum of the first amplifier in circuit.
Preferably, described drive current computing unit is for obtaining pixel driving current by after described voltage signal dividing potential drop, carrying out difference and amplifying computing.
Preferably, described drive current extraction element also comprises the first switch with described the first Capacitance parallel connection;
Described drive current computing unit comprises the second amplifier, second switch, the 3rd switch, the second electric capacity and the 3rd electric capacity;
The output terminal of described the first amplifier is connected with an end of described second switch and an end of the 3rd switch respectively;
The other end of described second switch is connected with an end of the second electric capacity and the first input end of the second amplifier respectively, the other end ground connection of described the second electric capacity;
The other end of described the 3rd switch is connected with an end of the 3rd electric capacity and the second input end of the second amplifier respectively, the other end ground connection of described the 3rd electric capacity.
Preferably, described the first switch, second switch and the 3rd switch are switching transistor.
Preferably, described the first switch, second switch and the 3rd switch are connected with time schedule controller respectively, and described time schedule controller is for controlling respectively the switching sequential of the first switch, second switch and the 3rd switch.
Preferably, described drive current computing unit also comprises the difference A/D converter be connected with the output terminal of described the second amplifier, and it is digital signal by analog signal conversion that described difference A/D converter is used for.
Preferably, described the first amplifier is operational amplifier, for input current is converted to voltage; Described the second amplifier is Full differential operational amplifier, be used to the voltage difference that calculates the second electric capacity and the 3rd electric capacity and amplify.
Present patent application also provides a kind of extracting method of realizing according to above-mentioned any one pixel driving current extraction element:
A kind of pixel driving current extracting method, comprise drive current leaching process and drive current computation process; In described drive current leaching process, the drive current of pixel-driving circuit amplified and be converted to voltage signal, wherein, the enlargement factor of pixel driving current of all kinds and the size of this color pixel drive current being inversely proportional to; In described drive current computation process, obtain pixel driving current by after described voltage signal dividing potential drop, carrying out difference and amplifying computing.
Preferably, comprise step:
S1: conducting the first switch, second switch and the 3rd switch make the voltage of the output terminal of the first amplifier be reset to reference voltage;
S2: turn-off the first switch, the electric current flowed into from pixel-driving circuit is to the first capacitor charging;
S3: turn-off successively second switch and the 3rd switch, obtain the magnitude of voltage of the second electric capacity and the 3rd electric capacity, calculate the voltage difference of the second electric capacity and the 3rd electric capacity and amplify by the second amplifier.
Preferably, after described step S3, also comprise:
S4: the voltage difference after amplifying is input to difference A/D converter, obtains digital signal.
(3) beneficial effect
Pixel driving current extraction element provided by the utility model, size according to pixel driving current of all kinds, it is selectively the namely less larger enlargement factor of drive current setting of pixel that luminescence efficiency is higher, for the namely less larger enlargement factor of drive current setting of the lower pixel of luminescence efficiency, thereby guaranteeing in distortionless situation, evenly extract the drive current of each color pixel, and rationally amplify, process good Data support is provided for follow-up signal.
The accompanying drawing explanation
Fig. 1 is the module connection diagram of pixel driving current extraction element in the utility model embodiment;
Fig. 2 is a kind of implementation structure schematic diagram of pixel driving current extraction element in the utility model embodiment;
Fig. 3 is the another kind of implementation structure schematic diagram of pixel driving current extraction element in the utility model embodiment;
Fig. 4 is another implementation structure schematic diagram of pixel driving current extraction element in the utility model embodiment;
Fig. 5 is the driving sequential chart that in Fig. 4, drive current extracts circuit.
In figure: 1: the first amplifier; 2: the second amplifiers; 3: difference A/D converter; 4: pixel-driving circuit.
Embodiment
Below in conjunction with drawings and Examples, embodiment of the present utility model is described further.Following examples are only be used to the utility model is described, but are not used for limiting scope of the present utility model.
At first a kind of pixel driving current extraction element is provided in the present embodiment, as shown in fig. 1, comprise that the drive current of corresponding pixel-driving circuit of all kinds extracts circuit respectively, drive current extracts main circuit will comprise that drive current amplifies converting unit and amplifies with drive current the drive current computing unit that converting unit is connected; Drive current amplifies converting unit and is connected with pixel-driving circuit, amplifies and is converted to voltage signal for the drive current by pixel-driving circuit; Drive current computing unit and drive current amplify converting unit and are connected, for according to voltage signal calculating pixel drive current; The drive current of corresponding pixel-driving circuit of all kinds extracts the enlargement factor of drive current amplification converting unit in circuit and the size of this color pixel drive current is inversely proportional to.
In the present embodiment, each color pixel is respectively red pixel (R), green pixel (G) and blue pixel (B); Three color pixel drive current IR, IG, IB access respectively drive current and amplify converting unit, and drive current amplification converting unit is converted to voltage by the current signal of input and inputs the drive current computing unit and obtains required driving current value.
As shown in Figure 2, in the present embodiment, drive current amplifies converting unit and mainly comprises the first amplifier 1 and the first capacitor C 1; The first amplifier 1 is preferably operational amplifier, and it is mainly used in input current is converted to voltage and amplifies; The first input end of the first amplifier 1 is respectively with an end of the first capacitor C 1 and should extract that the pixel-driving circuit that circuit is corresponding connects, the second input end connects reference voltage Vref, and pixel-driving circuit is mainly used in providing drive current for each color pixel; The output terminal of the first amplifier 1 is connected with the other end and the drive current computing unit of the first capacitor C 1 respectively; In order evenly to extract the drive current of each color pixel, in the present embodiment, the drive current of corresponding pixel-driving circuit of all kinds extracts the enlargement factor of the first amplifier 1 in circuit and the size of this color pixel drive current is inversely proportional to.For example, the luminescence efficiency of green pixel is the highest, so drive current minimum of green pixel, the luminescence efficiency of blue pixel is minimum, so drive current maximum of blue pixel, so the drive current of corresponding green pixel driving circuit extracts the enlargement factor maximum of the first amplifier 1 in circuit, the drive current of corresponding red pixel driving circuit extracts the enlargement factor of the first amplifier 1 in circuit and takes second place, the drive current of corresponding blue pixel driving circuit extracts the enlargement factor minimum of the first amplifier 1 in circuit, like this, the duration of charging that larger drive current needs is shortened, the duration of charging proper extension that less drive current is needed, finally make the drive current of each color pixel roughly the same to the duration of charging of the first capacitor C 1, thereby make the data that finally obtain even.
In Fig. 3, circuit is a kind of preferably implementation of above-mentioned drive current extraction element, and wherein the drive current extraction element also comprises the first switch T1 in parallel with the first capacitor C 1; The drive current computing unit comprises the second amplifier 2, second switch T2, the 3rd switch T3, the second capacitor C 2 and the 3rd capacitor C 3 etc.; The output terminal of the first amplifier 1 is connected with the end of second switch T2 and the end of the 3rd switch T3 respectively; The other end of second switch T2 is connected with an end of the second capacitor C 2 and the first input end of the second amplifier 2 respectively, the other end ground connection of the second capacitor C 2; The other end of the 3rd switch T3 is connected with an end of the 3rd capacitor C 3 and the second input end of the second amplifier 2 respectively, the other end ground connection of the 3rd capacitor C 3, the second amplifier 2 is mainly used in calculating the voltage difference of the second capacitor C 2 and the 3rd capacitor C 3 and amplifying, and it is preferably Full differential operational amplifier; Finally, the output terminal of the second amplifier 2 is connected with difference A/D converter 4, by the second amplifier 2 output analog signal conversion for convenience of the digital signal of subsequent treatment.
As shown in Figure 4, pixel-driving circuit is typical 2T1C structure, namely comprises switching transistor T5, driving transistors DTFT and memory capacitance C; The drain electrode of driving transistors DTFT provides pixel driving current, and the input end of the first amplifier 1 is connected with the drain electrode of driving transistors DTFT; In order to facilitate sequential control, the first switch T1, second switch T2 and the 3rd switch T3 all are preferably switching transistor or other controllable simulation switches; In the present embodiment, the first switch T1, second switch T2 and the 3rd switch T3 are switching transistor; Then the first switch T1, second switch T2 and the 3rd switch T3 are connected with time schedule controller respectively, time schedule controller is for controlling respectively the switching sequential of the first switch T1, second switch T2 and the 3rd switch T3.
A kind of extracting method of realizing according to above-mentioned pixel driving current extraction element also is provided in the present embodiment, and this pixel driving current extracting method mainly comprises drive current leaching process and drive current computation process; In the utility model, one of main improvement of drive current extracting method is, in the drive current leaching process, the enlargement factor of pixel driving current of all kinds and the size of this color pixel drive current are inversely proportional to, like this, the duration of charging that larger drive current needs is shortened, the duration of charging proper extension that less drive current is needed, finally make the drive current of each color pixel roughly the same to the duration of charging of the first capacitor C 1, thereby make the data that finally obtain even.
In the present embodiment, for the driving sequential of the drive current extraction element shown in Fig. 4 specifically as shown in Figure 5, below in conjunction with Fig. 4 and Fig. 5, each sequential is illustrated respectively:
S1: time schedule controller output high level signal, conducting the first switch T1, second switch T2 and the 3rd switch T3, make the voltage of the output terminal of the first amplifier 1 be reset to reference voltage Vref;
S2: under the control signal effect of time schedule controller, turn-off the first switch T1, second switch T2 and the 3rd switch T3 still keep conducting, at this moment the electric current flowed into from pixel-driving circuit 4 charges to the first capacitor C 1, the linear growth in time of the electric weight at the first capacitor C 1 two ends, therefore the voltage linear variation in time of the output terminal of the first amplifier 1;
S3: under the control signal effect of time schedule controller, turn-off successively second switch T2 and the 3rd switch T3, obtain the magnitude of voltage of the second capacitor C 2 and the 3rd capacitor C 3, wherein, the 3rd switch T3 keeps the time of conducting to keep the time of conducting long than second switch T2, therefore the voltage stored of the 3rd capacitor C 3 voltage ratio second capacitor C 2 of storing is large, the voltage that the second capacitor C 2 and the 3rd capacitor C 3 are stored is as the input of Full differential operational amplifier, by Full differential operational amplifier, calculate the voltage difference of the second capacitor C 2 and the 3rd capacitor C 3 and amplify.
Wherein, after step S3, also comprise:
S4: the voltage difference after amplifying is input to difference A/D converter 4, obtains digital signal.
Above embodiment is only be used to illustrating the utility model; and be not limitation of the utility model; the those of ordinary skill in relevant technologies field; in the situation that do not break away from spirit and scope of the present utility model; can also make a variety of changes and modification, therefore all technical schemes that are equal to also belong to protection category of the present utility model.
Claims (10)
1. a pixel driving current extraction element, is characterized in that, comprises that the drive current of corresponding pixel-driving circuit of all kinds extracts circuit respectively; Each drive current extract circuit include drive current amplify converting unit and with the drive current computing unit;
Described drive current amplifies converting unit and is connected with pixel-driving circuit, amplifies and is converted to voltage signal for the drive current by pixel-driving circuit;
Described drive current computing unit amplifies converting unit with described drive current and is connected, for according to described voltage signal calculating pixel drive current;
The drive current of corresponding pixel-driving circuit of all kinds extracts the enlargement factor of the drive current amplification converting unit in circuit and the size of this color pixel drive current is inversely proportional to.
2. drive current extraction element according to claim 1, is characterized in that, described drive current amplifies converting unit and comprises the first amplifier and the first electric capacity;
The first input end of described the first amplifier is respectively with an end of the first electric capacity and should extract the pixel-driving circuit that circuit is corresponding and connect, and the second input end connects reference voltage;
The output terminal of described the first amplifier is connected with the other end and the drive current computing unit of the first electric capacity respectively;
The drive current of corresponding pixel-driving circuit of all kinds extracts the enlargement factor of the first amplifier in circuit and the size of this color pixel drive current is inversely proportional to.
3. drive current extraction element according to claim 2, is characterized in that, described drive current amplification converting unit also comprises the first switch with described the first Capacitance parallel connection.
4. according to the described drive current extraction element of claim 2 or 3, it is characterized in that, described pixel driving current extraction element comprises that the drive current of corresponding red, green, blue three color pixel driving circuits extracts circuit respectively;
In the drive current of described red, green, blue three color pixel driving circuits extracts circuit, the drive current of corresponding green pixel driving circuit extracts the enlargement factor maximum of the first amplifier in circuit, and the drive current of corresponding blue pixel driving circuit extracts the enlargement factor minimum of the first amplifier in circuit.
5. according to the described drive current extraction element of claim 2 or 3, it is characterized in that, described drive current computing unit is for obtaining pixel driving current by after described voltage signal dividing potential drop, carrying out difference and amplifying computing.
6. drive current extraction element according to claim 5, is characterized in that, described drive current computing unit comprises the second amplifier, second switch, the 3rd switch, the second electric capacity and the 3rd electric capacity;
The output terminal of described the first amplifier is connected with an end of described second switch and an end of the 3rd switch respectively;
The other end of described second switch is connected with an end of the second electric capacity and the first input end of the second amplifier respectively, the other end ground connection of described the second electric capacity;
The other end of described the 3rd switch is connected with an end of the 3rd electric capacity and the second input end of the second amplifier respectively, the other end ground connection of described the 3rd electric capacity.
7. drive current extraction element according to claim 6, is characterized in that, described the first switch, second switch and the 3rd switch are switching transistor.
8. drive current extraction element according to claim 7, it is characterized in that, described the first switch, second switch and the 3rd switch are connected with time schedule controller respectively, and described time schedule controller is for controlling respectively the switching sequential of the first switch, second switch and the 3rd switch.
9. drive current extraction element according to claim 6, it is characterized in that, described drive current computing unit also comprises the difference A/D converter be connected with the output terminal of described the second amplifier, and it is digital signal by analog signal conversion that described difference A/D converter is used for.
10. according to the described drive current extraction element of claim 6-9 any one, it is characterized in that, described the first amplifier is operational amplifier, for input current is converted to voltage; Described the second amplifier is Full differential operational amplifier, be used to the voltage difference that calculates the second electric capacity and the 3rd electric capacity and amplify.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013204134171U CN203311819U (en) | 2013-07-11 | 2013-07-11 | Pixel driving current extraction device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013204134171U CN203311819U (en) | 2013-07-11 | 2013-07-11 | Pixel driving current extraction device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103354081A (en) * | 2013-07-11 | 2013-10-16 | 京东方科技集团股份有限公司 | Pixel driving current extracting device and method |
| CN103956138A (en) * | 2014-04-18 | 2014-07-30 | 京东方科技集团股份有限公司 | AMOLED pixel drive circuit, method and display device |
| CN110060637A (en) * | 2019-05-28 | 2019-07-26 | 京东方科技集团股份有限公司 | Pixel-driving circuit, driving method, display panel and display device |
| CN110880293A (en) * | 2019-12-09 | 2020-03-13 | 上海视欧光电科技有限公司 | Pixel compensation circuit, display panel and pixel compensation method |
| CN114863870A (en) * | 2022-05-10 | 2022-08-05 | 绵阳惠科光电科技有限公司 | Drive control circuit and display device |
-
2013
- 2013-07-11 CN CN2013204134171U patent/CN203311819U/en not_active Withdrawn - After Issue
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103354081A (en) * | 2013-07-11 | 2013-10-16 | 京东方科技集团股份有限公司 | Pixel driving current extracting device and method |
| CN103354081B (en) * | 2013-07-11 | 2016-04-20 | 京东方科技集团股份有限公司 | Pixel driving current extraction element and pixel driving current extracting method |
| US9437139B2 (en) | 2013-07-11 | 2016-09-06 | Boe Technology Group Co., Ltd. | Pixel driving current extracting apparatus and pixel driving current extracting method |
| CN103956138A (en) * | 2014-04-18 | 2014-07-30 | 京东方科技集团股份有限公司 | AMOLED pixel drive circuit, method and display device |
| CN103956138B (en) * | 2014-04-18 | 2015-04-08 | 京东方科技集团股份有限公司 | AMOLED pixel drive circuit, method and display device |
| WO2015158091A1 (en) * | 2014-04-18 | 2015-10-22 | 京东方科技集团股份有限公司 | Amoled pixel drive circuit, method and display device |
| US10152916B2 (en) | 2014-04-18 | 2018-12-11 | Boe Technology Group Co., Ltd. | AMOLED pixel driving circuit, method and display device |
| CN110060637A (en) * | 2019-05-28 | 2019-07-26 | 京东方科技集团股份有限公司 | Pixel-driving circuit, driving method, display panel and display device |
| CN110060637B (en) * | 2019-05-28 | 2022-02-01 | 京东方科技集团股份有限公司 | Pixel driving circuit, driving method, display panel and display device |
| CN110880293A (en) * | 2019-12-09 | 2020-03-13 | 上海视欧光电科技有限公司 | Pixel compensation circuit, display panel and pixel compensation method |
| CN114863870A (en) * | 2022-05-10 | 2022-08-05 | 绵阳惠科光电科技有限公司 | Drive control circuit and display device |
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Granted publication date: 20131127 Effective date of abandoning: 20160420 |
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