CN112071261A - Micro LED pixel circuit and driving method - Google Patents
Micro LED pixel circuit and driving method Download PDFInfo
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- CN112071261A CN112071261A CN202010998785.1A CN202010998785A CN112071261A CN 112071261 A CN112071261 A CN 112071261A CN 202010998785 A CN202010998785 A CN 202010998785A CN 112071261 A CN112071261 A CN 112071261A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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Abstract
The invention discloses a micro LED pixel circuit and a driving method thereof, and relates to the technical field of LED circuits. The LED scanning circuit comprises a first transistor, wherein one end gate of the first transistor is electrically connected with a constant bias signal VB, the other end of the first transistor is electrically connected with a third transistor through a linear speed gate, one end of the third transistor is electrically connected with an LED lamp through a wiring harness source, the other end of the third transistor is electrically connected with a storage capacitor through a wiring harness source, one end gate of the storage capacitor is electrically connected with a scanning voltage line SWP, and the other end gate of the storage capacitor is electrically connected with a second transistor. According to the invention, the p-node voltage of the LED can be converted into the light-emitting time by arranging the first transistor, the second transistor, the third transistor, the capacitor and the voltage storage, so that the light-emitting current is fixed, the problem of chromaticity shift under different currents is solved, different chromaticities of pixels under different gray scales can be conveniently regulated and controlled, and the display effect is improved.
Description
Technical Field
The invention belongs to the technical field of LED circuits, and particularly relates to a pixel circuit of a micro LED and a driving method.
Background
The LED is a display image quality technical processing engine developed for electronic medical display and liquid crystal televisions, a multi-partition independent backlight control and picture engine technology is adopted, the image brightness, the image contrast, the image layering, dark field details, color accurate reduction, image fluency and response speed are greatly improved compared with the traditional LED display, the current pixel is modulated in a variable voltage mode, the LED pixel driving current is regulated and controlled in a voltage mode, and different gray scale brightness of the LED is generated, and the pixel part: the scanning line SL is turned on step by step to enable the voltage level of the data signal line DL to be stored in C, different driving currents are converted by means of the I-V characteristic of the T1 transistor to enable LED pixels to have different gray scale brightness, however, the existing LED circuit has certain defects when in use, the control voltage of the low gray scale is very fine due to the fact that the T1 transistor is close to a cut-off region, the level reaches 1mV, errors of the low gray scale are serious, due to the characteristic of the LED, different driving currents enable the LED to emit light with different colors, pixels under different gray scales under the regulation and control of variable voltage have different colors, and the display effect is affected.
Disclosure of Invention
The invention aims to provide a pixel circuit and a driving method of a micro LED, which aim to solve the existing problems: because the T1 transistor is close to the cut-off region, the control of the low gray scale control voltage is very fine and reaches the level of 1mV, so that the error of the low gray scale is serious, and because of the characteristics of the LED, different driving currents can cause the deviation of the luminous color of the LED, so that pixels under different gray scales under the regulation and control of variable voltage have different colors, and the display effect is influenced.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a pixel circuit of a micro LED and a driving method thereof, comprising a first transistor, wherein one end gate of the first transistor is electrically connected with a constant bias voltage signal VB, the other end of the first transistor is electrically connected with a third transistor through a linear speed gate, and one end of the third transistor is electrically connected with an LED lamp through a wiring harness source.
Furthermore, the other end of the third transistor is electrically connected to a storage capacitor through a wiring harness source, and one end of the storage capacitor is electrically connected to a gate of the storage capacitor through a scanning voltage line SWP.
Further, the gate stage at the other end of the storage capacitor is electrically connected to a second transistor, and one end of the second transistor is electrically connected to a data signal line DL through a wiring harness source stage.
Furthermore, the data signal line DL stores a voltage signal at a P node through a second transistor, and is electrically connected to the storage capacitor and a source of a third transistor.
Further, the other end of the second transistor is electrically connected to a scan line SL through a wire harness gate.
Further, the first transistor is driven by constant voltage and constant current.
Further, the voltage of the P node rises with the scan voltage line SWP due to the storage capacitance coupling.
Further, the LED lamp is connected with the third transistor in series through a wire harness.
The invention has the following beneficial effects:
1. the LED display device can fix the LED luminous current by arranging the first transistor, the second transistor, the third transistor, the capacitor and the voltage storage, solves the problem of chromaticity shift under different currents, is convenient to regulate and control different chromaticities of pixels under different gray scales and improves the display effect.
2. The scanning voltage line is arranged to be compensated by the SWP, the SWP voltage can compensate the leakage current, the leakage current is compensated by adjusting the gradient degree of the SWP, the problem of the leakage current of the small-spacing LED is solved, and the display effect of the LED can be improved.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a circuit diagram of a pixel portion according to the present invention;
FIG. 2 is a timing diagram of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. a first transistor; 2. a second transistor; 3. a third transistor; 4. a storage capacitor; 5. a data signal line DL; 6. a scan line SL; 7. scanning the voltage line SWP; 8. an LED lamp; 9. and (4) a P node.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, the present invention is a pixel circuit of micro LED and a driving method thereof, including a first transistor 1, one end gate of the first transistor 1 is electrically connected to a constant bias signal VB, the other end of the first transistor 1 is electrically connected to a third transistor 3 through a linear speed gate, one end of the third transistor 3 is electrically connected to an LED lamp 8 through a wiring harness source, the first transistor 1 is biased by the constant bias signal VB to generate a fixed current and gradually turn on a scanning line SL6, and the first transistor 1, the second transistor 2 and the third transistor 3 can be CMOS, TFT and TFT.
The other end of the third transistor 3 is electrically connected to a storage capacitor 4 through a wiring harness source, one end gate of the storage capacitor 4 is electrically connected to a scan voltage line SWP7, and the voltage of the P node 9 in the P node 9 under the action of the storage capacitor 4 is the sum of the voltage of the data signal line DL5 and the voltage of the scan voltage line SWP 7.
The other end of the storage capacitor 4 is electrically connected with a second transistor 2 in a gate mode, one end of the second transistor 2 is electrically connected with a data signal line DL5 through a wiring harness source, the data signal line DL5 stores a voltage signal in a P node 9 through the second transistor 2 and is electrically connected with the storage capacitor 4 and a third transistor 3 source, the other end of the second transistor 2 is electrically connected with a scanning line SL6 through a wiring harness gate mode, the first transistor 1 is driven by constant voltage and constant current, the voltage of the P node 9 is raised along with a scanning voltage line SWP7 due to the coupling of the storage capacitor 4, the LED lamp 8 is connected with the third transistor 3 in series through a wiring harness, when the sum of the voltage at the data signal line DL5 and the voltage of the scanning voltage line SWP7 exceeds a cut-off voltage V _ cutoff voltage of the third transistor 3, the third transistor 3 is turned off, the LED lamp 8 is also turned off and cannot emit light, the other end of the second transistor 2 is electrically connected with a scanning line, the series connection allows the third transistor 3 to better control the switching of the LED lamp 8.
One specific application of this embodiment is: the first transistor 1 is biased by a constant voltage VB to generate a fixed current, the scanning line SL6 is turned on step by step, the voltage V level of the data signal line DL5 is stored in the P node 9, the scanning voltage line SWP7 is pulled up gradually in a frame, the voltage of the P node 9 is coupled into V + DSWP by the storage capacitor 4, when the V + DSWP exceeds the cut-off voltage V _ cutoff of the third transistor 3, the third transistor 3 is turned off, the LED lamp 8 is also turned off to not emit light, the data voltage V is adjusted by the mechanism, so that the time for the P node 9 to reach the V _ cutoff in a frame is different, the P node has different light emitting time, and the effect of changing the voltage to adjust the light emitting time is achieved.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (8)
1. A pixel circuit and a driving method of micro LED, comprising a first transistor (1), characterized in that: one end gate level of the first transistor (1) is electrically connected with a constant bias voltage signal VB, the other end of the first transistor (1) is electrically connected with a third transistor (3) through a linear speed gate level, and one end of the third transistor (3) is electrically connected with an LED lamp (8) through a wire harness source level.
2. The pixel circuit and the driving method of micro LED as claimed in claim 1, wherein: the other end of the third transistor (3) is electrically connected with a storage capacitor (4) through a wire harness source, and one end gate of the storage capacitor (4) is electrically connected with a scanning voltage wire SWP (7).
3. The pixel circuit and the driving method of micro LED as claimed in claim 2, wherein: the other end of the storage capacitor (4) is electrically connected with a second transistor (2) in a gate stage mode, and one end of the second transistor (2) is electrically connected with a data signal line DL (5) through a wiring harness source stage mode.
4. The pixel circuit and driving method of micro LED as claimed in claim 3, wherein: the data signal line DL (5) stores a voltage signal at a P node (9) through the second transistor (2), and is electrically connected to the storage capacitor (4) and the source of the third transistor (3).
5. The pixel circuit and the driving method of micro LED as claimed in claim 4, wherein: the other end of the second transistor (2) is electrically connected with a scanning line SL (6) through a wiring harness gate level.
6. The pixel circuit and the driving method of micro LED as claimed in claim 1, wherein: the first transistor (1) is driven by constant voltage and constant current.
7. The pixel circuit and the driving method of micro LED as claimed in claim 4, wherein: the voltage of the P node (9) rises along with the scanning voltage line SWP (7) due to the coupling of the storage capacitor (4).
8. The pixel circuit and the driving method of micro LED as claimed in claim 1, wherein: the LED lamp (8) is connected with the third transistor (3) in series through a wire harness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010998785.1A CN112071261A (en) | 2020-09-22 | 2020-09-22 | Micro LED pixel circuit and driving method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010998785.1A CN112071261A (en) | 2020-09-22 | 2020-09-22 | Micro LED pixel circuit and driving method |
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| CN112071261A true CN112071261A (en) | 2020-12-11 |
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| CN202010998785.1A Pending CN112071261A (en) | 2020-09-22 | 2020-09-22 | Micro LED pixel circuit and driving method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113963657A (en) * | 2021-11-16 | 2022-01-21 | 禹创半导体(深圳)有限公司 | Digital-analog hybrid drive ULED method |
| CN115206231A (en) * | 2022-09-06 | 2022-10-18 | 禹创半导体(深圳)有限公司 | Micro LED scanning drive circuit suitable for simulating PWM drive |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1932626A (en) * | 2005-08-31 | 2007-03-21 | 三洋爱普生映像元器件有限公司 | Liquid crystal display device |
| JP5218879B2 (en) * | 2004-02-03 | 2013-06-26 | エルジー エレクトロニクス インコーポレイティド | Electroluminescence display device and driving method thereof |
| CN103869866A (en) * | 2012-12-14 | 2014-06-18 | 力智电子股份有限公司 | Reference voltage generator of grid drive circuit and reference voltage generating method |
| CN104778915A (en) * | 2014-01-15 | 2015-07-15 | 北京大学深圳研究生院 | Display device and pixel circuit and display driving method thereof |
| CN107545867A (en) * | 2016-06-28 | 2018-01-05 | 精工爱普生株式会社 | Display device and electronic equipment |
| CN109671398A (en) * | 2019-02-28 | 2019-04-23 | 厦门天马微电子有限公司 | Driving method, display panel and the display device of pixel-driving circuit |
| US10371799B1 (en) * | 2013-12-20 | 2019-08-06 | Delta Mobile Systems, Inc | Methods of calibration for radar apparatus |
| CN110827755A (en) * | 2019-11-22 | 2020-02-21 | 武汉天马微电子有限公司 | Display panel and device, power supply voltage detection and compensation circuit and method |
| CN111210767A (en) * | 2020-03-05 | 2020-05-29 | 深圳市华星光电半导体显示技术有限公司 | Pixel driving circuit, driving method thereof and display panel |
-
2020
- 2020-09-22 CN CN202010998785.1A patent/CN112071261A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5218879B2 (en) * | 2004-02-03 | 2013-06-26 | エルジー エレクトロニクス インコーポレイティド | Electroluminescence display device and driving method thereof |
| CN1932626A (en) * | 2005-08-31 | 2007-03-21 | 三洋爱普生映像元器件有限公司 | Liquid crystal display device |
| CN103869866A (en) * | 2012-12-14 | 2014-06-18 | 力智电子股份有限公司 | Reference voltage generator of grid drive circuit and reference voltage generating method |
| US10371799B1 (en) * | 2013-12-20 | 2019-08-06 | Delta Mobile Systems, Inc | Methods of calibration for radar apparatus |
| CN104778915A (en) * | 2014-01-15 | 2015-07-15 | 北京大学深圳研究生院 | Display device and pixel circuit and display driving method thereof |
| CN107545867A (en) * | 2016-06-28 | 2018-01-05 | 精工爱普生株式会社 | Display device and electronic equipment |
| CN109671398A (en) * | 2019-02-28 | 2019-04-23 | 厦门天马微电子有限公司 | Driving method, display panel and the display device of pixel-driving circuit |
| CN110827755A (en) * | 2019-11-22 | 2020-02-21 | 武汉天马微电子有限公司 | Display panel and device, power supply voltage detection and compensation circuit and method |
| CN111210767A (en) * | 2020-03-05 | 2020-05-29 | 深圳市华星光电半导体显示技术有限公司 | Pixel driving circuit, driving method thereof and display panel |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113963657A (en) * | 2021-11-16 | 2022-01-21 | 禹创半导体(深圳)有限公司 | Digital-analog hybrid drive ULED method |
| CN115206231A (en) * | 2022-09-06 | 2022-10-18 | 禹创半导体(深圳)有限公司 | Micro LED scanning drive circuit suitable for simulating PWM drive |
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Application publication date: 20201211 |
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