CN111710289A - Pixel driving circuit and driving method of active light-emitting device - Google Patents
Pixel driving circuit and driving method of active light-emitting device Download PDFInfo
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- CN111710289A CN111710289A CN202010593908.3A CN202010593908A CN111710289A CN 111710289 A CN111710289 A CN 111710289A CN 202010593908 A CN202010593908 A CN 202010593908A CN 111710289 A CN111710289 A CN 111710289A
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000000694 effects Effects 0.000 claims description 5
- 230000000087 stabilizing effect Effects 0.000 claims description 5
- 230000000295 complement effect Effects 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 229920001621 AMOLED Polymers 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
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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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- 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]
- G09G3/3208—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] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—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] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—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] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
Abstract
The invention provides a pixel driving circuit and method of an active light emitting device, the circuit includes: the driving end of the driving unit is connected with the light-emitting device; a drive signal write unit; the signal maintaining unit is connected between the drive signal writing unit and the control end of the drive unit; and the feedback unit is connected with the driving end of the driving unit and the input end of the signal maintaining unit. The invention uses the signal maintaining unit and the feedback unit to replace the storage module in the prior art, and the whole pixel driving circuit has only five transistors, thereby effectively reducing the realization area of the pixel unit, being beneficial to improving the resolution of the display and maintaining stable driving current in the light-emitting stage.
Description
Technical Field
The invention relates to the technical field of integrated circuits and display, in particular to a pixel driving circuit and a driving method of an active light-emitting device.
Background
In many electronic products, displays play an important role, and with the development of technology, there is a great demand for displays with high resolution, high refresh rate, high brightness, and low power consumption. Active light emitting displays, such as AMOLED displays, are gradually becoming powerful competitors in the next generation of display technology due to their advantages of low power consumption, self-luminescence, wide viewing angle, simple process, low cost, good temperature adaptability, fast response speed, etc. currently, LCD technology is being replaced. The display performance of the display is not only dependent on the manufacturing material of the display, but also the performance of the display driving circuit is crucial, and the driving circuit is an essential part for ensuring the normal operation of the display, otherwise, the display brightness, color purity, gray scale of display, response time, power consumption and other performance differences of the display can be caused. Therefore, designing a high performance ASIC that meets the display characteristics is a hot spot in the field of integrated circuit design.
The gray scale modulation mode of the active light emitting device generally comprises amplitude modulation and time modulation, wherein the amplitude gray scale modulation realizes gray scale by controlling different currents, the time gray scale modulation adopts constant driving current, and the gray scale is realized by controlling the light emitting time in a time unit, so that the control of a driving circuit only needs to adopt digital signals. A conventional pixel driving circuit having a classical 6T structure is used in accordance with a time gray scale modulation method. However, since the structure includes 6 transistors, a certain implementation area is consumed, and in a 0.18um cmos process, the area of the SRAM is about 2um × 4um, and as the resolution of the display is improved, even when the resolution reaches 2K, the implementation area of the pixel unit driving circuit is required to be reduced as much as possible.
Disclosure of Invention
In view of this, the present invention provides a pixel driving circuit and a driving method of an active light emitting device, in which a signal maintaining unit and a feedback unit are used to replace a memory module in the prior art, and the whole pixel driving circuit has only five transistors, so that the implementation area of the pixel unit is effectively reduced, the improvement of the resolution of the display is facilitated, and a stable driving current can be maintained in the light emitting stage.
A first aspect of the present invention provides a pixel driving circuit of an active light emitting device, the circuit comprising:
the driving end of the driving unit is connected with the light-emitting device;
a drive signal write unit;
the signal maintaining unit is connected between the drive signal writing unit and the control end of the drive unit; and
and the feedback unit is connected with the driving end of the driving unit and the input end of the signal maintaining unit.
Preferably, the feedback unit is a feedback transistor.
Preferably, the gate of the feedback transistor is connected to a row of driving signals, the source is connected to the control end of the driving unit, and the drain is connected to the input end of the signal maintaining unit.
Preferably, the driving signal writing unit is a writing transistor, and the drain of the writing transistor is connected to the input terminal of the signal maintaining unit; the grid electrode is connected with a row of driving signals, and the source electrode is connected with a column of driving signals.
Preferably, the write transistor and the feedback transistor are complementary transistors.
Preferably, the signal maintaining unit is an inverter formed of the second transistor and the third transistor.
Preferably, the driving unit is a driving transistor.
Preferably, the gate of the driving transistor is connected to the output terminal of the signal maintaining unit, the source is connected to a power source, and the drain is connected to the light emitting device.
A second aspect of the present invention provides a driving method of the pixel driving circuit of the active light emitting device, the driving method comprising:
the feedback unit feeds back the driving voltage of the light emitting device to the output end of the driving signal writing unit so as to realize the effect of stabilizing the driving current.
Preferably, when the light emitting device is turned on, the driving voltage of the light emitting device is at a high level, the feedback unit feeds the high level back to the output end of the driving signal writing unit, and the output end of the driving signal writing unit maintains the high level; when the light emitting device is not conducted, the driving voltage of the light emitting device is low level, the feedback unit feeds the low level back to the output end of the driving signal writing unit, and the output end of the driving signal writing unit maintains the low level.
The invention has the advantages and positive effects that: the invention uses the signal maintaining unit and the feedback unit to replace the storage module in the prior art, and the whole pixel driving circuit has only five transistors, thereby effectively reducing the realization area of the pixel unit, being beneficial to improving the resolution of the display and maintaining stable driving current in the light-emitting stage.
Drawings
Fig. 1 is a schematic structural view of a pixel driving circuit of an active light emitting device of the present invention;
FIG. 2 is a waveform diagram illustrating the operation of a pixel driving circuit of the active light emitting device of the present invention;
fig. 3 is a schematic diagram of a pixel driving circuit of an active light emitting device in the related art.
Detailed Description
For a better understanding of the present invention, reference is made to the following detailed description and accompanying drawings that illustrate the invention.
The invention provides a pixel driving circuit of an active Light Emitting device, which can be used for driving Light Emitting devices such as Micro Light Emitting diodes (Micro-LED/mu LED) or Organic Light Emitting Diodes (OLED). And the pixel driving circuit can adopt a digital driving method to control the brightness of the light-emitting device.
The switching transistor and the driving transistor adopted in all the embodiments of the present invention can be thin film transistors or field effect transistors or other devices with the same characteristics. Preferably, the thin film transistor used in the embodiment of the present invention may be an oxide semiconductor transistor. Since the source and drain of the switching transistor used here are symmetrical, the source and drain can be interchanged. In the embodiment of the present invention, in order to distinguish two electrodes of a transistor except for a gate, one of the electrodes is referred to as a source and the other electrode is referred to as a drain.
Specifically, the circuit includes: a driving unit 10, wherein a driving end of the driving unit 10 is connected with the light-emitting device 60; a drive signal write unit 20; a signal maintaining unit 30, wherein the signal maintaining unit 30 is connected between the driving signal writing unit 20 and the control terminal of the driving unit 10; and a feedback unit 50, wherein the feedback unit 50 is connected to the driving end of the driving unit 10 and the input end of the signal maintaining unit 30.
In a specific working process, the driving signal writing unit 20 receives a driving signal and writes the driving signal into the signal maintaining unit 30 connected with the driving signal writing unit, the signal maintaining unit 30 is used for maintaining the electric potential of the control end of the driving unit 10, and the feedback unit 50 collects the electric potential of the driving end of the driving unit 10 and feeds the electric potential back to the output end of the driving signal writing unit 20; specifically, when the light emitting device 60 is turned on, the driving voltage of the light emitting device 60 is at a high level, the feedback unit 50 feeds the high level back to the output end of the driving signal writing unit 20, and the output end of the driving signal writing unit 20 maintains the high level; when the light emitting device 60 cannot be turned on, the driving voltage of the light emitting device 60 is at a low level, the feedback unit 50 feeds the low level back to the output terminal of the driving signal writing unit 20, and the output terminal of the driving signal writing unit 20 maintains the low level. The present invention realizes the effect of stabilizing the driving current by providing a signal maintaining unit 30 and a feedback unit 50 to feed back the potential at the driving end of the driving unit 10 to the output end of the driving signal writing unit 20.
Further, as shown in fig. 1, in an embodiment of the present invention, the feedback unit 50 is a feedback transistor T5; the gate of the feedback transistor T5 is connected to a ROW driving signal ROW to receive ROW driving data ROW; the source is connected with the control end of the driving unit 10, and the drain is connected with the input end of the signal maintaining unit 30; the signal sustain unit 10 is an inverter composed of a second transistor T2 and a third transistor T3; the driving signal writing unit 20 is a writing transistor T1, the drain of the writing transistor T1 is connected to the input terminal of the signal maintaining unit 30; the grid electrode is connected with a ROW driving signal ROW, and the source electrode is connected with a column driving signal DATA; the driving unit 10 is a driving transistor T4, the gate of the driving transistor T4 is connected to the output terminal of the signal maintaining unit 30, the source is connected to a power source VDD, the drain is connected to the light emitting device 60, and the writing transistor T1 and the feedback transistor T5 are complementary transistors.
In a specific embodiment of the present invention, the second transistor T2 is a P-type transistor, the third transistor T3 is an N-type transistor, the write transistor T1 is a P-type transistor, the feedback transistor T5 is an N-type transistor, and the light emitting device 60 is an organic light emitting diode OLED, and the operation of the pixel driving circuit of the present invention is described with reference to the waveforms shown in fig. 2, wherein the output terminal of the write transistor T1 is also an input terminal of an inverter a, the output terminal of the inverter is also an input terminal of a driving transistor T4B, and the input terminal of the light emitting device is also an output terminal of a driving transistor T4 is C.
Specifically, when the column driving signal DATA is "1" and the ROW driving signal ROW is "0", the writing transistor T1 is turned on, a high level is transmitted to the point a of the inverter input terminal, and the point B of the inverter output terminal, i.e. the gate voltage of the driving transistor T4, is "0", then the driving transistor T4 operates in the amplification region to provide the driving current for the OLED, which emits light, the current is determined by the size of the driving transistor T4, and the OLED is turned on to raise the point C voltage to a high level. The feedback transistor T5 is turned off at this time, and does not affect the circuit state. When the ROW driving signal ROW is "1", the write transistor T1 is turned off, the feedback transistor T5 is turned on, the voltage at the point C is transmitted to the point a, and the high level at the point a is maintained.
When the column driving signal DATA is "0" and the ROW driving signal ROW is "0", the writing transistor T1 is turned on, because the second transistor T2 has threshold loss while transmitting low level, the voltage at the point a of the inverter input terminal is discharged to the threshold voltage | VTHP | of the second transistor T2, the voltage at the point B of the inverter output terminal is close to VDD, the driving transistor T4 is in the cut-off region with no driving current, the OLED does not emit light, and the voltage at the point C is low level. When the ROW driving signal ROW is "1", the writing transistor T1 is turned off, and if there is no feedback transistor T5 and the voltage at point a is an indeterminate value between 0 and VDD, the gate voltage of the driving transistor T4 is unstable; if the feedback transistor T5 is turned on and then transmits the low level at point C to point a, the low level at point a is maintained.
The inverter and the feedback transistor T5 provide feedback to the voltage written to the output terminal of the transistor T1 by using the high level of the anode when the OLED emits light and the low level of the anode when the OLED does not emit light, instead of a bistable circuit formed by two stages of inverters connected end to end in a ring in the 6T circuit, to latch data, thereby achieving the effect of stabilizing the driving current.
In the embodiment of using the light emitting diode LED as the light emitting device, the circuit operation process is similar, and therefore, the detailed description is omitted.
In the prior art, the pixel driving circuit uses an SRAM structure, i.e., a bistable circuit formed by two stages of inverters connected end to end in a ring shape to maintain pixel data. The conventional pixel driving circuit includes a driving module 10a, wherein the driving module 10a is used for driving the light emitting device 60a to emit light; a data writing module 20a, wherein the data writing module 20a is configured to write a data signal into a control terminal of the driving module 10 a; a memory module 30a, wherein the memory module 30a is used for maintaining the electric potential of the control terminal of the driving module 10 a. Specifically, as shown in fig. 1, the driving module 10a employs a sixth transistor T6a, the data writing module 20a employs a first transistor T1a, and the storage module 30a employs two-stage inverters which are annularly connected end to end, and specifically includes a second transistor T2a, a third transistor T3a, a fourth transistor T4a, and a fifth transistor T5 a; when the ROW driving signal ROW is asserted, the first transistor T1a is turned on, transmitting the column driving DATA to the gate of the sixth transistor T6, thereby supplying a driving current to the light emitting device 60 a; and when the ROW is invalid, the bistable circuit latches the data and provides stable driving current. However, the structure includes 6 transistors, which consumes a certain implementation area, and in a 0.18um CMOS process, the area of the SRAM is about 2um × 4um, and as the resolution of the display is improved, even when the resolution reaches 2K, the implementation area of the pixel unit driving circuit is required to be reduced as much as possible.
In the present invention, the signal maintaining unit 30 and the feedback unit 50 are used to replace the storage module 30a in the prior art, and the whole pixel driving circuit has only five transistors, so that the implementation area of the pixel unit is effectively reduced, the improvement of the resolution of the display is facilitated, and the stable driving current can be maintained in the light emitting stage.
A second aspect of the present invention provides a method of pixel circuit of an active light emitting device: the feedback unit 50 feeds back the driving voltage of the light emitting device to the output terminal of the driving signal writing unit to achieve the effect of stabilizing the driving current.
Specifically, when the light emitting device is turned on, the driving voltage of the light emitting device is at a high level, the feedback unit feeds the high level back to the output end of the driving signal writing unit, and the output end of the driving signal writing unit maintains the high level; when the light emitting device is not conducted, the driving voltage of the light emitting device is low level, the feedback unit feeds the low level back to the output end of the driving signal writing unit, and the output end of the driving signal writing unit maintains the low level.
The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention should be covered by the present patent.
Claims (10)
1. A pixel driving circuit of an active light emitting device, comprising: the circuit includes:
the driving end of the driving unit is connected with the light-emitting device;
a drive signal write unit;
the signal maintaining unit is connected between the drive signal writing unit and the control end of the drive unit; and
and the feedback unit is connected with the driving end of the driving unit and the input end of the signal maintaining unit.
2. The pixel driving circuit of an active light emitting device according to claim 1, wherein: the feedback unit is a feedback transistor.
3. The pixel driving circuit of an active light emitting device according to claim 2, wherein: the grid electrode of the feedback transistor is connected with a row of driving signals, the source electrode of the feedback transistor is connected with the control end of the driving unit, and the drain electrode of the feedback transistor is connected with the input end of the signal maintaining unit.
4. A pixel driving circuit of an active light emitting device according to claim 2 or 3, wherein: the drive signal writing unit is a writing transistor, and the drain electrode of the writing transistor is connected with the input end of the signal maintaining unit; the grid electrode is connected with a row of driving signals, and the source electrode is connected with a column of driving signals.
5. The pixel driving circuit of an active light emitting device according to claim 4, wherein: the write transistor and the feedback transistor are complementary transistors.
6. The pixel driving circuit of an active light emitting device according to claim 1, wherein: the signal maintaining unit is an inverter which is composed of a second transistor and a third transistor.
7. The pixel driving circuit of an active light emitting device according to claim 1, wherein: the driving unit is a driving transistor.
8. The pixel driving circuit of an active light emitting device according to claim 7, wherein: the grid electrode of the driving transistor is connected with the output end of the signal maintaining unit, the source electrode of the driving transistor is connected with a power supply, and the drain electrode of the driving transistor is connected with the light-emitting device.
9. A method of driving a pixel driving circuit of an active light emitting device according to any one of claims 1 to 8, wherein: the driving method includes:
the feedback unit feeds back the driving voltage of the light emitting device to the output end of the driving signal writing unit so as to realize the effect of stabilizing the driving current.
10. The pixel driving method of an active light emitting device according to claim 9, wherein: when the light-emitting device is switched on, the driving voltage of the light-emitting device is at a high level, the feedback unit feeds the high level back to the output end of the driving signal writing unit, and the output end of the driving signal writing unit maintains the high level; when the light emitting device is not conducted, the driving voltage of the light emitting device is low level, the feedback unit feeds the low level back to the output end of the driving signal writing unit, and the output end of the driving signal writing unit maintains the low level.
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| CN202010593908.3A CN111710289A (en) | 2020-06-24 | 2020-06-24 | Pixel driving circuit and driving method of active light-emitting device |
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| CN202010593908.3A CN111710289A (en) | 2020-06-24 | 2020-06-24 | Pixel driving circuit and driving method of active light-emitting device |
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| CN113380182B (en) * | 2021-04-21 | 2022-05-03 | 电子科技大学 | Grid-control MOS light-emitting LED pixel driving circuit |
| TWI803320B (en) * | 2021-12-09 | 2023-05-21 | 友達光電股份有限公司 | Inverter and pixel circuit |
| CN114677977A (en) * | 2022-03-10 | 2022-06-28 | 广东奥素液芯微纳科技有限公司 | Micro-fluidic pixel circuit and chip based on phase inverter |
| CN114677977B (en) * | 2022-03-10 | 2024-04-09 | 广东奥素液芯微纳科技有限公司 | Micro-fluidic pixel circuit and chip based on phase inverter |
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