CN115243424B - Analog PWM (pulse width modulation) driving circuit for Micro LED - Google Patents
Analog PWM (pulse width modulation) driving circuit for Micro LED Download PDFInfo
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- CN115243424B CN115243424B CN202211141427.4A CN202211141427A CN115243424B CN 115243424 B CN115243424 B CN 115243424B CN 202211141427 A CN202211141427 A CN 202211141427A CN 115243424 B CN115243424 B CN 115243424B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/32—Pulse-control circuits
- H05B45/325—Pulse-width modulation [PWM]
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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Abstract
The invention discloses an analog PWM (pulse width modulation) driving circuit for a Micro LED, which is characterized by comprising the following components: a data driving integration scanning comparison part capable of passing through the data signal line S [ N ] when data is written into the sub-frame]Providing a gray scale voltage signal V Data of A pixel section; and can pass through the data signal line S [ N ] when the sub-frame is scanned by emitting light]Output data scanning comparison voltage V Scanning To the pixel section. Compared with the prior art, the invention has the beneficial effects that: the invention saves the scanning driving part, reduces the IC area and reduces the IC power consumption; the data voltage and the scanning comparison voltage share the same group of reference voltages, so that the voltage matching is improved; the original wiring of the scanning driving part is reduced, and the circuit is simple.
Description
Technical Field
The invention relates to the field of driving circuits, in particular to an analog PWM driving Micro LED based on a data driving circuit integrated scanning comparison circuit.
Background
The analog PWM driven Micro LED generally includes a pixel portion, a data driving portion, a scan driving portion, and a scan comparing portion, please refer to fig. 1. The data driving part passes through the data signal line S [ N ] when data is written into the sub-frame]Providing an a-bit gray scale voltage signal V Data of (V _ data) to the pixel portion (also referred to as pixel portion). The scanning drive part outputs scanning signals which are turned on one by one to the scanning lines G [ M ] when data are written into the sub-frame]A bit gray scale voltage signal V outputted from the data driving part Data of (V _ data) Pixel storage Voltage P [ MN ] capable of being written into the pixel portion line by line]And dots, wherein m is the number of rows of pixels and n is the number of columns of pixels.
At the end of the data write sub-frame, the pixel storage voltage P [ MN ] of each pixel portion]All writing is completed. The scan comparison part outputs a data scan comparison voltage V with c = a + b bits in steps during the light-emitting scanning sub-frame Scanning (V _ Sweep), taking the pixel portion as PMOS transistor as an example, the data scanning comparison voltage V Scanning It is scanned from a low voltage to a high voltage while the light is emitted to scan the sub-frame. Taking PMOS transistor as an example, referring to FIG. 2, when the scan comparison voltage is raised, it will couple with the pixel storage voltage P [ MN ]]The point is made to rise so that the voltage after rising is P [ MN ]]’=P[MN]+a*V Scanning (t), wherein a is a coupling weight. When P [ MN]' Point is lifted to<VDD-Vth _ T3-Vds _ T1, the T3 transistor is cut off, the LED is turned off, and the light emission is finished. By giving different pixel storage voltages P [ MN ]]The on time, i.e. the light emitting time, of the light emitting diode EL of each pixel can be changed.
In the prior art, an additional scanning comparison part is arranged, and an additional scanning comparison line is needed to connect the scanning comparison part and the pixel part, so that the area of a driving chip IC is larger, more connecting lines are arranged, and the power consumption is higher.
Disclosure of Invention
The invention aims to provide an analog PWM (pulse width modulation) driving circuit based on a data driving circuit integrated scanning comparison circuit, which is suitable for driving a Micro LED (light emitting diode) and solves the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
an analog PWM drive circuit for a Micro LED, comprising:
a data driving integration scanning comparison part capable of passing through the data signal line S [ N ] when data is written into the sub-frame]Providing a gray scale voltage signal V Data of A pixel section; and can pass through the data signal line S [ N ] when the sub-frame is scanned by emitting light]Output data scan comparison voltage V Scanning To the pixel section.
Preferably, the a-bit gray scale voltage signal V is provided during a data write sub-frame Data of A pixel section; outputting a data scanning comparison voltage V with c = a + b bits when a subframe is scanned by light emission Scanning As a reference voltage to the pixel portion.
Preferably, the data driving integration scanning comparison unit includes a set of data output stages, a set of c = a + b bit reference voltages, a set of digital-to-analog converters DAC, a shift register and a counter; the output ends of the counter and the shift register are connected with the input end of a digital-to-analog converter (DAC), and the output end of the DAC is connected with a data output stage; the shift register is used for receiving digital pixel data Din at the front end when data are written into a subframe;the counter is based on a scan enable signal S when emitting light to scan the sub-frame EN Sequentially outputting 0-2 c-1 A digital signal; the digital-analog converter DAC receives the digital pixel data Din when data are written into a subframe, and converts the digital pixel data Din into analog pixel data; the DAC receives the 0-2 during the light-emitting scanning sub-frame c-1 Order digital signal, and will be 0-2 c-1 The order digital signal is converted into an analog signal; the data output stage receives the analog pixel data and outputs an a-bit gray scale voltage signal V when data is written into a sub-frame Data of Outputting a c = a + b bit data voltage V based on the analog signal at the time of light emission scanning sub-frame Scanning As a reference voltage.
Preferably, the pixel portion circuit comprises a switching tube T2 and a driving tube T3, wherein a source electrode of the switching tube T2 is connected to a gate electrode of the driving tube T3, a drain electrode of the switching tube T2 is connected to an output end of the first transmission gate TG1, a gate electrode of the switching tube T2 receives the scanning driving signal G [ M ], a drain electrode of the driving tube T3 is connected to an anode of the light emitting diode, a cathode of the light emitting diode is grounded, a source electrode of the driving tube T3 is connected to a power supply voltage or is connected to the power supply voltage through the transistor T1, a source electrode of the switching tube T2 is connected to the driving tube T3 through a lead and has a pixel storage voltage point P [ MN ] on the lead, and the point P [ MN ] is connected to the second transmission gate TG2 through a capacitor C.
Preferably, the scanning device further comprises a scanning driving part which provides a control signal F [ M ]]According to a control signal F [ M ]]Opening the first transmission gate TG1 to receive the data line S [ N ] in the data writing sub-frame]Data voltage V of Data of And opening the second transmission gate TG2 to receive the data signal line S [ N ] during the light-emitting scanning sub-frame]Scanning comparison voltage V Scanning 。
Preferably, the switch tube T2 and the driving tube T3 are PMOS transistors.
Preferably, at the end of the data writing sub-frame, the pixel storage voltage point P [ MN ] of each pixel portion is completely written.
Preferably, when scanning the comparison voltage V Scanning When the voltage is raised, the scanning comparison voltage V is obtained through the capacitor C Scanning Coupled to a pixel storage voltage P [ MN]Point, so that the coupled pixel voltage is P [ MN ]]’=P[MN]+a* V Scanning (t), wherein a is a coupling weight.
Preferably, the analog PWM driving is an analog PWM driving circuit for driving the Micro LED.
Compared with the prior art, the invention has the beneficial effects that: the invention saves a scanning driving part, reduces the IC area, reduces the IC power consumption, simultaneously sets the data voltage and the scanning comparison voltage to share the same group of reference voltage, improves the voltage matching, reduces the scanning fan-out routing of the original scanning line and simplifies the whole chip circuit.
Drawings
FIG. 1 is a schematic diagram of a conventional analog PWM driving a Micro LED.
FIG. 2 is a circuit diagram of a conventional analog PWM driven pixel circuit.
FIG. 3 is a schematic diagram of an analog PWM driving circuit based on a data driving circuit integrated with a scan comparison circuit according to the present invention.
FIG. 4 is a schematic diagram of a data integration scan comparison unit.
Fig. 5 shows output waveforms of the data integration scanning comparator in the data write sub-frame and the light emission scanning sub-frame.
FIG. 6 is a circuit diagram of an analog PWM driven pixel based on a data driving circuit integrated with a scan comparator.
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, rather than all embodiments, and all other embodiments obtained by a person skilled in the art without making creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
Referring to fig. 3-6, an analog PWM driving circuit for Micro LED includes:
data-driven integrated scannerA scan comparison unit for driving the scan integration comparison unit to pass through the data signal line S [ N ] when data is written into a sub-frame]Providing a gray scale voltage signal V Data of A pixel section; and can pass through the data signal line S [ N ] when the sub-frame is scanned by emitting light]Output data scanning comparison voltage V Scanning To the pixel section.
Providing a-bit gray scale voltage signal V when data is written into the sub-frame Data of For the pixel part, the a-bit gray scale voltage signal can be written into the pixel storage voltage P [ MN ] of each pixel part]And points, wherein m is the row number of the pixels, and n is the column number of the pixels, are used for determining the light emitting time of the light emitting diode corresponding to the sub-pixel.
Outputting a data scanning comparison voltage V with c = a + b bits when a subframe is scanned by light emission Scanning As a reference voltage to the pixel portion.
Specifically, as shown in fig. 4, the data driving integration scan comparing unit includes a set of data output stages, a set of c = a + b bit reference voltages, a set of digital-to-analog converters DAC, a shift register and a counter; the output ends of the counter and the shift register are connected with the input end of a digital-to-analog converter DAC, and the output end of the digital-to-analog converter DAC is connected with a data output stage; the shift register is used for receiving digital pixel data Din at the front end when data are written into a subframe; the counter is based on a scan enable signal S when emitting light to scan the sub-frame EN Sequentially outputting 0-2 c-1 A digital signal; the digital-analog converter DAC receives the digital pixel data Din when data are written into a subframe, and converts the digital pixel data Din into analog pixel data; the DAC receives the 0-2 during the light-emitting scanning sub-frame c-1 Order digital signal, and will be 0-2 c -1 The order digital signal is converted into an analog signal; the data output stage receives the analog pixel data and outputs an a-bit gray scale voltage signal V when data is written into a sub-frame Data of Outputting a c = a + b bit data voltage V based on the analog signal at the time of light emission scanning sub-frame Scanning As a reference voltage.
As shown in fig. 6, the pixel portion circuit includes a switching tube T2 and a driving tube T3, a source of the switching tube T2 is connected to a gate of the driving tube T3, a drain of the switching tube T2 is connected to an output terminal of a first transmission gate TG1, a gate of the switching tube T2 receives a scan driving signal G [ M ], a drain of the driving tube T3 is connected to an anode of a light emitting diode, a cathode of the light emitting diode is grounded, a source of the driving tube T3 is connected to a power supply voltage or is connected to the power supply voltage through a transistor T1, a source of the switching tube T2 is connected to the driving tube T3 through a lead and has a pixel storage voltage point P [ MN ] on the lead, and the point P [ MN ] is connected to a second transmission gate TG2 through a capacitor C.
As shown in fig. 6, further includes a scan driving part providing a control signal F M]According to a control signal F [ M ]]Opening the first transmission gate TG1 to accept the data line S [ N ] in the data write sub-frame]Data voltage V of Data of And opening the second transmission gate TG2 to receive the data signal line S [ N ] during the light-emitting scanning sub-frame]Scanning comparison voltage V Scanning (ii) a The control ends of the first transmission gate TG1 and the second transmission gate TG2 are connected with a control signal F [ M ]]The input ends of the first transmission gate TG1 and the second transmission gate TG2 receive a data line S [ N ]]Of the signal of (a).
The switch tube T2 and the driving tube T3 are PMOS transistors, and when the data writing sub-frame is finished, the pixel storage voltage point P [ MN ] of each pixel portion is completely written so as not to affect the light-emitting scanning sub-frame and the light-emitting scanning thereof.
When scanning the comparison voltage V Scanning When the voltage is raised, the scanning comparison voltage V is converted into the voltage through the capacitor C Scanning Coupled to a pixel storage voltage P [ MN]Point, so that the coupled pixel voltage is P [ MN ]]’=P[MN]+a* V Scanning (t), wherein a is a coupling weight.
The analog PWM driving is an analog PWM driving circuit, has a working principle similar to that of PWM driving, and can be suitable for driving Micro LEDs.
The invention saves a scanning driving part, reduces the area of the IC, reduces the power consumption of the IC, simultaneously sets the data voltage and the scanning comparison voltage to share the same group of reference voltage, improves the voltage matching, reduces the scanning fan-out routing of the original scanning line and simplifies the whole chip line.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. An analog PWM drive circuit for a Micro LED, comprising:
a data driving integration scanning comparison part capable of passing through the data signal line S [ N ] when data is written into the sub-frame]Providing a gray scale voltage signal V Data of A pixel section; and can pass through data signal line S [ N ] when emitting light to scan sub-frame]Output data scan comparison voltage V Scanning A pixel section;
the data driving, integrating, scanning and comparing part comprises a group of data output stages, a group of c = a + b bit reference voltages, a group of digital-to-analog converters (DAC), a shift register and a counter; the output ends of the counter and the shift register are connected with the input end of a digital-to-analog converter DAC, and the output end of the digital-to-analog converter DAC is connected with a data output stage;
the shift register is used for receiving digital pixel data Din at the front end when data are written into a subframe;
the counter is based on a scan enable signal S when emitting light to scan the sub-frame EN Sequentially outputting 0-2 c-1 An order digital signal;
the digital-analog converter DAC receives the digital pixel data Din when data are written into a subframe, and converts the digital pixel data Din into analog pixel data; the DAC receives the 0-2 during the light-emitting scanning sub-frame c-1 Order digital signal, and will be 0-2 c-1 The order digital signal is converted into an analog signal;
the data output stage receives the analog pixel data and outputs an a-bit gray scale voltage signal V when data is written into a sub-frame Data of Outputting a c = a + b bit data voltage V based on the analog signal at a light emission scanning sub-frame Scanning As a reference voltage.
2. The analog PWM driving circuit for Micro LED of claim 1, wherein an a-bit gray scale voltage signal V is provided during a data write sub-frame Data of A pixel section; outputting a data scanning comparison voltage V with c = a + b bits when a subframe is scanned by light emission Scanning As a reference voltage to the pixel portion.
3. The analog PWM driving circuit for Micro LED according to claim 1, comprising a pixel portion circuit, wherein the pixel portion circuit comprises a switch tube T2 and a driving tube T3, the source of the switch tube T2 is connected to the gate of the driving tube T3, the drain of the switch tube T2 is connected to the output terminal of the first transmission gate TG1, the gate of the switch tube T2 receives the scan driving signal G [ M ], the drain of the driving tube T3 is connected to the anode of the light emitting diode, the cathode of the light emitting diode is grounded, the source of the driving tube T3 is connected to the power supply voltage or to the power supply voltage through the transistor T1, the source of the switch tube T2 is connected to the driving tube T3 through a lead and has a pixel storage voltage point P [ MN ] on the lead, and the point P [ MN ] is connected to the second transmission gate TG2 through a capacitor C.
4. The analog PWM drive circuit for Micro LED of claim 3, further comprising a scan drive section providing a control signal F [ M ]]According to a control signal F [ M ]]Opening the first transmission gate TG1 to receive the data line S [ N ] in the data writing sub-frame]Data voltage V of Data of And opening the second transmission gate TG2 to receive the data signal line S [ N ] during the light-emitting scanning sub-frame]Scanning comparison voltage V Scanning 。
5. The analog PWM driving circuit for Micro LED according to claim 3, wherein the switch transistor T2 and the driving transistor T3 are PMOS transistors.
6. The analog PWM driving circuit for Micro LED according to claim 1, wherein at the end of the data writing sub-frame, the pixel storage voltage point P [ MN ] of each pixel portion is written.
7. The analog PWM drive circuit for Micro LED of claim 1, wherein when scanned the comparison voltage V Scanning When the voltage is raised, the scanning comparison voltage V is converted into the voltage through the capacitor C Scanning Coupled to a pixel storage voltage P [ MN]Point, so that the coupled pixel voltage is P [ MN ]]’=P[MN]+a* V Scanning (t), wherein a is a coupling weight.
8. The analog PWM drive circuit for a Micro LED of claim 1, wherein the analog PWM drive is an analog PWM drive for driving a Micro LED.
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| CN202211141427.4A CN115243424B (en) | 2022-09-20 | 2022-09-20 | Analog PWM (pulse width modulation) driving circuit for Micro LED |
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| CN115953984B (en) * | 2023-03-10 | 2023-07-07 | 禹创半导体(深圳)有限公司 | Display control circuit and display system |
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| CN103928010A (en) * | 2014-05-04 | 2014-07-16 | 深圳市华星光电技术有限公司 | Data driving circuit for driving liquid crystal display panel and driving method of liquid crystal display panel |
| CN104505022B (en) * | 2014-12-16 | 2017-10-10 | 广东威创视讯科技股份有限公司 | A kind of indoor LED display driving method of high density and LED driver |
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| CN106910463A (en) * | 2017-04-28 | 2017-06-30 | 深圳市华星光电技术有限公司 | A kind of AMOLED drive circuits and display device |
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