CN111369932B - Driving method and driving circuit of display device - Google Patents
Driving method and driving circuit of display device Download PDFInfo
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- CN111369932B CN111369932B CN201811578585.XA CN201811578585A CN111369932B CN 111369932 B CN111369932 B CN 111369932B CN 201811578585 A CN201811578585 A CN 201811578585A CN 111369932 B CN111369932 B CN 111369932B
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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]
Abstract
The invention provides a driving method and a driving circuit of a display device, wherein N driving current generation sub-circuits are arranged in a driving current generation circuit, and the gating work of a first gating switch, a second gating switch and a third gating switch in the driving current generation sub-circuits is set through a control instruction, when M (M is less than or equal to N) driving current generation sub-circuits are switched on to work, the driving current output of the whole driving circuit is M times of the reference current generated by a reference current generation circuit, so that the purpose of independently adjusting the driving current of a specific driving port through the control instruction is achieved. In addition, MOS tubes in the driving circuit work in a linear region, so that the working voltage of the driving circuit is reduced, and the driving efficiency is improved.
Description
Technical Field
The invention relates to the field of circuits, in particular to a linear constant current integrated driving circuit for controlling the brightness of an LED (Light Emitting Diode) display unit through a driving circuit.
Background
With the continuous progress of electronic equipment and the coming of the information era, information display equipment in various forms is applied to various industries, wherein LED display equipment is applied to markets, hospitals, banks, roads, stations, airports, stock exchanges and the like and various large-scale activity places, and people can receive prompt information or industry information through different LED display equipment.
The LED in the LED display device belongs to a semiconductor device with sensitive characteristics, the brightness of the LED is related to the driving current, stable current and corresponding state protection equipment are required for stable work of the LED, and a constant current driving chip is just a device for realizing the functions. The conventional LED constant current driving chip (IC) can adjust the magnitude of the driving current through the adjustment of an off-chip resistor or an analog-to-digital converter, but cannot adjust the current of a specific driving port of a plurality of driving ports of the driving chip individually, so that the brightness of a certain LED cannot be adjusted individually. In addition, because the MOS tube in the traditional LED constant current driving chip works in a saturation region, the problems of high voltage drop, high working voltage and low efficiency in the chip are prominent.
Disclosure of Invention
In view of this, the present invention provides a linear constant current driving method and a linear constant current driving circuit for a display device, and aims to solve the problems that the brightness of a certain display unit cannot be independently adjusted by the conventional driving chip, and the chip has high working voltage and low efficiency.
A driving method of a display device, characterized by: the method comprises the steps that N driving current generation sub-circuits capable of generating driving currents with the same magnitude as the currents in a reference current generation circuit are arranged to form a driving current generation circuit, each driving current generation sub-circuit is connected with the reference current generation circuit through a gating switch contained in the driving current generation sub-circuit, and the driving current generated by each driving current generation sub-circuit is output to a driving output end of the driving current generation circuit; when each of the M (M is less than or equal to N) drive current generation sub-circuits is set to be in a connection state with the reference current generation circuit by a control instruction, the magnitude of the output current of the drive output end of the drive current generation circuit is M times of the magnitude of the reference current generated by the reference current generation circuit.
Further, the driving current generation sub-circuit comprises two MOS tubes and works in a linear region.
Furthermore, the driving current generation sub-circuit comprises three gating switches which are respectively a first gating switch, a second gating switch and a third gating switch, and the gating connection of the input end of each gating switch is controlled by a control instruction.
Further, the gating connections at the input end of the gating switch are controlled by control commands specifically as follows: when the control instruction is '111', the input ends of the first gating switch, the second gating switch and the third gating switch are all connected with the corresponding ports of the reference current generating circuit, and at the moment, the driving current generating sub-circuit and the reference current generating circuit are considered to be in a gating connection state; when the control command is '000', the input ends of the first gating switch, the second gating switch and the third gating switch are all selected to be connected with a regulated power supply VDD, and the driving current generation sub-circuit does not generate driving current at the moment.
Further, the control instruction may set a gate switch of each of the N drive current generation sub-circuits.
Further, the reference current generation circuit is used for generating a reference current of the magnitude of the driving current to be generated when only one driving current generation sub-circuit is in a gating state.
Furthermore, the number N of the drive current generation sub-circuits is a value selected according to design requirements when the drive circuit is designed, and the number of the drive current generation sub-circuits in the drive circuit is immediately determined after N is selected; and the display device is an LED.
In another aspect, the present invention provides a driving circuit of a display device, including: the driving current generating circuit comprises a first voltage follower and N identical driving current generating sub-circuits, wherein each driving current generating sub-circuit comprises a first MOS (metal oxide semiconductor) tube, a second MOS tube, a first gating switch, a second gating switch and a third gating switch;
the grid electrode of the first MOS tube is connected with the output end of the first gating switch, the source electrode of the first MOS tube is connected with a voltage-stabilized power supply VDD, the drain electrode of the first MOS tube is connected with the source electrode of the second MOS tube, the connecting point is connected with the output end of the second gating switch, the grid electrode of the second MOS tube is connected with the output end of the third gating switch, and the drain electrode of the second MOS tube outputs the driving current of the driving current generation sub-circuit; the input end of the first gating switch is in gating connection between a first reference voltage generated by the reference current generating circuit and a stabilized voltage power supply VDD, the input end of the second gating switch is in gating connection between the reverse input end of the first voltage follower and the stabilized voltage power supply VDD, the input end of the third gating switch is in gating connection between the output end of the first voltage follower and the stabilized voltage power supply VDD, and the positive input end of the first voltage follower is connected with a second reference voltage generated by the reference current generating circuit.
Furthermore, the first MOS tube and the second MOS tube work in a linear region.
Furthermore, the gating connection of the input ends of the first gating switch, the second gating switch and the third gating switch is controlled by the instruction of the register.
Further, the gating connections at the input end of the gating switch are controlled by control commands specifically as follows: when the control instruction is '111', the input ends of the first gating switch, the second gating switch and the third gating switch are all connected with the corresponding ports of the reference current generating circuit, and at the moment, the driving current generating sub-circuit and the reference current generating circuit are considered to be in a gating connection state; when the control command is '000', the input ends of the first gating switch, the second gating switch and the third gating switch are all selected to be connected with a regulated power supply VDD, and the driving current generation sub-circuit does not generate driving current at the moment.
Further, the control instruction may set the gate switch of each of the N drive current generation sub-circuits.
Further, the reference current generation circuit is used for generating a reference current of the magnitude of the driving current to be generated when each driving current generation sub-circuit is in a gating state.
Furthermore, the number N of the driving current generating sub-circuits is a value selected according to design requirements when the driving circuit is designed, and the number of the driving current generating sub-circuits in the driving circuit is determined immediately after N is selected.
Further, the first voltage follower is an operational amplifier.
The invention has the beneficial effects that: the invention provides a driving method and a driving circuit of a display device, wherein N driving current generation sub-circuits are arranged in a driving current generation circuit, and the gating work of a first gating switch, a second gating switch and a third gating switch in the driving current generation sub-circuits is set through a control instruction, when M (M is less than or equal to N) driving current generation sub-circuits are switched on to work, the driving current output of the whole driving circuit is M times of the reference current generated by a reference current generation circuit, so that the effects of independently adjusting the driving current of a specific driving port through the control instruction, reducing the internal voltage drop of a chip, improving the utilization efficiency of a power supply and greatly reducing the working voltage of the chip are achieved.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention in the prior art, the drawings needed to be used in the description of the embodiments or prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a driving circuit diagram of a conventional LED driver in the prior art;
FIG. 2A is a circuit diagram of a common cathode connected LED driver according to a first embodiment of the present invention;
FIG. 2B is a circuit diagram of a driving module according to a first embodiment of the present invention;
FIG. 3A is a circuit diagram of an improved common anode connected LED driver circuit provided by a second embodiment of the present invention;
FIG. 3B is a circuit diagram of a driving module according to a second embodiment of the present invention.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. Embodiments of the invention may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed.
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings.
Fig. 1 shows a driving circuit of a conventional constant current type LED driver, where fig. 1A is an LED common cathode connection method, and fig. 1B is an LED common anode connection method. The driving unit for driving one LED is arranged in the dashed line frame, and for driving other LEDs, the driving unit in the dashed line frame is copied and port parts connected with the MOS tubes M1 and M2 are connected in parallel. If the circuit is used for LED large-screen driving, the current of each LED cannot be independently adjusted, and all display units can be adjusted together only through a digital-to-analog converter (DAC) of Nbit; in addition, the voltage drop inside the chip is Vgs + Vds + Vsw, where Vgs is the gate-source voltage of M3 or M6 (which varies according to the magnitude of the output driving current and is not a constant value), vds is the drain-source voltage of M4 or M7, and Vsw is the pulse width modulation switching voltage, when the MOS transistors M3, M4, M6, and M7 operate in the saturation region, the voltage drop inside the chip is large, which results in high chip operating voltage, large heat generation, and large efficiency loss of the LED driver, which affects the system performance and life.
Example one
Referring to fig. 2A and 2B, a schematic diagram of a common cathode LED driving circuit includes:
the driving current generating circuit comprises a first voltage follower OP1 and N identical driving current generating sub-circuits, wherein each driving current generating sub-circuit comprises a first MOS (metal oxide semiconductor) tube M1, a second MOS tube M2, a first gating switch X1, a second gating switch X2 and a third gating switch X3;
the grid electrode of the first MOS tube M1 is connected with the output end of the first gating switch X1, the source electrode of the first MOS tube M1 is connected with a voltage-stabilized power supply VDD, the drain electrode of the first MOS tube M1 is connected with the source electrode of the second MOS tube M2, the connecting point is connected with the output end of the second gating switch X2, the grid electrode of the second MOS tube M2 is connected with the output end of the third gating switch X3, and the drain electrode of the second MOS tube M2 outputs the driving current of the driving current generation sub-circuit where the second MOS tube M2 is located; the input end of the first gating switch X1 is in gating connection between a first reference voltage Vbp1 generated by the reference current generating circuit and a regulated power supply VDD, the input end of the second gating switch X2 is in gating connection between the reverse input end of the first voltage follower OP1 and the regulated power supply VDD, the input end of the third gating switch X3 is in gating connection between the output end of the first voltage follower OP1 and the regulated power supply VDD, and the forward input end of the first voltage follower OP1 is connected with a second reference voltage Vbp2 generated by the reference current generating circuit.
Further, the first MOS transistor M1 and the second MOS transistor M2 both work in a linear region.
Furthermore, the gating connection of the input ends of the first gating switch X1, the second gating switch X2 and the third gating switch X3 is controlled by a control instruction.
Further, the gating connections at the input end of the gating switch are controlled by the control instruction specifically as follows: when the control instruction is "111", the input ends of the first gate switch X1, the second gate switch X2 and the third gate switch X3 are all connected with the corresponding port of the reference current generating circuit or the port of the first voltage follower (such as the inverted input end and the output end of Vbp1, vbp2 and OP 1), and at this time, the driving current generating sub-circuit and the reference current generating circuit are considered to be in a gate connection state; when the control instruction is '000', the input ends of the first gating switch, the second gating switch and the third gating switch are all selected to be connected with a voltage-stabilized power supply VDD, and at the moment, the driving current generation sub-circuit does not generate driving current; in addition, if it is necessary to gate a plurality of driving current generating sub-circuits, different control instruction forms may be used to send the control instruction, such as sending the instruction to the gate switch of each driving current generating sub-circuit in turn, or customizing the relevant instruction format, which is not limited herein.
Further, the control instruction may set the gate switch of each of the N drive current generation sub-circuits.
Further, the reference current generating circuit is configured to generate a reference current of a magnitude of the driving current generated when each driving current generating sub-circuit is in a gating state, and a specific form of the reference current generating circuit is not limited herein, and a person skilled in the art can flexibly design the reference current according to actual needs.
Furthermore, the number N of the driving current generation sub-circuits is a value selected according to design requirements when the driving circuit is designed, for example, a number of 2 powers such as 4, 8, 16 can be selected, so that the coding instruction can conveniently address each different driving current generation sub-circuit and code the gating switch; after N is selected, the number of the drive current generation sub-circuits in the drive circuit is determined immediately, the drive current generation sub-circuits are solidified into the integrated chip in the actual design, and the number of the drive current generation sub-circuits required to be used can be selected according to needs in different specific application scenes, instead of the situation that the drive chip comprising the N drive current generation sub-circuits can only be used in a certain specific scene.
Further, the first voltage follower is an operational amplifier.
The reference current generating circuit mainly generates a reference current of the magnitude of the driving current generated by each driving current generating sub-circuit, as shown in a portion outside a dashed line frame in fig. 2A, and "mirrors" the generated reference current to each driving current generating sub-circuit through a voltage follower, that is, an operational amplifier, where the specific connection relationship and the selection of devices are as shown in fig. 2A, and of course, the reference current generating circuit can also be flexibly selected as needed, which is well known by those skilled in the art, and is not described herein again.
Example two
Referring to fig. 3A and 3B, a schematic diagram of a common-anode LED driving circuit includes: the driving circuit comprises a reference current generating circuit (outside a dashed line frame in fig. 3A) and a driving current generating circuit (outside a dashed line frame in fig. 3A), wherein the driving current generating circuit comprises a first voltage follower OP1 and N identical driving current generating sub-circuits, and each driving current generating sub-circuit comprises a first MOS transistor M1, a second MOS transistor M2, a first gating switch X1, a second gating switch X2 and a third gating switch X3;
the grid electrode of the first MOS tube M1 is connected with the output end of the first gating switch X1, the source electrode of the first MOS tube is connected with the ground, the drain electrode of the first MOS tube M1 is connected with the source electrode of the second MOS tube M2, the connecting point is connected with the output end of the second gating switch X2, the grid electrode of the second MOS tube M2 is connected with the output end of the third gating switch X3, and the drain electrode of the second MOS tube M2 outputs the driving current of the driving current generation sub-circuit (the current flows to the drain electrode of the M2 from an LED outside a chip); the input end of the first gating switch X1 is in gating connection between a first reference voltage Vbn1 generated by the reference current generating circuit and a ground terminal, the input end of the second gating switch X2 is in gating connection between the reverse input end of the first voltage follower OP1 and the ground terminal, the input end of the third gating switch X3 is in gating connection between the output end of the first voltage follower OP1 and the ground terminal, and the forward input end of the first voltage follower OP1 is connected with a second reference voltage Vbn2 generated by the reference current generating circuit.
Furthermore, the first MOS transistor M1 and the second MOS transistor M2 both work in a linear region.
Furthermore, the gating connection of the input ends of the first gating switch X1, the second gating switch X2 and the third gating switch X3 is controlled by a control instruction.
Further, the gating connections at the input end of the gating switch are controlled by control commands specifically as follows: when the control command is '111', the input ends of the first gate switch X1, the second gate switch X2 and the third gate switch X3 are all connected with the reference current generating circuit and the corresponding ports (such as the inverted input ends and the output ends of Vbn1, vbn2 and OP 1) of the first voltage follower OP1, and at this time, the driving current generating sub-circuit and the reference current generating circuit are considered to be in a gate connection state; when the control instruction is '000', the input ends of the first gate switch X1, the second gate switch X2 and the third gate switch X3 are all selected to be connected with the grounding end, and the driving current generating sub-circuit does not generate driving current at the moment; in addition, if it is necessary to gate a plurality of driving current generating sub-circuits, different control instruction forms may be used to send the control instruction, such as sending the instruction to the gate switch of each driving current generating sub-circuit in turn, or customizing the relevant instruction format, which is not limited herein.
Further, the control instruction may set a gate switch of each of the N drive current generation sub-circuits.
Further, the reference current generating circuit is configured to generate a reference current of a magnitude of the driving current generated when each driving current generating sub-circuit is in a gating state, and a specific form of the reference current generating circuit is not limited herein, and a person skilled in the art can flexibly design the reference current according to actual needs.
Furthermore, the number N of the driving current generation sub-circuits is a value selected according to design requirements when the driving circuit is designed, for example, a number of 2 powers such as 4, 8, 16 can be selected, so that the coding instruction can conveniently address each different driving current generation sub-circuit and code the gating switch; after N is selected, the number of the drive current generation sub-circuits in the drive circuit is determined immediately, the drive current generation sub-circuits are solidified into the integrated chip in the actual design, and the number of the drive current generation sub-circuits required to be used can be selected according to needs in different specific application scenes, instead of the situation that the drive chip comprising the N drive current generation sub-circuits can only be used in a certain specific scene.
Further, the first voltage follower is an operational amplifier.
The reference current generating circuit, as shown in fig. 3A, is mainly configured to generate a reference current of a magnitude of a driving current to be generated by each driving current generating sub-circuit, and "mirror" the generated reference current to each driving current generating sub-circuit through a voltage follower, that is, an operational amplifier, where a specific connection relationship and a selection of a device are as shown in fig. 3, and may be flexibly selected as needed, which is well known by those skilled in the art and is not described herein again.
In addition, all the MOS transistors in fig. 2A and fig. 2B and fig. 3A and fig. 3B operate in a linear region, and the voltage drop Vds of the MOS transistor operating in the linear region may be very small, for example, may reach 100mV respectively, so that the voltage drop of the chip may reach about 200mV, which may be at least 500mV smaller than the Vds of the chip (0.18 μm process) with the conventional structure, thereby achieving the purpose of reducing the power consumption of the chip and improving the efficiency.
In addition, the display unit, such as the LED, is not directly driven after the driving current is generated, but the driving circuit generates the driving current and then is controlled by a pulse width modulation signal (PWM, such as the PWM shown in fig. 1), that is, the actual driving of the LED current is controlled by the magnitude of the driving current and the PWM control switch, but for convenience of description in the present invention, the PWM control switch is not shown in fig. 2A and 2B and fig. 3A and 3B.
The driving method and the driving circuit provided by the invention can be used for the circuit design in the related driving chip and can also be applied to a common driving circuit.
The disclosed embodiments are provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the scope or spirit of the invention. The above-described embodiments are merely preferred embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. A driving method of a display device, characterized in that:
the method comprises the steps that N driving current generation sub-circuits capable of generating driving currents with the same magnitude as the currents in a reference current generation circuit are arranged to form a driving current generation circuit, each driving current generation sub-circuit is connected with the reference current generation circuit through a gating switch contained in the driving current generation sub-circuit, and the driving current generated by each driving current generation sub-circuit is output to a driving output end of the driving current generation circuit; the driving current generation circuit comprises a first voltage follower and N identical driving current generation sub-circuits, wherein each driving current generation sub-circuit comprises a first MOS (metal oxide semiconductor) tube, a second MOS tube, a first gating switch, a second gating switch and a third gating switch; the gating connections of the input ends of the first gating switch X1, the second gating switch X2 and the third gating switch X3 are controlled by control instructions;
m is less than or equal to N, and when each of the M drive current generation sub-circuits is set to be in a connection state with the reference current generation circuit by a control instruction, the magnitude of the output current of the drive output end of the drive current generation circuit is M times of the magnitude of the reference current generated by the reference current generation circuit; the driving current generation sub-circuit comprises two MOS tubes, and the first MOS tube and the second MOS tube work in a linear region.
2. The method of claim 1, wherein:
the reference current generation circuit is used for generating a reference current with the size of the driving current to be generated when the single driving current generation sub-circuit is in a gating state.
3. The method of claim 2, wherein:
the display device is an LED, and the driving output end of the driving current generation circuit is connected with an LED display unit to be driven.
4. A drive circuit of a display device, comprising a reference current generation circuit and a drive current generation circuit, characterized in that:
the driving current generation circuit comprises a first voltage follower and N identical driving current generation sub-circuits, wherein each driving current generation sub-circuit comprises a first MOS (metal oxide semiconductor) tube, a second MOS tube, a first gating switch, a second gating switch and a third gating switch; the gating connection of the input ends of the first gating switch X1, the second gating switch X2 and the third gating switch X3 is controlled by a control instruction; the grid electrode of the first MOS tube is connected with the output end of a first gating switch, the source electrode of the first MOS tube is connected with a voltage-stabilized power supply VDD, the drain electrode of the first MOS tube is connected with the source electrode of the second MOS tube, the connecting point is connected with the output end of a second gating switch, the grid electrode of the second MOS tube is connected with the output end of a third gating switch, and the drain electrode of the second MOS tube outputs the driving current of the driving current generation sub-circuit where the second MOS tube is; the input end of the first gating switch is in gating connection between a first reference voltage generated by the reference current generating circuit and a regulated power supply VDD, the input end of the second gating switch is in gating connection between the reverse input end of the first voltage follower and the regulated power supply VDD, the input end of the third gating switch is in gating connection between the output end of the first voltage follower and the regulated power supply VDD, and the positive input end of the first voltage follower is connected with a second reference voltage generated by the reference current generating circuit;
m is less than or equal to N, and when each of the M drive current generation sub-circuits is set to be in a connection state with the reference current generation circuit by a control instruction, the magnitude of the output current of the drive output end of the drive current generation circuit is M times of the magnitude of the reference current generated by the reference current generation circuit;
the first MOS tube and the second MOS tube work in a linear region.
5. The drive circuit of claim 4, wherein:
the reference current generation circuit is used for generating a reference current with the size of the driving current to be generated when the single driving current generation sub-circuit is in a gating state.
6. The drive circuit of claim 4, wherein:
the display device is an LED, and the driving output end of the driving current generating circuit is connected with an LED display unit to be driven.
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1530914A (en) * | 2003-03-14 | 2004-09-22 | ���µ�����ҵ��ʽ���� | Current driver |
| CN102479488A (en) * | 2010-11-23 | 2012-05-30 | 三星电子株式会社 | Circuit and method of driving light emitting diodes, and light emitting diode system having the same |
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| CN111369932A (en) | 2020-07-03 |
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