CN117059020B - LED display screen driving circuit with low turning voltage and LED display screen - Google Patents
LED display screen driving circuit with low turning voltage and LED display screen Download PDFInfo
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- CN117059020B CN117059020B CN202311189126.3A CN202311189126A CN117059020B CN 117059020 B CN117059020 B CN 117059020B CN 202311189126 A CN202311189126 A CN 202311189126A CN 117059020 B CN117059020 B CN 117059020B
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- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000009123 feedback regulation Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
Classifications
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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]
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
Abstract
The application discloses LED display screen drive circuit of low turning voltage relates to an LED display screen drive circuit and LED display screen of low turning voltage, and it includes: the reference voltage generation module and the constant current output module; the reference voltage generation module is used for outputting a reference voltage and a reference voltage; the constant current output module comprises a reference current generation circuit and a driving circuit; the reference current generation circuit comprises a first operational amplifier, a second operational amplifier, a first MOS tube, a second MOS tube, a third MOS tube and a fourth MOS tube; the current mirror circuit composed of the N-type MOS transistors and the N-type MOS transistors can realize stable control of output current, reasonable voltage is set at the same time, turning voltage is reduced, part of output signals are subjected to sampling and feedback control, and the turning voltage is further reduced and stability is improved through adjustment of the operational amplifier.
Description
Technical Field
The application relates to the technical field of integrated circuits, in particular to an LED display screen driving circuit with low turning voltage and an LED display screen.
Background
The breakover voltage means that when the on-current increases to a certain extent in the semiconductor discharge tube, a sudden point occurs in the change of the voltage, at which point the on-voltage breaks over.
At present, an LED display screen is widely applied to various electronic devices, but has the problem of turning voltage in the voltage driving process. In the conventional voltage driving design, the breakover voltage is higher, resulting in lower power consumption efficiency, and also affects the display quality. The breakover voltage of the common constant current driving chip is 0.6V, and the constant current state can be ensured by using a 3.6V power supply at the minimum.
Therefore, in order to reduce the power consumption, the heat generation and the heat loss of the LED display screen without sacrificing the display effect, a new low breakover voltage design is needed to solve the above-mentioned problems.
Disclosure of Invention
The invention aims to avoid the defects in the prior art and provide a low turning voltage LED display screen driving technology.
The aim of the invention is achieved by the following technical scheme:
according to one aspect of the present application, there is provided an LED display screen driving circuit with a low breakover voltage, comprising: the reference voltage generation module and the constant current output module; the reference voltage generation module is used for outputting a reference voltage and a reference voltage; the constant current output module comprises a reference current generation circuit and a driving circuit; the reference current generation circuit comprises a first operational amplifier, a second operational amplifier, a first MOS tube, a second MOS tube, a third MOS tube and a fourth MOS tube; the non-inverting input end of the first operational amplifier is connected with a reference voltage, and the output end of the first operational amplifier is connected with the grid electrode of the first MOS tube; the negative phase input end of the second operational amplifier is connected with the reference voltage, and the output end of the second operational amplifier is connected with the grid electrode of the second MOS tube; the drain electrode of the third MOS tube is connected with the drain electrode of the first MOS tube, and the drain electrode of the fourth MOS tube is connected with the drain electrode of the second MOS tube; the third MOS tube and the fourth MOS tube form a first current mirror; the driving circuit comprises a third operational amplifier, a fifth MOS tube and a sixth MOS tube; the non-inverting input end of the third operational amplifier is connected with reference voltage, the output end of the third operational amplifier is connected with the grid electrode of the fifth MOS tube, the source electrode of the fifth MOS tube is connected with the drain electrode of the sixth MOS tube, and the second MOS tube and the sixth MOS tube form a second current mirror; the drain electrode of the fifth MOS tube is connected with the output end of the driving circuit and is used for outputting driving voltage.
Specifically, the driving circuit further comprises a seventh MOS tube; the grid electrode of the seventh MOS tube is used for accessing an enabling signal, and the drain electrode of the seventh MOS tube is connected with the drain electrode of the fifth MOS tube; the input of the third operational amplifier is also connected with an enable signal.
More specifically, the power supply module is also connected with the reference voltage generating module and the constant current output module respectively, and outputs working voltage to the reference voltage generating module and the constant current output module respectively; the sources of the third MOS tube, the fourth MOS tube and the seventh MOS tube are all connected with working voltage.
More specifically, the reference current generating circuit further comprises a feedback resistor, one end of the feedback resistor is grounded, and the other end of the feedback resistor is connected with the negative phase input end of the first operational amplifier and the source electrode of the first MOS tube.
More specifically, the first MOS transistor, the second MOS transistor, the fifth MOS transistor, and the sixth MOS transistor all adopt N-type MOS transistors.
More specifically, the third MOS tube, the fourth MOS tube and the seventh MOS tube all adopt P-type MOS tubes.
The reference voltage generating module comprises a band gap reference circuit and a reference voltage generating circuit, wherein the output end of the band gap reference circuit is connected with the reference voltage generating circuit to provide a reference voltage for the reference voltage generating circuit.
Further, the reference voltage generating circuit comprises a fourth operational amplifier and an eighth MOS tube; the positive input end of the fourth operational amplifier is connected with the reference voltage, the output end of the fourth operational amplifier is connected with the grid electrode of the eighth MOS tube, and the negative input end of the fourth operational amplifier is connected with the source electrode of the eighth MOS tube; the source electrode of the eighth MOS tube is connected with the output end of the reference voltage generating circuit.
Further, the reference voltage generating circuit further comprises a first resistor and a second resistor; the source electrode of the eighth MOS tube is connected with the output end of the reference voltage generating circuit through a first resistor; one end of the second resistor is connected with the output end of the reference voltage generating circuit, and the other end of the second resistor is grounded.
According to another aspect of the present application, there is also provided an LED display screen, which includes the LED display screen driving circuit with a low breakover voltage.
The invention has the beneficial effects that: the application discloses LED display screen drive circuit of low breakover voltage includes: the reference voltage generation module and the constant current output module; the reference voltage generation module is used for outputting a reference voltage and a reference voltage; the constant current output module comprises a reference current generation circuit and a driving circuit; the reference current generation circuit comprises a first operational amplifier, a second operational amplifier, a first MOS tube, a second MOS tube, a third MOS tube and a fourth MOS tube; the current mirror circuit composed of the N-type MOS transistors and the N-type MOS transistors can realize stable control of output current, reasonable voltage is set at the same time, turning voltage is reduced, part of output signals are subjected to sampling and feedback control, and the turning voltage is further reduced and stability is improved through adjustment of the operational amplifier.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic block diagram of an LED display driving circuit with low breakover voltage and an LED display according to an embodiment of the present application;
fig. 2 is a schematic circuit diagram of a reference voltage generating module of an LED display driving circuit with low breakover voltage according to an embodiment of the present application;
fig. 3 is a schematic circuit diagram of a constant current output module of an LED display screen driving circuit with low breakover voltage according to an embodiment of the present application;
the fig. 3 includes:
101. a reference current generation circuit; 102. and a driving circuit.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the present application more clear, the technical solutions of the present application will be clearly and completely described by implementation with reference to the accompanying drawings in the examples of the present application, and it is apparent that the described examples are some, but not all, examples of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Example 1
One implementation method of the LED display screen of the present application, as shown in fig. 1 to 3, includes: the LED display screen driving circuit with low turning voltage comprises an LED display screen driving circuit with low turning voltage, a power supply module and an LED module consisting of a plurality of LEDs. The power module is used for supplying power to an LED display screen driving circuit with low turning voltage, and the LED display screen driving circuit with low turning voltage is used for controlling the on-off of LEDs, namely, driving the LED module.
Specifically, a low breakover voltage's LED display screen drive circuit includes: the reference voltage generation module and the constant current output module; the power supply module is respectively connected with the reference voltage generation module and the constant current output module and respectively outputs working voltage VDD to the reference voltage generation module and the constant current output module.
The reference voltage generation module comprises a band gap reference circuit (i.e. a band gap circuit) and a reference voltage generation circuit, wherein the output end of the band gap reference circuit is connected with the reference voltage generation circuit to provide a reference voltage Vbg for the reference voltage generation circuit, and the reference voltage generation circuit is used for outputting a reference voltage Vref.
The constant current output module includes a reference current generation circuit 101 and a drive circuit 102. The bandgap reference circuit is further configured to provide a reference voltage Vbg for the reference current generating circuit 101, and the reference voltage generating circuit is further configured to provide a post-reference voltage Vref for the reference current generating circuit 101 and the driving circuit 102.
In this embodiment, as shown in fig. 2, the reference voltage generating circuit includes a fourth operational amplifier OP, an eighth MOS transistor NMOS (N-type MOS transistor), a first resistor R1, and a second resistor R2. The positive-phase input end of the fourth operational amplifier OP is connected with the reference voltage Vbg, the output end of the fourth operational amplifier OP is connected with the grid electrode of the eighth MOS tube NMOS, and the negative-phase input end of the fourth operational amplifier OP is connected with the source electrode of the eighth MOS tube NMOS; the source electrode of the eighth MOS tube NMOS is connected with the output end (namely the Vref output end) of the reference voltage generating circuit through a first resistor R1, and the drain electrode is connected with the working voltage VDD; one end of the second resistor R2 is connected with the output end of the reference voltage generating circuit, and the other end of the second resistor R2 is grounded.
Wherein the bandgap reference circuit utilizes the temperature effect on the bandgap of the semiconductor material by combining the characteristics of a Positive Temperature Coefficient (PTC) and a Negative Temperature Coefficient (NTC) to generate a temperature compensated reference voltage Vbg. The reference voltage remains relatively stable, about 1.2V, even if the ambient temperature changes. Under the condition that the resistance ratio of the first resistor R1 to the second resistor R2 is set to be 1:1, the output voltage of the Vref end is 0.6V, and if the resistance ratio is set to be 1:11, the voltage of the Vref end is 0.1V, the voltage value of the required reference voltage Vref can be modified according to the resistance ratio.
More specifically, as shown in fig. 3, the reference current generation circuit 101 includes a first operational amplifier OP1, a second operational amplifier OP2, a first MOS transistor NM1, a second MOS transistor NM2, a third MOS transistor PM1, a fourth MOS transistor PM2, and a feedback resistor Rext. The driving circuit 102 includes a third operational amplifier OP3, a fifth MOS transistor NM4, a sixth MOS transistor NM3, and a seventh MOS transistor PM3; the first MOS tube NM1, the second MOS tube NM2, the fifth MOS tube NM4 and the sixth MOS tube NM3 all adopt N-type MOS tubes. The third MOS tube PM1, the fourth MOS tube PM2 and the seventh MOS tube PM3 are all P-type MOS tubes.
The positive phase input end of the first operational amplifier OP1 is connected with the reference voltage Vbg, the output end of the first operational amplifier OP1 is connected with the grid electrode of the first MOS tube NM1, the negative phase input end of the first operational amplifier OP1 is connected with the source electrode of the first MOS tube NM1, the source electrode of the first MOS tube NM1 is grounded through a feedback resistor Rext, and the drain electrode of the first operational amplifier NM1 is connected with the drain electrode of the third MOS tube PM 1. The gate and drain of the third MOS tube PM1 are short-circuited together, and the source is connected with the working voltage VDD to form a negative feedback circuit.
The negative feedback circuit feeds back the reference current in real time by a feedback resistor Rext. The reference current calculation method comprises the following steps: reference current i=reference voltage Vref/feedback resistor Rext. According to the principle of 'virtual short' of the operational amplifier, namely the voltages of the positive and negative phase input pins (Vin+, vin-) of the first operational amplifier OP1 are equal. Initially, the output of the first operational amplifier OP1 will generate a control signal according to the setting of the reference voltage Vref. This signal passes through the voltage difference between the gate and the source of the first MOS transistor NM1, and controls the on and off of the first MOS transistor NM 1. When the first MOS transistor NM1 is turned on, the current flowing through the feedback resistor Rext is controlled and is approximately equal to the reference voltage Vref divided by the resistance value, and a constant current is formed. By feeding back the control signal, the first operational amplifier OP1 adjusts the operating point of the first MOS transistor NM1 according to the on or off state, thereby maintaining a constant current flowing through the feedback resistor Rext. Thus, when the stable reference voltage Vbg is input to the pin vin+ of the first operational amplifier OP1, the voltage across the resistor Rext is also Vbg, how the external circuit changes, and the current flowing through the resistor Rext is unchanged, so that a stable constant current circuit is formed by the synergistic effect of the first operational amplifier OP1, the first MOS transistor NM1 and the feedback resistor Rext.
More specifically, the negative phase input end of the second operational amplifier OP2 is connected to the reference voltage Vref, the output end is connected to the gate of the second MOS transistor NM2, the positive phase input end is connected to the drain of the second MOS transistor NM2, and the source of the second MOS transistor NM2 is grounded. The source electrode of the fourth MOS tube PM2 is connected with the working voltage VDD, the drain electrode is connected with the drain electrode of the second MOS tube NM2, and the grid electrode is connected with the grid electrode of the third MOS tube PM 1.
The input end of the third operational amplifier OP3 is also connected with an enable signal EN, the positive phase input end is connected with a reference voltage Vref, the output end is connected with the grid electrode of the fifth MOS tube NM4, and the negative phase input end is connected with the source electrode of the fifth MOS tube NM 4; the drain electrode of the fifth MOS tube is connected with the output end OUT of the driving circuit 102, the source electrode of the fifth MOS tube is connected with the drain electrode of the sixth MOS tube NM3, the source electrode of the sixth MOS tube NM3 is grounded, and the grid electrode of the sixth MOS tube NM3 is connected with the grid electrode of the second MOS tube NM 2; the gate of the seventh MOS tube PM3 is used for accessing the enable signal EN, the sources are all accessed to the working voltage VDD, and the drain is connected with the drain of the fifth MOS tube NM 4.
The feedback resistor Rext and the internal reference voltage Vref generate a reference current I, the voltage at the point a is equal to Vbg due to the "virtual short" characteristic of the operational amplifier OP1, and then the third MOS tube PM1 and the fourth MOS tube PM2 form a first current mirror. The first current mirror is used for obtaining an output current or voltage almost equal to the input current or voltage by adjusting a corresponding working point, wherein the current can be set to be 1 according to the chip design requirement: 1 or 1: n is output in a mode of n. Similarly, the second operational amplifier OP2 equalizes the voltage at the point B with Vref, the second current mirror is formed by the second MOS transistor NM2 and the sixth MOS transistor NM3, the second current mirror works in a similar manner, the current is transferred to the output circuit module, the third operational amplifier OP3 equalizes the voltage at the point C with Vref, wherein the voltage at the point C is a turning voltage, the voltage at the output terminal OUT is also low because the turning voltage is low, and finally the output terminal OUT generates a constant current to be output to the cathode of the LED.
Finally, the LED module is connected to the output terminal OUT, and the LED (LED module) is driven by the driving voltage supplied from the driving circuit 102.
In the LED display screen driving circuit with low turning voltage, an output signal of an operational amplifier is stably controlled through a current mirror circuit and is output to an LED display screen. And part of output signals are subjected to feedback regulation, sampling and operational amplifier control so as to further reduce turning voltage. The circuit structure designs of the current mirror and the like composed of the operational amplifier, the N-type MOS tube and the P-type MOS tube have the following remarkable effects:
(1) Energy saving: LED displays are typically composed of a large number of LEDs, and low breakover voltage designs can achieve low power driving. By reducing the driving voltage, the overall power consumption of the display screen can be reduced, and the energy utilization efficiency can be improved.
(2) Thermal management: lower breakover voltages may result in reduced heating of the driver chip and the LED. This helps to reduce the temperature of the display screen and reduces the burden of thermal management. By reducing the temperature, the reliability and lifetime of the display can be improved.
(3) The driver selection range expands: the design of low breakover voltage can make the selection range of the driving chip wider. Some driver chips may have lower operating voltage requirements, so the use of a low breakover voltage design may better meet the requirements of a particular driver chip.
(4) And (3) current precision control: the low breakover voltage design may enable more accurate current control. The brightness of an LED is typically controlled by current, and a lower breakover voltage can provide a more stable, more accurate current output, thereby achieving more accurate brightness control.
In summary, the low breakover voltage design has many benefits in LED display driving, including energy saving, thermal management, expanding driver selection range, and better current accuracy control. These advantages help to improve the performance and reliability of the display.
Note that the above is only a preferred embodiment of the present application and the technical principle applied. Those skilled in the art will appreciate that the present application is not limited to the particular embodiments described herein, but is capable of numerous obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the present application. Therefore, while the present application has been described in connection with the above embodiments, the present application is not limited to the above embodiments, but may include many other equivalent embodiments without departing from the spirit of the present application, the scope of which is defined by the scope of the appended claims.
Claims (9)
1. The utility model provides a LED display screen drive circuit of low breakover voltage which characterized in that includes: the reference voltage generation module and the constant current output module;
the reference voltage generation module is used for outputting a reference voltage and a reference voltage;
the constant current output module comprises a reference current generation circuit and a driving circuit;
the reference current generation circuit comprises a first operational amplifier, a second operational amplifier, a first MOS tube, a second MOS tube, a third MOS tube and a fourth MOS tube;
the non-inverting input end of the first operational amplifier is connected with the reference voltage, and the output end of the first operational amplifier is connected with the grid electrode of the first MOS tube; the negative phase input end of the second operational amplifier is connected with the reference voltage, the positive phase input end of the second operational amplifier is connected with the drain electrode of the second MOS tube, and the output end of the second operational amplifier is connected with the grid electrode of the second MOS tube;
the drain electrode of the third MOS tube is connected with the drain electrode of the first MOS tube, and the drain electrode of the fourth MOS tube is connected with the drain electrode of the second MOS tube;
the third MOS tube and the fourth MOS tube form a first current mirror;
the driving circuit comprises a third operational amplifier, a fifth MOS tube and a sixth MOS tube; the positive phase input end of the third operational amplifier is connected with the reference voltage, the negative phase input end of the third operational amplifier is connected with the source electrode of a fifth MOS tube, the output end of the third operational amplifier is connected with the grid electrode of the fifth MOS tube, the source electrode of the fifth MOS tube is connected with the drain electrode of the sixth MOS tube, and the second MOS tube and the sixth MOS tube form a second current mirror; the drain electrode of the fifth MOS tube is connected with the output end of the driving circuit and is used for outputting driving voltage;
the driving circuit further comprises a seventh MOS tube;
the grid electrode of the seventh MOS tube is used for accessing an enabling signal, and the drain electrode of the seventh MOS tube is connected with the drain electrode of the fifth MOS tube;
the input end of the third operational amplifier is also connected with the enabling signal.
2. The low breakover voltage LED display screen driving circuit of claim 1, wherein: the power supply module is respectively connected with the reference voltage generation module and the constant current output module and respectively outputs working voltage to the reference voltage generation module and the constant current output module;
and the sources of the third MOS tube, the fourth MOS tube and the seventh MOS tube are all connected with the working voltage.
3. The low breakover voltage LED display screen driving circuit of claim 2, wherein:
the reference current generation circuit further comprises a feedback resistor, one end of the feedback resistor is grounded, and the other end of the feedback resistor is connected with the negative phase input end of the first operational amplifier and the source electrode of the first MOS tube.
4. A low breakover voltage LED display screen driving circuit according to claim 3, wherein:
the first MOS tube, the second MOS tube, the fifth MOS tube and the sixth MOS tube all adopt N-type MOS tubes.
5. The low breakover voltage LED display screen driving circuit of claim 4, wherein:
the third MOS tube, the fourth MOS tube and the seventh MOS tube are all P-type MOS tubes.
6. The LED display screen driving circuit with low breakover voltage according to any one of claims 1 to 5, wherein:
the reference voltage generation module comprises a band gap reference circuit and a reference voltage generation circuit, wherein the output end of the band gap reference circuit is connected with the reference voltage generation circuit to provide reference voltage for the reference voltage generation circuit.
7. The low breakover voltage LED display screen driving circuit of claim 6, wherein:
the reference voltage generation circuit comprises a fourth operational amplifier and an eighth MOS tube;
the positive input end of the fourth operational amplifier is connected with the reference voltage, the output end of the fourth operational amplifier is connected with the grid electrode of the eighth MOS tube, and the negative input end of the fourth operational amplifier is connected with the source electrode of the eighth MOS tube;
and the source electrode of the eighth MOS tube is connected with the output end of the reference voltage generating circuit.
8. The low breakover voltage LED display screen driving circuit of claim 7, wherein:
the reference voltage generation circuit further comprises a first resistor and a second resistor;
the source electrode of the eighth MOS tube is connected with the output end of the reference voltage generating circuit through the first resistor;
one end of the second resistor is connected with the output end of the reference voltage generating circuit, and the other end of the second resistor is grounded.
9. An LED display comprising a low breakover voltage LED display driving circuit according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311189126.3A CN117059020B (en) | 2023-09-14 | 2023-09-14 | LED display screen driving circuit with low turning voltage and LED display screen |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311189126.3A CN117059020B (en) | 2023-09-14 | 2023-09-14 | LED display screen driving circuit with low turning voltage and LED display screen |
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| CN117059020A CN117059020A (en) | 2023-11-14 |
| CN117059020B true CN117059020B (en) | 2024-02-27 |
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| US6222357B1 (en) * | 1998-09-07 | 2001-04-24 | Canon Kabushiki Kaisha | Current output circuit with controlled holdover capacitors |
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| Publication number | Publication date |
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| CN117059020A (en) | 2023-11-14 |
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