CN113608569B - Display screen driving IC - Google Patents
Display screen driving IC Download PDFInfo
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- CN113608569B CN113608569B CN202110897216.2A CN202110897216A CN113608569B CN 113608569 B CN113608569 B CN 113608569B CN 202110897216 A CN202110897216 A CN 202110897216A CN 113608569 B CN113608569 B CN 113608569B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
- G05F1/567—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for temperature compensation
Abstract
The invention discloses a display screen driving IC, which comprises a digital part module, an analog part module and a transverse output port, wherein the digital part module is connected with the analog part module through the transverse output port; the analog part module comprises a reference source circuit, a charge pump circuit and a substrate voltage conversion circuit, wherein the substrate voltage conversion circuit is connected with the charge pump circuit; the reference source circuit comprises a band-gap reference circuit and a starting circuit, and the charge pump circuit comprises a drain voltage detection unit, a mode control unit, an oscillator unit, a charge pump unit and a current mirror; the charge pump circuit becomes the high potential of the whole drive IC after being added by the substrate voltage conversion circuit, and is matched with the reference source voltage generated by the reference source circuit to obtain different analog voltages, thereby driving the display screen to work.
Description
Technical Field
The invention relates to the field of display screen control, in particular to a display screen driving IC.
Background
Automobile cabin intellectualization has become a trend of automobiles nowadays, and automobiles are usually provided with vehicle navigation systems, wherein the vehicle navigation systems comprise vehicles with liquid crystal display screens of different manufacturers, or the sizes of the liquid crystal display screens in different types of vehicles can be different, such as 12.3 inches in large size, 10.1 inches in small size and 7 inches in small size; the principle of the lcd determines that several kinds of power supply voltages are required for driving, there is an analog voltage AVDD used for supplying power to a display driving chip (also called a driver IC) of the lcd, including a gate high voltage VGH and a gate low voltage VGL of an internal TFT (Thin Film Transistor, TFT for short) of the lcd, and a common voltage VCOM between electrodes controlling a liquid crystal rotation angle inside the lcd, where these four kinds of power supply voltages are key characteristics that determine that the lcd cannot normally display, and the lcd has strict requirements for up/down power timing sequences of these four kinds of power supply voltages, and if it does not satisfy the up/down power timing sequences, the lcd displays various abnormal phenomena, such as abnormal display.
Therefore, a reliable and low-cost driving scheme is needed to improve the reliability of the liquid crystal display, thereby improving the reliability and safety of the electronic device using the liquid crystal display, and in addition, reducing the overall cost of the electronic device.
Disclosure of Invention
Aiming at the defects in the technology, the invention provides the display screen driving IC, which can effectively display the picture by adjusting and stabilizing the voltage for driving the LED to display, is not influenced by any temperature and ensures the use reliability.
In order to achieve the purpose, the invention provides a liquid crystal display screen driving IC, which comprises a digital part module, an analog part module and a transverse output port, wherein the digital part module is connected with the analog part module through the transverse output port; the analog part module comprises a reference source circuit, a charge pump circuit and a substrate voltage conversion circuit, wherein the substrate voltage conversion circuit is connected with the charge pump circuit; the reference source circuit comprises a band-gap reference circuit and a starting circuit, and the charge pump circuit comprises a drain voltage detection unit, a mode control unit, an oscillator unit, a charge pump unit and a current mirror; the charge pump circuit becomes the high potential of the whole drive IC after being added by the substrate voltage conversion circuit, and is matched with the reference source voltage generated by the reference source circuit to obtain different analog voltages, thereby driving the liquid crystal display screen to work.
Preferably, the bandgap reference circuit is a segmented temperature-compensated bandgap reference circuit, and comprises a starting circuit, a bias circuit, a bandgap reference core circuit and a temperature compensation circuit, wherein the starting circuit is composed of resistors R1 and R2 and transistors Q1, Q2, Q3 and Q6; the bias circuit is composed of transistors Q1p1, Q1p2, Q3 and Q4 and resistors R3 and R4, wherein R3, R4, Q3 and Q4 are engineering bipolar peak current sources, and Q1p1 and Q1p2 are composed of current mirrors.
Preferably, the temperature compensation circuit is composed of transistors Q11, Q12, Q13 and resistors R5, R11, R12, R13 and R14, wherein Q12 and Q13 are two compensation branches.
Preferably, the starting circuit is a bias circuit which is added with a starting element and is independent of a power supply, and the bias circuit comprises a limit voltage stabilizing circuit.
Preferably, the reference source circuit further comprises an over-low temperature protection circuit and a power-on reset circuit, the over-low temperature protection circuit is provided with a comparator and a logic circuit, an input signal and a reference signal are respectively added to two ends of the comparator, and after the two signals are compared, the comparator outputs a result to the logic circuit to finally obtain a protection signal.
Preferably, in the charge pump circuit, the drain voltage detection circuit comprises an or gate and a plurality of comparators, the plurality of comparators are connected in parallel with each other, a mos tube is connected to each comparator, a G pole of the mos tube is connected to a current source, an S pole is connected to ground, and a D pole is connected to the comparator.
Preferably, the mode control unit is a switch circuit, and 9 switch mos transistors are provided, and the voltage adjustment in different states is realized by turning on or off in different phases.
Preferably, the circuit of the charge pump unit is composed of a non-overlapping clock, a transconductance operational amplifier and a current control current source, a voltage division signal of the output voltage of the charge pump and a fixed shop generated by an internal reference source are respectively used as a negative end and a positive end of the internal transconductance operational amplifier to be input, and the two clocks are driven by the non-overlapping clock.
Preferably, the substrate voltage conversion circuit is provided with a hysteresis comparator for comparing the voltages of VIN1 and CPO, thereby ensuring that the output voltage is always high.
The invention has the beneficial effects that: according to the display screen driving IC provided by the invention, the band gap reference circuit is arranged, so that the negative temperature characteristic in the prior art is effectively solved, the LED is enabled to emit light more stably without being influenced by the external environment, and meanwhile, the current mode is adopted to control the charge pump, so that the low-frequency noise is reduced, and the driving capability of the charge pump is improved; in addition, aiming at a driving circuit of the charge pump, the voltage outer ring finishes multi-mode conversion of the charge pump through self-adaptive adjustment of the voltage outer ring and the current inner ring, the current inner ring ensures stable output of the charge pump, the voltage output of the charge pump is stabilized by using a double feedback loop, and the control of the LED screen is realized by matching with a reference source voltage.
Drawings
FIG. 1 is a circuit diagram of the over-low temperature protection circuit of the present invention.
FIG. 2 is a power-on reset circuit diagram of the present invention;
FIG. 3 is a linear voltage regulator circuit according to the present invention;
FIG. 4 is a start-up circuit of the present invention;
FIG. 5 is a bandgap reference circuit of the present invention;
FIG. 6 is a block diagram of a charge pump system of the present invention;
FIG. 7 is a circuit diagram of the voltage loop control of the present invention;
FIG. 8 is a circuit diagram of the current inner loop control circuit of the charge pump of the present invention;
FIG. 9 is a drain voltage detection circuit of the present invention;
FIG. 10 is an oscillator circuit of the present invention;
FIG. 11 is a mode control circuit of the present invention;
FIG. 12 is a substrate voltage conversion circuit of the present invention;
FIG. 13 is a circuit diagram of a charge pump according to the present invention;
FIG. 14 is a non-overlapping clock driver circuit of the present invention;
FIG. 15 is a circuit diagram of a current controlled current source according to the present invention;
FIG. 16 is a circuit diagram of a transconductance operational amplifier of the present invention;
fig. 17 is a waveform diagram of the LED display according to the present invention.
Detailed Description
In order to more clearly describe the present invention, the present invention is further described below with reference to the accompanying drawings.
The invention discloses a display screen driving IC, which comprises a digital part module, an analog part module and a transverse output port, wherein the digital part module and the analog part module are connected through the transverse output port; the analog part module comprises a reference source circuit, a charge pump circuit and a substrate voltage conversion circuit, wherein the substrate voltage conversion circuit is connected with the charge pump circuit; the reference source circuit comprises a band-gap reference circuit and a starting circuit, and the charge pump circuit comprises a drain voltage detection unit, a mode control unit, an oscillator unit, a charge pump unit and a current mirror; the charge pump circuit becomes the high potential of the whole drive IC after being added by the substrate voltage conversion circuit, and is matched with the reference source voltage generated by the reference source circuit to obtain different analog voltages, thereby driving the liquid crystal display screen to work
Referring to fig. 1 to 3, for a display panel, especially an LED display panel, because its operating temperature range is narrow, its voltage will decrease with the increase of temperature, and has a negative temperature characteristic, therefore, as the driving voltage of the LED, it is also required to have such a characteristic to meet the operating requirement; however, the whole circuit is possibly affected by too low temperature, therefore, an over-low temperature protection circuit is arranged, the over-low temperature protection circuit comprises a comparator and a logic circuit, an input signal and a reference signal are respectively added at two ends of the comparator, the two signals are compared, the result is output to the logic circuit by the comparator, a protection signal is finally output after the processing of the logic circuit, the signal is sent into an analog module, when the output protection signal is low level, the analog module stops working to play a protection role, and a delay is added at one end of a NOR gate to prevent false triggering caused by unstable output of the comparator. In addition, a power-on reset circuit is also arranged, and the potential V at the point A is applied before the power supply supplies power A =0,V DD =0, at this time, the reset signal reset is low level, and after the power supply starts to be powered on, the potential of the point a is still low, and V DD The reset signal reset is high, the output of the reset signal reset is high level, after a period of time, the capacitor C is full of electric charges, the potential of the point A is high, the reset signal reset can output low level again, and the circuit enables the whole driving IC to reset firstly and restore to the initial state when the driving IC works, so that disordered signal output is avoided.
Referring to fig. 5, since the driving voltage has a negative temperature characteristic, the voltage is unstable, a band gap reference circuit is used to determine a voltage independent of temperature, so that the obtained voltage has high precision and is independent of temperature, the basic principle of the band gap reference circuit is to use two voltages with positive and negative temperature coefficients to clamp with proper weight to obtain a reference voltage with zero temperature coefficient, thereby establishing a high-precision low-temperature band gap reference circuit, which includes a start circuit, a bias circuit, a band gap reference circuit and a temperature supplement circuit, wherein Q1-Q12 are NPN type triodes, and Q1p1-Q1p5 are PNP type triodes; the band gap reference circuit has two merging points, namely a zero point and a normal operating point, the starting circuit is designed to prevent the circuit from operating at a stable zero point, the starting circuit is composed of resistors R1 and R2 and transistors Q1, Q2, Q3 and Q6, wherein R1, R2, Q1, Q2 and Q3 enable a bias circuit to be separated from the zero point, Q6 enables a feedback loop to be separated from the zero point, after the circuit is electrified, a Q1 branch is conducted, current enters a Q4 branch through Q1p1 and Q2, the bias circuit is conducted, the circuit is provided for each reference branch through Q3, after the reference core normally operates, the voltage of an emitter of Q2 is raised, and Q2 is closed; a transistor Q6 is added in the starting circuit and is driven by the voltage of an emitter of a Q2, so that a common emitter Q5 is quickly opened in the power-on process, a feedback loop works immediately, and the reference level is quickly established. When a feedback loop is separated from a zero point, the base voltage of Q5 is raised, Q6 is closed, a bias circuit is used for providing bias current for a feedback loop of a bandgap reference core machine (BGR), and the bias circuit is composed of transistors Q1p1, Q1p2, Q3 and Q4, resistors R3 and R4, wherein Q3, Q4, R3 and R4 form a bipolar peak current source, Q1p1 and Q1p2 form a current mirror, and the current mirror amplifies the current and supplies the amplified current to each branch; in the bandgap reference circuit, Q8, Q9 and R7 form currents proportional to absolute temperature, so that a reference voltage can be obtained by adjusting a resistance value; in the temperature compensation circuit, the temperature compensation circuit is composed of transistors Q11, Q12 and Q13 and resistors R5, R11, R12, R13 and R14.
Referring to fig. 3 and 4, when the reference source circuit is operated, a start-up circuit is first required to trigger to enable the reference source circuit to enter an operating state from an inactive state, in the start-up circuit, when a start-up signal comes, the MOS transistor M5 is turned on, a path is formed at this time, and the transistors M1-M4 are turned on. After conduction, the circuit begins to bias itself to form two current mirrors,the current on both sides is continuously copied until the I is stabilized 1 =I 2 (ii) a When the high-precision low-temperature band-gap reference circuit is used, the starting circuit is connected with the high-precision low-temperature band-gap reference circuit, so that stable reference source voltage is obtained, in the specific using process, as the driving capability of the reference source is very small and cannot meet the using requirement, a linear voltage stabilizing circuit is further needed to adjust the current, and the desired reference current can be obtained by only selecting proper reference voltage and adjusting the length ratios of two tubes, namely the resistor R, the resistor M1 and the resistor M2.
Please refer to fig. 6; for the acquisition of the charge pump voltage, a charge pump system is adopted, the charge pump system comprises a drain voltage detection unit, a mode control unit, an oscillator unit, a charge pump unit and a current mirror, wherein C1P, C1N, C2P and C2N are externally connected with a positive electrode and a negative electrode of a cross-over capacitor C1 and C2, CPO is an output end of the charge pump, and the charge pump voltage of the temperature is output.
Referring to fig. 7 and 8, the present application employs two loops for control: current loop and voltage ring, during the mode conversion, the voltage outer loop is through the resistance that changes the sampling resistance R1 of current inner loop, utilizes two loops to carry out feedback control to the charge pump jointly and realizes the required output voltage of different modes, and is more specific: in 1X mode, V IN And when the drain voltage detection unit detects that the voltage on the liquid crystal display screen is lower than the threshold value, the mode control unit switches to the 2X mode, and if the drain voltage detection unit detects that the voltage on the liquid crystal display screen is still lower than the threshold value, the mode control unit turns off the circuit so that the whole circuit does not work. When the voltage obtained after boosting meets the use requirement, the voltage loop cannot detect a boosting signal at the moment, the charge pump unit is in a stable state at the moment, and only the current loop performs feedback control on the charge pump unit. The CPO is divided by internal resistors R1 and R2 as a sampling voltage. When the CPO is reduced and the sampling value is less than the set voltage, the charging current generated by the current mirror operational amplifier GM isThe CPO is increased, so that the CPO is increased, the sampling value of the CPO is the same as the set voltage, and the stable charge pump voltage is obtained.
In order to achieve the above object, the voltage outer loop control circuit is as follows: the LED is a light emitting diode, and the M is a switch tube which is conducted under normal conditions to transmit LED current. Regulation I set1 And I set2 The resistor and the current source can set different currents, and the voltage V is set according to the set current parameter set Thereby determining the LED current, and when the LED current is determined, a parameter is a fixed comparison level V related to the LED current CS 。V drop The forward conduction voltage V of the LED is the low-side voltage of the LED under the condition of current determination led Is substantially constant, and V drop =V out -V led ，V out Decreases with decreasing battery voltage, resulting in V drop Also decreases. When the charge pump can not provide the forward conduction voltage required by the LED luminous current, the charge pump enters a boosting mode, and V is at the moment drop <V CS And the comparator is turned over, the parameter mode controls signals, and then clock signals corresponding to the conduction logic and the duty ratio are generated to control the boosting of the charge pump.
The current inner loop control circuit comprises the following components: sampling charge pump output voltage V out Is divided by a voltage signal V fb ，V fb Fixed level V generated from internal reference source ref The charge current NI of the cross-over capacitor is adjusted through the error of the two supports GM Therefore, the output voltage is stabilized, and more specifically, the Cell1 and the Cell2 adopt the same current control circuit to charge and discharge the capacitor. In the first phase, when CK1 is high and CK2 is low, Cell1 charges capacitor C1, which charges output capacitor Cout via a switch, and Cell2 charges capacitor C2. In another phase, when CK1 is low and CK2 is high, Cell1 and Cell2 work in reverse.
Please refer to fig. 9-16; for the drain voltage detection circuit, the drain voltage of each circuit is compared with a threshold voltage Vcs through a comparator COMP, and the comparison result outputs a signal V 1 -V N Output through OR gates, these signalsWhen any one of the signs is high, the drain voltage is too low, and the output voltage is insufficient to provide the required current. Therefore, any one of the information is controlled to be high level, so that the mode conversion selects the boosting mode, high voltage is output, and the use requirement is met.
In a specific using process, the oscillator mainly takes an SMIT trigger as a core to form a resistance-capacitance charging and discharging loop, and a fixed period to an oscillation signal is obtained by controlling a charging and discharging period to control a duty ratio.
The mode control unit is a switch circuit, and all switch states in the circuit are controlled by two clocks with complementary phases, so that 3 (1X, 1.5X and 2X) ideal voltage gain values can be realized by fixing the on or off of 9 switch MOS tubes in the control circuit under different phases.
The charge pump unit consists of a non-overlapping clock, a transconductance operational amplifier, a current control current source and a switch, a voltage division signal Vfb of an output voltage Vout of the charge pump and a fixed level Vref of an internal reference source origin are respectively used as the negative end and the positive end of the internal transconductance operational square-root to be input, and an error parameter I between the negative end and the positive end GM . The charging path is controlled by CK2, and the discharging path is controlled by CK 1. The two clocks are driven by non-overlapping clocks, and one switch has current NI in oil inlet of each path GM This switch is controlled as a Current Controlled Current Source (CCCS). The single-path output circuit of the transconductance operation method controls the current of the CCCS, and the double-path control of the charging and discharging paths is realized.
The clocks generate non-overlapping clocks by feeding back to the nand gates. If the clock input goes from low to high, the input of NAND gate 1 goes low and the output goes high, with the result that CK 1 Goes high once CK 1 High, one input end of the NAND gate 2 is high, output is low, and the high-level voltage passes through a plurality of inverters CK 2 Becomes high, thus CK 1 And CK 2 A certain delay is formed between them, when the clock goes low, the whole process is reversed. For a current control current source, a PMOS tube 1 and a PMOS tube 3 form a current mirror, when CLK is high, M4, M1 and M3 are conducted, and I CH Current and I GM The currents are in a mirror image relation; the charge pump has a high impedance capacitive load, which causesThe amplifier is a current mirror operational amplifier, the operational amplifier is composed of two stages, the input electrode adopts a fully differential folded cascode structure, common mode feedback is introduced by M3 and M4, a second stage is composed of M5, M6, M18 and M19 to complete voltage-to-current conversion, and C E1 And C E2 To compensate for capacitance. The substrate voltage conversion circuit is provided with a hysteresis comparator, and the voltage of VIN1 and CPO is compared, so that the output voltage is always high.
Please refer to fig. 17; when the stable charge pump voltage is obtained, the stable charge pump voltage and the reference source voltage obtained in the foregoing are freely combined to provide a suitable voltage for the LED, and the LED is driven by matching the digital waveform, and it can be seen from the figure that the waveform of the row driving (COMS) output corresponds to six different voltages, respectively, V Lcd 、V Lcd -V ref 、V Lcd -2V ref 、2V ref 、V ref And a potential of 0, in other words, so long as these six driving voltages can be generated, the LED display panel can be driven to operate, but careful analysis can determine that only two voltages, i.e., V, are actually required Lcd And V ref (ii) a And V LCD For charge pump circuit generation, V ref The reference source circuit is used for generating the reference voltage so as to drive the LED display screen to work.
The above disclosure is only for a few specific embodiments of the present invention, but the present invention is not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.
Claims (8)
1. A display screen driving IC comprises a digital part module, an analog part module and a transverse output port, wherein the digital part module is connected with the analog part module through the transverse output port; the analog part module comprises a reference source circuit, a charge pump circuit and a substrate voltage conversion circuit, wherein the substrate voltage conversion circuit is connected with the charge pump circuit; the reference source circuit comprises a band gap reference circuit and a starting circuit, and the charge pump circuit comprises a drain voltage detection unit, a mode control unit, an oscillator unit, a charge pump unit and a current mirror; the charge pump circuit is converted by the substrate voltage conversion circuit to be the high potential of the whole drive IC and is matched with the reference source voltage generated by the reference source circuit to obtain different analog voltages so as to drive the display screen to work;
two loops are used for control: a current inner loop and a voltage outer loop; during mode conversion, the voltage outer loop utilizes two loops to carry out feedback control on the charge pump together by changing the resistance value of the sampling resistor R1 of the current inner loop so as to realize the output voltage required by different modes;
in the charge pump circuit, the drain voltage detection circuit comprises an OR gate and a plurality of comparators, the comparators are connected in parallel, each comparator is connected with a mos tube, the G pole of the mos tube is connected with a current source, the S pole of the mos tube is grounded, and the D pole of the mos tube is connected with the comparators.
2. The display screen driving IC of claim 1, wherein the bandgap reference circuit is a segmented temperature complementary bandgap reference circuit, and comprises a start-up circuit, a bias circuit, a bandgap reference core circuit and a temperature complementary circuit, the start-up circuit is composed of resistors R1 and R2 and transistors Q1, Q2, Q3 and Q6; the bias circuit is composed of transistors Q1p1, Q1p2, Q3 and Q4 and resistors R3 and R4, wherein R3, R4, Q3 and Q4 are engineering bipolar peak current sources, and Q1p1 and Q1p2 are composed of current mirrors.
3. The display panel driving IC of claim 2, wherein the temperature compensation circuit comprises transistors Q11, Q12, Q13 and resistors R5, R11, R12, R13, R14, wherein Q12 and Q13 are two compensation branches.
4. The display driver IC of claim 1, wherein the power-on circuit is a power-independent bias circuit with an additional startup element, and the bias circuit includes a voltage-limiting regulator circuit.
5. The display panel driving IC of claim 1, wherein the reference source circuit further includes an over-low temperature protection circuit and a power-on reset circuit, the over-low temperature protection circuit is provided with a comparator and a logic circuit, an input signal and a reference signal are respectively applied to two ends of the comparator, and after comparing the two signals, the comparator outputs a result to the logic circuit, and a protection signal is finally obtained.
6. The panel driving IC of claim 1, wherein the mode control unit is a switching circuit provided with 9 switching mos transistors, and the voltage adjustment in different states is performed by turning on or off in different phases.
7. The display panel driving IC of claim 1, wherein the circuit of the charge pump unit is composed of a non-overlapping clock, a transconductance operational amplifier, and a current-controlled current source, a voltage-divided signal of the output voltage of the charge pump and a fixed shop generated by an internal reference source are respectively input as a negative terminal and a positive terminal of the internal transconductance operational amplifier, and the two clocks are driven by the non-overlapping clock.
8. The panel driving IC of claim 1, wherein the substrate voltage converting circuit is provided with a hysteresis comparator for comparing the voltages of VIN1 and CPO, thereby ensuring that the output voltage is always high.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000105611A (en) * | 1998-09-28 | 2000-04-11 | Sanyo Electric Co Ltd | Charge pump circuit |
| CN1591115A (en) * | 2003-08-29 | 2005-03-09 | 罗姆股份有限公司 | Power supply apparatus |
| CN101303823A (en) * | 2007-05-09 | 2008-11-12 | 晨星半导体股份有限公司 | Circuit for providing voltage and correlation technique thereof |
| CN103095127A (en) * | 2013-01-22 | 2013-05-08 | 上海艾为电子技术有限公司 | Charge pump circuit and electronic equipment |
| CN104767518A (en) * | 2015-04-20 | 2015-07-08 | 成都岷创科技有限公司 | Substrate switching circuit based on CMOS |
| CN204518162U (en) * | 2015-04-09 | 2015-07-29 | 杭州宽福科技有限公司 | A kind of charge pump type LED drive chip |
| CN107767823A (en) * | 2016-08-22 | 2018-03-06 | 王小义 | A kind of super twisted nematic liquid crystal display drives IC analog circuits |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8773038B2 (en) * | 2011-08-26 | 2014-07-08 | Infineon Technologies Ag | Driver circuit for efficiently driving a large number of LEDs |
-
2021
- 2021-08-05 CN CN202110897216.2A patent/CN113608569B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000105611A (en) * | 1998-09-28 | 2000-04-11 | Sanyo Electric Co Ltd | Charge pump circuit |
| CN1591115A (en) * | 2003-08-29 | 2005-03-09 | 罗姆股份有限公司 | Power supply apparatus |
| CN101303823A (en) * | 2007-05-09 | 2008-11-12 | 晨星半导体股份有限公司 | Circuit for providing voltage and correlation technique thereof |
| CN103095127A (en) * | 2013-01-22 | 2013-05-08 | 上海艾为电子技术有限公司 | Charge pump circuit and electronic equipment |
| CN204518162U (en) * | 2015-04-09 | 2015-07-29 | 杭州宽福科技有限公司 | A kind of charge pump type LED drive chip |
| CN104767518A (en) * | 2015-04-20 | 2015-07-08 | 成都岷创科技有限公司 | Substrate switching circuit based on CMOS |
| CN107767823A (en) * | 2016-08-22 | 2018-03-06 | 王小义 | A kind of super twisted nematic liquid crystal display drives IC analog circuits |
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