CN107527594B - Pulse signal adjusting circuit and backlight driving circuit of liquid crystal display screen - Google Patents
Pulse signal adjusting circuit and backlight driving circuit of liquid crystal display screen Download PDFInfo
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- CN107527594B CN107527594B CN201710867516.XA CN201710867516A CN107527594B CN 107527594 B CN107527594 B CN 107527594B CN 201710867516 A CN201710867516 A CN 201710867516A CN 107527594 B CN107527594 B CN 107527594B
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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
- G09G3/34—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 by control of light from an independent source
- G09G3/3406—Control of illumination source
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The embodiment of the invention discloses a pulse signal adjusting circuit and a backlight driving circuit of a liquid crystal display screen. Wherein, this pulse signal adjustment circuit includes: the first input end of the voltage comparator is electrically connected with the input end of the pulse signal adjusting circuit; the second input end is electrically connected with a reference voltage source; the first end of the first switch module is electrically connected with the first input end of the voltage comparator, the second end of the first switch module is electrically connected with the output end of the pulse signal adjusting circuit, and the control end of the first switch module is electrically connected with the output end of the voltage comparator; and the first end of the second switch module is electrically connected with the second input end of the voltage comparator, the second end of the second switch module is electrically connected with the output end of the pulse signal adjusting circuit, and the control end of the second switch module is electrically connected with the output end of the voltage comparator. The embodiment of the invention can improve the voltage compatibility of the sequential control chip of the liquid crystal display screen so as to adapt to different system ends.
Description
Technical Field
The present invention relates to a liquid crystal display technology, and more particularly, to a pulse signal adjusting circuit and a backlight driving circuit of a liquid crystal display.
Background
Smart phones, tablet computers, notebook computers, desktop computers and the like all send image signals to a liquid crystal display screen through a data interface by a main controller at a system end so as to display various pictures.
The main Controller at the system end also transmits a pulse signal for controlling the brightness of the backlight source to a Timing Controller (TCON) of the liquid crystal display screen through the data interface, and controls the brightness of the backlight source by adjusting the pulse width of the pulse signal. Because the amplitude values of the pulse signals output by the main controllers of the system ends of different manufacturers are different, if the amplitude value of the pulse signal exceeds the voltage range accepted by the TCON chip, the liquid crystal display screen works abnormally.
Disclosure of Invention
The embodiment of the invention provides a pulse signal adjusting circuit and a backlight driving circuit of a liquid crystal display screen, which are used for improving the voltage compatibility of a time sequence control chip of the liquid crystal display screen so as to adapt to different system ends.
In a first aspect, an embodiment of the present invention provides a pulse signal adjusting circuit, including:
a voltage comparator including a first input terminal, a second input terminal, and an output terminal;
the first input end is electrically connected with the input end of the pulse signal adjusting circuit and used for receiving a pulse signal; the second input end is electrically connected with the output end of the reference voltage source; the voltage comparator is used for outputting a first level from the output end when the voltage of the first input end is greater than the voltage of the second input end; when the voltage of the first input end is smaller than that of the second input end, the output end outputs a second level which is opposite to the level logic of the first level;
the first switch module comprises a first end, a second end and a control end; the first end of the first switch module is electrically connected with the first input end of the voltage comparator, the second end of the first switch module is electrically connected with the output end of the pulse signal adjusting circuit, and the control end of the first switch module is electrically connected with the output end of the voltage comparator; the first switch module is used for being in an off state when the control end is in a first level; when the control end is at a second level, the first switch module is in a closed state;
the second switch module comprises a first end, a second end and a control end; the first end of the second switch module is electrically connected with the second input end of the voltage comparator, the second end of the second switch module is electrically connected with the output end of the pulse signal adjusting circuit, and the control end of the second switch module is electrically connected with the output end of the voltage comparator; the second switch module is used for being in a closed state when the control end is in a first level; when the control end is at the second level, the second switch module is in an off state.
Further, the first switch module and the second switch module are: a triode or a MOS transistor.
Furthermore, the first input end of the voltage comparator is a non-inverting input end; the second input end of the voltage comparator is an inverting input end.
Further, the first switch module is a PMOS transistor; the first end of the first switch module is a source electrode of the PMOS transistor, the second end of the first switch module is a drain electrode of the PMOS transistor, and the control end of the first switch module is a grid electrode of the PMOS transistor;
the second switch module is an NMOS transistor; the first end of the second switch module is a source electrode of the NMOS transistor, the second end of the second switch module is a drain electrode of the NMOS transistor, and the control end of the second switch module is a grid electrode of the NMOS transistor.
Further, the first switch module is a PNP triode; the first end of the first switch module is a collector electrode of the PNP triode, the second end of the first switch module is an emitting electrode of the PNP triode, and the control end of the first switch module is a base electrode of the PNP triode;
the second switch module is an NPN triode; the first end of the second switch module is an emitting electrode of the NPN triode, the second end of the second switch module is a collecting electrode of the NPN triode, and the control end of the second switch module is a base electrode of the NPN triode.
Furthermore, the first input end of the voltage comparator is an inverting input end; the second input end of the voltage comparator is a non-inverting input end.
Furthermore, the voltage comparator further comprises a power input end and a grounding end, and the power input end is electrically connected with a reference voltage source.
In a second aspect, an embodiment of the present invention further provides a backlight driving circuit for a liquid crystal display, including: the pulse signal adjusting circuit, the data interface, the time sequence control chip and the LED driving circuit provided by any embodiment of the invention,
the pulse signal adjusting circuit is respectively electrically connected with the data interface and the time sequence control chip and is used for adjusting a first pulse signal received by the data interface from the system end so as to output a second pulse signal to the time sequence control chip;
and the time sequence control chip is electrically connected with the LED drive circuit and is used for carrying out black picture detection processing on the second pulse signal and sending a control signal generated after processing to the LED drive circuit so as to drive the backlight source to emit light.
Furthermore, the reference voltage source and the power supply voltage source of the time sequence control chip are the same voltage source.
Further, the pulse signal adjusting circuit is integrated in the timing control chip.
According to the technical scheme of the embodiment of the invention, when the voltage input by the input end of the pulse signal adjusting circuit is higher than the voltage of the reference voltage source, the voltage comparator outputs the first level, so that the first switch module is switched off, the second switch module is switched on, and the voltage output by the output end of the pulse signal adjusting circuit is the voltage of the reference voltage source, so that the phenomenon that the amplitude of the pulse signal exceeds the voltage range accepted by the time sequence control chip of the liquid crystal display screen, which causes the liquid crystal display screen to work abnormally, is avoided, and the voltage compatibility of the time sequence control chip of the liquid crystal display screen is improved, so that the liquid crystal display screen is suitable for different system ends.
Drawings
Fig. 1 is a schematic structural diagram of a pulse signal adjusting circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another pulse signal adjusting circuit according to an embodiment of the present invention;
FIG. 3 is a waveform diagram of an input pulse signal and an output pulse signal of a pulse signal adjusting circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another pulse signal adjusting circuit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another pulse signal adjusting circuit according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another pulse signal adjusting circuit according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a backlight driving circuit of a liquid crystal display panel according to an embodiment of the invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be given to specific embodiments, structures, features and effects of a pulse signal adjusting circuit and a backlight driving circuit of a liquid crystal display according to the present invention with reference to the accompanying drawings and preferred embodiments.
Fig. 1 is a schematic structural diagram of a pulse signal adjusting circuit according to an embodiment of the present invention, and as shown in fig. 1, the pulse signal adjusting circuit includes: a voltage comparator 10, a first switching module 20 and a second switching module 30.
The voltage comparator 10 includes a first input terminal In1, a second input terminal In2, and an output terminal Out 1; the first input end In1 is electrically connected with the input end In0 of the pulse signal adjusting circuit and is used for receiving a pulse signal; the second input terminal In2 is electrically connected to the output terminal Out3 of the reference voltage source 40; the voltage comparator 10 is configured to output a first level at the output terminal Out1 when the voltage at the first input terminal In1 is greater than the voltage at the second input terminal In 2; when the voltage of the first input terminal In1 is less than the voltage of the second input terminal In2, the output terminal Out1 outputs a second level that is logically opposite to the level of the first level; a first switch module 20 comprising a first terminal N1, a second terminal N2, and a control terminal Ctrl 1; the first end N1 of the first switch module 20 is electrically connected to the first input end In1 of the voltage comparator 10, the second end N2 of the first switch module 20 is electrically connected to the output end Out0 of the pulse signal adjusting circuit, and the control end Ctrl1 of the first switch module 20 is electrically connected to the output end Out1 of the voltage comparator 10; the first switch module 20 is configured to turn off the first switch module 20 when the control terminal Ctrl1 is at the first level; when the control terminal Ctrl1 is at the second level, the first switch module 20 is in the closed state; a second switch module 30 comprising a first terminal N3, a second terminal N4, and a control terminal Ctrl 2; the first end N3 of the second switch module 30 is electrically connected to the second input end In2 of the voltage comparator 10, the second end N4 of the second switch module 30 is electrically connected to the output end Out0 of the pulse signal adjusting circuit, and the control end Ctrl2 of the second switch module 30 is electrically connected to the output end Out1 of the voltage comparator 10; the second switch module 30 is configured to be in a closed state when the control terminal Ctrl2 is at the first level; when the control terminal Ctrl2 is at the second level, the second switch module 30 is in the open state.
It should be noted that the operating principle of the voltage comparator is as follows: when the voltage of the non-inverting input end is greater than the voltage of the inverting input end, the output end of the voltage comparator outputs a high level; when the voltage of the non-inverting input terminal is less than the voltage of the inverting input terminal, the output terminal of the voltage comparator outputs a low level. The control end of the first switch module can receive high level or low level, and the first switch module controls the first end and the second end to be opened or closed under the action of the high level or the low level of the control end. The control end of the second switch module can receive high level or low level, and the second switch module controls the first end and the second end to be opened or closed under the action of the high level or the low level of the control end. Optionally, the first input terminal In1 of the voltage comparator 10 is a non-inverting input terminal; the second input terminal In2 of the voltage comparator 10 is an inverting input terminal, and the first level is high level, and the second level is low level. Optionally, the first input terminal In1 of the voltage comparator 10 is an inverting input terminal; the second input terminal In2 of the voltage comparator 10 is a non-inverting input terminal, and the first level is a low level, and the second level is a high level.
The technical scheme of this embodiment is through when the voltage of pulse signal adjusting circuit's input is higher, be higher than reference voltage source's voltage promptly, make voltage comparator output first level, and then make the disconnection of first switch module, the closure of second switch module, the voltage that makes pulse signal adjusting circuit's output be reference voltage source's voltage, in order to avoid pulse signal's amplitude to exceed the voltage range that LCD's time sequence control chip can accept, will lead to liquid crystal display to work unusually, in order to improve liquid crystal display's time sequence control chip's voltage compatibility, in order to adapt to different system ends.
Optionally, the first switch module 20 and the second switch module 30 are: a triode or a MOS transistor.
Optionally, with reference to fig. 1, the voltage comparator 10 further includes a power input terminal V1 and a ground terminal G1, the power input terminal V1 is electrically connected to the output terminal Out3 of the reference voltage source 40, and the high level voltage is equal to the output voltage of the output terminal of the reference voltage source, and the low level voltage is zero.
The embodiment of the invention provides a pulse signal adjusting circuit. Fig. 2 is a schematic structural diagram of another pulse signal adjusting circuit according to an embodiment of the present invention, in which, on the basis of the above embodiment, as shown in fig. 2, when the first input terminal of the voltage comparator 10 is a non-inverting input terminal; the second input end of the voltage comparator 10 is an inverting input end, the first level is a high level, and when the second level is a low level, the first switch module is a PMOS transistor; the first end of the first switch module is a source electrode of the PMOS transistor, the second end of the first switch module is a drain electrode of the PMOS transistor, and the control end of the first switch module is a grid electrode of the PMOS transistor; the second switch module is an NMOS transistor; the first end of the second switch module is a source electrode of the NMOS transistor, the second end of the second switch module is a drain electrode of the NMOS transistor, and the control end of the second switch module is a grid electrode of the NMOS transistor.
For example, taking the voltage of the reference voltage source 40 as 2.5V and the amplitude of the pulse signal as 3V as an example, fig. 3 is a waveform diagram of the input pulse signal and the output pulse signal of the pulse signal adjusting circuit provided by the embodiment of the present invention, and referring to fig. 2 and fig. 3, it can be seen that, at time period t1, the input voltage of the input terminal In0 of the pulse signal adjusting circuit is 3V, which is higher than the voltage of the reference voltage source, so that the voltage comparator outputs a high level, and further the PMOS transistor is turned off (i.e., off state), the NMOS transistor is turned on (i.e., on state), so that the voltage output by the output terminal Out0 of the pulse signal adjusting circuit is the voltage of the reference voltage source, i.e., 2.5V, at time period t2, the input voltage of the input terminal In0 of the pulse signal adjusting circuit is 0V, which is lower than the voltage of the reference voltage source, so that the, the NMOS transistor is turned off, so that the voltage output by the output terminal Out0 of the pulse signal adjusting circuit is the input voltage of the input terminal In0 of the pulse signal adjusting circuit, i.e., 0V. As can be seen from fig. 3, the input pulse signal of the pulse signal adjusting circuit and the output pulse signal have the same frequency and pulse width, and the amplitude of the output pulse signal is lower than that of the input pulse signal.
The embodiment of the invention provides a pulse signal adjusting circuit. Fig. 4 is a schematic structural diagram of another pulse signal adjusting circuit according to an embodiment of the present invention, in which, on the basis of the above embodiment, as shown in fig. 4, when the first input terminal of the voltage comparator 10 is a non-inverting input terminal; the second input end of the voltage comparator 10 is an inverting input end, the first level is a high level, and when the second level is a low level, the first switch module 20 is a PNP triode; the first end of the first switch module 20 is a collector of a PNP triode, the second end of the first switch module 20 is an emitter of the PNP triode, and the control end of the first switch module 20 is a base of the PNP triode; the second switch module 30 is an NPN transistor; the first end of the second switch module 30 is an emitter of an NPN transistor, the second end of the second switch module 30 is a collector of the NPN transistor, and the control end of the second switch module 30 is a base of the NPN transistor.
The embodiment of the invention provides a pulse signal adjusting circuit. Fig. 5 is a schematic structural diagram of another pulse signal adjusting circuit according to an embodiment of the present invention, in which, on the basis of the above embodiment, as shown in fig. 5, when the first input terminal of the voltage comparator 10 is an inverting input terminal; the second input end of the voltage comparator 10 is a non-inverting input end, the first level is a low level, and when the second level is a high level, the first switch module 20 is an NMOS transistor; the first end of the first switch module 20 is a source electrode of the NMOS transistor, the second end of the first switch module 20 is a drain electrode of the NMOS transistor, and the control end of the first switch module 20 is a gate electrode of the NMOS transistor; the second switch module 30 is a PMOS transistor; the first terminal of the second switch module 30 is a source of a PMOS transistor, the second terminal of the second switch module 30 is a drain of the PMOS transistor, and the control terminal of the second switch module 30 is a gate of the PMOS transistor.
The embodiment of the invention provides a pulse signal adjusting circuit. Fig. 6 is a schematic structural diagram of another pulse signal adjusting circuit according to an embodiment of the present invention, in which, on the basis of the above embodiment, as shown in fig. 6, when the first input terminal of the voltage comparator 10 is an inverting input terminal; the second input end of the voltage comparator 10 is a non-inverting input end, the first level is a low level, and when the second level is a high level, the first switch module 20 is an NPN triode; a first end of the first switch module 20 is a collector of the NPN triode, a second end of the first switch module 20 is an emitter of the NPN triode, and a control end of the first switch module 20 is a base of the NPN triode; the second switch module 30 is a PNP triode; the first end of the second switch module 30 is an emitter of the PNP transistor, the second end of the second switch module 30 is a collector of the PNP transistor, and the control end of the second switch module 30 is a base of the PNP transistor.
The embodiment of the invention provides a backlight driving circuit of a liquid crystal display screen. Fig. 7 is a schematic structural diagram of a backlight driving circuit of a liquid crystal display panel according to an embodiment of the present invention, and as shown in fig. 7, the backlight driving circuit of the liquid crystal display panel includes: the pulse signal adjusting circuit 110, the data interface 120, the timing control chip 130 and the LED driving circuit 140 are provided in any embodiment of the present invention.
The pulse signal adjusting circuit 110 is electrically connected to the data interface 120 and the timing control chip 130, and is configured to adjust a first pulse signal received by the data interface 120 from a system end to output a second pulse signal to the timing control chip; the timing control chip 130 is electrically connected to the LED driving circuit 140, and configured to perform black frame detection processing on the second pulse signal, and send a control signal generated after the processing to the LED (Light Emitting Diode) driving circuit 140, so as to drive the backlight to emit Light.
It should be noted that the system end may be a host of a notebook computer, a desktop computer, or a tablet computer, and the host is connected to the liquid crystal display screen through a data interface. The liquid crystal display screen comprises a backlight module, an array substrate, a color film substrate opposite to the array substrate and a liquid crystal layer positioned between the array substrate and the color film substrate. The backlight module comprises a backlight source, a light guide plate and the like. The backlight includes light emitting diodes. The system end can adjust the brightness of the backlight source by adjusting the pulse width of the first pulse signal. The technical scheme of this embodiment, data interface is connected to the time sequence control chip through pulse signal adjustment circuit, can make the pulse control signal of the system end transmission of different producers or product satisfy the voltage range that the time sequence control chip accepted, compare in the mode through resistance partial pressure, the mode that the pulse control signal of system end transmission can step down (need according to the pulse control signal of different system end transmissions, adjust divider resistance properly), not only can improve liquid crystal display's time sequence control chip's voltage compatibility, in order to adapt to different system ends, and it is more convenient, need not to change the device.
Optionally, the reference voltage source and the power supply voltage source of the timing control chip are the same voltage source.
Optionally, the pulse signal adjusting circuit is integrated in the timing control chip.
The backlight driving circuit of the liquid crystal display screen provided by the embodiment of the invention comprises the pulse signal adjusting circuit in the embodiment, so that the backlight driving circuit of the liquid crystal display screen provided by the embodiment of the invention also has the beneficial effects described in the embodiment, and the description is omitted here.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. A backlight driving circuit for a liquid crystal display panel, comprising: a pulse signal adjusting circuit, a data interface, a time sequence control chip and an LED drive circuit,
wherein the pulse signal adjusting circuit includes:
a voltage comparator including a first input terminal, a second input terminal, and an output terminal;
the first input end is electrically connected with the input end of the pulse signal adjusting circuit and used for receiving a pulse signal; the second input end is electrically connected with the output end of the reference voltage source; the voltage comparator is used for outputting a first level from the output end when the voltage of the first input end is greater than the voltage of the second input end; when the voltage of the first input end is less than the voltage of the second input end, the output end outputs a second level which is opposite to the level logic of the first level;
the first switch module comprises a first end, a second end and a control end; the first end of the first switch module is electrically connected with the first input end of the voltage comparator, the second end of the first switch module is electrically connected with the output end of the pulse signal adjusting circuit, and the control end of the first switch module is electrically connected with the output end of the voltage comparator; the first switch module is used for being in an off state when the control end is in the first level; when the control end is at the second level, the first switch module is in a closed state;
the second switch module comprises a first end, a second end and a control end; the first end of the second switch module is electrically connected with the second input end of the voltage comparator, the second end of the second switch module is electrically connected with the output end of the pulse signal adjusting circuit, and the control end of the second switch module is electrically connected with the output end of the voltage comparator; the second switch module is used for being in a closed state when the control end is at the first level; when the control end is at the second level, the second switch module is in an off state;
the high level of an input pulse signal of the pulse signal adjusting circuit is higher than the voltage of the output end of the reference voltage source, the low level of the input pulse signal of the pulse signal adjusting circuit is lower than the voltage of the output end of the reference voltage source, and the frequency and the pulse width of the input pulse signal of the pulse signal adjusting circuit are the same as those of an output pulse signal;
the pulse signal adjusting circuit is respectively electrically connected with the data interface and the time sequence control chip and is used for adjusting a first pulse signal received by the data interface from a system end so as to output a second pulse signal to the time sequence control chip;
the time sequence control chip is electrically connected with the LED drive circuit and is used for carrying out black picture detection processing on the second pulse signal and sending a control signal generated after processing to the LED drive circuit so as to drive the backlight source to emit light;
the reference voltage source and the power supply voltage source of the time sequence control chip are the same voltage source;
the first input end of the voltage comparator is an inverting input end; and the second input end of the voltage comparator is a non-inverting input end.
2. The backlight driving circuit of claim 1, wherein the first and second switching modules are transistors or MOS transistors.
3. The backlight driving circuit of claim 1, wherein the voltage comparator further comprises a power input terminal and a ground terminal, and the power input terminal is electrically connected to the reference voltage source.
4. The backlight driving circuit of claim 1, wherein the pulse signal adjusting circuit is integrated in the timing control chip.
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| CN201710867516.XA CN107527594B (en) | 2017-09-22 | 2017-09-22 | Pulse signal adjusting circuit and backlight driving circuit of liquid crystal display screen |
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| CN111431510B (en) * | 2020-05-08 | 2023-04-21 | 恒为科技（上海）股份有限公司 | Pulse signal generating circuit and electronic equipment |
| CN112652274A (en) * | 2020-12-24 | 2021-04-13 | 联想(北京)有限公司 | Backlight control method and device |
| CN113470582B (en) * | 2021-07-28 | 2022-07-15 | 昆山龙腾光电股份有限公司 | PWM output circuit and liquid crystal display device |
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| JP2000050247A (en) * | 1998-07-28 | 2000-02-18 | Aiphone Co Ltd | Video interphone device |
| JP2007194144A (en) * | 2006-01-20 | 2007-08-02 | Matsushita Electric Ind Co Ltd | Lamp lighting device, backlight unit, and display device |
| US7868603B2 (en) * | 2006-10-04 | 2011-01-11 | Microsemi Corporation | Method and apparatus to compensate for supply voltage variations in a PWM-based voltage regulator |
| CN103021317B (en) * | 2012-12-14 | 2015-09-09 | 京东方科技集团股份有限公司 | Driving circuit and display screen |
| CN104300873A (en) * | 2013-07-16 | 2015-01-21 | 台达电子（东莞）有限公司 | Motor rotating speed control device, method and system |
| TWI559113B (en) * | 2015-10-19 | 2016-11-21 | Macroblock Inc | Voltage control device |
| CN205562658U (en) * | 2016-02-22 | 2016-09-07 | 深圳市明微电子股份有限公司 | Pulse spike amplitude measuring device and measuring circuit thereof |
| CN105913788A (en) * | 2016-06-06 | 2016-08-31 | 深圳市华星光电技术有限公司 | Detection circuit of liquid crystal display panel and detection method thereof |
| CN105845068B (en) * | 2016-06-15 | 2018-11-23 | 京东方科技集团股份有限公司 | A kind of power supply circuit of source drive module, display panel and display device |
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