CN103927993A - Display screen backlight control circuit and method and display device - Google Patents
Display screen backlight control circuit and method and display device Download PDFInfo
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- CN103927993A CN103927993A CN201310698440.4A CN201310698440A CN103927993A CN 103927993 A CN103927993 A CN 103927993A CN 201310698440 A CN201310698440 A CN 201310698440A CN 103927993 A CN103927993 A CN 103927993A
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Abstract
The embodiment of the invention relates to the technical field of display screens, in particular to a display screen backlight control circuit and method and a display device. The display screen backlight control circuit comprises a discharging circuit and a switching circuit, wherein the first end of the discharging circuit is used for being connected with the output end of a backlight driving circuit, the second end of the discharging circuit is used for being connected with an earth line, the first end of the switching circuit is used for being connected with the output end of the backlight driving circuit, the second end of the switching circuit is used for being connected with the input end of a backlight source, the third end of the switching circuit is used for being connected with a shutdown control signal line, and the switching circuit conducts connection or disconnection according to signals on a shutdown control signal line. According to the technical scheme, when shutdown occurs, the backlight driving circuit and the backlight source are disconnected through the switching circuit, charges stored in the backlight driving circuit are released through the discharging circuit, and therefore shadow produced by the charges in the backlight driving circuit after shutdown is eliminated.
Description
Technical field
The present invention relates to display screen technology field, relate in particular to a kind of display backlight control circuit, display backlight control method and display device.
Background technology
Display screen, comprises LCDs (LCD, Liquid Crystal Display) and OLED display screen (OLED, Organic Light-Emitting Diode) etc.Take LCDs as example, be called for short liquid crystal display, dispose corresponding backlight drive circuit in liquid crystal display, backlight drive circuit drives in liquid crystal display back light luminous, and then utilizes the illumination effect of back light to realize the display effect of liquid crystal display.
Shown in Fig. 1 is liquid crystal screen backlight control circuit schematic diagram in prior art; In prior art, liquid crystal display backlight control comprises backlight drive circuit 101 and 102 two parts of back light, and the backlight drive circuit 101 that is connected in power supply voltage signal line directly drives back light 102.This type of drive in prior art, when closing machine control signal, act on after backlight drive circuit 101, power supply disconnects, but after the power supply disconnection that power supply voltage signal line provides, in backlight drive circuit 101, still deposit certain electric charge, such as the electric charge of the storages such as the filter capacitor in backlight drive circuit 101.After power supply disconnects, in backlight drive circuit 101, the electric charge of storage still can act on back light 102, make back light voltage keep the noble potential of certain hour, and then after power supply disconnects, back light 102 still can continue luminous certain hour, causes display panels to occur ghost phenomena.Shown in Fig. 2 is that in prior art, liquid crystal display backlight drive circuit disconnects the schematic diagram of the variation of rear supply voltage and back light voltage at power supply; In Fig. 2, when power supply is after T1 disconnects constantly, through certain hour to T2 constantly after supply voltage make zero.But at T2 after constantly supply voltage makes zero, because of the existence of spurious charge in backlight drive circuit 101 make T2 constantly back light voltage do not make zero yet, and be V1; With this, make the still luminescent effect of certain time of back light 102, cause the ghost phenomena of liquid crystal display in display device.
Summary of the invention
The object of the invention is to propose a kind of display backlight control circuit, display backlight control method and display device, to eliminate the ghost phenomena of the rear display screen of shutdown.
In first aspect, the embodiment of the present invention provides a kind of display backlight control circuit, comprising:
Discharge circuit and on-off circuit; Wherein,
The first end of described discharge circuit is for being connected with the output terminal of backlight drive circuit, and the second end of described discharge circuit is for being connected with ground wire;
The first end of described on-off circuit is for being connected with the output terminal of described backlight drive circuit, and the second end of described on-off circuit is for being connected with the input end of back light, and the 3rd end of described on-off circuit is for being connected with shutdown control signal wire; And
Described on-off circuit is according to signal closes or disconnection on described shutdown control signal wire.
In second aspect, the embodiment of the present invention also provides a kind of display device, comprises
The display backlight control circuit of above-mentioned first aspect.
In the third aspect, the embodiment of the present invention also provides a kind of display backlight control circuit of above-mentioned first aspect that utilizes to carry out display backlight control method, comprising:
Opening steps backlight, step and the discharge step of closing backlight.
The display backlight control circuit that the embodiment of the present invention provides, display backlight control method and display device, after shutdown, the pass machine control signal gauge tap circuit that shutdown control signal wire provides disconnects; And in shutdown, the electric charge of depositing after shutdown in backlight drive circuit can not transfer to back light by on-off circuit again, but by the discharge circuit being connected with backlight drive circuit output terminal, the electric charge of depositing in backlight drive circuit is discharged.Therefore, the technical scheme that the embodiment of the present invention provides no longer affects back light because of the electric charge of depositing in backlight drive circuit after shutting down, and has eliminated the ghost phenomena of display screen after shutdown.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a part of the present invention, does not form limitation of the invention.In the accompanying drawings:
Shown in Fig. 1 is liquid crystal display backlight drive circuit schematic diagram in prior art;
Shown in Fig. 2 is that in prior art, liquid crystal display backlight drive circuit disconnects the schematic diagram of the variation of rear supply voltage and back light voltage at power supply;
Shown in Fig. 3 is display backlight control circuit schematic diagram in the embodiment of the present invention one;
Shown in Fig. 4 is liquid crystal screen backlight control circuit schematic diagram in the embodiment of the present invention two;
Shown in Fig. 5 is liquid crystal screen backlight control circuit schematic diagram in the embodiment of the present invention three;
Shown in Fig. 6 is display device schematic diagram in the embodiment of the present invention five;
Shown in Fig. 7 is display backlight control method schematic flow sheet in the embodiment of the present invention six.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is carried out more in detail and complete explanation.Be understandable that, specific embodiment described herein is only for explaining the present invention, but not limitation of the invention.It also should be noted that, for convenience of description, in accompanying drawing, only show part related to the present invention but not full content.
Shown in Fig. 3 is display backlight control circuit schematic diagram in the embodiment of the present invention one.As shown in Figure 3, display backlight control circuit comprises discharge circuit 202 and on-off circuit 203; In Fig. 3, also show backlight drive circuit 201 and back light 204 simultaneously.
The first end of discharge circuit 202 is for being connected with the output terminal of backlight drive circuit 201, and the second end of discharge circuit 202 is for being connected with ground wire.
The first end of on-off circuit 203 is for being connected with the output terminal of backlight drive circuit 201, and the second end of on-off circuit 203 is for being connected with the input end of back light 204, and the 3rd end of on-off circuit 203 is for being connected with shutdown control signal wire; And on-off circuit 203 is according to signal closes or disconnection on shutdown control signal wire.Concrete, the pass machine control signal of the control signal wire that shuts down in the present embodiment can be to provide the supply voltage to backlight drive circuit, can also be the system voltage of whole system; Can also be simultaneously supply voltage and system voltage after certain processing, form with supply voltage or the synchronous signal of system voltage, and this signal can make on-off circuit 203 closures when start, makes on-off circuit 203 disconnections during shutdown.Wherein, closure refers to on-off circuit unlatching or conducting etc., and disconnection refers to the cut-off of on-off circuit etc.,
In the present embodiment, discharge circuit 202 adopts high impedance device, so that after start, display screen is when normal display state, the shunting of driving voltage that the supply voltage that power supply voltage signal line provides provides through backlight drive circuit 201 is very little, and from driving voltage is normally lighted or driven, back light is luminous can not have much impact.
In the present embodiment, on-off circuit 203 adopts the three terminal device with switch character, for example field effect transistor (Metal Oxide Semiconductor, MOS), bipolar transistor (Bipolar Junction Transistor, BJT) etc.Wherein, there is the first end of three terminal device of switch character for being connected with the output terminal of backlight drive circuit 201, the second end is for being connected with the input end of back light 204, and the 3rd end is for being connected with the shutdown control signal wire that closes machine control signal is provided.When pass machine control signal acts on the 3rd end of three terminal device, close machine control signal and control three terminal device disconnection, and then the impact of the electric capacity of depositing because of a variety of causes that stops afterwards backlight drive circuit 201 in shutdown on backlight electric power, and then can effectively eliminate the ghost of display screen after shutdown.Concrete, in the present embodiment, when the pass of on-off circuit 203 machine control signal is the supply voltage of backlight drive circuit 201, after start, supply voltage acts on backlight drive circuit 201 and on-off circuit 203 simultaneously.Because of supply voltage act on on-off circuit 203 and when when shutdown supply voltage disconnect, thereby the three terminal device with switch character is done the used time in conducting state at supply voltage, at supply voltage, does not do the used time in cut-off state.
Alternatively, the signal shutting down in the present embodiment on control signal wire is voltage signal; That is to say that supply voltage acts on on-off circuit 203 simultaneously.
Alternatively, the control signal wire that shuts down in the present embodiment is connected with the power supply voltage signal line of backlight drive circuit 201.Under this kind of connected mode, the power supply that pass machine control signal is controlled backlight drive circuit simultaneously provides with the closed of gauge tap circuit or disconnects; Make also cut-off switch circuit in shutdown, the impact of the electric charge of depositing because of a variety of causes in reducing backlight drive circuit on back light, when effectively eliminating the rear ghost of display screen shutdown, the control signal wire that makes to shut down is connected with power supply voltage signal line, has reduced FPC(flexible PCB) expense.
Alternatively, in the present embodiment, discharge circuit 202 is a resistor, and the first end of resistor is for being connected with the output terminal of backlight drive circuit 201, and the second end of resistor is for being connected with ground wire.
At display screen, normally show the stage, on-off circuit 203 is in opening.Power supply forms driving voltage after backlight drive circuit 201, and the on-off circuit 203 of driving voltage through opening provides voltage to back light 204, so that back light 204 is luminous, to display screen, provides light source so that it shows image etc.Meanwhile, supply voltage acts on on-off circuit 203, makes on-off circuit 203 in closure state.When shutdown, closing machine control signal disconnects supply voltage, because the supply voltage applying on on-off circuit 203 disconnects, even if the supply voltage being also applied on on-off circuit 203 makes zero, and then on-off circuit 203 is disconnected, the electric charge of now depositing because of a variety of causes in backlight drive circuit 201 discharges through discharge circuit 202, thereby has eliminated the ghost effect that in backlight drive circuit 201, spurious charge produces after shutdown in display screen.
The display backlight driving circuit providing in the present embodiment, after shutdown, the pass machine control signal gauge tap circuit that shutdown control signal wire provides disconnects; And in shutdown, the electric charge of depositing after shutdown in backlight drive circuit can not transfer to back light by on-off circuit again, but by the discharge circuit being connected with backlight drive circuit output terminal, the electric charge of depositing in backlight drive circuit is discharged.Therefore, the technical scheme that the embodiment of the present invention provides no longer affects back light because of the electric charge of depositing in backlight drive circuit after shutting down, and has eliminated the ghost phenomena of display screen after shutdown.
Shown in Fig. 4 is LCD backlight control circuit schematic diagram in the embodiment of the present invention two; The present embodiment be take liquid crystal display and is described as example, and the enforcement of the present embodiment is with the basis that is illustrated as in embodiment mono-, to related notion and explain with reference to described in embodiment mono-, does not repeat them here.As shown in Figure 4, backlight control circuit comprises:
Discharge circuit 302 and NPN type BJT transistor 303 also show backlight drive circuit 301 and back light 304 in Fig. 2 simultaneously.
The first end of discharge circuit 302 is for being connected with the output terminal of backlight drive circuit 301, and the second end of discharge circuit 302 is for being connected with ground wire.
The collector of NPN type BJT transistor 303 is for being connected with the output terminal of backlight drive circuit 301, the emitter of NPN type BJT transistor 303 is for being connected with the input end of back light 304, and the base stage of NPN type BJT transistor 303 is for being connected with shutdown control signal wire; And NPN type BJT transistor 303 is according to signal conduction or cut-off on shutdown control signal wire.
Utilize the switch character of NPN type BJT transistor 303 using NPN type BJT transistor 303 as on-off circuit.For NPN type BJT transistor 303, under open state, when closing machine control signal while acting on base stage, providing the pass machine control signal that is greater than threshold voltage, NPN type BJT transistor 303 is in conducting state, and liquid crystal display normally shows image.When shutdown, while making to close machine control signal disconnection, 303 cut-offs of NPN type BJT transistor, thereby can realize, stop the electric charge of depositing because of a variety of causes when shutdown in backlight drive circuit 301 to transfer to back light 304, and then eliminate the ghost effect producing on liquid crystal display because depositing electric charge entry of backlight light source after shutdown.
Preferably, in the present embodiment, discharge circuit 302 is resistance, utilize resistance as the high impedance device of discharge circuit, interchange or the DC current that can form the stray capacitance forming in backlight drive circuit 301 effectively discharge, thereby eliminate the ghost effect producing in the rear liquid crystal display of shutdown.
At normal work stage NPN type BJT transistor 303 in conducting state.The power supply that power supply voltage signal line provides forms driving voltage after backlight drive circuit 301, the NPN type BJT transistor of driving voltage through opening provides voltage to back light, so that back light is luminous, and then provide light source so that it shows image etc. to liquid crystal display.When shutdown, the pass machine control signal that shutdown control signal wire provides disconnects, so that NPN type BJT transistor cut-off, the electric charge of now depositing in backlight drive circuit discharges through discharge circuit, thereby eliminated, deposits the ghost effect that electric charge produces after shutdown in liquid crystal display in backlight drive circuit.
The LCD backlight driving circuit providing in the present embodiment, after shutdown, the pass machine control signal that shutdown control signal wire provides is controlled NPN type BJT transistor and is disconnected; And in shutdown, the electric charge of depositing after shutdown in backlight drive circuit can not transfer to back light by NPN type BJT transistor again, and the resistance being connected with backlight drive circuit output terminal discharges the electric charge of depositing in backlight drive circuit simultaneously.Therefore, the technical scheme that the embodiment of the present invention provides no longer affects back light because of the electric charge of depositing in backlight drive circuit after shutting down, and has eliminated the ghost phenomena of liquid crystal display after shutdown.
Shown in Fig. 5 is liquid crystal screen backlight control circuit schematic diagram in the embodiment of the present invention three; The enforcement of the present embodiment is with the basis that is illustrated as in embodiment mono-, to related notion and explain with reference to described in embodiment mono-, do not repeat them here.As shown in Figure 5, backlight control circuit comprises:
Discharge circuit 402 and nmos pass transistor 403 also show backlight drive circuit 401 and back light 404 in Fig. 5 simultaneously.
The first end of discharge circuit 402 is for being connected with the output terminal of backlight drive circuit 401, and the second end of discharge circuit 402 is for being connected with ground wire;
NMOS(Negative channel-Metal-Oxide-Semiconductor, N-type metal-oxide semiconductor (MOS)) drain electrode of transistor 403 is for being connected with the output terminal of backlight drive circuit 401, the source electrode of nmos pass transistor 403 is for being connected with the input end of back light 404, the grid of nmos pass transistor 403 is for being connected with shutdown control signal wire, and nmos pass transistor 403 is according to signal conduction or cut-off on shutdown control signal wire.
Utilize the switch character of nmos pass transistor 403 using nmos pass transistor 403 as on-off circuit.For nmos pass transistor 403, when shutdown, the pass machine control signal that is applied to nmos pass transistor 403 disconnects, because closing on machine control signal disconnection nmos pass transistor 403, no longer apply voltage, nmos pass transistor 403 is in cut-off state, thereby can realize, stop the electric charge of depositing when shutdown in backlight drive circuit to transfer to back light, and then eliminate liquid crystal display in postboost ghost effect.
Preferably, in the present embodiment, discharge circuit 402 is resistance, utilize resistance as the high impedance device of discharge circuit, can effectively discharge interchange or the DC current of depositing electric charge formation that form in backlight drive circuit 401, thus the ghost effect of liquid crystal display after elimination shutdown.
At normal work stage nmos pass transistor 403 in conducting state.The power supply that power supply voltage signal line provides forms driving voltage after backlight drive circuit 401, the nmos pass transistor of driving voltage through opening provides voltage to back light 404, so that back light 404 is luminous, and then provide light source so that it shows image etc. to liquid crystal display.When shutdown, the pass machine control signal that is applied to nmos pass transistor 403 grids disconnects, so that nmos pass transistor 403 cut-offs, the electric charge of now depositing in backlight drive circuit 403 discharges through resistance 402, thereby eliminated, deposits the ghost effect that electric charge produces after shutting down in liquid crystal display in backlight drive circuit 401.
The liquid crystal display backlight drive circuit providing in the present embodiment, after shutdown, the pass machine control signal that shutdown control signal wire provides is controlled nmos pass transistor and is disconnected; And in shutdown, the electric charge of depositing after shutdown in backlight drive circuit can not transfer to back light by nmos pass transistor again, but by the resistance being connected with backlight drive circuit output terminal, the electric charge of depositing in backlight drive circuit is discharged.Therefore, the technical scheme that the embodiment of the present invention provides no longer affects back light because of the electric charge of depositing in backlight drive circuit after shutting down, and has eliminated the ghost phenomena of liquid crystal display after shutdown.
One to embodiment tri-explanation in conjunction with the embodiments, the present invention also provides the 4th embodiment to describe display backlight Driving technique scheme of the present invention.
Discharge circuit selects transistor device to form in the present embodiment, bipolar transistor, nmos pass transistor, PMOS transistor and field effect transistor (Field Effect Transistor for example, FET) etc., on-off circuit is to select wherein one or several in one or more to interconnect the high impedance circuit of composition.The high impedance circuit that the embodiment of the present invention utilizes transistor to form, discharges the electric charge in backlight drive circuit when on-off circuit closes to have no progeny.Therefore, the technical scheme that the embodiment of the present invention provides no longer affects back light because of the electric charge of depositing in backlight drive circuit after shutting down, and has eliminated the ghost phenomena of liquid crystal display after shutdown.
Shown in Fig. 6 is display device schematic diagram in the embodiment of the present invention five; The enforcement of the present embodiment is with the basis that is illustrated as in embodiment mono-to embodiment tetra-, to related notion and explain with reference to described in embodiment mono-, do not repeat them here.Display device at least comprises as described in Figure 6:
Display screen 501, back light 502, display backlight control circuit 503 and backlight drive circuit 504.
Wherein, backlight drive circuit 504 provides driving voltage.
Back light 502 provides back light to drive or to light display screen 501.
Display screen 501 carries out the demonstration of image, picture etc.
Display backlight control circuit 503 utilizes the described display backlight control circuit in embodiment mono-to embodiment tetra-.
The display device providing in the present embodiment, after shutdown, the pass machine control signal gauge tap circuit that shutdown control signal wire provides disconnects; And in shutdown, the electric charge of depositing after shutdown in backlight drive circuit can not transfer to back light by on-off circuit again, but by the discharge circuit being connected with backlight drive circuit output terminal, the electric charge of depositing in backlight drive circuit is discharged.Therefore, the technical scheme that the embodiment of the present invention provides no longer affects back light because of the electric charge of depositing in backlight drive circuit after shutting down, and has eliminated the ghost phenomena of display screen after shutdown.
Shown in Fig. 7 is display backlight control method schematic diagram in the embodiment of the present invention six; The enforcement of the present embodiment is with the basis that is illustrated as in embodiment mono-to embodiment five, to related notion and explain with reference to described in embodiment mono-, do not repeat them here.As shown in Figure 7, in the present embodiment, display backlight control method comprises the steps:
Step 601, opening steps backlight.
In opening steps backlight, on-off circuit is according to the signal closes on described shutdown control signal wire, and the electric current of backlight drive circuit output offers back light via on-off circuit, and back light is lit.
Step 602, the step of closing backlight.
In the step of closing backlight, on-off circuit disconnects according to the signal on shutdown control signal wire, and back light no current is inputted and extinguished.
Step 603, discharge step.
In discharge step, on-off circuit disconnects according to the signal on shutdown control signal wire, and the residual charge on backlight drive circuit discharges via discharge circuit.
In the present embodiment, the explanation of related notion and explanation, with reference to above-described embodiment one to embodiment five, no longer illustrate in the present embodiment.
The display backlight control method providing in the present embodiment, after shutdown, the pass machine control signal gauge tap circuit that shutdown control signal wire provides disconnects; And in shutdown, the electric charge of depositing after shutdown in backlight drive circuit can not transfer to back light by on-off circuit again, but by the discharge circuit being connected with backlight drive circuit output terminal, the electric charge of depositing in backlight drive circuit is discharged.Therefore, the technical scheme that the embodiment of the present invention provides no longer affects back light because of the electric charge of depositing in backlight drive circuit after shutting down, and has eliminated the ghost phenomena of display screen after shutdown.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, to those skilled in the art, the present invention can have various changes and variation.All any modifications of doing, be equal to replacement, improvement etc., within protection scope of the present invention all should be included within spirit of the present invention and principle.
Claims (11)
1. a display backlight control circuit, is characterized in that, comprising: discharge circuit and on-off circuit; Wherein,
The first end of described discharge circuit is for being connected with the output terminal of backlight drive circuit, and the second end of described discharge circuit is for being connected with ground wire;
The first end of described on-off circuit is for being connected with the output terminal of described backlight drive circuit, and the second end of described on-off circuit is for being connected with the input end of back light, and the 3rd end of described on-off circuit is for being connected with shutdown control signal wire; And
Described on-off circuit is according to signal closes or disconnection on described shutdown control signal wire.
2. display backlight control circuit as claimed in claim 1, is characterized in that, the signal on described shutdown control signal wire is voltage signal.
3. display backlight control circuit as claimed in claim 2, is characterized in that, described shutdown control signal wire is connected with the power supply voltage signal line of backlight drive circuit.
4. display backlight control circuit as claimed in claim 1, is characterized in that, described discharge circuit is a resistor, and the first end of described resistor is for being connected with the output terminal of backlight drive circuit, and the second end of described resistor is for being connected with ground wire.
5. display backlight control circuit as claimed in claim 1, is characterized in that, described on-off circuit is a nmos pass transistor; Wherein, the drain electrode of described nmos pass transistor is for being connected with the output terminal of described backlight drive circuit, and the source electrode of described nmos pass transistor is for being connected with the input end of back light, and the grid of described nmos pass transistor is for being connected with shutdown control signal wire.
6. display backlight control circuit as claimed in claim 1, it is characterized in that, described on-off circuit is a NPN type BJT transistor, wherein, the transistorized collector of described NPN type BJT is for being connected with the output terminal of described backlight drive circuit, the transistorized emitter of described NPN type BJT is for being connected with the input end of back light, and the transistorized base stage of described NPN type BJT is for being connected with shutdown control signal wire.
7. a display device, is characterized in that comprising the arbitrary described display backlight control circuit of claim 1-6.
8. the display backlight control circuit of utilization as described in claim 1-6 any one carries out a display backlight control method, it is characterized in that, comprising: opening steps backlight, step and the discharge step of closing backlight.
9. display backlight control method as claimed in claim 8, it is characterized in that, in described opening steps backlight, described on-off circuit is according to the signal closes on described shutdown control signal wire, the electric current of described backlight drive circuit output offers described back light via described on-off circuit, and described back light is lit.
10. display backlight control method as claimed in claim 8, is characterized in that, in the described step of closing backlight, described on-off circuit disconnects according to the signal on described shutdown control signal wire, and described back light no current is inputted and extinguishes.
11. display backlight control methods as claimed in claim 8, it is characterized in that, in described discharge step, described on-off circuit disconnects according to the signal on described shutdown control signal wire, and the electric charge of depositing on described backlight drive circuit discharges via described discharge circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310698440.4A CN103927993B (en) | 2013-12-18 | 2013-12-18 | Display backlight control circuit, method and display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310698440.4A CN103927993B (en) | 2013-12-18 | 2013-12-18 | Display backlight control circuit, method and display device |
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| CN103927993A true CN103927993A (en) | 2014-07-16 |
| CN103927993B CN103927993B (en) | 2016-04-27 |
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| CN201310698440.4A Active CN103927993B (en) | 2013-12-18 | 2013-12-18 | Display backlight control circuit, method and display device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105206230A (en) * | 2015-10-09 | 2015-12-30 | 武汉华星光电技术有限公司 | Liquid crystal display backlight control circuit and terminal device |
| CN108461069A (en) * | 2018-05-16 | 2018-08-28 | 青岛海信电器股份有限公司 | A kind of multi partition backlight drive circuit and display device |
| US10834795B2 (en) | 2018-05-16 | 2020-11-10 | Hisense Visual Technology Co., Ltd. | Backlight drive circuit, backlight driving method, and display device |
| CN114968378A (en) * | 2021-02-23 | 2022-08-30 | 广州视源电子科技股份有限公司 | Control method, device, equipment and storage medium |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2745164Y (en) * | 2004-09-30 | 2005-12-07 | 四川长虹电器股份有限公司 | Circuit for suppressing scrambling screen display of LCD screen |
| JP2007287617A (en) * | 2006-04-20 | 2007-11-01 | Tamura Seisakusho Co Ltd | Driving circuit of light-emitting element and lighting system |
| CN101377906A (en) * | 2007-08-31 | 2009-03-04 | 北京京东方光电科技有限公司 | Apparatus for quickening power supply discharge rate |
| CN102682718A (en) * | 2012-05-11 | 2012-09-19 | 深圳市华星光电技术有限公司 | Backlight module of liquid crystal display screen and control method thereof |
| CN102842292A (en) * | 2011-06-24 | 2012-12-26 | 鸿富锦精密工业（深圳）有限公司 | Power supply management circuit and display device using same |
| CN202799274U (en) * | 2011-07-11 | 2013-03-13 | 罗姆股份有限公司 | LED drive device, illumination device and liquid crystal display device |
-
2013
- 2013-12-18 CN CN201310698440.4A patent/CN103927993B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2745164Y (en) * | 2004-09-30 | 2005-12-07 | 四川长虹电器股份有限公司 | Circuit for suppressing scrambling screen display of LCD screen |
| JP2007287617A (en) * | 2006-04-20 | 2007-11-01 | Tamura Seisakusho Co Ltd | Driving circuit of light-emitting element and lighting system |
| CN101377906A (en) * | 2007-08-31 | 2009-03-04 | 北京京东方光电科技有限公司 | Apparatus for quickening power supply discharge rate |
| CN102842292A (en) * | 2011-06-24 | 2012-12-26 | 鸿富锦精密工业（深圳）有限公司 | Power supply management circuit and display device using same |
| CN202799274U (en) * | 2011-07-11 | 2013-03-13 | 罗姆股份有限公司 | LED drive device, illumination device and liquid crystal display device |
| CN102682718A (en) * | 2012-05-11 | 2012-09-19 | 深圳市华星光电技术有限公司 | Backlight module of liquid crystal display screen and control method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105206230A (en) * | 2015-10-09 | 2015-12-30 | 武汉华星光电技术有限公司 | Liquid crystal display backlight control circuit and terminal device |
| CN108461069A (en) * | 2018-05-16 | 2018-08-28 | 青岛海信电器股份有限公司 | A kind of multi partition backlight drive circuit and display device |
| US10834795B2 (en) | 2018-05-16 | 2020-11-10 | Hisense Visual Technology Co., Ltd. | Backlight drive circuit, backlight driving method, and display device |
| CN114968378A (en) * | 2021-02-23 | 2022-08-30 | 广州视源电子科技股份有限公司 | Control method, device, equipment and storage medium |
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|---|---|
| CN103927993B (en) | 2016-04-27 |
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