CN106448575B - A kind of backlight adjusting method and backlight drive circuit - Google Patents
A kind of backlight adjusting method and backlight drive circuit Download PDFInfo
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- CN106448575B CN106448575B CN201610985855.3A CN201610985855A CN106448575B CN 106448575 B CN106448575 B CN 106448575B CN 201610985855 A CN201610985855 A CN 201610985855A CN 106448575 B CN106448575 B CN 106448575B
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000033228 biological regulation Effects 0.000 claims abstract description 44
- 238000005286 illumination Methods 0.000 claims abstract description 41
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 9
- 238000004146 energy storage Methods 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 230000002045 lasting effect Effects 0.000 claims 1
- 239000003990 capacitor Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 3
- 230000002459 sustained effect Effects 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 210000001367 artery Anatomy 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002688 persistence Effects 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—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
- G09G3/3413—Details of control of colour illumination sources
-
- 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
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/066—Adjustment of display parameters for control of contrast
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Liquid Crystal (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The embodiment of the invention discloses a kind of backlight adjusting method and backlight drive circuits.This method comprises: main control module determines that backlight regulates and controls the currently received pulse width modulation (PWM) signal dutyfactor of module after receiving the screen instruction of going out that triggering generates；If the pwm signal duty ratio, not higher than the duty cycle threshold of setting, main control module increases the pwm signal duty ratio inputted to backlight regulation module, and returns to execution duty ratio and determine operation；Otherwise, enable signal needed for main control module closes backlight to backlight regulation module input.Using this method, realizes and go out to the gradually adjusting of backlight backlight illumination when shielding, thus preferably solve the problems, such as to go out the splashette occurred when shielding.
Description
Technical field
The present embodiments relate to technical field of liquid crystal display more particularly to a kind of backlight adjusting methods and backlight drive electricity
Road.
Background technique
Currently, for showing equipment, show equipment be transformed by bright screen go out shield state when, typically directly pass through back
The enabled directly shutdown backlight of backlight in light drive circuit, causes screen directly to extinguish from bright state moment, due to human eye
Persistence of vision effect, be easy to cause the illusion of splashette to user, when especially screen intensity is higher, splashette problem is brighter
It is aobvious.In view of the above-mentioned problems, technical staff improves backlight drive circuit, thus the hair as backlight is controlled to adjust
The brightness of optical diode (Light Emitting Diode, LED).Currently, generalling use following two ways to realize backlight
The improvement of driving circuit, one is pulse widths to modulate (Pulse Width Modulation, PWM), and another kind is that simulation is adjusted
Light.
Fig. 1 gives the existing backlight drive circuit based on PWM regulation backlight illumination, in the backlight drive circuit,
Pwm signal can be generated by main control unit, then controlled by adjusting pwm signal duty ratio after screen instruction is gone out in sending
Thus enabled pin EN in backlight driving chip changes the virtual value of back facet current to gradually decrease backlight illumination until going out
Screen.The deficiency of this kind of mode is, since PWM directly controls enabled pin EN, pwm signal duty ratio less than 10% and
When pwm signal duty ratio is greater than 90%, it is unstable to there is a situation where that the back facet current of backlight driving chip exports, still having at this time can
Splashette can occur, so that the effective duty cycle range that the practical backlight of PWM is adjusted is 10% to 90%.
Fig. 2 gives the existing backlight drive circuit based on simulation light modulation and can send out in the backlight drive circuit
After the screen that goes out out instructs, by the way that DC voltage VDC is input to feedback pin FB, to control the output electric current of backlight driving chip,
Thus backlight illumination is gradually decreased until going out screen.The deficiency of this kind of mode is, needs to increase additional adjustable direct current
Voltage follower circuit thereby increases the complexity of entire backlight circuit.
Summary of the invention
The embodiment of the invention provides a kind of backlight adjusting method and backlight drive circuits, can effectively solve the problem that display equipment
The splashette problem occurred when being converted by bright screen to the screen that goes out.
On the one hand, the embodiment of the invention provides a kind of backlight adjusting methods, comprising:
After receiving the screen instruction of going out that triggering generates, main control module determines that backlight regulates and controls the currently received PWM of module
Signal dutyfactor；
If the pwm signal duty ratio increases not higher than the duty cycle threshold of setting, main control module to the back
Light regulates and controls the pwm signal duty ratio of module input, and returns and execute the determining operation of duty ratio；Otherwise, main control module is to described
Backlight regulates and controls enable signal needed for backlight is closed in module input.
On the other hand, the embodiment of the invention provides a kind of backlight drive circuits, including input filter, energy storage inductor
Device, output filter and backlight, further includes: main control module and backlight regulate and control module,
The main control module is connected with backlight regulation module, in the screen instruction of going out for receiving triggering generation
Afterwards, it determines and judges the backlight regulation currently received pwm signal duty ratio of module, and generate pwm signal or enabled letter
Number；
The backlight regulates and controls module, is connected with backlight, for regulating and controlling the backlight according to the pwm signal duty ratio of input
The backlight illumination in source, or the backlight is closed according to the enable signal of input.
A kind of backlight adjusting method and backlight drive circuit are provided in the embodiment of the present invention, this method is receiving triggering
After the screen instruction of going out generated, determine that backlight regulates and controls the currently received pwm signal duty ratio of module by main control module；When the PWM believes
Number duty ratio not higher than setting duty cycle threshold when, main control module increases the signal duty inputted to backlight regulation module
Than then returning and executing the determining operation of duty ratio；Otherwise, main control module case backlight regulation module input is closed needed for backlight
Enable signal.Using this method, realizes and go out when shielding to the gradually adjusting of backlight backlight illumination, thus preferably solve
It goes out the splashette problem occurred when shielding.
Detailed description of the invention
Fig. 1 gives the existing backlight drive circuit based on PWM regulation backlight illumination；
Fig. 2 gives the existing backlight drive circuit based on simulation light modulation；
Fig. 3 is a kind of flow diagram for backlight adjusting method that the embodiment of the present invention one provides；
Fig. 4 is a kind of flow diagram of backlight adjusting method provided by Embodiment 2 of the present invention；
Fig. 5 a is a kind of structural block diagram for backlight drive circuit that the embodiment of the present invention three provides；
Fig. 5 b gives a kind of exemplary circuit structure chart of backlight drive circuit of the offer of the embodiment of the present invention three.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limiting the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
Embodiment one
Fig. 3 is a kind of flow diagram for backlight adjusting method that the embodiment of the present invention one provides, and is suitable for display equipment
Screen the case where shielding of going out is become from bright screen, this method can be executed by backlight drive circuit, and wherein the backlight drive circuit can
By software and or hardware realization, and it is typically integrated in display equipment.
As shown in Figure 1, a kind of backlight adjusting method that the embodiment of the present invention one provides, including operate as follows:
S101, receive triggering generate go out screen instruction after, main control module determine backlight regulation module currently receive
Pwm signal duty ratio.
Generally, display equipment can be the electronic equipment with backlight, and backlight can be LED light, and display is set
Standby can be equivalent to by the state conversion of bright screen to the screen that goes out switchs to off-position, and this by energized state as the LED light of backlight
Show that equipment can be by the control for screen instruction of going out by the state conversion of bright screen to the screen that goes out in embodiment, wherein going out screen instruction can be with
It is triggered and is generated by user, illustratively, as user triggers lock-screen or closes the physical button of display equipment；It can also be by showing
Show that system itself triggering of equipment generates, illustratively, such as shows that equipment reaches the system trigger after locking screen automatically the time.This reality
Applying example can be after receiving the screen that goes out and instructing, and starting backlight illumination is adjusted, and is thus converted to the splashette gone out when shielding to solve bright screen
Problem.
In the present embodiment, main control module and backlight regulation module are to execute the backlight of the present embodiment backlight adjusting method
Functional module in driving circuit, pwm signal duty ratio specifically can be regarded as having electric signal in a pwm pulse signal period
The ratio between the signal for exporting time and entire signal period, based on the adjustable backlight of pwm signal duty ratio in the present embodiment
Backlight illumination, and pwm signal duty ratio is higher, backlight illumination is weaker.
Specifically, after receiving the screen that goes out and instructing, it can determine that backlight regulation module is current by main control module first
Received pwm signal duty ratio.It generally, can be electric within the pulse period by the current produced pwm signal of main control module
The output rule of ordinary mail number, to determine backlight regulation module currently corresponding pwm signal duty ratio.
If S102, pwm signal duty ratio increase not higher than the duty cycle threshold of setting, main control module to backlight tune
The pwm signal duty ratio of module input is controlled, and returns and executes the determining operation of duty ratio；Otherwise, main control module regulates and controls to backlight
Enable signal needed for backlight is closed in module input.
Occur splashette when shielding in order to avoid going out, then can turn off backlight again by first reducing the backlight illumination of backlight
The mode in source solves.Since the value of pwm signal duty ratio is higher, the backlight illumination of backlight is weaker, it is possible thereby to consider to pass through
Pwm signal duty ratio is increased to gradually decrease backlight illumination.In the present embodiment, duty cycle threshold specifically can be regarded as going out when shielding
It is not in the critical value of the pwm signal duty ratio of splashette, it is to be understood that for different display equipment, this is accounted for
Sky is not more identical than the value of threshold value, if the screen of display equipment is larger, the value of the duty cycle threshold is higher, therefore,
Historical experience value when shielding that can be gone out according to display equipment sets the duty cycle threshold.
After determining the backlight regulation currently received pwm signal duty ratio of module based on step S101, it is possible to determine that current
Pwm signal duty ratio whether be not higher than the duty cycle threshold of setting, and corresponding operation can be carried out based on result is determined.Tool
Body, it can be increased by main control module when current pwm signal duty ratio is not higher than duty cycle threshold and input to back
Light regulates and controls the pwm signal duty ratio of module, then returns to the size of pwm signal duty ratio and duty cycle threshold after determining to increase
Relationship；It can also be that backlight regulates and controls module by main control module when current pwm signal duty ratio is higher than duty cycle threshold
Enable signal needed for closing backlight is provided, so that backlight regulates and controls the closing behaviour that module carries out backlight based on the enable signal
Make.
In the present embodiment, when pwm signal duty ratio is higher than duty cycle threshold, the backlight illumination of backlight is weaker, quite
It is not in therefore the primary condition of splashette directly can turn off backlight by enable signal when meeting and going out and shield.This
Outside, it is to be understood that backlight regulation module can adjust backlight according to the received pwm signal duty ratio of institute in the present embodiment
The backlight illumination in source can also turn off backlight according to the received enable signal of institute, realize the screen that goes out of display equipment.
A kind of backlight adjusting method that the embodiment of the present invention one provides, after receiving the screen that goes out and instructing, if pwm signal accounts for
Sky then constantly increases pwm signal duty ratio than being not higher than duty cycle threshold, until pwm signal is higher than duty ratio, then provides pass
Enable signal needed for closing backlight.Using this method, realizes and go out to the gradually adjusting of backlight backlight illumination when shielding, thus
Preferably solve the problems, such as to go out the splashette occurred when shielding.
Embodiment two
Fig. 4 is a kind of flow diagram of backlight adjusting method provided by Embodiment 2 of the present invention, and the present embodiment is above-mentioned
It is optimized on the basis of embodiment, in the present embodiment, main control module is determined that backlight regulates and controls the currently received PWM of module
Signal dutyfactor, it is specific to optimize are as follows: main control module really believe according to the PWM that the main control module currently generates by order member
Number, determine that backlight regulates and controls the currently received pwm signal duty ratio of module.
On the basis of the above embodiments, which, which also optimizes, includes: the determination unit of main control module
Determine whether the pwm signal duty ratio is higher than setting duty cycle threshold.
Further, main control module is increased to the pwm signal duty ratio inputted to backlight regulation module, it is specific excellent
Turn to: the PWM signal generation unit of main control module generates pwm signal, and by increasing continuing for high level in the pulse period
Time increases the pwm signal duty ratio of the pwm signal inputted to backlight regulation module.
In addition, enabled letter needed for main control module is further closed backlight to backlight regulation module input
Number, optimization are as follows: the enable signal of main control module generates enable signal needed for unit generates closing backlight, and makes described
Energy signal is input to the backlight regulation module.
On the basis of the above embodiments, which also optimizes and increases: backlight regulation module according to
The pwm signal duty ratio of input regulates and controls the backlight illumination of the backlight；The backlight regulates and controls module according to the enabled letter of input
Number close the backlight.
As shown in figure 4, a kind of backlight adjusting method provided by Embodiment 2 of the present invention, including operate as follows:
S201, receive triggering generate go out screen instruction after, execute step S202.
Illustratively, it is believed that it is received go out screen instruction be equivalent to the present embodiment backlight adjusting method triggering starting
Instruction.
S202, the main control module pwm signal that order member is currently generated according to the main control module really, determine backlight
Regulate and control the currently received pwm signal duty ratio of module.
In the present embodiment, determination unit is one of functional unit of main control module in backlight drive circuit, can
For determining current pwm signal duty ratio.Preferably, the PWM which can be current produced by main control module
Signal realizes the determination of pwm signal duty ratio, specifically, it is determined that unit can be by current produced pwm signal in arteries and veins
The duration of high level signal in the period is rushed to determine current corresponding pwm signal duty ratio, and by the pwm signal duty ratio
Regulate and control the currently received pwm signal duty ratio of module as backlight.
S203, determine whether pwm signal duty ratio is not higher than duty cycle threshold, if so, thening follow the steps S204；If it is not,
Then follow the steps S206.
Illustratively, the determination unit of main control module can also account for identified pwm signal duty ratio with what is set
Sky is compared than threshold value, so that main control module is based on comparison result and carries out corresponding operation.
The PWM signal generation unit generation pwm signal of S204, main control module, and by increasing high electricity in the pulse period
The flat duration increases the pwm signal duty ratio of the pwm signal inputted to backlight regulation module.
In the present embodiment, PWM signal generation unit is another functional unit of main control module, for generating PWM
Signal.When pwm signal duty ratio is less than or equal to duty cycle threshold, can be held by increasing high level in pwm pulse period
The continuous time generates the higher pwm signal of duty ratio, and the backlight that can be input to of generated pwm signal regulates and controls module.
S205, backlight regulation module regulate and control the backlight illumination of the backlight according to the pwm signal duty ratio of input, later
Return to step S202.
Illustratively, after the pwm signal duty ratio for increasing pwm signal based on step S204, backlight regulates and controls module can be with
The pwm signal is received, and reduces the backlight illumination of backlight based on the pwm signal duty ratio after increase.
S206, main control module enable signal generate unit generate close backlight needed for enable signal, and by institute
It states enable signal and is input to the backlight regulation module.
In the present embodiment, enable signal generates the another functional unit that unit is main control module, can generate closing
Enable signal needed for backlight.When pwm signal duty ratio is higher than duty cycle threshold, show that backlight illumination at this time can accord with
The not set of hanging scrolls part that goes out of splashette that goes out when shielding is closed, at this point, enable signal, which generates unit, can produce the enable signal of high level, and will
The enable signal is input to the backlight regulation module.
S207, backlight regulation module close the backlight according to the enable signal of input.
In the present embodiment, after backlight regulation module receives the enable signal of the high level, so that it may be made according to this
Can signal turn off backlight, it is final to realize the conversion of display device screen bright screen to the screen that goes out.
A kind of backlight adjusting method provided by Embodiment 2 of the present invention embodies the adjusting operation of backlight illumination, also has
Body specific closing opportunity of backlight.It, can be real based on pwm signal duty ratio after screen instruction is gone out in reception using this method
The adjusting of existing backlight illumination, and backlight can be turned off based on enable signal after backlight illumination reaches sets requirement, thus more preferably
The splashette occurred when shielding that solves the problems, such as to go out.
Embodiment three
Fig. 5 a is a kind of structural block diagram for backlight drive circuit that the embodiment of the present invention three provides.Suitable for showing equipment
Screen becomes the case where shielding of going out from bright screen, which can be implemented by software and/or hardware, and is typically integrated in display
In equipment.As shown in Figure 5 a, the backlight drive circuit include: input filter 51, energy-storage reactor 52, output filter 53 with
And backlight 54, further includes: main control module 55 and backlight regulate and control module 56.
Wherein, main control module 55 are connected with backlight regulation module 56, in the screen instruction of going out for receiving triggering generation
Afterwards, it determines and judges that backlight regulates and controls the currently received pwm signal duty ratio of module 56, and generate pwm signal or enable signal.
Backlight regulates and controls module 56, is connected with backlight 54, for regulating and controlling backlight 54 according to the pwm signal duty ratio of input
Backlight illumination, or according to the enable signal of input close backlight 54.
In addition, for the other function module in the present embodiment backlight drive circuit, the first of input filter 51
External input voltage V_IN is held, second end is connect with the first end of energy-storage reactor 52, for being filtered behaviour to input voltage
Make；Energy-storage reactor 52 and backlight regulation module 56 are connected in parallel, meanwhile, the second end and output filter of energy-storage reactor 52
53 first end is connected, for carrying out boosting stored energy operation to backlight regulation module 56；The second end and back of output filter 53
The positive terminal of light source 54 is connected, for filtering the voltage of input backlight 54.
Backlight drive circuit provided in this embodiment, the backlight that backlight is gradually adjusted when can be entered by bright screen and be gone out and shielded are bright
Degree, thus preferably solve the problems, such as to go out the splashette occurred when shielding.
Further, Fig. 5 b gives a kind of exemplary circuit structure of backlight drive circuit of the offer of the embodiment of the present invention three
Figure, as shown in Figure 5 b, main control module 55 comprise determining that unit 551, PWM signal generation unit 552 and enable signal generate
Unit 553；Wherein it is determined that unit 551, the pwm signal for currently being generated according to the main control module, determine that backlight regulates and controls
The currently received pwm signal duty ratio of module；Determination unit 551 is also used to determine whether the pwm signal duty ratio is higher than and sets
Determine duty cycle threshold；PWM signal generation unit 552, for generating pwm signal, and by increasing high level in the pulse period
Duration increases the pwm signal duty ratio of the pwm signal inputted to backlight regulation module；Enable signal generates unit
553, backlight regulation module 56 is input to for enable signal needed for generating closing backlight 54, and by enable signal.
Further, as shown in Figure 5 b, backlight regulate and control module 56, comprising: overshoot protection device 561, pulsewidth filter 562,
Backlight driving chip 563, backlight illumination modulator 564 and back facet current limiter 565；
Wherein, overshoot protection device 561, external main control module 55, for preventing enable signal overshoot to backlight drive core
The damage of piece 563；Pulsewidth filter 562, external main control module 55, the pwm signal filter for inputting main control module 55
Wave is direct current input；Backlight driving chip 563, including enabled pin EN and feedback pin FB, enable pin EN and overshoot protection
The output end of device 561 is connected, for receiving the enable signal after overshoot protection；Feedback pin FB passes through backlight illumination modulator
564 are connected with the output end of pulsewidth filter 562, for according to the pwm signal duty of pwm signal after filtering when backlight illumination
The backlight illumination of the adjusting backlight 54 of modulator 564；The feedback of backlight illumination modulator 564, connection backlight driving chip 563 is drawn
Foot FB, for adjusting the output voltage of feedback pin FB；Back facet current limiter 565 connect with the cathode of backlight 54, is used for
Expand the adjustable back facet current range of backlight 54.
Specifically, as shown in Figure 5 b, the voltage input end of backlight drive circuit connects power supply V_IN, voltage output to back
The anode of light source 54 and cathode both ends；In the backlight drive circuit, input filter 51 include in parallel first capacitor C1 and
Second capacitor C2, and be grounded after the parallel connection of two capacitors；Energy-storage reactor 52 includes concatenated inductor L1 and sustained diode 1；It is defeated
Filter 53 includes third capacitor C3 and the 4th capacitor C4 in parallel out, and is also grounded after the parallel connection of two capacitors, meanwhile, output filtering
Device 53 is connect with the positive terminal of backlight 54.
In order to which the backlight illumination of backlight 54 can be regulated and controled when going out and shielding, main control module 55 and backlight regulation mould are increased
Block 56, specifically, as shown in Figure 5 b, it includes six pins that backlight, which regulates and controls the backlight driving chip 563 in module 56, respectively defeated
Enter pin IN, switched pins SW, overvoltage protection pin OV, grounding pin GND, enabled pin EN and feedback pin FB, wherein
Input pin IN is connected with the current output terminal of input filter 51, is used for 563 input voltage of backlight driving chip；Conversion is drawn
Foot SW is connected with the current output terminal of inductor L1, for reversing the current direction for being input to sustained diode 1；Overvoltage protection
Pin OV is connected with the current output terminal of sustained diode 1, for protecting the input voltage of backlight 54；Grounding pin GND connects
Ground；Enabled pin EN generates unit 553 with the enable signal in main control module 55 by overshoot protection device 561 and is connected, and is used for
Enable signal after receiving overshoot protection, and backlight 54 is closed based on enable signal；Feedback pin FB is then by pwm signal duty
The control of ratio realizes the adjusting of 54 backlight illumination of backlight by configuring backlight illumination modulator 564.
Specifically, one end of overshoot protection device 561 generates unit 553 with the enable signal in main control module 55 and is connected,
The other end is connected with enabled pin EN, for preventing enable signal overshoot from damaging to backlight driving chip 563, wherein mistake
One end is connected with first resistor R1 after the second resistance R2 rushed in protector 561 is in parallel with the 5th capacitor C5, other end ground connection.
In the present embodiment, the pwm signal passages through which vital energy circulates first that the PWM signal generation unit 552 in main control module 55 generates
Wide filter 562 filters, and is then connected with feedback pin FB, feedback pin FB is bright to backlight by the control of pwm signal duty ratio
Degree modulator 564 is configured, and to adjust the backlight voltage for being input to 54 negative pole end of backlight, it is bright to reach control backlight backlight
The purpose of degree.Wherein, pulsewidth filter 562 includes concatenated 3rd resistor R3 and the 6th capacitor C6, and the 6th capacitor C6's is another
One end ground connection；Backlight illumination modulator 564 includes concatenated 4th resistance R4 and the 5th resistance R5, and backlight illumination modulator
564 are connected with feedback pin FB, while being connected with one end of back facet current limiter 565, bright with the backlight for controlling backlight 54
Degree.In addition, the other end of back facet current limiter 565 is connect with the cathode of backlight 54, including the 6th resistance R6 in parallel and
7th resistance R7, and be grounded after two resistor coupled in parallel, it can be used for expanding the adjustable back facet current range of backlight.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above embodiments to the present invention
It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also
It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (9)
1. a kind of backlight adjusting method characterized by comprising
After receiving the screen instruction of going out that triggering generates, main control module determines that backlight regulates and controls the currently received pulse width of module
Modulation (PWM) signal dutyfactor；
If the pwm signal duty ratio increases not higher than the duty cycle threshold of setting, main control module to the backlight tune
The pwm signal duty ratio of module input is controlled, and returns and executes the determining operation of duty ratio；Otherwise, main control module is to the backlight
Regulate and control enable signal needed for backlight is closed in module input；
Wherein, the duty cycle threshold be go out be not in when shielding splashette pwm signal duty ratio critical value.
2. the method according to claim 1, wherein main control module determines that backlight regulation module is currently received
Pulse width modulation (PWM) signal dutyfactor, comprising:
The main control module pwm signal that order member is currently generated according to the main control module really determines that backlight regulates and controls module
Currently received pwm signal duty ratio.
3. according to the method described in claim 2, it is characterized by further comprising:
The determination unit of main control module determines whether the pwm signal duty ratio is higher than setting duty cycle threshold.
4. the method according to claim 1, wherein main control module increases to backlight regulation module input
Pwm signal duty ratio, comprising:
The PWM signal generation unit of main control module generates pwm signal, and by increase high level in the pulse period it is lasting when
Between come increase to the backlight regulation module input the pwm signal pwm signal duty ratio.
5. the method according to claim 1, wherein main control module is closed to backlight regulation module input
Enable signal needed for backlight, comprising:
The enable signal of main control module generate unit generate close backlight needed for enable signal, and by the enable signal
It is input to the backlight regulation module.
6. -5 any method according to claim 1, which is characterized in that further include:
The backlight regulation module regulates and controls the backlight illumination of the backlight according to the pwm signal duty ratio of input；
The backlight regulation module closes the backlight according to the enable signal of input.
7. a kind of backlight drive circuit, comprising: input filter, energy-storage reactor, output filter and backlight, feature
It is, further includes: main control module and backlight regulate and control module,
The main control module is connected with backlight regulation module, after instructing in the screen that goes out for receiving triggering generation, really
It is fixed and judge the backlight regulation currently received pulse width modulation (PWM) signal dutyfactor of module, and generate pwm signal or
Enable signal；
The main control module, if be also used to the pwm signal duty ratio not higher than setting duty cycle threshold, increase to
The pwm signal duty ratio of the backlight regulation module input, and return and execute the determining operation of duty ratio；Otherwise, main control module
Enable signal needed for closing backlight to backlight regulation module input；
Wherein, the duty cycle threshold be go out be not in when shielding splashette pwm signal duty ratio critical value；
The backlight regulates and controls module, is connected with backlight, for regulating and controlling the backlight according to the pwm signal duty ratio of input
Backlight illumination, or the backlight is closed according to the enable signal of input.
8. backlight drive circuit according to claim 7, which is characterized in that the main control module, comprising: determine single
Member, PWM signal generation unit and enable signal generate unit；
The determination unit, the pwm signal for currently being generated according to the main control module determine that backlight regulation module is current
Received pwm signal duty ratio；It is also used to determine whether the pwm signal duty ratio is higher than setting duty cycle threshold；
The PWM signal generation unit, for generating pwm signal, and the duration by increasing high level in the pulse period
To increase the pwm signal duty ratio of the pwm signal inputted to backlight regulation module；
The enable signal generates unit, for enable signal needed for generating closing backlight, and the enable signal is defeated
Enter to the backlight and regulates and controls module.
9. backlight drive circuit according to claim 7, which is characterized in that the backlight regulates and controls module, comprising: overshoot is protected
Protect device, pulsewidth filter, backlight driving chip, backlight illumination modulator and back facet current limiter；
The overshoot protection device, the external main control module, for preventing enable signal overshoot to the backlight driving chip
Damage；
The pulsewidth filter, the external main control module, the pwm signal for inputting the main control module are filtered into
Direct current input；
The backlight driving chip, including enabled pin and feedback pin, the enabled pin it is defeated with the overshoot protection device
Outlet is connected, for receiving the enable signal after overshoot protection；The feedback pin passes through the backlight illumination modulator and institute
The output end for stating pulsewidth filter is connected, for according to the pwm signal duty of pwm signal after the filtering when backlight illumination tune
Control device adjusts the backlight illumination of the backlight；
The backlight illumination modulator, connects the feedback pin of the backlight driving chip, for adjusting the feedback pin
Output voltage；
The back facet current limiter, connect with the cathode of the backlight, for expanding the adjustable back facet current of backlight
Range.
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| CN201610985855.3A CN106448575B (en) | 2016-11-09 | 2016-11-09 | A kind of backlight adjusting method and backlight drive circuit |
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| CN201610985855.3A CN106448575B (en) | 2016-11-09 | 2016-11-09 | A kind of backlight adjusting method and backlight drive circuit |
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| CN109119031B (en) * | 2018-09-07 | 2020-01-31 | 广州视源电子科技股份有限公司 | method, device and electronic equipment for controlling output brightness of display screen |
| CN116168654A (en) * | 2023-04-14 | 2023-05-26 | 杭州凡诺电子有限公司 | Display screen backlight control circuit, display screen and electronic equipment |
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| CN101751862A (en) * | 2008-11-28 | 2010-06-23 | 佛山市顺德区顺达电脑厂有限公司 | Device for controlling luminance of backlight source and control method thereof |
| CN101430863B (en) * | 2008-12-02 | 2010-12-01 | 晋城市环球利特光电技术有限公司 | Led back light source driving circuit |
| US20110249035A1 (en) * | 2008-12-26 | 2011-10-13 | Sharp Kabushiki Kaisha | Liquid crystal display device and television receiver |
| CN201622822U (en) * | 2009-06-22 | 2010-11-03 | 比亚迪股份有限公司 | Backlight regulating circuit |
| KR101289651B1 (en) * | 2010-12-08 | 2013-07-25 | 엘지디스플레이 주식회사 | Liquid crystal display and scanning back light driving method thereof |
| CN103440848B (en) * | 2013-09-02 | 2016-01-20 | 深圳市华星光电技术有限公司 | Backlight drive circuit |
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Effective date of registration: 20231117 Address after: Room 1102, 11/F, Building (1), No. 6, Yunpu 4th Road, Huangpu District, Guangzhou City, Guangdong Province, 510530 Patentee after: Guangzhou Xibeisi Intelligent Technology Co.,Ltd. Address before: 510530 No. 6, Yunpu Fourth Road, Yunpu Industrial Park, Huangpu District, Guangzhou City, Guangdong Province Patentee before: Guangzhou Shiyuan Electronic Technology Company Limited |