CN109523957A - drive circuit, backlight module and display panel - Google Patents
drive circuit, backlight module and display panel Download PDFInfo
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- CN109523957A CN109523957A CN201811579749.0A CN201811579749A CN109523957A CN 109523957 A CN109523957 A CN 109523957A CN 201811579749 A CN201811579749 A CN 201811579749A CN 109523957 A CN109523957 A CN 109523957A
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- 230000001105 regulatory effect Effects 0.000 claims abstract description 39
- 230000005611 electricity Effects 0.000 claims description 14
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- 230000003760 hair shine Effects 0.000 claims 1
- 230000033228 biological regulation Effects 0.000 description 4
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- 238000010586 diagram Methods 0.000 description 4
- 239000010408 film Substances 0.000 description 4
- 238000005286 illumination Methods 0.000 description 4
- 230000032683 aging Effects 0.000 description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
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- 230000007423 decrease Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 1
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- 210000002858 crystal cell Anatomy 0.000 description 1
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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
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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]
- H05B45/10—Controlling the intensity of the light
-
- 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
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- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The application relates to a driving circuit, a backlight module and a display panel. The driving circuit comprises a control circuit and a voltage regulating circuit. The first input end of the control circuit is connected with the high-level voltage signal, the second input end of the control circuit is connected with the reference voltage signal, the third input end of the control circuit is grounded and used for receiving the high-level voltage signal and the reference voltage signal, the resistance value of the control circuit is adjusted according to the brightness of the external environment, and the control signal is generated according to the adjusted resistance value, the high-level voltage signal and the reference voltage signal. The first input end of the voltage regulating circuit is connected with the output end of the control circuit, the second input end of the voltage regulating circuit is connected with the power supply voltage, and the third input end of the voltage regulating circuit is grounded and used for receiving the control signal and the power supply voltage and generating the working voltage according to the control signal and the power supply voltage, so that the luminous light source can regulate the self brightness according to the working voltage and the difference between the self brightness and the environment brightness is reduced.
Description
Technical field
This application involves display field more particularly to a kind of driving circuits, backlight module and display panel.
Background technique
Thin film transistor liquid crystal display (Thin Film Transistor Liquid Crystal Display, TFT-
LCD) panel is one of the major product that current flat panel is shown, has become weight in present information scientific and technological industry and video product
The display platform wanted.In the TFT-LCD display panel course of work, power supply mainly is provided by the driving chip on printed circuit board
With signal to display area, to realize that image is shown.
At present in display panel, used backlight illumination be all it is fixed, can not change with the change of ambient light, institute
Brightness will be generated by stating between display panel and external environment goes out difference, and luminance difference then can generate damage to human eye.
Summary of the invention
Based on this, it is necessary to current display panel can not adjust automatically brightness aiming at the problem that, provide a kind of driving electricity
Road, backlight module and display panel.
This application provides a kind of driving circuits, comprising:
Control circuit, first input end are connect with high level voltage signal, and the second input terminal connects reference voltage signal, the
Three input end groundings, for receiving the high level voltage signal and the reference voltage signal, according to external environment brightness tune
Itself whole resistance value generates control according to resistance value adjusted and the high level voltage signal and the reference voltage signal
Signal；And
Regulating circuit, first input end are connect with the output end of the control circuit, and the second input terminal and supply voltage connect
It connects, third input end grounding, for receiving the control signal and the supply voltage, and according to the control signal and described
Supply voltage generates operating voltage.
In some embodiments provided by the present application, the control circuit includes:
First partial pressure branch, first input end are connect with the high level voltage signal, the second input end grounding, for connecing
The high level voltage signal is received, according to the resistance value of the external environment brightness adjustment itself, according to itself resistance adjusted
Value and the high level voltage signal generate feedback voltage；And
Compare branch, first input end is connect with the reference voltage signal, the second input terminal and the first partial pressure branch
Road connection, for receiving the reference voltage signal and the feedback voltage, and according to the reference voltage signal and described anti-
Feedthrough voltage generates control signal.
In some embodiments provided by the present application, the regulating circuit includes:
Switching branches, the output end connection of first input end branch compared with described, the second input terminal and power supply electricity
Pressure connection, third input end grounding, output end is connect with illuminating source, for receiving the control signal, and according to the control
Signal processed is exported using the supply voltage as the operating voltage to the illuminating source；And
Second partial pressure branch, input terminal is connect with the second input terminal of the supply voltage and the switching branches, defeated
Outlet is connect with the output end of the switching branches and the illuminating source.
In some embodiments provided by the present application, the first partial pressure branch includes:
First resistor, first end are connect with the high level voltage signal, second one end compared with described branch second
Input terminal connection, the first resistor are photo resistance；And
Second resistance, first end and the second end of the first resistor and it is described compared with the second input terminal of branch connect
It connects, second end ground connection.
In some embodiments provided by the present application, the relatively branch includes:
Comparator, positive input are connect with the reference voltage signal, and the of negative input and the first resistor
The connection of the first end of two ends and the second resistance, output end are connect with the first input end of the switching circuit.
In some embodiments provided by the present application, the switching branches include:
Switching tube, grid are connect with the output end of the comparator, and source electrode is connect with the supply voltage, drain electrode with it is described
Illuminating source connection；And
3rd resistor, first end are connect with the grid of the output end of the comparator and the switching tube, the second termination
Ground.
In some embodiments provided by the present application, second bleeder circuit includes:
4th resistance, first end are connect with the source electrode of the supply voltage and the switching tube, and second end is opened with described
Close the drain electrode and illuminating source connection of pipe.
Based on the same inventive concept, present invention also provides backlight modules, comprising:
LED light string, including multiple LED light, for providing light source；And
Driving circuit is connect with the LED light string, for powering for the LED light string；
Wherein, the driving circuit includes:
Control circuit, first input end are connect with high level voltage signal, and the second input terminal connects reference voltage signal, the
Three input end groundings, for receiving the high level voltage signal and the reference voltage signal, according to external environment brightness tune
Itself whole resistance value generates control according to resistance value adjusted and the high level voltage signal and the reference voltage signal
Signal；And
Regulating circuit, first input end are connect with the output end of the control circuit, and the second input terminal and supply voltage connect
It connects, third input end grounding, for receiving the control signal and the supply voltage, according to the control signal and the electricity
Source voltage generates operating voltage, and exports to the LED light string.
In some embodiments provided by the present application, the driving circuit is specifically included:
First resistor, first end are connect with the high level voltage signal, and the first resistor is photo resistance；
Second resistance, first end are connect with the second end of the first resistor, second end ground connection；
Comparator, positive input are connect with the reference voltage signal, and the of negative input and the first resistor
The connection of the first end of two ends and the second resistance；
Switching tube, grid are connect with the output end of the comparator, and source electrode is connect with the supply voltage, drain electrode with it is described
LED light string connection；
3rd resistor, first end are connect with the grid of the output end of the comparator and the switching tube, the second termination
Ground；And
4th resistance, first end are connect with the source electrode of the supply voltage and the switching tube, and second end is opened with described
Close the drain electrode and LED light string connection of pipe.
Based on the same inventive concept, present invention also provides a kind of display panel, the display panel includes:
Display area, for being shown；With
Peripheral circuit area matches setting with the display area, for powering and providing drive for the display area
Dynamic signal；
Wherein, the peripheral circuit area includes driving circuit, and the driving circuit includes:
Control circuit, first input end are connect with high level voltage signal, and the second input terminal connects reference voltage signal, the
Three input end groundings, for receiving the high level voltage signal and the reference voltage signal, according to external environment brightness tune
Itself whole resistance value generates control according to resistance value adjusted and the high level voltage signal and the reference voltage signal
Signal；And
Regulating circuit, first input end are connect with the output end of the control circuit, and the second input terminal and supply voltage connect
It connects, third input end grounding, for receiving the control signal and the supply voltage, and according to the control signal and described
Supply voltage generates operating voltage.
To sum up, the embodiment of the present application provides a kind of driving circuit, backlight module and display panel.The driving circuit packet
Include control circuit and regulating circuit.The first input end of the control circuit is connect with high level voltage signal, the control electricity
Second input terminal on road connects reference voltage signal, the third input end grounding of the control circuit, and the control circuit is used for
The high level voltage signal and the reference voltage signal are received, according to the resistance value of the external environment brightness adjustment itself,
Control signal is generated according to resistance value adjusted and the high level voltage signal and the reference voltage signal.The pressure regulation
The first input end of circuit is connect with the output end of the control circuit, the second input terminal and supply voltage of the regulating circuit
Connection, the third input end grounding of the regulating circuit, the regulating circuit is for receiving the control signal and the power supply
Voltage, and operating voltage is generated according to the control signal and the supply voltage.It is described in driving circuit provided by the present application
Control circuit is according to the resistance value of the external environment brightness adjustment itself, according to resistance value adjusted and the high level voltage
Signal and the reference voltage signal generate control signal, then by the regulating circuit according to the control signal and institute
Supply voltage generation operating voltage is stated to subtract so that the illuminating source can adjust the brightness of itself according to the operating voltage
Difference between small self brightness and ambient brightness.
Detailed description of the invention
Fig. 1 is the electrical structure schematic diagram of illustrative display panel；
Fig. 2 is a kind of electrical block diagram of driving circuit provided by the embodiments of the present application；
Fig. 3 is the positional structure schematic diagram of first resistor provided by the embodiments of the present application；
Fig. 4 is the connection equivalent circuit diagram of driving circuit provided by the embodiments of the present application and LED light string.
Drawing reference numeral explanation:
100 control circuits
110 first partial pressure branches
120 compare branch
200 regulating circuits
210 switching branches
220 second partial pressure branches
310 windows
R1 first resistor
R2 second resistance
R3 3rd resistor
The 4th resistance of R4
The equivalent resistance of Rled LED light string
D1 comparator
M1 switching tube
Specific embodiment
In order to make the above objects, features, and advantages of the present application more apparent, with reference to the accompanying drawing to the application
Specific embodiment be described in detail.Many details are explained in the following description in order to fully understand this Shen
Please.But the application can be implemented with being much different from other way described herein, those skilled in the art can be not
Similar improvement is done in the case where violating the application intension, therefore the application is not limited by following public specific implementation.
TFT-LCD display panel is one of the major product that current flat panel is shown, has become the production of present information science and technology
Important display platform in industry and video product.Referring to Figure 1, the main driving principle of TFT-LCD display panel includes: system
The data such as picture element signal and control signal and power supply are passed through wire rod and printed circuit board (Printed Circuit by mainboard
Board, PCB) on connector be connected, data by pcb board sequence controller (Timing Controller,
TCON) after integrated circuit processing, through pcb board, by source level film driving chip (Source-Chip on Film, S-COF) and
Grid film driving chip (Gate-Chip on Film, G-COF) is connect with viewing area, thus needed for obtaining viewing area
Power supply and data, to realize that image is shown.
But show during, the backlight illumination of the display panel be it is fixed, can not with the change of ambient light and from
It is dynamic to change, brightness will be generated between the display panel and external environment goes out difference, and luminance difference can then generate human eye
Damage.
But in process of production, display panel is easy to appear the problems such as liquid crystal cell line defect, electronic component slight damage,
These problems are easy to cause display panel flaw, such as broken string, corrosion occur in user's use process, seriously affect the matter of product
Amount, therefore need to carry out ageing management to test whether that there are these problems after the completion of the manufacture craft of display panel.But
Conventional ageing management design has been unable to satisfy client to the multifarious demand of voltage used during ageing management.
In view of the above-mentioned problems, the embodiment of the present application provides a kind of driving circuit.Refer to Fig. 2, the driving circuit packet
Include control circuit 100 and regulating circuit 200.
The first input end of the control circuit 100 is connect with high level voltage signal, and the second of the control circuit 100
Input terminal connects reference voltage signal, and the third input end grounding of the control circuit 100, the control circuit 100 is for connecing
The high level voltage signal and the reference voltage signal are received, according to the resistance value of external environment brightness adjustment itself, according to tune
Resistance value and the high level voltage signal and the reference voltage signal after whole generate control signal.
The first input end of the regulating circuit 200 is connect with the output end of the control circuit 100, the regulating circuit
200 the second input terminal is connect with supply voltage, the third input end grounding of the regulating circuit 200, the regulating circuit 200
Work electricity is generated for receiving the control signal and the supply voltage, and according to the control signal and the supply voltage
Pressure.
In the present embodiment, the control circuit 100 is according to the resistance value of the external environment brightness adjustment itself, according to adjustment
Resistance value and the high level voltage signal and the reference voltage signal afterwards generates control signal, then passes through the pressure regulation
Circuit 200 generates operating voltage according to the control signal and the supply voltage, so that the illuminating source can basis
The operating voltage adjusts the brightness of itself, reduces the difference between self brightness and ambient brightness.
In some embodiments provided by the present application, the control circuit 100 includes the first partial pressure branch 110 and compares branch
120。
The first input end of the first partial pressure branch 110 is connect with the high level voltage signal, first partial pressure
Second input end grounding of branch 110, the first partial pressure branch 110 is for receiving the high level voltage signal, according to institute
The resistance value for stating external environment brightness adjustment itself, according to it is adjusted itself resistance value and the high level voltage signal generate
Feedback voltage.
The relatively first input end of branch 120 is connect with the reference voltage signal, and the of the comparison branch 120
Two input terminals are connect with the first partial pressure branch 110, and the relatively branch 120 is for receiving the reference voltage signal and institute
Feedback voltage is stated, and control signal is generated according to the reference voltage signal and the feedback voltage.
In the present embodiment, described first divides branch 110 according to the resistance value of the external environment brightness adjustment itself, in turn
So that output feedback voltage convert, then by it is described relatively branch 120 to the reference voltage signal and it is described instead
Feedthrough voltage is compared, and generates control signal according to comparison result, so that regulating circuit 200 is adjusted according to the control signal
The operating voltage of output.
In some embodiments provided by the present application, the regulating circuit 200 includes switching branches 210 and the second partial pressure branch
220。
The output end of first input end branch 120 compared with described of the switching branches 210 connects, the switching branches
210 the second input terminal is connect with the supply voltage, the third input end grounding of the switching branches 210, the switch branch
The output end on road 210 is connect with illuminating source, and the switching branches 210 are used to receive the control signal, and according to the control
Signal processed is exported using the supply voltage as the operating voltage to the illuminating source.
The second of input terminal and the supply voltage and the switching branches 210 of the second partial pressure branch 220 is defeated
Enter end connection, the output end of the second partial pressure branch 220 and the output end and the illuminating source of the switching branches 210
Connection.
In the present embodiment, the switching branches 210 are opened or closed according to control signal realization.When switch branch
When road 210 is closed, it is the operating voltage by the supply voltage, is supplied to illuminating source by the switching branches 210.When
When the switching branches 210 disconnect, operating voltage is provided by the second partial pressure branch 220, at this time described operating voltage etc.
The voltage at second partial pressure, 220 both ends of branch is subtracted in supply voltage, the voltage at the illuminating source both ends reduces, to lead
Brightness is caused to reduce.
In some embodiments provided by the present application, the first partial pressure branch 110 includes first resistor R1 and second resistance
R2。
The first end of the first resistor R1 is connect with the high level voltage signal, the second end of the first resistor R1
The second input terminal connection of branch 120, the first resistor R1 are photo resistance compared with described.
The first end of the second resistance R2 and the second end of the first resistor R1 and it is described compared with branch 120
The connection of two input terminals, the second end ground connection of the second resistance R2.
In the present embodiment, the first resistor R1 is photo resistance, and resistance value reduces with the increase of brightness, around ring
When brightness in border reaches its luminance threshold, the resistance value is approximately equal to 0.Therefore, when ambient brightness is greater than its luminance threshold
When, the feedback voltage is equal to VDD.When ambient brightness is less than luminance threshold, the brightness of the first resistor R1 is gradually
Increase, the feedback voltage is VDD*R2/ (R1+R2).
Fig. 3 is referred to, front frame covering edge (corresponding to the dotted line position in Fig. 3) of the display panel offers window
310, the first resistor R1 detect the brightness of ambient enviroment by the window 310.The i.e. described first resistor R1 is located at non-aobvious
Show region, setting first resistor R1 both will not influence the normal display of display area in this position, will not block shadow by front frame
Ring detecting effect.
In some embodiments provided by the present application, the relatively branch 120 includes comparator D1, and the comparator D1 is just
It is connect to input terminal with the reference voltage signal, the second of the negative input of the comparator D1 and the first resistor R1
The connection of the first end of end and the second resistance R2, the first input of the output end and the switching circuit of the comparator D1
End connection.
In the present embodiment, the voltage of the reference voltage signal is about VDD*80%, therefore when ambient brightness is greater than
When its luminance threshold, the voltage of the comparator D1 positive input is less than the voltage of its negative input, the comparator D1
The low level control signal of output.When ambient brightness is less than luminance threshold, the brightness of the first resistor R1 gradually increases
Greatly, when the feedback voltage V DD*R2/ (R1+R2) is less than the reference voltage signal, the comparator D1 output high level
Control signal.
In some embodiments provided by the present application, the switching branches 210 include switching tube M1 and 3rd resistor R3.
The grid of the switching tube M1 is connect with the output end of the comparator D1, the source electrode of the switching tube M1 with it is described
Supply voltage connection, the drain electrode of the switching tube M1 are connect with the illuminating source.
The grid of the output end and the switching tube M1 of the first end of the 3rd resistor R3 and the comparator D1 connects
It connects, the second end ground connection of the 3rd resistor R3.
Second bleeder circuit includes the 4th resistance, the first end of the 4th resistance and the supply voltage and institute
State the source electrode connection of switching tube M1, the second end of the 4th resistance and the drain electrode of the switching tube M1 and the illuminating source
Connection.
It is appreciated that when the control signal is low level signal, the switching tube M1 conducting passes through the switching tube
The supply voltage is supplied directly to illuminating source by M1.When the control signal is high level signal, the switching tube M1
It disconnects, provides operating voltage by the 4th resistance R4 for illuminating source, the work electricity provided at this time for the illuminating source
Pressure is equal to the voltage that supply voltage subtracts the both ends the 4th resistance R4.
Fig. 4 is referred to, assumes that the high level voltage signal is VDD in the present embodiment, the supply voltage is Vled, institute
Stating first resistor R1 is photo resistance, and resistance value reduces, second resistance R2,3rd resistor R3 with the increase of ambient brightness
It is conventional, electric-resistance with the 4th resistance R4, the reference voltage is VDD*80%, and the illuminating source is LED light string, the LED
The equivalent resistance of lamp string is Rled.
When ambient brightness is not less than the luminance threshold of first resistor R1, the resistance value of first resistor R1 is approximately equal to 0 at this time
Ohm, the negative input voltage of comparator D1 are VDD, and the voltage of positive input is that reference voltage Vref (is approximately equal to
VDD*80%), so the control signal of comparator D1 output at this time is low level, switching tube M1 conducting, is at this time the LED light
Voltage on string is supply voltage Vled, and the LED light string works normally.
When ambient brightness is less than the luminance threshold of first resistor R1 (such as 30 lumens), first resistor R1 at this time
Resistance value increases, and the voltage value of comparator D1 negative input is VDD*R2/ (R1+R2) at this time, by the way that the first resistor is arranged
The ratio of R1 and second resistance R2 may make that comparator D1 is negative when ambient brightness is less than the luminance threshold of first resistor R1
It is less than reference voltage signal value Vref to the voltage value VDD*R2/ (R1+R2) of input terminal.The control letter of comparator D1 output at this time
It number is high level signal, the switching tube M1 grid is high level, and the switching tube M1 is disconnected.It is applied to the LED light at this time
Voltage on string is Vled*R3/ (R2+R3), i.e., the voltage decline being applied at this time in LED light string, backlight illumination reduces.
In some embodiments provided by the present application, the switching tube M1 can be field-effect tube, or triode.
Based on the same inventive concept, present invention also provides a kind of backlight modules.The backlight module includes: LED light string
And driving circuit.The LED light string, including multiple LED light, for providing light source.The driving circuit and the LED light are contacted
It connects, for powering for the LED light string.
In the present embodiment, the driving circuit includes control circuit 100 and regulating circuit 200.
The first input end of the control circuit 100 is connect with high level voltage signal, and the second of the control circuit 100
Input terminal connects reference voltage signal, and the third input end grounding of the control circuit 100, the control circuit 100 is for connecing
The high level voltage signal and the reference voltage signal are received, according to the resistance value of external environment brightness adjustment itself, according to tune
Resistance value and the high level voltage signal and the reference voltage signal after whole generate control signal.
The first input end of the regulating circuit 200 is connect with the output end of the control circuit 100, the regulating circuit
200 the second input terminal is connect with supply voltage, the third input end grounding of the regulating circuit 200, the regulating circuit 200
For receiving the control signal and the supply voltage, work electricity is generated according to the control signal and the supply voltage
Pressure, and export to the LED light string.
In some embodiments provided by the present application, the control circuit 100 include first resistor R1, second resistance R2 and
Comparator D1.
The first end of the first resistor R1 is connect with the high level voltage signal, and the first resistor R1 is photosensitive electricity
Resistance.
The first end of the second resistance R2 is connect with the second end of the first resistor R1, and the of the second resistance R2
Two ends ground connection.
The positive input of the comparator D1 is connect with the reference voltage signal, the negative sense input of the comparator D1
End is connect with the first end of the second end of the first resistor R1 and the second resistance R2.
In some embodiments provided by the present application, the regulating circuit 200 includes switching tube M1,3rd resistor R3 and the
Four resistance R4.
The grid of the switching tube M1 is connect with the output end of the comparator D1, the source electrode of the switching tube M1 with it is described
Supply voltage connection, the drain electrode of the switching tube M1 are connect with the LED light string.
The grid of the output end and the switching tube M1 of the first end of the 3rd resistor R3 and the comparator D1 connects
It connects, the second end ground connection of the 3rd resistor R3.
The first end of the 4th resistance R4 is connect with the source electrode of the supply voltage and the switching tube M1, and described
The second end of four resistance R4 is connect with the drain electrode of the switching tube M1 and the LED light string.
In the present embodiment, the first resistor R1 is photo resistance, and resistance value reduces with the increase of brightness, around ring
When brightness in border reaches its luminance threshold, the resistance value is approximately equal to 0.Therefore, when ambient brightness is greater than its luminance threshold
When, the feedback voltage is equal to VDD.When ambient brightness is less than luminance threshold, the brightness of the first resistor R1 is gradually
Increase, the feedback voltage is VDD*R2/ (R1+R2).
Assuming that the high level voltage signal is VDD, the supply voltage is Vled, and the first resistor R1 is photosensitive electricity
Resistance, second resistance R2,3rd resistor R3 and the 4th resistance R4 are conventional, electric-resistance, and the reference voltage is VDD*80%, described
The equivalent resistance of LED light string is Rled.
When ambient brightness is not less than the luminance threshold of first resistor R1, the resistance value of first resistor R1 is approximately equal to 0 at this time
Ohm, the negative input voltage of comparator D1 are VDD, and the voltage of positive input is that reference voltage Vref (is approximately equal to
VDD*80%), so the control signal of comparator D1 output at this time is low level, switching tube M1 conducting, is at this time the LED light
Voltage on string is supply voltage Vled, and the LED light string works normally.
When ambient brightness is less than the luminance threshold of first resistor R1 (such as 30 lumens), first resistor R1 at this time
Resistance value increases, and the voltage value of comparator D1 negative input is VDD*R2/ (R1+R2) at this time, by the way that the first resistor is arranged
The ratio of R1 and second resistance R2 may make that comparator D1 is negative when ambient brightness is less than the luminance threshold of first resistor R1
It is less than reference voltage signal value Vref to the voltage value VDD*R2/ (R1+R2) of input terminal.The control letter of comparator D1 output at this time
It number is high level signal, the switching tube M1 grid is high level, and the switching tube M1 is disconnected.It is applied to the LED light at this time
Voltage on string is Vled*R3/ (R2+R3), i.e., the voltage decline being applied at this time, the brightness of the LED light string reduces, because
The backlight illumination of this backlight module reduces.
Based on the same inventive concept, present invention also provides a kind of display panel, the display panel includes display area
And peripheral circuit area.The display area is for being shown.Peripheral circuit area matches setting with the display area, uses
In powering for the display area and provide driving signal.
Wherein, the peripheral circuit area includes driving circuit, and the driving circuit includes control circuit 100 and pressure regulation electricity
Road 200.
The first input end of the control circuit 100 is connect with high level voltage signal, and the second of the control circuit 100
Input terminal connects reference voltage signal, and the third input end grounding of the control circuit 100, the control circuit 100 is for connecing
The high level voltage signal and the reference voltage signal are received, according to the resistance value of the external environment brightness adjustment itself, root
Control signal is generated according to resistance value adjusted and the high level voltage signal and the reference voltage signal.
The first input end of the regulating circuit 200 is connect with the output end of the control circuit 100, the regulating circuit
200 the second input terminal is connect with supply voltage, and the regulating circuit 200 is for receiving the control signal and power supply electricity
Pressure, and operating voltage is generated according to the control signal and the supply voltage.
The driving circuit as described in the present embodiment is driving circuit described in any of the above-described embodiment, herein no longer
Repeat its implementation and working principle.
To sum up, the embodiment of the present application provides a kind of driving circuit, backlight module and display panel.The driving circuit packet
Include control circuit 100 and regulating circuit 200.The first input end of the control circuit 100 is connect with high level voltage signal, institute
State the second input terminal connection reference voltage signal of control circuit 100, the third input end grounding of the control circuit 100, institute
Control circuit 100 is stated to be used to receive the high level voltage signal and the reference voltage signal, it is bright according to the external environment
The resistance value of degree adjustment itself, generates according to resistance value adjusted and the high level voltage signal and the reference voltage signal
Control signal.The first input end of the regulating circuit 200 is connect with the output end of the control circuit 100, the pressure regulation electricity
Second input terminal on road 200 is connect with supply voltage, the third input end grounding of the regulating circuit 200, the regulating circuit
200 generate work for receiving the control signal and the supply voltage, and according to the control signal and the supply voltage
Make voltage.In driving circuit provided by the present application, the control circuit 100 is according to the resistance of the external environment brightness adjustment itself
Value generates control signal according to resistance value adjusted and the high level voltage signal and the reference voltage signal, then
Operating voltage is generated according to the control signal and the supply voltage by the regulating circuit 200, so that the hair
Radiant can adjust the brightness of itself according to the operating voltage, reduce the difference between self brightness and ambient brightness.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The several embodiments of the application above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
The limitation to claim therefore cannot be interpreted as.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the application
Range.Therefore, the scope of protection shall be subject to the appended claims for the application patent.
Claims (10)
1. a kind of driving circuit characterized by comprising
Control circuit, first input end are connect with high level voltage signal, and the second input terminal connects reference voltage signal, and third is defeated
Enter end ground connection, for receiving the high level voltage signal and the reference voltage signal, certainly according to external environment brightness adjustment
The resistance value of body generates control letter according to resistance value adjusted and the high level voltage signal and the reference voltage signal
Number；And
Regulating circuit, first input end are connect with the output end of the control circuit, and the second input terminal is connect with supply voltage, the
Three input end groundings, for receiving the control signal and the supply voltage, and according to the control signal and the power supply
Voltage generates operating voltage.
2. driving circuit as described in claim 1, which is characterized in that the control circuit includes:
First partial pressure branch, first input end are connect with the high level voltage signal, the second input end grounding, for receiving
State high level voltage signal, according to the resistance value of the external environment brightness adjustment itself, according to it is adjusted itself resistance value with
And the high level voltage signal generates feedback voltage；And
Compare branch, first input end is connect with the reference voltage signal, and the second input terminal and the first partial pressure branch connect
It connects, for receiving the reference voltage signal and the feedback voltage, and according to the reference voltage signal and feedback electricity
Pressure generates control signal.
3. driving circuit as claimed in claim 2, which is characterized in that the regulating circuit includes:
Switching branches, the output end connection of first input end branch compared with described, the second input terminal and the supply voltage connect
It connects, third input end grounding, output end is connect with illuminating source, is believed for receiving the control signal, and according to the control
Number using the supply voltage as the operating voltage, and export to the illuminating source；And
Second partial pressure branch, input terminal are connect with the second input terminal of the supply voltage and the switching branches, output end
It is connect with the output end of the switching branches and the illuminating source.
4. driving circuit as claimed in claim 3, which is characterized in that described first, which divides branch, includes:
First resistor, first end are connect with the high level voltage signal, the second input terminal of second end branch compared with described
Connection, the first resistor are photo resistance；And
Second resistance, first end and the second end of the first resistor and it is described compared with the second input terminal of branch connect, the
Two ends ground connection.
5. driving circuit as claimed in claim 4, which is characterized in that it is described relatively branch include:
Comparator, positive input are connect with the reference voltage signal, the second end of negative input and the first resistor
And the first end connection of the second resistance, output end are connect with the first input end of the switching circuit.
6. driving circuit as claimed in claim 5, which is characterized in that the switching branches include:
Switching tube, grid are connect with the output end of the comparator, and source electrode is connect with the supply voltage, and drain electrode shines with described
Light source connection；And
3rd resistor, first end are connect with the grid of the output end of the comparator and the switching tube, second end ground connection.
7. driving circuit as claimed in claim 6, which is characterized in that second bleeder circuit includes:
4th resistance, first end are connect with the source electrode of the supply voltage and the switching tube, second end and the switching tube
Drain electrode and the illuminating source connection.
8. a kind of backlight module characterized by comprising
LED light string, including multiple LED light, for providing light source；And
Driving circuit is connect with the LED light string, for powering for the LED light string；
Wherein, the driving circuit includes:
Control circuit, first input end are connect with high level voltage signal, and the second input terminal connects reference voltage signal, and third is defeated
Enter end ground connection, for receiving the high level voltage signal and the reference voltage signal, certainly according to external environment brightness adjustment
The resistance value of body generates control letter according to resistance value adjusted and the high level voltage signal and the reference voltage signal
Number；And
Regulating circuit, first input end are connect with the output end of the control circuit, and the second input terminal is connect with supply voltage, the
Three input end groundings, for receiving the control signal and the supply voltage, according to the control signal and power supply electricity
Pressure generates operating voltage, and exports to the LED light string.
9. backlight module as claimed in claim 8, which is characterized in that the driving circuit specifically includes:
First resistor, first end are connect with the high level voltage signal, and the first resistor is photo resistance；
Second resistance, first end are connect with the second end of the first resistor, second end ground connection；
Comparator, positive input are connect with the reference voltage signal, the second end of negative input and the first resistor
And the first end connection of the second resistance；
Switching tube, grid are connect with the output end of the comparator, and source electrode is connect with the supply voltage, drain electrode and the LED
Lamp string connection；
3rd resistor, first end are connect with the grid of the output end of the comparator and the switching tube, second end ground connection；With
And
4th resistance, first end are connect with the source electrode of the supply voltage and the switching tube, second end and the switching tube
Drain electrode and the LED light string connection.
10. a kind of display panel, which is characterized in that the display panel includes:
Display area, for being shown；With
Peripheral circuit area matches setting with the display area, for powering and providing driving letter for the display area
Number；
Wherein, the peripheral circuit area includes driving circuit, and the driving circuit includes:
Control circuit, first input end are connect with high level voltage signal, and the second input terminal connects reference voltage signal, and third is defeated
Enter end ground connection, for receiving the high level voltage signal and the reference voltage signal, certainly according to external environment brightness adjustment
The resistance value of body generates control letter according to resistance value adjusted and the high level voltage signal and the reference voltage signal
Number；And
Regulating circuit, first input end are connect with the output end of the control circuit, and the second input terminal is connect with supply voltage, the
Three input end groundings, for receiving the control signal and the supply voltage, and according to the control signal and the power supply
Voltage generates operating voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811579749.0A CN109523957B (en) | 2018-12-24 | 2018-12-24 | Drive circuit, backlight module and display panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811579749.0A CN109523957B (en) | 2018-12-24 | 2018-12-24 | Drive circuit, backlight module and display panel |
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| CN109523957A true CN109523957A (en) | 2019-03-26 |
| CN109523957B CN109523957B (en) | 2021-06-18 |
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| CN201811579749.0A Active CN109523957B (en) | 2018-12-24 | 2018-12-24 | Drive circuit, backlight module and display panel |
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