CN109410847A - Backlight control circuit and control method - Google Patents
Backlight control circuit and control method Download PDFInfo
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- CN109410847A CN109410847A CN201811389240.XA CN201811389240A CN109410847A CN 109410847 A CN109410847 A CN 109410847A CN 201811389240 A CN201811389240 A CN 201811389240A CN 109410847 A CN109410847 A CN 109410847A
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000005611 electricity Effects 0.000 claims description 10
- 239000003990 capacitor Substances 0.000 claims description 7
- 230000005669 field effect Effects 0.000 claims description 7
- 230000001939 inductive effect Effects 0.000 claims description 5
- 238000004088 simulation Methods 0.000 claims description 3
- 230000003760 hair shine Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract 2
- 239000004973 liquid crystal related substance Substances 0.000 description 13
- 239000000758 substrate Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000004065 semiconductor Substances 0.000 description 5
- 239000010409 thin film Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 206010037660 Pyrexia Diseases 0.000 description 2
- 230000005142 aphototropism Effects 0.000 description 2
- 241001080526 Vertica Species 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
- 230000001755 vocal effect Effects 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
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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Abstract
The invention discloses a backlight control circuit and a control method. The method comprises the following steps: providing a light bar of a backlight source; a control module for driving the light bar; the feedback resistor is connected with the light bar in parallel and is electrically connected with the control module; the control module reads first voltages at two ends of the feedback resistor and adjusts current for driving the light bar according to the first voltages; the resistance value of the feedback resistor is larger than that of the light bar. The resistance value of the feedback resistor is larger than that of the light bar in a mode that the feedback resistor is connected with the light bar in parallel, so that the current flowing into the feedback resistor is smaller than that flowing into the light bar, heating generated when the current flows through the feedback resistor is reduced, power consumption generated by heating of the feedback resistor is reduced, and the effect of reducing loss is achieved; meanwhile, the voltage value can be fed back through the feedback resistor, and the lamp strip is driven by the control module according to the feedback voltage value, so that the required backlight intensity is effectively controlled.
Description
Technical field
The present invention relates to field of display technology more particularly to a kind of backlight control circuit and control methods.
Background technique
There are many merits such as thin fuselage, power saving, radiationless, obtain with progress, liquid crystal display with the development of science and technology
It is widely applied.Liquid crystal display on existing market is largely backlight liquid crystal display comprising liquid crystal display panel and
Backlight module (Backlight Module).Liquid crystal display panel includes color membrane substrates (Color Filter Substrate, CF
Substrate, also referred to as colored filter substrate), thin-film transistor array base-plate (Thin Film Transistor
Substrate, TFTSubstrate), there are transparent electrodes for the relative inner of aforesaid substrate.One layer of liquid crystal is pressed from both sides between two plate bases
Molecule (LiquidCrystal, LC).
Since liquid crystal display panel itself does not shine, need the light source provided by backlight module normally to show image,
Therefore backlight module becomes one of the key component of liquid crystal display.Backlight module is divided into side according to the difference of light source incidence position
Enter formula backlight module and two kinds of down straight aphototropism mode set.Down straight aphototropism mode set is by illuminating source such as cathodouminescence fluorescent tube
(Cold Cathode Fluorescent Lamp, CCFL) or light emitting diode (Light Emitting Diode, LED) are set
It sets at liquid crystal display panel rear, directly forms area source and be supplied to liquid crystal display panel.And side entrance back module is by LED light bar
(Light Bar) is set to the side rear of liquid crystal display panel as backlight.The backlight control circuit of the prior art generally generates larger
Resistance loss, the problem of causing control circuit to generate heat.
Summary of the invention
In view of the drawbacks described above of the prior art, technical problem to be solved by the invention is to provide a kind of reduction backlight controls
The backlight control circuit and control method of circuit loss processed.
To achieve the above object, the present invention provides a kind of backlight control circuits, comprising:
Lamp bar provides backlight；
Control module drives lamp bar；
Feedback resistance, it is in parallel with the lamp bar, it is electrically connected with the control module；
The control module reads the first voltage at the feedback resistance both ends, and according to first voltage adjustment driving
The electric current of lamp bar；
The resistance value of the feedback resistance is greater than the resistance value of the lamp bar.
Optionally, the feedback resistance includes first resistor and second resistance, and the first resistor and second resistance are connected,
It is connected by electrical connection with control module between the first resistor and second resistance, the control module reads second resistance two
The first voltage at end.
Optionally, the first resistor is adjustable resistance.
Optionally, the second resistance is adjustable resistance.
Optionally, the resistance value of the feedback resistance is greater than 100 kilo-ohms.
Optionally, the control module includes control unit and driving unit, and described control unit includes voltage comparator,
The voltage comparator makes comparisons the first voltage that feedback resistance is fed back with calibration voltage, and described control unit passes through the electricity
It presses the result of comparator to control the driving unit and drives lamp bar；The calibration voltage is voltage needed for the driving lamp bar.
Optionally, described control unit further include:
Register stores electrical parameter and the order of input；
Programmable interface unit, is electrically connected with register；
The digital signal of electrical parameter is switched to analog signal by digital analog converter；
Voltage correction unit, analog signal correction；
Electrical parameter code is write by programmable interface unit, converts digital signals into mould through digital analog converter
Quasi- signal, voltage correction unit are corrected analog signal, and analog signal is supplied to driving unit by voltage comparator
Lamp bar is driven to shine.
Optionally, the driving unit includes active switch, and control electric current inputs lamp bar；The active switch includes, defeated
Enter end and output end, the input terminal is electrically connected with the control unit, the driving unit further include:
Inductive resistance, one end are electrically connected with the output end, and the other end is electrically connected to a power source；
Diode, positive to be electrically connected with the output end, cathode is electrically connected with the anode of lamp bar；
Capacitor, one end are electrically connected with the cathode of the diode, other end ground connection.
Optionally, the active switch includes field effect transistor.
The invention also discloses a kind of backlight control circuits, comprising:
Lamp bar provides backlight；
Control module drives lamp bar；
Feedback resistance, it is in parallel with the lamp bar；
The feedback resistance includes first resistor and second resistance, the first resistor and second resistance series connection, and described the
It is connected by electrical connection with control module between one resistance and second resistance, the resistance value of the first resistor and second resistance is big
In 100 kilo-ohms；
The control module includes control unit and driving unit, and described control unit includes,
Voltage comparator compares the first voltage and calibration voltage of feedback resistance feedback；The calibration voltage is driving institute
Voltage needed for stating lamp bar；
Register stores electrical parameter and the order of input；
Programmable interface unit, is electrically connected with register；
The digital signal of electrical parameter is switched to analog signal by digital analog converter；
Voltage correction unit, analog signal correction；
Electrical parameter code is write by the programmable interface unit, through the digital analog converter by digital signal
It is converted into analog signal, and the voltage correction unit is corrected analog signal, simulation is believed by the voltage comparator
Number it is supplied to the driving unit；
The driving unit includes active switch, and control electric current inputs lamp bar；The active switch includes, input terminal and defeated
Outlet, the input terminal are electrically connected with the control unit, and the driving unit further includes,
Inductive resistance, one end are electrically connected with the output end, and the other end is electrically connected to a power source；
Diode, positive to be electrically connected with the output end, cathode is electrically connected with the anode of lamp bar；
Capacitor, one end are electrically connected with the cathode of the diode, other end ground connection；
The active switch includes field effect transistor.
The invention also discloses a kind of control methods of backlight control circuit, comprising:
Electrical parameter needed for determining backlight；Convert digital signals into analog signal；Analog signal is corrected；
Lamp bar is driven to shine according to analog signal by control module；
The first voltage of control module acquisition feedback resistance feedback is made comparisons with calibration voltage, and value is identical, then terminates；Value is not
Together, readjust backlight needed for electrical parameter, into described the step of converting digital signals into analog signal continue into
Row.
According to inventors have found that feedback resistance is connected with lamp bar, when control module driving current flows into lamp bar, by joule
Theorem Q=I2Rt can be obtained, and feedback resistance will lead to a large amount of power consumption.In the present invention, pass through the feedback resistance side in parallel with lamp bar
Formula makes the resistance value of feedback resistance be greater than the resistance value of lamp bar, so that the electric current that feedback resistance flows into is less than the electric current for flowing into lamp bar, subtracts
The fever that electric current flows through feedback resistance and generates is lacked, has reduced because feedback resistance sends out power consumption thermogenetic, to reach drop
Low-loss effect；Lamp bar can be driven simultaneously according to feedback voltage level control module, had by feedback resistance feedback voltage level
The backlight intensity that effect control needs.
Detailed description of the invention
Included attached drawing is used to provide that a further understanding of the embodiments of the present application, and which constitute one of specification
Point, presently filed embodiment is illustrated, and come together to illustrate the principle of the application with verbal description.It should be evident that retouching below
Attached drawing in stating is only some embodiments of the present application, for those of ordinary skill in the art, is not paying creativeness
Under the premise of laborious, it is also possible to obtain other drawings based on these drawings.In the accompanying drawings:
Fig. 1 is a kind of schematic diagram of backlight control circuit of the embodiment of the present invention；
Fig. 2 is the schematic diagram of another kind backlight control circuit of the embodiment of the present invention；
Fig. 3 is the schematic diagram of another kind backlight control circuit of the embodiment of the present invention；
Fig. 4 is the schematic diagram of another kind backlight control circuit of the embodiment of the present invention；
Fig. 5 is a kind of step schematic diagram of the control method of backlight control circuit of the embodiment of the present invention.
Wherein, 10, lamp bar；R1, first resistor；R2, second resistance；R3,3rd resistor；V1, first voltage；20, it controls
Module；21, control unit；22, driving unit；23, voltage comparator；24, register；25, programmable interface unit；26, number
Word analog converter；27, voltage correction unit；28, diode；29, active switch；290, input terminal；291, output end；293,
Field effect transistor (metal-oxide-semiconductor)；30, feedback resistance；VCC, power supply；C, capacitor；RL, inductance capacitance.
Specific embodiment
Specific structure and function details disclosed herein are only representative, and are that description is of the invention exemplary
The purpose of embodiment.But the present invention can be implemented by many alternative forms, and be not interpreted as only
It is limited to the embodiments set forth herein.
In the description of the present invention, it is to be understood that, term " center ", " transverse direction ", "upper", "lower", "left", "right",
The orientation or positional relationship of the instructions such as "vertical", "horizontal", "top", "bottom", "inner", "outside" be orientation based on the figure or
Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.In addition, art
Language " first ", " second " only describe purpose, are not understood to indicate or imply relative importance or implicitly indicate indicated
Technical characteristic quantity.Define " first " as a result, the feature of " second " can explicitly or implicitly include one or
More this feature.In the description of the present invention, unless otherwise indicated, the meaning of " plurality " is two or more.In addition,
Term " includes " and its any deformation, it is intended that cover and non-exclusive include.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
Term used herein above is not intended to limit exemplary embodiment just for the sake of description specific embodiment.Unless
Context clearly refers else, otherwise singular used herein above "one", " one " also attempt to include plural number.Also answer
When understanding, term " includes " and/or "comprising" used herein above provide stated feature, integer, step, operation,
The presence of unit and/or component, and do not preclude the presence or addition of other one or more features, integer, step, operation, unit,
Component and/or combination thereof.
Thin Film Transistor-LCD (thin film transistor-liquid crystal display, TFT-
LCD) when carrying out pixel display matrix (Array) design, such as Fig. 1, voltage comparator 23 flows through the electricity of lamp bar 10 by control
Stream controls luminous intensity, and 3rd resistor R3 feeds back the voltage value of lamp bar 10, then via voltage comparator 23 by 3rd resistor R3
The voltage value of feedback is compared with calibration voltage, realizes the purpose of control backlight.Because the electric current for flowing through LED light must flow through the
Three resistance R3, by Joule's law Q=I2Rt is it is found that the design of 3rd resistor R3 will lead to a large amount of power consumption, for this phenomenon, if
A kind of method for improving control backlight is counted.
The invention will be further described with preferred embodiment with reference to the accompanying drawing.
As shown in Figures 2 to 4, the embodiment of the present invention discloses a kind of backlight control circuit, comprising: provides the lamp of backlight
Item 10；Drive the control module 20 of lamp bar 10；With feedback resistance 30, feedback resistance 30 is in parallel with lamp bar 10, with control module 20
Electrical connection；Control module 20 reads the first voltage V1 at 30 both ends of feedback resistance, and according to first voltage V1 adjustment driving
The electric current of lamp bar 10；The resistance value of feedback resistance 30 is greater than the resistance value of lamp bar 10.
The lamp bar of the present embodiment is LED light bar.
In the present solution, making the resistance value of feedback resistance 30 be greater than lamp bar in such a way that feedback resistance 30 is in parallel with lamp bar 10
10 resistance value reduces electric current and flows through feedback resistance so that the electric current that feedback resistance 30 flows into is less than the electric current for flowing into lamp bar 10
30 and the fever that generates, reduce because feedback resistance 30 sends out power consumption thermogenetic, to reach the low-loss effect of drop；Simultaneously
Lamp bar, the effectively back of control needs can be driven according to feedback voltage level control module by 30 feedback voltage level of feedback resistance
Luminous intensity.
The present embodiment is optional, and feedback resistance 30 includes first resistor R1 and second resistance R2, first resistor R1 and second
Resistance R2 series connection, is connected by electrical connection with control module 20 between first resistor R1 and second resistance R2, and control module 20 is read
Take the first voltage V1 at the both ends second resistance R2.
In the present solution, being together in series using two feedback resistances 30, using the principle of series circuit electric resistance partial pressure, so that two
The first voltage V1 of feedback is less than the voltage at 10 both ends of lamp bar by a resistance.
The present embodiment is optional, and first resistor R1 is adjustable resistance.
In the present solution, backlight illumination needed for different environment is different, electrical property needed for the different luminous quantities of lamp bar 10 is joined
Number is different, and first resistor R1 is arranged to adjustable resistance, provides different electrical parameters and needs suitable resistance value.
The present embodiment is optional, and second resistance R2 is adjustable resistance.
In the present solution, the first voltage V1 of second resistance R2 feedback is given to control module 20, control module 20 is electric by first
Pressure V1 make comparisons with required electrical parameter, resistance value is adjusted in second resistance R2 so that occur appropriate voltage range with it is required
Electrical parameter is made comparisons.
The present embodiment is optional, and the resistance value of feedback resistance 30 is greater than 100 kilo-ohms.
In the present solution, 30 value of feedback resistance is bigger, the electric current for flowing into feedback resistance 30 is smaller, and the value of feedback resistance 30 is greater than
When 100 kilo-ohms, electric current be can be ignored, and realize that power is approximately zero, to realize low-power consumption.
The present embodiment is optional, and control module 20 includes control unit 21 and driving unit 22, and control unit 21 includes electricity
Comparator 23 is pressed, voltage comparator 23 makes comparisons the first voltage V1 that feedback resistance 30 is fed back with calibration voltage, when the first electricity
Pressure value V1 and calibration voltage according to the electrical parameter of different pressure difference adjustment inputs, and then control driving unit there are when pressure difference
The electric current of 22 adjustment driving lamp bars 10, thus comes so that the first voltage value meets calibration voltage.
In the present solution, making ratio with calibration voltage to the first voltage V1 that feedback resistance 30 is fed back by voltage comparator 23
Compared with, if result is identical, control module 20 drives lamp bar 10 to shine, if result is different, the adjustment input lamp bar of control module 20
10 electric current.By the voltage at 23 recoverable lamp bar of voltage comparator, 10 both ends, making the voltage at 10 both ends of lamp bar is needed for backlight
Voltage parameter.
The present embodiment is optional, and control unit 21 further includes；Register 24 stores electrical parameter and the order of input；It can
Programming interface unit 25 is electrically connected with register 24；Digital analog converter 26 switchs to the digital signal of electrical parameter to simulate
Signal；Voltage correction unit 27, analog signal correction；Electrical parameter code is write by programmable interface unit 25, through number
Analog converter 26 converts digital signals into analog signal, and voltage correction unit 27 is corrected analog signal, passes through electricity
Analog signal is supplied to driving unit 22 and lamp bar 10 is driven to shine by pressure comparator 23.
In the present solution, can taking human as the desired electrical parameter of output, i.e., lamp bar is inputted by programmable interface unit 25
Calibration voltage needed for 10 backlights, the convenient back light source brightness provided lamp bar 10 are adjusted, while including voltage correction list
Member 27, it is ensured that the signal for being output to driving unit 22 is accurate, ensure that driving unit 22 is driving lamp bar 10 just indirectly
Really shine.
The present embodiment is optional, and driving unit 22 includes active switch 29, and control electric current inputs lamp bar 10；Active switch 29
Including input terminal 290 and output end 291, input terminal 290 are electrically connected with control unit 21, driving unit 22 further include: inductance electricity
RL is hindered, one end is electrically connected with output end 291, and the other end is electrically connected with power supply VCC；Diode 28, anode are electrically connected with output end 291
It connects, cathode is electrically connected with the anode of lamp bar 10；Capacitor C, one end are electrically connected with the cathode of diode 28, other end ground connection.Driving
Unit 22 includes active switch 29, can control the relationship between input and output, can be with when input is in a certain range
Output provides the necessary condition that driving unit 22 keeps lamp bar 10 luminous.
The present embodiment is optional, and active switch 29 includes field effect transistor 293.
In the present solution, no matter N-type or p-type metal-oxide-semiconductor, working principle essence is the same.Metal-oxide-semiconductor is by being added in input
The voltage of 290 grids is held to carry out the electric current of the drain electrode of control output end 291.Metal-oxide-semiconductor be voltage-controlled device it pass through the electricity that is added on grid
The characteristic of pressure controller part, will not occur as when triode switchs because of charge-storage effect caused by base current, therefore
In switch application, the switching speed of metal-oxide-semiconductor should be faster than triode, is ideal analog switch device.
As another embodiment of the present invention, as shown in figure 4, disclosing a kind of backlight control circuit, comprising: control unit
21, driving unit 22, lamp bar 10 and feedback resistance 30；Feedback resistance 30 is in parallel with lamp bar 10；Feedback resistance 30 includes first
Resistance R1 and second resistance R2, first resistor R1 and second resistance R2 series connection, pass through between first resistor R1 and second resistance R2
Electrical connection is connected with control module 20, and the resistance value of first resistor R1 and second resistance R2 are greater than 100 kilo-ohms；Control unit 21 is wrapped
Include: voltage comparator 23 compares the first voltage V1 and calibration voltage of the feedback of feedback resistance 30；Register 24, stores input
Electrical parameter and order；Programmable interface unit 25 is electrically connected with register 24；Digital analog converter 26, electrical parameter
Digital signal switch to analog signal；Voltage correction unit 27, analog signal correction；Electricity is write by programmable interface unit 25
Property parameter codes, convert digital signals into analog signal through digital analog converter 26,27 pairs of simulations letters of voltage correction unit
It number is corrected, analog signal is supplied to by driving unit 22 by voltage comparator 23；Driving unit 22 includes: active switch
29, control electric current inputs lamp bar 10；Active switch 29 includes input terminal 290 and output end 291, input terminal 290 and control unit
21 electrical connections；Inductive resistance RL, one end are electrically connected with output end 291, and the other end is electrically connected with power supply VCC；Diode 28, anode
It is electrically connected with output end 291, cathode is electrically connected with the anode of lamp bar 10；Capacitor C, one end are electrically connected with the cathode of diode, separately
One end ground connection；Active switch includes field effect transistor 293.
Feedback resistance 30 is in parallel with lamp bar 10, and 30 value of feedback resistance is bigger, and the electric current for flowing into feedback resistance 30 is smaller, instead
When feed 30 values of resistance are greater than 100 kilo-ohms, electric current be can be ignored, and realize that power is approximately zero, to realize low-power consumption.
As another embodiment of the present invention, as shown in figure 5, disclosing a kind of control method of backlight control circuit, wrap
It includes:
S51: electrical parameter needed for determining backlight；
S52: analog signal is converted digital signals into；
S53: analog signal is corrected；
S54: lamp bar is driven to shine according to analog signal by control module；
S55: the first voltage of control module acquisition feedback resistance feedback is made comparisons with calibration voltage；
S56: value is identical, then terminates；Value is different, electrical parameter needed for readjusting backlight, into it is described will be digital
Signal is converted into the step of analog signal and continues.
Can taking human as the desired electrical parameter of output, the convenient back light source brightness provided lamp bar 10 is adjusted, root
Reliable electrical parameter is exported again according to the voltage value of feedback, effectively control backlight.
It should be noted that the restriction for each step being related in this programme, in the premise for not influencing concrete scheme implementation
Under, it does not regard as being can be the step of making restriction to step sequencing, write on front what is first carried out, be also possible to
It executes, is possibly even performed simultaneously afterwards, as long as this programme can be implemented, all shall be regarded as belonging to protection model of the invention
It encloses.
Panel of the invention can be TN panel (full name is Twisted Nematic, i.e. twisted nematic panel), IPS
Panel (In-PlaneSwitcing, plane conversion), VA panel (Multi-domain Vertica Alignment, more quadrants
Vertical orientation technology), it is of course also possible to be other kinds of panel, it is applicable in.
The above content is combine specific optional embodiment further detailed description of the invention, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to of the invention
Protection scope.
Claims (10)
1. a kind of backlight control circuit characterized by comprising
Lamp bar provides backlight；
Control module drives lamp bar；
Feedback resistance, it is in parallel with the lamp bar, it is electrically connected with the control module；
The control module reads the first voltage at the feedback resistance both ends, and drives the lamp bar according to first voltage adjustment
Electric current；
The resistance value of the feedback resistance is greater than the resistance value of the lamp bar.
2. a kind of backlight control circuit as described in claim 1, which is characterized in that the feedback resistance include first resistor and
Second resistance, the first resistor and second resistance series connection, pass through electrical connection and institute between the first resistor and second resistance
It states control module to be connected, the control module reads the first voltage at second resistance both ends.
3. a kind of backlight control circuit as claimed in claim 2, which is characterized in that the first resistor is adjustable resistance.
4. a kind of backlight control circuit as described in claim 1, which is characterized in that the resistance value of the feedback resistance is greater than
100 kilo-ohms.
5. a kind of backlight control circuit as described in claim 1, which is characterized in that the control module include control unit and
Driving unit, described control unit include voltage comparator, the first electricity that the voltage comparator feeds back the feedback resistance
Pressure is made comparisons with calibration voltage, and described control unit controls the driving unit by the result of the voltage comparator and drives institute
Lamp bar is stated, the calibration voltage is voltage needed for the driving lamp bar.
6. a kind of backlight control circuit as claimed in claim 5, which is characterized in that described control unit further include:
Register stores electrical parameter and the order of input；
Programmable interface unit, is electrically connected with register；
The digital signal of the electrical parameter is switched to analog signal by digital analog converter；
Voltage correction unit, analog signal correction；
Electrical parameter code is write by programmable interface unit, converts digital signals into simulation letter through digital analog converter
Number, voltage correction unit is corrected analog signal, and analog signal is supplied to driving unit driving by voltage comparator
Lamp bar shines.
7. a kind of backlight control circuit as claimed in claim 6, which is characterized in that the driving unit includes active switch,
It controls electric current and inputs lamp bar；The active switch includes that input terminal and output end, the input terminal are electrically connected with described control unit
It connects, the driving unit further include:
Inductive resistance, one end are electrically connected with the output end, and the other end is electrically connected to a power source；
Diode, positive to be electrically connected with the output end, cathode is electrically connected with the anode of lamp bar；
Capacitor, one end are electrically connected with the cathode of the diode, other end ground connection.
8. a kind of backlight control circuit as claimed in claim 7, which is characterized in that the active switch includes field effect transistor
Pipe.
9. a kind of backlight control circuit characterized by comprising
Lamp bar provides backlight；
Control module drives lamp bar；
Feedback resistance, it is in parallel with the lamp bar；
The feedback resistance includes first resistor and second resistance, and the first resistor and second resistance are connected, first electricity
It is connected by electrical connection with control module between resistance and second resistance, the resistance value of the first resistor and second resistance is greater than
100 kilo-ohms；
The control module includes control unit and driving unit, and described control unit includes:
Voltage comparator compares the first voltage and calibration voltage of feedback resistance feedback；The calibration voltage is to drive the lamp
Voltage needed for item；
Register stores electrical parameter and the order of input；
Programmable interface unit, is electrically connected with register；
The digital signal of electrical parameter is switched to analog signal by digital analog converter；
Voltage correction unit, analog signal correction；
Electrical parameter code is write by the programmable interface unit, converts digital signal through the digital analog converter
At analog signal, the voltage correction unit is corrected analog signal, is proposed analog signal by the voltage comparator
Supply the driving unit；
The driving unit includes active switch, and control electric current inputs lamp bar；The active switch includes input terminal and output
End, the input terminal are electrically connected with the control unit, the driving unit further include:
Inductive resistance, one end are electrically connected with the output end, and the other end is electrically connected to a power source；
Diode, positive to be electrically connected with the output end, cathode is electrically connected with the anode of lamp bar；
Capacitor, one end are electrically connected with the cathode of the diode, other end ground connection；
The active switch includes field effect transistor.
10. a kind of control method of the backlight control circuit as described in 1 to 9 any one of the claims, which is characterized in that
Include:
Electrical parameter needed for determining backlight；Convert digital signals into analog signal；Analog signal is corrected；Pass through
Control module drives lamp bar to shine according to analog signal；
The first voltage of control module acquisition feedback resistance feedback is made comparisons with calibration voltage, and value is identical, then terminates；Value is different,
Electrical parameter needed for readjusting backlight, continues into described the step of converting digital signals into analog signal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811389240.XA CN109410847A (en) | 2018-11-21 | 2018-11-21 | Backlight control circuit and control method |
| PCT/CN2018/119547 WO2020103199A1 (en) | 2018-11-21 | 2018-12-06 | Backlight control circuit and method for controlling same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811389240.XA CN109410847A (en) | 2018-11-21 | 2018-11-21 | Backlight control circuit and control method |
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| CN112419961A (en) * | 2019-08-20 | 2021-02-26 | 深圳市洲明科技股份有限公司 | Voltage-regulating energy-saving circuit and LED display module |
| CN115267312A (en) * | 2022-08-02 | 2022-11-01 | 远峰科技股份有限公司 | ADC voltage detection compensation method, device, equipment and storage medium |
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| CN114497320B (en) * | 2022-01-29 | 2024-07-09 | 京东方科技集团股份有限公司 | Preparation method, driving method and device of light-emitting substrate |
| CN115132146B (en) * | 2022-07-04 | 2024-06-21 | Tcl华星光电技术有限公司 | Light emitting device driving chip, backlight module and display panel |
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| WO2020103199A1 (en) | 2020-05-28 |
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Application publication date: 20190301 |