CN110415654A - LED drive chip, LED driving method and liquid crystal display device - Google Patents
LED drive chip, LED driving method and liquid crystal display device Download PDFInfo
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- CN110415654A CN110415654A CN201910666498.8A CN201910666498A CN110415654A CN 110415654 A CN110415654 A CN 110415654A CN 201910666498 A CN201910666498 A CN 201910666498A CN 110415654 A CN110415654 A CN 110415654A
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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
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- G—PHYSICS
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- 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
- G09G3/36—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 using liquid crystals
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Abstract
The present invention provides a kind of LED drive chip, LED driving method and liquid crystal display device.The LED drive chip includes memory module, switching module and current regulating module, and memory module stores or update gradient data table；Switching module exports corresponding interrupt instruction according to visual angle selection signal, and data are arranged according to corresponding gradient in interrupt instruction timing acquisition and output gradient data table；Current regulating module is arranged data according to gradient and exports the light formation brightness step that corresponding gradient group electric current issues LED light group.The present invention can at least switch two editions different gradient group electric currents and export to LED light group, and original control chip, single-stage boost chip and LED drive chip this three chips can be replaced, to reduce the potential risk of three chips collocation, circuit is more succinct, and the layout of circuit board is more convenient and corresponding cost is less.
Description
Technical field
The invention belongs to display technology field, it is related to a kind of LED drive chip, LED driving method and liquid crystal display dress
It sets.
Background technique
Existing liquid crystal display device has mixing visual angle (Hybird Viewing Angle, HVA), and wide view may be implemented
Switching between angle (Wide Viewing Angle, WVA) and narrow viewing angle (Narrow Viewing Angle, NVA).Meanwhile
Backlight respectively provides a kind of backlight in wide viewing angle and narrow viewing angle, and from intermediate region to two sides, gradually gradient becomes for the brightness of the backlight
Change, then backlight needs to drive LED light group to issue both backlights according to two groups of different electric currents.
However, generate two groups of different electric currents generally require control chip (MCU, MicroController Unit),
The collocation of this three chips of single-stage boost chip and LED drive chip uses, then there is the potential risk of collocation, and have circuit compared with
The problem of complicated, circuit board layout is inconvenient and cost increases accordingly.
Summary of the invention
In view of this, it is an object of that present invention to provide a kind of LED drive chip, LED driving method and liquid crystal display device,
It is exported at least switching two editions different gradient group electric currents to LED light group, and original control chip, single-stage boosting can be replaced
Chip and LED drive chip this three chips, to reduce the potential risk of three chips collocation, circuit is more succinct, circuit board
Layout it is more convenient and corresponding cost is less.
The embodiment of the present invention provides a kind of LED drive chip, and the LED drive chip includes memory module, switching module
And current regulating module, the memory module include memory and PERCOM peripheral communication end, the memory passes through the PERCOM peripheral communication
End is communicated with external equipment to store or update gradient data table；The switching module includes relay, timer and posts
Storage, the relay are used to export corresponding interrupt instruction, the register when receiving external visual angle selection signal
Be connected respectively with the relay, the timer and the memory, with when receiving the interrupt instruction timing acquisition and
Export corresponding gradient setting data in the gradient data table；The current regulating module and the switching module phase
Even, also it is connected one by one by multiple current output terminals with the multi-string LED lamp of the LED light group, and number is arranged according to the gradient
Brightness step is formed according to the light that corresponding gradient group electric current issues the LED light group is exported.
Further, the register includes reference current register and gradient proportion register；The register is connecing
When receiving the interrupt instruction, the reference current register obtains and exports the reference current value in the gradient setting data,
The gradient proportion register obtains and exports multiple gradient proportions in the gradient setting data.
Further, the PERCOM peripheral communication end includes serial clock terminal and serial data end.
Further, the timer includes modulated signal input terminal, enabled input terminal, system clock receiving end and timing
Signal output end, and it is received outer according to the received external modulation signal of the modulated signal input terminal, the enabled input terminal
Portion's enable signal and the received clock signal of system in system clock receiving end are believed by the timing after signal synchronous modulation
Number output end exports synchronous timing signal to the register.
Further, the LED drive chip further includes the clock system being connected with the timer, the clock system
It is connected one by one by the first connecting pin and second connection end with the input terminal of external crystal oscillator and output end, described in generation
Clock signal of system.
Further, the LED drive chip further includes voltage drive module, and the voltage drive module is for passing through electricity
Press output end output LED driving voltage to the LED light group, the voltage drive module includes booster circuit and feed circuit,
The booster circuit includes first voltage input terminal and switch selection end, and the first voltage input terminal receives first voltage, institute
It states switch selection end to be connected with external inductance, the feed circuit is connected with the booster circuit, the feed circuit control
The first voltage is boosted to the LED driving voltage and exported to the voltage output end by the booster circuit.
Further, the feed circuit automatically adjusts the LED according to the output electric current of the current regulating module and drives
The size of dynamic voltage.
Further, the LED drive chip further includes power module, and the power module passes through second voltage input terminal
Second voltage is received, and the memory module, the switching module and the corresponding operating voltage of the current regulating module are provided.
The embodiment of the present invention also provides a kind of LED driving method, which is characterized in that comprising steps of S1, storage or update ladder
Spend tables of data；S2, corresponding interrupt instruction is exported according to visual angle selection signal, and according to the interrupt instruction timing acquisition and defeated
Data are arranged in corresponding gradient in the gradient data table out；S3, the corresponding gradient group of data output is set according to the gradient
The light that electric current issues LED light group forms brightness step.
The embodiment of the present invention also provides a kind of liquid crystal display device, which is characterized in that including above-mentioned LED drive chip,
To drive LED light group to generate backlight.
LED drive chip, LED driving method and liquid crystal display device provided by the invention can at least switch two editions not
Same gradient group electric current is exported to LED light group, and can replace original control chip, single-stage boost chip and LED driving core
This three chips of piece, to reduce the potential risk of three chips collocation, circuit is more succinct, and the layout of circuit board is more convenient and phase
Answer cost less.
For above and other objects, features and advantages of the invention can be clearer and more comprehensible, preferred embodiment is cited below particularly,
And cooperate institute's accompanying drawings, it is described in detail below.
Detailed description of the invention
Fig. 1 is the inside composition figure of the LED drive chip of one embodiment of the invention,
Fig. 2 is the work switching schematic diagram of the LED drive chip of one embodiment of the invention.
Fig. 3 is two editions gradient luminance figures that the LED drive chip driving LED light group of one embodiment of the invention generates.
Fig. 4 is the flow chart of the LED driving method of one embodiment of the invention.
Specific embodiment
Further to illustrate that the present invention is the technical means and efficacy realizing expected purpose and being taken, below in conjunction with attached drawing
And preferred embodiment, to the specific reality of LED drive chip proposed according to the present invention, LED driving method and liquid crystal display device
Mode, method, step, structure, feature and effect are applied, detailed description is as follows.
For the present invention aforementioned and other technology contents, feature and effect refer to the preferable reality of schema in following cooperation
Applying in the detailed description of example to be clearly presented.By the explanation of specific embodiment, when expection can be reached to the present invention
The technical means and efficacy that purpose is taken be able to more deeply and it is specific understand, however institute's accompanying drawings be only to provide with reference to
Purposes of discussion is not intended to limit the present invention.
Fig. 1 is the inside composition figure of the LED drive chip of one embodiment of the invention.The present embodiment provides a kind of LED drivings
Chip, as shown in Figure 1, the LED drive chip includes memory module 100, switching module 200 and current regulating module 300, storage
Module 100 includes memory 110 and PERCOM peripheral communication end 120, and memory 110 is carried out by PERCOM peripheral communication end 120 and external equipment
Communication is to store or update gradient data table；Switching module 200 includes relay 210, timer 2 20 and register 230, is interrupted
Device 210 is used to export corresponding interrupt instruction when receiving external visual angle selection signal, register 230 respectively with relay
210, timer 2 20 is connected with memory 110, with corresponding in timing acquisition when severed finger enables in the reception and output gradient data
Data are arranged in gradient；Current regulating module 300 is connected with switching module 200, also passes through multiple current output terminals (301,302 ...
30n) it is connected one by one with the multi-string LED lamp of LED light group 700, and data output gradient group electric current is arranged according to gradient to make LED light group
700 light issued form brightness step.
Specifically, in the present embodiment, the light that LED light group 700 issues refers to be gradually formed from intermediate region to two sides
Brightness step.In other embodiments, the light that LED light group 700 issues also may be implemented gradually to be incremented by from side to the other side
Or the brightness step to be formed that successively decreases, this can be separately provided gradient data table according to design requirement and display demand, In
This is with no restriction.
Specifically, in the present embodiment, memory module 100 may include memory 110 and PERCOM peripheral communication end 120, memory
110 can store gradient data table, which includes the gradient for the electric current of each lamp string of LED light group 700 to be arranged
Data are set, and PERCOM peripheral communication end 120 can be used for being communicated with external equipment, then external equipment can pass through PERCOM peripheral communication end
120 make memory 110 store or update gradient data table.In an embodiment, gradient data table may include multiple gradient settings
Tables of data is arranged to read one of gradient according to interrupt instruction in tables of data.In an embodiment, external equipment can also pass through
PERCOM peripheral communication end 120 is electrical connected with register 230, to read 230 data of register, setting 230 work order of register etc..
In one embodiment, PERCOM peripheral communication end 120 includes serial clock terminal 121 and serial data end 122, then outside is logical
Letter end 120 can be connected by I2C bus with external equipment, but the invention is not limited to I2C buses, can also pass through SPI
Bus or UART bus etc. are connected with external equipment.
In the present embodiment, switching module 200 includes relay 210, timer 2 20 and register 230.Relay 210 is used
In exporting corresponding interrupt instruction when receiving external visual angle selection signal.It include below the first view with visual angle selection signal
The present embodiment is illustrated for angle selection signal V1 and the second visual angle selection signal V2.At the first visual angle (such as wide viewing angle)
It is the first visual angle selection signal V1 that relay 210, which receives external visual angle selection signal, when display, and accordingly severed finger in output
Enabling is the first interrupt instruction, or relay 210 receives external visual angle choosing in the second visual angle (such as narrow viewing angle) display
Selecting signal is the second visual angle selection signal V2, and accordingly output interrupt instruction is the second interrupt instruction.Register 230 is respectively in
Disconnected device 210, timer 2 20 are connected with memory 110, and when the first interrupt instruction of the output of device 210 of breaking in the reception, Ke Yigen
According to the synchronous gradient data table for reading memory 110 of rising edge (or failing edge) for the timing clock signal that timer 2 20 exports
In corresponding gradient setting data, that is, first gradient data are set, data are arranged with timing acquisition first gradient and can will be read
First gradient setting data export to current regulating module 300, or in the reception break device 210 export the second interrupt instruction
When, it can be according to the synchronous ladder for reading memory 110 of rising edge (or failing edge) for the timing clock signal that timer 2 20 exports
It spends corresponding gradient setting i.e. the second gradient of data in tables of data and data is set, data are arranged with the second gradient of timing acquisition and can
It is exported with the second gradient setting data that will be read to current regulating module 300.
In a way of example, register 230 may include reference current register and gradient proportion register；Deposit
Device 230 is when severed finger enables in the reception, reference current register obtain and output gradient setting data in reference current value, gradient
Ratio register obtains and multiple gradient proportions in data are arranged in output gradient.Wherein, gradient setting data may include ginseng
Current value and multiple gradient proportions are examined, gradient group electric current can be by the way that reference current value to be multiplied to obtain with multiple gradient proportions.
Specifically, register 230 may include reference current register and gradient proportion register；The severed finger in the reception of register 230
When order is the first interrupt instruction, register is available and exports corresponding gradient setting data, that is, first gradient setting data,
Reference current register is available and the first reference current value in data, gradient proportion register is arranged in output first gradient
Multiple first gradient ratios in available and output first gradient setting data；Severed finger order is register 230 in the reception
When the second interrupt instruction, register is available and exports corresponding gradient setting data i.e. the second gradient setting data, reference
Electric current register is available and output the second gradient setting data in the second reference current value, gradient proportion register can be with
Obtain and export multiple second gradient proportions in the second gradient setting data.
In one embodiment, timer 2 20 may include modulated signal input terminal 221, enabled input terminal 222, system
Clock receiving end 223 and timing signal output 224, and according to the received external modulation signal of modulated signal input terminal 221, make
The received external enable signal of energy input terminal 222 and the received clock signal of system in system clock receiving end 223, the same step of signal
Synchronous timing signal is exported to register 230 by timing signal output 224 after system.
In one embodiment, LED drive chip can also include the clock system 500 being connected with timer 2 20, clock
The input terminal and output end that system 500 passes through the first connecting pin 501 and second connection end 502 and external crystal oscillator are one by one
It is connected, generation system clock signal.
In the present embodiment, current regulating module 300 is connected with switching module 200, also by multiple current output terminals (301,
302 ... 30n) it is connected one by one with the multi-string LED lamp of LED light group 700, and data are arranged according to first gradient and export first gradient group
The light that electric current issues LED light group 700 gradually forms the first brightness step from centre to two sides, or is set according to the second gradient
The light that setting data the second gradient group electric current of output issues LED light group 700 gradually forms the second brightness ladder from centre to two sides
Degree, such as it is 8 gradient current values that data, which are arranged, to obtain first gradient group electric current according to first gradient, and IFB1~IFB8 distinguishes
For 20mA, 19mA, 18mA, 17.2mA, 16.4mA, 15.6mA, 14.8mA and 14mA, then can make LED light group 700 from two sides to
The electric current of intermediate LED light is followed successively by 20mA, 19mA, 18mA, 17.2mA, 16.4mA, 15.6mA, 14.8mA and 14mA, thus,
The light emission luminance of two sides LED light is maximum, and the brightness of intermediate LED light is minimum, increases from centre to the brightness step of two sides LED light,
To which the light that LED light group 700 issues gradually forms the first brightness step from centre to two sides.
In one embodiment, first gradient setting data may include the first reference current value and multiple first gradients ratio
Example, first gradient group electric current can be multiplied to obtain from the first reference current value and multiple first gradient ratios, the setting of the second gradient
Data may include the second reference current value and multiple second gradient proportions, and the second gradient group electric current can be from the second reference current
Value is multiplied to obtain with multiple second gradient proportions.
In one embodiment, LED drive chip can also include voltage drive module 400, and voltage drive module 400 is used
In exporting LED driving voltage to LED light group 700 by voltage output end, voltage drive module 400 may include booster circuit
410 and feed circuit 420, booster circuit 410 may include first voltage input terminal 411 and switch selection end 412, first voltage
Input terminal 411 receives first voltage, and switch selection end 412 is connected with external inductors, feed circuit 420 and 410 phase of booster circuit
Even, feed circuit 420 controls booster circuit 410 and first voltage is boosted to LED driving voltage and is exported to voltage output end.
In the present embodiment, the booster circuit 410 in voltage drive module 400 can be modulated according to corresponding pulse width to be believed
Number conducting and breaking inner switch element, by the received first voltage of first voltage input terminal 411 boost to LED driving electricity
Pressure, and LED driving voltage is exported to LED light group 700, so that each string LED light of LED light group 700 connects by voltage output end
The LED driving voltage is received, and corresponding electric current is generated according to the voltage, and issue brightness corresponding with size of current.
In one embodiment, feed circuit 420 can be automatically adjusted according to the output electric current of current regulating module 300
The size of LED driving voltage.For example, current regulating module 300 obtains first gradient setting data from register 230, and to adjust
Section exports corresponding first gradient group electric current, and first gradient group electric current is, for example, 8 gradient current values, and IFB1~IFB8 distinguishes
For 20mA, 19mA, 18mA, 17.2mA, 16.4mA, 15.6mA, 14.8mA and 14mA, then in each string LED light of LED light group 700
Electric current it is larger, then feed circuit 420 is accordingly adjusted, make booster circuit 410 export LED driving voltage increase；In
After carrying out view angle switch, current regulating module 300 obtains the second gradient setting data from register 230, and to adjust output phase
The the second gradient group electric current answered, the second gradient group electric current is, for example, 8 gradient current values, and IFB1~IFB8 is respectively 4.9mA,
5.18mA, 5.46mA, 5.74mA, 6.02mA, 6.3mA, 6.65mA and 7mA, the then electric current in each string LED light of LED light group 700
Smaller, then feed circuit 420 is accordingly adjusted, and the LED driving voltage for exporting booster circuit 410 reduces.
In one embodiment, LED drive chip can also include power module 600, and power module 600 passes through the second electricity
It presses input terminal to receive second voltage, and memory module 100, switching module 200 and current regulating module 300 is provided and worked accordingly
Voltage.In an embodiment, power module 600 can be grounded by ground terminal.
Specifically, the working method of the LED drive chip of the present embodiment can refer to Fig. 2, and Fig. 2 is one embodiment of the invention
LED drive chip work switch schematic diagram.As shown in Fig. 2, when carrying out the display of the first visual angle, in switching module 200
It is the first visual angle selection signal V1 such as low level signal that disconnected device 210, which receives external visual angle selection signal, and relay 210 is defeated
Corresponding interrupt instruction is the first interrupt instruction to register 230 out, and register 230 passes through timer according to the first interrupt instruction
220 are arranged data to update first gradient, i.e., data are arranged from 110 timing acquisition first gradient of the memory of memory module 100.
Wherein, memory 110 be communicated by PERCOM peripheral communication end 120 with external equipment to obtain such as gradient data table, and
It therefrom obtains corresponding first gradient setting data and the second gradient setting data and is stored or updated.In an embodiment,
It may include the first reference current value and multiple first gradient ratios that data, which are arranged, in one gradient, and can deposited by external equipment
The data that first reference current value carries out 3mA~25mA range are arranged and are modified by reservoir 110, and can also be by multiple first ladders
It is 8 or 10 that degree ratio, which is configured, and the present embodiment is not intended to limit the quantity of first gradient ratio；Moreover, register 230
It may include reference current register and gradient proportion register, reference current register can be accordingly by the first reference current value
Storage updates, and multiple first gradient ratios accordingly can be stored or be updated by gradient proportion register.
First gradient can be arranged data and exported to electric current tune by register 230 after receiving first gradient setting data
Module 300 is saved, in an embodiment, register 230 is exported the first reference current value to electric current tune by reference to electric current register
Module 300 is saved, and is exported multiple first gradient ratios to current regulating module 300 by gradient proportion register.Electric current tune
It saves module 300 and passes through multiple current output terminals (301,302 ... 30n) output first gradient group electricity according to first gradient setting data
The light that stream issues LED light group 700 gradually forms the first brightness step from centre to two sides.Wherein, in current regulating module
When 300 output first gradient group electric current, voltage drive module 400 exports LED driving voltage to LED light also by voltage output end
Group 700, to drive the multi-string LED lamp of LED light group 700 to turn on and generate corresponding electric current.
When carrying out the display of the second visual angle, the relay 210 of switching module 200 receives external visual angle selection signal and is
Second visual angle selection signal V2 such as high level signal, relay 210 export interrupt instruction as the second interrupt instruction to register
230, register 230 updates the second gradient setting data by timer 2 20 according to the second interrupt instruction, i.e., from memory module
Data are arranged in 100 110 the second gradient of timing acquisition of memory.Wherein, memory 110 is by PERCOM peripheral communication end 120 and outer
Portion's equipment is communicated to obtain such as gradient data table, and therefrom obtains corresponding first gradient setting data and the second gradient
Setting data are simultaneously stored or are updated.In an embodiment, the second gradient setting data may include the second reference current value and
Multiple second gradient proportions, and the second reference current value can be carried out in memory 110 by 3mA~25mA model by external equipment
The data setting and modification enclosed, and multiple second gradient proportions can also be configured is 8 or 10, the present embodiment is simultaneously
The quantity of the second gradient proportion is not limited；Moreover, register 230 may include reference current register and gradient proportion deposit
Device, reference current register can accordingly by the second reference current value store or update, gradient proportion register can accordingly by
Multiple second gradient proportion storages update.
Second gradient can be arranged data and exported to electric current tune by register 230 after receiving the second gradient setting data
Module 300 is saved, in an embodiment, register 230 is exported the second reference current value to electric current tune by reference to electric current register
Module 300 is saved, and is exported multiple second gradient proportions to current regulating module 300 by gradient proportion register.Electric current tune
It saves module 300 and passes through multiple current output terminals (301,302 ... 30n) output the second gradient group electricity according to the second gradient setting data
The light that stream issues LED light group 700 gradually forms the second brightness step from centre to two sides.Wherein, in current regulating module
When 300 the second gradient group electric current of output, voltage drive module 400 exports LED driving voltage to LED light also by voltage output end
Group 700, to drive the multi-string LED lamp of LED light group 700 to turn on and generate corresponding electric current.
Wherein, the present embodiment LED drive chip produces LED light group 700 respectively when the first visual angle and the second visual angle are shown
Raw first brightness step and the second brightness step, i.e., visual angle, which is shown, can have two editions brightness steps available, two editions brightness ladders
Degree is not identical, so as to preferably show under two kinds of visual angles to image.
Such as in an embodiment, LED drive chip is when two kinds of visual angles are shown, the reference current register of register 230
With the first reference current value corresponding in gradient proportion register, multiple first gradient ratios, the second reference current value and multiple
Second gradient proportion difference is as shown in table 1, thus, the current gradient under two kinds of visual angles is as shown in table 2, and can refer to Fig. 3, figure
3 be two editions gradient luminance figures of the LED drive chip generation of one embodiment of the invention.
Table 1:
Table 2:
From figure 3, it can be seen that the LED drive chip of the present embodiment can produce two editions different brightness steps, and can be with
It is respectively used to two kinds of visual angles.Wherein, when the first visual angle is shown, the light emission luminance of two sides LED light is maximum, intermediate LED light it is bright
Degree is minimum, increases from centre to the brightness step of two sides LED light, thus, the light that LED light group 700 issues is from centre to two sides
Gradually form the first brightness step；When the second visual angle is shown, the light emission luminance of two sides LED light is minimum, the brightness of intermediate LED light
Maximum, from centre to the brightness step of two sides LED light reduce, thus, LED light group 700 issue light from centre to two sides by
Gradually form the second brightness step.
The LED drive chip of the present embodiment can at least switch two editions different gradient group electric currents and export to LED light group
700, and original control chip, single-stage boost chip and LED drive chip this three chips can be replaced, to reduce by three
The potential risk of chip collocation, circuit is more succinct, and the layout of circuit board is more convenient and corresponding cost is less.
The embodiment of the present invention also based on the same inventive concept, provides a kind of LED driving method, and Fig. 4 is that the present invention one is implemented
Example LED driving method flow chart, as shown in figure 4, the driving method comprising steps of
S1, storage update gradient data table；
S2, corresponding interrupt instruction is exported according to visual angle selection signal, and according to interrupt instruction timing acquisition and output ladder
It spends corresponding gradient in tables of data and data is set；
S3, the light formation brightness ladder that corresponding gradient group electric current issues LED light group is exported according to gradient setting data
Degree.
The implementation of the LED driving method may refer to the embodiment of above-mentioned LED drive chip, and overlaps will not be repeated.
The LED driving method of the present embodiment can at least switch two editions different gradient group electric currents and export to LED light group
700, original control chip, single-stage boost chip and LED drive chip can be replaced using the driving chip of the driving method
This three chips, to reduce the potential risk of three chips collocation, circuit is more succinct, and the layout of circuit board is more convenient and corresponding
Cost is less.
The embodiment of the present invention also based on the same inventive concept, provides a kind of liquid crystal display device, the liquid crystal display device packet
Above-mentioned LED drive chip is included, driving LED light group 700 generates backlight.The specific embodiment of the embodiment can refer to above-mentioned
The embodiment of LED drive chip, details are not described herein again.
The liquid crystal display device of the present embodiment can at least switch two editions different gradient group electric currents and export to LED light group
700, and original control chip, single-stage boost chip and LED drive chip this three chips can be replaced, to reduce by three
The potential risk of chip collocation, circuit is more succinct, and the layout of circuit board is more convenient and corresponding cost is less.
The above described is only a preferred embodiment of the present invention, be not intended to limit the present invention in any form, though
So the present invention has been disclosed as a preferred embodiment, however is not limited to invent, any person skilled in the art,
It is not departing within the scope of inventive technique scheme, when the technology contents using the disclosure above make a little change or are modified to equivalent
The equivalent embodiment of variation, but it is all without departing from inventive technique scheme content, and the technical spirit according to invention is to above embodiments
Made any simple modification, equivalent change and modification, all of which are still within the scope of the technical scheme of the invention.
Claims (10)
1. a kind of LED drive chip, for driving LED light group (700), which is characterized in that the LED drive chip includes:
Memory module (100), the memory module (100) include memory (110) and PERCOM peripheral communication end (120), the storage
Device (110) is communicated by the PERCOM peripheral communication end (120) with external equipment to store or update gradient data table；
Switching module (200), the switching module (200) include relay (210), timer (220) and register (230),
The relay (210) is used to export corresponding interrupt instruction, the register when receiving external visual angle selection signal
(230) it is connected respectively with the relay (210), the timer (220) and the memory (110), with described in the reception
Data are arranged with corresponding gradient in the gradient data table is exported in timing acquisition when interrupt instruction；
Current regulating module (300), the current regulating module (300) are connected with the switching module (200), also by multiple
Current output terminal is connected one by one with the multi-string LED lamp of the LED light group (700), and data output phase is arranged according to the gradient
The light that the gradient group electric current answered issues the LED light group (700) forms brightness step.
2. LED drive chip according to claim 1, which is characterized in that the register (230) includes that reference current is posted
Storage and gradient proportion register；When receiving the interrupt instruction, the reference current register obtains the register (230)
The reference current value in the gradient setting data is taken and exports, the gradient proportion register obtains and exports the gradient and sets
Set multiple gradient proportions in data.
3. LED drive chip according to claim 1, which is characterized in that when the PERCOM peripheral communication end (120) includes serial
Zhong Duan (121) and serial data end (122).
4. LED drive chip according to claim 1, which is characterized in that the timer (220) includes that modulated signal is defeated
Enter end (221), enabled input terminal (222), system clock receiving end (223) and timing signal output (224), and according to described
The received external modulation signal of modulated signal input terminal (221), the received external enable signal of the enabled input terminal (222) and
The system clock receiving end (223) received clock signal of system is exported by the timing signal after signal synchronous modulation
(224) are held to export synchronous timing signal to the register (230).
5. LED drive chip according to claim 4, which is characterized in that the LED drive chip further include with it is described fixed
When device (220) connected clock system (500), the clock system (500) passes through the first connecting pin (501) and second connection end
(502) it is connected one by one with the input terminal of external crystal oscillator and output end, generates the clock signal of system.
6. LED drive chip according to claim 1, which is characterized in that the LED drive chip further includes voltage driving
Module (400), the voltage drive module (400) are used to export LED driving voltage to the LED light group by voltage output end
(700)；The voltage drive module (400) includes booster circuit (410) and feed circuit (420), the booster circuit (410)
Including first voltage input terminal (411) and switch selection end (412), the first voltage input terminal (411) receives first voltage,
Switch selection end (412) is connected with external inductance, and the feed circuit (420) is connected with the booster circuit (410),
The feed circuit (420) controls the booster circuit (410) and the first voltage is boosted to the LED driving voltage and defeated
Out to the voltage output end.
7. LED drive chip according to claim 6, which is characterized in that the feed circuit (420) is according to the electric current
The output electric current of adjustment module (300) automatically adjusts the size of the LED driving voltage.
8. LED drive chip according to claim 1, which is characterized in that the LED drive chip further includes power module
(600), the power module (600) receives second voltage by second voltage input terminal, and provides the memory module
(100), the switching module (200) and the current regulating module (300) corresponding operating voltage.
9. a kind of LED driving method of such as described in any item LED drive chips of claim 1-8, which is characterized in that including step
It is rapid:
S1, storage update gradient data table；
S2, corresponding interrupt instruction is exported according to visual angle selection signal, and according to the interrupt instruction timing acquisition and output institute
State corresponding gradient setting data in gradient data table；
S3, the light formation brightness ladder that corresponding gradient group electric current issues LED light group is exported according to gradient setting data
Degree.
10. a kind of liquid crystal display device, which is characterized in that including such as described in any item LED drive chips of claim 1-8,
To drive LED light group (700) to generate backlight.
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| CN111063291A (en) * | 2019-12-26 | 2020-04-24 | Tcl华星光电技术有限公司 | Drive chip, control board, and drive method for control board |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130257827A1 (en) * | 2012-03-28 | 2013-10-03 | Chunghwa Picture Tubes, Ltd. | Backlight module used in display device and control method of the same |
| CN107255873A (en) * | 2017-07-20 | 2017-10-17 | 昆山龙腾光电有限公司 | The changeable display device in width visual angle and driving method |
| CN107342063A (en) * | 2017-08-11 | 2017-11-10 | 昆山龙腾光电有限公司 | Common voltage drive circuit and display device |
| CN207883277U (en) * | 2018-03-08 | 2018-09-18 | 昆山龙腾光电有限公司 | A kind of gamma electric voltage output device and liquid crystal display device |
| CN208705623U (en) * | 2018-09-27 | 2019-04-05 | 昆山龙腾光电有限公司 | The changeable display device in width visual angle |
-
2019
- 2019-07-23 CN CN201910666498.8A patent/CN110415654B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130257827A1 (en) * | 2012-03-28 | 2013-10-03 | Chunghwa Picture Tubes, Ltd. | Backlight module used in display device and control method of the same |
| CN107255873A (en) * | 2017-07-20 | 2017-10-17 | 昆山龙腾光电有限公司 | The changeable display device in width visual angle and driving method |
| CN107342063A (en) * | 2017-08-11 | 2017-11-10 | 昆山龙腾光电有限公司 | Common voltage drive circuit and display device |
| CN207883277U (en) * | 2018-03-08 | 2018-09-18 | 昆山龙腾光电有限公司 | A kind of gamma electric voltage output device and liquid crystal display device |
| CN208705623U (en) * | 2018-09-27 | 2019-04-05 | 昆山龙腾光电有限公司 | The changeable display device in width visual angle |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111063291A (en) * | 2019-12-26 | 2020-04-24 | Tcl华星光电技术有限公司 | Drive chip, control board, and drive method for control board |
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