CN107808640A - Display system and current driving method thereof - Google Patents
Display system and current driving method thereof Download PDFInfo
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- CN107808640A CN107808640A CN201711016415.8A CN201711016415A CN107808640A CN 107808640 A CN107808640 A CN 107808640A CN 201711016415 A CN201711016415 A CN 201711016415A CN 107808640 A CN107808640 A CN 107808640A
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- 239000004973 liquid crystal related substance Substances 0.000 description 13
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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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Abstract
The present application provides a display system and a current driving method thereof, the display system including: display device and current controller, current controller includes: the display device comprises an ambient light sensor, a storage device connected with the ambient light sensor, a digital-to-analog converter connected with the storage device and used for converting a digital reference value of ambient brightness in front of the display device into a first electrical parameter, a comparator connected with the digital-to-analog converter and used for comparing the first electrical parameter with a second electrical parameter corresponding to a working driving current of at least one light-emitting source and generating a driving bias current, and a current regulator connected with the comparator and used for regulating the working driving current of at least one light-emitting source according to the driving bias current, wherein the driving bias current is a difference value between the first electrical parameter and the second electrical parameter. And adjusting the working driving current of at least one light-emitting light source according to the driving bias current, thereby selecting the corresponding digital reference value as the basis for adjusting the working driving current under different use conditions.
Description
Technical field
The invention relates to technical field of liquid crystal display, more particularly to a kind of display system and its electric current driving side
Method.
Background technology
Generally, liquid crystal display（LCD) component is applied in various uses, such as notebook computer, mobile phone, individual number
Word assistant, fascia etc..Typically, illuminating source be located in LCD components behind optical modulator, such as liquid crystal layer in favor of
Watch image and produce optimal luminescent effect.Illuminating source can be fluorescent lamp, electroluminescence part, light emitting diode（LED),
Gaseous discharge lamp etc..General control circuit provides rectified electric current to illuminating source.
The content of the invention
The embodiment of the present application technical problem to be solved is to provide a kind of display system, according to different use conditions come
Control illuminating source in liquid crystal display systems.
Further technical problem to be solved is the electric current driving side for providing a kind of display system to the embodiment of the present application
Method, illuminating source is controlled for display system.
In order to solve the above technical problems, the embodiment of the present application provides following technical scheme first：A kind of display system, bag
Include：
Display device, there is an at least illuminating source；And
Current controller, an at least illuminating source described in connection, the current controller include：
Timer, total lighting time of an at least illuminating source described in calculating；
Storage device, the timer is connected, be configured as multiple digital references that storage corresponds to different total lighting times respectively
Value, wherein the predetermined drive currents of an at least illuminating source described in each Digital reference value is corresponding；
Digital analog converter, it is connected to the storage device and to change the number of total lighting time of an at least illuminating source
Word reference value is into one first electrical parameter；
Comparator, it is connected to the digital analog converter and to first electrical parameter and the corresponding at least one luminous light
Second electrical parameter of the operating driving current in source, and produce driving bias current；And
Current regulator, connect the comparator and according to it is described driving bias current adjustment described in an at least illuminating source work
Make driving current, wherein the driving bias current corresponds to the difference between first electrical parameter and second electrical parameter.
Further, the comparator is voltage comparator；First electrical parameter is described in correspondence at least one luminous light
The voltage of the predetermined drive currents in source；And second electrical parameter is the operating driving current of an at least illuminating source described in correspondence
Feedback voltage.
Further, the comparator is current comparator；First electrical parameter is the luminous light of the correspondence at least one
The current value of the predetermined drive currents in source；And second electrical parameter is the task driven electricity of an at least illuminating source described in correspondence
The feedback current of stream.
Further, the current controller also includes detector, an at least illuminating source described in the detector connection
And to measure second electrical parameter.
Further, the predetermined drive currents of an at least illuminating source are directly proportional to ambient brightness.
Another aspect, the embodiment of the present application provide a kind of display system, including：Display device, it is luminous with least one
Light source；And
Current controller, an at least illuminating source described in connection, the current controller include：
Sensing environment light device, sense the ambient brightness in front of the display device；
Storage device, the sensing environment light device is connected, be configured as multiple numerals that storage corresponds to varying environment brightness respectively
Reference value, wherein the predetermined drive currents of an at least illuminating source described in each Digital reference value is corresponding；
Digital analog converter, it is connected to the storage device and to change the numeral ginseng of the ambient brightness in front of the display device
Value is examined into the first electrical parameter；
Comparator, it is connected to the digital analog converter and to first electrical parameter and the corresponding at least one luminous light
Second electrical parameter of the operating driving current in source, and produce driving bias current；And
Current regulator, connect the comparator and according to it is described driving bias current adjustment described in an at least illuminating source work
Make driving current, wherein the driving bias current corresponds to the difference between first electrical parameter and second electrical parameter.
Further, the predetermined drive currents of an at least illuminating source are directly proportional to ambient brightness.
Further, first electrical parameter is at least voltage of the predetermined drive currents of an illuminating source described in corresponding；
And second electrical parameter is at least feedback voltage of the operating driving current of an illuminating source described in corresponding.
Further, first electrical parameter is the electric current of the correspondence at least predetermined drive currents of an illuminating source
Value；And second electrical parameter is at least feedback current of the operating driving current of an illuminating source described in one corresponding.
On the other hand, the embodiment of the present application additionally provides a kind of current driving method of display system, including：
The sensing environment light device of ambient brightness in front of the corresponding display device of sensing, and the ambient brightness is changed as digital reference
Value, wherein the predetermined drive currents of the corresponding at least illuminating source of the Digital reference value；
The Digital reference value is changed into the first electrical parameter；
At least the second electrical parameter of the operating driving current of an illuminating source described in measurement is corresponding；
Compare first electrical parameter and second electrical parameter, and driving bias current is produced according to comparative result；And according to
The operating driving current of an at least illuminating source described in the driving bias current adjustment；
The predetermined drive currents of an at least illuminating source are directly proportional to ambient brightness；
The driving bias current corresponds to the difference of first electrical parameter and the second electrical parameter.
On the other hand, the embodiment of the present application additionally provides a kind of current driving method of display system, including：
Calculate the timer of total lighting time of an at least illuminating source described in corresponding to, and an at least illuminating source described in conversion
Total lighting time is Digital reference value, wherein the predetermined drive currents of the corresponding at least illuminating source of the Digital reference value；
The Digital reference value is changed into the first electrical parameter；
At least the second electrical parameter of the operating driving current of an illuminating source described in measurement is corresponding；
Compare first electrical parameter and second electrical parameter, and driving bias current is produced according to comparative result；And according to
The operating driving current of an at least illuminating source described in the driving bias current adjustment.
Another aspect, the embodiment of the present application provide a kind of current driving method of display system, including：
The sensing environment light device of the ambient brightness in front of corresponding display device is calculated, and changes the ambient brightness as digital reference
Value, wherein the predetermined drive currents of the corresponding at least illuminating source of the Digital reference value；The Digital reference value is changed into
One electrical parameter；
At least the second electrical parameter of the operating driving current of an illuminating source described in measurement is corresponding；
Compare first electrical parameter and second electrical parameter, and driving bias current is produced according to comparative result；And according to
The operating driving current of an at least illuminating source described in the driving bias current adjustment.
Another aspect, the embodiment of the present application provide a kind of display system, including：
Display device, there is an at least illuminating source；And
Current controller, an at least illuminating source described in connection, the current controller include：
Operating temperature sensor, the operating temperature of an at least illuminating source described in sensing；
Storage device, the operating temperature sensor is connected, be configured as more numbers that storage corresponds to different operating temperature respectively
Word reference value, wherein the predetermined drive currents of an at least illuminating source described in each Digital reference value is corresponding；
Digital analog converter, it is connected to the storage device and to change the numeral of at least operating temperature of an illuminating source
Reference value is into the first electrical parameter；
Comparator, it is connected to the digital analog converter and to first electrical parameter and the corresponding at least one luminous light
Second electrical parameter of the operating driving current in source, and produce driving bias current；And
Current regulator, connect the comparator and according to it is described driving bias current adjustment described in an at least illuminating source work
Make driving current, wherein the driving bias current corresponds to the difference between first electrical parameter and second electrical parameter.
Another aspect, the embodiment of the present application provide a kind of current driving method of display system, including：
Calculate at least operating temperature sensor of the operating temperature of an illuminating source, and change the operating temperature and be described in corresponding to
Digital reference value, wherein the predetermined drive currents of the corresponding at least illuminating source of the Digital reference value；
The Digital reference value is changed into the first electrical parameter；
At least the second electrical parameter of the operating driving current of an illuminating source described in measurement is corresponding；
Compare first electrical parameter and second electrical parameter, and driving bias current is produced according to comparative result；And according to
The operating driving current of an at least illuminating source described in the driving bias current adjustment.
Another aspect, the embodiment of the present application provide a kind of display system, including：
Display device, there is an at least illuminating source；And
Current controller, an at least illuminating source described in connection, the current controller include：
Sensing environment light device, sense the ambient brightness in front of the display device；
Operating temperature sensor, the operating temperature of an at least illuminating source described in sensing；
Storage device, the sensing environment light device and the operating temperature sensor are connected, be configured as storage and correspond to respectively not
With ambient brightness and multiple Digital reference values of different operating temperature, wherein each Digital reference value corresponding described at least one lights
The predetermined drive currents of light source；
Digital analog converter, be connected to the storage device and to change ambient brightness in front of the display device and it is described extremely
The Digital reference value of the operating temperature of a few illuminating source is into the first electrical parameter；
Comparator, it is connected to the digital analog converter and to first electrical parameter and the corresponding at least one luminous light
Second electrical parameter of the operating driving current in source, and produce driving bias current；And
Current regulator, connect the comparator and according to it is described driving bias current adjustment described in an at least illuminating source work
Make driving current, wherein the driving bias current corresponds to the difference between first electrical parameter and second electrical parameter.
Another aspect, the embodiment of the present application provide a kind of display system, including：
Display device, there is an at least illuminating source；And
Current controller, an at least illuminating source described in connection, the current controller include：
First storage device, multiple first Digital reference values that storage corresponds to different use conditions respectively are configured as, wherein often
The predetermined drive currents of an at least illuminating source described in individual first Digital reference value is corresponding；
First digital analog converter, it is connected to the first storage device and to change the first Digital reference value under use condition
Into the first electrical parameter；
OPTICAL SENSORS, the brightness of an at least illuminating source described in sensing；
Second storage device, the OPTICAL SENSORS is connected, be configured as storing the second Digital reference value, wherein second numeral
The operating driving current of an at least illuminating source described in reference value is corresponding；
Second digital analog converter, it is connected to second storage device and to change second Digital reference value into the second electricity
Parameter；
Comparator, it is connected to first digital analog converter and second digital analog converter and to the more described first electricity ginseng
Number and second electrical parameter, and produce driving bias current；And
Current regulator, connect the comparator and according to it is described driving bias current adjustment described in an at least illuminating source work
Make driving current, wherein the driving bias current corresponds to the difference between first electrical parameter and second electrical parameter.
Another aspect, the embodiment of the present application provide a kind of current driving method of display system, including：
The first Digital reference value is changed into the first electrical parameter, wherein first Digital reference value corresponds to an at least illuminating source
Predetermined drive currents；
At least OPTICAL SENSORS of the brightness of an illuminating source, and the brightness of an at least illuminating source described in conversion described in sensing is corresponding
For the second Digital reference value, wherein the operating driving current of the corresponding at least illuminating source of second Digital reference value；
Second Digital reference value is changed into the second electrical parameter；Compare first electrical parameter and second electrical parameter, and
Driving bias current is produced according to comparative result；And according to it is described driving bias current adjustment described in an at least illuminating source work
Make driving current.
By using above-mentioned technical proposal, the embodiment of the present application at least has the advantages that：The application passes through storage
Device is pre-stored multiple Digital reference values, allows each Digital reference value to correspond to different use conditions respectively, is made according to different
By the use of condition select corresponding to Digital reference value be used as adjustment operating driving current foundation.In addition, the second electrical parameter of the application, is removed
Outside can by direct measurement tasks driving current, also brightness can be directly sensed to obtain correspondingly by setting OPTICAL SENSORS
Operating driving current, to avoid under same current the jump in brightness caused by total lighting time or different operating temperature.
Brief description of the drawings
It is required in being described below to embodiment to use in order to illustrate more clearly of the embodiment of the present application technical scheme
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are some embodiments of the present application, general for this area
For logical technical staff, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram for the current regulator that the embodiment of the application one is used for illuminating source.
Fig. 2 provides illuminating source adjustment operating driving current to be a kind of in the embodiment of the application one using voltage comparator
The schematic diagram of controller.
Fig. 3 provides illuminating source adjustment operating driving current to be a kind of in the embodiment of the application one using current comparator
The schematic diagram of controller.
Fig. 4 is the step flow chart of the operating driving current that adjustment flows through illuminating source in the embodiment of the application one.
Fig. 5 provides illuminating source adjustment operating driving current to be a kind of in another embodiment of the application using voltage comparator
Controller schematic diagram.
Fig. 6 provides illuminating source adjustment operating driving current to be a kind of in another embodiment of the application using current comparator
Controller schematic diagram.
Fig. 7 is the step flow chart of the operating driving current that adjustment flows through illuminating source in another embodiment of the application.
Fig. 8 provides illuminating source adjustment operating driving current to be a kind of in another embodiment of the application using voltage comparator
Controller schematic diagram.
Fig. 9 provides illuminating source adjustment operating driving current to be a kind of in another embodiment of the application using current comparator
Controller schematic diagram.
Figure 10 is the step flow chart of the operating driving current that adjustment flows through illuminating source in another embodiment of the application.
Figure 11 provides illuminating source adjustment task driven electricity to be a kind of in another embodiment of the application using voltage comparator
The schematic diagram of the controller of stream.
Figure 12 provides illuminating source adjustment task driven electricity to be a kind of in another embodiment of the application using current comparator
The schematic diagram of the controller of stream.
Figure 13 is the step flow chart of the operating driving current that adjustment flows through illuminating source in another embodiment of the application.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is carried out clear, complete
Site preparation describes.Obviously, described embodiment is some embodiments of the present application, rather than whole embodiments.Based on this Shen
Please in embodiment, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example, belong to the scope of the application protection.
As shown in figure 1, in the one of embodiment of the application, illuminating source module 104 can be located in LCD components
Behind optical modulator.Illuminating source module 104 includes the light emitting diode of series connection（LED).LED current controls synthetic circuit（Also
Referred to as controller）The driving current of 102 control illuminating source modules 104.The output end DRV of controller 102 is via RC wave filters
106 are connected to the base stage of transistor 108.The colelctor electrode of transistor 108 is connected to supply unit through connector load resistance 110
Vcc.The emitter grounding of transistor 108.The colelctor electrode of transistor 108 is further connected to illuminating source module through diode 112
104.The output end of illuminating source module 104 is grounded through biasing resistor 114.The output end of illuminating source module 104 is additionally coupled to
The end FB of controller 102.Capacitor 116 is grounded supply unit Vcc.Another capacitor 118 is grounded diode 112.
In another conventional current adjuster 100, bias resistor 114 determines that illuminating source module 104 can be flowed through
Driving current value.Controller 102 exports the enabling signal of fixation to the base stage of transistor 108 via RC wave filters 106.Transistor
108 are supplied to the predetermined drive currents of illuminating source module 104 1.For typical case, once the resistance value of bias resistor 114 is built
Vertical, then the driving current by illuminating source module 104 can not adjust.The LED luminance of illuminating source module 104 is with flowing through hair
The driving current of radiant module 104 is directly proportional.Long-term use of circuit unit may cause the driving electricity of illuminating source module 104
The not expected change of stream.In addition, the driving current in some species LED, such as organic LED (OLED) may be because that electric current is adjusted
The operation temperature of section device 100 changes and changed.As a result, the brightness of LED in illuminating source module 104 may be unfavorable for.Cause
This is, it is necessary to a kind of method and device for controlling the driving current of illuminating source module in LCD system.
As shown in Fig. 2 another embodiment of the application provides a kind of display system, including：Display device and current control
Device 260, display device can be liquid crystal display device, and it has an at least illuminating source 214, and at least an illuminating source 214 can
Can be connected in series, be connected in parallel including several (1)-(n) of series winding LED 242 (1)-(n), LED 242, or series winding with it is in parallel
Combination connects, and illuminating source 214 can include the back light for LCD system, such as small LCD systems
LED backlight light source, LED backlight light source can include various LED, such as white light LEDs, color LED and organic LED (OLED)
Deng.In addition, current controller 260, connects an at least illuminating source 214, and current controller 260 includes：Timer 221, deposit
Storage device 220, digital analog converter 222, comparator 235 and current regulator 212.Timer 221 calculates an at least illuminating source
214 total lighting time, such as the calculating that timer 221 carries out total lighting time can be started by drive signal DRV.Storage
Device 220, connection timer 221, multiple Digital reference values 226 that storage corresponds to different total lighting times respectively are configured as,
The predetermined drive currents of wherein each corresponding at least illuminating source 214 of Digital reference value 226, Digital reference value can be by emulating
Operating condition needed for illuminating source 214 and obtain.If for example, driving of the brightness of illuminating source 214 with flowing through illuminating source 214
Electric current is directly proportional, then the preferred drive current value for corresponding to brightness needed for illuminating source 214 can be as needed for emulation illuminating source 214
The operating condition of brightness and obtain, then preferred drive current value can be converted into Digital reference value using Analog to Digital Converter
And be stored in storage device 220, due to can luminescence component can have the phenomenon of light decay according to total lighting time, that is, total point
It is different that the bright 100 hours time sends brightness from the illuminating source of total 5000 hours lighting times under identical operating driving current
, the brightness of generally total 5000 hours lighting times can be less than the brightness of total 100 hours lighting times.Therefore, can be by luminous light
The predetermined drive currents in source 214 are set to directly proportional to total lighting time of illuminating source 214, that is to say, that illuminating source 214
Total lighting time it is more long, then predetermined drive currents are bigger, and light decay phenomenon is compensated to increase operating driving current.Digital-to-analogue conversion
Device 222, it is connected to storage device 220 and to change the Digital reference value 226 of at least total lighting time of an illuminating source 214
Into the first electrical parameter, such as：Digital reference value 226 is first converted into analog signal and transmits simulation letter by digital analog converter 222
Voltage reference unit 230 number is given, voltage reference unit 230 corresponds to the reference voltage signal (first of analog signal to produce
Electrical parameter), for explanation, voltage reference unit 230 is shown as independent unit, however, voltage reference unit 230 can be with
Digital analog converter 222 is merged into, for example, digital analog converter 222 can join Digital reference value 226 is converted into the first electricity
Number.Comparator 235 is voltage comparator 235, and digital analog converter 222 is electrically connected at by voltage reference unit 230, and to
Compare the first electrical parameter (such as：Reference voltage level) with the second electrical parameter of the operating driving current of corresponding illuminating source 214 (such as：
Feedback voltage level), and produce the drive signal DRV of corresponding two input voltage differences (such as：Drive bias current), and current regulation
Device 212 connects comparator 235 and the operating driving current according to a driving bias current adjustment at least illuminating source 214, at this
In embodiment, current regulator 212 includes metal-oxide semiconductor (MOS)（MOS) transistor 240, MOS transistor 240 is adjusting
The operating driving current of illuminating source 214, the gate terminal of MOS transistor 240 is connected with voltage comparator 235, and receives drive
Dynamic signal DRV, and the source terminal of MOS transistor 240 is grounded, the drain electrode end of MOS transistors 240 is further through diode D connections
Illuminating source 214, diode D are also grounded through feed-through capacitor C, and diode D is protecting illuminating source 214 to avoid controller
260 failures, and be grounded to the drainage of undesired high-frequency current through feed-through capacitor C.
In a particular application, current controller also includes detector 216, detector 216 connect illuminating source 214 and to
Measure the second electrical parameter (such as：Feedback voltage level).Detector 216 is connected with illuminating source 214, and detector 216 includes detector
Resistance Rs, detector resistance Rs correspond to the voltage FB for the operating driving current for flowing through illuminating source 214, detector electricity to determine
Resistance Rs be connected with the input of voltage comparator 235, the receiving voltage FB of voltage comparator 235 and will with from Voltage Reference list
First electrical parameter of member 230 is (such as：Reference voltage level) it is compared, and produce the drive signal of the gate terminal of MOS transistor 240
DRV, drive signal DRV drive the gate terminal of MOS transistor 240, MOS crystalline substances according to the difference between voltage FB and reference voltage level
Body pipe 240 adjusts the operating driving current of illuminating source 214 according to drive signal DRV, for example, illuminating source 214 is always lighted
Time is 5000 hours, then predetermined drive currents be 5A, the first electrical parameter (reference voltage level) be 120V, but because of lighting time mistake
Long, the operating driving current of illuminating source 214 is reduced to 3A, the second electrical parameter (voltage FB) is 100V, then voltage FB and reference
Difference between magnitude of voltage produces great drive signal DRV, and causing the operating driving current of illuminating source 214 increases,
Similarly, if the operating driving current for flowing through illuminating source 214 is excessive, voltage comparator 235 produces quite weak driving letter
Number DRV, causing the operating driving current of illuminating source 214 reduces.
Therefore, timer 221 can be set to calculate total lighting time, current controller 260 in current controller 260
Corresponding Digital reference value 226 is automatically selected according to total lighting time, and increases operating driving current according to this to compensate light decay phenomenon.
As shown in figure 3, another embodiment of the application provides a kind of display system, including：Display device and current control
Device 260, display device can be liquid crystal display device, and it has an at least illuminating source 214, and at least an illuminating source 214 can
Can be connected in series, be connected in parallel including several (1)-(n) of series winding LED 242 (1)-(n), LED 242, or series winding with it is in parallel
Combination connects, and illuminating source 214 can include the back light for LCD system, such as small LCD systems
LED backlight light source, LED backlight light source can include various LED, such as white light LEDs, color LED and organic LED (OLED)
Deng.In addition, current controller 260, connects an at least illuminating source 214, and current controller 260 includes：Timer 221, deposit
Storage device 220, digital analog converter 222, comparator 235 and current regulator 212.Timer 221 calculates an at least illuminating source
214 total lighting time, such as the calculating that timer 221 carries out total lighting time can be started by drive signal DRV.Storage
Device 220, connection timer 221, multiple Digital reference values 226 that storage corresponds to different total lighting times respectively are configured as,
The predetermined drive currents of wherein each corresponding at least illuminating source 214 of Digital reference value 226, Digital reference value can be by emulating
Operating condition needed for illuminating source 214 and obtain.If for example, driving of the brightness of illuminating source 214 with flowing through illuminating source 214
Electric current is directly proportional, then the preferred drive current value for corresponding to brightness needed for illuminating source 214 can be as needed for emulation illuminating source 214
The operating condition of brightness and obtain, then preferred drive current value can be converted into Digital reference value using Analog to Digital Converter
And be stored in storage device 220, due to can luminescence component can have the phenomenon of light decay according to total lighting time, that is, total point
It is different that the bright 100 hours time sends brightness from the illuminating source of total 5000 hours lighting times under identical operating driving current
, the brightness of generally total 5000 hours lighting times can be less than the brightness of total 100 hours lighting times.Therefore, can be by luminous light
The predetermined drive currents in source 214 are set to directly proportional to total lighting time of illuminating source 214, that is to say, that illuminating source 214
Total lighting time it is more long, then predetermined drive currents are bigger, and light decay phenomenon is compensated to increase operating driving current.Digital-to-analogue conversion
Device 222, it is connected to storage device 220 and to change the Digital reference value 226 of at least total lighting time of an illuminating source 214
Into the first electrical parameter, such as：Digital reference value 226 is first converted into analog signal and transmits simulation letter by digital analog converter 222
Current reference unit 232 number is given, current reference unit 232 corresponds to the reference current signal (first of analog signal to produce
Electrical parameter), for explanation, current reference unit 232 is shown as independent unit, however, current reference unit 232 can be with
Digital analog converter 222 is merged into, for example, digital analog converter 222 can join Digital reference value 226 is converted into the first electricity
Number.Comparator 237 is current comparator 237, and digital analog converter 222 is electrically connected at by current reference unit 232, and to
Compare the first electrical parameter (such as：Reference current value) with the second electrical parameter of the operating driving current of corresponding illuminating source 214 (such as：
Feedback current), and produce the drive signal DRV of corresponding two input current differences (such as：Drive bias current), and current regulation
Device 212 connects comparator 235 and the operating driving current according to a driving bias current adjustment at least illuminating source 214, at this
In embodiment, current regulator 212 includes metal-oxide semiconductor (MOS)（MOS) transistor 240, MOS transistor 240 is adjusting
The operating driving current of illuminating source 214, the gate terminal of MOS transistor 240 is connected with current comparator 237, and receives drive
Dynamic signal DRV, and the source terminal of MOS transistor 240 is grounded, the drain electrode end of MOS transistors 240 is further through diode D connections
Illuminating source 214, diode D are also grounded through feed-through capacitor C, and diode D is protecting illuminating source 214 to avoid controller
260 failures, and be grounded to the drainage of undesired high-frequency current through feed-through capacitor C.
In a particular application, current controller also includes detector 216, detector 216 connect illuminating source 214 and to
Measure the second electrical parameter (such as：Feedback current).Detector 216 is connected with illuminating source 214, and detector 216 includes a sensing
Resistance Rs and a pair of MOS transistors 252a and 252b.MOS transistor 252a and 252b gate terminal ground connection, MOS transistor
252b drain electrode end is connected with gate terminal.MOS transistor 252a drain electrode end is connected with current comparator 237, luminous when flowing through
When the driving current of light source 214 changes, the voltage FB on detector resistance Rs both ends can also change therewith, voltage FB change
MOS transistor 252a and 252b gate bias is caused to change so that the electric current for flowing through MOS transistor 252a drain electrode end changes
Become, when current comparator 237 detects that the electric current for flowing through MOS transistor 252b is variant with reference current value, electric current compares
Device 237 is the drive signal DRV for producing the corresponding difference, and drive signal DRV adjusts the driving current of current regulator 212,
For example, total lighting time of illuminating source 214 is 5000 hours, then predetermined drive currents are 5A, the first electrical parameter (reference current
Value) it is 5A, but because of lighting time too long, the operating driving current of illuminating source 214 is reduced to 3A, the second electrical parameter is 3A, then
Difference between electric current and reference current value produces great drive signal DRV, causes the work of illuminating source 214 to drive
Streaming current increase, similarly, if the operating driving current for flowing through illuminating source 214 is excessive, current comparator 237 produces quite
Weak drive signal DRV, causing the operating driving current of illuminating source 214 reduces.
Therefore, timer 221 can be set to calculate total lighting time, current controller 260 in current controller 260
Corresponding Digital reference value 226 is automatically selected according to total lighting time, and increases operating driving current according to this to compensate light decay phenomenon.
As shown in figure 4, another embodiment of the application provides a kind of current driving method, each step is performed with particular order
Suddenly, if however, when being performed with proper circuit, the step can be performed with the unlimited particular order, can in any order simultaneously
Carry out or carry out successively.
Step 410, the timer of total lighting time of corresponding illuminating source is calculated, and changes when always lighting of illuminating source
Between be Digital reference value, wherein Digital reference value corresponds to the predetermined drive currents of illuminating source；
Step 420, Digital reference value is then changed into the first electrical parameter（Voltage or electric current）；
Step 430, the second electrical parameter of the operating driving current of corresponding illuminating source is measured（Voltage or electric current）；
Step 440, the first electrical parameter and the second electrical parameter are compared；
Step 450, it is whether variant between the first electrical parameter and the second electrical parameter measured by judging, if variant, perform
Step 460, terminate if indifference；
Step 460, driving bias current is produced according to comparative result, to adjust the operating driving current of illuminating source, and repeated
Step 430 is performed to 450.
As shown in figure 5, another embodiment of the application provides a kind of display system, including：Display device and current control
Device 260, display device can be liquid crystal display device, and it has an at least illuminating source 214, and at least an illuminating source 214 can
Can be connected in series, be connected in parallel including several (1)-(n) of series winding LED 242 (1)-(n), LED 242, or series winding with it is in parallel
Combination connects, and illuminating source 214 can include the back light for LCD system, such as small LCD systems
LED backlight light source, LED backlight light source can include various LED, such as white light LEDs, color LED and organic LED (OLED)
Deng.In addition, current controller 260, connects an at least illuminating source 214, and current controller 260 includes：Sensing environment light device
223rd, storage device 220, digital analog converter 222, comparator 235 and current regulator 212.The sensing of sensing environment light device 223 is aobvious
Ambient brightness in front of showing device.Storage device 220, JA(junction ambient) OPTICAL SENSORS 223, it is configured as storage and corresponds to difference respectively
Multiple Digital reference values 226 of ambient brightness, wherein the corresponding at least illuminating source 214 of each Digital reference value 226 is predetermined
Driving current, Digital reference value can as needed for emulation illuminating source 214 operating condition and obtain.If for example, illuminating source 214
Brightness it is directly proportional to the driving current for flowing through illuminating source 214, then correspond to brightness needed for illuminating source 214 preferred drive electricity
Flow valuve can as needed for emulation illuminating source 214 operating condition of brightness and obtain, then preferred drive current value can utilize mould
Plan is converted into Digital reference value to digital quantizer and is stored in storage device 220, because human eye is in brighter environment
The backlight that comparison is high is needed, can just see the content in display device, and can be caused than dark environment, too high backlight
Eyes are uncomfortable or even injure, and now then need relatively low back lighting.Digital reference 226 enters for different ambient brightness
The control of the different degrees of operating driving current of row.Therefore, the predetermined drive currents of illuminating source 214 can be set to and environment
Brightness is directly proportional, that is to say, that ambient brightness is brighter, then predetermined drive currents are bigger, to increase operating driving current to produce
Higher backlight.Digital analog converter 222, it is connected to storage device 220 and to change the ambient brightness in front of display device
Digital reference value 226 into the first electrical parameter, such as：Digital reference value 226 is first converted into analog signal by digital analog converter 222
And transmit analog signal and correspond to the reference of analog signal to voltage reference unit 230, voltage reference unit 230 to produce
Voltage signal (the first electrical parameter), voltage reference unit 230 is shown as independent unit, however, voltage reference unit 230 can be with
Digital analog converter 222 is merged into, for example, digital analog converter 222 can join Digital reference value 226 is converted into the first electricity
Number.Comparator 235 is voltage comparator 235, and digital analog converter 222 is electrically connected at by voltage reference unit 230, and to
Compare the first electrical parameter (such as：Reference voltage level) with the second electrical parameter of the operating driving current of corresponding illuminating source 214 (such as：
Feedback voltage level), and produce the drive signal DRV of corresponding two input voltage differences (such as：Drive bias current), and current regulation
Device 212 connects comparator 235 and the operating driving current according to a driving bias current adjustment at least illuminating source 214, at this
In embodiment, current regulator 212 includes metal-oxide semiconductor (MOS)（MOS) transistor 240, MOS transistor 240 is adjusting
The operating driving current of illuminating source 214, the gate terminal of MOS transistor 240 is connected with voltage comparator 235, and receives drive
Dynamic signal DRV, and the source terminal of MOS transistor 240 is grounded, the drain electrode end of MOS transistors 240 is further through diode D connections
Illuminating source 214, diode D are also grounded through feed-through capacitor C, and diode D is protecting illuminating source 214 to avoid controller
260 failures, and be grounded to the drainage of undesired high-frequency current through feed-through capacitor C.
In a particular application, current controller also includes detector 216, detector 216 connect illuminating source 214 and to
Measure the second electrical parameter (such as：Feedback voltage level).Detector 216 is connected with illuminating source 214, and detector 216 includes detector
Resistance Rs, detector resistance Rs correspond to the voltage FB for the operating driving current for flowing through illuminating source 214, detector electricity to determine
Resistance Rs be connected with the input of voltage comparator 235, the receiving voltage FB of voltage comparator 235 and will with from Voltage Reference list
First electrical parameter of member 230 is (such as：Reference voltage level) it is compared, and produce the drive signal of the gate terminal of MOS transistor 240
DRV, drive signal DRV drive the gate terminal of MOS transistor 240, MOS crystalline substances according to the difference between voltage FB and reference voltage level
Body pipe 240 adjusts the operating driving current of illuminating source 214 according to drive signal DRV, for example, the environment in front of display device is bright
Spend for 200nits, then predetermined drive currents be 5A, the first electrical parameter (reference voltage level) be 120V, but now illuminating source 214
Operating driving current be only that 3A, the second electrical parameter (voltage FB) are 100V, then the difference between voltage FB and reference voltage level
Great drive signal DRV is produced, causing the operating driving current of illuminating source 214 increases, to produce the higher back of the body
Light, similarly, if the operating driving current for flowing through illuminating source 214 is excessive, voltage comparator 235 produces quite weak driving
Signal DRV, causing the operating driving current of illuminating source 214 reduces.
Therefore, the environment in front of the sensing display device of sensing environment light device 223 can be set bright in current controller 260
Degree, the Digital reference value 226 according to corresponding to automatically selecting ambient brightness of current controller 260, and task driven electricity is adjusted according to this
Stream.
As shown in fig. 6, another embodiment of the application provides a kind of display system, including：Display device and current control
Device 260, display device can be liquid crystal display device, and it has an at least illuminating source 214, and at least an illuminating source 214 can
Can be connected in series, be connected in parallel including several (1)-(n) of series winding LED 242 (1)-(n), LED 242, or series winding with it is in parallel
Combination connects, and illuminating source 214 can include the back light for LCD system, such as small LCD systems
LED backlight light source, LED backlight light source can include various LED, such as white light LEDs, color LED and organic LED (OLED)
Deng.In addition, current controller 260, connects an at least illuminating source 214, and current controller 260 includes：Sensing environment light device
223rd, storage device 220, digital analog converter 222, comparator 235 and current regulator 212.The sensing of sensing environment light device 223 is aobvious
Ambient brightness in front of showing device.Storage device 220, JA(junction ambient) OPTICAL SENSORS 223, it is configured as storage and corresponds to difference respectively
Multiple Digital reference values 226 of ambient brightness, wherein the corresponding at least illuminating source 214 of each Digital reference value 226 is predetermined
Driving current, Digital reference value can as needed for emulation illuminating source 214 operating condition and obtain.If for example, illuminating source 214
Brightness it is directly proportional to the driving current for flowing through illuminating source 214, then correspond to brightness needed for illuminating source 214 preferred drive electricity
Flow valuve can as needed for emulation illuminating source 214 operating condition of brightness and obtain, then preferred drive current value can utilize mould
Plan is converted into Digital reference value to digital quantizer and is stored in storage device 220, because human eye is in brighter environment
The backlight that comparison is high is needed, can just see the content in display device, and can be caused than dark environment, too high backlight
Eyes are uncomfortable or even injure, and now then need relatively low back lighting.Digital reference 226 enters for different ambient brightness
The control of the different degrees of operating driving current of row.Therefore, the predetermined drive currents of illuminating source 214 can be set to and environment
Brightness is directly proportional, that is to say, that ambient brightness is brighter, then predetermined drive currents are bigger, to increase operating driving current to produce
Higher backlight.Digital analog converter 222, it is connected to storage device 220 and to change the ambient brightness in front of display device
Digital reference value 226 into the first electrical parameter, such as：Digital reference value 226 is first converted into analog signal by digital analog converter 222
And transmit analog signal and correspond to the reference of analog signal to current reference unit 232, current reference unit 232 to produce
Current signal (the first electrical parameter), for explanation, current reference unit 232 is shown as independent unit, however, electric current is joined
Digital analog converter 222 can be merged into by examining unit 232, for example, digital analog converter 222 can be to by 226 turns of Digital reference value
Change the first electrical parameter into.Comparator 237 is current comparator 237, and digital-to-analogue conversion is electrically connected at by current reference unit 232
Device 222, and to compare the first electrical parameter (such as：Reference current value) with the operating driving current of corresponding illuminating source 214
Two electrical parameters are (such as：Feedback current), and produce the drive signal DRV of corresponding two input current differences (such as：Drive biased electrical
Stream), and the connection comparator 235 of current regulator 212 and the work according to a driving bias current adjustment at least illuminating source 214
Driving current, in the present embodiment, current regulator 212 include metal-oxide semiconductor (MOS)（MOS) transistor 240, MOS crystal
To adjust the operating driving current of illuminating source 214, gate terminal and the current comparator 237 of MOS transistor 240 connect pipe 240
Connect, and receive drive signal DRV, and the source terminal of MOS transistor 240 is grounded, the drain electrode end of MOS transistors 240 is further
Through diode D connections illuminating source 214, diode D is also grounded through feed-through capacitor C, and diode D is protecting illuminating source
214 avoid the failure of controller 260, and are grounded to the drainage of undesired high-frequency current through feed-through capacitor C.
In a particular application, current controller also includes detector 216, detector 216 connect illuminating source 214 and to
Measure the second electrical parameter (such as：Feedback current).Detector 216 is connected with illuminating source 214, and detector 216 includes induced electricity
Hinder Rs and a pair of MOS transistors 252a and 252b.MOS transistor 252a and 252b gate terminal ground connection, MOS transistor 252b
Drain electrode end be connected with gate terminal.MOS transistor 252a drain electrode end is connected with current comparator 237, when flowing through illuminating source
When 214 driving current changes, the voltage FB on detector resistance Rs both ends can also change therewith, and voltage FB change causes
MOS transistor 252a and 252b gate bias change so that and the electric current for flowing through MOS transistor 252a drain electrode end changes, when
When current comparator 237 detects the electric current and variant reference current value for flowing through MOS transistor 252b, current comparator 237
The drive signal DRV of the corresponding difference is produced, drive signal DRV adjusts the driving current of current regulator 212, for example,
Ambient brightness in front of display device is 200nits, then predetermined drive currents be 5A, the first electrical parameter (reference current value) be
5A, the but now operating driving current of illuminating source 214 is only that 3A, the second electrical parameter are 3A, then electric current and reference current value it
Between difference i.e. produce great drive signal DRV, causing the operating driving current of illuminating source 214 increase, with generation compared with
High backlight, similarly, if the operating driving current for flowing through illuminating source 214 is excessive, current comparator 237 produces quite weak
Drive signal DRV, causing the operating driving current of illuminating source 214 reduces.
Therefore, sensing environment light device 223 can be set bright with the environment in front of sensing display device in current controller 260
Degree, the Digital reference value 226 according to corresponding to automatically selecting ambient brightness of current controller 260, and task driven electricity is adjusted according to this
Stream.
As shown in fig. 7, another embodiment of the application provides a kind of current driving method, each step is performed with particular order
Suddenly, if however, when being performed with proper circuit, the step can be performed with the unlimited particular order, can in any order simultaneously
Carry out or carry out successively.
Step 411, the sensing environment light device of the ambient brightness in front of corresponding display device is sensed, and switching environment brightness is
Digital reference value, wherein Digital reference value correspond to the predetermined drive currents of illuminating source；
Step 421, Digital reference value is then changed into the first electrical parameter（Voltage or electric current）；
Step 431, the second electrical parameter of the operating driving current of corresponding illuminating source is measured（Voltage or electric current）；
Step 441, the first electrical parameter and the second electrical parameter are compared；
Step 451, it is whether variant between the first electrical parameter and the second electrical parameter measured by judging, if variant, perform
Step 461, if during indifference, terminate；
Step 461, driving bias current is produced according to comparative result, to adjust the operating driving current of illuminating source, and repeated
Step 431 is performed to 451.
As shown in figure 8, another embodiment of the application provides a kind of display system, including：Display device and current control
Device 260, display device can be liquid crystal display device, and it has an at least illuminating source 214, and at least an illuminating source 214 can
Can be connected in series, be connected in parallel including several (1)-(n) of series winding LED 242 (1)-(n), LED 242, or series winding with it is in parallel
Combination connects, and illuminating source 214 can include the back light for LCD system, such as small LCD systems
LED backlight light source, LED backlight light source can include various LED, such as white light LEDs, color LED and organic LED (OLED)
Deng.In addition, current controller 260, connects an at least illuminating source 214, and current controller 260 includes：Operating temperature senses
Device 224, storage device 220, digital analog converter 222, comparator 235 and current regulator 212.Operating temperature sensor 224 is felt
Survey the operating temperature of illuminating source 214.Storage device 220, connection operating temperature sensor 224, it is right respectively to be configured as storage
Multiple Digital reference values 226 of different operating temperature are answered, wherein the corresponding at least illuminating source 214 of each Digital reference value 226
Predetermined drive currents, Digital reference value can as needed for emulation illuminating source 214 operating condition and obtain.It is if for example, luminous
The brightness of light source 214 is directly proportional to the driving current for flowing through illuminating source 214, then correspond to brightness needed for illuminating source 214 compared with
Good driving current value can as needed for emulation illuminating source 214 operating condition of brightness and obtain, then preferred drive current value can
To be converted into Digital reference value using Analog to Digital Converter and be stored in storage device 220, due to illuminating source 214
At different temperature, with identical operating driving current illuminating source 214, different brightness, the work of illuminating source 214 are had
Make that temperature is higher, have brighter brightness, it is therefore desirable to reduce operating driving current.Digital reference 226 is directed to different works
Make the control that temperature carries out different degrees of operating driving current.Therefore, the predetermined drive currents of illuminating source 214 can be set
It is inversely proportional into operating temperature, that is to say, that operating temperature is higher, then predetermined drive currents are smaller, to reduce task driven electricity
Stream.Digital analog converter 222, it is connected to storage device 220 and to change the Digital reference value of the operating temperature of illuminating source 214
226 into the first electrical parameter, such as：Digital reference value 226 is first converted into analog signal and transmits mould by digital analog converter 222
Intend signal and correspond to the reference voltage signal of analog signal to voltage reference unit 230, voltage reference unit 230 to produce
(the first electrical parameter), voltage reference unit 230 is shown as independent unit, however, voltage reference unit 230 can be merged into number
Weighted-voltage D/A converter 222, for example, digital analog converter 222 can be being converted into the first electrical parameter by Digital reference value 226.Comparator
235 be voltage comparator 235, and digital analog converter 222 is electrically connected at by voltage reference unit 230, and to compare first
Electrical parameter is (such as：Reference voltage level) with the second electrical parameter of the operating driving current of corresponding illuminating source 214 (such as：Feedback voltage
Value), and produce the drive signal DRV of corresponding two input voltage differences (such as：Drive bias current), and current regulator 212 connects
Comparator 235 and the operating driving current according to a driving bias current adjustment at least illuminating source 214 are connect, in the present embodiment
In, current regulator 212 includes metal-oxide semiconductor (MOS)（MOS) transistor 240, MOS transistor 240 is adjusting luminous light
The operating driving current in source 214, the gate terminal of MOS transistor 240 is connected with voltage comparator 235, and receives drive signal
DRV, and the source terminal of MOS transistor 240 is grounded, the drain electrode end of MOS transistors 240 is further through the luminous light of diode D connections
Source 214, diode D also through feed-through capacitor C be grounded, diode D to protect illuminating source 214 to avoid the failure of controller 260,
And it is grounded to the drainage of undesired high-frequency current through feed-through capacitor C.
In a particular application, current controller also includes detector 216, detector 216 connect illuminating source 214 and to
Measure the second electrical parameter (such as：Feedback voltage level).Detector 216 is connected with illuminating source 214, and detector 216 includes detector
Resistance Rs, detector resistance Rs correspond to the voltage FB for the operating driving current for flowing through illuminating source 214, detector electricity to determine
Resistance Rs be connected with an input of voltage comparator 235, the receiving voltage FB of voltage comparator 235 and will with from Voltage Reference
First electrical parameter of unit 230 is (such as：Reference voltage level) it is compared, and produce the driving letter of the gate terminal of MOS transistor 240
Number DRV, drive signal DRV drive the gate terminal of MOS transistor 240, MOS according to the difference between voltage FB and reference voltage level
Transistor 240 adjusts the operating driving current of illuminating source 214 according to drive signal DRV, for example, the work of illuminating source 214
Temperature is 50 degree, then predetermined drive currents be 5A, the first electrical parameter (reference voltage level) be 120V, but now illuminating source 214
Operating driving current be only that 3A, the second electrical parameter (voltage FB) are 100V, then the difference between voltage FB and reference voltage level
Great drive signal DRV is produced, causing the operating driving current of illuminating source 214 increases, higher bright to produce
Degree, similarly, if the operating driving current for flowing through illuminating source 214 is excessive, voltage comparator 235 produces quite weak driving
Signal DRV, causing the operating driving current of illuminating source 214 reduces.
Therefore, operating temperature sensor 224 can be set to sense the work temperature of illuminating source 214 in current controller 260
Degree, the Digital reference value 226 according to corresponding to automatically selecting operating temperature of current controller 260, and task driven electricity is adjusted according to this
Stream.
As shown in figure 9, another embodiment of the application provides a kind of display system, including：Display device and current control
Device 260, display device can be liquid crystal display device, and it has an at least illuminating source 214, and at least an illuminating source 214 can
Can be connected in series, be connected in parallel including several (1)-(n) of series winding LED 242 (1)-(n), LED 242, or series winding with it is in parallel
Combination connects, and illuminating source 214 can include a back light for being used for LCD system, such as small LCD systems
LED backlight light source, LED backlight light source can include various LED, such as white light LEDs, color LED and organic LED (OLED)
Deng.In addition, current controller 260, connects an at least illuminating source 214, and current controller 260 includes：Operating temperature senses
Device 224, storage device 220, digital analog converter 222, comparator 235 and current regulator 212.Operating temperature sensor 224 is felt
Survey the operating temperature of illuminating source 214.Storage device 220, connection operating temperature sensor 224, it is right respectively to be configured as storage
Multiple Digital reference values 226 of different operating temperature are answered, wherein the corresponding at least illuminating source 214 of each Digital reference value 226
Predetermined drive currents, Digital reference value can as needed for emulation illuminating source 214 operating condition and obtain.It is if for example, luminous
The brightness of light source 214 is directly proportional to the driving current for flowing through illuminating source 214, then correspond to brightness needed for illuminating source 214 compared with
Good driving current value can as needed for emulation illuminating source 214 operating condition of brightness and obtain, then preferred drive current value can
To be converted into Digital reference value using Analog to Digital Converter and be stored in storage device 220, due to illuminating source 214
At different temperature, with identical operating driving current illuminating source 214, different brightness, the work of illuminating source 214 are had
Make that temperature is higher, have brighter brightness, it is therefore desirable to reduce operating driving current.Digital reference 226 is directed to different works
Make the control that temperature carries out different degrees of operating driving current.Therefore, the predetermined drive currents of illuminating source 214 can be set
It is inversely proportional into operating temperature, that is to say, that operating temperature is higher, then predetermined drive currents are smaller, to reduce task driven electricity
Stream.Digital analog converter 222, it is connected to storage device 220 and to change the Digital reference value of the operating temperature of illuminating source 214
226 into the first electrical parameter, such as：Digital reference value 226 is first converted into analog signal and transmits mould by digital analog converter 222
Intend signal and correspond to the reference current signal of analog signal to current reference unit 232, current reference unit 232 to produce
(the first electrical parameter), current reference unit 232 is shown as independent unit, however, current reference unit 232 can be merged into number
Weighted-voltage D/A converter 222, for example, digital analog converter 222 can be being converted into the first electrical parameter by Digital reference value 226.Comparator
237 be current comparator 237, and digital analog converter 222 is electrically connected at by current reference unit 232, and to compare first
Electrical parameter is (such as：Reference current value) with the second electrical parameter of the operating driving current of corresponding illuminating source 214 (such as：Feedback current
Value), and produce the drive signal DRV of corresponding two input current differences (such as：Drive bias current), and current regulator 212 connects
Comparator 235 and the operating driving current according to a driving bias current adjustment at least illuminating source 214 are connect, in the present embodiment
In, current regulator 212 includes metal-oxide semiconductor (MOS)（MOS) transistor 240, MOS transistor 240 is adjusting luminous light
The operating driving current in source 214, the gate terminal of MOS transistor 240 is connected with current comparator 237, and receives drive signal
DRV, and the source terminal of MOS transistor 240 is grounded, the drain electrode end of MOS transistors 240 is further through the luminous light of diode D connections
Source 214, diode D also through feed-through capacitor C be grounded, diode D to protect illuminating source 214 to avoid the failure of controller 260,
And it is grounded to the drainage of undesired high-frequency current through feed-through capacitor C.
In a particular application, current controller also includes detector 216, detector 216 connect illuminating source 214 and to
Measure the second electrical parameter (such as：Feedback current).Detector 216 is connected with illuminating source 214, and detector 216 includes induced electricity
Hinder Rs and a pair of MOS transistors 252a and 252b.MOS transistor 252a and 252b gate terminal ground connection, MOS transistor 252b
Drain electrode end be connected with gate terminal.MOS transistor 252a drain electrode end is connected with current comparator 237, when flowing through illuminating source
When 214 driving current changes, the voltage FB on detector resistance Rs both ends can also change therewith, and voltage FB change causes
MOS transistor 252a and 252b gate bias change so that and the electric current for flowing through MOS transistor 252a drain electrode end changes, when
When current comparator 237 detects the electric current and variant reference current value for flowing through MOS transistor 252b, current comparator 237
The drive signal DRV of the corresponding difference is produced, drive signal DRV adjusts the driving current of current regulator 212, for example,
The operating temperature of illuminating source 214 be 50 degree, then predetermined drive currents be 5A, the first electrical parameter (reference voltage level) be 120V,
But now the operating driving current of illuminating source 214 is only that 3A, the second electrical parameter (voltage FB) are 100V, then voltage FB and ginseng
Examine the difference between magnitude of voltage and produce great drive signal DRV, cause the operating driving current of illuminating source 214 to increase
Add, to produce higher brightness, similarly, and if the operating driving current for flowing through illuminating source 214 is excessive, voltage comparator
235 produce quite weak drive signal DRV, and causing the operating driving current of illuminating source 214 reduces.
Therefore, can operating temperature sensor 224 be set in current controller 260 to sense the work of illuminating source 214
Temperature, the Digital reference value 226 according to corresponding to automatically selecting operating temperature of current controller 260, and task driven is adjusted according to this
Electric current.
In addition, in a particular application, display system, the knot that can be sensed simultaneously according to ambient brightness sensing and operating temperature
Fruit, to adjust operating driving current, such as display system can include simultaneously：Sensing environment light device 223 and operating temperature sensor
224.Ambient brightness in front of the sensing display device of sensing environment light device 223, and operating temperature sensor 224 sense illuminating source
214 operating temperature, and the JA(junction ambient) OPTICAL SENSORS 223 of storage device 220 and operating temperature sensor 224, are configured as depositing
Storage corresponds to multiple Digital reference values 226 of varying environment brightness and different operating temperature respectively, wherein each Digital reference value 226
The predetermined drive currents of corresponding at least illuminating source 214, Digital reference value can as needed for emulation illuminating source 214 operating condition
And obtain.Therefore, current controller 260 can according to corresponding to automatically selecting ambient brightness and operating temperature Digital reference value 226, and
Operating driving current is adjusted according to this.
As shown in Figure 10, another embodiment of the application provides a kind of current driving method, and each step is performed with particular order
Suddenly, if however, when being performed with proper circuit, the step can be performed with the unlimited particular order, can in any order simultaneously
Carry out or carry out successively.
Step 412, the operating temperature sensor of the operating temperature of corresponding illuminating source is sensed, and conversion work temperature is number
Word reference value, wherein Digital reference value correspond to the predetermined drive currents of illuminating source；
Step 422, Digital reference value is then changed into the first electrical parameter（Voltage or electric current）；
Step 432, the second electrical parameter of the operating driving current of corresponding illuminating source is measured（Voltage or electric current）；
Step 442, the first electrical parameter and the second electrical parameter are compared；
Step 452, it is whether variant between the first electrical parameter and the second electrical parameter measured by judging, if variant, perform
Step 462, if during indifference, terminate；
Step 462, driving bias current is produced according to comparative result, to adjust the operating driving current of illuminating source, and repeated
Step 432 is performed to 452.
As shown in figure 11, another embodiment of the application provides a kind of display system, including：Display device and current control
Device 260, display device can be liquid crystal display device, and it has an at least illuminating source 214, and at least an illuminating source 214 can
Can be connected in series, be connected in parallel including several (1)-(n) of series winding LED 242 (1)-(n), LED 242, or series winding with it is in parallel
Combination connects, and illuminating source 214 can include the back light for LCD system, such as small LCD systems
LED backlight light source, LED backlight light source can include various LED, such as white light LEDs, color LED and organic LED (OLED)
Deng.In addition, current controller 260, connects an at least illuminating source 214, and current controller 260 includes：Use condition 225,
First storage device 220, the first digital analog converter 222, the second storage device 253, the second digital analog converter 254, comparator
235th, OPTICAL SENSORS 251 and current regulator 212.Use condition 225 can include sensing illuminating source 214 operating temperature,
Ambient brightness in front of total lighting time of illuminating source 214, display device.First storage device 220, connect use condition
225, multiple first Digital reference values 226 that storage corresponds to different use conditions 225 respectively are configured as, wherein each first number
The predetermined drive currents of the corresponding at least illuminating source 214 of word reference value 226, the first Digital reference value 226 can be sent out by emulation
Operating condition needed for radiant 214 and obtain.If for example, driving electricity of the brightness of illuminating source 214 with flowing through illuminating source 214
Flow directly proportional, then the preferred drive current value for corresponding to brightness needed for illuminating source 214 can be bright as needed for emulation illuminating source 214
The operating condition of degree and obtain, then preferred drive current value can be converted into the first digital reference using Analog to Digital Converter
It is worth and is stored in first storage device 220, due under different use conditions 225, illuminating source 214 has different bright
The demands such as degree, operating driving current, it is therefore desirable to adjust the operating driving current of illuminating source 214.First digital reference 226 is
The control of different degrees of operating driving current is carried out for different use conditions 225.First digital analog converter 222, connection
In first storage device 220 and to change the first Digital reference value 226 of the operating temperature of illuminating source 214 into the first electricity ginseng
Number, such as：First Digital reference value 226 is first converted into analog signal and transmits analog signal by the first digital analog converter 222
To first voltage reference unit 230, first voltage reference unit 230 corresponds to the reference voltage signal of analog signal to produce
(the first electrical parameter), for explanation, first voltage reference unit 230 is shown as independent unit, however, first voltage is joined
The first digital analog converter 222 can be merged into by examining unit 230, for example, the first digital analog converter 222 can be to digital by first
Reference value 226 is converted into the first electrical parameter.In addition, identical, OPTICAL SENSORS 251 can sense the brightness of illuminating source 214.The
Two storage devices 252, connect OPTICAL SENSORS 251, be configured as storage correspond to respectively different illuminating sources 214 brightness it is multiple
Second Digital reference value 253, wherein the task driven electricity of the corresponding at least illuminating source 214 of each second Digital reference value 253
Stream, the second Digital reference value 253 can as needed for emulation illuminating source 214 operating condition and obtain.If for example, illuminating source
214 brightness is directly proportional to the operating driving current for flowing through illuminating source 214, then corresponds to the work of the brightness of illuminating source 214
Driving current value can be obtained by the operating condition of emulation illuminating source 214, and then operating driving current value can utilize simulation
Digital reference value 253 is converted into digital quantizer and is stored in the second storage device 252.Second digital analog converter 254,
It is connected to the second storage device 252 and to change the second Digital reference value 253 of the brightness of illuminating source 214 into the second electricity ginseng
Number, such as：Second Digital reference value 253 is first converted into analog signal and transmits analog signal by the second digital analog converter 222
To second voltage reference unit 255, second voltage reference unit 255 corresponds to the second electrical parameter of analog signal to produce,
For explanation, second voltage reference unit 255 is shown as independent unit, however, second voltage reference unit 255 can be with
The second digital analog converter 254 is merged into, for example, the second digital analog converter 254 can be the second Digital reference value 253 to be changed
Into the second electrical parameter.Comparator 235 is voltage comparator 235, and the first number is electrically connected at by first voltage reference unit 230
Weighted-voltage D/A converter 222 and the second digital analog converter 254 is electrically connected at by second voltage reference unit 255, and to compare
One electrical parameter is (such as：Reference voltage level) and the second electrical parameter is (such as：Feedback voltage level), and produce corresponding two input voltage differences
Drive signal DRV is (such as：Drive bias current), and current regulator 212 connect comparator 235 and according to driving bias current adjust
The operating driving current of a whole at least illuminating source 214, in the present embodiment, current regulator 212 include metal oxide half
Conductor（MOS) transistor 240, MOS transistor 240 is adjusting the operating driving current of illuminating source 214, MOS transistor 240
Gate terminal be connected with voltage comparator 235, and receive drive signal DRV, and the source terminal of MOS transistor 240 is grounded,
Further through diode D connections illuminating source 214, diode D also connects the drain electrode end of MOS transistors 240 through feed-through capacitor C
Ground, diode D drain warp to protect illuminating source 214 to avoid the failure of controller 260, and to undesired high-frequency current
Feed-through capacitor C is grounded.
In a particular application, voltage comparator 235 receives the second electrical parameter (such as：Feedback voltage level) and will with from
First electrical parameter of one voltage reference unit 230 is (such as：Reference voltage level) it is compared, and produce the grid of MOS transistor 240
The drive signal DRV at end, drive signal DRV drive MOS transistor 240 according to the difference between voltage FB and reference voltage level
Gate terminal, MOS transistor 240 adjusts the operating driving current of illuminating source 214 according to drive signal DRV, for example, use condition
225 be the ambient brightness in front of display device, if the ambient brightness in front of display device is 200nits, predetermined drive currents
It is 120V for 5A, the first electrical parameter (reference voltage level), but the brightness that now OPTICAL SENSORS 251 senses illuminating source 214 is
100nits, brightness be 100nits corresponding to operating driving current be only that 3A, the second electrical parameter (feedback voltage level) are 100V, then
Difference between first electrical parameter and the second electrical parameter produces great drive signal DRV, causes illuminating source 214
Operating driving current increase, to produce higher backlight, similarly, if the brightness of illuminating source 214 is excessively bright, corresponding work is driven
Streaming current is excessive, then voltage comparator 235 produces quite weak drive signal DRV, reduces the task driven electricity of illuminating source 214
Stream.
Therefore, condition 225 can be set using in current controller 260, current controller 260 is according to use condition 225
Digital reference value 226 corresponding to automatically selecting, and the operating driving current of illuminating source 214 is not measured, but light sensation is set
Device 251 is surveyed, brightness is directly sensed, to avoid the brightness caused by total lighting time or different operating temperature under same current
Drop so that adjustment operating driving current is more accurate.
As shown in figure 12, another embodiment of the application provides a kind of display system, including：Display device and current control
Device 260, display device can be liquid crystal display device, and it has an at least illuminating source 214, and at least an illuminating source 214 can
Can be connected in series, be connected in parallel including several (1)-(n) of series winding LED 242 (1)-(n), LED 242, or series winding with it is in parallel
Combination connects, and illuminating source 214 can include the back light for LCD system, such as small LCD systems
LED backlight light source, LED backlight light source can include various LED, such as white light LEDs, color LED and organic LED (OLED)
Deng.In addition, current controller 260, connects an at least illuminating source 214, and current controller 260 includes：Use condition 225,
First storage device 220, the first digital analog converter 222, the second storage device 253, the second digital analog converter 254, comparator
235th, OPTICAL SENSORS 251 and current regulator 212.Use condition 225 can include sensing illuminating source 214 operating temperature,
Ambient brightness in front of total lighting time of illuminating source 214, display device.First storage device 220, connect use condition
225, it is configured as storage and corresponds to different multiple first Digital reference values 226 with condition 225 respectively, wherein each first numeral
The predetermined drive currents of the corresponding at least illuminating source 214 of reference value 226, the first Digital reference value can be by emulation illuminating source
Operating condition needed for 214 and obtain.For example, if the brightness of illuminating source 214 is with flowing through the driving current of illuminating source 214 into just
Than, then correspond to brightness needed for illuminating source 214 preferred drive current value can as needed for emulation illuminating source 214 brightness behaviour
Make condition and obtain, then preferred drive current value can be converted into using Analog to Digital Converter the first Digital reference value and
It is stored in first storage device 220, because under different use conditions 225, illuminating source 214 has different brightness, work
Make the demands such as driving current, it is therefore desirable to adjust the operating driving current of illuminating source 214.First digital reference 226 is directed to
Different use conditions 225 carries out the control of different degrees of operating driving current.First digital analog converter 222, it is connected to
One storage device 220 and to change the first Digital reference value 226 of the operating temperature of illuminating source 214 into the first electrical parameter,
Such as：First digital analog converter 222 first by the first Digital reference value 226 be converted into analog signal and transmit analog signal to
To the first current reference unit 232, the first current reference unit 232 corresponds to the reference current signal of analog signal to produce
(the first electrical parameter), for explanation, the first current reference unit 232 are shown as independent unit, however, the first electric current is joined
The first digital analog converter 222 can be merged into by examining unit 232, for example, the first digital analog converter 222 can be to by digital reference
Value 226 is converted into the first electrical parameter.In addition, identical, OPTICAL SENSORS 251 can sense the brightness of illuminating source 214.Second deposits
Storage device 252, OPTICAL SENSORS 251 is connected, be configured as storage corresponds to the brightness of different illuminating sources 214 respectively multiple second
Digital reference value 253, wherein the operating driving current of the corresponding at least illuminating source 214 of each second Digital reference value 253, the
Two Digital reference values 253 can as needed for emulation illuminating source 214 operating condition and obtain.For example, if illuminating source 214 is bright
Spend directly proportional to the operating driving current for flowing through illuminating source 214, then correspond to the operating driving current of the brightness of illuminating source 214
Value can be obtained by the operating condition of emulation illuminating source 214, and then operating driving current value can utilize simulation to turn numeral
Parallel operation is converted into Digital reference value 253 and is stored in the second storage device 252.Second digital analog converter 254, it is connected to
Two storage devices 252 and to change the second Digital reference value 253 of the brightness of illuminating source 214 into the second electrical parameter, such as：
Second Digital reference value 253 is first converted into analog signal and transmits analog signal to the second electricity by the second digital analog converter 222
Reference unit 256 is flowed, the second current reference unit 256 corresponds to the second electrical parameter of analog signal to produce, in order to illustrate
For the sake of, second voltage reference unit 256 is shown as independent unit, however, second voltage reference unit 256 can be merged into
Two digital analog converters 254, for example, the second digital analog converter 254 can be electric the second Digital reference value 253 is converted into second
Parameter.Comparator 237 is current comparator 237, and the first digital analog converter is electrically connected at by the first current reference unit 232
222 and the second digital analog converter 254 is electrically connected at by second voltage reference unit 256, and to compare the first electrical parameter
(such as：Reference current value) and the second electrical parameter is (such as：Feedback current), and produce the drive signal of corresponding two input current differences
DRV is (such as：Drive bias current), and current regulator 212 connect comparator 235 and according to driving bias current adjustment at least one
The operating driving current of illuminating source 214, in the present embodiment, current regulator 212 include metal-oxide semiconductor (MOS)（MOS)
Transistor 240, MOS transistor 240 is adjusting the operating driving current of illuminating source 214, the gate terminal of MOS transistor 240
It is connected with current comparator 237, and receives drive signal DRV, and the source terminal of MOS transistor 240 is grounded, MOS transistors
240 drain electrode end is further also grounded through diode D connections illuminating source 214, diode D through feed-through capacitor C, diode D
To protect illuminating source 214 to avoid the failure of controller 260, and to the drainage of undesired high-frequency current through feed-through capacitor
C is grounded.
In a particular application, when current comparator 237 detects the second electrical parameter and the first electrical parameter is variant, electric current
Comparator 237 is the drive signal DRV for producing the corresponding difference, and the driving of drive signal DRV adjustment current regulators 212 is electric
Stream, for example, use condition 225 is the ambient brightness in front of display device, if the ambient brightness in front of display device is
200nits, then predetermined drive currents be 5A, the first electrical parameter (reference current value) be 5A, but now OPTICAL SENSORS 251 sensing hair
The brightness of radiant 214 is 100nits, and brightness is that operating driving current corresponding to 100nits is only that 3A, the second electrical parameter are (anti-
Feed flow valuve) be 3A, then the difference between the first electrical parameter and the second electrical parameter produces a great drive signal DRV,
Causing the operating driving current of illuminating source 214 increases, to produce higher backlight, similarly, if illuminating source 214 is bright
Spend bright, corresponding operating driving current is excessive, then current comparator 237 produces quite weak drive signal DRV, reduces luminous
The operating driving current of light source 214.
Therefore, condition 225 can be set using in current controller 260, current controller 260 is according to use condition 225
Digital reference value 226 corresponding to automatically selecting, and the operating driving current of illuminating source 214 is not measured, but light sensation is set
Device 251 is surveyed, brightness is directly sensed, to avoid the brightness caused by total lighting time or different operating temperature under same current
Drop, by sensing operating driving current corresponding to brightness acquirement so that adjustment operating driving current is more accurate.
As shown in figure 13, another embodiment of the application provides a kind of current driving method, in the present embodiment, with specific suitable
Sequence performs each step, if however, when being performed with proper circuit, the step can be performed with the unlimited particular order, Ke Yiren
What order is carried out or carried out successively simultaneously.
Step 413, use condition is changed as the first Digital reference value, wherein the first Digital reference value corresponds to illuminating source
Predetermined drive currents；
Step 423, Digital reference value is then changed into the first electrical parameter（Voltage or electric current）；
Step 433, the brightness of corresponding illuminating source is sensed, and changes the brightness of illuminating source as the second Digital reference value, then
The second Digital reference value is changed into the second electrical parameter（Voltage or electric current）, wherein the second Digital reference value corresponds to the work of illuminating source
Make driving current；
Step 443, the first electrical parameter and the second electrical parameter are compared；
Step 453, it is whether variant between the first electrical parameter and the second electrical parameter measured by judging, if variant, perform
Step 463, if during indifference, terminate；
Step 463, driving bias current is produced according to comparative result, to adjust the operating driving current of illuminating source, and repeated
Step 433 is performed to 453.
Based on above-mentioned, the application is provided according to different use conditions to control the work of illuminating source in liquid crystal display systems
The current driving method and display system of driving current.In addition, the application measures the task driven of illuminating source 214 except that can adopt
Outside electric current, the operating driving current of illuminating source 214 can not be also measured, but OPTICAL SENSORS 251 is set, directly senses brightness
Operating driving current corresponding to acquirement, to avoid the brightness caused by total lighting time or different operating temperature under same current
Drop, by sensing operating driving current corresponding to brightness acquirement so that adjustment operating driving current is more accurate.
It should be noted that in the above-described embodiments, the description to each embodiment all emphasizes particularly on different fields, in some embodiment
The part being not described in, it may refer to the associated description of other embodiment.
Described above, the only embodiment of the application, but the protection domain of the application is not limited thereto is any
Those familiar with the art can readily occur in various equivalent modifications or replace in the technical scope that the application discloses
Change, these modifications or substitutions should all cover within the protection domain of the application.Therefore, the protection domain of the application should be with right
It is required that protection domain be defined.
Claims (10)
- A kind of 1. display system, it is characterised in that including：Display device, there is an at least illuminating source；AndCurrent controller, an at least illuminating source described in connection, the current controller include：Sensing environment light device, sense the ambient brightness in front of the display device；Storage device, the sensing environment light device is connected, be configured as multiple numerals that storage corresponds to varying environment brightness respectively Reference value, wherein the predetermined drive currents of an at least illuminating source described in each Digital reference value is corresponding；Digital analog converter, it is connected to the storage device and to change the numeral ginseng of the ambient brightness in front of the display device Value is examined into the first electrical parameter；Comparator, it is connected to the digital analog converter and to first electrical parameter and the corresponding at least one luminous light Second electrical parameter of the operating driving current in source, and produce driving bias current；AndCurrent regulator, connect the comparator and according to it is described driving bias current adjustment described in an at least illuminating source work Make driving current, wherein the driving bias current corresponds to the difference between first electrical parameter and second electrical parameter.
- 2. display system as claimed in claim 1, it is characterised in that the comparator is voltage comparator；First electricity Parameter is at least voltage of the predetermined drive currents of an illuminating source described in corresponding；And second electrical parameter for described in corresponding extremely The feedback voltage of the operating driving current of a few illuminating source.
- 3. display system as claimed in claim 1, it is characterised in that the comparator is current comparator；First electricity Parameter is the current value of the correspondence at least predetermined drive currents of an illuminating source；And second electrical parameter is described in correspondence At least feedback current of the operating driving current of an illuminating source.
- 4. display system as claimed in claim 1, it is characterised in that the current controller also includes detector, the inspection Survey an at least illuminating source described in device connection and to measure second electrical parameter.
- 5. display system as claimed in claim 1, it is characterised in that at least predetermined drive currents of an illuminating source with Ambient brightness is directly proportional.
- A kind of 6. current driving method of display system, it is characterised in that including：The sensing environment light device of ambient brightness in front of the corresponding display device of sensing, and the ambient brightness is changed as digital reference Value, wherein the predetermined drive currents of the corresponding at least illuminating source of the Digital reference value；The Digital reference value is changed into the first electrical parameter；At least the second electrical parameter of the operating driving current of an illuminating source described in measurement is corresponding；Compare first electrical parameter and second electrical parameter, and driving bias current is produced according to comparative result；And according to The operating driving current of an at least illuminating source described in the driving bias current adjustment.
- 7. method as claimed in claim 6, it is characterised in that the predetermined drive currents and environment of an at least illuminating source Brightness is directly proportional.
- 8. method as claimed in claim 6, it is characterised in that first electrical parameter is an at least illuminating source described in correspondence Predetermined drive currents voltage；And second electrical parameter is at least operating driving current of an illuminating source described in corresponding Feedback voltage.
- 9. method as claimed in claim 6, it is characterised in that first electrical parameter is a correspondence at least illuminating source Predetermined drive currents current value；And the task driven electricity that second electrical parameter is an at least illuminating source described in one corresponding The feedback current of stream.
- A kind of 10. current driving method of display system, it is characterised in that including：The sensing environment light device of ambient brightness in front of the corresponding display device of sensing, and the ambient brightness is changed as digital reference Value, wherein the predetermined drive currents of the corresponding at least illuminating source of the Digital reference value；The Digital reference value is changed into the first electrical parameter；At least the second electrical parameter of the operating driving current of an illuminating source described in measurement is corresponding；Compare first electrical parameter and second electrical parameter, and driving bias current is produced according to comparative result；And according to The operating driving current of an at least illuminating source described in the driving bias current adjustment；The predetermined drive currents of an at least illuminating source are directly proportional to ambient brightness；The driving bias current corresponds to the difference of first electrical parameter and the second electrical parameter.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711016415.8A CN107808640A (en) | 2017-10-26 | 2017-10-26 | Display system and current driving method thereof |
| PCT/CN2017/116294 WO2019080306A1 (en) | 2017-10-26 | 2017-12-14 | Display system and current driving method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711016415.8A CN107808640A (en) | 2017-10-26 | 2017-10-26 | Display system and current driving method thereof |
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| Publication Number | Publication Date |
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| CN107808640A true CN107808640A (en) | 2018-03-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711016415.8A Pending CN107808640A (en) | 2017-10-26 | 2017-10-26 | Display system and current driving method thereof |
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| WO (1) | WO2019080306A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7057359B2 (en) * | 2003-10-28 | 2006-06-06 | Au Optronics Corporation | Method and apparatus for controlling driving current of illumination source in a display system |
| US7468722B2 (en) * | 2004-02-09 | 2008-12-23 | Microsemi Corporation | Method and apparatus to control display brightness with ambient light correction |
| KR100825411B1 (en) * | 2006-12-27 | 2008-04-29 | 한양대학교 산학협력단 | Ambient light sensor circuit and flat panel device having it |
| CN102242888A (en) * | 2010-05-12 | 2011-11-16 | 鸿富锦精密工业（深圳）有限公司 | Light-emitting device and method for adjusting light intensity of light-emitting device |
| CN202189539U (en) * | 2011-08-24 | 2012-04-11 | 周继军 | Adaptive adjustment LED (light-emitting diode) backlight circuit |
-
2017
- 2017-10-26 CN CN201711016415.8A patent/CN107808640A/en active Pending
- 2017-12-14 WO PCT/CN2017/116294 patent/WO2019080306A1/en active Application Filing
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Application publication date: 20180316 |