CN107731173A - Display system and its current driving method - Google Patents

Display system and its current driving method Download PDF

Info

Publication number
CN107731173A
CN107731173A CN201711015295.XA CN201711015295A CN107731173A CN 107731173 A CN107731173 A CN 107731173A CN 201711015295 A CN201711015295 A CN 201711015295A CN 107731173 A CN107731173 A CN 107731173A
Authority
CN
China
Prior art keywords
current
illuminating source
electrical parameter
reference value
driving
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201711015295.XA
Other languages
Chinese (zh)
Inventor
单剑锋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HKC Co Ltd
Original Assignee
HKC Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by HKC Co Ltd filed Critical HKC Co Ltd
Priority to CN201711015295.XA priority Critical patent/CN107731173A/en
Priority to PCT/CN2017/116293 priority patent/WO2019080305A1/en
Publication of CN107731173A publication Critical patent/CN107731173A/en
Pending legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

The application, which provides a kind of display system and its current driving method, the display system, to be included：Display device and current controller, the current controller include：Timer, the storage device of connection timer, it is connected to storage device and to change the Digital reference value of total lighting time of an at least illuminating source into the digital analog converter of the first electrical parameter, it is connected to digital analog converter and to compare second electrical parameter of first electrical parameter with the corresponding at least operating driving current of an illuminating source, and produce the comparator and connection comparator and the current regulator according to the driving bias current adjustment at least operating driving current of an illuminating source of driving bias current, difference described in wherein described driving bias current between the first electrical parameter and second electrical parameter.According to the operating driving current of an at least illuminating source described in the driving bias current adjustment, so as to as foundation of the Digital reference value as adjustment operating driving current corresponding to different use condition selections.

Description

Display system and its current driving method
Technical field
The invention relates to display technology field, more particularly to a kind of display system and its current driving 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 to provide a kind of current driving method the embodiment of the present application, for showing System controls illuminating source.
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 one of total lighting time of an at least illuminating source Digital 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, at least predetermined drive currents of an illuminating source are directly proportional to total lighting time.
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.
Further, at least predetermined drive currents of an illuminating source are directly proportional to total lighting time.
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 corresponding.
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；
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.
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 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：
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 one 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.
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；
At least predetermined drive currents of an illuminating source are directly proportional to total lighting time；
The driving bias current corresponds to the difference of first electrical parameter and the second electrical parameter.
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 step 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 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 work temperature of illuminating source 214 Spend for 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 is only that 3A, the second electrical parameter (voltage FB) are 100V, then the difference between voltage FB and reference voltage level is Great drive signal DRV is produced, causing the operating driving current of illuminating source 214 increases, to produce higher brightness, 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, 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, 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 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)

  1. A kind of 1. display system, it is characterised in that 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：
    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 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.
  2. 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. 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. 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. 5. display system as claimed in claim 1, it is characterised in that at least predetermined drive currents of an illuminating source with Total lighting time is directly proportional.
  6. A kind of 6. current driving method of display system, it is characterised in that 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.
  7. 7. method as claimed in claim 6, it is characterised in that at least predetermined drive currents of an illuminating source and total point The bright time is directly proportional.
  8. 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. 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 second electrical parameter is the operating driving current of an at least illuminating source described in correspondence Feedback current.
  10. A kind of 10. current driving method of display system, it is characterised in that 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；
    At least predetermined drive currents of an illuminating source are directly proportional to total lighting time；
    The driving bias current corresponds to the difference of first electrical parameter and the second electrical parameter.
CN201711015295.XA 2017-10-26 2017-10-26 Display system and its current driving method Pending CN107731173A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201711015295.XA CN107731173A (en) 2017-10-26 2017-10-26 Display system and its current driving method
PCT/CN2017/116293 WO2019080305A1 (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
CN201711015295.XA CN107731173A (en) 2017-10-26 2017-10-26 Display system and its current driving method

Publications (1)

Publication Number Publication Date
CN107731173A true CN107731173A (en) 2018-02-23

Family

ID=61212855

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201711015295.XA Pending CN107731173A (en) 2017-10-26 2017-10-26 Display system and its current driving method

Country Status (2)

Country Link
CN (1) CN107731173A (en)
WO (1) WO2019080305A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109089360A (en) * 2018-08-23 2018-12-25 北京雪迪龙科技股份有限公司 A kind of mercury lamp intensity control circuit
CN109872668A (en) * 2019-04-12 2019-06-11 京东方科技集团股份有限公司 Image shows total current prediction technique, display device and storage medium
WO2020087605A1 (en) * 2018-10-30 2020-05-07 惠科股份有限公司 Delay adjustment circuit and method, and display device
WO2023231109A1 (en) * 2022-05-31 2023-12-07 广东奥普特科技股份有限公司 Quick switching circuit for brightness of light source

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1435811A (en) * 2002-02-01 2003-08-13 精工爱普生株式会社 Electro-optical device, driving method thereof and electronic apparatus
CN1591109A (en) * 2003-10-28 2005-03-09 友达光电股份有限公司 Method and apparatus for controlling driving current of light source in display system
US20060071900A1 (en) * 2004-10-05 2006-04-06 Research In Motion Limited Method for maintaining the white colour point in a field-sequential LCD over time
CN101663700A (en) * 2007-05-08 2010-03-03 索尼爱立信移动通讯有限公司 Controlling electroluminescent panels in response to cumulative utilization

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102467882B (en) * 2010-11-18 2015-01-21 康佳集团股份有限公司 Dimming system of light emitting diode (LED) backlight module, liquid crystal display and dimming method
JP5625864B2 (en) * 2010-12-15 2014-11-19 ソニー株式会社 Display device and driving method of display device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1435811A (en) * 2002-02-01 2003-08-13 精工爱普生株式会社 Electro-optical device, driving method thereof and electronic apparatus
CN1591109A (en) * 2003-10-28 2005-03-09 友达光电股份有限公司 Method and apparatus for controlling driving current of light source in display system
US20060071900A1 (en) * 2004-10-05 2006-04-06 Research In Motion Limited Method for maintaining the white colour point in a field-sequential LCD over time
CN101663700A (en) * 2007-05-08 2010-03-03 索尼爱立信移动通讯有限公司 Controlling electroluminescent panels in response to cumulative utilization

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109089360A (en) * 2018-08-23 2018-12-25 北京雪迪龙科技股份有限公司 A kind of mercury lamp intensity control circuit
WO2020087605A1 (en) * 2018-10-30 2020-05-07 惠科股份有限公司 Delay adjustment circuit and method, and display device
US11295654B2 (en) 2018-10-30 2022-04-05 HKC Corporation Limited Delay adjustment circuit and method, and display device
CN109872668A (en) * 2019-04-12 2019-06-11 京东方科技集团股份有限公司 Image shows total current prediction technique, display device and storage medium
WO2023231109A1 (en) * 2022-05-31 2023-12-07 广东奥普特科技股份有限公司 Quick switching circuit for brightness of light source

Also Published As

Publication number Publication date
WO2019080305A1 (en) 2019-05-02

Similar Documents

Publication Publication Date Title
US10103625B2 (en) Load driving device, and lighting apparatus and liquid crystal display device using the same
KR101539359B1 (en) Method for driving a light source, light source apparatus for performing the method, and display apparatus having the light source apparatus
CN100412622C (en) Method and apparatus for controlling driving current of light source in display system
KR102208396B1 (en) Power supplying apparatus and display apparatus including the same
US7888888B2 (en) Light source apparatus and driving apparatus thereof
CN107731173A (en) Display system and its current driving method
JP6254989B2 (en) BACKLIGHT DEVICE, ELECTRONIC DEVICE, BACKLIGHT DEVICE CONTROL METHOD, AND CURRENT REGULATOR
US8143792B2 (en) Light-emitting diode backlighting systems
KR100907300B1 (en) Drive Circuit For Light Emitting Diode
US9468065B2 (en) Combined hybrid and local dimming control of light emitting diodes
US20100141163A1 (en) Method of driving a light source, light source apparatus for performing the method and display apparatus having the light source apparatus
CN101169920B (en) Display apparatus and control method thereof
KR20080106234A (en) Voltage controlled led light driver
CN108648687B (en) Pixel correction and compensation driving circuit, and pixel correction and compensation method using same
US20150145424A1 (en) Lcd backlight driving circuit and liquid crystal device
CN211237683U (en) Backlight adjusting circuit and display device
CN107660016A (en) Lamp device and ligthing paraphernalia
US9288854B2 (en) Backlight unit and display device having the same
KR20090015609A (en) Led driving circuit
CN112820243B (en) Backlight control circuit, control method thereof and display terminal
US9136758B2 (en) Voltage converting LED circuit with switched capacitor network
KR101973501B1 (en) Driving circuit of light emitting diodes and method driving of thereof
CN107818764A (en) Display system and current driving method
CN108305588A (en) Display device
CN107808640A (en) Display system and its current driving method

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20180223