CN107705758A - Display system and current driving method - Google Patents

Display system and current driving method Download PDF

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Publication number
CN107705758A
CN107705758A CN201711015250.2A CN201711015250A CN107705758A CN 107705758 A CN107705758 A CN 107705758A CN 201711015250 A CN201711015250 A CN 201711015250A CN 107705758 A CN107705758 A CN 107705758A
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CN
China
Prior art keywords
illuminating source
current
electrical parameter
reference value
digital reference
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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
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CN201711015250.2A
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Chinese (zh)
Inventor
单剑锋
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HKC Co Ltd
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HKC Co Ltd
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Filing date
Publication date
Application filed by HKC Co Ltd filed Critical HKC Co Ltd
Priority to CN201711015250.2A priority Critical patent/CN107705758A/en
Priority to PCT/CN2017/116298 priority patent/WO2019080308A1/en
Publication of CN107705758A publication Critical patent/CN107705758A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source

Abstract

The embodiment of the present invention, which provides a kind of display system and current driving method, methods described, to be included：The first Digital reference value is changed into the first electrical parameter, wherein first Digital reference value corresponds to the predetermined drive currents of at least one illuminating source；The OPTICAL SENSORS of the brightness of the corresponding at least one illuminating source of sensing, and the brightness of at least one illuminating source is changed as the second Digital reference value, wherein second Digital reference value corresponds to the operating driving current of at least one illuminating source；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 the operating driving current of at least one illuminating source is adjusted according to the driving bias current.Therefore can according to corresponding to different use condition selections Digital reference value as the foundation for adjusting operating driving current.

Description

Display system and current driving method
Technical field
The present embodiments relate to display technology field, more particularly to a kind of display system and 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..For typical case, illuminating source is located in LCD components behind optical modulator, such as liquid crystal layer with profit In viewing 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
Technical problems to be solved of the embodiment of the present invention are to provide a kind of display system, can come according to different use conditions Control the operating driving current of internal illumination light source.
Technical problems to be solved of the embodiment of the present invention are to provide a kind of current driving method of display system, can foundation Different use conditions control the operating driving current of display system internal illumination light source.
In order to solve the above technical problems, the embodiment of the present invention provides a kind of display system first, including：
Display device, there is at least one illuminating source；And
Current controller, connects at least one illuminating source, and the current controller includes：
First storage device, multiple first Digital reference values that storage corresponds to different use conditions respectively are configured as, wherein often Individual first Digital reference value corresponds to the predetermined drive currents of at least one illuminating source；
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, sense the brightness of at least one illuminating source；
Second storage device, the OPTICAL SENSORS is connected, be configured as the second digital reference that storage corresponds to different brightness respectively Value, wherein second Digital reference value corresponds to the operating driving current of at least one illuminating source；
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 at least one illuminating source is adjusted according to the driving bias current Operating driving current, wherein the driving bias current corresponds to the difference between first electrical parameter and second electrical parameter Value.
Alternatively, the comparator is voltage comparator；First electrical parameter is corresponding at least one luminous light The voltage of the predetermined drive currents in source；And second electrical parameter is the task driven electricity of corresponding at least one illuminating source The feedback voltage of stream.
Alternatively, the comparator is current detector；First electrical parameter is at least one luminous light of the correspondence The current value of the predetermined drive currents in source；And second electrical parameter is the task driven of corresponding at least one illuminating source The feedback current of electric current.
Alternatively, the current controller also includes detector, and the detector connects at least one illuminating source And to measure second electrical parameter.
Wherein, the operating driving current of at least one illuminating source is directly proportional to brightness.
On the other hand, the embodiment of the present invention also provides 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 at least one illuminating source Predetermined drive currents；
The OPTICAL SENSORS of the brightness of the corresponding at least one illuminating source of sensing, and change at least one illuminating source Brightness is the second Digital reference value, wherein second Digital reference value corresponds to the task driven electricity of at least one illuminating source Stream；
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 The driving bias current adjusts the operating driving current of at least one illuminating source.
Alternatively, the operating driving current of at least one illuminating source is directly proportional to brightness.
Alternatively, first electrical parameter is the voltage of the predetermined drive currents of corresponding at least one illuminating source； And second electrical parameter is the feedback voltage of the operating driving current of corresponding at least one illuminating source.
Alternatively, first electrical parameter is the electric current of the predetermined drive currents of at least one illuminating source of the correspondence Value；And second electrical parameter is the feedback current of the operating driving current of corresponding at least one illuminating source.
Another aspect, the embodiment of the present invention also 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 at least one illuminating source Predetermined drive currents；
The OPTICAL SENSORS of the brightness of the corresponding at least one illuminating source of sensing, and change at least one illuminating source Brightness is the second Digital reference value, wherein second Digital reference value corresponds to the task driven electricity of at least one illuminating source Stream；
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 The driving bias current adjusts the operating driving current of at least one illuminating source；
The operating driving current of wherein described at least one illuminating source is directly proportional to brightness；
The difference of wherein described corresponding first and second electrical parameter of driving bias current.
Another aspect, the embodiment of the present invention additionally provide a kind of display system, including：
Display device, there is at least one illuminating source；And
Current controller, connects at least one illuminating source, and the current controller includes：
Timer, calculate total lighting time of at least one illuminating source；
Storage device, the timer is connected, be configured as multiple digital references that storage corresponds to different total lighting times respectively Value, wherein each Digital reference value corresponds to the predetermined drive currents of at least one illuminating source；
Digital analog converter, it is connected to the storage device and to change total lighting time of at least one illuminating source Digital reference value is into the first electrical parameter；
Comparator, be connected to the digital analog converter and to first electrical parameter with it is corresponding described at least one luminous Second electrical parameter of the operating driving current of light source, and produce driving bias current；And
Current regulator, connect the comparator and at least one illuminating source is adjusted according to the driving bias current Operating driving current, wherein the driving bias current corresponds to the difference between first electrical parameter and second electrical parameter Value.
Another aspect, the embodiment of the present invention also provide a kind of current driving method of display system, including：
The timer of total lighting time of corresponding at least one illuminating source is calculated, and changes at least one luminous light Total lighting time in source is Digital reference value, wherein the Digital reference value corresponds to the predetermined driving electricity of at least one illuminating source Stream；
The Digital reference value is changed into the first electrical parameter；
Second electrical parameter of the operating driving current of the corresponding at least one illuminating source of measurement；
Compare first electrical parameter and second electrical parameter, and driving bias current is produced according to comparative result；And according to The driving bias current adjusts the operating driving current of at least one illuminating source.
Another aspect, the embodiment of the present invention also provide a kind of display system, including：
Display device, there is at least one illuminating source；And
Current controller, connects at least one illuminating source, and the current controller includes：
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 each Digital reference value corresponds to the predetermined drive currents of at least one illuminating source；
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, be connected to the digital analog converter and to first electrical parameter with it is corresponding described at least one luminous Second electrical parameter of the operating driving current of light source, and produce driving bias current；And
Current regulator, connect the comparator and at least one illuminating source is adjusted according to the driving bias current Operating driving current, wherein the driving bias current corresponds to the difference between first electrical parameter and second electrical parameter Value.
Another aspect, the embodiment of the present invention also 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 Digital reference value corresponds to the predetermined drive currents of at least one illuminating source；
The Digital reference value is changed into the first electrical parameter；
Second electrical parameter of the operating driving current of the corresponding at least one illuminating source of measurement；
Compare first electrical parameter and second electrical parameter, and driving bias current is produced according to comparative result；And according to The driving bias current adjusts the operating driving current of at least one illuminating source.
Another aspect, the embodiment of the present invention also provide a kind of display system, including：
Display device, there is at least one illuminating source；And
Current controller, connects at least one illuminating source, and the current controller includes：
Operating temperature sensor, sense the operating temperature of at least one illuminating source；
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 each Digital reference value corresponds to the predetermined drive currents of at least one illuminating source；
Digital analog converter, it is connected to the storage device and to change the number of the operating temperature of at least one illuminating source Word reference value is into the first electrical parameter；
Comparator, be connected to the digital analog converter and to first electrical parameter with it is corresponding described at least one luminous Second electrical parameter of the operating driving current of light source, and produce driving bias current；And
Current regulator, connect the comparator and at least one illuminating source is adjusted according to the driving bias current Operating driving current, wherein the driving bias current corresponds to the difference between first electrical parameter and second electrical parameter Value.
Another aspect, the embodiment of the present invention also provide a kind of current driving method of display system, including：
The operating temperature sensor of the operating temperature of corresponding at least one illuminating source is calculated, and changes the operating temperature For Digital reference value, wherein the Digital reference value corresponds to the predetermined drive currents of at least one illuminating source；
The Digital reference value is changed into the first electrical parameter；The operating driving current of the corresponding at least one illuminating source of measurement 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 The driving bias current adjusts the operating driving current of at least one illuminating source.
Another aspect, the embodiment of the present invention also provide a kind of display system, including：
Display device, there is at least one illuminating source；And
Current controller, connects at least one illuminating source, and the current controller includes：
Sensing environment light device, sense the ambient brightness in front of the display device；
Operating temperature sensor, sense the operating temperature of at least one illuminating source；
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 corresponds at least one hair The predetermined drive currents of radiant；
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, be connected to the digital analog converter and to first electrical parameter with it is corresponding described at least one luminous Second electrical parameter of the operating driving current of light source, and produce driving bias current；And
Current regulator, connect the comparator and at least one illuminating source is adjusted according to the driving bias current Operating driving current, wherein the driving bias current corresponds to the difference between first electrical parameter and second electrical parameter Value.
By using above-mentioned technical proposal, the embodiment of the present invention at least has the advantages that：The embodiment of the present invention is led to Cross storage device and be pre-stored multiple Digital reference values, allow each Digital reference value to correspond to different use conditions respectively, whereby according to According to foundation of the Digital reference value as adjustment operating driving current corresponding to different use condition selections.In addition, the present invention Second electrical parameter, also can be by setting OPTICAL SENSORS in addition to can be by direct measurement tasks driving current, and directly sensing is bright Spend to obtain corresponding operating driving current, to avoid under same current caused by total lighting time or different operating temperature Jump in brightness.
Brief description of the drawings
Fig. 1 is a kind of schematic diagram of current regulator for illuminating source.
Fig. 2 provides illuminating source adjustment operating driving current to be a kind of in one embodiment of the invention using voltage comparator Controller schematic diagram.
Fig. 3 provides illuminating source adjustment operating driving current to be a kind of in one embodiment of the invention using current comparator Controller schematic diagram.
Fig. 4 is the step flow chart of the operating driving current that adjustment flows through illuminating source in one embodiment of the invention.
Fig. 5 provides illuminating source adjustment task driven electricity to be a kind of in another embodiment of the present invention using voltage comparator The schematic diagram of the controller of stream.
Fig. 6 provides illuminating source adjustment task driven electricity to be a kind of in another embodiment of the present invention using current comparator The schematic diagram of the controller of stream.
Fig. 7 is the step flow chart of the operating driving current that adjustment flows through illuminating source in another embodiment of the present invention.
Fig. 8 provides illuminating source adjustment task driven electricity to be a kind of in another embodiment of the present invention using voltage comparator The schematic diagram of the controller of stream.
Fig. 9 provides illuminating source adjustment task driven electricity to be a kind of in another embodiment of the present invention using current comparator The schematic diagram of the controller of stream.
Figure 10 is the step flow chart of the operating driving current that adjustment flows through illuminating source in another embodiment of the present invention.
Figure 11 provides illuminating source adjustment task driven to be a kind of in another embodiment of the present invention using voltage comparator The schematic diagram of the controller of electric current.
Figure 12 provides illuminating source adjustment task driven to be a kind of in another embodiment of the present invention using current comparator The schematic diagram of the controller of electric current.
Figure 13 is the step flow chart of the operating driving current that adjustment flows through illuminating source in another embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation describes.Obviously, described embodiment is part of the embodiment of the present invention, rather than whole embodiments.Based on this hair Embodiment in bright, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made Example, belongs to the scope of protection of the invention.
Fig. 1 illustrates a kind of current regulator 100 for illuminating source 104.Illuminating source module 104 can be located at LCD Behind optical modulator in component.Illuminating source module 104 includes the light emitting diode of series connection（LED).LED current control synthesis Circuit（Also known as controller）The driving current of 102 control illuminating source modules 104.The output end DRV of controller 102 is via RC Wave filter 106 is connected to the base stage of transistor 108.The colelctor electrode of transistor 108 is connected to power supply through connector load resistance 110 Device Vcc.The emitter grounding of transistor 108.The colelctor electrode of transistor 108 is further connected to illuminating source through diode 112 Module 104.The output end of illuminating source module 104 is grounded through biasing resistor 114.The output end of illuminating source module 104 also connects It is connected 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.Especially, once the resistance value of bias resistor 114 is established, then Driving current by illuminating source module 104 can not adjust.The LED luminance of illuminating source module 104 is with flowing through luminous light The driving current of source module 104 is directly proportional.Long-term use of circuit unit may cause the driving current of illuminating source module 104 not Expected change.In addition, the driving current in some species LED, such as organic LED (OLED) may be because current regulator 100 operation temperature changes and changed.As a result, the brightness of LED in illuminating source module 104 may be unfavorable for.Therefore, need Want a kind of method and device for controlling the driving current of illuminating source module in LCD system.
Fig. 2 provides illuminating source adjustment operating driving current to be a kind of in one embodiment of the invention using voltage comparator The schematic diagram of controller, as shown in Fig. 2 display system, including：Display device and current controller 260, display device can be liquid Crystal device, it has at least one illuminating source 214, and at least one illuminating source 214 may include several series winding LED (1)-(n) of 242 (1)-(n), LED 242 can be connected in series, and be connected in parallel, or series winding is connected with parallel combination mode, is sent out Radiant 214 can include the back light for LCD system, such as the LED backlight light source for small LCD systems, the LED back ofs the body Radiant can include various LED, such as white light LEDs, color LED and organic LED (OLED) etc..In addition, current control Device 260, at least one illuminating source 214 is connected, and current controller 260 includes：Timer 221, storage device 220, digital-to-analogue Converter 222, comparator 235 and current regulator 212.Timer 221 calculates when always lighting of at least one illuminating source 214 Between, 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, wherein each numeral The predetermined drive currents of the corresponding at least one illuminating source 214 of reference value 226, 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 Digital reference value using Analog to Digital Converter and store In storage device 220, due to can luminescence component can have the phenomenon of light decay according to total lighting time, that is, total lighting time It is different that 100 hours send brightness from the illuminating source of total 5000 hours lighting times under identical operating driving current, is led to Often the brightness of total 5000 hours lighting times can be less than the brightness of total 100 hours lighting times.Therefore, can be by illuminating source 214 Predetermined drive currents be set to it is directly proportional to total lighting time of illuminating source 214, that is to say, that illuminating source 214 it is total Lighting time is more long, then predetermined drive currents are bigger, and light decay phenomenon is compensated to increase operating driving current.Digital analog converter 222, it is connected to storage device 220 and to change the Digital reference value 226 of total lighting time of at least one 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 of at least one illuminating source 214 is adjusted according to driving bias current, In the present embodiment, current regulator 212 includes metal-oxide semiconductor (MOS)（MOS) transistor 240, MOS transistor 240 is adjusting Haircut the operating driving current of radiant 214, the gate terminal of MOS transistor 240 is connected with voltage comparator 235, and is received Drive signal DRV, and the source terminal of MOS transistor 240 is grounded, the drain electrode end of MOS transistors 240 further connects through diode D Sending and receiving radiant 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.
Fig. 3 provides illuminating source adjustment operating driving current to be a kind of in one embodiment of the invention using current comparator The schematic diagram of controller, as shown in figure 3, display system, including：Display device and current controller 260, display device can be liquid Crystal device, it has at least one illuminating source 214, and at least one illuminating source 214 may include several series winding LED (1)-(n) of 242 (1)-(n), LED 242 can be connected in series, and be connected in parallel, or series winding is connected with parallel combination mode, is sent out Radiant 214 can include the back light for LCD system, such as the LED backlight light source for small LCD systems, the LED back ofs the body Radiant can include various LED, such as white light LEDs, color LED and organic LED (OLED) etc..In addition, current control Device 260, at least one illuminating source 214 is connected, and current controller 260 includes：Timer 221, storage device 220, digital-to-analogue Converter 222, comparator 235 and current regulator 212.Timer 221 calculates when always lighting of at least one illuminating source 214 Between, 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, wherein each numeral The predetermined drive currents of the corresponding at least one illuminating source 214 of reference value 226, 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 Digital reference value using Analog to Digital Converter and store In storage device 220, due to can luminescence component can have the phenomenon of light decay according to total lighting time, that is, total lighting time It is different that 100 hours send brightness from the illuminating source of total 5000 hours lighting times under identical operating driving current, is led to Often the brightness of total 5000 hours lighting times can be less than the brightness of total 100 hours lighting times.Therefore, can be by illuminating source 214 Predetermined drive currents be set to it is directly proportional to total lighting time of illuminating source 214, that is to say, that illuminating source 214 it is total Lighting time is more long, then predetermined drive currents are bigger, and light decay phenomenon is compensated to increase operating driving current.Digital analog converter 222, it is connected to storage device 220 and to change the Digital reference value 226 of total lighting time of at least one 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 of at least one illuminating source 214 is adjusted according to driving bias current, In the present embodiment, current regulator 212 includes metal-oxide semiconductor (MOS)（MOS) transistor 240, MOS transistor 240 is adjusting Haircut the operating driving current of radiant 214, the gate terminal of MOS transistor 240 is connected with current comparator 237, and is received Drive signal DRV, and the source terminal of MOS transistor 240 is grounded, the drain electrode end of MOS transistors 240 further connects through diode D Sending and receiving radiant 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 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, Total lighting time of illuminating source 214 be 5000 hours, then predetermined drive currents be 5A, the first electrical parameter (reference current value) be 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 electric current with Difference between reference current value produces great drive signal DRV, causes the operating driving current of illuminating source 214 Increase, similarly, if the operating driving current for flowing through illuminating source 214 is excessive, current comparator 237 produces quite weak drive Dynamic 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.
Fig. 4 is the step flow chart for the operating driving current that adjustment flows through illuminating source, as shown in figure 4, in the present embodiment, Each step is performed with particular order, if however, when being performed with proper circuit, above-mentioned steps can be held with the unlimited particular order OK, it can carry out or carry out successively simultaneously in any order.
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, if during indifference, terminate；
Step 460, driving bias current is produced according to comparative result, to adjust the operating driving current of illuminating source, and repeated Step 430 is performed to 450.
Fig. 5 provides illuminating source adjustment operating driving current to be a kind of in another embodiment of the present invention using voltage comparator Controller schematic diagram, as shown in figure 5, display system, including：Display device and current controller 260, display device can be Liquid crystal display device, it has at least one illuminating source 214, and at least one illuminating source 214 may include several series winding LED (1)-(n) of 242 (1)-(n), LED 242 can be connected in series, and be connected in parallel, or series winding is connected with parallel combination mode, is sent out Radiant 214 can include the back light for LCD system, such as the LED backlight light source for small LCD systems, the LED back ofs the body Radiant can include various LED, such as white light LEDs, color LED and organic LED (OLED) etc..In addition, current control Device 260, at least one illuminating source 214 is connected, and current controller 260 includes：Sensing environment light device 223, storage device 220th, digital analog converter 222, comparator 235 and current regulator 212.In front of the sensing display device of sensing environment light device 223 Ambient brightness.Storage device 220, JA(junction ambient) OPTICAL SENSORS 223, it is configured as storage and corresponds to the more of varying environment brightness respectively Individual Digital reference value 226, wherein the predetermined drive currents of the corresponding at least one illuminating source 214 of each Digital reference value 226, number Word reference value can as needed for emulation illuminating source 214 operating condition and obtain.If for example, brightness and the stream of illuminating source 214 Driving current through illuminating source 214 is directly proportional, then the preferred drive current value for corresponding to brightness needed for illuminating source 214 can be by Emulate the operating condition of brightness needed for illuminating source 214 and obtain, then preferred drive current value can utilize simulation to turn numeral Parallel operation is converted into Digital reference value and is stored in storage device 220, because human eye is higher in brighter environment needs Backlight, can just see the content in display device, and than dark environment, too high backlight can cause eyes uncomfortable Even injure, now then need relatively low back lighting.Digital reference 226 is to be carried out in various degree for different ambient brightness Operating driving current control.Therefore, the predetermined drive currents of illuminating source 214 can be set to ambient brightness into just Than, that is to say, that ambient brightness is brighter, then predetermined drive currents are bigger, with the back of the body for increasing operating driving current to produce higher Light.Digital analog converter 222, it is connected to storage device 220 and to change the digital reference of the ambient brightness in front of display device Value 226 into the first electrical parameter, such as：Digital reference value 226 is first converted into analog signal and transmitted by digital analog converter 222 Analog signal corresponds to the reference voltage signal of analog signal to produce to voltage reference unit 230, voltage reference unit 230 (the first electrical parameter), for explanation, voltage reference unit 230 is shown as independent unit, however, voltage reference unit 230 can be merged into digital analog converter 222, for example, digital analog converter 222 can be being converted into by Digital reference value 226 One electrical parameter.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) join with the second electricity of the operating driving current of corresponding illuminating source 214 Number is (such as：Feedback voltage level), and produce the drive signal DRV of corresponding two input voltage differences (such as：Drive bias current), and electricity Throttle regulator 212 connects comparator 235 and the task driven electricity of at least one illuminating source 214 is adjusted according to driving bias current Stream, in the present embodiment, current regulator 212 includes metal-oxide semiconductor (MOS)（MOS) transistor 240, MOS transistor 240 To adjust the operating driving current of illuminating source 214, the gate terminal of MOS transistor 240 is connected with voltage comparator 235, and And drive signal DRV is received, and the source terminal of MOS transistor 240 is grounded, the drain electrode end of MOS transistors 240 is further through two Pole pipe D connections illuminating source 214, diode D are also grounded through feed-through capacitor C, and diode D is protecting illuminating source 214 to keep away Exempt from the failure of controller 260, 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.
Fig. 6 provides illuminating source adjustment operating driving current to be a kind of in another embodiment of the present invention using current comparator Controller schematic diagram, referring to Fig. 6, display system, including：Display device and current controller 260, display device can be Liquid crystal display device, it has at least one illuminating source 214, and at least one illuminating source 214 may include several series winding LED (1)-(n) of 242 (1)-(n), LED 242 can be connected in series, and be connected in parallel, or series winding is connected with parallel combination mode, is sent out Radiant 214 can include the back light for LCD system, such as the LED backlight light source for small LCD systems, the LED back ofs the body Radiant can include various LED, such as white light LEDs, color LED and organic LED (OLED) etc..In addition, current control Device 260, at least one illuminating source 214 is connected, and current controller 260 includes：Sensing environment light device 223, storage device 220th, digital analog converter 222, comparator 235 and current regulator 212.In front of the sensing display device of sensing environment light device 223 Ambient brightness.Storage device 220, JA(junction ambient) OPTICAL SENSORS 223, it is configured as storage and corresponds to the more of varying environment brightness respectively Individual Digital reference value 226, wherein the predetermined drive currents of the corresponding at least one illuminating source 214 of each Digital reference value 226, number Word reference value can as needed for emulation illuminating source 214 operating condition and obtain.If for example, brightness and the stream of illuminating source 214 Driving current through illuminating source 214 is directly proportional, then the preferred drive current value for corresponding to brightness needed for illuminating source 214 can be by Emulate the operating condition of brightness needed for illuminating source 214 and obtain, then preferred drive current value can utilize simulation to turn numeral Parallel operation is converted into Digital reference value and is stored in storage device 220, because human eye is higher in brighter environment needs Backlight, can just see the content in display device, and than dark environment, too high backlight can cause eyes uncomfortable Even injure, now then need relatively low back lighting.Digital reference 226 is to be carried out in various degree for different ambient brightness Operating driving current control.Therefore, the predetermined drive currents of illuminating source 214 can be set to ambient brightness into just Than, that is to say, that ambient brightness is brighter, then predetermined drive currents are bigger, with the back of the body for increasing operating driving current to produce higher Light.Digital analog converter 222, it is connected to storage device 220 and to change the digital reference of the ambient brightness in front of display device Value 226 into the first electrical parameter, such as：Digital reference value 226 is first converted into analog signal and transmitted by digital analog converter 222 Analog signal corresponds to the reference current signal of analog signal to produce to current reference unit 232, current reference unit 232 (the first electrical parameter), for explanation, current reference unit 232 is shown as independent unit, however, current reference unit 232 can be merged into digital analog converter 222, for example, digital analog converter 222 can be being converted into by Digital reference value 226 One electrical parameter.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) join with the second electricity of the operating driving current of corresponding illuminating source 214 Number is (such as：Feedback current), and produce the drive signal DRV of corresponding two input current differences (such as：Drive bias current), and electricity Throttle regulator 212 connects comparator 235 and the task driven electricity of at least one illuminating source 214 is adjusted according to driving bias current Stream, in the present embodiment, current regulator 212 includes metal-oxide semiconductor (MOS)（MOS) transistor 240, MOS transistor 240 To adjust the operating driving current of illuminating source 214, the gate terminal of MOS transistor 240 is connected with current comparator 237, and And drive signal DRV is received, and the source terminal of MOS transistor 240 is grounded, the drain electrode end of MOS transistors 240 is further through two Pole pipe D connections illuminating source 214, diode D are also grounded through feed-through capacitor C, and diode D is protecting illuminating source 214 to keep away Exempt from the failure of controller 260, 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 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.
Fig. 7 is the step flow chart for the operating driving current that adjustment flows through illuminating source, as shown in fig. 7, in the present embodiment, Each step is performed with particular order, if however, when being performed with proper circuit, above-mentioned steps can be held with the unlimited particular order OK, it can carry out or carry out successively simultaneously in any order.
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, judge whether variant between measured the first electrical parameter and the second electrical parameter；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.
Fig. 8 provides illuminating source adjustment operating driving current to be a kind of in another embodiment of the present invention using voltage comparator Controller schematic diagram, as shown in figure 8, display system, including：Display device and current controller 260, display device can be Liquid crystal display device, it has at least one illuminating source 214, and at least one illuminating source 214 may include several series winding LED (1)-(n) of 242 (1)-(n), LED 242 can be connected in series, and be connected in parallel, or series winding is connected with parallel combination mode, is sent out Radiant 214 can include the back light for LCD system, such as the LED backlight light source for small LCD systems, the LED back ofs the body Radiant can include various LED, such as white light LEDs, color LED and organic LED (OLED) etc..In addition, current control Device 260, at least one illuminating source 214 is connected, and current controller 260 includes：Operating temperature sensor 224, storage device 220th, digital analog converter 222, comparator 235 and current regulator 212.Operating temperature sensor 224 senses illuminating source 214 Operating temperature.Storage device 220, connection operating temperature sensor 224, it is configured as storage and corresponds to different operating temperature respectively Multiple Digital reference values 226, wherein the predetermined drive currents of the corresponding at least one illuminating source 214 of each Digital reference value 226, Digital reference value can as needed for emulation illuminating source 214 operating condition and obtain.If for example, the brightness of illuminating source 214 with Flow through that the driving current of illuminating source 214 is directly proportional, then the preferred drive current value for corresponding to brightness needed for illuminating source 214 can be with The operating condition of brightness as needed for emulation illuminating source 214 and obtain, then preferred drive current value can utilize simulation to numeral Converter is converted into Digital reference value and is stored in storage device 220, due to illuminating source 214 at different temperature, With identical operating driving current illuminating source 214, different brightness is had, the operating temperature of illuminating source 214 is higher, has Brighter brightness, it is therefore desirable to reduce operating driving current.Digital reference 226 is to carry out different journeys for different operating temperatures The control of the operating driving current of degree.Therefore, the predetermined drive currents of illuminating source 214 can be set to operating temperature into anti- Than, that is to say, that operating temperature is higher, then predetermined drive currents are smaller, to reduce operating driving current.Digital analog converter 222, It is connected to storage device 220 and to change the Digital reference value 226 of the operating temperature of illuminating source 214 into the first electrical parameter, Such as：Digital reference value 226 is first converted into analog signal and transmits analog signal to Voltage Reference by digital analog converter 222 Unit 230, voltage reference unit 230 correspond to the reference voltage signal (the first electrical parameter) of analog signal to produce, in order to For the sake of explanation, voltage reference unit 230 is shown as independent unit, turns however, voltage reference unit 230 can be merged into digital-to-analogue Parallel operation 222, for example, digital analog converter 222 can be being converted into the first electrical parameter by Digital reference value 226.Comparator 235 is Voltage comparator 235, 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 regulator 212 connection compare Device 235 and the operating driving current that at least one illuminating source 214 is adjusted according to driving bias current, in the present embodiment, electricity Throttle regulator 212 includes metal-oxide semiconductor (MOS)（MOS) transistor 240, MOS transistor 240 is adjusting illuminating source 214 Operating driving current, the gate terminal of MOS transistor 240 is connected with voltage comparator 235, and receives drive signal DRV, and The source terminal ground connection of MOS transistor 240, the drain electrode ends of MOS transistors 240 further through diode D connections illuminating source 214, Diode D is also grounded through feed-through capacitor C, diode D protecting illuminating source 214 to avoid the failure of controller 260, and to Undesired high-frequency current drainage is grounded 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 operating temperature of illuminating source 214 in current controller 260, The Digital reference value 226 according to corresponding to automatically selecting operating temperature of current controller 260, and operating driving current is adjusted according to this.
Fig. 9 provides illuminating source adjustment operating driving current to be a kind of in another embodiment of the present invention using current comparator Controller schematic diagram, as shown in figure 9, display system, including：Display device and current controller 260, display device can be Liquid crystal display device, it has at least one illuminating source 214, and at least one illuminating source 214 may include several series winding LED (1)-(n) of 242 (1)-(n), LED 242 can be connected in series, and be connected in parallel, or series winding is connected with parallel combination mode, is sent out Radiant 214 can include the back light for LCD system, such as the LED backlight light source for small LCD systems, the LED back ofs the body Radiant can include various LED, such as white light LEDs, color LED and organic LED (OLED) etc..In addition, current control Device 260, at least one illuminating source 214 is connected, and current controller 260 includes：Operating temperature sensor 224, storage device 220th, digital analog converter 222, comparator 235 and current regulator 212.Operating temperature sensor 224 senses illuminating source 214 Operating temperature.Storage device 220, connection operating temperature sensor 224, it is configured as storage and corresponds to different operating temperature respectively Multiple Digital reference values 226, wherein the predetermined drive currents of the corresponding at least one illuminating source 214 of each Digital reference value 226, Digital reference value can as needed for emulation illuminating source 214 operating condition and obtain.If for example, the brightness of illuminating source 214 with Flow through that the driving current of illuminating source 214 is directly proportional, then the preferred drive current value for corresponding to brightness needed for illuminating source 214 can be with The operating condition of brightness as needed for emulation illuminating source 214 and obtain, then preferred drive current value can utilize simulation to numeral Converter is converted into Digital reference value and is stored in storage device 220, due to illuminating source 214 at different temperature, With identical operating driving current illuminating source 214, different brightness is had, the operating temperature of illuminating source 214 is higher, has Brighter brightness, it is therefore desirable to reduce operating driving current.Digital reference 226 is to carry out different journeys for different operating temperatures The control of the operating driving current of degree.Therefore, the predetermined drive currents of illuminating source 214 can be set to operating temperature into anti- Than, that is to say, that operating temperature is higher, then predetermined drive currents are smaller, to reduce operating driving current.Digital analog converter 222, It is connected to storage device 220 and to change the Digital reference value 226 of the operating temperature of illuminating source 214 into the first electrical parameter, Such as：Digital reference value 226 is first converted into analog signal and transmits analog signal to current reference by digital analog converter 222 Unit 232, current reference unit 232 correspond to the reference current signal (the first electrical parameter) of analog signal to produce, in order to For the sake of explanation, current reference unit 232 is shown as independent unit, turns however, current reference unit 232 can be merged into digital-to-analogue Parallel operation 222, for example, digital analog converter 222 can be being converted into the first electrical parameter by Digital reference value 226.Comparator 237 is Current comparator 237, 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 regulator 212 connection compare Device 235 and the operating driving current that at least one illuminating source 214 is adjusted according to driving bias current, in the present embodiment, electricity Throttle regulator 212 includes metal-oxide semiconductor (MOS)（MOS) transistor 240, MOS transistor 240 is adjusting illuminating source 214 Operating driving current, the gate terminal of MOS transistor 240 is connected with current comparator 237, and receives drive signal DRV, and The source terminal ground connection of MOS transistor 240, the drain electrode ends of MOS transistors 240 further through diode D connections illuminating source 214, Diode D is also grounded through feed-through capacitor C, diode D protecting illuminating source 214 to avoid the failure of controller 260, and to Undesired high-frequency current drainage is grounded 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 one illuminating source 214, Digital reference value can operate needed for emulation illuminating source 214 Condition and obtain.Therefore, current controller 260 can automatically select corresponding Digital reference value according to ambient brightness and operating temperature 226, and operating driving current is adjusted according to this.
Figure 10 is the step flow chart for the operating driving current that adjustment flows through illuminating source, as shown in Figure 10, the present embodiment In, each step is performed with particular order, if however, when being performed with proper circuit, above-mentioned steps can be with the unlimited particular order Perform, can carry out or carry out successively simultaneously in any order.
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, judge whether variant between measured the first electrical parameter and the second electrical parameter.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.
Figure 11 provides illuminating source adjustment task driven electricity to be a kind of in another embodiment of the present invention using voltage comparator The schematic diagram of the controller of stream, as shown in figure 11, display system, including：Display device and current controller 260, display device Can be liquid crystal display device, it has at least one illuminating source 214, and at least one illuminating source 214 may include several strings Even (1)-(n) of LED 242 (1)-(n), LED 242 can be connected in series, and be connected in parallel, or series winding connects with parallel combination mode Connecing, illuminating source 214 can include the back light for LCD system, such as the LED backlight light source for small LCD systems, LED backlight light source can include various LED, such as white light LEDs, color LED and organic LED (OLED) etc..In addition, electric current Controller 260, at least one illuminating source 214 is connected, and current controller 260 includes：The storage dress of use condition 225, first Put the 220, first digital analog converter 222, the second storage device 253, the second digital analog converter 254, comparator 235, OPTICAL SENSORS 251 and current regulator 212.Use condition 225 can include the sensing operating temperature of illuminating source 214, illuminating source 214 Ambient brightness in front of total lighting time, display device.First storage device 220, use condition 225 is connected, is configured as depositing Storage corresponds to multiple first Digital reference values 226 of different use conditions 225 respectively, wherein each first Digital reference value 226 is right The predetermined drive currents of at least one illuminating source 214 are answered, the first Digital reference value 226 can be by the institute of emulation illuminating source 214 Need operating condition and obtain.For example, if the brightness of illuminating source 214 is directly proportional to the driving current for flowing through illuminating source 214, The preferred drive current value of brightness needed for corresponding illuminating source 214 can as needed for emulation illuminating source 214 brightness operation bar Part and obtain, then preferred drive current value can be converted into the first Digital reference value and be stored using Analog to Digital Converter In first storage device 220, because under different use conditions 225, illuminating source 214 has different brightness, work is driven The demands such as streaming current, it is therefore desirable to adjust the operating driving current of illuminating source 214.First digital reference 226 is i.e. for difference Use condition 225 carry out the control of different degrees of operating driving current.First digital analog converter 222, it is connected to first and deposits 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 reference value 226 is first converted into analog signal and transmits analog signal to the first electricity by the first digital analog converter 222 Reference unit 230 is pressed, first voltage reference unit 230 corresponds to reference voltage signal (the first electricity of analog signal to produce Parameter), for explanation, first voltage reference unit 230 is shown as independent unit, however, first voltage reference unit 230 can be merged into the first digital analog converter 222, for example, the first digital analog converter 222 can be to by the first Digital reference value 226 are converted into the first electrical parameter.In addition, identical, OPTICAL SENSORS 251 can sense the brightness of illuminating source 214.Second storage Device 252, OPTICAL SENSORS 251 is connected, be configured as multiple second numbers that storage corresponds to the brightness of different illuminating sources 214 respectively Word reference value 253, wherein the operating driving current of the corresponding at least one 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 255 is pressed, second voltage reference unit 255 corresponds to the second electrical parameter of analog signal to produce, in order to illustrate For the sake of, second voltage reference unit 255 is shown as independent unit, however, second voltage reference unit 255 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 235 is voltage comparator 235, and the first digital analog converter is electrically connected at by first voltage reference unit 230 222 and the second digital analog converter 254 is electrically connected at by second voltage reference unit 255, and to compare the first electrical parameter (such as：Reference voltage level) and the second electrical parameter is (such as：Feedback voltage level), and produce the drive signal of corresponding two input voltage 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 individual 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 grid of MOS transistor 240 Extremely it is connected with voltage comparator 235, and receives drive signal DRV, and the source terminal of MOS transistor 240 is grounded, MOS is brilliant The drain electrode end of body pipe 240 is further also grounded through diode D connections illuminating source 214, diode D through feed-through capacitor C, two poles Pipe D is drained through bypass electricity to protect illuminating source 214 to avoid the failure of controller 260, and to undesired high-frequency current Container 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.
Figure 12 provides illuminating source adjustment task driven electricity to be a kind of in another embodiment of the present invention using current comparator The schematic diagram of the controller of stream, as shown in figure 12, display system, including：Display device and current controller 260, display device Can be liquid crystal display device, it has at least one illuminating source 214, and at least one illuminating source 214 may include several strings Even (1)-(n) of LED 242 (1)-(n), LED 242 can be connected in series, and be connected in parallel, or series winding connects with parallel combination mode Connecing, illuminating source 214 can include the back light for LCD system, such as the LED backlight light source for small LCD systems, LED backlight light source can include various LED, such as white light LEDs, color LED and organic LED (OLED) etc..In addition, electric current Controller 260, at least one illuminating source 214 is connected, and current controller 260 includes：The storage dress of use condition 225, first Put the 220, first digital analog converter 222, the second storage device 253, the second digital analog converter 254, comparator 235, OPTICAL SENSORS 251 and current regulator 212.Use condition 225 can include the sensing operating temperature of illuminating source 214, illuminating source 214 Ambient brightness in front of total lighting time, display device.First storage device 220, use condition 225 is connected, is configured as depositing Storage corresponds to different multiple first Digital reference values 226 with condition 225 respectively, wherein each correspondence of first Digital reference value 226 The predetermined drive currents of at least one illuminating source 214, the first Digital reference value can operate needed for emulation illuminating source 214 Condition and obtain.For example, if the brightness of illuminating source 214 is directly proportional to the driving current for flowing through illuminating source 214, hair is corresponded to The preferred drive current value of brightness needed for radiant 214 can as needed for emulation illuminating source 214 operating condition of brightness and obtain, Then preferred drive current value can be converted into the first Digital reference value using Analog to Digital Converter and be stored in first In storage device 220, because under different use conditions 225, illuminating source 214 has different brightness, operating driving current Etc. demand, it is therefore desirable to adjust the operating driving current of illuminating source 214.First digital reference 226 is directed to different uses Condition 225 carries out the control of different degrees of operating driving current.First digital analog converter 222, is connected to first 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 number First Digital reference value 226 is first converted into analog signal and transmits analog signal to join to the first electric current by weighted-voltage D/A converter 222 Unit 232 is examined, the first current reference unit 232 corresponds to reference current signal (the first electricity ginseng of analog signal to produce Number), for explanation, the first current reference unit 232 is shown as independent unit, however, the first current reference unit 232 The first digital analog converter 222 can be merged into, for example, the first digital analog converter 222 can be Digital reference value 226 to be changed Into the first electrical parameter.In addition, identical, OPTICAL SENSORS 251 can sense the brightness of illuminating source 214.Second storage device 252, OPTICAL SENSORS 251 is connected, is configured as multiple second numeral ginsengs that storage corresponds to the brightness of different illuminating sources 214 respectively Value 253 is examined, wherein the operating driving current of the corresponding at least one illuminating source 214 of each second Digital reference value 253, the second number Word reference value 253 can as needed for emulation illuminating source 214 operating condition and obtain.If for example, the brightness of illuminating source 214 with Flow through that the operating driving current of illuminating source 214 is directly proportional, then the operating driving current value for corresponding to the brightness of illuminating source 214 can Obtained with the operating condition by emulation illuminating source 214, then operating driving current value can utilize Analog to Digital Converter It 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 second and deposits Storage device 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 Second Digital reference value 253 is first converted into analog signal and transmits analog signal to join to the second electric current by digital analog converter 222 Unit 256 is examined, the second current reference unit 256 corresponds to the second electrical parameter of analog signal to produce, for explanation, Second voltage reference unit 256 is shown as independent unit, however, second voltage reference unit 256 can be merged into the second number Weighted-voltage D/A converter 254, for example, the second digital analog converter 254 can join the second Digital reference value 253 is converted into the second electricity Number.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 individual 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 grid of MOS transistor 240 Extremely it is connected with current comparator 237, and receives drive signal DRV, and the source terminal of MOS transistor 240 is grounded, MOS is brilliant The drain electrode end of body pipe 240 is further also grounded through diode D connections illuminating source 214, diode D through feed-through capacitor C, two poles Pipe D is drained through bypass electricity to protect illuminating source 214 to avoid the failure of controller 260, and to undesired high-frequency current Container 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 great drive signal DRV, makes Into the operating driving current increase of illuminating source 214, to produce higher backlight, similarly, if the brightness of illuminating source 214 Cross bright, corresponding operating driving current is excessive, then current comparator 237 produces quite weak drive signal DRV, reduces luminous light The operating driving current in 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.
Figure 13 is the step flow chart for the operating driving current that adjustment flows through illuminating source, refers to Figure 13, the present embodiment In, each step is performed with particular order, if however, when being performed with proper circuit, above-mentioned steps can be with the unlimited particular order Perform, can carry out or carry out successively simultaneously in any order.
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 present invention is provided according to different use conditions to control the work of illuminating source in liquid crystal display systems The method and device of driving current.In addition, in addition to the present invention measures the operating driving current of illuminating source 214 except that can adopt, also The operating driving current of illuminating source 214 can not be measured, but OPTICAL SENSORS 251 is set, it is corresponding directly to sense brightness acquirement Operating driving current, to avoid under same current the jump in brightness caused by total lighting time or different operating temperature, lead to Cross operating driving current corresponding to the acquirement of sensing brightness 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.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any Those familiar with the art the invention discloses technical scope in, various equivalent modifications can be readily occurred in or replaced Change, these modifications or substitutions should be all included within the scope of the present invention.Therefore, protection scope of the present invention 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 at least one illuminating source；And
    Current controller, connects at least one illuminating source, and the current controller includes：
    First storage device, multiple first Digital reference values that storage corresponds to different use conditions respectively are configured as, wherein often Individual first Digital reference value corresponds to the predetermined drive currents of at least one illuminating source；
    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, sense the brightness of at least one illuminating source；
    Second storage device, the OPTICAL SENSORS is connected, be configured as the second digital reference that storage corresponds to different brightness respectively Value, wherein second Digital reference value corresponds to the operating driving current of at least one illuminating source；
    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 at least one illuminating source is adjusted according to the driving bias current Operating driving current, wherein the driving bias current corresponds to the difference between first electrical parameter and second electrical parameter Value.
  2. 2. display system as claimed in claim 1, it is characterised in that the comparator is voltage comparator；First electricity Parameter is the voltage of the predetermined drive currents of corresponding at least one illuminating source；And second electrical parameter is described in correspondence The feedback voltage of the operating driving current of at least one illuminating source.
  3. 3. display system as claimed in claim 1, it is characterised in that the comparator is current detector；First electricity Parameter is the current value of the predetermined drive currents of at least one illuminating source of the correspondence；And second electrical parameter is corresponding institute State the feedback current of the operating driving current of at least one 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 device and connect at least one illuminating source and to measure second electrical parameter.
  5. 5. display system as claimed in claim 1, it is characterised in that the operating driving current of at least one illuminating source It is directly proportional to brightness.
  6. A kind of 6. current driving method of display system, it is characterised in that including：
    The first Digital reference value is changed into the first electrical parameter, wherein first Digital reference value corresponds at least one illuminating source Predetermined drive currents；
    The OPTICAL SENSORS of the brightness of the corresponding at least one illuminating source of sensing, and change at least one illuminating source Brightness is the second Digital reference value, wherein second Digital reference value corresponds to the task driven electricity of at least one illuminating source Stream；
    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 The driving bias current adjusts the operating driving current of at least one illuminating source.
  7. 7. method as claimed in claim 6, it is characterised in that the operating driving current of at least one illuminating source with it is bright Spend directly proportional.
  8. 8. method as claimed in claim 6, it is characterised in that first electrical parameter is corresponding at least one luminous light The voltage of the predetermined drive currents in source；And second electrical parameter is the task driven electricity of corresponding at least one illuminating source The feedback voltage of stream.
  9. 9. method as claimed in claim 6, it is characterised in that first electrical parameter is at least one luminous light of the correspondence The current value of the predetermined drive currents in source；And second electrical parameter is the task driven of corresponding at least one illuminating source The feedback current of electric current.
  10. A kind of 10. current driving method of display system, it is characterised in that including：
    The first Digital reference value is changed into the first electrical parameter, wherein first Digital reference value corresponds at least one illuminating source Predetermined drive currents；
    The OPTICAL SENSORS of the brightness of the corresponding at least one illuminating source of sensing, and change at least one illuminating source Brightness is the second Digital reference value, wherein second Digital reference value corresponds to the task driven electricity of at least one illuminating source Stream；
    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 The driving bias current adjusts the operating driving current of at least one illuminating source；
    Wherein, the operating driving current of at least one illuminating source is directly proportional to brightness；
    Wherein, the driving bias current corresponds to the difference of first electrical parameter and the second electrical parameter.
CN201711015250.2A 2017-10-26 2017-10-26 Display system and current driving method Pending CN107705758A (en)

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