CN105575335A - Light-emitting device, electronic equipment and driving method - Google Patents
Light-emitting device, electronic equipment and driving method Download PDFInfo
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- CN105575335A CN105575335A CN201510961128.9A CN201510961128A CN105575335A CN 105575335 A CN105575335 A CN 105575335A CN 201510961128 A CN201510961128 A CN 201510961128A CN 105575335 A CN105575335 A CN 105575335A
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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
An embodiment of the invention discloses a light-emitting device, electronic equipment and driving method. The light-emitting device includes at least two driving sub-circuits and a white light diode, each of the driving sub-circuits can switch between a driving state and a non-driving state, and periods of time when any two of the driving sub-circuits are in the driving state in a driving period are staggered, and the white light diode is connected with the driving sub-circuits and emits light under driving of the driving sub-circuits.
Description
Technical field
The present invention relates to the simultaneous techniques of electronic device field, particularly relate to a kind of light-emitting device, electronic equipment and driving method.
Background technology
Display screen in electronic equipment is the passive display screens such as LCDs, usually can need to provide display light source by other structures.Such as, liquid crystal display generally needs backlight module to provide display light source.In the prior art as this display light source modules such as backlight modules, usually booster type power supply changeover device framework is all used, output one DC voltage of boosting after boost converter provides backlight module power supply to input, and go to drive the secretly bright of light-emitting component in display light source module against driver, reach the effect of backlight.Display light source module combines by organizing series-parallel light-emitting component (such as light emitting diode) more, driver control work period size.When the cycle is large, brightness is strong, when the work period reaches 100%, be the brightest pattern, otherwise 0% is the darkest pattern.Existing driver is all remove the several light-emitting component string of switch when controlling display light source module simultaneously, and this kind of type of drive needs more output capacitor and produce larger ripple current value.Ripple current can aggravate the aging of electronic component (such as capacity cell) and damage, and destroys the stability of electronic component.
Summary of the invention
In view of this, the embodiment of the present invention is expected to provide a kind of light-emitting device, electronic equipment and driving method, solves the problem at least partly.
For achieving the above object, technical scheme of the present invention is achieved in that
Embodiments provide a kind of light-emitting device, described light-emitting device comprises:
At least two-way drive sub-circuits; Wherein, described in each road, drive sub-circuits can switch between driving condition and non-driven state; And the time period that any two described drive sub-circuits are in driving condition in a drive cycle mutually stagger;
White light-emitting diodes, is connected with described drive sub-circuits, under the driving of described drive sub-circuits, carry out luminescence.
Based on such scheme, drive sub-circuits described in each road is provided with on-off element;
Described switching elements conductive, described drive sub-circuits is in described driving condition;
Described on-off element disconnects, and described drive sub-circuits is in the non-driven state beyond described driving condition.
Based on such scheme, described on-off element is driving power transistor.
Based on such scheme, described on-off element, described in concrete each road of control, drive sub-circuits is carried out once from described non-driven state to the switching of described driving condition in a described drive cycle.
Based on such scheme, described light-emitting device also comprises driving governor;
Described driving governor is connected with drive sub-circuits described in each road, for controlling according to the duration of driving work period the duration that described drive sub-circuits is in described driving condition in each described drive cycle.
Embodiment of the present invention second aspect provides a kind of electronic equipment, it is characterized in that,
Described electronic equipment comprises display module and light-emitting device as described in any one of claim 1 to 5;
Described light-emitting device is used for providing display light source for described display module.
The embodiment of the present invention third aspect provides a kind of driving method, and described method comprises:
Different driving electronic circuit is utilized to interlock for white light-emitting diodes provides driving at drive cycle;
Described white light-emitting diodes is luminous under the driving of described drive sub-circuits.
Based on such scheme, describedly utilize different driving electronic circuit interlocking for white light-emitting diodes provides driving at drive cycle, comprising:
Control to provide the drive sub-circuits of driving to switch driving condition from non-driven state for white light-emitting diodes;
The drive sub-circuits being in driving condition provides driving for described white light-emitting diodes.
Based on such scheme,
Described method also comprises:
According to described drive cycle, determine the duration maintaining described driving condition of drive sub-circuits described in each;
Based on described duration, control the switching of drive sub-circuits between described driving condition and described non-driven state described in each road.
Based on such scheme, described method also comprises:
The luminescence of described white light-emitting diodes is utilized to provide display light source for showing module.
The light-emitting device that the embodiment of the present invention provides, electronic equipment and driving method, at least two-way drive sub-circuits is utilized to interlock for white light-emitting diodes provides driving, like this, can solve and provide driving relative to each road drive sub-circuits simultaneously, the problem that the ripple current causing drive current superposition to be formed is large, the infringement that ripple current and ripple circuit cause electronic devices and components such as electric capacity can be reduced, extend the serviceable life of electronic devices and components.
Accompanying drawing explanation
The structural representation of the first light-emitting device that Fig. 1 provides for the embodiment of the present invention;
The first driver' s timing figure that Fig. 2 provides for the embodiment of the present invention;
The structural representation of the second light-emitting device that Fig. 3 provides for the embodiment of the present invention;
The structural representation of the electronic equipment that Fig. 4 provides for the embodiment of the present invention;
The schematic flow sheet of the driving method that Fig. 5 provides for the embodiment of the present invention;
The second driver' s timing figure that Fig. 6 provides for the embodiment of the present invention;
The third driver' s timing figure that Fig. 7 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with Figure of description and specific embodiment technical scheme of the present invention done and further elaborate.
Embodiment one:
As shown in Figure 1, the present embodiment provides a kind of light-emitting device, and described light-emitting device comprises:
At least two-way drive sub-circuits 110; Wherein, described in each road, drive sub-circuits can switch between driving condition and non-driven state; And the time period that any two described drive sub-circuits are in driving condition in a drive cycle mutually stagger;
White light-emitting diodes 120, is connected with described drive sub-circuits 110, under the driving of described drive sub-circuits, carry out luminescence, and the optical fiber usually launched is white light.Here white light-emitting diodes 120 can be the white light-emitting diodes utilizing blue light diode and the effect of yellow silver light powder to be formed, and also can be by the white light-emitting diodes taking formation mixed between other color diodes.In a word, white light-emitting diodes described in the present embodiment is 120 structures comprising light emitting diode, mixes effect or the collocation with miscellaneous part by the light between diode, externally can send the light source of white.Light-emitting device described in the present embodiment can as the display light source of various display, such as, as the display backlight of liquid crystal display, for the electronic equipments such as LCD TV provide display backlight.
In the light-emitting device described in the present embodiment, include the time period that at least two drive sub-circuits 110, two drive sub-circuits 110 are in driving condition in drive cycle staggers mutually.Like this, can be regarded as in a drive cycle and only have part drive sub-circuits to be in driving condition, remaining drive sub-circuits is in non-driven state.Be in the drive sub-circuits of driving condition, provide the electric signal needed for luminescence to white light-emitting diodes 120.Here electric signal comprises voltage and/or current signal.Be in the drive sub-circuits of non-driven state, be not provided for luminous voltage and/or current signal to described white light-emitting diodes 120.
In the circuit shown in Fig. 1, drive sub-circuits 110 comprises 3 tunnels, drive sub-circuits 1, drive sub-circuits 2 and drive sub-circuits 3 respectively, this 3 tunnel drive sub-circuits is all connected with white light-emitting diodes 120, can at any driving condition for white light-emitting diodes 120 luminescence provides driving voltage and/or drive current.Certain son is when specific implementation, and the way of described drive sub-circuits 110 is not limited to 3 tunnels, can be any way on more than 2 tunnels.
Light-emitting device is divided in order to multiple sub-light-emitting device like this, and the time period that this little light-emitting device is in driving condition is the generation just reducing output capacitor and ripple current of staggering, and can extend the serviceable life of electric capacity in light-emitting device.
Embodiment two:
As shown in Figure 1, the present embodiment provides a kind of light-emitting device, and described light-emitting device comprises:
At least two-way drive sub-circuits 110; Wherein, described in each road, drive sub-circuits can switch between driving condition and non-driven state; And the time period that any two described drive sub-circuits are in driving condition in a drive cycle mutually stagger;
White light-emitting diodes 120, is connected with described drive sub-circuits 110, under the driving of described drive sub-circuits, carry out luminescence.
Described in each road, drive sub-circuits 110 is equipped with on-off element;
Described switching elements conductive, driving condition described in described drive sub-circuits 110;
Described on-off element disconnects, and described drive sub-circuits 110 is in the non-driven state beyond described driving condition.
In the present embodiment drive sub-circuits 110 described in each road is all provided with on-off element, on-off element here can be that transistor or triode etc. are various can control according to other control signals the element that drive sub-circuits 110 is turned on or off.Be alternatively: described on-off element is driving power transistor.Structure is simple, working current is little and sensitive feature to adopt driving power transistor to have.Certainly described drive sub-circuits 110 electronic devices and components of driving condition or the switching of non-driven state, more than said structure can be in.Certainly, when specific implementation, also by the working current of drive sub-circuits 110 described in each road of control item, the switching between the driving condition of described drive sub-circuits 110 and non-driven state can be realized.
In a word, the light-emitting device described in the present embodiment, utilizes the switching that on-off element carries out between driving condition and non-driven state, has structure simple and realize easy feature.
Embodiment three:
As shown in Figure 1, the present embodiment provides a kind of light-emitting device, and described light-emitting device comprises:
At least two-way drive sub-circuits 110; Wherein, described in each road, drive sub-circuits can switch between driving condition and non-driven state; And the time period that any two described drive sub-circuits are in driving condition in a drive cycle mutually stagger;
White light-emitting diodes 120, is connected with described drive sub-circuits 110, under the driving of described drive sub-circuits, carry out luminescence.
Described in each road, drive sub-circuits 110 is equipped with on-off element;
Described switching elements conductive, driving condition described in described drive sub-circuits 110;
Described on-off element disconnects, and described drive sub-circuits 110 is in the non-driven state beyond described driving condition.
Described on-off element, described in concrete each road of control, drive sub-circuits 110 is carried out once from described non-driven state to the switching of described driving condition in a described drive cycle.
Described on-off element at least performs and once switches in a drive cycle in the present embodiment, namely described drive sub-circuits 110 have at least in one-period a period of time be in driving condition with one period being in non-driven state, the maintenance driving condition of drive sub-circuits 110 long period can be avoided like this, the phenomenon that the ripple current removal effect caused is bad.
As shown in Figure 2, suppose that light-emitting device comprises 4 tunnel drive sub-circuits, be drive sub-circuits 11 respectively, drive sub-circuits 12, drive sub-circuits 13 and drive sub-circuits 14, described drive cycle is T.In the diagram, each road drive sub-circuits all carries out the switching between a driving condition to non-driven state in drive cycle.Horizontal axis representing time axle in fig. 2, longitudinally represents drive singal.When logic level is high level in fig. 2, represents that corresponding drive sub-circuits is in driving condition output drive signal, otherwise be in non-driven state, not output drive signal.Here drive singal can comprise driving voltage and/or drive current.In fig. 2, each time only once drive sub-circuits 110 be in driving condition.In obvious light-emitting device, the amplitude of variation of output drive signal equals the amplitude of variation of maximum drive signal in drive sub-circuits each time.The amplitude of variation of the drive singal of each road drive sub-circuits is all equal in fig. 2, then the amplitude of variation of the drive singal of this light-emitting device equals the amplitude of variation of the drive singal of single drive sub-circuits; And the amplitude of variation that can not produce the drive singal of light-emitting device equals the amplitude of variation sum of the drive singal of each road drive sub-circuits, thus minimizing ripple current, decrease the infringement of ripple current to electronic devices and components, extend electronic devices and components, the serviceable life of such as electric capacity.
Embodiment four:
As shown in Figure 1, the present embodiment provides a kind of light-emitting device, and described light-emitting device comprises:
At least two-way drive sub-circuits 110; Wherein, described in each road, drive sub-circuits can switch between driving condition and non-driven state; And the time period that any two described drive sub-circuits are in driving condition in a drive cycle mutually stagger;
White light-emitting diodes 120, is connected with described drive sub-circuits 110, under the driving of described drive sub-circuits, carry out luminescence.
As shown in Figure 3, described light-emitting device also comprises driving governor 130;
Described driving governor 130 is connected with drive sub-circuits described in each road, for controlling according to the duration of driving work period the duration that described drive sub-circuits 110 is in described driving condition in each described drive cycle.
By the setting of driving governor 130 in the present embodiment, automatically according to the duration of drive cycle, can determine that each road drive sub-circuits is in the duration of driving condition.In each drive cycle, described drive sub-circuits 110 must be in driving condition for some time.Usually described in each road, the running parameter of drive sub-circuits is all identical, such as, comprise identical driving element, export same drive singal etc.Preferably make this time the driving duration of drive sub-circuits 110 described in each road equal.Such as, described light-emitting device comprises N road drive sub-circuits, and the duration of described drive cycle is t, and according to dividing equally described driving duration, then the duration that drive sub-circuits described in each road is in drive cycle can be M*t/N.Here N be not less than 2 integer, described M can be the luminescence ratio of described white light-emitting diodes in a light period.Such as, in fig. 2, described M can be 50% etc.Under general status, described light period equals described drive cycle, and the usual beginning and ending time is also equal.
Certainly, when specific implementation, described driving governor 130 also can be used for, according to driving strategy, determining to realize the control to drive sub-circuits by the number of times that drive sub-circuits described in each road switches in a drive cycle between driving condition and non-driven state.Be chosen as described drive sub-circuits 110 in one-period in the present embodiment and carry out the change to the non-driven cycle of drive cycle; thus the minimizing drive sub-circuits 110 of trying one's best is to the switching between conducting and closedown; each electronic devices and components in the protection drive sub-circuits of having followed, extend the serviceable life of drive sub-circuits 110.
Embodiment five:
As shown in Figure 4, the present embodiment provides a kind of electronic equipment, described electronic equipment comprise display module 210 and as embodiment one to embodiment four provide as described in light-emitting device 220.Light-emitting device 220 described in the present embodiment can light-emitting device as shown in Fig. 1 or Fig. 3.Here described light-emitting device 220 is for providing display light source for described display module 210.Here display module 220 can be passive display module, needs the display module being provided display light source by the external world.Such as, described display module can be liquid crystal display module, or electric ink display module etc.
Electronic equipment described in the present embodiment, the feature of the little and long service life of ripple current that light-emitting device 210 produces.
Embodiment six:
As shown in Figure 5, the present embodiment provides a kind of driving method, and described method comprises:
Step S110: utilize different driving electronic circuit to interlock for white light-emitting diodes provides driving at drive cycle;
Step S120: described white light-emitting diodes is luminous under the driving of described drive sub-circuits.
By utilizing, different drive sub-circuits of giving is staggered in drive cycle provides driving for white light-emitting diodes in the present embodiment, and providing here drives as providing drive singal.Here drive singal at least comprise drive current and driving voltage at least one of them.
White light-emitting diodes described in step S120 is luminous under the driving of drive sub-circuits, and the last sent light of white light-emitting diodes is white light here.
Profit provides driving for white light-emitting diodes in this way, can reduce the ripple current produced in driving process, reduces ripple current to the infringement of the electronic components such as electric capacity, extends the serviceable life of electronic devices and components.
When specific implementation, described driving method can be provides light fixture to provide light source, such as, and room lighting.Driving method described in certain the present embodiment also can be some display units and provides display light source, and now, described method also comprises: utilize the luminescence of described white light-emitting diodes to provide display light source for showing module.Here display module can be various types of passive display module, needs to provide display light source by equipment such as white light-emitting diodess.This display module can be liquid crystal display module or electric ink display module etc.When electric ink display module when night without surround lighting, can by the driving method described in the present embodiment, the white light-emitting diodes driving electronic reader etc. inner is luminous, provides electric ink to show the display light source of module.
Embodiment seven:
As shown in Figure 5, the present embodiment provides a kind of driving method, and described method comprises:
Step S110: utilize different driving electronic circuit to interlock for white light-emitting diodes provides driving at drive cycle;
Step S120: described white light-emitting diodes is luminous under the driving of described drive sub-circuits.
Described step S110 can comprise:
Control to provide the drive sub-circuits of driving to switch driving condition from non-driven state for white light-emitting diodes;
The drive sub-circuits being in driving condition provides driving for described white light-emitting diodes.
When drive sub-circuits needs to provide driving in the present embodiment, corresponding drive sub-circuits needs to be switched to driving condition from non-driven state, by drive sub-circuits corresponding to conducting or the mode providing operating voltage or working current to the drive sub-circuits of correspondence, the switching of drive sub-circuits from non-driven state to driving condition can be realized in the present embodiment.By the drive sub-circuits being in driving condition for white light diode provides driving.
Embodiment eight:
As shown in Figure 5, the present embodiment provides a kind of driving method, and described method comprises:
Step S110: utilize different driving electronic circuit to interlock for white light-emitting diodes provides driving at drive cycle;
Step S120: described white light-emitting diodes is luminous under the driving of described drive sub-circuits.
The present embodiment is the further improvement of any one technical scheme provided based on aforementioned two embodiments,
Described method also comprises:
According to described drive cycle, determine the duration maintaining described driving condition of drive sub-circuits described in each;
Based on described duration, control the switching of drive sub-circuits between described driving condition and described non-driven state described in each road.
To determine that according to drive cycle each drive sub-circuits is in the duration of driving condition in the present embodiment, like this, how just can be clear and definite know controls the conducting of drive sub-circuits and the time of disconnection, have and realize easy feature.Such as, utilize the driving governor in light-emitting device described in Fig. 3 to determine the driving duration of each road drive sub-circuits.
In a word, driving method described in the present embodiment, utilizes different driving electronic circuit to interlock for white light-emitting diodes provides driving, provides so simultaneously drive the electric current caused to add up relative to drive sub-circuits, the ripple circuit produced is little, the serviceable life of the electronic equipment of prolongation.
A concrete example is provided below in conjunction with above-mentioned any embodiment.Comprise 5 drive sub-circuits at the present embodiment light-emitting device, these 5 drive sub-circuits only have a drive sub-circuits to be in driving condition output driving current a moment.Driver' s timing figure shown in Fig. 6 and Fig. 7, can be the sequential chart of drive current under different ratio of pulse length to the total cycle length in light-emitting device described in this example.I1 represents that the drive current that the 1st drive sub-circuits exports, i2 represent that the drive current that the 2nd drive sub-circuits exports, i3 represent that the drive current that the 3rd drive sub-circuits exports, i4 represent the drive current that the 4th drive sub-circuits exports.Idc in Fig. 6 and Fig. 7 is total drive current that light-emitting device exports to white light-emitting diodes.
A pulse width of drive current accounts for whole drive cycle (1/2) * (1*5)=1/10 in figure 6; The drive current of such formation idc as shown in Figure 6, only has the time of half to have drive current.
In the figure 7 drive current a whole drive cycle in pulse width station 1/5, like this formed idc drive current as shown in Figure 6, drive current is not 0 always and remains unchanged.
T1, T2, T3, T4, T5, T6, T7, T8, T9, T10 in Fig. 6 to Fig. 7, a corresponding driven element cycle.Obviously a drive cycle comprises 5 driven element cycles in figure 6, and within each driven element cycle, the curent change of the idc shown in Fig. 6 once.In the figure 7, a drive cycle comprises 5 driven element cycles equally, but in each driven element cycle, idc does not change.
In several embodiments that the application provides, should be understood that disclosed equipment and method can realize by another way.Apparatus embodiments described above is only schematic, such as, the division of described unit, be only a kind of logic function to divide, actual can have other dividing mode when realizing, and as: multiple unit or assembly can be in conjunction with, maybe can be integrated into another system, or some features can be ignored, or do not perform.In addition, the coupling each other of shown or discussed each ingredient or direct-coupling or communication connection can be by some interfaces, and the indirect coupling of equipment or unit or communication connection can be electrical, machinery or other form.
The above-mentioned unit illustrated as separating component or can may not be and physically separates, and the parts as unit display can be or may not be physical location, namely can be positioned at a place, also can be distributed in multiple network element; Part or all of unit wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.
In addition, each functional unit in various embodiments of the present invention can all be integrated in a processing module, also can be each unit individually as a unit, also can two or more unit in a unit integrated; Above-mentioned integrated unit both can adopt the form of hardware to realize, and the form that hardware also can be adopted to add SFU software functional unit realizes.
One of ordinary skill in the art will appreciate that: all or part of step realizing said method embodiment can have been come by the hardware that programmed instruction is relevant, aforesaid program can be stored in a computer read/write memory medium, this program, when performing, performs the step comprising said method embodiment; And aforesaid storage medium comprises: movable storage device, ROM (read-only memory) (ROM, Read-OnlyMemory), random access memory (RAM, RandomAccessMemory), magnetic disc or CD etc. various can be program code stored medium.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.
Claims (10)
1. a light-emitting device, described light-emitting device comprises:
At least two-way drive sub-circuits; Wherein, described in each road, drive sub-circuits can switch between driving condition and non-driven state; And the time period that any two described drive sub-circuits are in driving condition in a drive cycle mutually stagger;
White light-emitting diodes, is connected with described drive sub-circuits, under the driving of described drive sub-circuits, carry out luminescence.
2. light-emitting device according to claim 1, is characterized in that,
Drive sub-circuits described in each road is provided with on-off element;
Described switching elements conductive, described drive sub-circuits is in described driving condition;
Described on-off element disconnects, and described drive sub-circuits is in the non-driven state beyond described driving condition.
3. light-emitting device according to claim 2, is characterized in that,
Described on-off element is driving power transistor.
4. the light-emitting device according to Claims 2 or 3, is characterized in that,
Described on-off element, described in concrete each road of control, drive sub-circuits is carried out once from described non-driven state to the switching of described driving condition in a described drive cycle.
5. the light-emitting device according to claim 1,2 or 3, is characterized in that,
Described light-emitting device also comprises driving governor;
Described driving governor is connected with drive sub-circuits described in each road, for controlling according to the duration of driving work period the duration that described drive sub-circuits is in described driving condition in each described drive cycle.
6. an electronic equipment, is characterized in that,
Described electronic equipment comprises display module and light-emitting device as described in any one of claim 1 to 5;
Described light-emitting device is used for providing display light source for described display module.
7. a driving method, described method comprises:
Different driving electronic circuit is utilized to interlock for white light-emitting diodes provides driving at drive cycle;
Described white light-emitting diodes is luminous under the driving of described drive sub-circuits.
8. method according to claim 7, is characterized in that,
Describedly utilize different driving electronic circuit interlocking for white light-emitting diodes provides driving at drive cycle, comprising:
Control to provide the drive sub-circuits of driving to switch driving condition from non-driven state for white light-emitting diodes;
The drive sub-circuits being in driving condition provides driving for described white light-emitting diodes.
9. the method according to claim 7 or 8, is characterized in that,
Described method also comprises:
According to described drive cycle, determine the duration maintaining described driving condition of drive sub-circuits described in each;
Based on described duration, control the switching of drive sub-circuits between described driving condition and described non-driven state described in each road.
10. the method according to claim 7 or 8, is characterized in that,
Described method also comprises:
The luminescence of described white light-emitting diodes is utilized to provide display light source for showing module.
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